【摘要】：作為提升水壓的重要裝備，水泵的使用越來越廣泛，而水泵工作時帶來的振動和噪聲對人們的居住環(huán)境的影響不可忽視。為了改善高層樓房的居住環(huán)境，本文設(shè)計了一款具有較低固有頻率的隔振器，可以有效地降低水泵工作時傳遞到基座的力，降低了在樓層間傳遞的振動，且提供了更寬的隔振頻帶。 本文從負(fù)剛度隔振器結(jié)構(gòu)出發(fā)，分析了負(fù)剛度隔振器的基本原理，結(jié)合新型的負(fù)剛度隔振概念設(shè)計了負(fù)剛度機構(gòu)模型，求取了負(fù)剛度模型的力學(xué)特性，在并聯(lián)正剛度支撐元件后，通過研究正負(fù)剛度并聯(lián)系統(tǒng)豎直和水平方向的力學(xué)特性，得到了參數(shù)對系統(tǒng)剛度的影響。 對正負(fù)剛度并聯(lián)隔振器建立了數(shù)學(xué)模型，采用諧波平衡法和線性分析法分析了系統(tǒng)在受諧波激勵作用下的動力特性，求取了水泵經(jīng)過隔振系統(tǒng)后水平和豎直方向振幅的計算公式，比較了兩種方法的精度，得出了線性分析法在分析小位移時可以滿足精度要求。并通過分析系統(tǒng)結(jié)構(gòu)參數(shù)對力傳遞率的影響，，得到了各參數(shù)的優(yōu)化值，達(dá)到了最佳隔振效果。 通過實驗對水泵未隔振時在正常工作狀態(tài)下的加速度信號進行了測量，對其進行快速傅里葉變換得到水泵工作時加速度的頻譜圖，選取頻譜圖中能量較大的力輸入模型，求得水泵隔振后的振幅和傳遞到基座上的力幅。獲得了所設(shè)計正負(fù)剛度并聯(lián)系統(tǒng)的隔振效果。設(shè)計了隔振器的各零件尺寸及裝配模型，并分析了其可靠性。通過ADAMS對所設(shè)計得隔振器進行仿真，驗證了理論結(jié)果，系統(tǒng)可以有效地隔離水泵傳遞到基座的振動，從而達(dá)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.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU991.35;TB535.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 袁海英;陳光

本文編號：2502376