DSpace community: 車輛科技研究所
http://ir.ncue.edu.tw/ir/handle/987654321/24
車輛科技研究所The community's search engineSearch the Channels
http://ir.ncue.edu.tw/ir/simple-search
A Fault Diagnosis System for a Mechanical Reducer Gear-Set Using Wigner-Ville Distribution and an Artificial Neural Network
http://ir.ncue.edu.tw/ir/handle/987654321/18471
title: A Fault Diagnosis System for a Mechanical Reducer Gear-Set Using Wigner-Ville Distribution and an Artificial Neural Network abstract: This paper describes a fault diagnosis system for mechanical reducer gear-sets using Wigner-Ville distribution and artificial neural network techniques. Reducer gear-sets are used in various traditional and modern industries. In the production of a reducer, the vibration and noise signals of the gear-set are usually used to determine the defective products or defective positions. Unfortunately, conventional fault diagnosis by humans is limited effectiveness and has no numerical standards. In the present study, the vibration signal of the gear-set is used to evaluate the proposed fault diagnosis technique. In the experimental work, feature extraction by Wigner-Ville distribution is proposed for analyzing fault signals in the reducer gear-set platform. Artificial neural network techniques using both a general regression neural network and conventional back-propagation network are compared in the system. The experimental results show the vibration can be used to monitor the condition of the gear-set platform and the general regression neural network (GRNN) has a better recognition rate and less recognition time than the back-propagation neural network (BPNN)
<br>引擎正時齒輪與汽門間隙之智慧型故障診斷
http://ir.ncue.edu.tw/ir/handle/987654321/18470
title: 引擎正時齒輪與汽門間隙之智慧型故障診斷 abstract: 傳統的汽車引擎故障檢測技術對於引擎內部機件所造成的異常聲訊與振動還是無法精確判斷,在以往都是依靠經驗豐富的老技師憑著維修經驗,甚至嘗試錯誤法的原則找出故障原因,以至於無法提升維修效率與速度。本文中提出一套智慧型專家系統,分別利用加速規與麥克風收錄實驗中所設定的故障聲音訊號與振動訊號,將擷取之訊號利用離散小波轉換技術作為特徵擷取的方法,從訊號中找出所隱含的特徵向量,在智慧型分類的步驟中,也分別採用監督式學習與非監督式學習的所代表的分類器,如倒傳遞類神經與支持向量基,在此作為相互的比較。實驗結果顯示本文所提出的智慧型診斷技術能得到較好的辨識速度與判別結果。
<br>利用離散小波及支援向量機判別引擎正時齒輪及汽門間隙故障
http://ir.ncue.edu.tw/ir/handle/987654321/18468
title: 利用離散小波及支援向量機判別引擎正時齒輪及汽門間隙故障Fault Analysis of Engine Timing Gear and Valve Clearance Using Discrete Wavelet and a Support Vector Machine
http://ir.ncue.edu.tw/ir/handle/987654321/18469
title: Fault Analysis of Engine Timing Gear and Valve Clearance Using Discrete Wavelet and a Support Vector Machine