Journal articles on the topic 'Vibration damping, energy harvesting, shock absorber'
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1
Wu, Zhifei, and Guangzhao Xu. "Modeling and Analysis of a Hydraulic Energy-Harvesting Shock Absorber." Mathematical Problems in Engineering 2020 (February 8, 2020): 1–11. http://dx.doi.org/10.1155/2020/1580297.
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This paper proposes a hydraulic energy-harvesting shock absorber prototype, which realizes energy harvesting of the vibration energy dissipated by the automobile suspension system. The structural design of the proposed shock absorber ensures that the unidirectional flow of oil drives the hydraulic motor to generate electricity while obtaining an asymmetrical extension/compression damping force. A mathematical model of the energy-harvesting shock absorber is established, and the simulation results indicate that the damping force can be controlled by varying the load resistance of the feed module, thus adjusting the required damping force ratio of the compression and recovery strokes. By adjusting the external load, the target indicator performance of the shock absorber is achieved while obtaining the required energy recovery power. A series of experiments are conducted on the prototype to verify the validity of the damping characteristics and the energy recovery efficiency as well as to analyze the effect of external load and excitation speed on these characteristics.
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Li, Jing, Peiben Wang, Yuewen Gao, Dong Guan, and Shengquan Li. "Quantitative Power Flow Characterization of Energy Harvesting Shock Absorbers by Considering Motion Bifurcation." Energies 15, no. 19 (September 20, 2022): 6887. http://dx.doi.org/10.3390/en15196887.
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Vibration energy harvesting technology can capture ambient energy forms. Using an energy harvesting shock absorber (EHSA) is one of the methods to achieve this function. The EHSA with mechanical motion rectifier (MMR) has motion bifurcation, which can improve energy harvesting performance and reduce the impact between gears. However, the motion bifurcation makes it difficult to quantitatively predict the vibrational energy dissipation and energy harvesting of the MMR−EHSA. Evaluating the performance of an MMR−EHSA during the design phase becomes highly complex. In this paper, a novel nonlinear dynamics model of MMR−EHSAs is established to solve motion bifurcation and quantitative power flow. Furthermore, the proposed MMR−EHSA prototype is fabricated, and dynamics testing is initiated to verify the theoretical model under harmonic vibration. The testing results show that the theoretical model can predict the working characterization of MMR−EHSAs. The resistance of optimal harvesting energy and maximum damping power is revealed by the quantitative power flow model under harmonic vibration. In addition, the working performance under random vibration is discussed. The proposed nonlinear dynamics model has advantages when solving random vibration input and has potential for practical application.
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Lee, Jinkyu, Yondo Chun, Jiwon Kim, and Byounggun Park. "An Energy-Harvesting System Using MPPT at Shock Absorber for Electric Vehicles." Energies 14, no. 9 (April 29, 2021): 2552. http://dx.doi.org/10.3390/en14092552.
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This paper investigates an energy-harvesting system that uses of vibration energy at a shock absorber for electric vehicles. This system mainly comprises a linear electromagnetic generator and synchronous buck converter. To obtain the electrical energy through a linear electromagnetic generator, the perturb and observe maximum power point tracking (P&O MPPT) scheme is applied at the converter. The power converter circuit is designed with a diode rectifier and synchronous buck converter. The generated electric power is able to transmit to the battery and the damping force of the shock absorber is adjusted by the controlled current of generator. The linear electromagnetic generator was designed as a single phase eight-slot eight-pole tubular permanent magnet machine. The performance of the proposed energy-harvesting system was verified through simulations and experiments.
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Li, Peng, and Lei Zuo. "Influences of the electromagnetic regenerative dampers on the vehicle suspension performance." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 3 (August 5, 2016): 383–94. http://dx.doi.org/10.1177/0954407016639503.
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Conventional vehicle suspensions suppress vehicle vibrations by dissipating the vibration energy into unrecyclable heat with hydraulic dampers. This can be a considerable amount of energy which is worthy of attention for energy recovery. Electromagnetic regenerative dampers, or shock absorbers, are proposed to harvest this dissipated energy and to improve the fuel efficiency. The suspension dynamics with these regenerative dampers can be significantly different from the suspension dynamics with conventional dampers. First, different from conventional hydraulic dampers, the electromagnetic regenerative dampers have a significantly higher inertia, which is introduced by the electromagnetic generator. This has an important impact on the suspension dynamics. Second, the damping coefficient of electromagnetic dampers is related to the electric load connected to the output of the generator and can be controllable. Although various concepts have been proposed, the influences of these types of regenerative damper on the vehicle dynamics have not yet been thoroughly investigated. This paper models two types of rotational electromagnetic regenerative damper, with and without a mechanical motion rectifier, and analyzes their influences on the vehicle suspension performance in comparison with those of the conventional damper. The modeling in this paper also considers the case when the tires lose contact with the ground. Simulations were carried out with step road profile excitations and road profile excitations defined by the International Standardization Organization in order to evaluate the influences of the equivalent inertia mass and the equivalent damping coefficient. The results showed that, with an optimized equivalent inertia mass, both types of electromagnetic damper can achieve better ride comfort performances than a constant damper does. In addition, the mechanical motion rectifier mechanism can significantly improve the ride comfort and the road-handling performance of electromagnetic regenerative dampers by reducing the negative effect of the amplified generator inertia. In addition, the energy-harvesting potential of the presented dampers under road profile excitations defined by the International Standardization Organization was evaluated.
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Chen, Wei Wu, and Zu Tao Zhang. "Energy Harvesting Shock Absorbers for Vehicles: Design, Modeling and Simulation." Applied Mechanics and Materials 672-674 (October 2014): 1169–74. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1169.
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Energy harvesting shock absorber is used for harvesting the kinetic energy in the vehicle suspension vibration. In this paper, we present design, modeling, and simulation of a novel energy harvesting shock absorber based on rack and pinion mechanism. The shock absorber consists of three main components: the mechanical vibration input, the transmission module, and the micro-generator module. The shock absorber is installed between the vehicle frame and chassis to obtain a relative linear motion acting as mechanical vibration input. The function of transmission mechanism module is to convert the relative linear motion to a unidirectional rotation for the input shaft of micro-generator. The micro-generator will produce electricity due to the input shaft rotating in one direction. This shock absorber was tested in simulation condition, and the last performance evaluation demonstrates the validity of the proposed energy harvesting shock absorber.
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Yuan, Miao, Youzuo Jin, Kefu Liu, and Ayan Sadhu. "Optimization of a Non-Traditional Vibration Absorber for Vibration Suppression and Energy Harvesting." Vibration 5, no. 3 (June 22, 2022): 383–407. http://dx.doi.org/10.3390/vibration5030022.
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This paper investigates the optimization of a non-traditional vibration absorber for simultaneous vibration suppression and energy harvesting. Unlike a traditional vibration absorber, the non-traditional vibration absorber has its damper connected between the absorber mass and the base. An electromagnetic energy harvester is used as a tunable absorber damper. This non-traditional vibration absorber is attached to a primary system that is subjected to random base excitation. An analytical study is conducted by assuming that the base excitation is white noise. In terms of vibration suppression, the objective of the optimization is to minimize the power dissipated by the primary damper and maximize the power dissipated by the absorber damper. It is found that when the primary system is undamped, the power dissipated by the absorber damper remains a constant that is related to the mass ratio. The higher the mass ratio, the higher the power dissipated. When the primary system is damped, the minimization of the power dissipated by the primary damping is equivalent to the maximization of the power dissipated by the absorber damper. The existence of the optimum solutions depends on both the mass ratio and the primary damping ratio. In terms of energy harvesting, the objective of optimization is to maximize the power harvested by the load resistor. It is found that for a given mass ratio and primary damping ratio, the optimum frequency tuning ratio required to maximize vibration suppression is slightly higher than that required to maximize the harvested power. The trade-off issue between vibration suppression and energy harvesting is investigated. An apparatus is developed to allow frequency tuning and damping tuning. Both the numerical simulation and experimental study with band-limited white noise validate the general trends revealed in the analytical study.
