不等齿距锯片振动噪声控制的研究

发布时间：2018-01-28 23:06

本文关键词： 热锯机圆锯片振动噪声不等齿距有限元边界元　出处：《燕山大学》2013年硕士论文　论文类型：学位论文

【摘要】：圆盘锯作为热锯机工况下的主要噪声源，其振动与噪声控制一直以来都是难以解决的工程问题。然而，由于不等齿距锯片减振降噪问题中涉及到复杂的力学、信号、声学等知识，到目前为止，还没有文献对不等齿距锯片振动噪声问题进行详细的研究。论文以φ2000锯片为研究对象，首先分析了影响锯片噪声辐射的主要因素，然后研究了不等齿距锯片的部分设计参数对其降噪效果的影响，从而为变齿距锯片结构参数优化提供指导性建议。主要研究内容如下：（1）建立了热锯机锯切时单齿和多齿的锯切力模型，，基于频谱先能量分布理论论述了不等齿距锯片减振降噪的机理。（2）分析了锯切工况下锯齿所受锯切脉冲力偏置的原因，利用有限元法分别对圆锯片受偏置的径向脉冲力和切向脉冲力的作用下的噪声辐射机理进行了研究。利用有限元研究了圆锯片受单齿径向脉冲力时锯片厚度、锯片直径、夹径比对锯片加速度噪声的影响规律。（3）利用MATLAB对锯切力时域波形进行仿真并对不等齿距锯片的齿间角进行了优化，基于频谱线能量分布理论分析了齿间角类型、分组齿数对不等齿距锯片降噪效果影响规律。（4）结合有限元法和边界元法对不等齿距锯片工况下产生的振动和噪声进行仿真，验证不等齿距片的齿间角类型和分组齿数对锯片降噪效果的影响规律。
[Abstract]:As the main noise source of hot sawing machine, the vibration and noise control of circular saw is always a difficult engineering problem. However, the vibration and noise reduction of saw blade with unequal tooth spacing involves complex mechanics. Up to now, there is no detailed research on vibration and noise problem of unequal pitch saw blade. This paper takes 蠁 2000 saw blade as the research object. Firstly, the main factors affecting noise radiation of saw blade are analyzed, and then the effect of some design parameters of unequal pitch saw blade on the noise reduction effect is studied. The main contents of this paper are as follows: (1) to provide guidance suggestions for the optimization of structural parameters of the saw blade with variable tooth spacing. 1) the model of single and multi-tooth sawing force in hot sawing machine is established. Based on the theory of spectrum first energy distribution, the mechanism of reducing vibration and noise of saw blade with unequal tooth spacing is discussed. 2) the reason of the bias of the cutting pulse force on the saw teeth under the sawing condition is analyzed. The noise radiation mechanism of circular saw blade under the action of offset radial pulse force and tangential pulse force is studied by using finite element method, and the thickness of circular saw blade subjected to single tooth radial pulse force is studied by finite element method. The influence of saw blade diameter and clip diameter ratio on the acceleration noise of saw blade. (3) the time-domain waveform of sawing force is simulated by MATLAB, and the angle between teeth of the saw blade with unequal pitch is optimized. Based on the theory of energy distribution of spectrum line, the type of angle between teeth is analyzed. The effect of number of teeth on noise reduction of saw blade with unequal pitch is studied. (4) the vibration and noise of the saw blade with unequal pitch are simulated by the finite element method and the boundary element method, and the effect of the angle between teeth and the number of teeth on the noise reduction of the saw blade is verified.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TB535

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