阻尼对水泵振动及声辐射效果影响分析

发布时间：2018-02-23 21:31

本文关键词： 减振降噪功率流颗粒阻尼水泵振动　出处：《沈阳工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：各类商用和民用建筑的增多，设备功率的增大都使水泵在运行过程中的功率要求越来越高，，伴随着的振动和噪音越来越大，减振降噪迫在眉睫。本文以某水泵实验台为研究对象，用四端参数法建立水泵实验台隔振系统模型，通过功率流法和诺顿等效定理结合求出有阻尼和无阻尼情况下系统的功率流。从颗粒阻尼和粘弹性阻尼材料入手，分别分析两种阻尼的影响因素，找出最佳减振降噪方案，再将两种阻尼的最佳方案进行对比找出效果好的方案，再进一步结合两种方案进行优化。用离散单元法分析颗粒阻尼的特性，对水泵做颗粒阻尼减振降噪实验，分析不同颗粒大小、填充率、分布形式、质量比和铺设方式情况下的减振结果。实验结果证明：颗粒大小越小减振越好；分隔格数越多减振降噪效果越好，随着填充率的增加速度振幅先减小后增大；对于水泵振动系统四角铺设方式减振降噪效果要好于平均铺设。为了验证实验的准确性以填充率为例，用分数导数理论建立单激励不同填充率情况下，水泵系统的自由衰减仿真图形，通过仿真验证了颗粒阻尼的减振降噪效果随着填充率的增加速度振幅呈现先减小后增大的趋势，与实验结果吻合。分析粘弹性阻尼材料的影响因素，得出自由阻尼和约束阻尼的损耗因子相关计算公式，同时在弹簧隔振器下方垫粘弹性阻尼材料实验证明其减振效果。建立水泵电机系统的三维模型，通过模态分析，找出在运行过程中水泵系统出现振动最大的位置，并在该位置敷设阻尼材料达到减振的目的。最终提出最有效的解决方案。
[Abstract]:With the increase of all kinds of commercial and civil buildings and the increase of equipment power, the power requirement of water pump in the operation process is higher and higher, accompanied by more and more vibration and noise. It is urgent to reduce vibration and noise. In this paper, the vibration isolation system model of a pump experimental platform is established by using four-terminal parameter method. By combining the power flow method with the Norton equivalent theorem, the power flow of the system with and without damping is obtained. Starting with the particle damping and viscoelastic damping materials, the influence factors of the two damping factors are analyzed, and the optimal vibration and noise reduction schemes are found out. Then the two optimal damping schemes are compared to find out the better schemes, and the two schemes are further optimized. The characteristics of particle damping are analyzed by the discrete element method, and the experiment of reducing vibration and noise by particle damping is done on the water pump. The results of vibration reduction with different particle size, filling ratio, distribution form, mass ratio and laying mode are analyzed. The experimental results show that the smaller the particle size, the better the vibration reduction and noise reduction. With the increase of filling rate, the amplitude of velocity first decreases and then increases. The effect of vibration and noise reduction for the four-angle laying of pump vibration system is better than that of average laying. In order to verify the accuracy of the experiment, the filling rate is taken as an example. Based on the fractional derivative theory, the free attenuation simulation figure of water pump system with single excitation and different filling ratio is established. The simulation results show that the damping effect of particle damping decreases first and then increases with the increase of filling rate. The influence factors of viscoelastic damping materials are analyzed, and the formulas for calculating the loss factors of free damping and constrained damping are obtained. At the same time, the viscoelastic damping material under the spring vibration isolator proves its damping effect. The three-dimensional model of the pump motor system is established, and through modal analysis, the maximum vibration position of the pump system is found out. Finally, the most effective solution is put forward.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535

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