动力吸振器中库仑阻尼对吸振性能的影响
Influence of Coulomb damping on vibration absorber
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摘要: 研究了动力吸振器中库仑阻尼（干摩擦）对吸振性能的影响。给出了库仑摩擦模型，在考虑了吸振器中的库仑阻尼的情况下，分析了库仑阻尼引起的主振动系统与附加质量块的2种相对运动状态（滑移和粘滞）以及它们存在和转换的条件，讨论了因库仑阻尼引起的吸振器自由度冻结现象;用Simulink仿真工具对非线性吸振器进行了数值仿真，研究了谐波和白噪声激励下库仑阻尼对吸振器吸振性能的影响以及库仑阻尼与线性阻尼的等效问题。结果显示：弱激励条件下，非线性吸振器减弱吸振效果,强激励条件下增强吸振效果。Abstract: The influence of Coulomb damping on vibration absorber. The model of Coulomb damping was introduced concerning Coulomb damping in the vibration absorber, two relative motions between the master vibration system and the addition mass, sticking and sliding, were analyzed, and the conditions in which two motions and alternate were discussed, as well as the freezing of the degree of freedom due to coulomb damping. Numerical simulation was conducted using Simulink of MATLAB to study the vibration absorbing excited by harmonic and white noise and the equivalence between coulomb damping and linear damping.
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