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Satpute, N. V., S. Singh, and S. M. Sawant. "Energy Harvesting Shock Absorber with Electromagnetic and Fluid Damping." Advances in Mechanical Engineering 6 (February 12, 2015): 693592. http://dx.doi.org/10.1155/2014/693592.
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Yuan, Miao, and Kefu Liu. "Vibration Suppression and Energy Harvesting with a Non-traditional Vibration Absorber: Transient Responses." Vibration 1, no. 1 (August 10, 2018): 105–22. http://dx.doi.org/10.3390/vibration1010009.
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This paper focuses on vibration suppression and energy harvesting using a non-traditional vibration absorber referred to as model B. Unlike the traditional vibration absorber, model B has its damper connected between the absorber mass and ground. The apparatus used in the study consists of a cantilever beam attached by a mass at its free end and an electromagnetic energy harvester. The frequency tuning is achieved by varying the beam length while the damping tuning is realized by varying the harvester load resistance. The question addressed is how to achieve the best performance under transient responses. The optimum tuning condition for vibration suppression is based on the Stability Maximization Criterion (SMC). The performance of energy harvesting is measured by the percentage of the harvested energy to the input energy. A computer simulation is conducted. The results validate the optimum parameters derived by the SMC. There is a trade-off between vibration suppression and energy harvesting within the realistic ranges of the frequency tuning ratio and damping ratio. A multi-objective optimization is conducted. The results provide a guideline for obtaining a balanced performance. An experimental study is carried out. The results verify the main findings from the computer simulation. This study shows that the developed apparatus is capable of achieving simultaneous vibration suppression and energy harvesting under transient responses.
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Kim, Tae Dong, and Jin Ho Kim. "Shock-Absorber Rotary Generator for Automotive Vibration Energy Harvesting." Applied Sciences 10, no. 18 (September 21, 2020): 6599. http://dx.doi.org/10.3390/app10186599.
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The vibration energy derived from vehicle movement over a road surface was first converted to rotational energy during vehicle operation by installing blades in the suspension system. The rotational energy was converted to electrical energy using the rotational energy as the input value of the rotary generator. The vibrations from the road’s surface were analyzed using CarSim-Simulink. The blades’ characteristics were analyzed using ANSYS Fluent. The T–ω curve was derived, and the power generation of the rotary generator was verified using the commercial electromagnetic analysis program, ANSYS MAXWELL. For high power generation, the design was optimized using PIAnO (process integration, automation, and optimization), a PIDO (process integration and design optimization) tool. The amount of power generation was 59.4562 W, which was a 122.47% increase compared to the initial model. The remaining problems were analyzed, and further studies were performed. This paper proposes the applicability and development direction of suspension with energy harvesting by installing blades on suspension.
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Guntur, Harus Laksana, and Wiwiek Hendrowati. "A Comparative Study of the Damping Force and Energy Absorbtion Capacity of Regenerative and Conventional-Viscous Shock Absorber of Vehicle Suspension." Applied Mechanics and Materials 758 (April 2015): 45–50. http://dx.doi.org/10.4028/www.scientific.net/amm.758.45.
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This paper presents a comparative study of the damping force and energy absorbtion capacity of a typical conventional-viscous and a regenerative shock absorber for vehicle suspension. Regenerative shock absorber (RSA) is a shock absorber which can regenerate the dissipated vibration energy from vehicle suspension into electricity. In this research, a prototype of regenerative shock absorber was developed, its damping force and energy absorbtion capacity were tested, and the results were analized and compared with those of a typical conventional-viscous shock absorber. The regenerative and viscous shock absorber were compressed and extended in various excitation frequency using damping force testing equipment to obtain force-velocity and the force-displacement curves. The force-velocity and force-displacement curves indicate the damping force and energy absorbtion capacity of the shock absorber. The results show that the damping force of the typical-viscous shock absorber closed to linear at all exciation frequencies. For regenerative shock absorber, nonlinearity and large hysteresis area of the damping force occur at all excitation frequencies. Further, the energy absorbtion capacity of the typical-viscous shock absorber shows an elliptical area with the compression part bigger than the extension one, while those of the regenerative shock absorber shows an asymmetric square area, which indicates a smaller energy absorbtion capacity. These phenomena indicate the significant effect of implementing dry friction damper and elctrical damper to the characteristics of regenerative shock absorber.
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Jiao, Fujun. "Oil damping energy loss analysis of landing gear shock absorber." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 8 (August 14, 2018): 3096–106. http://dx.doi.org/10.1177/0954410018793788.
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It is seen that previous research on falling vibration of landing gear only provides work–stroke diagram and damping force value. Nevertheless, the change process of buffering medium at a micro-level is yet to be analyzed. The velocity, pressure, and their change over time of fluid particle are rarely researched in reality. To improve the intuitive, concreteness, and accuracy of the falling vibration analysis, this paper uses theoretical calculation and simulation to analyze oil damping energy loss of shock absorber. On the basis of theoretical calculation, the paper provides a feasible solution for calculating oil damping energy loss in the drop test of landing gear. Based on the classical fluid mechanics, the research builds a series-parallel model for calculating oil damping coefficient, and the oil damping energy loss values are calculated. To the flow passage type with one inlet and two outlets, the best solution of volume flow rate weighting of two outlets is determined. With regard to simulation, ANSYS FLUENT is used to show the dynamic flow process of oil in damping orifice. Damping energy loss values are calculated by total pressure difference. By comparison, the results of the theoretical calculation, the simulation, and the drop test achieve a good consistency.
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Kabariya, Urvesh, and Sagil James. "Study on an Energy-Harvesting Magnetorheological Damper System in Parallel Configuration for Lightweight Battery-Operated Automobiles." Vibration 3, no. 3 (July 1, 2020): 162–73. http://dx.doi.org/10.3390/vibration3030013.
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Suspension dampers are extremely critical for modern automobiles for absorbing vibrational energy while in operation. For years now, the viscous passive damper has been dominant. However, there is a constant need to improve and revolutionize the damping technology to adapt to modern road conditions and for better performance. Controlled shock absorbers capable of adapting to uneven road profiles are required to meet this challenge and enhance the passenger comfort level. Among the many types of modern damping solutions, magnetorheological (MR) dampers have gained prominence, considering their damping force control capability, fast adjustable response, and low energy consumption. Advancements in energy-harvesting technologies allow for the regeneration of a portion of energy dissipated in automotive dampers. While the amount of regenerated energy is often insufficient for regular automobiles, it could prove to be vital to support lightweight battery-operated vehicles. In battery-operated vehicles, this regenerated energy can be used for powering several secondary systems, including lighting, heating, air conditioning, and so on. This research focuses on developing a hybrid smart suspension system that combines the MR damping technology along with an electromagnetic induction (EMI)-based energy-harvesting system for applications in lightweight battery-operated vehicles. The research involves the extensive designing, numerical simulation, fabrication, and testing of the proposed smart suspension system. The development of the proposed damping system would help advance the harvesting of clean energy and enhance the performance and affordability of future battery-operated vehicles.
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Zhang, Cheng Cai, Zhe Xiong, Zhi Gang Fang, and Xue Xun Guo. "The Operating Principle and Experimental Verification of the Hydraulic Electromagnetic Energy-Regenerative Shock Absorber." Advanced Materials Research 655-657 (January 2013): 1175–78. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1175.
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This paper introduces a new type of shock absorber: hydraulic electromagnetic energy-regenerative shock absorber (HESA), which can simultaneously implement the function of damping vibration and regenerating a portion of dissipated energies generated from passing through the damping hole. A test bench was trial-produced and used to prove the feasibility of the energy-regenerative scheme. The situation that hydraulic motor rotational speed has a sudden change in the energy regenerating process is theoretically analyzed.
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Yang, Han Song, Peng Li, Li Zhi Gu, and Hui Juan Guo. "A Kind of Active Control Damping Shock Absorber." Key Engineering Materials 620 (August 2014): 511–15. http://dx.doi.org/10.4028/www.scientific.net/kem.620.511.
