Research of Noise Mechanism and Performance Improve of DVC Drum

Abstract

Based on the structure and working principle of DVC Drum, noise and vibration characteristics of mechanical noise, electromagnetic noise and radiated noise of DVC drum was analyzed comprehensively and systematically. FEA was done to DVC drum and four order natural vibration modes were got. Noise resource of DVC drum had been identified and recognized by the method of cepstrum analysis and it was consistent with the experimental result. And specific ways used wavelet analysis to identify noise resource and diagnose fault was got. The method of noise resource identification was expanded and noise resource of DVC drum was identified accurately. Targeted design improvements were done to inner diameter of bottom drum, process of hot extrusion, connect method of tray bracket in high temperature tester, operating method in production line and packing method. Then fraction defective of DVC drum noise was reduced from 2.5% to 0.6%.It had important practical significance to research on vibration and noise reduction of similar products.