Journal articles: 'Pneumatic suspension system'

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Boopathi, M., S. R. Gauthamnithin, and S. Harikrishnan Prof Dr G. Kumaresan. "Hydro-Pneumatic Suspension with Intelligent Active Suspensioning System." International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (April 30, 2018): 436–40. http://dx.doi.org/10.31142/ijtsrd10916.

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Liu, P. J., S. Rakheja, and A. K. W. Ahmed. "PROPERTIES OF AN INTERCONNECTED HYDRO-PNEUMATIC SUSPENSION SYSTEM." Transactions of the Canadian Society for Mechanical Engineering 19, no. 4 (December 1995): 383–96. http://dx.doi.org/10.1139/tcsme-1995-0020.

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The static and dynamic properties of a vehicle suspension comprising hydraulic struts interconnected in the roll plane are investigated. The fundamental properties of the interconnected suspension are investigated and compared to those of the unconnected suspensions with and without the anti-roll bar, in terms of load-carrying capacity, suspension rate, roll stiffness as well as damping characteristics. The anti-roll performance of the interconnected suspension is analyzed for excitations encountered during directional manoeuvres. The ride quality performance is evaluated for excitations occurring at tire-road interface. It is concluded that the interconnected hydro-pneumatic suspension with inherent enhanced roll stiffness and damping characteristics can significantly restrict the body roll motion to achieve improved roll stability of a vehicle.

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Morales, Angel L., Antonio J. Nieto, José M. Chicharro, and Publio Pintado. "A semi-active vehicle suspension based on pneumatic springs and magnetorheological dampers." Journal of Vibration and Control 24, no. 4 (June 7, 2016): 808–21. http://dx.doi.org/10.1177/1077546316653004.

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Semi-active and active suspensions can improve both ride comfort and handling compared to passive suspensions. The authors have proposed a suspension comprising a pneumatic system capable of changing the stiffness of the suspension and a semi-active magnetorheological damper capable of controlling the suspension damping. Eight configurations of this magnetorheological/pneumatic suspension result from combining two possible stiffnesses (compliant and stiff) and four possible means of producing damping (constant low, constant high, on-off skyhook control and on-off balance control). The minimization of a cost function, which considers both ride comfort and handling, leads to decision maps which indicate the most appropriate configuration depending on vehicle velocity and two pieces of information about the road: the international roughness index and the curve radius. All this information can be gathered from a GPS system and toggling between set-ups is fast, efficient, and easily done by simply opening or closing pipes in the pneumatic system and modifying the current supply in the magnetorheological dampers. The proposed magnetorheological/pneumatic suspension achieves the same roll angle levels as in a comparable passive vehicle while improving ride comfort by reducing acceleration by up to 30%.

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Raine, J. K., and R. J. Henderson. "A two-degree-of-freedom ambulance stretcher suspension Part 1: System overview." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 212, no. 2 (February 1, 1998): 93–102. http://dx.doi.org/10.1243/0954407981525821.

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Ambulance suspensions often give a poor ride, which may result in deterioration in the condition of ill or injured patients. Suspension of the ambulance stretcher itself is a lower cost option than a purpose- built ambulance suspension and may offer superior isolation of the patient from road-induced disturbances. This paper describes the development of a pneumatic stretcher suspension offering both pitch and heave isolation. Design and theoretical considerations are outlined, and preliminary performance figures reported. Subsequent parts of this paper will explore the dynamics of the system with pneumatic damping and report on the performance of the prototype suspension for a range of patient masses, damping levels and floor vibration inputs.

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Gorabal, S. V., S. N. Kurbet, and K. K. Appukuttan. "Design and Evaluation of Hydro-Pneumatic Friction Damper Suspension System." International Journal of Manufacturing, Materials, and Mechanical Engineering 1, no. 4 (October 2011): 65–74. http://dx.doi.org/10.4018/ijmmme.2011100105.

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Perceived comfort level and ride stability are the two most important factors in the evaluation of suspension system in a mobile vehicle. It is extremely difficult to simultaneously maintain a high standard of vehicle ride, handling and body control in the vehicle by using conventional passive suspension system. However, the use of active suspensions would result in better comforts than the passive ones. This paper presents the design and analysis of a pneumatic friction damper and hydro-pneumatic friction damper. A non-linear quarter car model is developed, which includes pneumatic actuation by pressure regulation. The performance of the proposed model was assessed in terms of level of vibration reduction. Simulations on a prototype model show that the proposed system has good performance and robustness.

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Song, Yong, Shichuang Liu, Jiangxuan Che, Jinyi Lian, Zhanlong Li, and Qinglu Shi. "A Pneumatic Artificial Muscle Bionic Kangaroo Leg Suspension." Recent Patents on Mechanical Engineering 12, no. 4 (December 26, 2019): 357–66. http://dx.doi.org/10.2174/2212797612666190808100422.

