Journal articles: 'Shock absorber characteristics'

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Koojaroenpaisan, Rawiporn, and Paul Patterson. "GAZI and the Shock Absorber Market in Thailand." Asian Case Research Journal 17, no. 02 (December 2013): 243–66. http://dx.doi.org/10.1142/s0218927513500119.

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Siam Suspension Innovation Co. Ltd. (SSI) in 2004 manufactured the first local brand of shock absorber for motor cycles (GAZI brand) in Thailand. This case documents how several entrepreneurs with a passion for motorcycles grasped an opportunity to invent, manufacture and successfully brand a decorative shock absorber for the ubiquitous motorcycle riders of Thailand. Prior to the development of the GAZI brand, shock absorbers were simply just another OEM (original equipment manufacturer) component on a motor bike that was typically only replaced when it was worn out. Shock absorbers were differentiated on their performance characteristics of smoothness of ride. Siam Suspension Company (SSI) changed all that with their decorative GAZI brand that had a mass appeal to consumers under 25 years who possessed a 125–150cc motorcycle (by far the largest segment) who simply wanted their motorcycles to look attractive. Rather than compete in the high volume, low margin standard shock absorber segment, SSI positioned GAZI as a decorative shock absorber. However, because GAZI used a new innovative gas filled technology (all other brands used oil filled cylinders) it also gave a much smoother ride on the rough roads of Thailand. GAZI's management initially created a “first-mover” advantage by targeting Gen Y consumers and convincing them to use shock absorbers to decorate their motorcycles. Hence a replacement market was born for decorative shock absorbers, with many riders replacing the OEM shocks as soon as they purchased a new motorcycle. Sales grew at a rapid pace until other manufacturers of standard shocks saw the success of GAZI. At this time the barriers to entry were quite low. As a SME (small to medium size enterprise) with limited capital, the challenge for SSI in 2012 is how to regroup and stay one step ahead of the competition and protect its market share from further erosion.

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Halama, Jakub, Milan Klapka, and Ivan Mazůrek. "Experimental Methodology for Acoustic Diagnostics of Shock Absorbers." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 66, no. 5 (2018): 1119–25. http://dx.doi.org/10.11118/actaun201866051119.

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The application of acoustic measurements brings about a new diagnostic method for evaluating the conditions of shock absorbers. In shock absorber diagnostics, it is advantageous to observe and understand what phenomena occur during the working cycle in the inner tube. Using a non‑destructive and non‑contact method can avoid dismantling whole device. For the research of this new acoustic method, a classic sound meter, an automotive and a train shock absorber were used. FFT analysis and concurrent filtration were applied for the measurement evaluation of obtained data. It has been proven that applying acoustic methods can lead to diagnostics of aeration in the shock absorbers. A defective shock absorber changes its damping characteristics as well as noise radiation compared with the properly functioning one; these differences in noise are measurable and quantifiable. The results show that characteristics of acoustic radiation of the aerated shock absorbers relate to the shock construction type.

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Surace, C., K. Worden, and G. R. Tomlinson. "On the Non-Linear Characteristics of Automotive Shock Absorbers." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 206, no. 1 (January 1992): 3–16. http://dx.doi.org/10.1243/pime_proc_1992_206_156_02.

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The objectives of this paper are essentially twofold. In the first case an experimental study of a number of shock absorbers is presented; the restoring force surface method of non-linear system identification is applied in order to determine the non-linear characteristics of the absorbers in an easily visualizable manner. In the second part, a new physical model for the absorber is presented which incorporates effects due to compressibility of the fluid in the absorber; this provides a more realistic representation of the stiffness characteristics than previous simple models. The new model is compared with the experimental data.

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Voytko, A. M. "Methodology for substantiating the design parameters of a single-tube hydropneumatic shock absorber." Вестник гражданских инженеров 17, no. 4 (2020): 166–73. http://dx.doi.org/10.23968/1999-5571-2020-17-4-166-173.

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The article describes the developed methodology for calculating the parameters of a single-tube hydropneumatic shock absorber. The calculation procedure is presented including calculating the volume of the gas filling cavity, calculating the parameters of the gas and the working fluid, determining the energy intensity of the shock absorber, checking the possibility of cavitation in the operating modes, as well as calculating the strength of the shock absorber parts.. A comparative analysis results of the calculated characteristics and the experimental characteristics of the hydropneumatic shock absorber are presented, the absorber having been produced according to the obtained design parameters. Based on the analysis, recommendations are given to increase the running smoothness of the car by replacing the standard hydraulic shock absorbers with hydropneumatic ones, taking into account the selection of the throughput of the discharge valves.

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Sinilschikov, V. B., K. V. Melikhov, and S. A. Kunavich. "Analysis of the Operation of an Arched Elastomeric Shock Absorber Under Two-Axial Loading." Proceedings of Higher Educational Institutions. Маchine Building, no. 12 (741) (December 2021): 73–82. http://dx.doi.org/10.18698/0536-1044-2021-12-73-82.

