In this study , based on bispectrum and bicoherence extraction of vibration acceleration signals at spindle end of a vertical machining center while milling operation , change rules of bispectrum and bicoherence of the signals were analyzed for the progressive wearing process of the flank wear land of the milling cutters 通过提取铣削加工过程中机床主轴端振动加速度信号的双谱及其双相干系数，分析了铣刀后刀面渐进磨损过程双谱及其双相干系数的变化规律。
A lot of classical lpfs are designed for the filtering of acceleration signal , then the direction of filters " optimization is put forward in terms of the performance analysis of the filters and the filtering results . two adaptive filtering algorithms based on gratitude search are also discussed 设计了多种对加速度信号进行滤波的经典数字低通滤波器，通过对滤波器的性能分析和滤波结果比较，总结了滤波器的优化方向；讨论了基于梯度搜索的两种自适应滤波算法。
Statistics and analysis of amplitude domain parameters of the vibration acceleration signal measured during closing of the pump valve shows that , by using this diagnosis method , the feature information of the pump valve failure can be extracted effectively , and the failure information features are rather obvious 通过对测取的三缸泵阀箱上泵阀关闭过程振动加速度信号的幅值域多参数的统计分析证明，采用振动信号幅值域多参数诊断法可有效提取泵阀失效故障的特征信息，且故障信息特征非常明显。
Testing the vibration acceleration signal of rail top ( lateral and vertical ) , rail middle ( lateral ) , rail bed side ( vertical ) and rail bed middle ( vertical ) with dasp vibration testing system , calculation of signals obtains the power spectral density and frequency response curves of different position 测试横向和垂向激振力下钢轨不同部位的振动信号,进行频谱分析,得出不同部位的频率响应曲线。通过对频响曲线的分析,得出不同方向激振力下钢轨振动能量集中的频率,确定不同方向激振力下钢轨的主要振动部位和振动形式。
Using fourier transformation computational method , the fir filter was designed . the acceleration signal dynamic error was revised through the fft 、 ifft and frequency correction in the operating frequency scope . the signal processing had been realized on dsp , and the signal data was really recorded 应用傅里叶变换的计算方法,并且完成了fir滤波器的设计,通过傅里叶正反变换和频率补偿实现工作频率范围内加速度信号动态误差修正,在dsp上实现了信号处理,真实地记录了信号数据。