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Background: Vehicles generally travel on different road conditions, and withstand strong shock and vibration. In order to reduce or isolate the strong shock and vibration, it is necessary to propose and develop a high-performance vehicle suspension system. Objective: This study aims to report a pneumatic artificial muscle bionic kangaroo leg suspension to improve the comfort performance of vehicle suspension system. Methods: In summarizing the existing vehicle suspension systems and analyzing their advantages and disadvantages, this paper introduces a new patent of vehicle suspension system based on the excellent damping and buffering performance of kangaroo leg, A Pneumatic Artificial Muscle Bionic Kangaroo Leg Suspension. According to the biomimetic principle, the pneumatic artificial muscles bionic kangaroo leg suspension with equal bone ratio is constructed on the basis of the kangaroo leg crural index, and two working modes (passive and active modes) are designed for the suspension. Moreover, the working principle of the suspension system is introduced, and the rod system equations for the suspension structure are built up. The characteristic simulation model of this bionic suspension is established in Adams, and the vertical performance is analysed. Results: It is found that the largest deformation happens in the bionic heel spring and the largest angle change occurs in the bionic ankle joint under impulse road excitation, which is similar to the dynamic characteristics of kangaroo leg. Furthermore, the dynamic displacement and the acceleration of the vehicle body are both sharply reduced. Conclusion: The simulation results show that the comfort performance of this bionic suspension is excellent under the impulse road excitation, which indicates the bionic suspension structure is feasible and reasonable to be applied to vehicle suspensions.

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Oh, Jooseon, Woo-Jin Chung, Hyun-Woo Han, Ji-Tae Kim, Gwan-Hee Son, and Young-Jun Park. "Evaluation of Tractor Ride Vibrations by Cab Suspension System." Transactions of the ASABE 63, no. 5 (2020): 1465–76. http://dx.doi.org/10.13031/trans.13795.

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HighlightsTractor ride vibrations were evaluated under various conditions according to type of cab suspension.Ride vibrations were measured on flat and bumpy roads using four tractors with different cab suspension types.Tractors with hydro-pneumatic suspension exhibited smaller ride vibrations than tractors with rubber mounts.Semi-active hydro-pneumatic control resulted in smaller ride vibrations than those resulting from passive control.Abstract. In this study, tractor ride vibrations were evaluated under various conditions according to the type of cab suspension, and the effects of different cab support methods on these ride vibrations were determined. Ride vibrations on flat and bumpy roads were measured using four tractors equipped with different cab suspension types and were analyzed based on ISO Standard 2631-1 for human exposure to whole-body vibration. The ride vibration values were evaluated using the weighted root mean square acceleration and fourth-power vibration dose value. The results confirmed that the tractor equipped with semi-active hydro-pneumatic cab suspension at the two rear positions yielded smaller ride vibrations than the tractors with rubber mounts at all four positions. Vibration reduction effects of up to 53.8% and 67.1% were yielded in the flat road test and bumpy road test, respectively. In addition, among the two tractors with hydro-pneumatic cab suspension systems, ride vibrations were reduced by approximately 7.1% in the tractor that used semi-active control as compared to the tractor that used passive control. Keywords: Hydro-pneumatic cab suspension, Ride vibration, Rubber mount, Whole-body vibration.

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Kuz'min, V. A., and Z. A. Godzhaev. "Comparative evaluation of the effectiveness of the vibration protection of the active suspension system with PID control." Traktory i sel hozmashiny 85, no. 3 (June 15, 2018): 62–67. http://dx.doi.org/10.17816/0321-4443-66407.

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The pneumatic suspension is used to absorb vibration and provide comfortable labor conditions for transportation vehicle drivers. The cause of increased vibration of the tractor, often, are incorrectly matched elastic-damping characteristics of the cushions of the active suspension system, which can not cope (or cope extremely ineffectively) with fluctuations coming from the external background. Since the realization of an experiment for the dynamic analysis of pneumatic suspension takes a long time, the mathematical models of the vehicle suspension system are used to obtain the response parameters of the pneumatic suspension. In the given article the comparative characteristic of spring’s systems with a cylindrical spring and a linear pneumatic spring as a suspension system is given. To carry out the simulation, the Matlab/Simulink software complex was used, in which, based on the previously obtained values of equivalent rigidity, a simulation of the tractor was built. Since the tractor in this model is considered as a linear system, its spectral function was calculated from the spectrum of the input parameters of the path unevenness and the frequency response of the tractor. These parameters were used to analyze the vibration response of the suspension system to assess the effectiveness of the system and, as a result, assessment of the operator comfort. The algorithm of the proportional integral differentiating (PID) regulation of the suspension system was implemented depending on their output parameters as well. The comparative study shows how the linear model of the pneumatic suspension system controlled by a PID-regulator is able to suppress fluctuations arising from road roughness and whether it is effective than a passive suspension system for a vehicle with a coil spring. The criterion of efficiency in this work was the indicator of the tractor's displacement height.

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Xing, Bang Sheng, Ning Ning Wang, and Le Xu. "Study on Nonlinear Damping Properties of Hydro-Pneumatic Suspension System for XP302-Pneumatic Tyred Roller." Advanced Materials Research 945-949 (June 2014): 987–91. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.987.

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The nonlinear stiffness and damping properties of the hydro-pneumatic suspension system are introduced, and the nonlinear mathematical model of it is established. Using MATLAB 2009b to establish the computer simulation program and draw out the nonlinear stiffness curve and damping properties curve of the hydro-pneumatic suspension system. Then, researching the influences of related parameters' changes on the nonlinear stiffness and damping properties of the hydro-pneumatic suspension system. The simulation of vehicle dynamic performance research's foundation is provided.

