基于正负刚度并联的立式水泵隔振技术的研究
发布时间：2019-06-19 13:26
【摘要】：作为提升水压的重要装备，水泵的使用越来越广泛，而水泵工作时带来的振动和噪声对人们的居住环境的影响不可忽视。为了改善高层楼房的居住环境，本文设计了一款具有较低固有频率的隔振器，可以有效地降低水泵工作时传递到基座的力，降低了在楼层间传递的振动，且提供了更宽的隔振频带。 本文从负刚度隔振器结构出发，分析了负刚度隔振器的基本原理，结合新型的负刚度隔振概念设计了负刚度机构模型，求取了负刚度模型的力学特性，在并联正刚度支撑元件后，通过研究正负刚度并联系统竖直和水平方向的力学特性，得到了参数对系统刚度的影响。 对正负刚度并联隔振器建立了数学模型，采用谐波平衡法和线性分析法分析了系统在受谐波激励作用下的动力特性，求取了水泵经过隔振系统后水平和竖直方向振幅的计算公式，比较了两种方法的精度，得出了线性分析法在分析小位移时可以满足精度要求。并通过分析系统结构参数对力传递率的影响，，得到了各参数的优化值，达到了最佳隔振效果。 通过实验对水泵未隔振时在正常工作状态下的加速度信号进行了测量，对其进行快速傅里叶变换得到水泵工作时加速度的频谱图，选取频谱图中能量较大的力输入模型，求得水泵隔振后的振幅和传递到基座上的力幅。获得了所设计正负刚度并联系统的隔振效果。设计了隔振器的各零件尺寸及装配模型，并分析了其可靠性。通过ADAMS对所设计得隔振器进行仿真，验证了理论结果，系统可以有效地隔离水泵传递到基座的振动，从而达到隔振降噪的目的。
[Abstract]:As an important equipment to improve water pressure, pump is used more and more widely, and the influence of vibration and noise brought by pump on people's living environment can not be ignored. In order to improve the living environment of high-rise buildings, a vibration isolator with low natural frequency is designed in this paper, which can effectively reduce the force transferred to the pedestal when the pump works, reduce the vibration transmitted between floors, and provide a wider vibration isolation frequency band. In this paper, based on the structure of negative stiffness isolator, the basic principle of negative stiffness isolator is analyzed, the negative stiffness mechanism model is designed according to the new concept of negative stiffness isolation, and the mechanical properties of negative stiffness model are obtained. After parallel positive stiffness support elements, the influence of parameters on the stiffness of the system is obtained by studying the vertical and horizontal mechanical characteristics of positive and negative stiffness parallel system. The mathematical model of the parallel isolator with positive and negative stiffness is established. The dynamic characteristics of the system under harmonic excitation are analyzed by using harmonic balance method and linear analysis method. The formulas for calculating the horizontal and vertical amplitude of the pump after passing through the vibration isolation system are obtained. The accuracy of the two methods is compared, and it is concluded that the linear analysis method can meet the accuracy requirements in the analysis of small displacement. By analyzing the influence of the structural parameters of the system on the force transfer rate, the optimal values of each parameter are obtained, and the optimal vibration isolation effect is achieved. The acceleration signal of the pump without vibration isolation is measured by experiments, and the spectrum diagram of the acceleration of the pump is obtained by fast Fourier transform. The force input model with large energy in the spectrum diagram is selected to obtain the amplitude of the pump after vibration isolation and the force amplitude transferred to the pedestal. The vibration isolation effect of the designed parallel system with positive and negative stiffness is obtained. The dimensions and assembly models of each part of the isolator are designed, and its reliability is analyzed. The designed isolator is simulated by ADAMS, and the theoretical results are verified. The system can effectively isolate the vibration of the pump transmitted to the pedestal, so as to achieve the purpose of vibration isolation and noise reduction.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.35;TB535.1
[Abstract]:As an important equipment to improve water pressure, pump is used more and more widely, and the influence of vibration and noise brought by pump on people's living environment can not be ignored. In order to improve the living environment of high-rise buildings, a vibration isolator with low natural frequency is designed in this paper, which can effectively reduce the force transferred to the pedestal when the pump works, reduce the vibration transmitted between floors, and provide a wider vibration isolation frequency band. In this paper, based on the structure of negative stiffness isolator, the basic principle of negative stiffness isolator is analyzed, the negative stiffness mechanism model is designed according to the new concept of negative stiffness isolation, and the mechanical properties of negative stiffness model are obtained. After parallel positive stiffness support elements, the influence of parameters on the stiffness of the system is obtained by studying the vertical and horizontal mechanical characteristics of positive and negative stiffness parallel system. The mathematical model of the parallel isolator with positive and negative stiffness is established. The dynamic characteristics of the system under harmonic excitation are analyzed by using harmonic balance method and linear analysis method. The formulas for calculating the horizontal and vertical amplitude of the pump after passing through the vibration isolation system are obtained. The accuracy of the two methods is compared, and it is concluded that the linear analysis method can meet the accuracy requirements in the analysis of small displacement. By analyzing the influence of the structural parameters of the system on the force transfer rate, the optimal values of each parameter are obtained, and the optimal vibration isolation effect is achieved. The acceleration signal of the pump without vibration isolation is measured by experiments, and the spectrum diagram of the acceleration of the pump is obtained by fast Fourier transform. The force input model with large energy in the spectrum diagram is selected to obtain the amplitude of the pump after vibration isolation and the force amplitude transferred to the pedestal. The vibration isolation effect of the designed parallel system with positive and negative stiffness is obtained. The dimensions and assembly models of each part of the isolator are designed, and its reliability is analyzed. The designed isolator is simulated by ADAMS, and the theoretical results are verified. The system can effectively isolate the vibration of the pump transmitted to the pedestal, so as to achieve the purpose of vibration isolation and noise reduction.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.35;TB535.1
【参考文献】
相关期刊论文 前10条
1 袁海英;陈光
本文编号：2502376
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