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It is the main decrease press type used in high speed train of semi suspension system, as the parameter can not be regulated freely of the semi suspension system, to design a kind of damping shock absorber which with the sensitive and soft system are very important, this system which using of the Electro hydraulic proportional valve to regulation the safety valve, the guide valve and the damping force of shock absorber, get the recycle method of the hydraulic system from inner to outside, and also using the suspension active control variable damping shock absorber to detect the road, this device, in fact, by vibration, which let the valve move relation, turn the mechanical energy into hot and release outside, thus decrease the vibration. To design this variable damping shock absorber ,compared with the semi suspension system ,for it has the connect system and Electro hydraulic proportional valve, and with the road detectors, and various variable parameters, Which let the high speed train more stable and safety, overcome the short of parameter regulation for the semi-automatic suspension system.
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Gijón-Rivera, Carlos, and José Luis Olazagoitia. "Methodology for Comprehensive Comparison of Energy Harvesting Shock Absorber Systems." Energies 13, no. 22 (November 21, 2020): 6110. http://dx.doi.org/10.3390/en13226110.
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In recent years, there has been a lot of work related to Energy Harvesting Shock Absorbers (EHSA). These devices harvest energy from the movement of the vehicle’s shock absorbers caused by road roughness, braking, acceleration and turning. There are different technologies that can be used in these systems, but it is not clear which would be the best option if you want to replace a conventional shock absorber with an EHSA. This article presents a methodology to compare the performance of different EHSA technologies that can replace a shock absorber with a given damping coefficient. The methodology allows to include different analysis options, including different types of driving cycles, computer vehicle models, input signals and road types. The article tests the methodology in selecting the optimal EHSA technology for a particular shock absorber and vehicle, optimizing at the same time energy recovery. In addition, a study of parameters in each type of technology is included to analyze its influence on the final objective. In the example analyzed, the EHSA technology with a rack and pinion system turned out to be the best. The proposed methodology can be extrapolated to other case studies and design objectives.
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Li, Shiying, Jun Xu, Xiaohui Pu, Tao Tao, and Xuesong Mei. "A novel design of a damping failure free energy-harvesting shock absorber system." Mechanical Systems and Signal Processing 132 (October 2019): 640–53. http://dx.doi.org/10.1016/j.ymssp.2019.07.004.
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Singh, Shankar, and Nitin Vijay Satpute. "Design and analysis of energy-harvesting shock absorber with electromagnetic and fluid damping." Journal of Mechanical Science and Technology 29, no. 4 (April 2015): 1591–605. http://dx.doi.org/10.1007/s12206-015-0331-7.
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Satpute, Nitin V., Sarika N. Satpute, and Lalitkumar M. Jugulkar. "Hybrid electromagnetic shock absorber for energy harvesting in a vehicle suspension." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 8 (August 17, 2016): 1500–1517. http://dx.doi.org/10.1177/0954406216663577.
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Electromagnetic harvesters need to be designed with a mechanism to amplify the coil relative velocity to ensure compact size and lower weight. This paper discusses a novel technique to use fluid link for velocity amplification in an electromagnetic shock absorber. Incorporation of the fluid amplification significantly improves harvested power, without affecting the system dynamics. Numerical modelling and experimentation of a prototype shock absorber comprising of high energy rare earth magnets have been presented. Peak coil voltage of 0.60–24.2 V was recorded during experimentation on the prototype. Experimental and simulation results validate that incorporation of the fluid amplification link improves the harvested electric power by 9702%. Comprehensive design procedure for better harvesting efficiency and vibration isolation has been discussed. Lastly incorporation of the shock absorber in McPherson strut suspension is illustrated. The real size version will be able to harvest peak power of 18–227 W for the suspension velocities of 0.15–0.4 m/s.
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Xie, Fangwei, Jinxin Cao, Erming Ding, Kuaidi Wan, Xinshi Yu, Jun Ke, and Kuidong Gao. "Temperature rise characteristics of the valve-controlled adjustable damping shock absorber." Mechanics & Industry 21, no. 1 (2020): 111. http://dx.doi.org/10.1051/meca/2019084.
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The thermodynamic study of the valve-controlled adjustable damping shock absorber is conducted in order to solve the problem of oil leakage caused by excessive temperature rise of shock absorber. In this paper, the temperature rise of the valve-controlled adjustable damping shock absorber is analyzed from the perspective of energy conservation. Combined with the theory of fluid mechanics, the damping heat model is established, and the heat dissipation model of the shock absorber is established based on heat convection, heat conduction and heat radiation. The corresponding thermal equilibrium equation is established on the basis of damping heat and heat dissipation. The effects of vibration velocity, outer diameter, thickness and length of reservoir cylinder, and wind velocity on its thermal performance have been investigated. Specifically, temperature after thermal equilibrium will grow with the increase of vibration velocity and thickness of reservoir cylinder and degrade with the increase of outer diameter, length of reservoir cylinder and wind velocity. The higher the balance temperature, the shorter time is required to arrive thermal equilibrium. The difference between the experimental and simulation values of oil temperature after thermal equilibrium was not more than 2 °C, which verified the correctness of the theoretical model, while the experimental value in the process of temperature rise lagged behind the simulation value, which was mainly caused by the cumulative error of step-by-step iteration and the mechanical hysteresis in the experiment. The conclusions obtained can provide some references for the design of shock absorbers.
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Alhumaid, Saleh, Daniel Hess, and Rasim Guldiken. "A Noncontact Magneto–Piezo Harvester-Based Vehicle Regenerative Suspension System: An Experimental Study." Energies 15, no. 12 (June 20, 2022): 4476. http://dx.doi.org/10.3390/en15124476.
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Recent research has examined the possibility of recovering energy from mechanical vibration induced by a vehicle shock absorber using piezoelectric and electromagnetic transducers. In terms of automotive applications, piezoelectric vibration energy harvesting shows promise for recapturing some (even if small) amounts of vehicle vibration energy, which would otherwise be wasted through the vehicle dampers. Functional materials, such as piezoelectric materials, are capable of converting mechanical energy into useful electrical energy and vice versa. In this paper, an innovative rotational piezoelectric vibration-energy-harvesting device is presented that employs a magnetic coupling mechanism and provides robust performance over a range of frequencies. The piezoelectric energy harvester is driven by a unidirectional suspension system. An experimental investigation was carried out to study the performance of the manufactured prototype. We observed no damage to the prototype after operating continuously at a vibration amplitude of 5 mm at a frequency of 2.5 Hz for over 10,000 cycles. In addition, the presented regenerative suspension system is capable of producing high and relatively steady open-circuit voltages, irrespective of excitation frequencies. The results demonstrate that regenerative shock absorber is robust and has a broad frequency range.
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Shatskyi, Ivan, and Andrii Velychkovych. "Analytical Model of Structural Damping in Friction Module of Shell Shock Absorber Connected to Spring." Shock and Vibration 2023 (March 4, 2023): 1–17. http://dx.doi.org/10.1155/2023/4140583.
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Vibration processes play a significant role in the modern industry. In most cases, vibration reduces strength, reliability, and durability of industrial machines, mechanisms, and structures, as well as adversely affects the health of support staff. This study presents a new dry friction shell shock absorber design. The shock absorber contains two spring sections and a friction module with an open shell and an elastic filler; at the same time, the spring sections and the friction module work in parallel. The proposed device demonstrates good damping characteristics, capable of operating under high operating loads, and at the same time has compact transverse dimensions. With a nonmonotonic loading of such a shock absorber, due to the contact interaction of the filler with an open shell, part of the energy that is supplied to the system will be dissipated. In other words, in response to the action of an external nonmonotonic loading, the phenomenon of structural hysteresis occurs in the friction module of the shock absorber. To describe the deformation of the shock absorber, a mechanical and mathematical model of a shell with a cut along the generatrix, which is the main bearing link, has been developed. By means of the technique of quasistatic analysis of structural damping in nonmobile nonconservative shell systems with a deformable filler, the hysteresis loops of the presented shock absorber are analytically described. Using them, according to the known loading history, it is possible to predict the behavior of the considered nonconservative system at any time after the start of the loading process. At each stage of the cyclic loading, the distribution of stresses and relationships between the external loading and the piston displacement was studied. Inequalities are obtained for permissible loads under which the operation of the shock absorber is safe. Such shell shock absorbers are projected to be used in the mining, oil and gas, and construction industries.
