Subcritical flutter in the acoustics of friction

Subcritical flutter in the acoustics of friction
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摩擦声学中的亚临界颤振

DOI:
10.1098/rspa.2008.0021
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发表时间:
2008
期刊:
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子:
--
通讯作者:
Kirillov O.N.
Kirillov O.N.
中科院分区:
--
文献类型:
--
作者:
Kirillov O.N.

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旋转弹性体的线性化模型,绕其对称轴旋转,具有相对于旋转速度的本征频率图,其在节点处形成具有双半简本征频率的网格。在与摩擦片接触时,旋转连续体,如唱歌的酒杯或尖叫的盘式制动器,由于亚临界颤振不稳定性而开始振动。在本文中,灵敏度分析的频谱网格显式预测的开始不稳定。阐明了不确定阻尼和非保守位置力在亚临界颤振发展和局部化中的关键作用。非自伴边界特征值问题的旋转圆弦,固定负载系统的约束下,分析表明,不稳定的情况下,揭示在一般的二维情况下,也是典型的在更复杂的有限维和分布式系统。
Linearized models of elastic bodies of revolution, spinning about their symmetrical axes, possess the eigenfrequency plots with respect to the rotational speed, which form a mesh with double semi-simple eigenfrequencies at the nodes. At contact with friction pads, the rotating continua, such as the singing wine glass or the squealing disc brake, start to vibrate owing to the subcritical flutter instability. In this paper, a sensitivity analysis of the spectral mesh is developed for the explicit predicting the onset of instability. The key role of the indefinite damping and non-conservative positional forces is clarified in the development and localization of the subcritical flutter. An analysis of a non-self-adjoint boundary-eigenvalue problem for a rotating circular string, constrained by a stationary load system, shows that the instability scenarios, revealed in the general two-dimensional case, are typical also in more complicated finite-dimensional and distributed systems.
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