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Elastomeric shock absorbers are used in various technical fields to protect equipment from impacts. Elastomers made in an arched shape have complex nonlinear force characteristics due to large deformations, loss of stability of working elements and closing of surfaces. In this regard, obtaining the power characteristics of arched elastomeric shock absorbers is a complex computational problem. It is noteworthy that, in the literature, these characteristics are given only for the case of normal compression. However, when assessing the possibility of using a shock-absorbing system based on arched elastomeric shock absorbers, it is necessary to take into account their lateral force. The study proposes to solve the problem of determining the elastic force characteristics of a shock absorber while operating in the normal and lateral directions in the system of finite element analysis in a flat formulation. Analytical expressions are obtained for the normal and transverse static reactions of the shock absorber under simultaneous loading in the normal and transverse directions. Analytic expressions can be used to simulate complex shock-absorbing systems with a large number of such shock absorbers.

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Han, Y.-M., M.-S. Seong, S.-B. Choi, and N. M. Wereley. "Damping force characteristics of electrorheological shock absorbers with different electrode designs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 2 (February 1, 2010): 293–304. http://dx.doi.org/10.1243/09544062jmes1665.

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This article presents the effect of electrode design parameters on the damping force of an electrorheological (ER) shock absorber for passenger vehicles. As a first step, an ER fluid is synthesized by dispersing arabic gum particles into non-conducting oil, and its field-dependent Bingham characteristics are experimentally evaluated. The Bingham model of the ER fluid is then formulated and incorporated with the governing equations of motion of the ER shock absorber. Subsequently, several ER shock absorbers are designed and manufactured with various electrode designs, which have three different electrode gaps, lengths, and materials, respectively. The field-dependent damping force of the manufactured shock absorbers is demonstrated in the time domain and compared with simulation results. In addition, the vibration control performance of a quarter-car suspension system is presented and compared with different electrode gaps and lengths.

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Yu, Yuewei, Leilei Zhao, Changcheng Zhou, and Lin Yang. "Modeling and simulation of twin-tube hydraulic shock absorber thermodynamic characteristics and sensitivity analysis of its influencing factors." International Journal of Modeling, Simulation, and Scientific Computing 11, no. 02 (March 25, 2020): 2050012. http://dx.doi.org/10.1142/s1793962320500129.

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In order to find out the sensitivity of the thermophysical and structural parameters to the thermodynamic characteristics of twin-tube hydraulic shock absorbers, based on the bench test, a method for calculating the time-varying rate of the external work on the shock absorber oil is proposed. And then, a thermodynamic model of the twin-tube hydraulic shock absorber is established by using the basic thermodynamic principles. By analyzing the influence of each parameter on the thermodynamic characteristics of the shock absorber, it can be seen that, the radius of the working cylinder outer wall has the greatest influence on the temperature rise of the shock absorber, followed by the thermal conductivity of the oil, the height of the oil, the heat transfer length of the cylinder barrel, the radius of the oil storage cylinder outer wall, the emissivity of the oil storage cylinder outer wall, the height of the nitrogen, the thermal conductivity of the nitrogen, the specific heat capacity of the oil, the density of the oil, the thermal conductivity of the cylinder, and the mass of the working oil. The kinematic viscosity of the oil has the least influence on the temperature rise of the shock absorber. The research can provide an effective theoretical guidance and reference for the design of the twin-tube hydraulic shock absorber.

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Shan, Chun Xian, Lu Cheng Sun, and Mao Hong Sui. "Outer Characteristics Simulation and Performance Analysis of Motorcycle’s Rear Shock Absorber." Advanced Materials Research 926-930 (May 2014): 806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.806.

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Motorcycle’s rear shock absorber has been built as a nonlinear mathematical model to analyze the shock absorber damping force characteristic. The model has been divided into various subsystems that including hydrodynamics flow model, friction model, elastic deformation model, and gas pressure model. It has been implemented in MATLAB/Simulink environment, and validated against experimental test data. The results show that the model is sufficiently accurate, the practical behavior of the shock absorber can be reproduced. The relationship between the valve system parameters and shock absorber outer characteristics has also been analyzed. Furthermore, the influence of valve system parameters is analyzed to provide some theoretical basis for the motorcycle shock absorber performance optimization and structure improvement.

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Liu, Xiao Chuan, Shi Xing Zhu, and Yong Gang Yang. "Design and Drop Test of Aircraft Landing Gear’s Shock Absorber Based on Magnetorheological Damper." Applied Mechanics and Materials 665 (October 2014): 601–6. http://dx.doi.org/10.4028/www.scientific.net/amm.665.601.

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The structure of a shock absorber based on magnetorheological (MR) damper with a metering pin is proposed, and structure of the magnetic circuit of MR damper is optimized. By drop tests, the damping characteristics of the shock absorber and damping effect are tested. The experimental results show that the shock absorber has the characteristic of a wide damping force adjustment range and lower energy dissipation. The maximum vertical load and shock absorber piston displacement can be changed at same drop height by changing the current. It has also been proved that shock absorber based on MR damper is better than conventional oleo-pneumatic shock absorber on adjustment of damping force.

