第33卷(2011)第6期
减振与降噪
柴油机 Diesel Engine
某型发动机啸叫噪声降噪技术研究
王林涛，金永星，梁鹏飞，曾佳，刘佳伟，郭晓宁
（上海齐耀动力技术有限公司，上海201203）
Vol. 33(2011) No. 6
摘要：分析了某型发动机嘴叫噪声的生成机理，结论为啸叫噪声由发动机2130Hz扰动力激发旋转飞轮四辨花振型共振辐射产生。由此提出了飞轮移频的降噪措施，并对飞轮进行结构调整。试验结果表明：该型发动机的嘴叫噪声得到控制，整机空气噪声A声级下降了7.8dB，达到了发动机设计指标要求。
关键词：发动机；嘴叫噪声；.共振；降噪；移频
中图分类号：TK421*，6
文献标识码：A
文章编号：10014357(2011)06-004303
ResearchontheSquealNoiseReductionTechnologyofanEngine Wang Lintao, Jin Yongxing, Liang Pengfei, Zeng Jia, Liu Jiawei, Guo Xiaoning
(Shanghai MicroPowers Co., Ltd., Shanghai201203)
Abstract: Based on an engine, the mechanism of its squeal noise generation was studied. It was conclu ded that the squeal noise was caused by the engine's 2 130 Hz disturbance force exciting the four-leaved flower type resonance radiation of rotating flywheel. Therefore, the method of flywheel frequency shift for reducing the squeal noise was suggested. The mechanical structure of flywheel was redesigned and the test results show that the squeal noise of the engine was controlled. A-weighted sound level airborne noise of the engine was reduced by 7. 8 dB according to the tests, which technically satisfied the design requirements. Keywords: engine; squeal noise; resonance; noise reduction; frequency shift
0引言
某发动机首次试车发现，其运行噪声中夹带着强烈的啸叫噪声，测试得到整机空气噪声A声级为105.5dBA，超过设计指标要求。现场听诊发现，啸叫噪声主要由发动机飞轮端发出。本文分析了该发动机啸叫噪声生成机理，确定了啸叫的信号特征，并提出了降噪措施。
啸叫噪声生成机理分析 1.1啸叫噪声频率成分分析
图1是额定工况下，测试得到的该发动机飞轮端空气噪声声压频谱。可以看出，2130Hz频率的幅值明显高于其它频率下的幅值，结合现场听诊情
况，可确认2130Hz是现场听到的强烈啸叫噪声的频率成分。
0.2 振幅/Pa
数率/H2
图1发动机飞轮端空气噪声声压频谱
收稿日期：2011-04-02
作者简介：王林涛（1982-），男，工程师，主要研究领域为发动机结构系统动态设计，E-mail；wanglintao@micropow
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