基于模态试验和有限元模态分析的转向盘怠速抖动改进

摘要

To troubleshoot the cause of idle vibration of the steering wheel of a vehicle in idling, we make vehicle idling vibration test and steering wheel modal test, to determine that the resonance is caused by insufficient connection stiffness between instrument panel beam system and the steering wheel and the body that results in the decline of the entire steering system modal. To eliminate this problem, a finite element model of the steering system is created and validated according to the modal test results. The connection stiffness is optimized on the basis of the finite element model. The optimization proposal is tested, which demonstrates the effectiveness of this proposal.%针对某车型怠速工况下转向盘抖动问题，对整车进行了怠速振动试验并对转向盘进行了模态试验，确认转向盘系统与仪表板横梁及横梁与车身连接处的连接刚度不足导致整个转向系统模态下降，从而引起了共振。针对该问题建立了转向系统有限元模型，并根据模态试验结果对模型进行了验证。在该模型基础上对上述连接刚度进行了优化，对优化方案进行试验验证的结果表明该方案有效。