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Dual-chamber pneumatically interconnected suspension: Modeling and theoretical analysis

机译：双室气动相互连接：建模与理论分析

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Increasing concerns on the compromise between the vehicle ride comfort and roll stability call for the continuous developments of the vehicle suspension systems. This paper devotes a theoretical study in developing a dual-chamber pneumatically interconnected suspension (DCPIS) system to enhance the vehicle ride comfort while maintaining good anti-roll performance. A quarter car with the dual-chamber air suspension is modeled to study the vibration characteristics in terms of the vertical stiffness and the natural frequency of the suspension. Further, a novel DCPIS system of a vehicle is proposed. By assuming the displacement excitations are small from the equilibrium position, the vibration equations of the mechanical-pneumatic coupled system for a roll-plane 4-degree-of-freedom (4-DOF) half-car model with DCPIS are derived in frequency domain, which include the dynamic equations of the mechanical system, the linear differential equations of the dual-chamber air springs, and the pipes. Based on the system dynamic equations, both the vehicle free vibration modes and frequency response functions (FRFs) are compared between the half-car with the DCPIS and that with the standalone dual-chamber air suspension. The results show that the DCPIS can alleviate the vertical and roll vibration because it decreases the suspension stiffness and meanwhile increases the system damping ratio. The effects of the DCPIS system parameters on the vehicle bounce and roll vibration trans-missibility properties are further investigated. In addition, the bounce and roll stiffness characteristics of the DCPIS are studied. It shows that its nonlinear bounce and roll stiffness behaviors have the advantages not only to alleviate shocks under extreme impact from the road obstacle and but also prevent rollovers in sharp steering maneuvers.
机译：越来越多地对车辆乘坐舒适性和滚动稳定性呼叫的折衷来呼吁车辆悬架系统的连续发展。本文致力于开发双室气动互连悬架（DCPI）系统，以增强车辆乘坐舒适性，同时保持良好的抗卷性能。具有双腔空气悬架的四分之一轿厢模型，以研究悬浮刚度和固有频率方面的振动特性。此外，提出了一种车辆的新型DCPIS系统。通过假设从平衡位置较小的位移激励，辊平面4-自由度（4-DOF）半汽车模型的机械气动耦合系统的振动方程衍生在频域中包括机械系统的动态方程，双室空气弹簧和管道的线性微分方程。基于系统动态方程，将车辆自由振动模式和频率响应函数（FRFS）与DCPI的半轿厢与独立双室空气悬架进行比较。结果表明，DCPI可以缓解垂直和卷振动，因为它会降低悬浮刚度，同时增加系统阻尼比。进一步研究了DCPIS系统参数对车辆反弹和辊振反应性性质的影响。此外，研究了DCPI的反弹和辊刚度特性。它表明，其非线性反弹和滚动刚度行为具有不仅可以缓解在道路障碍物的极端冲击下的冲击，而且还可以防止滚动转向操纵滚动。

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