The vibration damping effectiveness of an active seat suspension system and its robustness to varying mass loading

This paper is contrary to the seat multi-dimensional problem basing on task space. Using double triangle steward parallel mechanism as the main structure of the seat suspension, according to the sensitive frequency range and the natural frequency of vehicle body, we optimize the design of the suspension system. Research shows that the optimized design of the double triangle Stewart parallel suspension seat suspension system to ensure vertical, pitch, roll three of the more important natural frequency both directions away from the vehicle's natural frequency, but also avoid the human body sensitive frequency range.

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Robust Control of Automotive Active Seat-Suspension System Subject to Actuator Saturation

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4026833 ◽

2014 ◽

Vol 136 (4) ◽

Cited By ~ 16

Author(s):

Zhou Gu ◽

Shumin Fei ◽

Yaqin Zhao ◽

Engang Tian

Keyword(s):

Controller Design ◽

Actuator Saturation ◽

Input Saturation ◽

Output Feedback Control ◽

Suspension System ◽

Linear Matrix ◽

Control Input ◽

State Variables ◽

Sampled Data ◽

Seat Suspension

This paper deals with the problem of robust sampled-data control for an automotive seat-suspension system subject to control input saturation. By using the nature of the sector nonlinearity, a sampled-data based control input saturation in the control design is studied. A passenger dynamic behavior is considered in the modeling of seat-suspension system, which makes the model more precisely and brings about uncertainties as well in the developed model. Robust output feedback control strategy is adopted since some state variables, such as, body acceleration and body deflection, are unavailable. The desired controller can be achieved by solving the corresponding linear matrix inequalities (LMIs). Finally, a design example has been given to demonstrate the effectiveness and advantages of the proposed controller design approach.

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Effect of delayed resonator on the vibration reduction performance of vehicle active seat suspension

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/14613484211046458 ◽

2021 ◽

pp. 146134842110464

Author(s):

Yongguo Zhang ◽

Chuanbo Ren ◽

Kehui Ma ◽

Zhen Xu ◽

Pengcheng Zhou ◽

...

Keyword(s):

Time Delay ◽

Vibration Reduction ◽

Suspension System ◽

Vibration Response ◽

Vibration Absorber ◽

Dynamic Vibration Absorber ◽

Precise Integration ◽

Seat Suspension ◽

Dynamic Vibration ◽

Seat Vibration

The combination of dynamic vibration absorber and partial state feedback with time-delay is called delayed resonator. In order to suppress the seat vibration caused by uneven road surface and improve ride comfort, the delayed resonator is applied to the seat suspension to realize active control of the seat suspension system. The dynamic model of the half-vehicle suspension system is established, and the time-delay differential equation of the system under external excitation is solved by the precise integration method. The root mean square of the time-domain vibration response of seat displacement, seat acceleration and vehicle acceleration are selected as the objective function. Then, the optimal time-delay control parameters are obtained by particle swarm optimization algorithm. The frequency sweeping method is used to obtain the critical time-delay value and time-delay stable interval of the system. Finally, an active seat suspension model with delayed resonator is established for numerical simulation. The results show that the delayed resonator can greatly suppress the seat vibration response regardless of the road simple harmonic excitation or random excitation. Compared with dynamic vibration absorber, it has a better vibration absorption effect and a wider vibration reduction frequency band.

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Influence of the Dry Friction Suspension System Characteristics on the Stick-Slip of Vertical Vibration of a Three-Piece Bogie

Shock and Vibration ◽

10.1155/2021/8868996 ◽

2021 ◽

Vol 2021 ◽

pp. 1-15

Author(s):

Dali Lyu ◽

Qichang Zhang ◽

Kewei Lyu ◽

Jiaxing Liu ◽

Yulong Li

Keyword(s):

Numerical Method ◽

Dry Friction ◽

Wedge Angle ◽

Vertical Vibration ◽

Vibration Damping ◽

Suspension System ◽

Railway Vehicle ◽

Stick Slip ◽

System Frequency ◽

Dry Friction Damping

The dry friction structure is a commonly used vibration-damping method for railway vehicles. Insufficient vibration damping performance will cause excessive vibration of the vehicle, which is not conducive to the safety of the vehicle. However, the mechanism of vibration damping and the cause of clamping stagnation have not been well resolved. This paper uses the analytical method, numerical method, and finite element method to analyze the vertical dynamic characteristics of the simple suspension system with dry friction and demonstrates that the numerical method is an effective method to study the dry model. The conditions for the system to produce sticking events were analyzed by the numerical method. The analysis shows that the system's excitation is too small, which causes clamping stagnation to the system. The reduction of the wedge angle and the friction coefficient are conducive to eliminating sticking. A negative side frame angle is conducive to reducing the high-frequency energy of the excitation. Decreasing spring stiffness or increasing system mass to reduce system frequency can reduce sticking events. The mutual verification of different methods confirms the correctness of the analysis method and analyzes the cause of sticking or clamping stagnation from the mechanism, which provides a new idea for the design and improvement of the dry friction damping system of railway vehicle bogies.

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Vibration damping device for use in automotive suspension system and suspension system using the same

The Journal of the Acoustical Society of America ◽

10.1121/1.2771317 ◽

2007 ◽

Vol 122 (2) ◽

pp. 700

Author(s):

Akira Katagiri

Keyword(s):

Vibration Damping ◽

Suspension System ◽

Automotive Suspension

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An Active Seat Suspension System for Off-Road Vehicles

Transactions of the ASAE ◽

10.13031/2013.38545 ◽

1970 ◽

Vol 13 (1) ◽

pp. 0099-0106 ◽

Cited By ~ 10

Author(s):

L. F. Stikeleather and C. W. Suggs

Keyword(s):

Suspension System ◽

Road Vehicles ◽

Seat Suspension

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Evaluation of vehicles’ active seat suspension system using wavelet analysis

Noise & Vibration Worldwide ◽

10.1177/0957456520924813 ◽

2020 ◽

Vol 51 (10) ◽

pp. 176-185

Author(s):

Andrzej Błażejewski ◽

Sebastian Głowiński

Keyword(s):

Transfer Function ◽

Wavelet Analysis ◽

Human Body ◽

Human Head ◽

Suspension System ◽

Test Stand ◽

Seat Suspension ◽

System Output ◽

Vehicle Seat

In this work, the dedicated test stand was applied to investigate the human body–vehicle seat system. The particular signals were measured by accelerometers placed on the seat and the human head. The horizontal vibrations were applied as the input to the system. As an alternative to the classical Fourier approach, the wavelet transfer function was introduced to describe the effectiveness of particular seat suspension. The human head reaction was investigated as the system output.

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