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- 2016
闭环耦合模型中制动盘重根模态
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Abstract:
盘式制动器噪声闭环耦合模型中, 制动盘模态参数由有限元计算得出, 存在大量重根模态, 它们在物理本质上是一阶模态, 而子结构模态构成分析方法将重根模态视为独立模态进行计算, 导致其结果难以理解。该研究详细解释了重根模态现象, 通过对制动盘重根模态振型进行拟合处理, 根据模态构成系数的含义和拟合得到的振型表达式推导了表征重根模态整体对不稳定模态贡献的综合构成系数。算例结果表明: 应用该方法可清晰分析对比制动盘重根模态对制动噪声的影响, 从而为制定有效抑制噪声的措施提供依据。
Abstract：To develop closed-loop coupling models for brake squeal analyses, the modal parameters of the disc rotor are calculated from the finite element model and many repeated-root modes appear. A pair of repeated-root modes represents one vibration mode. However, the current substructure mode composition analysis method treats each pair of repeated-root modes as two independent modes, so there may be difficulty in identifying the most important parameters for the noise mode. The modal shape coefficients of the repeated-root modes are fit from the finite element results. A single composition factor is then derived for each pair of repeated-root modes which represents the total contribution of these modes to the noise mode according to the definition of the mode composition and the curve fits. Examples show that this method more clearly relates repeated-root modes of the disc rotor to the noise mode, which provides support for developing effective measures for squeal reduction.
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