工业平缝机噪声源定位与低噪声结构设计  

Noise Source Identification and Low-noise Structure Design for Industrial Sewing Machines based on Partial Coherence Analysis

作　　者：黄彩霞[1,2] 杨振东[2] 曹申[2] 龚寄[2] HUANG Caixia;YANG Zhendong;CAO Shen;GONG Ji(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;College of Mechanical Engineering,Hunan International Economics University,Changsha 410205,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南涉外经济学院机械工程学院,长沙410205

出　　处：《噪声与振动控制》2018年第5期239-243,248,共6页Noise and Vibration Control

基　　金：湖南省教育厅科研项目资助(16C0906);湖南省大学生研究性学习和创新性实验计划资助项目(湘教通[2016]283)

摘　　要：为了确定工业平缝机的噪声源,进而开展低噪声结构设计,首先进行平缝机振动与噪声信号测试实验,通过振动与噪声信号的时域分析,确定出机架产生共振是导致噪声峰值产生的原因;通过振动加速度信号与噪声声压信号的常相干分析和重相干分析,确保振动加速度信号能准确解释噪声声压信号。然后通过振动与噪声信号的偏相干分析,确定机架Z方向的振动为噪声产生的主要原因,机架应作为平缝机低噪声结构设计对象。最后基于噪声源定位结果,进行机架低噪声结构设计。实验结果证明,改进后的机架能降低平缝机运行噪声,证明噪声源定位结果有效。In order to identify the noise sources of industrial sewing machines so that the low-noise structure optimization can be performed,a vibro-acoustic experiment for sewing machines is implemented.Through analyzing the signals of vibration acceleration and noise pressure in time domain,it is found that the noise peak is resulted from the resonance of the frame of the sewing machine.The methods of conventional coherence analysis and multiple coherence analysis are applied to the signals processing of vibration acceleration and noise pressure so that the signal of vibration accelerations of three test points can accurately interpret the signal of noise pressure.Applying the partial coherence analysis method to the signals of vibration acceleration and noise pressure,it is identified that the main source of noise is the vibration of sewing machine’s frame in the Z-direction.So,the machine’s frame should be taken as the object for low noise structure design.Finally,based on the noise source identification results,a low noise structure design of sewing machine's frame is implemented.The vibro-acoustic experiment of sewing machines has verified that the improved frame can reduce the operation noise of the industrial sewing machines and proved that the result of noise source identification is correct and effective.

关 键 词：声学 工业平缝机 重相干分析 偏相干分析 噪声源定位 低噪声结构设计 

分 类 号：TB53[理学—物理]