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El-Tawwab, Ali M. Abd. "Advanced Hydro-Pneumatic Semi-Active Suspension System." Journal of Low Frequency Noise, Vibration and Active Control 20, no. 2 (June 2001): 93–103. http://dx.doi.org/10.1260/0263092011493190.

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Woś, Piotr, and Ryszard Dindorf. "A pneumatic semi-active seat suspension." Mechanik 90, no. 2 (February 6, 2017): 114–17. http://dx.doi.org/10.17814/mechanik.2017.2.30.

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Presented are issues related to improvement of the vibration isolating properties of semi-active seat suspension. It shows the practical implementation of the force control system for pneumatic spring which was mounted in mass-produced seat suspension. Output control function for pressure valve of pneumatic supply system was proposed. The developed solution allowed to carry out the research of air spring applied to a semi-active suspension system.

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Lyashenko, M. V., V. V. Shekhovtsov, and A. I. Iskaliev. "MATHEMATICAL MODEL OF A PNEUMATIC RELAXATION OF SEAT SUSPENSION WITH ENERGY RECUPERATION." Traktory i sel hozmashiny 84, no. 4 (April 15, 2017): 30–37. http://dx.doi.org/10.17816/0321-4443-66281.

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Simulink MatLAB, амплитудно-частотная характеристика. The paper proposes a mechanism and an algorithm for controlling a single-bearing pneumatic relaxation suspension system with energy recovery of oscillations applied to the standard seat of operator of Sibeko traction vehicle. Experimental studies of the static characteristic of a pneumatic suspension of a standard seat with a nonlinear elastic-damping characteristic have been performed. A mathematical model of a pneumatic relaxation seat suspension with two additional volumes of air is created, between which is installed an air motor - recuperator, which is activated by the flow of air from one additional volume to another. As a result of computational studies using the XY Graph Simulink MatLAB block-tool, the working elastic-damping characteristic of the simulated suspension system was obtained. The mathematical model, created taking into account the main provisions of theoretical mechanics and gas dynamics, realizes the concept of control of a single-bearing suspension system with a non-linear elastic-damping characteristic and absorption of vibrational energy at the end of compression and rebound strokes with a change in the direction of movement of the sprung mass. Calculation studies were carried out in the Simulink MatLAB software package. The working capacity of the mechanism and method of control of a single-bearing suspension system, realizing the necessary characteristic, has been confirmed. For the preliminary evaluation of the vibration-protective properties of the seat, amplitude-frequency characteristics of the transmission coefficients of the nominal and proposed suspensions were constructed. The performed comparative analysis of the amplitude-frequency characteristics revealed a noticeable improvement in the vibration protection of the pneumatic relaxation system of suspension with energy recovery of oscillations in comparison with the nominal one both in the region of resonant disturbances and in the resonant region. Based on the results of the analysis, the main directions for further improving the vibroprotective properties of the proposed suspension system are outlined.

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Henderson, R. J., and J. K. Raine. "Technical Note: A two-degree-of-freedom ambulance stretcher suspension: Part 3: Laboratory and road test performance." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 212, no. 5 (May 1, 1998): 401–7. http://dx.doi.org/10.1243/0954407981526055.

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Parts 1 and 2 of this paper gave a design overview and described the dynamics of a prototype two-degree-of-freedom pneumatic suspension for an ambulance stretcher. This concluding part briefly reviews laboratory shaker table and ambulance road test performance of the suspension with passive pneumatic damping. The suspension system is found to offer compact low-cost isolation with lower natural frequencies than achieved in earlier mechanical systems.

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Sun, Zhibo, Yan Shi, Na Wang, Jian Zhang, Yixuan Wang, and Shaofeng Xu. "Mechanism and Optimization of a Novel Automobile Pneumatic Suspension Based on Dynamic Analysis." Electronics 10, no. 18 (September 11, 2021): 2232. http://dx.doi.org/10.3390/electronics10182232.

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Pneumatic suspension is the most significant subsystem for an automobile. In this paper, a simplified and novel pneumatic spring structure with only a conical rubber surface is presented and designed to reduce the influence of external factors besides the pneumatic. The nonlinear stiffness of the pneumatic spring is analyzed based on the ideal gas model and material mechanics. Natural frequency analysis and the transmission rate of the pneumatic suspension are obtained as two effect criteria for the dynamic model. The vibration isolation system platform is established in both simulation and prototype tests. With the results from the simulation, the rules of the pneumatic suspension are analyzed, and the optimal function of mass and pressure is achieved. The experiment results show the analysis of the simulation to be effective. This achievement will become an important basis for future research concerning precise active control of the pneumatic suspension in vehicles.

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Henderson, R. J., and J. K. Raine. "A two-degree-of-freedom ambulance stretcher suspension, Part 2: Simulation of system performance with capillary and orifice pneumatic damping." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 212, no. 3 (March 1, 1998): 227–40. http://dx.doi.org/10.1243/0954407981525920.

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Part 1 of this paper gave an overview of the design and dynamics of a two-degree-of-freedom pneumatic stretcher suspension. Part 2 reviews pneumatic damping methods and then investigates system isolation performance using capillary and orifice damping restrictions. These restrictors are compared by numerical simulation of the suspension response when subjected to vertical transient inputs from the ambulance floor. Very good isolation of the stretcher patient is shown to be possible when a suitable damping restriction is used. Brief observations are also made regarding expected suspension performance in pitch and the potential improvement from introducing semi-active pneumatic damping. Part 3 will report results of suspension tests on a laboratory shaking table and in an ambulance.

