本文選題：滾動軸承 + 振動信號��； 參考：《振動.測試與診斷》2017年05期

【摘要】：針對無轉(zhuǎn)速計的瞬時轉(zhuǎn)速估計問題及現(xiàn)有方法在抗噪、抗臨近階次和實時性方面的不足,基于Viterbi算法提出了一種改進型瞬時頻率估計(instantaneous frequency estimation,簡稱IFE)方法,并將其應(yīng)用于變轉(zhuǎn)速工況下滾動軸承的瞬時轉(zhuǎn)速估計。將隱馬爾科夫模型中的Viterbi算法引入轉(zhuǎn)頻估計,分析了某一時頻平面中代價函數(shù)的計算次數(shù);根據(jù)歐幾里得距離函數(shù)的性質(zhì),提出了代價函數(shù)迭代循環(huán)停止的新型判定準則。該準則的優(yōu)點在于可以快速搜索時頻平面,尋找到最優(yōu)的局部路徑,提高了IFE精度和計算速度。通過仿真信號和實驗數(shù)據(jù)對該算法進行驗證。結(jié)果表明:改進后算法效率明顯提高,和基于峰值搜索IFE方法相比,改進的Viterbi-IFE方法具有較高的精度和穩(wěn)定性。
[Abstract]:In view of the problem of instantaneous speed estimation without tachometer and the shortcomings of existing methods in anti-noise, anti-approaching order and real-time, an improved instantaneous frequency estimation method based on Viterbi algorithm is proposed.It is applied to the instantaneous speed estimation of rolling bearing under variable speed condition.The Viterbi algorithm in Hidden Markov Model is introduced to the frequency conversion estimation, and the computational times of the cost function in a time frequency plane are analyzed. According to the properties of the Euclidean distance function, a new decision criterion for the iterative cycle stop of the cost function is proposed.The advantage of the criterion is that the time-frequency plane can be searched quickly and the optimal local path can be found. The IFE accuracy and calculation speed are improved.The algorithm is verified by simulation signal and experimental data.The results show that the improved Viterbi-IFE algorithm is more efficient than the peak search IFE method, and the improved Viterbi-IFE method has higher accuracy and stability.
【作者單位】： 石家莊鐵道大學(xué)機械工程學(xué)院;石家莊鐵道大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(11572206,11472179,U1534204,11372199) 河北省自然科學(xué)基金資助項目(A2015210005,A2016210099) 河北省人才工程培養(yǎng)經(jīng)費資助科研項目(A2016002036)
【分類號】：O211.62;TH133.33

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1 ;Optimum of Interleaving Schemes over Combined Channels[J];Wuhan University Journal of Natural Sciences;1999年03期

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