本文選題：機(jī)械振動(dòng)臺(tái)　切入點(diǎn)：包絡(luò)理論　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：振動(dòng)臺(tái)是一種用于檢驗(yàn)各類工業(yè)產(chǎn)品和工程建筑力學(xué)性能的標(biāo)準(zhǔn)試驗(yàn)設(shè)備。本文在分析國(guó)內(nèi)外現(xiàn)有各類振動(dòng)臺(tái)特性及其發(fā)展現(xiàn)狀的基礎(chǔ)上，通過(guò)采用新型激振方式和特殊的結(jié)構(gòu)，設(shè)計(jì)了一種負(fù)載能力大，上限頻率高，，加速度波形失真度小的新型軸向推力式機(jī)械振動(dòng)臺(tái)，并進(jìn)行深入理論研究以及計(jì)算機(jī)仿真分析，為振動(dòng)行業(yè)的發(fā)展提供新方法、新技術(shù)和新設(shè)備。 本文首先根據(jù)軸向推力式機(jī)械振動(dòng)臺(tái)的激振原理，應(yīng)用包絡(luò)面理論導(dǎo)出了激振臺(tái)工作曲面方程，使其輸出曲線符合余弦加速度運(yùn)動(dòng)規(guī)律。并據(jù)此研究了激振臺(tái)工作曲面與滾子的接觸線形態(tài)特點(diǎn)，同時(shí)導(dǎo)出了曲面的曲率半徑和機(jī)構(gòu)壓力角公式，為振動(dòng)臺(tái)的詳細(xì)設(shè)計(jì)以及力學(xué)分析奠定基礎(chǔ)。 其次，從剛體動(dòng)力學(xué)及彈性動(dòng)力學(xué)兩方面對(duì)該振動(dòng)臺(tái)進(jìn)行了分析。通過(guò)建立系統(tǒng)的動(dòng)力學(xué)微分方程，分別討論了其力矩輸出特性和臺(tái)面穩(wěn)定運(yùn)行的臨界條件，并進(jìn)行了仿真驗(yàn)證。同時(shí)分析了該振動(dòng)臺(tái)產(chǎn)生的位移、速度和加速度諧波誤差的原因，并根據(jù)激振臺(tái)殘余振動(dòng)的函數(shù)曲線，得出了主軸轉(zhuǎn)速限制條件。利用赫茲理論校核了接觸部件的強(qiáng)度；分析了滾子和激振臺(tái)工作曲面之間的相對(duì)滑動(dòng)及運(yùn)行中的功率損耗。 最后，在建立該振動(dòng)臺(tái)的虛擬樣機(jī)模型的基礎(chǔ)上，驗(yàn)證和分析了輸出波形的特點(diǎn)。從隨機(jī)波誤差和諧波誤差兩方面分析了其加速度的波形，并用DFT頻譜分析方法編程計(jì)算其失真度大小。同時(shí)基于UG/Motion和Matlab/Simulink聯(lián)合仿真技術(shù)，建立了振動(dòng)臺(tái)的動(dòng)力學(xué)模型和控制系統(tǒng)，并進(jìn)行了聯(lián)合仿真分析，驗(yàn)證了該控制系統(tǒng)的有效性和合理性，為該新型振動(dòng)臺(tái)的優(yōu)化研究奠定了基礎(chǔ)。
[Abstract]:Vibration table is a kind of standard test equipment used to test the mechanical properties of various industrial products and engineering buildings. This paper analyzes the characteristics and development status of all kinds of shaking table at home and abroad. A new type of axial thrust mechanical vibration table with high load capacity, high upper limit frequency and low distortion of acceleration waveform is designed by adopting a new type of exciting mode and special structure, and further theoretical research and computer simulation analysis are carried out. To provide new methods, new technology and new equipment for the development of vibration industry. In this paper, first of all, according to the exciting principle of the axial thrust mechanical vibration table, the equation of the working surface of the exciting table is derived by using the envelope theory. The output curve accords with the law of cosine acceleration. Based on this, the shape characteristics of contact line between the working surface of the exciting table and the roller are studied, and the curvature radius of the surface and the pressure angle formula of the mechanism are derived. It lays a foundation for the detailed design and mechanical analysis of vibration table. Secondly, the vibration table is analyzed from two aspects: rigid body dynamics and elastic dynamics. By establishing the dynamic differential equation of the system, the torque output characteristics and the critical conditions for the stable operation of the table are discussed respectively. At the same time, the causes of the harmonic errors of displacement, velocity and acceleration are analyzed, and according to the function curve of the residual vibration of the vibration table, The limiting conditions of spindle speed are obtained. The strength of contact parts is checked by using Hertz theory. The relative sliding between roller and exciting table and the power loss in operation are analyzed. Finally, on the basis of establishing the virtual prototype model of the shaking table, the characteristics of the output waveform are verified and analyzed. The acceleration waveform is analyzed from the random wave error and harmonic error. The DFT spectrum analysis method is used to program and calculate the distortion degree. Based on the joint simulation technology of UG/Motion and Matlab/Simulink, the dynamic model and control system of the shaking table are established, and the joint simulation analysis is carried out. The validity and rationality of the control system are verified, which lays a foundation for the optimization research of the new vibration table.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB534.2

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