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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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Repin, Sergei, Roman Litvin, Victor Kuzmichev, and Ivan Vorontsov. "AUTOMOTIVE SHOCK ABSORBERS’ APPLICABILITY FOR DAMPING RESONANT OSCILLATIONS IN CONSTRUCTION MACHINES." Architecture and Engineering 6, no. 1 (2021): 81–87. http://dx.doi.org/10.23968/2500-0055-2021-6-1-81-87.

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Introduction: Many vibration transport and technological machines (VTTM) such as conveyors, screens, crushers, etc. operate in a high-frequency mode, or above resonance. Resonance occurs during machine start and slowdown, resulting in sharply rising values of the amplitude and velocity of oscillations. Resonance affects VTTMs adversely due to increased dynamic loads reducing machinery operating life and reliability and causing the noise. Purpose of the study: We aim to provide a theoretical substantiation for the possibility to apply automotive shock absorbers to VTTM oscillatory process control and develop an example of practical implementation for such a device. Methods: The method of controlling oscillatory processes in VTTMs lies in the use of dual-mode shock absorbers. In the operating mode, shock absorbers offer minimum resistance to motion. In the resonance mode, resistance increases, therefore, the amplitude decreases to a predetermined value. Results: We simulate the VTTM oscillatory process in order to determine the characteristics of a damping device, which ensures the suppression of resonant oscillations but does not affect the vibration operating process. We propose a new technical device implementing the required oscillation characteristics. The device is made in the form of a hydro-pneumatic shock absorber, similar to automotive shock absorbers in terms of design. Such a design makes it possible to offer slight damping of the machine’s useful (operating) vibration, but, at the same time, damping increases significantly in the case of resonant amplitudes. The originality of our study lies in the development of a new type of hydraulic shock absorber, for which a utility model patent has been obtained. The scientific novelty of the study is in the mathematical description of oscillation damping with the new shock absorber, in the development of software for oscillatory process analysis according to the developed mathematical model, and in the results of computer simulation for shock absorber operation.

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Czop, Piotr, and Damian Slawik. "Validation of Fatigue Model of a Hydraulic Shock Absorber Equipped with Shim Stack Valves." Journal of Physics: Conference Series 2184, no. 1 (March 1, 2022): 012057. http://dx.doi.org/10.1088/1742-6596/2184/1/012057.

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Abstract The aim of the paper is to formulate and validate the fatigue model of a shock absorber equipped with shim-based clamped valves. The fatigue model has application potential in a virtual valve system pre-selection process during the shock absorber design and configuration stage. It allows the required testing capacity at shock absorber manufacturers to be significantly reduced, i.e. the number of long-term and expensive fatigue tests performed on servo-hydraulic load frame testers. The shock absorber fatigue model is a combination of the previously developed finite element model [1] and analytical routines using the experimentally derived Wöhler characteristics of shim materials [2]. The fatigue model validation process was conducted with a high-performance servo-hydraulic load frame tester. Six shock absorbers were subjected to the same long-cycle kinematic sine-load and tested until initial valve damage symptoms appeared. The paper reports the fatigue calculation process and validation results. The obtained model accuracy in the range of ±30% error of shock absorber life-time prediction. This result is accurate enough for the model to be recommended as a quick-and-dirty engineering tool saving shock absorber development costs.

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Amornsawaddirak, Teerapharp, Sittikorn Lapapong, Szathys Songschon, and Masaaki Okuma. "Physical Characteristics of Twin-Tube Shock Absorber." SAE International Journal of Passenger Cars - Mechanical Systems 7, no. 1 (March 24, 2014): 375–81. http://dx.doi.org/10.4271/2014-01-2001.

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Więckowski, D., K. Dąbrowski, and G. Ślaski. "Adjustable shock absorber characteristics testing and modelling." IOP Conference Series: Materials Science and Engineering 421 (October 11, 2018): 022039. http://dx.doi.org/10.1088/1757-899x/421/2/022039.

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Eickhoff, Mathias, Alexander Kruse, Andreas Tischer, Jörg Pagel, and Hendrik Marquar. "Dynamic characteristics of a shock absorber module." ATZ worldwide 111, no. 5 (May 2009): 28–35. http://dx.doi.org/10.1007/bf03225071.

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Song, Da Feng, Gong Ke Yang, and Chun Xiao Du. "Research on Damping Properties of Seperated and Manually Adjustable Shock Absorber Oriented to Damping Matching." Advanced Materials Research 694-697 (May 2013): 36–40. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.36.

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On the basis of the structure characteristics of the seperated manually adjustable damper and its working principles, establish the shock absorber mathematical model, at the same time, get test data and curves of seperated manually adjustable shock absorber damping characteristics by bench test. Use MATLAB to simulate the characteristic curve of the speed of the shock absorber based on the mathematical model. The simulation curves and experimental curves were compared to verify the correctness and accuracy of the model. Further simulation and analysis affect of parts of structural changes on the damping characteristics. In order to provide a theoretical basis to structural parameters designing and vehicle damping matching.

