縫紉機之噪音診斷與改善

Noise Diagnosis and Improvement of a Sewing Machine

王仁品(Ren-Pen Wang)

指導教授 ： 楊大中

元智大學/工程學院/機械工程學系/碩士(2011年)

摘要

本研究主要目的為縫紉機之噪音診斷與改善。測試以隔音材料遮蔽部分機殼，拆除縫紉機零件，或改變操作條件進行，例如：拆除機身上半部軸承、改變轉速、調整縫紉機之運作行程。實驗結果顯示，機身振動與噪音的關係不大，降低振動無法使噪音值減少。經由噪音頻譜量測，得知噪音源為內部機件之摩擦或碰撞所造成。噪音由內部眾多機件之間的相對運動摩擦或間隙碰撞所加總累積，必須從多處進行局部改善。建議的改善方式為：調整對噪音影響部位之間隙公差，如連桿機構、滑動件、往復運動件等之部位，更換供油泵浦之驅動蝸齒輪對。此外，測試吸音與隔音方法，因縫紉機內部空間狹隘，難以有足夠面積貼附隔音與吸音材，實際降噪效益不佳。

關鍵字

縫紉機，噪音，診斷，振動

並列摘要

Noise diagnosis of a sewing machine was conducted in this study. The experiment was performed by partly covering the machine body by noise insulation blankets, taking parts out of the sewing machine, changing the operating speeds, adjusting the stroke of the needle, etc.. The results show that the correlation between the noise and the vibration of the machine body is low. Reducing the vibration levels does not decrease the node level simultaneously. Concluded from the experimental results, the noise is very possibly generated and accumulated by friction and collision between the parts inside the machine, as also indicated by the frequency spectrum of the noise. The suggested improvements are changing the clearance and fitness in the linkages and sliding pairs, and replacing the worm gearing of the oil supply pump. Installation of noise absorption or insulation materials inside the machine proved to have negligible effects on noise reduction because the compact design of the machine makes the enough coverage of the materials inside the machine infeasible.

並列關鍵字

Sewing Machine ； Noise ； Diagnosis ； Vibration

參考文獻

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