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Sun, J. H., Zhi Song Gao, X. H. Shan, Li Zhang, and Yang Yu Wang. "On Pneumatic Installation Technology of Modal Testing Suspension System." Advanced Materials Research 69-70 (May 2009): 690–94. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.690.

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Modal testing is essential to correct the structure of dynamics model and optimize structure designs. First, the principle and the application of modal testing system are introduced in this paper. Then, through the theoretical calculation, the frequency of the air spring is achieved in this suspension system. And the influence of the baric fluctuation to the rigid suspension system is analyzed. In order to achieve an ultra low frequency request at 0.03Hz, methods of reducing the baric fluctuation are proposed here. Through the analysis, we successfully design a modal testing suspension system which can test the natural frequency of the samples below 0.1Hz. Experimental results show the baric fluctuation of the suspension system is lower than 20Pa.

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Zhang, Peng, Yongchao Li, and Pengzhen Li. "Dynamic Characteristics Analysis of Hydro-Pneumatic Suspension System." Journal of Computational and Theoretical Nanoscience 13, no. 9 (September 1, 2016): 5794–800. http://dx.doi.org/10.1166/jctn.2016.5490.

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Palomares, Eduardo, Angel L. Morales, Antonio J. Nieto, Jose M. Chicharro, and Publio Pintado. "Improvement of Comfort in Suspension Seats with a Pneumatic Negative Stiffness System." Actuators 9, no. 4 (December 3, 2020): 126. http://dx.doi.org/10.3390/act9040126.

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This paper presents a Negative Stiffness System (NSS) for vibration isolation and comfort improvement of vehicle seats, which enhances the performance of optimized traditional passive seat suspensions. The NSS is based on a set of two Pneumatic Linear Actuators (PLAs) added to a seat supported by a pneumatic spring. One end of each PLA is joined to the seat while the other end is joined to the vehicle frame. In static conditions, the PLAs remain horizontal, whereas in dynamic conditions, their vertical forces work against the pneumatic spring, reducing the overall dynamic stiffness and improving passenger comfort. The paper presents a stability analysis of the highly nonlinear dynamic system, as well as the numerical determination of the optimum PLA pressure for a given passenger mass that maximises comfort without instabilities. Finally, the performance of the proposed NSS is compared to that of a traditionally optimized passive seat suspension via simulations of an eight-degree-of-freedom vehicle model traversing several road profiles and speed bumps. Comfort improvements between 10% and 35% are found in all tests considered.

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Huang, Chung Neng, Kuo Han Chen, and David T. W. Lin. "Development of an Novel Adaptive Suspension System Based on Ball-Screw Mechanism." Applied Mechanics and Materials 477-478 (December 2013): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.128.

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For the passive and semi-active suspensions are characterized as with constant parameters which cannot cope with time-variant road conditions, the suspension results are difficult to be satisfied. Although, the active ones are better than previous two on suspension performance, until now which are still far from real application for the drawbacks of complicated structure, large volume, costly, and difficult maintenance. Here, Ball Screw (BS) is with the characteristics of smaller volume, precise positioning, and well handling high-speed forward and backward transmissions. Instead of hydraulic or pneumatic mechanisms used for vehicle suspension, BS is adopted to be the main body of the proposed New Adaptive Suspension System (NASS). Besides, in order to overcome the unavoidable time-delay resulted from mechanical or computational operations, the Kalman filter, integrated with suspension controller, is used to estimate the road conditions. The effectiveness and feasibility of this proposal are confirmed through simulation studies.

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Yang, L., Fan Yang, and M. B. Xia. "Modeling and Dynamic Analysis of a Novel Hydro-Pneumatic Suspension System." Applied Mechanics and Materials 772 (July 2015): 188–91. http://dx.doi.org/10.4028/www.scientific.net/amm.772.188.

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This study presents a modeling procedure and dynamic analysis for a novel hydro-pneumatic suspension system, in which the gas chamber has been integrated into the main structures. The modeling of the novel hydro-pneumatic suspension system has been established based on the mass conservation and force balance and the dimension has been obtained through a design optimization approach. The simulation results of the established model have been compared with those obtained through ADAMS, and good match can be observed.

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Демин, A. Demin, Исупов, S. Isupov, Хамитов, and R. Khamitov. "ELECTRO-PNEUMATIC ABSORBER IN THE VEHICLE SUSPENSION SYSTEMS." Alternative energy sources in the transport-technological complex: problems and prospects of rational use of 3, no. 1 (March 16, 2016): 0. http://dx.doi.org/10.12737/17932.

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The article shows the limited capacity of the traditional (passive) suspension systems to meet the constantly increasing requirements imposed on modern motor vehicles, as well as the expediency of application of controlled suspension systems. Modeling of processes in the system with the electromagnetic compensator stiffness in the free vibration mode in the software package Matlab Simulink.

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Pintado, P., C. Ramiro, A. L. Morales, A. J. Nieto, and J. M. Chicharro. "The dynamic behavior of pneumatic vibration isolators." Journal of Vibration and Control 24, no. 19 (September 13, 2017): 4563–74. http://dx.doi.org/10.1177/1077546317730243.