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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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Sun, Peng, Jian Feng Wang, and Feng Feng. "A New Kind of Semi-Active Suspension Magnetorheological Fluid Shock Absorber Damping Force Model." Advanced Materials Research 549 (July 2012): 856–60. http://dx.doi.org/10.4028/www.scientific.net/amr.549.856.

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Based on the damping characteristics, design a kind of magnetic fluid shock absorber, and the damping force theory formula, derived from the damping force of the formula can be that, according to the design of shock absorber, in the vehicle suspension on the dynamic performance simulation test for the damping-displacement characteristic and speed characteristics is verified by experiments, the proof is in the formula of the damping force of the damping force and the polarization current into nonlinear (secondary) relationship is reasonable, to design the actual shock absorber to really have a certain reference value.Intorduction

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Konieczny, Łukasz, and Rafał Burdzik. "The use of a continuous wavelet transform in the diagnostics of technical condition of a shock absorber built in automotive vehicle." WUT Journal of Transportation Engineering 121 (June 1, 2018): 171–79. http://dx.doi.org/10.5604/01.3001.0014.4592.

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Diagnosing the technical condition of shock absorbers installed in automotive suspensions is a difficult issue due to the fact that these are elements of a complex mechanical system containing elastic and damping elements with nonlinear characteristics that degrade during operation. The paper presents the result of testing car with shock absorbers with programmed faults on the harmonic stand. The test object was a Fiat Seicento passenger car. The research experiment consisted in stimulating the vehicle to vibrations of forced masses, unsprung and sprung, and registration of vibration accelerations of these masses. The tests were subjected to shock absorbers with programmed faults in the form of loss of shock absorber fluid from 100% to 35% for rear shock absorbers. The acceleration of plates, swingarm (unsprung masses) and bodywork (sprung masses) were recorded by acceleration sensors. The results obtained in this way were subjected to wavelet analysis using the Morlet wavelet in the MatLab environment and based on these transformations the maximum of vibration amplitudes were determined depending on the degree of loss of the shock absorber fluid.

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Sidorenko, І., І. Prokopovych, M. Korolkova, S. Dmitrieva, and S. Kovban. "PERFORMANCE CHARACTERISTICS OF THE LEVER-VAN SHOCK ABSORBER WITH THE HINGE-LEVER CONTROL MECHANISM." Odes’kyi Politechnichnyi Universytet Pratsi 3, no. 62 (December 2020): 39–47. http://dx.doi.org/10.15276/opu.3.62.2020.05.

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The article presents a fundamentally new example of a passive lever-blade shock absorber with an articulated lever mechanism for controlling its operating characteristic, the use of which is effective as part of the torsion bar suspension of a tracked vehicle. The efficiency of the presented device is significantly increased by scientifically substantiated expansion of its mechanical structure with an additional controlling mechanical structure in the form of a pivot-lever mechanism. The developed structural scheme and the corresponding generalized mathematical model of the proposed device are presented. Based on the developed generalized mathematical model, analytical studies have been carried out, on the basis of which mathematical expressions have been obtained that describe the functional interaction between the constituent elements of the proposed lever-blade damper and their influence on the type of working characteristics that is realized in this case. A comparative analysis of the obtained performance with the performance that can be implemented using existing lever-blade shock absorbers is carried out. It was found that the proposed device is able to realize working characteristics that cannot be realized using known samples of passive lever-blade and lever-piston shock absorbers. The basic geometric parameters of both the main mechanical structure of the proposed device and the additional mechanical control structure, the variation of which allows reproducing the target (needed under certain conditions) working characteristics, are highlighted and substantiated. The directions and prospects of further research are given, which make it possible to increase the efficiency of the lever-paddle shock absorber with the articulated-lever control mechanism.

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Liu, Hongtuo, Fangwei Xie, Kai Zhang, Xinxing Zhang, Jin Zhang, Cuntang Wang, and Hao Li. "Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber." International Journal of Structural Integrity 9, no. 1 (February 5, 2018): 27–37. http://dx.doi.org/10.1108/ijsi-03-2017-0017.

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Purpose The shock absorber is an important component of vehicle suspension that attenuates the vehicle vibration. Its running state directly affects the performance of the vehicle suspension. The purpose of this paper is to quantitatively study the relationship between damping characteristics and air chamber and oil properties in single-tube pneumatic shock absorber. Design/methodology/approach Combined with the principle of fluid dynamics and hydraulic transmission technology, the rebound stroke and compression stroke mathematical models, and damping characteristics simulation model are established to investigate the effect of the air chamber and oil property on damping characteristics. Findings Research results show that the initial pressure of the air chamber is the key parameter which influences the damping characteristics of the shock absorber. The change of the initial pressure has more impact on damping force, and less impact on the speed characteristic; the initial volume of the air chamber almost has no effect on the damping characteristics. The density and viscosity of the oil have certain influence on the damping characteristics. Therefore, selecting suitable damping oil is very important. Originality/value Using Matlab/Simulink software to build simulation models, its results are very accurate. The conclusions can provide a theoretical reference for the structure design of a single-tube pneumatic shock absorber.

