基于柴油机瞬时转速的时频域滤波的研究  

Study of Time and Frequency Domain Filtering Based on Diesel Engine Instantaneous Speed

作　　者：刘兰辉[1] 刘玫[1] 王乐[2] 

机构地区：[1]山东大学控制科学与工程学院,济南250061 [2]山推工程机械股份有限公司工程机械研究院,济宁272000

出　　处：《机电一体化》2010年第10期23-26,共4页Mechatronics

摘　　要：在柴油机故障诊断的研究中,对采集到的瞬时转速信号进行滤波处理是必须的。文章首先对信号进行了预处理,去掉发生错误的数据,然后对瞬时转速信号分别进行了时域滤波和频域滤波。时域中采用FIR登波器进行滤波,对不同截止频率的滤波效果进行了比较分析并确定最优;频域滤波中引入全相位滤波思想,在频域内使用频率向量改变瞬时转速信号的频率特性,并在时域内观察滤波效果并进行了分析。时域滤波能达到比较好的滤波效果,但同时也产生了相移;频域滤波效果较时域滤波来说更为平滑、真实,没有相移。In the study of engine fault diagnosis, the instantaneous speed signal of the collected filtering is required. First, the signal was pretreated to remove the error data, and then were on filtering to the instantaneous speed signal in time domain and frequency domain. Time domain filtering using FIR filter, through compare and analysis different cut-off frequency of the filter effects, determine the optimal. Frequency filter introduced the idea of all phase, in the frequency domain using the frequency vector to change the frequency characteristics of the instantaneous speed signal, observed in time domain filtering and analysis. Time domain filtering can achieve a better filtering effect, but it has also produced phase shift, frequency domain filtering is more smooth, true, there is no phase shift.

关 键 词：时域滤波 频域滤波 全相位 频率向量 

分 类 号：TK428[动力工程及工程热物理—动力机械及工程]