一种低噪声齿轮室盖板的设计方法

发布时间：2017-12-31 09:05

本文关键词：一种低噪声齿轮室盖板的设计方法　出处：《内燃机工程》2016年06期 　论文类型：期刊论文

【摘要】：采用仿真预测与试验测量相结合的方法对某款直列四缸柴油机前端齿轮室盖板结构响应及噪声辐射进行研究。结合噪声测试、声源识别及模态分析提出一种板面结构低噪声优化思路:噪声测试得到关注频带,声源识别得出关注频带辐射具体位置,模态分析判断辐射噪声位置与模态振型是否重合,若重合则进行结构优化。同时,提出一种通过开孔破坏整体刚度耦合与更换高阻尼材料相结合的低结构噪声优化方法。通过这种方法,使关注频带噪声降低了1.95dB(A),发动机前端整体噪声降低了0.96dB(A)。提出一种简单模拟齿轮室盖板安装状态边界条件的方法:对比齿轮室盖板计算与试验模态振型来调整约束节点位置,对比其固有频率来调整约束节点数。并通过对比优化后齿轮室盖板的试验模态与计算模态,固有频率相对误差为6.97%,验证了边界条件的可行性。
[Abstract]:The structural response and noise radiation of front gear chamber cover plate of a straight four-cylinder diesel engine are studied by using the method of simulation prediction and experimental measurement. Sound source identification and modal analysis put forward a low noise optimization idea of plate structure: noise measurement can get attention frequency band, sound source identification can get specific position of attention frequency band radiation. Modal analysis is used to determine whether the position of the radiated noise is coincident with the modal mode, and if so, the structure is optimized. A low structure noise optimization method is proposed, which combines the coupling of whole stiffness with the replacement of high damping materials by opening. By this method, the frequency band noise of concern can be reduced by 1.95 dB ~ (-A). The overall noise of the front end of the engine is reduced by 0.96 dBU A). This paper presents a simple method to simulate the boundary conditions of gear-chamber cover plate installation: to adjust the position of constrained nodes by comparing the calculation of gear-chamber cover plate with the vibration mode of test mode. The relative error of natural frequency is 6.97, which verifies the feasibility of the boundary condition.
【作者单位】：广西大学机械工程学院;广西玉柴机器股份有限公司;
【基金】：广西自然科学基金项目(2014GXNSFGA118005) 广西高等学校优秀中青年骨干教师培养工程项目(桂教人(2013)16号) 广西科学研究与技术开发计划(桂科攻1598007-44)
【分类号】：TK423
【正文快照】： 0概述柴油机振动与噪声问题一直是一个研究难点。而如何减少振动噪声辐射使其满足法规要求及乘客需求也成为了研究热点之一。尤其对乘用车柴油机而言,在实际使用中表现出噪声辐射较大的主要原因在于柴油机的怠速噪声比汽油机高约10dB(A)[1],因此减少柴油机怠速工况噪声辐射是

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