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Liu, Chao Fu. "Finite Element Analysis of the Shock Absorber for Vehicle." Advanced Materials Research 706-708 (June 2013): 1361–64. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1361.

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As for the structural features and the characteristics of fiber-reinforced rubber of a shock absorber for vehicle, this paper mainly focuses on its deformation and static characteristic analysis. A shock absorber whose type is JW2-5202 was analyzed in its performance characteristics of deformation with variations in cord elastic modulus and cord angle. According to the finite element analysis on the load vs. the displacement, and the internal pressure vs. the displacement, the results are in accordance with the test ones.

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A., Al-Maqtri, Hegazy A., and Hossamel-deen H. "Shock absorber characteristics representations and vehicle performance evaluation." International Conference on Applied Mechanics and Mechanical Engineering 12, no. 12 (May 1, 2006): 369–82. http://dx.doi.org/10.21608/amme.2006.41184.

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Yang, Xin, Xiao Yu Guo, and Ming Liang Ding. "The Design of Shock Absorbers for Chemical Equipments." Advanced Materials Research 479-481 (February 2012): 1283–87. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1283.

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A low cost shock absorber easy to install and tune was designed to solve the vibration problem produced by the compressor in chemical process. By establishing the mathematical model of the dynamic shock absorption, the shock absorber characteristics were analyzed theoretically. The preliminary experiment was conducted on the testing platform to simulate the factory conditions. The shock absorber was then installed on the compressor for the field validation. Testing results agree well with theory and the shock absorber showed good damping performance.

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Velychkovych, A. "Numerical model of interation of package of open shells with a weakly compressible filler in a friction shock absorber." Engineering Solid Mechanics 10, no. 3 (2022): 287–98. http://dx.doi.org/10.5267/j.esm.2022.3.002.

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The problems of protecting equipment, structures and operators from the harmful effects of vibrations are among the most painful topics of modern mechanical engineering. In this research an original design of a friction shock absorber is presented in which the principle of operation is based on the contact interaction of a package of open shells with weakly compressible deformable filler. The proposed design is simple and technologically advanced, suitable for operation under high dynamic loads and at the same time has a compact transverse dimension. Such shock absorbers are projected to be used in the mining and oil and gas industries. A finite element model of a friction shock absorber with two contact pairs has been constructed: the first contact pair is "filler - package of open shells"; the second contact pair is "inner shell of the package - outer shell". The contacting bodies were presented as separate arrays of finite elements and the conditions of frictional interaction on the contact surfaces were set in the form of Coulomb's law. We considered the behavior of such a structurally nonlinear system under the action of a monotonic and nonmonotonic load. In the course of the study, the main operational characteristics of the shock absorber including the strength, rigidity, hysteresis characteristics and natural frequencies were determined. The possibility of adjusting the rigidity and shock-absorbing characteristics of the proposed device is discussed.

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Korolchenko, Dmitry, Vasily Vasilenko, and Georgy Lelikov. "Problems of the dynamic test method for individual protection equipment (shock absorbers)." MATEC Web of Conferences 193 (2018): 05034. http://dx.doi.org/10.1051/matecconf/201819305034.

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This paper examines issues of safety of high-altitude works, using individual protection equipment to prevent falling from a height. In particular, the paper reviews personal protective equipment - shock absorber, its dynamic characteristics and related test methods to meet the requirements of Technical Regulations 019/2011 “Safety of Individual Protection Equipment”. The paper discusses the differences between the Russian and European standards for dynamic characteristic testing of shock absorbers, even as the former are harmonized texts of the latter, and the effect of such differences on protective performance of shock absorbers and ultimately on safety of works on heights. It have been shown that tests, conducted in accordance with the Russian regulative documents for dynamic performance of the shock absorbers, entail decreasing in safety usage of such type of IPE and increasing in injuries during falls from a height. It has been defined necessity to actualize the range of the testing system of shock absorbers, and to admit its larger value that will cause increase in protective properties of shock absorbers.

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Diveev, Bogdan. "Vibration impact and noise protection devices with DVA for wheeled vehicles." Transport technologies 2020, no. 2 (November 9, 2020): 65–75. http://dx.doi.org/10.23939/tt2020.02.065.

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The article investigates vibration and noise protection devices for wheeled vehicles using dynamic vibration absorbers (DVA). Algorithms for modeling their dynamic characteristics based on adaptive calculation schemes are presented. A non-linear suspension with DVA and a noise-absorbing partition is considered, which is due to the introduction of a layered composite thin-walled structure with an intermediate damping layer with high damping properties and a DVA system, which provides better vibration and noise absorption. The problems of shock propagation during the overturn of the bus to passengers are also considered. The influence of the parameters of the shock absorber on the dynamic properties of the bus is investigated. The optimal parameters of the shock absorber are determined.

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Voytko, A. M. "Method for calculating the speed characteristicsof a single-tube shock absorber." Вестник гражданских инженеров 17, no. 2 (2020): 168–72. http://dx.doi.org/10.23968/1999-5571-2020-17-2-168-172.

