The Experts below are selected from a list of 11841 Experts worldwide ranked by ideXlab platform
Tianhong Yan - One of the best experts on this subject based on the ideXlab platform.
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a compact variable stiffness and damping Shock Absorber for vehicle suspension
IEEE-ASME Transactions on Mechatronics, 2015Co-Authors: Shuaishuai Sun, Huaxia Deng, Jian Yang, Guiping Liu, Gursel Alici, Tianhong YanAbstract:A Shock Absorber is an important device for vehicle suspension. The semi-active suspension requires the damping or stiffness of the Shock Absorber to be controllable. This paper proposed a novel compact Shock Absorber with both damping and stiffness variable characteristics. The Shock Absorber is developed based on MR fluid through an innovative design. A prototype is tested by MTS to characterize the variable damping and stiffness properties. A mathematical model that incorporated the Bingham model is established and an optimization method is adopted to identify the parameters. The coherence of experiments and the proposed model verified the control ability of dual damping and stiffness of the Shock Absorber.
Urszula Ferdek - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube Shock Absorber
Nonlinear Dynamics, 2020Co-Authors: Jan Łuczko, Urszula FerdekAbstract:The paper presents a new concept of absorbing car body vibrations, which consists in a modification of the construction of the classical mono-tube hydraulic Shock Absorber by the introduction of an additional inner cylinder with an auxiliary piston. By making an appropriate selection of the system parameters, one may obtain the damping force characteristics dependent on the excitation amplitude and frequency. In the case of driving on a good-quality road surface, the Shock Absorber displays the soft characteristics which are desired as far as the driving comfort is concerned. In the case of worse-quality roads or while overcoming large obstacles, the hard characteristics ensure a higher level of safety and protect the Shock Absorber from getting damaged. The developed nonlinear model makes it possible to effectively analyse the system responses to harmonic, impulse and random excitations. On the basis of the analysis of the impact of harmonic excitations on the driving comfort and safety indexes, one may estimate the optimal values of the Shock Absorber construction parameters. Impulse and random excitations are applied in order to finally verify the effectiveness of the operation of the proposed Shock Absorber.
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Nonlinear modeling and analysis of a Shock Absorber with a bypass
Journal of Theoretical and Applied Mechanics, 2018Co-Authors: Urszula Ferdek, Jan ŁuczkoAbstract:The model of a mono-tube Shock Absorber with a bypass is proposed in this paper. It is shown that the application of an additional flow passage (bypass) causes changes to the damping force characteristics when the excitation amplitudes are large. In such cases, the damping force values increase, thereby improving safety of the ride. For small excitation amplitudes, the Shock Absorber behaves in a similar fashion as Shock Absorbers without a bypass, ensuring a high comfort level of the ride on roads with smooth surfaces.
Shuaishuai Sun - One of the best experts on this subject based on the ideXlab platform.
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a compact variable stiffness and damping Shock Absorber for vehicle suspension
IEEE-ASME Transactions on Mechatronics, 2015Co-Authors: Shuaishuai Sun, Huaxia Deng, Jian Yang, Guiping Liu, Gursel Alici, Tianhong YanAbstract:A Shock Absorber is an important device for vehicle suspension. The semi-active suspension requires the damping or stiffness of the Shock Absorber to be controllable. This paper proposed a novel compact Shock Absorber with both damping and stiffness variable characteristics. The Shock Absorber is developed based on MR fluid through an innovative design. A prototype is tested by MTS to characterize the variable damping and stiffness properties. A mathematical model that incorporated the Bingham model is established and an optimization method is adopted to identify the parameters. The coherence of experiments and the proposed model verified the control ability of dual damping and stiffness of the Shock Absorber.
Jan Łuczko - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube Shock Absorber
Nonlinear Dynamics, 2020Co-Authors: Jan Łuczko, Urszula FerdekAbstract:The paper presents a new concept of absorbing car body vibrations, which consists in a modification of the construction of the classical mono-tube hydraulic Shock Absorber by the introduction of an additional inner cylinder with an auxiliary piston. By making an appropriate selection of the system parameters, one may obtain the damping force characteristics dependent on the excitation amplitude and frequency. In the case of driving on a good-quality road surface, the Shock Absorber displays the soft characteristics which are desired as far as the driving comfort is concerned. In the case of worse-quality roads or while overcoming large obstacles, the hard characteristics ensure a higher level of safety and protect the Shock Absorber from getting damaged. The developed nonlinear model makes it possible to effectively analyse the system responses to harmonic, impulse and random excitations. On the basis of the analysis of the impact of harmonic excitations on the driving comfort and safety indexes, one may estimate the optimal values of the Shock Absorber construction parameters. Impulse and random excitations are applied in order to finally verify the effectiveness of the operation of the proposed Shock Absorber.
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Nonlinear modeling and analysis of a Shock Absorber with a bypass
Journal of Theoretical and Applied Mechanics, 2018Co-Authors: Urszula Ferdek, Jan ŁuczkoAbstract:The model of a mono-tube Shock Absorber with a bypass is proposed in this paper. It is shown that the application of an additional flow passage (bypass) causes changes to the damping force characteristics when the excitation amplitudes are large. In such cases, the damping force values increase, thereby improving safety of the ride. For small excitation amplitudes, the Shock Absorber behaves in a similar fashion as Shock Absorbers without a bypass, ensuring a high comfort level of the ride on roads with smooth surfaces.
M Moallem - One of the best experts on this subject based on the ideXlab platform.
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regenerative Shock Absorber using a two leg motion conversion mechanism
IEEE-ASME Transactions on Mechatronics, 2015Co-Authors: Amir Maravandi, M MoallemAbstract:This paper presents the development of a novel regenerative Shock Absorber sized for a passenger car suspension system. The Shock Absorber includes a simple and highly efficient motion converter called a two-leg mechanism , a planetary gearhead, and a brushless three-phase rotary machine. The design and analysis of the regenerative Shock Absorber are presented by considering the dynamics and efficiency of the electromechanical device. The performance of the regenerative damper is evaluated under sinusoidal excitation inputs for typical amplitudes and frequencies in a vehicular suspension system. Experimental results show that a damping coefficient of $1720$ N $\cdot$ s/m can be achieved by controlling the external loads. Furthermore, a mechanical energy conversion efficiency between 0.71 and 0.84 is achieved, which is considerably higher than other mechanisms reported in the literature, such as ball screw, rack-and-pinion, and linear mechanisms.
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electromagnetic Shock Absorber
International Electric Machines and Drives Conference, 2001Co-Authors: Saeid Mirzaei, S M Saghaiannejad, V Tahani, M MoallemAbstract:This paper introduces a novel passive suspension system for ground vehicles. The system is based a flexible electromagnetic Shock Absorber (EMSA). In the proposed system, it is attempted: (a) to select a variable high damping coefficient usable in a car; (b) physical dimensions and the geometry of EMSA not to be very different from mechanical Shock Absorbers; and (c) its weight and volume to be low for the core not to be saturated. After designing and providing a model, the results of the test model are compared with the behavior of a tubular linear induction motor, which is connected to DC supply. This system will have low cost and will be controllable.