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Zou, Junyi, Xuexun Guo, Lin Xu, Gangfeng Tan, Chengcai Zhang, and Jie Zhang. "Design, Modeling, and Analysis of a Novel Hydraulic Energy-Regenerative Shock Absorber for Vehicle Suspension." Shock and Vibration 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/3186584.
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To reduce energy consumption or improve energy efficiency, the regenerative devices recently have drawn the public’s eyes. In this paper, a novel hydraulic energy-regenerative shock absorber (HERSA) is developed for vehicle suspension to regenerate the vibration energy which is dissipated by conventional viscous dampers into heat waste. At first, the schematic of HERSA is presented and a mathematic model is developed to describe the characteristic of HERSA. Then the parametric sensitivity analysis of the vibration energy is expounded, and the ranking of their influences is k1≫m2>m1>k2≈cs. Besides, a parametric study of HERSA is adopted to research the influences of the key parameters on the characteristic of HERSA. Moreover, an optimization of HERSA is carried out to regenerate more power as far as possible without devitalizing the damping characteristic. To make the optimization results more close to the actual condition, the displacement data of the shock absorber in the road test is selected as the excitation in the optimization. The results show that the RMS of regenerated energy is up to 107.94 W under the actual excitation. Moreover it indicates that the HERSA can improve its performance through the damping control.
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Velichkovich, Andrii, Taras Dalyak, and Ivan Petryk. "Slotted shell resilient elements for drilling shock absorbers." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 73 (2018): 34. http://dx.doi.org/10.2516/ogst/2018043.
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The new design of a resilient element for application in drilling devices of vibration protection is presented. A cylindrical shell with a cut along its generatrix is the peculiarity of the proposed design. The presented resilient element has high loaded and damping properties upon cross dimension hard restriction condition. Besides, the design is simple, technological and low cost. The drilling shock absorber is tested, which is manufactured on the base of several slotted shell resilient elements, operating in parallel manner. A calculation method for slotted shell resilient elements for drilling devices vibration protection is given. This work presents results of slotted cylindrical shell study in conditions of contact interaction with a resilient filler. To provide the research, the authors have developed a verified numerical model of the shell resilient element with a slit and used iterative algorithms for contact problem solving, considering contact surface friction. The stress-strain state of the shell resilient element of the drilling shock absorber was analyzed. Strength of the structure is evaluated by the energy criterion. Hysteresis loops were developed and analyzed for some histories of resilient element cyclic loading. The obtained results make possible rather accurately to take into account effect of the shell and the filler material resilient characteristics, their geometrical parameters and tribological properties on operational characteristics of drilling devices for vibration protection. In its turn, this makes possible to use efficient drilling vibration protection devices, develop vibroinsulator shell designs by the criteria of maximum compliance and required damping level.
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Xu, Lin, Xue Xun Guo, and Jun Yan. "Feasibility Study on Active Control of Hydraulic Electromagnetic Energy-Regenerative Absorber." Advanced Materials Research 139-141 (October 2010): 2631–35. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2631.
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This paper proposes a design of a new shock absorber with combined mechanical- electromagnetic- hydraulic structure, and expounds its working principles. This new type of absorber can recyle the vibration energy and transform it into electrical energy for use. However, in its working process, the damping force in extension stroke is always smaller than that in compression stroke, which is determined by the inner structure, while in traditional absorbers, it is just the opposite. This does not meet the practical demands. Directing at this problem, the paper puts out a way to make real-time adjustment to the damping force by controlling the generator load, and tests the feasibility with a simulation model built with AMESim. The test result reveals that the method is feasible. This contributes a lot to the future further research on active control.
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Warczek, Jan, Rafał Burdzik, and Grzegorz Peruń. "The Method for Identification of Damping Coefficient of the Trucks Suspension." Key Engineering Materials 588 (October 2013): 281–89. http://dx.doi.org/10.4028/www.scientific.net/kem.588.281.
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The modern commercial vehicle with a weight of more than 3,5 [Mg] is a complex design solution, which contains many of mechatronic systems. The standard equipment are the ability of the driver assistance systems such as ABS (Anti-Lock Braking System), ESP (Electronic Stability Program), ASR (Acceleration Slip Regulation). The technical condition of the modern car's suspension determines the value of the indicators of road safety. An essential element of the suspension system, whose function is to change the mechanical vibration energy into thermal energy, is the shock absorber. Incorrect functioning of shock absorbers affects the quality of the operation of these systems improve safety. In the case of gradually wears of shock absorber even an experienced driver is able to notice this phenomenon. For this reason it becomes necessary the need for regular technical condition monitoring of dampers. Diagnostic dampers on buses and trucks are limited to the organoleptic examination and propose based on intermediate symptoms such as accelerated tire wear. The paper describes the method for estimating the suspension damping characteristics of commercial vehicle in operating conditions.
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Guntur, Harus Laksana, Wiwiek Hendrowati, and Solichin Mochammad. "The Effect of Using Current Stabilizer to the Dynamic Characteristic of a Regenerative Shock Absorber." Applied Mechanics and Materials 758 (April 2015): 137–42. http://dx.doi.org/10.4028/www.scientific.net/amm.758.137.
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Most of the energy from the vehicle is wasted in the form of heat energy and vibration. On vehicles, the largest vibration occurs in the suspension system. The development of a mechanism which can recover the vibration energy and convert it into electrical energy, named Regenerative Shock Absorber (RSA), will be detailed in this paper. The prototype of RSA which consist of gear transmission and an electromagnetic type electric generator was studied and analyzed. Electrical circuit signal conditioner / stabilizer is added into the RSA system to stabilize the output current of the generator so that the generated electrical energy can be stored in the battery of 6 volts. The characteristics of the RSA are obtained by testing the value of the damping coefficient, the energy absorbtion capacity, and the generated electrical energy before and after going through a series of signal conditioner. Experiment was also performed by measuring the acceleration response time of the sprung and un-sprung suspension system that uses RSA with damping ratio value of 0.6. From this research, it is found that RSA design with stabilizer circuit can produce more stable electric current and voltage. The measurement results show the value of the electrical voltage output through the generator is fluctuating with an average value of 15 volts and a constant 6 volts output is obtained through the signal conditioning circuit. Furthermore, the dynamic response is obtained in the form of acceleration time-value of less than 0.2 m/s2 in a corresponding ISO 2631 standard is stated very comfortable.
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Afnison, Wanda, Erzeddin Alwi, Hasan Maksum, Bahrul Amin, and M. Yasep Setiawan. "Development of the Electromagnetic Regenerative Shock Absorber as an Energy Harvesting Tool for Vehicles." MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering 1, no. 3 (September 1, 2019): 31–42. http://dx.doi.org/10.46574/motivection.v1i3.26.
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This research is a development of previous research entitled "Designing Regenerative Shock Absorber as a Vibration Energy Harvesting Tool on Vehicles" in the PUPT scheme funded by PNBP UNP 2017. In this study optimization of design oriented to energy generation was carried out while also paying attention to aspects driving comfort that might change due to the installation of a harvesting energy mechanism. One aspect of the change occurred in the type of magnet used, namely a ring type magnet with a type of neodymium material.From the test results obtained by changing the value of the efficiency of the shock absorber after the ERSA mechanism is installed by 2%, this condition also has an impact on the dissimilarity of the attenuation value obtained by 2% for the front-rear (left) and (right) wheels. In terms of generation voltage obtained the maximum generation voltage obtained is 25,600 mV. Based on the data obtained, it needs further development ERSA, especially in the aspect of the electromagnetic mechanism to optimize the generation of electrical energy.
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Gonca, Vladimirs, Svetlana Polukoshko, and Egons Lavendelis. "Dissipative and Damping Properties of Multi-layered Rubber-Metal Vibration Absorber." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2015): 46. http://dx.doi.org/10.17770/etr2015vol1.632.