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The article describes a method for calculating the speed characteristics of a single-tube hydro-pneumatic shock absorber developed by the author based on the use of basic approaches to the calculation of damping hydraulic systems. A regressive type of characteristic is substantiated in relation to the operating conditions of a specialized vehicle in urban conditions. There has been performed calculation and analysis of the speed characteristics of the hydro-pneumatic shock absorber proposed for use on Ford Transit ambulances.

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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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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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31

Liu, Qiang, Zhi Bin Chang, and Guo Xing Sun. "Study on the Performance Simulation of a Kind of Height-Adjusting Shock Absorber." Advanced Materials Research 468-471 (February 2012): 2569–72. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.2569.

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Structure characteristics and operational principle of height-adjusting shock absorber are introduced and mathematical model is also established. According to the model, simulation program is organized. There comes the damping curve of height-adjusting shock absorber.

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SHIOZAKI, Hidetaka, Toshihiko ASAMI, and Itsuro HONDA. "Effect of orifice on damping characteristics of shock absorber." Proceedings of the Fluids engineering conference 2019 (2019): OS10–03. http://dx.doi.org/10.1299/jsmefed.2019.os10-03.

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33

Ohkubo, Toshiaki, Yasufumi Sakakibara, and Yutaka Yamada. "Characteristics of Spring-Type Shock Absorber for Water Hammer." Transactions of the Japan Society of Mechanical Engineers Series B 60, no. 569 (1994): 183–89. http://dx.doi.org/10.1299/kikaib.60.183.

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34

Wu, Zhifei, Guangzhao Xu, Hongwei Yang, and Mingjie Li. "Analysis of Damping Characteristics of a Hydraulic Shock Absorber." Shock and Vibration 2021 (February 26, 2021): 1–10. http://dx.doi.org/10.1155/2021/8883024.

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In the present study, a hydraulic shock absorber is proposed. Since the damper is mainly used in suspension energy recovery system, the damping characteristics of the damper under no-load state are studied in this paper. Structural design is conducted so that the unidirectional flow of the oil drives the hydraulic motor to generate electricity. Meanwhile, an asymmetrical extension/compression damping force is obtained. A mathematical model of the shock absorber is established, and the main characteristics of the inherent damping force are obtained. Based on the established model, effects of the accumulator volume, accumulator preinflation pressure, hydraulic motor displacement, check valve inner diameter, and spring stiffness, hydraulic line length and inner diameter on the indicator characteristics are analyzed. Moreover, a series of experiments are conducted on the designed damper to evaluate the characteristics of the inherent damping force and analyze the effect of the accumulator volume and preinflation pressure on the damping characteristics.

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35

Lee, Choon-Tae, and Byung-Young Moon. "Study of the simulation model of a displacement-sensitive shock absorber of a vehicle by considering the fluid force." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 219, no. 8 (August 1, 2005): 965–75. http://dx.doi.org/10.1243/095440705x34685.

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In this study, a new mathematical dynamic model of a displacement-sensitive shock absorber (DSSA) is proposed to predict the dynamic characteristics of an automotive shock absorber. The performance of a shock absorber is directly related to the vehicle behaviour and performance, for both handling and ride comfort. The proposed model of the DSSA is considered as two modes of the damping force (i.e. soft and hard) according to the position of the piston. In addition, the DSSA is analysed by considering the transient zone for more exact dynamic characteristics. For the mathematical modelling of the DSSA, flow continuity equations at the compression and rebound chamber are formulated. The flow equations at the compression stroke and rebound stroke respectively are formulated. Also, flow analysis of the reservoir chamber is carried out. Accordingly, the damping force of the shock absorber is determined by the forces acting on both sides of the piston. The characteristics of the damping force are observed by the proposed method. The analytical results of the damping force characteristics are compared with the experimental results to prove the effectiveness. In particular, the effects of the displacement-sensitive orifice area on the damping force and the effects of the displacement-sensitive orifice length on the damping force are observed. The results reported herein will provide a better understanding of the shock absorber.

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Liang, Liang, Liang Tian, Yun Qing Zhang, and Jie Zhang. "Twin Tube Shock Absorber Thermo-Mechanical Coupling Simulation." Advanced Materials Research 566 (September 2012): 669–75. http://dx.doi.org/10.4028/www.scientific.net/amr.566.669.

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During the working process, temperature of the oil increases and its viscosity decreases due to the damping force, resulting in changes in operating characteristics of the shock absorber. This paper firstly analyzes the mechanism of themogenesis and heat transfer means of shock absorber in details, and then establishes the thermodynamic model of shock absorber with the energy conservation law and the first law of thermodynamics on this basis. After a comparison between the simulation results and the experimental results, causes of error will be analyzed. The study shows that the more influential correlations are the internal flow convection correlation used between the oil of the different chambers and the tubes of the shock absorber and the external flow convection correlation between the outside tube of the shock absorber and the ambient air.

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37

Guo, Xiaoqiang, Jun Liu, Guorong Wang, Qingyou Liu, and Xianming Song. "Investigation into the dynamic characteristics of downhole perforation tools with multiple shock absorbers." Mechanics & Industry 20, no. 6 (2019): 622. http://dx.doi.org/10.1051/meca/2019055.