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The ubiquity of pneumatic vibration isolators, especially in heavy road vehicle suspensions and in passenger rail vehicle secondary suspensions, has boosted research interest in these systems. Thermodynamic models have been used in order to inform and support engineering design decisions. Most models assume that the air inside the system undergoes a polytropic transformation during the compression/expansion cycle, but the necessary polytropic index value is often guessed at and seldom measured. This paper presents measured polytropic indexes that contradict the traditional assumptions with respect to its value. On a different note, the work presented in this paper also investigates the air flow through the restrictor (a component that is often used in suspension applications to introduce damping and adapt the frequency response function). The results show that this flow can be analyzed with utterly simple models.

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Kushnir, V. G., O. A. Benyukh, I. N. Shilo, N. N. Romanyuk, and V. A. Ageychik. "Improvement of suspension system of mobile power units." Traktory i sel hozmashiny 81, no. 5 (May 15, 2014): 37–39. http://dx.doi.org/10.17816/0321-4443-65620.

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Original designs of pneumatic-tyre movers and vehicle suspension are proposed. Their use will permit to increase reliability, operation durability, ride comfort, and cross-country capability of machine and tractor unit; to improve operator work conditions; to decrease vertical vibration and dynamic loads on supporting surface as well as soil compaction.

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Sharp, R. S., and J. H. Hassan. "Performance Predictions for a Pneumatic Active Car Suspension System." Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering 202, no. 4 (October 1988): 243–50. http://dx.doi.org/10.1243/pime_proc_1988_202_181_02.

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A mathematical model of a pneumatic active car suspension system in a single wheel station form excited by realistic road roughness input is set up. The active control is exerted through a d.c. motor-driven air-pump. The model is used to show that essentially all the advantages of active control, within the terms of reference, are obtained by employing the control only at low frequencies and having the suspension parameters adapt to the running conditions as they vary. Control laws are derived using limited state feedback, linear stochastic optimal control theory and power consumption, and space requirements are evaluated. System performance is shown to be good in comparison with other known arrangements and encouragement for further work to extend the results is given.

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Bouvin, Jean-Louis, Xavier Moreau, André Benine-Neto, Alain Oustaloup, Pascal Serrier, and Vincent Hernette. "CRONE control of a pneumatic self-leveling suspension system." IFAC-PapersOnLine 50, no. 1 (July 2017): 13816–21. http://dx.doi.org/10.1016/j.ifacol.2017.08.2187.

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Sun, Huilai, Ruichuan Li, Jikang Xu, Funing Xu, Bo Zhang, and Xinyuan Dong. "Fractional Modeling and Characteristic Analysis of Hydro-Pneumatic Suspension for Construction Vehicles." Processes 9, no. 8 (August 16, 2021): 1414. http://dx.doi.org/10.3390/pr9081414.

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The motion differential equation of hydro-pneumatic suspension is established to describe the vibration characteristics for a certain type of construction vehicle. The output force was deduced from the suspension parameters. Based on the suspension characteristics of a multi-phase medium, fractional calculus theory was introduced, and its fractional Bagley–Torvik equation was formed. The numerical computation by a low-pass filter of the Oustaloup algorithm was performed. The numerical solution of a nonlinear fractional equation was obtained to investigate the vibration characteristics of the suspension fractional system. Through the building of an equal-ratio test platform and simulation model, the fractional- integer-order model simulation and experimental data were compared. When the fractional order is 0.9, it better describes the motion characteristics of suspension system. The experiments show that the experimental data can fit the fractional-order system model well, and thereby prove the model on a hydro-pneumatic suspension system.

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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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Woś, Piotr, and Ryszard Dindorf. "Studies of properties of the seat suspension system with air spring." EPJ Web of Conferences 213 (2019): 02101. http://dx.doi.org/10.1051/epjconf/201921302101.

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This article presents issues related to the study of the seat vibration isolating properties of the working machine. The spring force of the suspension system is realized by means of a pneumatic spring. The mathematical model of the air spring is presented. The results of research presented in the form of power spectral density of the vibration acceleration of the suspension system.

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Maciejewski, Igor, Tomasz Krzyzynski, and Henning Meyer. "Modeling and vibration control of an active horizontal seat suspension with pneumatic muscles." Journal of Vibration and Control 24, no. 24 (April 13, 2018): 5938–50. http://dx.doi.org/10.1177/1077546318763435.

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In the following paper, the dynamic modeling of a horizontal seat suspension which uses pneumatic muscles for the purpose of active vibration control is discussed. An original control system structure is proposed in order to improve the vibro-isolation properties of a horizontal seat suspension system. The presented control system design is based on inverse models of the pneumatic muscles and the primary controller that calculates the desired active force. By using the configurable control algorithm developed in this paper, it is possible to achieve a significant reduction in vibrations transmitted into the human body with just a slight increasing of the suspension travel. The active seat shows improved performance over the passive system in the 1–10 Hz frequency range. The results presented in this paper are useful in selecting the horizontal vibration control system for improving the comfort of a drive.

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Yang, Jue, Jun Feng Zhao, Yan Hua Shen, and Chen Yue Duan. "Influence of Variety of Oil Temperature on Performance of Hydro-Pneumatic Suspension." Applied Mechanics and Materials 40-41 (November 2010): 705–10. http://dx.doi.org/10.4028/www.scientific.net/amm.40-41.705.

