电阻点焊过程动态信号的时频分析  

Dynamic signals' time-frequency analysis of resistance spot welding process

作　　者：张宏杰[1] 侯妍妍[2] 

机构地区：[1]天津工业大学红桥校区,天津300134 [2]河北省行政学院,石家庄050031

出　　处：《天津工业大学学报》2007年第2期80-84,共5页Journal of Tiangong University

摘　　要：针对电阻点焊机焊点的质量在线监测问题,设计了一套点焊过程动态信号采集与处理系统,同步采集点焊过程电极间电压、焊接电流和电极位移信号,通过短时傅立叶变换、小波变换对信号进行时域-频域分析,确立了动态信号时域、频率特征与焊点形核过程的对应关系.As regards the dynamic welding quality monitor online, the dynamic signal gathering and disposal system of resistance spot welding is established. The electrode voltage, welding current and electrode displacement signals are synchronously gathered. By means of short-time Fourier Transform （STFT） and wavelet transform, the time and frequency characteristic of signals are analyzed and the relation between signal time and frequency characteristic and the welded spot＇s growing process are researched.

关 键 词：电阻点焊 时频分析 短时傅立叶变换 小波分析 

分 类 号：TB526[理学—物理] TG438.2[理学—声学]