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工程力学  2014 

多界面干摩擦系统的减振特性及设计方法研究

DOI: 10.6052/j.issn.1000-4750.2012.10.0755, PP. 237-246

Keywords: 振动抑制,库仑干摩擦,时/频转换法,谐波平衡法,阻滞-滑移运动,非线性振动

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Abstract:

作为一类非线性阻尼,干摩擦阻尼器的减振效果通常与激振力水平直接相关,且往往只在一个激振力水平下具有最佳振动抑制效果。为改善其“激振力-减振效果”特性,提出了设计多界面干摩擦系统的思路。从一类可描述扭转振动的集总参数模型出发,探讨了此类系统的可行性,并给出了无量纲的动力学方程组。其次,提出了一种改进的时/频转换方法,用以分析包含任意干摩擦界面系统的频域响应,考虑了每个干摩擦界面上可能出现的周期内“滑移”、“滑移-阻滞”和“阻滞”运动状态。同时,用相应的数值积分方法验证了该方法的正确性和在计算速度上的优势。在此基础上,分析了干摩擦界面的个数、临界摩擦力和质量对系统特性的影响,以二界面和三界面干摩擦系统为算例,阐明了采用多个干摩擦界面改善系统减振性能的机理和设计方法。

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