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A test platform based on hydro-pneumatic suspension was set up to research the influence of temperature for the hydro-pneumatic suspension system. A series of experiments on damping holes of different diameters were carried out, and the temperature of oil and pressure on both sides of damping holes were recorded. A mathematical model of this platform was established using knowledge of fluid mechanics. The result of mathematical model was verified by experiments result, and the result is that oil temperature has little influence to working condition of suspension cylinder when it is between room temperature and 75°C.

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STEIN, G. J. "PRELIMINARY INVESTIGATIONS OF A NEW ACTIVE ELECTRO-PNEUMATIC SUSPENSION SYSTEM." Vehicle System Dynamics 29, sup1 (January 1998): 479–84. http://dx.doi.org/10.1080/00423119808969580.

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Pirouzi, Gholamhossein, Noor Azuan Abu Osman, Azim Oshkour, Sadeeq Ali, Hossein Gholizadeh, and Wan Wan Abas. "Development of an Air Pneumatic Suspension System for Transtibial Prostheses." Sensors 14, no. 9 (September 9, 2014): 16754–65. http://dx.doi.org/10.3390/s140916754.

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Bouvin, Jean-Louis, Xavier Moreau, Andr´e Benine-Neto, Vincent Hernette, Pascal Serrier, and Alain Oustaloup. "CRONE Body Control with a Pneumatic Self-leveling Suspension System." Journal of Applied Nonlinear Dynamics 8, no. 1 (March 2018): 79–96. http://dx.doi.org/10.5890/jand.2019.03.007.

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Anakwa, W. K. N., D. R. Thomas, S. C. Jones, J. Bush, D. Green, G. W. Anglin, R. Rio, J. Sheng, S. Garrett, and L. Chen. "Development and control of a prototype pneumatic active suspension system." IEEE Transactions on Education 45, no. 1 (2002): 43–49. http://dx.doi.org/10.1109/13.983220.

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35

Qu, Shengguan, Jiliang Lv, Rong Yin, and Xiaoqiang Li. "The Design and Simulation of Full Pneumatic Suspension Lifting System." IOP Conference Series: Materials Science and Engineering 381 (August 16, 2018): 012193. http://dx.doi.org/10.1088/1757-899x/381/1/012193.

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GOGIASHVILI, Phridon, David KBILASHVILI, Jumber CHOGOVADZE, Gocha LEKVEISHVILI, and Besik SIRBILADZE. "STUDYING THE DYNAMIC SYSTEM “TIRE-SUSPENSION-BODY” BY THE RESONANCE METHOD." Transport Problems 17, no. 1 (March 1, 2022): 63–72. http://dx.doi.org/10.20858/tp.2022.17.1.06.

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By comparing the results of a pilot study of the damping coefficient of a pneumatic tire carried out on a test bench, this study justifies the possibility of using the less time-consuming experimental resonance curve method instead of the dynamic loop method. A mathematical model of the vertical oscillations of avehicle’sdynamic system “pneumatic wheel-suspension-sprung weight”was created on the test-bench, and an image of the amplitude-frequency characteristic of the sprung weight oscillation was obtained. The approaches and results of the pilot and analytical studies presented in the article aid the selection of the tire with the best damping properties. The use of the experimental resonance curve method to determine the damping characteristic of a vehicle’s tire is limited in the external frequency range of the resonant frequencies. In this case, we have to use the dynamic loop method.

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Hou, You Shan, Hui Xin Song, and Chao Wang. "The Mechanical Characteristics Study on an Interconnected Anti-Rolling Suspension System." Advanced Materials Research 791-793 (September 2013): 676–80. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.676.

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The heavy-duty special vehicles easily roll during steering, anti-rolling technology becomes a critical technology to the heavy-duty vehicles. Aiming at the rolling problem of a full load heavy vehicle in the process of steering, an interconnected anti-rolling suspension system with adjustable damping was designed, the nonlinear mathematical models of both hydro-pneumatic independent suspension and interconnected anti-rolling suspension system were established. The mechanical characteristics of two kind of suspension were studied through digital simulation method, discussing the system parameter changes affection on the performance of interconnected anti-rolling suspension system. The study results indicate that the interconnected anti-rolling suspension system bitterly improves vehicles rolling resistance in contrast to the oil-gas mixed independent suspension, the study results provide theoretical basis for the anti-rolling s design of heavy-duty vehicles.

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Longa, Le Xuan, Le Van Quynh, Nguyen Van Liemb, Bui Van Cuong, and Hoang Anh Tand. "A Comparison of Ride Performance of Hydro-Pneumatic Suspension System with Those of Rubber and Leaf Suspension Systems." IOP Conference Series: Materials Science and Engineering 914 (September 19, 2020): 012037. http://dx.doi.org/10.1088/1757-899x/914/1/012037.

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Martini, A., G. Bellani, and C. Fragassa. "Numerical Assessment of a New Hydro-Pneumatic Suspension System for Motorcycles." International Journal of Automotive and Mechanical Engineering 15, no. 2 (June 30, 2018): 5308–25. http://dx.doi.org/10.15282/ijame.15.2.2018.12.0409.