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<p class="R-AbstractKeywords"><span lang="EN-GB">Rubber and<em> </em></span><span lang="EN-GB">rubber-metal (RM) elements</span><span lang="EN-GB"> are successfully used as bearing, joints, compensating devices, vibration and shock absorbers</span><span lang="EN-GB"> in civil engineering and machine building because of rubber and rubberlike materials (elastomers) have a capability of absorbing input energy much better than other construction materials. The elastic properties of rubber in such supports allows reverse backward to its original position under dynamic load action. </span><span lang="EN-US">Along with the instantaneous elastic deformation these materials exhibit a retarded elastic deformation, viscous flow (creep) and relaxation.</span><span lang="EN-GB">The mechanical properties of rubber which are necessary for the optimal design of antivibration devices are next: bulk modulus of compression, dynamic and static shear modulus, energy dissipation factor. To describe the relationship between the compressive (or shear) stress <em>σ(t)</em> and strain <em>ԑ(t)</em> the creep and relaxation kernel, taking into account the viscoelastic properties of the rubber, is used. The kernels proposed by A. Rzhanitsin, Y. Rabotnov, M. Koltunov give satisfactory results for the mechanical properties of rubber in the mean frequency domain (10<sup>-3</sup> < ω < 10<sup>3</sup> s<sup>-1</sup>). In this paper for the accounting of dissipative properties of the rubber Rabotnov’s kernel is used, the energy loss during one oscillation period is calculated. The flat-type RM absorber with kinematic excitation, which lower base oscillates harmonically is considered, oscillation parameters of the upper base on which the protected object is placed, are calculated. Damping properties are expressed by the ratio of the amplitude of the forced oscillations of the upper base (and object) to the amplitude of driving lower base</span><span lang="EN-GB">. </span></p>
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Yang, Haixu, Baolei Yang, Haibiao Wang, Maohua Zhang, and Songyuan Ni. "Research on Dynamic Characteristics of Joint of RC Frame Structure with NES." Sustainability 14, no. 18 (September 7, 2022): 11229. http://dx.doi.org/10.3390/su141811229.
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The NES (nonlinear energy sink) is a new type of nonlinear tuned mass damper that is connected to the shock-absorbing main structure through strong nonlinear stiffness and viscous damping. The vibrational energy in the main structure is transferred to the NES oscillator by means of target energy transfer. A shaking table test of a 1:4 scaled RC (Reinforced Concrete) frame structure model with a new type of NES shock absorber was conducted to study the damping effect of the NES shock absorber, especially for the influence of joint strength and deformation. The NES used in this experiment has a relatively large nonlinear stiffness and a wide vibration absorption frequency band. The variation of reinforcement strains, node failure mode, and structural natural frequency of 1 story and two-layer joints of the model frame structure with NES were studied. The test results showed that NES could effectively reduce the strains of longitudinal reinforcement and stirrup in beams and columns and delay the plastic hinge development at the bottom and the top of the column. The frame model with NES installed has failures at the beam ends and shear failures at the nodes, realizing the seismic mechanism of solid columns and weak beams. Compared with ordinary seismic structures, the NES can effectively reduce the shear stress of concrete at the joints and alleviate the shear failure of joints. The final failure of the NES shock absorbing structure was the yielding of the steel bars at the bottom of the column and the crushing of the concrete at the foot of the column, and the connection between the column foot and the backplane became loose simultaneously. The decreasing rate of the vibration frequency declined due to the NES with varied broadband absorbing capability. It can be seen that the NES shock absorber not only has a good effect on reducing the seismic response of the structure, but more importantly, the damage of the structural nodes is greatly reduced, and therefore, the seismic capacity of the structure improved.
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Yang, Haixu, Feng Zhu, Haibiao Wang, Liang Yu, and Ming Shi. "Construction principle of NES shock absorber and its application in frame structure." Multidiscipline Modeling in Materials and Structures 16, no. 4 (December 24, 2019): 625–45. http://dx.doi.org/10.1108/mmms-04-2019-0066.
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Purpose The purpose of this paper is to describe the structure of nonlinear dampers and the dynamic equations, and nonlinear realization principles and optimize the parameters of nonlinear dampers. Using the finite element method to analyze the seismic performance of the frame structure with shock absorber. Design/methodology/approach The nonlinear shock absorber was installed in a six-storey reinforced concrete frame structure to study its seismic performance. The main structure was designed according to the eight degree seismic fortification intensity, and the time history dynamic analysis was carried out by Abaqus finite element software. EL-Centro, Taft and Wenchuan seismic record were selected to analyze the seismic response of the structure under different magnitudes and different acceleration peaks. Findings Through the principle study and parameter analysis of the nonlinear shock absorber, combined with the finite element simulation results, the shock absorption performance and shock absorption effect of the nonlinear energy sink (NES) nonlinear shock absorber are given as follows: first, the damping of the NES shock absorber is satisfied, and the linear spring stiffness and nonlinear stiffness of the shock absorber are based on the relationship k1=kn×kl2, so that the spring design length is fixed, and the linear stiffness of the shock absorber can be obtained. The nonlinear shock absorber has the characteristics of high rigidity and frequency bandwidth, so that the frequency is infinitely close to the frequency of the main structure, and when the mass of the shock absorber satisfies between 0.056 and 1, a good shock absorption effect can be obtained, and the reinforced concrete with the shock absorber is obtained. The frame structure can effectively reduce the seismic response, increase the natural vibration period of the structure and reduce the damage loss of the structure. Second, the spacer and each additional shock absorber have a small difference in shock absorption effect. After the shock absorber parameters are accurately calculated, the number of installations does not affect the shock absorption effect of the structure. Therefore, the shock absorber is properly constructed and accurately calculated. Parameters can reduce costs. Originality/value New shock absorbers reduce earthquake-induced damage to buildings.
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Grządziela, Andrzej, and Marcin Kluczyk. "Shock Absorbers Damping Characteristics by Lightweight Drop Hammer Test for Naval Machines." Materials 14, no. 4 (February 6, 2021): 772. http://dx.doi.org/10.3390/ma14040772.
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The technical requirements for naval ships machine foundations are far more strict in comparison to merchant’s vessels. These requirements are confirmed in the military standardization of many countries. Underwater Explosion (UNDEX phenomena) detonation pulses, force naval engineers to design and implement different shock absorbers made from a wide variety of materials. This study presents the tests results of typical shock absorber designs made of various types of rubber and elastomers. The initial objective of the study was to determine the energy absorption of shock impacts, the choice of materials capable of operating within the temperature range of 0 °C to 70 °C, resistance to contact with oils and marine fuel, performance at frequencies ranging from 5 to 30,000 Hz, and absorption no less than 40% of harmonic vibration energy. Initial studies conducted on tensile testing machine were used to determine the static and dynamic stiffness of a shock absorbers. Considerations of stiffness coefficient for the linear and nonlinear range is typical for shock pulses. Further tests were carried out on a lightweight drop hammer to determine the characteristics of the damping coefficient for high-speed wave interactions—Shock Response Spectrum (SRS). The final aim of the study was to assess the repeatability of the shock absorbers response to multiple impact loads. Mechanical properties describing possibilities of tested dampers materials to absorb energy of UNDEX were also presented.
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Wang, Shu Shu, Xiao Meng Shen, and Xiao Jian Tu. "A Novel Energy-Harvesting Active Radial Bogie for Railway Vehicles: Design, Simulation and HIL Test." Applied Mechanics and Materials 733 (February 2015): 695–98. http://dx.doi.org/10.4028/www.scientific.net/amm.733.695.
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With the increasing development of railway transportation, the wheel-rail wearing problem is becoming more and more serious while the increasing of both the operating speed and loading weight of railway vehicles. Active radial bogie is one of the hotspots for research in the area of decreasing the wheel-rail wearing issues. Meanwhile, the energy dissipation problem has been restricting its development. This paper puts forward a novel energy-harvesting active radial bogie for rail vehicles. Making use of the hydraulic electromagnetic energy-regenerative shock absorber, the vertical vibration energy could be harvested while train is traveling. Detailed study and evaluation for this active radial bogie will be presented. The tests and simulation results prove the effectiveness of the proposed bogie mechanism and control.
