哈尔滨工程大学学报Issue(9)：1117-1123,7.DOI:10.3969/j.issn.1006-7043.201308013
提高轴系扭振信号时频转换精度的方法
Accuracy improvement of time-frequency domain transformation in torsional vibration measurement
摘要
Abstract
In order to measure and process torsional vibration signals with high precision, aiming at the sources of error in time-frequency domain transformation ( TFDT) of torsional vibration signals with pulse counting method, two methods for improving the accuracy of TFDT were proposed, including resample with constant interval and mod-ifying formulation of torsional angle. The methods were applied to TFDT of complete cycle and non-complete cycle standard torsional vibration signals, and it is found that the methods developed in this study are effective. The tor-sional angles with constant interval sampling can be obtained directly by the modified formulation to avoid resam-pling, which not only can guarantee the accuracy, but also have no negative effect on computing speed of TFDT. In addition, it is found that the effect of flat-top window on reducing the leakage errors due to blocking of torsional vi-bration signal is the best and the accuracy of TFDT could be improved by increasing the teeth number or using en-coder with higher precision.关键词
轴系扭振/时频转换/等角度采样/等时间采样/窗函数/时域/频域/傅里叶变换/精度分析Key words
torsional vibration of shafting/time-frequency domain transformation/constant angle sampling/constant interval sampling/window function/time domain/frequency domain/Fourier transformation/accuracy analysis分类
数理科学引用本文复制引用
郭宜斌,李玩幽,蔡鹏飞,卢熙群,吕秉琳..提高轴系扭振信号时频转换精度的方法[J].哈尔滨工程大学学报,2014,(9):1117-1123,7.基金项目
国家自然科学基金资助项目（51375104）；中央高校基本科研业务费专项基金资助项目（ HEUCFZ1117）；黑龙江省杰出青年科学基金资助项目（ JC201405）． （）
