Study on Bifurcation, Chaos and Chaotic Control of Vehicle Suspension with Nonlinearities under Road Excitation

2009 ◽  
Author(s):  
Y. Sheng ◽  
G.-Q. Wu ◽  
X.-J. Meng
Keyword(s):  
Vehicle Suspension ◽  
Chaotic Control ◽  
Road Excitation ◽  
Bifurcation Chaos

A Pneumatic Artificial Muscle Bionic Kangaroo Leg Suspension

2019 ◽  
Vol 12 (4) ◽  
pp. 357-366
Author(s):  
Yong Song ◽  
Shichuang Liu ◽  
Jiangxuan Che ◽  
Jinyi Lian ◽  
Zhanlong Li ◽  
...  
Keyword(s):  
Strong Shock ◽  
Artificial Muscle ◽  
Suspension System ◽  
Vehicle Body ◽  
Vehicle Suspension ◽  
Pneumatic Artificial Muscle ◽  
Advantages And Disadvantages ◽  
Road Excitation ◽  
Vehicle Suspension System ◽  
Suspension Structure

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.

scholarly journals Control parameter optimization of a nonlinear vehicle suspension system with time-delayed acceleration feedback

2020 ◽  
pp. 146134842097920
Author(s):  
Yixia Sun
Keyword(s):  
Feedback Control ◽  
Delayed Feedback Control ◽  
Vehicle Suspension ◽  
Optimal Time ◽  
Control Force ◽  
Acceleration Amplitude ◽  
Acceleration Feedback ◽  
Road Excitation ◽  
Vehicle Suspension System ◽  
Time Delayed Feedback

A time-delayed acceleration feedback control is proposed to improve the vibration performance of a nonlinear vehicle suspension system. First, the harmonic balance method is applied to obtain the vertical acceleration amplitude of the system excited by simple harmonic road excitation. Then, taking the amplitude of the sprung mass acceleration and control force into account, the single-objective and multiple-objective optimization problems of time-delayed feedback control parameters, respectively, are discussed. Finally, the mathematical simulation is provided to verify the correctness of the optimization results. It is concluded that the nonlinear suspension with optimal time-delayed feedback control has better vibration control performance compared to passive one. The acceleration amplitude of the sprung mass is significantly reduced by the single-objective optimization of the control parameters. Moreover, when the optimal time delay is introduced, the active control force input is fewer than that without time delay. The phenomenon of energy transfer between the sprung mass and the unsprung mass is observed in some road-excitation frequencies.

A robust hybrid generator for harvesting vehicle suspension vibration energy from random road excitation

2022 ◽  
Vol 309 ◽  
pp. 118506
Author(s):  
Yanqiang Hu ◽  
Xiaoli Wang ◽  
Yechen Qin ◽  
Zhihao Li ◽  
Chenfei Wang ◽  
...  
Keyword(s):  
Vibration Energy ◽  
Vehicle Suspension ◽  
Road Excitation ◽  
Hybrid Generator

scholarly journals Study of the Fatigue Life and Weight Optimization of an Automobile Aluminium Alloy Part under Random Road Excitation

2010 ◽  
Vol 17 (2) ◽  
pp. 107-121 ◽  
Author(s):  
A. Saoudi ◽  
M. Bouazara ◽  
D. Marceau
Keyword(s):  
Fatigue Life ◽  
Aluminium Alloy ◽  
Natural Frequencies ◽  
Vehicle Suspension ◽  
Critical Element ◽  
Alloy Sample ◽  
Weight Optimization ◽  
Frequency Range ◽  
Power Spectral ◽  
Road Excitation

Weight optimization of aluminium alloy automobile parts reduces their weight while maintaining their natural frequency away from the frequency range of the power spectral density (PSD) that describes the roadway profile. We present our algorithm developed to optimize the weight of an aluminium alloy sample relative to its fatigue life. This new method reduces calculation time; It takes into account the multipoint excitation signal shifted in time, giving a tangle of the constraint signals of the material mesh elements; It also reduces programming costs. We model an aluminium alloy lower vehicle suspension arm under real conditions. The natural frequencies of the part are inversely proportional to the mass and proportional to flexural stiffness, and assumed to be invariable during the process of optimization. The objective function developed in this study is linked directly to the notion of fatigue. The method identifies elements that have less than 10% of the fatigue life of the part's critical element. We achieved a weight loss of 5 to 11% by removing the identified elements following the first iteration.

scholarly journals Multi-Objective Optimization of Vehicle Suspension Parameters Considering Various Road Classes

2014 ◽  
Vol 22 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Ferdinand Havelka ◽  
Miloš Musil
Keyword(s):  
Random Search ◽  
Vehicle Suspension ◽  
Multi Objective Optimization ◽  
Design Constraints ◽  
Shaping Filter ◽  
First Order ◽  
Car Model ◽  
Suspension Parameters ◽  
Excitation Time ◽  
Road Excitation

Abstract Vehicle suspension optimization for various road classes travelled at different velocities is performed. Road excitation is modeled using a first order shaping filter. A half-car model is adopted to simulate the vehicle’s vertical dynamics. The excitation time delay between the rear and the front tire is modeled using Pade approximation. Suspension parameters are optimized using a random search method with respect to “comfort” and “sporty driving” considering the design constraints of the suspension and road holding and maximum suspension travel constraints. Optimal suspension parameters suitable for various road classes and vehicle velocities have been chosen.

Simulation Model of the Dynamic Behavior of a Tire Running Over an Obstacle

1988 ◽  
Vol 16 (2) ◽  
pp. 62-77 ◽  
Author(s):  
P. Bandel ◽  
C. Monguzzi
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Black Box ◽  
Box Model ◽  
Vehicle Suspension ◽  
Empirical Relationships ◽  
Static Tests ◽  
High Speeds ◽  
Dynamic Forces ◽  
Vehicle Suspension System

Abstract A “black box” model is described for simulating the dynamic forces transmitted to the vehicle hub by a tire running over an obstacle at high speeds. The tire is reduced to a damped one-degree-of-freedom oscillating system. The five parameters required can be obtained from a test at a given speed. The model input is composed of a series of empirical relationships between the obstacle dimensions and the displacement of the oscillating system. These relationships can be derived from a small number of static tests or by means of static models of the tire itself. The model can constitute the first part of a broader model for description of the tire and vehicle suspension system, as well as indicating the influence of tire parameters on dynamic behavior at low and medium frequencies (0–150 Hz).

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