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Luo, Yifan, Hongxin Sun, Xiuyong Wang, Lei Zuo, and Ning Chen. "Wind Induced Vibration Control and Energy Harvesting of Electromagnetic Resonant Shunt Tuned Mass-Damper-Inerter for Building Structures." Shock and Vibration 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/4180134.
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This paper proposes a novel inerter-based dynamic vibration absorber, namely, electromagnetic resonant shunt tuned mass-damper-inerter (ERS-TMDI). To obtain the performances of the ERS-TMDI, the combined ERS-TMDI and a single degree of freedom system are introduced. H2 criteria performances of the ERS-TMDI are introduced in comparison with the classical tuned mass-damper (TMD), the electromagnetic resonant shunt series TMDs (ERS-TMDs), and series-type double-mass TMDs with the aim to minimize structure damage and simultaneously harvest energy under random wind excitation. The closed form solutions, including the mechanical tuning ratio, the electrical damping ratio, the electrical tuning ratio, and the electromagnetic mechanical coupling coefficient, are obtained. It is shown that the ERS-TMDI is superior to the classical TMD, ERS-TMDs, and series-type double-mass TMDs systems for protection from structure damage. Meanwhile, in the time domain, a case study of Taipei 101 tower is presented to demonstrate the dual functions of vibration suppression and energy harvesting based on the simulation fluctuating wind series, which is generated by the inverse fast Fourier transform method. The effectiveness and robustness of ERS-TMDI in the frequency and time domain are illustrated.
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Lyashenko, M. V., V. V. Shekhovtsov, P. V. Potapov, and A. I. Iskaliyev. "Methods for controlling the elastic damping characteristics of pneumatic seat suspensions." Traktory i sel'hozmashiny 1, no. 2 (2021): 27–33. http://dx.doi.org/10.31992/0321-4443-2021-2-27-33.
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The pneumatic seat suspension is one of the most important, and in some situations, one of the key components of the vibration protection system for the human operator of the vehicle. At the present stage of scientific and technical activities of most developers, great emphasis is placed on controlled seat suspension systems, as the most promising systems. This article analyzes the methods of controlling the elastic damping characteristics of the air suspension of a vehicle seat. Ten dif-ferent and fairly well-known methods of changing the shape and parameters of elastic damping characteristics due to electro-pneumatic valves, throttles, motors, additional cavities, auxiliary mechanisms and other actuators were considered, the advantages, application limits and disad-vantages of each method were analyzed. Based on the results of the performed analytical procedure, as well as the recommendations known in the scientific and technical literature on improving the vibration-protective properties of suspension systems, the authors proposed and developed a new method for controlling the elastic-damping characteristic, which is implemented in the proposed technical solution for the air suspension of a vehicle seat. The method differs in the thing that it im-plements a cyclic controlled exchange of the working fluid between the cavities of the pneumatic elastic element and the additional volume of the receiver on the compression and rebound strokes, forming an almost symmetric elastic damping characteristic, and partial recuperation of vibrational energy by a pneumatic drive, presented in the form of a rotary type pneumatic motor. In addition, the method does not require an unregulated hydraulic shock absorber, while still having the ad-vantage of improved vibration-proof properties of the air suspension of a vehicle seat over a wide range of operating influences.
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Chahyadi, Hendry D. "Simulation and Analysis of Two-Mass Suspension Modification Using MATLAB Programming." ACMIT Proceedings 3, no. 1 (March 18, 2019): 160–65. http://dx.doi.org/10.33555/acmit.v3i1.39.
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The designs of automotive suspension system are aiming to avoid vibration generated by road condition interference to the driver. This final project is about a quarter car modeling with simulation modeling and analysis of Two-Mass modeling. Both existing and new modeling are being compared with additional spring in the sprung mass system. MATLAB program is developed to analyze using a state space model. The program developed here can be used for analyzing models of cars and vehicles with 2DOF. The quarter car modelling is basically a mass spring damping system with the car serving as the mass, the suspension coil as the spring, and the shock absorber as the damper. The existing modeling is well-known model for simulating vehicle suspension performance. The spring performs the role of supporting the static weight of the vehicle while the damper helps in dissipating the vibrational energy and limiting the input from the road that is transmitted to the vehicle. The performance of modified modelling by adding extra spring in the sprung mass system provides more comfort to the driver. Later on this project there will be comparison graphic which the output is resulting on the higher level of damping system efficiency that leads to the riding quality.
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Haider, Syed Zeeshan, and Chen Qinghua. "Design and Structure Research of Forklift Seats Based on Ergonomic." Asian Journal of Advanced Research and Reports 17, no. 3 (February 23, 2023): 1–18. http://dx.doi.org/10.9734/ajarr/2023/v17i3469.
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With the continuous development of the logistics industry, forklift trucks, as essential handling equipment, play an important role. In recent years, the sales volume of forklifts has increased dramatically, and the manufacturers of forklifts have developed more rapidly. Besides having high energy sales, modern forklifts also have to consider safety. The forklift seat is the most contact between the driver and the truck. Road factors cause the vibration of the forklift truck, and the operation process is reduced by the seat, which improves the safety and driving conditions for the driver. Based on ergonomics, this paper analyzes the working environment of the forklift seat, puts forward the design goal of the seat, and extracts the design method to improve the safety and comfort of the forklift seat based on ergonomics theory: the seat comfort position, shape, size and other comprehensive design research. According to the data on adult human body size provided by GBl0000-88 and the ergonomics principle of seat design, the relationship between seat parameters and human body size data is studied. A forklift seat size data suitable for the The seat's comfort (H point) position range is calculated using Matlab software. Based on the ergonomics design module of CATIA, this paper evaluates the comfort of the forklift seat, and the results show that each part meets the comfort requirements of the forklift seat. ADAMS/View simplifies the seat frame structure, the shock absorber model is established, the drive is created using the SWEEP function, and the virtual prototype model is established. The related transfer characteristic curves are obtained according to the dynamic simulation of the seat frame with different load weights. The results show that the increase of spring stiffness shows a linear increase. It is shown that increasing the damping coefficient of the spring can effectively enhance vibration reduction. This conclusion is also verified by driving the vibration test of the forklift seat.
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"Perspective directions of increasing the damping properties of shock absorbers of vehicle suspensions." Truck, August 2022, 3–13. http://dx.doi.org/10.36652/1684-1298-2022-8-3-13.
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This paper proposes a new approach to reducing the vibration load of vehicles on rough roads based on the synthesis of innovative structures of adaptive suspensions with self-adjusting characteristics, which are provided by hydraulic shock absorbers with stepped cyclic regulation, inertial-friction shock absorbers with energy recovery in the oscillation cycle or combined damping systems from damping units various types. Descriptions of the original design schemes of various types of damping units (hydraulic and inertial-friction shock absorbers, as well as combined damping systems) are given in relation to three promising areas for improving suspensions, the use of which will improve energy efficiency, safety and vibration protection of vehicles for various purposes. Keywords: suspension, self-regulation of characteristics, hydraulic shock absorber, inertia-friction shock absorber, dynamic vibration damper, combined damping
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"“Design and Perfomance Analysis of MR Twin Tube Shock Absorber Damper of Semi-Active Suspension System”." International Journal of Innovative Technology and Exploring Engineering 9, no. 3 (January 10, 2020): 3015–21. http://dx.doi.org/10.35940/ijitee.b6806.019320.
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A shock absorber suspension system of vehicle and bicycle in automobile during travelling on a road surface leads jerky, bound and rebound motion a bicycle or vehicle due to this problem by shock and vibration creates discomfort and unsafely to driver and passenger. The vibration coming from vehicle leads to pain, discomfort and dissipated heat and energy which impact on reduction in efficiency shock absorber on semi active suspension system. Comparison method of actual and design Shock absorber by reductions spring stiffness, use falling tube viscometer method for finding efficient fluid mixture for reducing shock and vibration amplitude of theoretical and experimental method. In this research more shock absorbent and energy efficient Shock Absorber Damper is developed for Splendor two wheeler to controlled the vibration of semi active suspension system of vehicle. The fluid greatly increases its viscosity and result in large damping force, less power consummation, fast and smooth response, and cost effective design and environmentally friendly. The damping force increase and decrease in leads to bounce and renounces.
