CAJ | 학술논문

通过对旋转机械变速运行齿轮箱振动研究，提出基于频移及谱线编辑的齿轮故障窄带解调分析方法。对齿轮箱变速等非稳态信号进行时域同步采样，利用阶比跟踪对时域信号等角度重采样转换为角域准平稳信号，克服转速波动对信号分析产生的频率模糊现象；对角域信号进行同步平均削弱与转速无关的频率成分，提高信噪比；对平均信号进行窄带解调分析，通过对阶比谱自动编辑分离出齿轮故障主要啮合阶比分量后恢复到角域信号，进行幅值解调及基于频移的相位解调，据幅值解调及相位解调波形图提取齿轮故障特征。结果表明，基于频移、谱线编辑的齿轮故障窄带解调分析方法能有效提取齿轮故障特征信息。
통과대선전궤계변속운행치륜상진동연구，제출기우빈이급보선편집적치륜고장착대해조분석방법。대치륜상변속등비은태신호진행시역동보채양，이용계비근종대시역신호등각도중채양전환위각역준평은신호，극복전속파동대신호분석산생적빈솔모호현상；대각역신호진행동보평균삭약여전속무관적빈솔성분，제고신조비；대평균신호진행착대해조분석，통과대계비보자동편집분리출치륜고장주요교합계비분량후회복도각역신호，진행폭치해조급기우빈이적상위해조，거폭치해조급상위해조파형도제취치륜고장특정。결과표명，기우빈이、보선편집적치륜고장착대해조분석방법능유효제취치륜고장특정신식。
Through analyzing gearbox vibration signals under varying speed conditions of rotating machinery,a method of analyzing gear fault based on narrowband demodulation with frequency shift and spectrum edit was proposed.A time-domain signal was sampled under varying speed condition of gearbox and resampled at constant angle increments with the help of order tracking.The signal was thus converted into a stationary signal in the angle-domain,which can overcome the frequency blur caused by rotating speed fluctuation.Then,the angle-domain signal was processed by signal synchronous average in order to weaken the frequency components irrelevant to speed and to improve the signal to noise ratio.The averaged signal was demodulated and after seperating the main meshing order components of the gear fault from the automatically edited order spectrum,the signal was recovered to the angle-domain signal which was further processed by using amplitude and phase demodulation based on the frequency shift.The fault features of gear were finally extracted in accordance with the demodulated waveform diagrams.The simulations and tests were conducted respectively to verify the validity of the proposed method.