基于DCT的旋转机械振动信号无相移滤波方法研究  

Study on the DCT-based Vibration Signal Zero Phase Distortion Filter Method in Rotating Machinery

作　　者：管博[1] 胡劲松[1] 

机构地区：[1]宁波工程学院电信学院,宁波315010

出　　处：《汽轮机技术》2007年第4期285-287,共3页Turbine Technology

基　　金：国家自然科学基金资助项目;项目编号:50675194;宁波市自然科学基金资助项目;编号:2007A610014

摘　　要：把离散余弦变换(Discrete Cosine Transform,DCT)无相移滤波方法引入了旋转机械振动信号处理领域。采用该方法的步骤为:先将输入数据进行DCT变换,将变换后的数据根据压缩率保留前面的数据,抛弃后面的数据,然后把保留的数据补0到原始数据长度,再进行DCT逆变换,就获得了滤波后的数据。通过对旋转机械油膜涡动振动信号的试验研究表明,基于DCT的无相移滤波方法不但能把振动数据进行无相移滤波处理,而且可以压缩数据。该研究成果能广泛地用于旋转机械振动信号滤波、压缩领域。The discrete cosine transform （DCT）Zero Phase Distortion Filter method was introduced to the field of rotating machinery vibration signal process. The steps of the method is that, at first, the input serial was transformed using DCT, secondly, reserve the forepart of the transformed signal based on the preconcerted compression rate and discard the remainder, thirdly, fill up zeros at the end of the reserved data to the length of the original data, then applied inverse DCT to the filled up data, the filtered data was formed. An experiment was researched using the method, results showed that the method has ability to filter the vibration signal with zero phase distortion and compress the data automatically. The result of the study can be generally used in rotating machinery vibration signal filter and compress process field.

关 键 词：旋转机械 振动信号 离散余弦变换(DCT) 无相移滤波 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置] TH113.1[自动化与计算机技术—控制科学与工程]