摘要
通过仿真和试验分析了铣削功率信号波形，解释了切削点至功率信号测量点之间中间环节对负载变化的滤波作用．仿真和试验揭示，当铣削负载发生突变时，在电动机输入功率信号的波形中会产生阶跃响应波动；由功率负载突变引起的阶跃响应波动，其周期对一定的主电动机功率测量系统（包括主传动系统和功率变送器）为常数τ（本试验系统的τ≈０．０８ｓ）；当齿切削周期（等于铣削频率的倒数）小于阶跃响应波动周期的１／２时，铣削功率信号时域波形中的主峰值会发生粘连现象，表现为对负载波动频率的低通滤波效应（低通滤波截止频率为２／τ），从而造成功率信号中的负载波动特征减弱甚至消失．
The waveforms of cutting power signals in milling are investigated to explain the low pass effects of the system between cutting point and measuring point upon the measured power signals. It is shown by the simulations and experiments that with a sudden cutting load change there will be a step response in the measured power signal and for a given spindle drive motor input power measuring system (including spindle drive system and power transducer) the period of the response is a constant τ (in this paper's system τ is about 0.08 s). When the tooth passing period is less than half of the step response period, there will be an interference among major peaks of neighboring cutting teeth in the time domain power signal which demonstrates a low pass effects upon cutting load pulsation frequency (the cut off frequency is 2/ τ ) and weakens the cutting load features or even causes them to vanish in the power signals.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1998年第5期49-52,共4页
Journal of Shanghai Jiaotong University
关键词
功率信号
低通滤波
铣削
仿真
试验
故障诊断
metal cutting
cutting tests
power measurement
signal process
condition monitoring
