Inspired by the physical phenomenon that the balance position of the vehicle body changes due to a suspension system with asymmetric damping, this paper presents a novel method to control the vehicle height utilizing semi-active actuators. The proposed vehicle height control method uses the asymmetric damping of the semi-active actuator to control the raising and lowering of the vehicle body, which essentially harnesses the energy from the vehicle’s driving vibrations and has the characteristics of low cost, energy saving and fast response. Aiming at the strong nonlinearity and discontinuity of the piecewise linear nonlinear system of the vehicle body vibration, the homotopy analysis method (HAM) is used to solve the high-order analytical solution, the non-smooth terms are processed through Fourier series expansion, and the iteration method is combined to treat the iteration result as the initial guess solution for the next iteration, improving the convergence accuracy of the series solution and expands the application scope of the HAM. The feasibility of the presented method is investigated from an analytical point of view and the influences of some critical parameters on the responses of the system are analyzed. Finally, the magnetorheological damper (MRD) produced by LORD company is utilized as the actuator, and the vehicle height control experiments system is established by using NI-Labview software and NI-PXI hardware platform, The experiments are performed to verify the feasibility of the proposed vehicle height control method and the system response laws. The proposed method realizes the functions of active actuators using semi-active actuators, and tries a new method and approach for vehicle height control under specific working conditions, such as short-term obstacle surmounting, high-speed steering, emergency avoidance, and rollover prevention.

中文翻译：

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一种利用半主动执行器控制车辆高度的新方法


受非对称阻尼悬架系统导致车身平衡位置变化这一物理现象的启发，本文提出了一种利用半主动执行器控制车身高度的新方法。所提出的车高控制方法利用半主动执行器的非对称阻尼来控制车身的升降，本质上是利用车辆行驶振动的能量，具有成本低、节能、响应快的特点。针对车体振动分段线性非线性系统的强非线性和不连续性，采用同伦分析法（HAM）求解高阶解析解，通过傅里叶级数展开对非光滑项进行处理，结合迭代方法，将迭代结果作为下一次迭代的初始猜测解，提高了级数解的收敛精度，扩大了HAM的应用范围。从分析的角度研究了该方法的可行性，并分析了一些关键参数对系统响应的影响。最后，以LORD公司生产的磁流变阻尼器（MRD）为执行机构，利用NI-Labview软件和NI-PXI硬件平台搭建了车辆高度控制实验系统，进行实验验证了该方案的可行性。提出了车辆高度控制方法和系统响应规律。 该方法利用半主动执行器实现了主动执行器的功能，为短期越障、高速转向、紧急避让、防侧翻等特定工况下的车辆高度控制尝试了新的方法和途径。 。