本文選題：動(dòng)力機(jī)器 + 層狀地基��； 參考：《廣西科技大學(xué)》2015年碩士論文

【摘要】：隨著工業(yè)技術(shù)及我國(guó)社會(huì)經(jīng)濟(jì)迅速發(fā)展,像一些如超高壓壓縮機(jī)、高轉(zhuǎn)速汽輪機(jī)等等這樣的大型動(dòng)力機(jī)器的應(yīng)用越來(lái)越普遍。這種大規(guī)模的動(dòng)力機(jī)器需要一個(gè)穩(wěn)定的基礎(chǔ)支持,所以動(dòng)力機(jī)器基礎(chǔ)的設(shè)計(jì)已經(jīng)成為整個(gè)工廠設(shè)計(jì)的重要部分。其設(shè)計(jì)標(biāo)準(zhǔn)要求許多方面都滿足要求(如環(huán)保和工業(yè)布置等),因此要嚴(yán)格限制基礎(chǔ)振動(dòng)的頻率。動(dòng)力機(jī)器在運(yùn)轉(zhuǎn)時(shí),會(huì)產(chǎn)生較大的振動(dòng),過(guò)大的振動(dòng)會(huì)影響到一些儀器、設(shè)備的正常運(yùn)行,還會(huì)影響到周?chē)h(huán)境,所以,機(jī)器基礎(chǔ)的設(shè)計(jì)要合理,必須使在正常工作中可能出現(xiàn)的振動(dòng)位移限制在允許范圍之內(nèi)。本文參照國(guó)內(nèi)外有關(guān)文獻(xiàn)以及在前人研究成果的基礎(chǔ)上進(jìn)行了如下研究:首先對(duì)動(dòng)力機(jī)器基礎(chǔ)豎向振動(dòng)進(jìn)行研究,根據(jù)彈性半空間理論建立波動(dòng)方程,然后依據(jù)積分變換(Hankel變換和反變換),并結(jié)合邊界條件導(dǎo)出了半空間表面上基礎(chǔ)豎向振動(dòng)的運(yùn)動(dòng)方程;其次,基于彈性動(dòng)力學(xué)基本理論,采用Fourier變換理論,推導(dǎo)了兩節(jié)點(diǎn)譜單元和單節(jié)點(diǎn)譜單元;然后考慮層間完全連續(xù),建立了n層土體結(jié)構(gòu)的整體剛度矩陣,研究了動(dòng)力荷載作用下層狀土體的動(dòng)力響應(yīng)問(wèn)題。最后進(jìn)行機(jī)器基礎(chǔ)和地基協(xié)同工作的動(dòng)力分析:①分析了天然地基動(dòng)力參數(shù),利用彈性半空間計(jì)算模式實(shí)用化法進(jìn)行天然地基動(dòng)力參數(shù)計(jì)算,將其結(jié)果與規(guī)范規(guī)定得出的結(jié)果進(jìn)行了比較;②建立有限元模型,研究動(dòng)力機(jī)器基礎(chǔ)與地基協(xié)同工作的動(dòng)力分析。通過(guò)以上研究,本文得到了機(jī)器基礎(chǔ)豎向振動(dòng)的運(yùn)動(dòng)方程;推導(dǎo)出了單節(jié)點(diǎn)譜單元和雙節(jié)點(diǎn)譜單元,得出基礎(chǔ)底面各點(diǎn)豎向位移由于底層模量、層厚及荷載頻率的不同而受到的影響規(guī)律;根據(jù)機(jī)器基礎(chǔ)和地基相互作用的分析,得出在機(jī)器基礎(chǔ)設(shè)計(jì)時(shí)考慮地基基礎(chǔ)相互作用的重要性;根據(jù)機(jī)器基礎(chǔ)的動(dòng)力分析,得出最大振動(dòng)線位移發(fā)生的規(guī)律特征,可推測(cè)出動(dòng)力機(jī)器在正常工作中有可能出現(xiàn)的共振區(qū)域,盡可能的使外部激勵(lì)遠(yuǎn)離這部分共振區(qū)域,避免使其出現(xiàn)共振。
[Abstract]:With the rapid development of industrial technology and China's social economy, the application of some large power machines such as ultra-high pressure compressors, high speed steam turbines and so on is becoming more and more common. This kind of large-scale power machine needs a stable foundation support, so the design of power machine foundation has become an important part of the whole plant design. The design standard requires many aspects to meet the requirements (such as environmental protection and industrial layout, etc.), so the frequency of foundation vibration should be strictly limited. When the power machine is in operation, it will produce larger vibration, too much vibration will affect the normal operation of some instruments, equipment, and the surrounding environment. Therefore, the design of the machine foundation should be reasonable. Vibration displacements that may occur during normal operation must be limited to the allowable range. In this paper, the following studies are carried out on the basis of domestic and foreign literatures and previous research results: firstly, the vertical vibration of the power machine foundation is studied, and the wave equation is established according to the elastic half-space theory. Then, according to the integral transformation and inverse transformation, and combining with boundary conditions, the motion equations of vertical vibration of foundation on the surface of half-space are derived. Secondly, based on the basic theory of elastic dynamics, the theory of Fourier transformation is adopted. Two point spectral elements and one point spectral element are derived, and then the global stiffness matrix of n-story soil structure is established considering the complete continuity between layers, and the dynamic response of layered soil under dynamic load is studied. Finally, the dynamic analysis of the machine foundation and the foundation is carried out. The dynamic parameters of the natural foundation are analyzed by 1: 1, and the dynamic parameters of the natural foundation are calculated by the practical method of elastic half-space calculation. The finite element model is established to study the dynamic analysis of dynamic machine foundation and foundation. Through the above research, the motion equation of vertical vibration of machine foundation is obtained, and the single node spectral element and the double node point spectrum element are derived, and the vertical displacement of each point on the bottom surface of the foundation is obtained due to the underlying modulus. According to the analysis of the interaction between the machine foundation and the foundation, the importance of considering the interaction between the foundation and the foundation in the design of the machine foundation, the dynamic analysis of the machine foundation, The characteristics of the maximum vibration line displacement are obtained, and the resonance region which may occur in the normal operation of the power machine can be inferred, and the external excitation is far away from this part of the resonance region as far as possible, and the resonance can be avoided.
【學(xué)位授予單位】：廣西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU476.1

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