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Sriramdas, Rammohan, Shreevar Rastogi, and Rudra Pratap. "Design Considerations for Optimal Absorption of Energy from a Vibration Source by an Array of Harvesters." Energy Harvesting and Systems 3, no. 2 (January 1, 2016). http://dx.doi.org/10.1515/ehs-2015-0021.
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AbstractDynamic vibration absorption is a passive technique for suppressing unintended vibrations. Optimal absorption of energy from a vibration source entails the determination of absorber parameters such as resonant frequency and damping. In the present work, we propose a method to obtain these parameters for a generic case of large number of identical vibration absorbers placed on a vibration source. We discuss an iterative procedure to find the optimum absorber resonant frequency and damping by minimizing the total energy absorbed by the system. We also analyse the influence of damping of the entire set of absorbers on the total energy absorbed and the effect of the absorber mass on the bandwidth of absorption. The proposed method is verified by analysing the response of a set of cantilever absorber beams placed on a vibrating cantilever plate. The resonant frequencies of the system with different number of absorbers are verified experimentally. We identify, using our method, the absorber mass, resonant frequency and damping of the absorber at which significant amount of energy supplied to the system flows into absorbers. A potential application of this method in the context of energy harvesting is the design of harvesters for a given vibration source. We emphasize through our work that monitoring energies in the system and optimizing them is both rational and vital for designing multiple harvesters that absorb energy from a given vibration source optimally.
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Shen, Renjie, Xiangdong Qian, Jianfang Zhou, and Chin-Long Lee. "Characteristics of passive vibration control for exponential non-viscous damping system: Vibration isolator and absorber." Journal of Vibration and Control, October 7, 2022, 107754632211309. http://dx.doi.org/10.1177/10775463221130925.
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Materials or structures made of polymers or composites often exhibit non-viscous damping behavior. The non-viscous damping forces that depend on the history velocity can be expressed by the exponential non-viscous damping model. Some polymer or composite materials can be used as damping materials for kinetic energy absorption in the dynamic systems. Vibration isolator and absorber are usually considered for shock absorption. In this study, transfer ratios of vibration isolator and absorber with exponential non-viscous damping system are derived by using the Laplace transform. The dimensionless amplitude of vibration absorber with exponential non-viscous damping is derived too. Compared to viscous damping system, transfer ratio and dimensionless amplitude of exponential non-viscous damping system are influenced by the ratio of the relaxation parameter and natural frequency or the frequency of the external load. With the non-viscous damping material used in vibration control, the ratio is therefore a non-negligible factor which should be considered in analysis.
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Rajarathinam, M., and Shaikh Faruque Ali. "Parametric Uncertainty and Random Excitation in Energy Harvesting Dynamic Vibration Absorber." ASCE-ASME J Risk and Uncert in Engrg Sys Part B Mech Engrg, December 2, 2020. http://dx.doi.org/10.1115/1.4049211.
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Abstract An energy harvesting dynamic vibration absorber is studied to suppress undesirable vibrations in a host structure as well as to harvest electrical energy from vibrations using piezoelectric transduction. The present work studies the feasibility of using vibration absorber for harvesting energy under random excitation and in presence of parametric uncertainties. A two degrees of freedom model is considered in the analytical formulation for the host along with the absorber. A separate equation is used for energy generation from piezoelectric material. Two studies are reported here, (i) with random excitation where the base input is considered to be Gaussian; (ii) parametric uncertainty is considered with harmonic excitation. Under random base excitation the analytical results show that, with the proper selection of parameters, harvested electrical energy can be increased along with the reduction in vibration of the host structure. Graphs are reported showing trade-off between harvested energy and vibration control. Whereas, Monte Carlo simulations are carried out to analyze the system with parametric uncertainty. This showed that the mean harvested power decreases with an increase in uncertainties in the natural frequency as well as damping ratio. In addition, optimal electrical parameters for obtaining maximum power for the case of uncertain parameters are also reported in this study.
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Wang, Xi, Zhenyuan Xu, Dida Wang, Tao Wang, Guoqiang Fu, and Caijiang Lu. "Dynamic and Energetic Characteristics Comparison of a Tri-Stable Vibration Absorber and Energy Harvester Using Different Permanent Magnet Arrays." International Journal of Structural Stability and Dynamics, February 9, 2022. http://dx.doi.org/10.1142/s0219455422500626.
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In this paper, it has been demonstrated that the tri-stable energy harvesters are more efficient than the bi-stable and mono-stable harvesters in energy harvesting. The oscillators of energy harvesters can be designed as a vibration absorber to attenuate the vibration of the primary system. This paper presents a combined vibration absorber and energy harvester (VAEH) system for simultaneous vibration control and energy harvesting, and the dynamic performances of the VAEH with two magnet arrays of the same geometric parameters, but opposite polarity external magnets, are studied. The mathematical model of the tri-stable VAEH is established, by which the dynamic and energetic characteristics of the VAEH system are obtained. It is found that the potential barrier and potential well depth of the repulsive magnet array are greater than the attractive one, reducing the voltage harvesting efficiency under harmonic and impulsive excitation. Both the amplitude and frequency of excitation are crucial to the dynamic response of the VAEH system. The attractive VAEH performs better than the repulsive VAEH in vibration suppression, especially for high impulse input. From the frequency response of the system, the vibration of the primary system is shown to be magnified at certain frequencies. The magnified primary system vibration and the harvested voltage can be attenuated by increasing the VAEH damping, which is a critical parameter to balance the weight of vibration suppression and energy harvesting. The attractive VAEH designed in this paper performs better than the repulsive one in vibration suppression and energy harvesting.
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Giaralis, Agathoklis. "An Inerter-Based Dynamic Vibration Absorber with Concurrently Enhanced Energy Harvesting and Motion Control Performances Under Broadband Stochastic Excitation via Inertance Amplification." ASCE-ASME J Risk and Uncert in Engrg Sys Part B Mech Engrg, December 2, 2020. http://dx.doi.org/10.1115/1.4049213.
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Abstract This paper examines the performance of a regenerative dynamic vibration absorber, dubbed energy harvesting-enabled tuned mass-damper-inerter (EH-TMDI), for vibration suppression and energy harvesting in white noise excited damped linear primary structures. Single-degree-of-freedom (SDOF) structures under force and base excitations are studied as well as multi-degree-of-freedom (MDOF) structures under correlated random forces. The EH-TMDI includes an electromagnetic motor (EM), behaving as a shunt damper, sandwiched between a secondary mass and an inerter element connected in series. The latter element resists relative acceleration through a constant termed inertance which is readily scalable in actual inerter devices. In this regard, attention is herein focused on gauging the available energy for harvesting by the EM and the displacement variance of the primary structure as the inertance increases through comprehensive parametric investigations. This is supported by adopting inertance-dependent tuning formulae for the EH-TMDI stiffness and damping properties and closed-form expressions for the response of white-noise excited EH-TMDI-equipped SDOF and MDOF systems derived through random vibration theory. It is found that lightweight EH-TMDIs, having 1% the mass of the primary structure, achieve simultaneously improved vibration suppression and energy harvesting performance as inertance amplifies. For SDOF structures with grounded inerter, the improvement rate is higher for reduced inherent structural damping and increased EM shunt damping. For MDOF structures with non-grounded inerter, improvement rate is higher as the primary structure flexibility between the two EH-TMDI attachment points increases.
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Nochnichenko, Ihor, and Oleg Jakhno. "Energy analysis of transfer processes and their main characteristics in thermo mechanical damping systems." Mechanics and Advanced Technologies 5, no. 3 (December 30, 2021). http://dx.doi.org/10.20535/2521-1943.2021.5.3.248720.
