Stability of weakly damped MDGKN‐systems: The role of velocity proportional terms

Stability of weakly damped MDGKN‐systems: The role of velocity proportional terms
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弱阻尼 MDGKN 系统的稳定性:速度比例项的作用

DOI:
10.1002/zamm.201600288
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发表时间:
2017
期刊:
ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik
影响因子:
--
通讯作者:
Hagedorn
Hagedorn
中科院分区:
--
文献类型:
--
作者:
Hagedorn

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机械工程中的许多问题,在线性化的情况下,可以建模为二阶微分方程系统,其中矩阵对应于惯性,阻尼,陀螺,刚度和循环力。后者可能导致自激振动,这通常是不需要的,有时是危险的。众所周知,循环系统()对阻尼非常敏感,其稳定性行为可能强烈依赖于阻尼矩阵的结构[4,5,7]。此外,很长一段时间以来人们都知道,增加(即使是无穷小的)阻尼也可能使这样的系统不稳定[1,17]。本文较详细地研究了速度比例项对这类力学系统稳定性的影响。其目的是扩展最近由Hagedornet等人在[4]中提出的发现。因此,对于无穷小、不完全和不定阻尼矩阵,以及陀螺项和本征频率间距的作用,分析了解析推导的两自由度系统的稳定性边界。
Many problems in mechanical engineering, in the linearized case, can be modeled as a second order system of differential equations of type , where the matrices correspond to inertia, damping, gyroscopic, stiffness, and circulatory forces. The latter may lead to self‐excited vibrations which in general are unwanted and sometimes dangerous. It is well known that circulatory systems () are very sensitive to damping and their stability behavior may strongly depend on the structure of the damping matrix [4,5,7]. Moreover, it has been known for a long time, that the addition of (even infinitesimally small) damping may also destabilize such systems [1,17]. The present note studies in more detail some of the effects of velocity proportional terms on the stability of mechanical systems of this type. The aim is to extend the findings recently presented byHagedornet al. in [4]. Therefore, the analytically derived stability boundary of an ‐system with two degrees of freedom is analyzed with regard to infinitesimally small, incomplete, and indefinite damping matrices as well as the role of gyroscopic terms and the spacing of the eigenfrequencies.
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