采样点数和采样频率对基于加窗插值算法弧焊电源PWHD的影响  

Influence of sampling points and sampling frequency on arc welding power source's PWHD measurement based on windowed interpolation algorithm

作　　者：管金栋 陈树君[1] 

机构地区：[1]北京工业大学机电学院汽车结构部件先进制造技术教育部工程研究中心,北京100124

出　　处：《焊接》2017年第4期59-63,共5页Welding & Joining

基　　金："高档数控机床与基础制造装备"科技重大专项(2014ZX04001171);国家自然科学基金(10001790201501)

摘　　要：为了减少测量PWHD(Partial Weighted Harmonic Distortion,局部加权谐波畸变率)的误差,将加汉宁(Hanning)窗插值谐波分析法、4阶布莱克曼-哈里斯(Blackman-Harris)窗插值谐波分析法和纳托尔(Nuttall)窗插值谐波分析法分别用于PWHD的测量。介绍了这三种加窗插值谐波分析算法的原理,比较了它们受采样点数和采样频率的影响上的差别。依据GB 15579.10—2008《弧焊设备电磁兼容性要求》,通过试验分析在不同窗函数下采样点数和采样频率对弧焊电源PWHD的影响。试验结果表明:采用加Hanning窗的加窗插值算法无法得到精度较高的PWHD值,而采用加4阶Blackman-Harris窗以及Nuttall窗的加窗插值算法可以得到精度较高的PWHD值,其中加Nuttall窗的加窗插值算法性能最优。In order to reduce the error of measuring PWHD( Partial Weighted Harmonic Distortion),Hanning windowed interpolation harmonic algorithm,4 order Blackman-Harris windowed interpolation harmonic algorithm and Nuttall windowed interpolation harmonic algorithm were used to measure PWHD. The principle of the three algorithms were introduced,accuracy influence of sampling points and sampling frequency were compared. Based on GB15579.10 arc welding equipment electromagnetic compatibility requirements,this article analyzed the influence sampling points and sampling frequency to the welding power source's PWHD under different window functions through experiment. The experiment results show that the higher accuracy PWHD value cannot be obtained by using Hanning windowed interpolation algorithm,while the higher accuracy PWHD value can be obtained by using 4 order Blackman-Harris windowed interpolation algorithm or Nuttall windowed interpolation algorithm and the performance of Nuttall windowed interpolation algorithm is the best.

关 键 词：弧焊电源 采样点数 采样频率 窗函数 PWHD 

分 类 号：TG40[金属学及工艺—焊接]