摘要
提出了用“ZOOMBDFT”(聚焦细化大容量数据谱分析)法高精度求系统阻尼比的途径和计算实例,文内指出了国内外常规1K字节FFT计算系统阻尼比的不合理性,指出了采样时间长度T是影响频域用半功率带宽法求阻尼比精度的关键因子。
In this paper,a new method of high precision calculation for damping ratio,namedZOOMBDFT' and some examples are introduced.It is poined out that the traditional method of 1K bytes FFT is not appropriate to the calculation of structural damping ratio,and the key tactor affecting the precision in the calculation by using half power bandwidth method lies in the sampling duration T.Two criteria upon which to guarantee the accuracy in the damping calculation are set up.
出处
《振动.测试与诊断》
EI
CSCD
1997年第2期42-46,共5页
Journal of Vibration,Measurement & Diagnosis
关键词
阻尼比
聚焦细化
数量谱分析
振动控制
damping ration,zoom transform,calculation of damping ratio in the frequency domain ,large capacity data fourier transform