摘要
本文采用矩阵谱分解中常用的Sylvester理论和Fourier级数展开法，推导了单自由度参数振动系统的频响函数，并得到了系统外激励共振条件。在此基础上，以直齿轮副参数振动系统为例仿真了系统的频响特性，并讨论了系统参数稳定性、时变参数以及阻尼的影响。结果表明，参数振动系统的频响特性主要有以下一些特点：1 系统具有多个频响函数，分别对应于多频响应中的各个频率成分；2 系统存在多个外激励共振区。除了外激励频率等于系统固有频率的共振区外，当激励频率等于系统固有频率与参数激励频率的组合值时，同样存在共振现象；3 参数振动系统共振响应时，主导频率成分为系统固有频率；4 阻尼使得频响函数峰值有明显下降，而对非共振区的频响曲线影响不大。
Abstract
Utilizing Sylvester’s theorem and Fourier series expansion method, commonly used in the spectral decomposition for matrix, the frequency response functions (FRFs) for parametrically excited system are derived theoretically and the external resonant condition is obtained . Then, a spur-gear-pair parametric vibration system is selected as an example to simulate its frequency response characteristics. The effects of parametric stability, time-varying parameters (parametric frequency and contact ratio) and damping are considered in the simulation. It is shown from both the theoretical and simulation results that the frequency response of the parametric system has the following properties: 1 there are multi-FRFs corresponding to the multi-frequency response for the system; 2 there are multi-outer excitation resonant regions in the system. Besides the resonance caused by the excited frequency equals to the natural frequency, the system will also be external resonant if excitation frequency meets the combination of natural frequency and parametric frequency; 3 When the system is external resonant, the dominant frequency component in the response is the natural frequency; 4 Damping makes the peak values of FRFs drop evidently, while it has almost no impact on the FRFs in non-resonant regions.
关键词
参数振动系统 /
强迫响应 /
频响特性
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Key words
parametric vibrational system /
forced response /
frequency response characteristics
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王建军;;韩勤锴;;李其汉.
参数振动系统频响特性研究 [J]. 振动与冲击, 2010, 29(3): 103-108
Wang Jianjun;;Han Qinkai;Li Qihan.
Frequency Response Characteristics of Parametric Vibrational System[J]. Journal of Vibration and Shock, 2010, 29(3): 103-108
中图分类号：
TH132.4
TB532
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