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The use of large-charged perforating bullets after well perforation produces large impact loads, which can easily lead to early unsealing of packers, damage to testing instruments, stress failure of tubing strings, buckling deformation, and other adverse incidents. This study focuses on the safety of large-charged perforating bullets used in downhole tools. In addition, a dynamic model of downhole perforation tools with multi-shock absorber was designed, and ANSYS software was used to validate its accuracy. Perforation impact loading field experiments were developed, and the loading pressure was measured over time to obtain an even more accurate equation to calculate loading. Analysis of the effects of different numbers of shock absorbers on the dynamic characteristics of downhole tools was conducted, finding that increasing the number of shock absorbers from one to two significantly decreased the dynamic response amplitude of the downhole tools (displacement, axial force, and packer force). However, when the number was increased to three, the change in response amplitude was not significant. Based on the maximum acceleration of each section of the tubing string, the testing instrument is best installed at its upper end. As the number of shock absorbers is increased, the number of regions of the tubing string that undergo buckling deformation decreases. Increasing the number of shock absorbers helps prevent buckling deformation in the tubing string, and increases its service life.

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38

Konieczny, Łukasz. "Analysis of Simplifications Applied in Vibration Damping Modelling for a Passive Car Shock Absorber." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/6182847.

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The paper presents results of research on hydraulic automotive shock absorbers. The considerations provided in the paper indicate certain flaws and simplifications resulting from the fact that damping characteristics are assumed as the function of input velocity only, which is the case of simulation studies. An important aspect taken into account when determining parameters of damping performed by car shock absorbers at a testing station is the permissible range of characteristics of a shock absorber of the same type. The aim of this study was to determine the damping characteristics entailing the stroke value. The stroke and rotary velocities were selected in a manner enabling that, for different combinations, the same maximum linear velocity can be obtained. Thus the influence of excitation parameters, such as the stroke value, on force versus displacement and force versus velocity diagrams was determined. The 3D characteristics presented as the damping surface in the stoke and the linear velocity function were determined. An analysis of the results addressed in the paper highlights the impact of such factors on the profile of closed loop graphs of damping forces and point-type damping characteristics.

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Su, Wei Hua, Jing Gong Sun, and Fu Niu. "Test and Analysis of Steel Cable Isolator for Medical Equipments in Field Vehicle." Advanced Materials Research 655-657 (January 2013): 644–47. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.644.

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Medical equipment systems are precision system. There are some vibrations and impact in field vehicles from road or field environments. Therefore, shock absorber is significant in protection of medical equipment in moving vehicles. The objective of this paper is to provide a systematic investigation to design or evaluation of a shock absorber for protection of medical equipment system in harsh vibration-impact environment. A novel wireless damping shock absorber is designed and manufactured through coupling friction and spring. The physical mechanism of a prototype shock absorber is systematically investigated by dynamic test. A nonlinear dynamic model for the shock absorber is presented by analyzing the internal frictional dynamic phenomenon with respect to the prototype. Comparisons between experimental data confirm the validity of the model. In the meantime, evaluation of the importance of some key factors by using the mathematical model for designing is discussed. It shows amplitude and frequency of excitation, as well as ratio of damping area are the key factors to ensure the performances of the shock absorber. The change of these factors will change the working characteristics and performances of the shock absorber.

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40

Gerdemeli, Ismail, A. Engin Cotur, Eren Kayaoglu, and Adem Candas. "Computer Aided Valve Design of Shock Absorbers Used in Vehicles." Key Engineering Materials 486 (July 2011): 270–73. http://dx.doi.org/10.4028/www.scientific.net/kem.486.270.

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The valve design of a rear twin tube shock absorber belongs to a light commercial vehicle whose damper characteristics already known has been realized by the help of a computer program called “Dr”, and compared with the actual application results. The program gives user results about the valve parts to get the right target characteristics. After obtaining the necessary parts’ results, the needed damping performance test has been performed by the shock absorber, which has been conflated according to the program. The actual results and target characteristics were compared. ”Dr” program enables the user to select the correct parts to be used in valve system by detecting every effect on target characteristics diagram. By comparing the overall effect of the parts selected, shock absorber valve system is conflated according to the valve components obtained from the computer program.

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41

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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42

Zhu, Zhubing, Lingxin Zhang, Yongfeng Cheng, Hulun Guo, and Zhicheng Lu. "On the Nonlinear Seismic Responses of Shock Absorber-Equipped Porcelain Electrical Components." Mathematical Problems in Engineering 2020 (May 15, 2020): 1–15. http://dx.doi.org/10.1155/2020/9026804.

