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Identification on modal coupling of a self-excited vibration of an automobile wiper

汽车雨刮器自激振动模态耦合辨识

基本信息

批准号：
08650282
负责人：
NAGAI Ken-ichi
金额：
$ 0.9万
依托单位：
GUNMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

An automotive wiper swept of glass surface causes a self-excited vibration in several conditions. Research work is presented for a generation of the self-excited vibration of the wiper. Experimental stdies are conducted both of an actual wiper and a simplified wiper model. Toreveal the number of modes in the wipe vibration, evaluation by the maximum Lyapunov exponent is applid. Both in the experiment and the numerical simulation of wiper oscillation, it is found as followings ;1.The actual wiper oscillates with two degrees of freedom. Modes of vibration are classified with translating movement pivoted on the base and the pitching movement centered at the blade.2.The wiper vibration is excited by the self-excited vibration with a type of stick-slip motion.3.Both wiper movements along to the glass surface and perpendicular to the surface has a significant effect on the large amplitude vibration of the wiper. Aresponse by parametric excitation is also induced same in the large amplitude vibration.In the experiment of the wiper vibration taking the effect of blade deforrmation, following results are obtained.1.The wiper blade has characteristics of nonlinear restoring force included a post-buckled configuration.2.When the blade presses the glass in the nearly buckling load, the best sweeping condition is obtained.3.If the sweeping speed is slow in the practical wiper, intricated responses are generated by the many modes of the wiper vibration. When the sweeping speed increases, the response is shifted to a simplified vibration with two degrees of freedom.

汽车刮水器扫过玻璃表面在几种情况下会引起自激振动。研究了刮水器自激振动的产生机理。对实际刮水器和简化刮水器模型进行了试验研究。通过计算刮擦振动的模态数，采用最大李雅普诺夫指数进行评价。在刮水器振动的实验和数值模拟中发现：1.实际刮水器是两个自由度的振动。刮水器的振动模式分为以底座为支点的平移运动和以刮水器叶片为中心的俯仰运动; 2.刮水器的振动是由具有粘滑运动的自激振动激发的; 3.刮水器沿着玻璃表面和垂直于玻璃表面的运动对刮水器的大幅振动都有显著影响。在考虑刮水器叶片变形影响的刮水器振动实验中，得到了如下结果：1.刮水器叶片具有非线性恢复力特性，包括后屈曲构型; 2.当刮水器叶片在近屈曲载荷作用下与玻璃接触时，3.在实际刮水器中，当刮水速度较低时，刮水器的多个振动模态会产生复杂的响应。当扫频速度增加时，响应转变为具有两个自由度的简化振动。