振动与冲击
振動與遲擊
진동여충격
JOURNAL OF VIBRATION AND SHOCK
2015年
18期
19-24,32
,共7页
故障诊断%自适应多阶比分析%瞬时频率%角域重采样
故障診斷%自適應多階比分析%瞬時頻率%角域重採樣
고장진단%자괄응다계비분석%순시빈솔%각역중채양
fault diagnosis%adaptive multiple-order tracking%instantaneous frequency%angle domain resampling
提出一种利用自动搜峰的瞬时频率估计技术来实现旋转机械自适应多阶比分析（Adaptive Multiple Order Tracking，AMOT）的新方法。首先，通过时频分析得到振动信号的时频分布，根据频率峰值坐标自动选取搜峰起始点，自适应搜索出不同阶比分量的时频峰值。其次，利用最小二乘法将不同频率分量进行拟合实现瞬时频率估计，然后根据参考分量计算出重采样的鉴相时标对原始信号进行重采样，最后通过 FFT 变换实现阶比分析。该方法通过瞬时频率估计能够自动识别出所有阶比分量，实现优中选优，避免了传统算法中人为直观选取一个分量进行遮掩滤波提取分量的方法，减少了人为选取分量及起始点造成的误差，具有自适应性。并且无需同步采集转速信号，大大简化了应用条件，同时减少了人为因素，提高了分析精度，为旋转机械故障诊断提供了新方法。仿真实验和应用实例验证了方法的有效性。
提齣一種利用自動搜峰的瞬時頻率估計技術來實現鏇轉機械自適應多階比分析（Adaptive Multiple Order Tracking，AMOT）的新方法。首先，通過時頻分析得到振動信號的時頻分佈，根據頻率峰值坐標自動選取搜峰起始點，自適應搜索齣不同階比分量的時頻峰值。其次，利用最小二乘法將不同頻率分量進行擬閤實現瞬時頻率估計，然後根據參攷分量計算齣重採樣的鑒相時標對原始信號進行重採樣，最後通過 FFT 變換實現階比分析。該方法通過瞬時頻率估計能夠自動識彆齣所有階比分量，實現優中選優，避免瞭傳統算法中人為直觀選取一箇分量進行遮掩濾波提取分量的方法，減少瞭人為選取分量及起始點造成的誤差，具有自適應性。併且無需同步採集轉速信號，大大簡化瞭應用條件，同時減少瞭人為因素，提高瞭分析精度，為鏇轉機械故障診斷提供瞭新方法。倣真實驗和應用實例驗證瞭方法的有效性。
제출일충이용자동수봉적순시빈솔고계기술래실현선전궤계자괄응다계비분석（Adaptive Multiple Order Tracking，AMOT）적신방법。수선，통과시빈분석득도진동신호적시빈분포，근거빈솔봉치좌표자동선취수봉기시점，자괄응수색출불동계비분량적시빈봉치。기차，이용최소이승법장불동빈솔분량진행의합실현순시빈솔고계，연후근거삼고분량계산출중채양적감상시표대원시신호진행중채양，최후통과 FFT 변환실현계비분석。해방법통과순시빈솔고계능구자동식별출소유계비분량，실현우중선우，피면료전통산법중인위직관선취일개분량진행차엄려파제취분량적방법，감소료인위선취분량급기시점조성적오차，구유자괄응성。병차무수동보채집전속신호，대대간화료응용조건，동시감소료인위인소，제고료분석정도，위선전궤계고장진단제공료신방법。방진실험화응용실례험증료방법적유효성。
A new method of adaptive multi-order tracking (AMOT)in rotating machinery was proposed based on the instantaneous frequency estimation with an adaptive peak search algorithm.The time-frequency distribution was obtained by using a certain time-frequency analysis method.According to the frequency peak coordinate,the starting point of peak search was selected automatically and time-frequency peaks of different orders were searched adaptively.The different frequency components were fitted to achieve the instantaneous frequency estimation by using the least square polynomial,and then the resampling time was calculated according to the reference component to resample the original signal.Finally multi-order tracking spectrums were obtained by FFT transform.By virtue of the method of instantaneous frequency estimation,the proposed method can automatically identify all-order components and choose the best one, avoiding the human error owing to choosing reference component and starting point subjectively in traditional algorithms. The method can identify the components of different orders without sampling synchronously the speed signal,greatly simplify the application conditions and improve the accuracy of analysis.It provides a new method for fault diagnosis of rotating machinery.The method was proved to be effective by simulation examples and practical applications.