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Jiao, Na, Jianjuan Guo, and Shulin Liu. "Hydro-Pneumatic Suspension System Hybrid Reliability Modeling Considering the Temperature Influence." IEEE Access 5 (2017): 19144–53. http://dx.doi.org/10.1109/access.2017.2751505.

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Nieto, Antonio J., Angel L. Morales, José M. Chicharro, and Publio Pintado. "An adaptive pneumatic suspension system for improving ride comfort and handling." Journal of Vibration and Control 22, no. 6 (June 30, 2014): 1492–503. http://dx.doi.org/10.1177/1077546314539717.

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Shaik Chand Mabhu Subhani and N.Vijay Kumar. "Static and Model Analysis on Pneumatic Suspension by using Ansys Software." International Journal for Modern Trends in Science and Technology 6, no. 12 (December 18, 2020): 384–89. http://dx.doi.org/10.46501/ijmtst061272.

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During the tractor movement, with being attached to the hitch-system working equipment over Rough road surfaces oscillation of the machine take place. These oscillations are a reason of pressure pulsations in the hydraulic hitch-system. The pressure pulse reduction in the tractor Hitch-system is important for increasing of the system components lifetime. Pressure oscillation damping in the tractor hydraulic hitch-system can reduce overall system oscillations and improve the driving control. The design of spring in suspension system is very important. In this project a shock absorber is designed and a 3D model is created using CATIA V5 R20. The model is also changed by changing the thickness of the spring. Structural analysis and modal analysis are done on the suspension system by varying material for spring, Spring Steel and Beryllium Copper. Analysis done in ANSYS 14.5. The analysis is done by considering loads, bike weight, single person and 2 persons. Structural analysis is done to validate the strength and modal analysis is done to determine the displacements for different frequencies for number of modes. Comparison is done for two materials to verify best material for spring in suspension system.

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Li, I.-Hsum, and Lian-Wang Lee. "Design and Development of an Active Suspension System Using Pneumatic-Muscle Actuator and Intelligent Control." Applied Sciences 9, no. 20 (October 20, 2019): 4453. http://dx.doi.org/10.3390/app9204453.

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A pneumatic muscle is a cheap, clean, and high-power active actuator. However, it is difficult to control due to its inherent nonlinearity and time-varying characteristics. This paper presents a pneumatic muscle active suspension system (PM-ASS) for vehicles and uses an experimental study to analyze its stability and accuracy in terms of reducing vibration. In the PM-ASS, the pneumatic muscle actuator is designed in parallel with two MacPherson struts to provide a vertical force between the chassis and the wheel. This geometric arrangement allows the PM-ASS to produce the maximum force to counter road vibration and make the MacPherson struts generate significant improvement. In terms of the controller design, this paper uses an adaptive Fourier neural network sliding-mode controller with H ∞ tracking performance for the PM-ASS, which confronts nonlinearities and time-varying characteristics. A state-predictor is used to predict the output error and to provide the predictions for the controller. Experiments with a rough concave-convex road and a two-bump excitation road use a quarter-car test rig to verify the practical feasibility of the PM-ASS, and the results show that the PM-ASS gives an improvement the ride comfort.

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Guo, Qinghe, Dingxuan Zhao, Xiaolong Zhao, Zhenxing Li, and Xiaobo Shi. "Active Suspension Control Strategy of Multi-Axle Emergency Rescue Vehicle Based on Inertial Measurement Unit." Sensors 21, no. 20 (October 16, 2021): 6877. http://dx.doi.org/10.3390/s21206877.

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Active suspension control strategies are a top priority in active suspension system. The current research on active suspension control strategies is mostly focused on two-axle vehicles, and there is less research investigating multi-axle vehicles. Additionally, their effective implementation is dependent on accurate mathematical models, and most of them adopt force feedback control, which is vulnerable to external interference. To solve these problems, this paper proposes an active suspension control strategy based on Inertial Measurement Unit. The multi-axle emergency rescue vehicle is made to be equivalent to a 3-degrees-of-freedom parallel mechanism by using the method of grouping and interconnecting the suspension units of the whole vehicle. The attitude change of the vehicle body was transformed into the servo actuator’s displacement by solving the inverse solution of the parallel mechanism position and the action of the servo actuator was driven in reverse according to the displacement obtained. In this way, the vehicle body attitude can be compensated, and the ride comfort and the handling stability of the vehicle can be improved. To verify the effectiveness of the control strategy proposed, the three-axle six vehicle was taken as the research object, the position inverse solution of its equivalent 3-degrees-of-freedom parallel mechanism was deduced, and a high-pass filter was designed. The three-axle vehicle experiment platform integrating active suspension and hydro-pneumatic suspension was built, and the gravel road and slope road experiments were carried out and the results compared with those obtained with hydro-pneumatic suspension. The experiment results showed that, compared with hydro-pneumatic suspension, the active suspension control strategy based on Inertial Measurement Unit proposed in this paper can not only stabilize the body attitude, but also effectively suppress body vibration, improving the ride comfort and handling stability of the vehicle significantly.

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Lü, Bao Zhan, Ai Jun Hu, and Si Hong Zhu. "Experimental Research on the Effect of Sinusoidal Excitation on Dynamic Wheel Load of Hydro-Pneumatic Suspension Vehicle." Applied Mechanics and Materials 143-144 (December 2011): 396–401. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.396.