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The article discusses the energy analysis of transfer processes in the damping system. The basic theoretical foundations based on the equations of the energy balance of the hydraulic shock absorber and the law of conservation of energy are presented. The proposed approach is associated with the development of a methodology and scheme for calculating the technical system of vibration damping. The schemes of interaction of the system through the phenomena of transfer and functioning of the vibration protection system with the environment are presented. It is shown that damper systems are based on the physical process of transformation of mechanical energy into thermal energy with subsequent dissipation into the environment. The total energy distribution in damping problems takes the following form the mechanical energy of motion is absorbed due to the hydraulic resistance of the liquid and turns into a dissipative component, which can reach 80% of the total energy. A mathematical model of the law of conservation of energy is presented which includes a dissipative function. The analysis of how it is possible to design work processes in a shock absorber due to energy dissipation and similarity criteria: Euler, Froude, Reynolds, etc. As a result of physical experiments, it was found that the movement of a fluid in hydraulic calibrated throttles gives rise to cavitation and various physical phenomena and accompanying processes, in which there is a significant change in the energy balance and energy dissipation in non-stationary modes of fluid movement.
The dependence of the total power loss of the shock absorber under changing operating conditions, and the diagram of physical processes and energy transformations in the problems of damping, which are in dissipative processes, are given. The article describes the principles that can be used for the design of devices and modules of damper systems of a wide class with the possibility of energy recovery and accumulation by introducing a damper into the system, for example, a motor generator, an inductor with permanent magnets or a peso element in the design of a traditional telescopic shock absorber.
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Zuo, Lei, and Pei-Sheng Zhang. "Energy Harvesting, Ride Comfort, and Road Handling of Regenerative Vehicle Suspensions." Journal of Vibration and Acoustics 135, no. 1 (February 1, 2013). http://dx.doi.org/10.1115/1.4007562.
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This paper presents a comprehensive assessment of the power that is available for harvesting in the vehicle suspension system and the tradeoff among energy harvesting, ride comfort, and road handing with analysis, simulations, and experiments. The excitation from road irregularity is modeled as a stationary random process with road roughness suggested in the ISO standard. The concept of system H2 norm is used to obtain the mean value of power generation and the root mean square values of vehicle body acceleration (ride quality) and dynamic tire-ground contact force (road handling). For a quarter car model, an analytical solution of the mean power is obtained. The influence of road roughness, vehicle speed, suspension stiffness, shock absorber damping, tire stiffness, and the wheel and chasses masses to the vehicle performances and harvestable power are studied. Experiments are carried out to verify the theoretical analysis. The results suggest that road roughness, tire stiffness, and vehicle driving speed have great influence on the harvesting power potential, where the suspension stiffness, absorber damping, and vehicle masses are insensitive. At 60 mph on good and average roads, 100–400 W average power is available in the suspensions of a middle-sized vehicle.
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Choi, Young-Tai, and Norman M. Wereley. "Self-Powered Magnetorheological Dampers." Journal of Vibration and Acoustics 131, no. 4 (July 14, 2009). http://dx.doi.org/10.1115/1.3142882.
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This study addresses the feasibility and effectiveness of a self-powered magnetorheological (MR) damper using in-situ energy harvested from the vibration and shock environment in which it is deployed. To achieve this, an energy-harvesting device is designed and added to a MR damper. This energy-harvesting device consists of a stator, a permanent magnet, and a spring and operates as an energy-harvesting dynamic vibration absorber (DVA). The dynamic equation for the self-powered MR damper is derived. To evaluate the vibration isolation capability of the self-powered MR damper, a single-degree-of-freedom engine mount system using the MR damper is simulated. The governing equation of motion for the engine mount system is derived. A parametric study is conducted to find the optimal stiffness of the energy-harvesting DVA for the engine mount system. The isolation performance of the engine mount system employing the self-powered MR damper is theoretically evaluated in the frequency domain.
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Zuppa, Leonardo Acho, Jan Awrejcewicz, Nataliya Losyeva, Volodymyr Puzyrov, and Nina Savchenko. "Energy Harvesting for System of Coupled Oscillators Under External Excitation in the Vicinity of Resonance 1:1." Journal of Computational and Nonlinear Dynamics 15, no. 12 (October 23, 2020). http://dx.doi.org/10.1115/1.4047555.
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Abstract Vibration energy is abundantly present in many natural and artificial systems and can be assembled by various devices, mainly employing the benefits of the piezo-electric and electromagnetic phenomena. In the present article, the electromechanical system with two degrees-of-freedom is considered. An additional element (dynamical vibration absorber or DVA) is attached to the main mass, whose vibrations are to be reduced. The DVA consists of a spring, damping, and piezo-electric elements for energy harvesting. The goal is to reduce the maximal possible responses of the main structure at the vicinity of external 1:1 resonance and at the same time collect energy from the vibration of the system. An analytical approach is proposed to find the solution of the problem. We show that the piezo-electric element allows effective energy harvesting and at the same has a very limited influence on reducing the amplitude of oscillations of the main mass. The theoretical results are confirmed by numerical experiments.
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Maksum, Hasan. "DESIGN OF ELECTROMAGNETIC REGENERATIVE SHOCK ABSORBER AS A TOOL OF HARVESTING VIBRATION ENERGY ON VEHICLE." International Journal of GEOMATE 15, no. 50 (October 1, 2018). http://dx.doi.org/10.21660/2018.50.53930.
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Zhang, Min, Cheng Hu, Jingwei Gao, and Peng Zheng. "Modelling, validation and parameter sensitivity of regenerative hydraulic-electric shock absorber." Engineering Computations, October 5, 2021. http://dx.doi.org/10.1108/ec-09-2020-0547.
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Purpose Suspension is a significantly important component for automotive and railway vehicles. Regenerative hydraulic-electric shock absorbers (RHSA) have been proposed for the purpose of attenuating vibration of vehicle suspension, and also recover kinetic energy originated from vehicle vibration that is conventionally dissipated by hydraulic dampers. To advance the technology, the paper aims to present an RHSA system for heavy-duty and railway vehicles and create a dynamic modelling to discuss on the development process of RHSA model. Design/methodology/approach First, the development of RHSA dynamic model can be resolved into three stage models (an ideal one, a second one with an added accumulator and a third one that considers both accumulator and system losses) to comprehensively evaluate the RHSA's characterisation. Second, a prototype is fabricated for testing and the results meet desired agreements between simulation and measurement. Finally, the study of key parameters is carried out to investigate the influences of hydraulic-cylinder size, hydraulic-motor displacement and accumulator pre-charged pressure on the RHSA system. Findings The findings of sensitivity analysis indicate that the component design can satisfy the damping characteristics and power performance required for heavy-duty vehicle, freight wagon and typical passenger train. The results also show that reducing the losses is highly beneficial for saving suspension energy, improving system reliability and increasing power-conversion efficiency. Originality/value The paper presents a more detailed method for the development and analysis of a RHSA. Compared with the typical shock absorbers, RHSA can also recover the vibration energy dissipated by suspension.
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Liu, Yilun, and Lei Zuo. "Mixed Skyhook and Power-Driven-Damper: A New Low-Jerk Semi-Active Suspension Control Based on Power Flow Analysis." Journal of Dynamic Systems, Measurement, and Control 138, no. 8 (May 25, 2016). http://dx.doi.org/10.1115/1.4033073.
Full textAbstract:
In practice, semi-active suspensions provide better tradeoffs between performances and costs than passive or active damping. Many different semi-active control algorithms have been developed, including skyhook (SH), acceleration-driven-damper (ADD), power-driven-damper (PDD), mixed SH and ADD (SH-ADD), and others. Among them, it has been shown that the SH-ADD is quasi-optimal in reducing the sprung mass vibration. In this paper, we analyze the abilities of vehicular suspension components, the shock absorber and the spring, from the perspective of energy transfer between the sprung mass and the unsprung mass, and propose a new sprung mass control algorithm named mixed SH and PDD (SH-PDD). The proposed algorithm defines a switching law that is capable of mixing SH and PDD, and simultaneously carries their advantages to achieve a better suspension performance. As a result, the proposed SH-PDD is effective in reducing the sprung mass vibration across the whole frequency spectrum, similar to SH-ADD and much better than SH, PDD, and ADD, while eliminating the control chattering and high-jerk behaviors as occurred in SH-ADD. The superior characteristics of the SH-PDD are verified in numerical analysis as well as experiments. In addition, the proposed switching law is extended to mix other semi-active control algorithms such as the mixed hard damping and soft damping, and the mixed SH and clipped-optimal linear quadratic regulator (LQR).