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随机振动试验中时域随机化技术的研究
引用本文:王述成,陈章位.随机振动试验中时域随机化技术的研究[J].机械工程学报,2005,41(5):230-233.
作者姓名:王述成  陈章位
作者单位:浙江大学流体传动及控制国家重点实验室,杭州,310027
摘    要:分析了目前时域随机化技术中直接加窗重叠所存在的频谱泄漏以及控制动态范围低等缺陷,针对这些缺陷进行了理论推导以及进行了基于不同加窗函数的控制试验对比,分析出了加窗函数造成频谱泄漏的主要原因。经过比较,采用了低旁瓣的汉宁窗,但又引入了时域周期性波动的新问题。最后在理论推导以及大量控制试验的基础上提出了以汉宁窗为加窗函数,在时域进行幅值修正的方法,并给出了幅值修正的系数公式。该方法成功地解决了频谱泄漏、控制动态范围低以及加窗造成时域信号周期性波动等问题,提高了系统的频谱控制精度和控制动态范围,并应用于实际随机振动试验控制系统中,取得很好的控制效果。

关 键 词:随机振动试验  时域随机化  加窗重叠
修稿时间:2004年9月20日

RESEARCH ON THE RANDOMIZATION OF RANDOM TEST INVIBRATION CONTROL SYSTEM
Wang Shucheng,CHEN Zhangwei.RESEARCH ON THE RANDOMIZATION OF RANDOM TEST INVIBRATION CONTROL SYSTEM[J].Chinese Journal of Mechanical Engineering,2005,41(5):230-233.
Authors:Wang Shucheng  CHEN Zhangwei
Abstract:Overlap-add method is always used to realize randomization in random vibration control system. Spectral leakage and poor control dynamic introduced by overlap-add method exist in many vibration control systems. On the study of the overlap-add method and doing many random vibration tests applying various windows, the reason of the problems is found out. By comparing the spectral characters of various windows, hanning window is suitable for randomization in random vibration test, but it introduces intensity fluctuations to the time signals. Therefore, a new method is brought out. Based on applying harming window on original random signals, the amplitude is overlap-added and compensated in time domain. This method eliminates spectral leakage and fluctuations, improves control dynamic greatly, and is in good agreement with the experimental test.
Keywords:Random vibration test Randomization Overlap-add  
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