车辆座椅半主动减振系统非线性特性分析
2016-03-23夏兆旺魏守贝张帆袁秋玲王雪涛方
夏兆旺 魏守贝 张帆 袁秋玲 王雪涛 方媛媛



摘 要:针对磁流变阻尼器提出了一个简单的修正Bingham模型。基于修正Bingham模型建立了汽车座椅减振系统的非线性模型,通过平均法得到了半主动减振系统发生主共振时的理论解,并进行了数值验证。结果表明,采用平均法得到的理论解和数值解有很好的一致性。数值仿真表明在主共振区,磁流变阻尼器的阻尼和控制力对半主动减振系统的幅频响应影响都很明显,半主动减振系统的幅频响应随阻尼和控制力的增加都显著减小。在非共振区,磁流变阻尼器的阻尼、控制力和零力速度对座椅系统的响应影响都很小。
关键词:车辆座椅;半主动;非线性;振动
中图分类号:U463.83+6文献标文献标识码:A文献标DOI:10.3969/j.issn.2095-1469.2015.06.06
Abstract:The paper proposes a correction Bingham model for describing MR damper with experimental data. The primary resonance reduction in the semi-active vibration isolation system for vehicle seats was investigated. An analytical solution for the primary resonance was obtained, which was verified by numerical solution with Simulink. The effect of model parameters on the system's primary resonance was studied. The research results show that the damping of MRD and the control force have a significant effect on amplitude-frequency response in the resonance region. The amplitude-frequency response of the semi-active vibration isolation system decreases with the increase of the damping of MRD and control force. However, in the non-resonant region, the damping, control force and speed have a small impact on amplitude-frequency response.
Key words:vehicle seat; semi-active; nonlinear; vibration
汽车的舒适性一直是衡量车辆性能的重要指标,车辆的噪声、振动与声振粗糙度(Noise Vibra-tion and Harshness,NVH)问题又是衡量其舒适性的重要指标之一。车辆产生的振动将直接通过座椅传递给人体,如何提高座椅的减振性能至关重要。座椅最常用的座椅悬架通常是线性悬架减振系统,成本较低,但其减振效果有限[1-3]。为进一步提高座椅悬架系统的减振效果,本文将探讨基于磁流变阻尼技术的座椅半主动非线性减振系统。
磁流变阻尼器具有响应快、能耗低等优点[4-5],已被广泛应用于桥梁、土木和机械等领域的减振降噪[6-7]。在汽车领域磁流变阻尼已被应用于悬架系统[8]。
本文将建立基于磁流变阻尼技术的车辆座椅半主动非线性减振系统模型,研究其主共振特性,采用平均法分析半主动非线性减振系统的稳态响应,研究半主动非线性减振系统参数对减振效果的影响规律,并对理论解进行数值验证。……
