以超音波量測已磨耗汽車離合器片之研究

Research on Retired Automobile Clutch Plates by Ultrasonic Measurement

本研究是用非破壞檢測超音波掃描，量測已磨耗之汽車離合器片接觸面積大小變化，運用LabVIEW軟體控制超音波探頭取得離合器片數據，再將數據利用MATLAB轉成2D接觸圖形，最後使用ImageJ二值化功能計算黑色面積影像量測接觸10% ~ 100%面積圖。
實驗過程乃將離合器片分成24等份進行量測，取對比度100%面積，算出接觸面積大小變化情形，再施加負載2.5 kgw得出接觸面積介於96.536 mm2~ 205.162 mm2，負載5 kgw時接觸面積介於116.671 mm2 ~ 227.311 mm2，7.5kgw之接觸面積介於151.214 mm2 ~ 288.701 mm2，10 kgw之接觸面積介於194.305 mm2 ~ 372.148 mm2，已磨耗下的離合器片接觸面積從96.536 mm2 ~372.148 mm2之間，面積有逐漸增的情形，實驗得知不同編號相同力量顯示，結果對比得知彼此之間接觸面積數據有明顯落差過大的情形，由此可推論整圈離合器片有磨耗不均的情形，研究結果可對離合器片使用情形有助於行車安全並提供維修技師對離合器片磨耗作為汰換之參考。

This study uses non-destructive ultrasonic scanning to measure the change of the contact area of the worn automobile clutch disc. LabVIEW software is used to control the ultrasonic transducer for scanning in order to obtain the clutch plate data, and then the data is converted into 2D contact graphics using MATLAB. Finally, apackage analysis tool, ImageJ, is used to calculate the contact area between different contact degrees from 10% to 100%.
In the experiment process of this study, the clutch plate is divided into 24 equal parts for scanning, and the 100% contrast area, the change in the size of the contact area. Under the load of 2.5 kgw, the contact area is between 96.536 mm2 and 205.162 mm2, under 5kgw load is 116.671 mm2 ~227.311 mm2, 7.5 kgw is 151.214 mm2 ~288.701 mm2, and 10 kgw is 194.305 mm2 ~372.148 mm2. There is agradual increase in the contact area. The experiment shows that the contact area varied under different loading forces. It can be deduced that the wear of the clutch disc is not even on the whole plate. The research results are helpful to driving safety in the use of the clutch disc and provide maintenance technicians with data on the wear of the clutch disc as areference for replacement.