機械噪音測量和診斷定制程序：雙螺桿壓縮機之應用

Machinery Noise Measurement and Diagnosis Customized Procedure: Application to Twin Screw Compressor

王栢村(Bor-Tsuen Wang) ； 王文志(Wen-Chih Wang) ； 王廷維(Ting-Wei Wang) ； 黃啟順(Chi-Shun Huang)

《中華民國振動與噪音工程學會論文集》 2013 (2013/06) Pp. 57-64

摘要

機械噪音問題，一直是相關領域之業界欲了解與解決的重點之一，而噪音量測與診斷流程建立，有助於廠商提升研發及品管之效率，因此建立標準化量測與診斷作業流程為本文之主軸。本文首先闡述噪音源（Source）、傳輸路徑（Path）與收受端（Receiver）之理念，並以雙螺桿壓縮機為例，建立噪音量測程序與診斷流程，量測程序方面可分為收受端測試與路徑測試兩部分，其收受端測試為探討雙螺桿壓縮機於不同工作狀況下之噪音特性與結構振動之關聯性分析，主要利用量測獲得的自身功率頻譜密度函數，透過轉換1/3八音頻帶與總聲音壓力位準來進行分析，而路徑測試為進行實驗模態分析，擷取結構模態參數，其目的為探討雙螺桿壓縮機之高噪音可能來自結構共振效應，本文將以雙螺桿壓縮機為例進行噪音診斷，進而建立一套噪音診斷流程，結果顯示1/3八音頻帶中高噪音貢獻度頻帶，主要來自轉子嚙合頻率，並經路徑噪音診斷得知可能有結構自然頻率與嚙合頻率共振效應，未來本文所建立量測程序與診斷流程，亦可應用於不同機械噪音量測與診斷作業之參考。

關鍵字

量測與診斷 ； 收受端測試 ； 路徑測試 ； 1/3八音頻帶 ； 實驗模態分析

並列摘要

Machinery noise is of concern for industry. This work aims to develop the customized noise measurement and diagnosis procedure to solve the noise problem for machineries. First, the idea for noise source, transmission path and receiver is introduced, in particular for a twin screw compressor. The receiver tests by measuring the noise emission and structural vibration from the compressor are planned. The overall sound pressure level (SPL) can be obtained from the measured 1/3 octave band SPL that is determined by the auto power spectral density (PSD) function or simply the linear auto spectrum of SPL. The path test is generally by performing experimental modal analysis (EMA) on the structure to obtain structural modal parameters. Structural natural frequencies are particularly of interest to examine possible resonance effect due to structural vibration. The case study of noise measurement and diagnosis on the twin screw compressor is illustrated. The high noise level can be identified from 1/3 octave band analysis for the major contribution of noise bands. The linear auto spectrum can then be examined to show the source of noise bands from the twin rotors mesh frequencies as well as some possible structural resonances. This work lays out the experimental procedure for noise and vibration receiver tests as well as the path test on the twin screw compressor. The systematic approach can also be adopted for other machineries.

並列關鍵字

Measurement and Diagnosis ； Receiver test ； path test ； 1/3 Octave band ； experimental modal analysis