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Porcelain electrical equipment is prone to brittle failure due to resonance under seismic effects. To improve its seismic resistance, some researchers have conducted research on shock absorption technology for porcelain electrical equipment. However, extant research fails to provide a detailed and systematic study of the effect of the nonlinear characteristics of these shock absorbers on the performance of equipment under seismic effects. This paper provides a theoretical analysis, verified by shaking table testing, of the performance of a 1000 kV pillar-type porcelain lightning arrester. The Bouc–Wen model is fitted to the force-displacement curve of hysteretic nonlinear metal shock absorbers, and a dynamic model of, and equations for, pillar-type porcelain electrical components are derived, taking into account their nonlinear characteristics. This reveals the influence of the nonlinear characteristics of shock absorbers on the nonlinear seismic response characteristics of these components. Our results indicate that the seismic responses of pillar-type porcelain components can be effectively suppressed by hysteretic nonlinear shock absorbers and that the greater the intensity of the seismic waves, the more obvious the efficiency of shock absorption. However, as the installation radius and yield force of the installed shock absorbers increase, their shock absorption efficiency gradually decreases.

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43

Shen, Ji Sheng, Xiang Man Ye, and Xiao Bin Ning. "Dynamic Analysis of Self-Energizing Shock Absorber of Suspension for Energy-Regenerative." Applied Mechanics and Materials 80-81 (July 2011): 746–51. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.746.

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Design of self-energizing shock absorber of suspension of SVU, a multi degree of freedom mechanism, is a challenge. In order to decay vibration and recycle energy, self-energizing shock absorber was researched. This paper primarily focuses on kinematics and dynamic analysis in multi-body system (MBS) and validation of system. A simulation model for self-energizing shock absorber was built using the software MATLAB, and the establishment of this model was based on the analysis of internal configuration and characteristics of valves. Vehicle simulation model was built using MBS. The assembly between vehicle simulation model and the shock absorber was realized through co-simulation between MBS and MATLAB. The optimal design of suspension is investigated, in order to improve vertical ride and road-friendliness of vehicles, while maintaining enhanced roll stability. A nonlinear vehicle model is developed to study vertical as well as roll dynamics of vehicles. The simulation results shows that suspension with self-energizing shock absorber can partly energy-regenerative which can be used to adjust ride height due to load change of automobile. Self-energizing shock absorber is also improving the ride performance of vehicle.

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Lu, Yongjie, Shaohua Li, and Na Chen. "Research on Damping Characteristics of Shock Absorber for Heavy Vehicle." Research Journal of Applied Sciences, Engineering and Technology 5, no. 3 (January 21, 2013): 842–47. http://dx.doi.org/10.19026/rjaset.5.5030.

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45

Larin, O. O., and Y. Y. Beskrovnyi. "Analysis of the Elastic Characteristics of a Pneumatic Shock Absorber." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines 1, no. 38 (December 20, 2018): 60–63. http://dx.doi.org/10.20998/2078-9130.2018.38.152606.

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46

Iqbal, Muhammad Yousaf, Zhifei Wu, Guangzhao Xu, and Syed Arslan Bukhari. "Study of External Characteristics of Hydraulic Electromagnetic Regenerative Shock Absorber." World Journal of Engineering and Technology 07, no. 03 (2019): 520–35. http://dx.doi.org/10.4236/wjet.2019.73037.

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Tang, Xia Qing, Jun Qiang Gao, Li Bin Guo, and Huan Zhang. "Study on Dynamics Characteristics of SINS Damping System in Shock Environment." Applied Mechanics and Materials 397-400 (September 2013): 355–58. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.355.

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Dynamics characteristics of SINS damping system in shock environment were analyzed by finite element method, as the deformation of dampers may leads to the accuracy loss of SINS. In addition, the influence of absorber stiffness and damping coefficient on dynamics characteristics were studied. The results indicate that the decoupling of vibrations is significant for the accuracy of SINS. However, considering the almost impossible of completely decoupled vibrations, its necessary to carry out an optimal design of the absorber stiffness and damping coefficient to maintain the accuracy of SINS while meeting the requirement of vibration isolation.

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48

SHIOZAKI, Hidetaka, Toshihiko ASAMI, and Itsuro HONDA. "Evaluation of Unsteady Flow Characteristics and Damping Characteristics of Orifice in Shock Absorber." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): S05507P. http://dx.doi.org/10.1299/jsmemecj.2019.s05507p.

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Ning, Xiao Bin, Cui Ling Zhao, and Ji Sheng Shen. "Simulation Research for Self-Energizing Leveling Systems." Advanced Materials Research 211-212 (February 2011): 494–99. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.494.

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In order to decay vibration and recycle energy, the shock absorber that is self-energizing leveling systems was researched. The co-simulation method was adopted. A mathematical model for the shock absorber was built using the software MSC.EASY5, and the establishment of this model was based on the analysis of internal configuration and characteristics of valves. Debugging simulation of this model was also conducted. Vehicle simulation model was built using MSC.ADAMS. The assembly between vehicle simulation model and the shock absorber was realized through co-simulation between ADAMS/CAR and MSC.EASY5. After the integration of the full vehicle model the road test simulation with the input of random road surface signal was conducted. The simulation results shows that self-energizing leveling systems can partly recycle this energy which can be used to adjust ride height due to load change of automobile. This shock absorber is improving the ride performance of vehicle.

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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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Journal articles on the topic 'Shock absorber characteristics'

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