流体管路系统减振降噪研究
发布时间：2019-06-28 11:41
【摘要】：当今，噪声污染被列为世界污染三大重点问题之一，噪声充斥在人类整个行为活动中，人们对其重视程度已不亚于水污染、大气污染等环境污染。在诸如军工、医疗、科研等高精尖领域，噪声污染已成为阻碍人类进步的关键问题，成为国内外同行业界着手重点解决的重点问题和难点问题之一。人类物质生活水平的提高的同时，对生活环境的要求也越来越高，噪声污染已成为影响人类生活环境的主要问题。流体管路振动噪声问题影响到人类正常生活和生产安全，其噪声根源在于动力源泵站，论文通过理论和实验研究，对泵站出口加装水管路消声器降低充液管路系统振动噪声污染，具有重要的理论和实际工程应用意义。 论文中以一种新型水下阻尼吸声复合材料天然橡胶基硅藻土作为研究对象，并将其制成水管路消声器应用于高层供水管路系统减振降噪项目中，对流体管路系统减振降噪问题展开研究。对新型水下吸声复合材料进行了力学性能测试和微观形貌表征。分析管路振动噪声产生机理，弯管数学模型分析表明管路噪声主要原因是由于水流压力脉动和汽蚀白噪声。对新型复合材料离散化，建立多自由度运动方程结合流体域数学模型分析了水管路消声器对流体压力脉动的吸收效果。根据硅藻土微孔空气动力学数学模型，分析其微孔尺寸结构与吸能系数关系。建立水管路消声器三维模型，应用Ansys软件对水管路消声器进行双向流固耦合仿真，，并与多自由度数学建模Simulink软件仿真结果进行了对比分析。加工实体水管路消声器模型，应用汽车尾气为噪声源进行模拟消声实验，并应用Matlab软件进行1/3倍程频谱分析。 通过实验和理论分析研究结论为：硅藻土含量最优值为30%；Ansys与Simulink仿真结果对比得出水管路消声器对压力脉动具有显著的吸收效果；天然橡胶为声学惰性材料，其良好的阻尼性能可是噪声传播的能量得到较大的衰减；模拟噪声实验和理论分析表明硅藻土对高频噪声吸声效果显著。
[Abstract]:Nowadays, noise pollution is listed as one of the three key problems of pollution in the world. Noise is flooded in the whole behavior of human beings, and people pay no less attention to it than water pollution, air pollution and other environmental pollution. In advanced fields such as military industry, medical treatment, scientific research and so on, noise pollution has become the key problem that hinders the progress of human beings, and has become one of the key and difficult problems to be solved by the industry at home and abroad. With the improvement of human material living standard, the requirements for living environment are getting higher and higher, and noise pollution has become the main problem affecting human living environment. The vibration and noise of fluid pipeline affects the normal life and production safety of human beings. The source of noise lies in the power source pumping station. Through theoretical and experimental research, this paper has important theoretical and practical engineering significance for adding water pipe muffler at the outlet of pumping station to reduce the vibration and noise pollution of liquid-filled pipeline system. In this paper, a new type of underwater damping and sound absorption composite natural rubber based diatomite is taken as the research object, and the water pipe muffler is applied to the vibration and noise reduction project of the high-rise water supply pipeline system, and the vibration and noise reduction of the fluid pipeline system is studied. The mechanical properties and microstructure of the new underwater sound absorption composites were tested and characterized. The mechanism of pipeline vibration and noise is analyzed. The mathematical model analysis of pipe bend shows that the main reason of pipeline noise is flow pressure pulsation and cavitation white noise. For the discretization of new composite materials, the multi-degree-of-freedom equation of motion and the mathematical model of fluid domain are established to analyze the absorption effect of water pipe muffler on fluid pressure fluctuation. According to the mathematical model of micropore aerodynamics of diatomite, the relationship between micropore size structure and energy absorption coefficient is analyzed. The three-dimensional model of water pipe muffler is established, and the bidirectional fluid-solid coupling simulation of water pipe muffler is carried out by using Ansys software, and the simulation results are compared with those of multi-degree-of-freedom mathematical modeling Simulink software. The muffler model of solid water pipe is processed, and the simulated noise suppression experiment is carried out by using automobile exhaust as noise source, and the spectrum analysis of 1 / 3 times is carried out by using Matlab software. The results of experimental and theoretical analysis show that the optimal diatomite content is 30% Ansys and Simulink simulation results show that the water pipe muffler has a significant absorption effect on pressure pulsation, the good damping performance of natural rubber is acoustic inertia material, but the energy of noise propagation is greatly attenuated, and the simulated noise experiment and theoretical analysis show that diatomite has remarkable effect on high frequency noise absorption.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535
本文编号：2507274
[Abstract]:Nowadays, noise pollution is listed as one of the three key problems of pollution in the world. Noise is flooded in the whole behavior of human beings, and people pay no less attention to it than water pollution, air pollution and other environmental pollution. In advanced fields such as military industry, medical treatment, scientific research and so on, noise pollution has become the key problem that hinders the progress of human beings, and has become one of the key and difficult problems to be solved by the industry at home and abroad. With the improvement of human material living standard, the requirements for living environment are getting higher and higher, and noise pollution has become the main problem affecting human living environment. The vibration and noise of fluid pipeline affects the normal life and production safety of human beings. The source of noise lies in the power source pumping station. Through theoretical and experimental research, this paper has important theoretical and practical engineering significance for adding water pipe muffler at the outlet of pumping station to reduce the vibration and noise pollution of liquid-filled pipeline system. In this paper, a new type of underwater damping and sound absorption composite natural rubber based diatomite is taken as the research object, and the water pipe muffler is applied to the vibration and noise reduction project of the high-rise water supply pipeline system, and the vibration and noise reduction of the fluid pipeline system is studied. The mechanical properties and microstructure of the new underwater sound absorption composites were tested and characterized. The mechanism of pipeline vibration and noise is analyzed. The mathematical model analysis of pipe bend shows that the main reason of pipeline noise is flow pressure pulsation and cavitation white noise. For the discretization of new composite materials, the multi-degree-of-freedom equation of motion and the mathematical model of fluid domain are established to analyze the absorption effect of water pipe muffler on fluid pressure fluctuation. According to the mathematical model of micropore aerodynamics of diatomite, the relationship between micropore size structure and energy absorption coefficient is analyzed. The three-dimensional model of water pipe muffler is established, and the bidirectional fluid-solid coupling simulation of water pipe muffler is carried out by using Ansys software, and the simulation results are compared with those of multi-degree-of-freedom mathematical modeling Simulink software. The muffler model of solid water pipe is processed, and the simulated noise suppression experiment is carried out by using automobile exhaust as noise source, and the spectrum analysis of 1 / 3 times is carried out by using Matlab software. The results of experimental and theoretical analysis show that the optimal diatomite content is 30% Ansys and Simulink simulation results show that the water pipe muffler has a significant absorption effect on pressure pulsation, the good damping performance of natural rubber is acoustic inertia material, but the energy of noise propagation is greatly attenuated, and the simulated noise experiment and theoretical analysis show that diatomite has remarkable effect on high frequency noise absorption.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535
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