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Based on the mathematical model of quarter car body model being put forward, the indoor platform experiment of quarter car body with hydro-pneumatic suspension system was done. During test, the parameters of dynamic wheel load along with the change of vibration amplitude and frequency were investigated. The results show that: the cycle of acceleration of sprung mass has half cycle lag than unsprung mass, and the main parameters of dynamic wheel load has increased significantly along with the increase of vibration amplitude and frequency. At the same time, through analysis the acceleration time responses of sprung and unsprung mass, it can be shown that hydro-pneumatic suspension has good anti-vibration performance.

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Awad, Magdy Naeem, Mohamed Ibrahim Sokar, Saber M. Abdrabbo, and Mohamed El-sayed El-Arabi. "Hydro-Pneumatic Energy Harvesting Suspension System Using a PSO Based PID Controller." SAE International Journal of Commercial Vehicles 11, no. 4 (August 1, 2018): 223–34. http://dx.doi.org/10.4271/02-11-04-0018.

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47

Tang, Chen, Avesta Goodarzi, and Amir Khajepour. "A novel integrated suspension tilting system for narrow urban vehicles." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 14 (November 26, 2017): 1970–81. http://dx.doi.org/10.1177/0954407017738274.

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Narrow vehicles are proposed to resolve urban transportation issues such as congestion, parking, fuel consumption and pollution. They are characterized by a high ratio of centre of gravity height over track width. Such vehicles are vulnerable to rollover and stability issues when negotiating curves at a normal operating speed. Therefore, the tilting capability is crucial to such vehicles. Existing solutions, which mechanically connect the wheel module on both sides and synchronize their movement, still have room for further improvement. The extra links for synchronization not only take up space on compact urban vehicles, but also introduce additional mass to the light-weighted body. The novel tilting mechanism introduced in this work utilizes hydraulics to replace mechanical connections to generate the tilting motion. An interconnected hydro-pneumatic suspension system is adopted to provide the desired bump and roll stiffness for narrow urban vehicle applications. Two independently controlled hydraulic pumps are connected to the hydraulic suspensions to provide the tilting, as well as riding height change capabilities. The integration of the tilting system with suspension reduces the system weight and packing size, both of which are vital to the success of narrow urban vehicles. All the functionalities are illustrated, modelled and examined in the simulation studies, which prove the feasibility of the proposed system on narrow urban vehicle applications resulting in more functionalities with lower complexity and weight.

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48

Wahjudi, Sadar. "Desain dan Analisis Perubahan Fluks Magnet Terhadap Efek Peredaman Pada Prototipe Suspensi Pintar." Jurnal Energi dan Teknologi Manufaktur (JETM) 1, no. 01 (June 29, 2018): 25–29. http://dx.doi.org/10.33795/jetm.v1i01.8.

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The vehicle is one of basic needs for supporting mobility of people. Comfort and safety are demanded in every vehicle, especially in its suspension system. The existing suspension systems can’t maximize comfort and safety because it is still hydraulic and pneumatic based, without magnetic system. The purposes of the analysis is building magnetic suspension system with variations at the amount of coil and analyzing absorbing time. The methods of the analysis are determining concept, making the designs, determining components specification, making device block diagram, making wiring diagrams, making the device, taking the absorbing time datas, and the analyzing the data. The results of the analysis are the amount of coil is straight compared to the magnetic force and absorbing time. The most significant solenoid is the one which has 900 coils and has absorbing time at 9.6 seconds.

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Mokni, Lahcen, and Mohamed Belhaq. "Reducing Transmitted Vibration Using Delayed Hysteretic Suspension." Advances in Acoustics and Vibration 2011 (December 13, 2011): 1–5. http://dx.doi.org/10.1155/2011/546280.

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Previous numerical and experimental works show that time delay technique is efficient to reduce transmissibility of vibration in a single pneumatic chamber by controlling the pressure in the chamber. The present work develops an analytical study to demonstrate the effectiveness of such a technique in reducing transmitted vibrations. A quarter-car model is considered and delayed hysteretic suspension is introduced in the system. Analytical predictions based on perturbation analysis show that a delayed hysteretic suspension enhances vibration isolation comparing to the case where the nonlinear damping is delay-independent.

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50

Georgiev, Zlatin, and Lilo Kunchev. "Study of the vibrational behaviour of the components of a car suspension." MATEC Web of Conferences 234 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201823402005.

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The paper presents a study of the vibrational behaviour of a car suspension in the frequency range from 50 to 200 Hz. The vehicle has a torsion spring suspension. The aim of the study is to provide a numerical approach, which evaluates the impact of the tyre vibration characteristics and the elastic properties of suspension elements on the vibrational behaviour of the “tyre-suspension-body” system. The object of the study are the elements of the suspension – stub-axle, upper and lower suspension arms, strut rod, torsion bar and others. The suspension is equipped with pneumatic tyres with different vibration characteristics. Laboratory experiments are done. The tyre contact patch is disturbed by harmonic force. The accelerations of the wheel axle and specific points of the suspension are obtained. A numerical model of the system is created by using the Finite Element Method available in SolidWorks Simulation software. The model allows to determinate the accelerations at different points of the suspension. The results of the experimental and theoretical studies are compared. The values obtained in the two studies are similar.

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Journal articles on the topic 'Pneumatic suspension system'

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