摘要
为了使运行模态分析适用于含有谐波激励的情况,对随机信号和谐波信号统计特性进行分析,根据两种信号概率密度曲线的不同,提出一种识别响应信号中周期强迫响应的方法。对一块由电机激励的平板进行了运行模态和传统模态试验,验证了识别方法的有效性。针对某一国产轿车室内噪声大的问题,进行了运行时模态测试,分离出响应信号中的周期响应成分,得到了真实运行环境下的整车模态参数,这对该车问题的解决具有一定的意义,同时也验证了该方法具有实际应用价值。
In order to make the operational modal analysis (OMA) applicable to engineering systems undergoing harmonic excitation, a method of distinguishing the for ced harmonic response from measured vibration signals was presented through th e analysis of the statistical properties of stochastic and harmonic signa ls. An OMA and an experimental modal analysis of a steel plate excited by a motor were performed, which proved the effectiveness of the method. Taking the booming problem of a home-made car into consideration, an OMA of the car was performed under its working conditions. From the analysis, the harmonic compone nts were successfully separated from the overall response and the modal parameters o f the car were obtained, which provided the guidance for solving the booming problem and also proved that the method has practical value.
出处
《振动．测试与诊断》
EI
CSCD
2008年第3期197-200,共4页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(编号:50535010)
关键词
运行模态分析
谐波模态
汽车振动
频域分解
operational modal analysis harmonic mode automobile vibration frequency domain decomposition
