本文選題：隨機(jī)支撐剛度　切入點(diǎn)：電磁支撐　出處：《河南工業(yè)大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：支撐剛度參數(shù)是轉(zhuǎn)子系統(tǒng)的重要?jiǎng)恿W(xué)參數(shù)，對(duì)系統(tǒng)的動(dòng)力學(xué)性能具有重要的影響。在實(shí)際的工程中，由于制造、安裝、運(yùn)行、維護(hù)等多種因素的影響，轉(zhuǎn)子系統(tǒng)的剛度模型往往具有隨機(jī)性，用隨機(jī)參數(shù)模型來(lái)描述更能反映實(shí)際情況。研究隨機(jī)支撐剛度參數(shù)對(duì)轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)性能影響的理論成果很多，但由于實(shí)驗(yàn)研究隨機(jī)支撐剛度動(dòng)力學(xué)問(wèn)題需要加工大量的試件，這在研究時(shí)間和成本上都是不允許的，因此相關(guān)的研究很少。本文設(shè)計(jì)、加工了一種低成本的隨機(jī)支撐剛度參數(shù)模擬試驗(yàn)平臺(tái)，實(shí)驗(yàn)研究了隨機(jī)支撐剛度參數(shù)對(duì)轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)性能的影響。主要研究?jī)?nèi)容和研究成果如下： 1.以LabVIEW為開(kāi)發(fā)平臺(tái)，設(shè)計(jì)開(kāi)發(fā)了基于虛擬儀器技術(shù)的振動(dòng)信號(hào)測(cè)試與分析系統(tǒng)，用于測(cè)量轉(zhuǎn)子系統(tǒng)的振動(dòng)信號(hào)。 2.基于電磁支撐的工作原理，以實(shí)驗(yàn)室現(xiàn)有的轉(zhuǎn)子實(shí)驗(yàn)臺(tái)為研究對(duì)象，設(shè)計(jì)、加工了電磁支撐，構(gòu)建了電磁支撐-轉(zhuǎn)子-軸承系統(tǒng)，用于在實(shí)驗(yàn)室條件下模擬轉(zhuǎn)子系統(tǒng)的隨機(jī)支撐剛度參數(shù)；以該系統(tǒng)為研究對(duì)象，分析了電磁支撐不通電時(shí)，影響系統(tǒng)動(dòng)力學(xué)性能的各種不確定參數(shù)，給出了逐步識(shí)別這些不確定參數(shù)的實(shí)驗(yàn)方法，識(shí)別出了這些不確定參數(shù)，，建立了電磁支撐-轉(zhuǎn)子-軸承系統(tǒng)的實(shí)驗(yàn)研究模型，為實(shí)驗(yàn)研究隨機(jī)支撐剛度轉(zhuǎn)子系統(tǒng)固有頻率消除了干擾因素。 3.以電磁支撐-轉(zhuǎn)子-軸承系統(tǒng)為研究對(duì)象，實(shí)測(cè)了電磁支撐通入0~200mA勵(lì)磁電流時(shí)轉(zhuǎn)子系統(tǒng)的固有頻率，識(shí)別出了電磁支撐在不同勵(lì)磁電流工況下的實(shí)際剛度參數(shù)，找出了電磁支撐的線性工作區(qū)。由于在線性工作區(qū)內(nèi)支撐剛度參數(shù)與勵(lì)磁電流呈線性關(guān)系，通過(guò)控制電磁支撐勵(lì)磁電流的隨機(jī)分布特征，可以實(shí)現(xiàn)各種支撐剛度參數(shù)的隨機(jī)模擬。 4.以電磁支撐-轉(zhuǎn)子-軸承系統(tǒng)為實(shí)驗(yàn)平臺(tái)，給出了一種模擬隨機(jī)支撐剛度參數(shù)的實(shí)驗(yàn)方法，實(shí)驗(yàn)研究了隨機(jī)支撐剛度參數(shù)符合正態(tài)分布時(shí)轉(zhuǎn)子系統(tǒng)固有頻率的均值、方差和隨機(jī)分布，通過(guò)實(shí)驗(yàn)值、攝動(dòng)值及Monte Carlo模擬結(jié)果的對(duì)比，證明了該方法可以實(shí)現(xiàn)轉(zhuǎn)子系統(tǒng)支撐剛度的隨機(jī)模擬，且實(shí)驗(yàn)結(jié)果可信，降低了實(shí)驗(yàn)成本，提高了經(jīng)濟(jì)效益。該實(shí)驗(yàn)平臺(tái)可用于后續(xù)轉(zhuǎn)子系統(tǒng)隨機(jī)動(dòng)力學(xué)響應(yīng)問(wèn)題的研究。
[Abstract]:The support stiffness parameter is an important dynamic parameter of the rotor system, which has an important influence on the dynamic performance of the rotor system. In actual engineering, it is affected by many factors, such as manufacture, installation, operation, maintenance and so on. The stiffness model of rotor system is always stochastic, and the stochastic parameter model can better reflect the actual situation. There are a lot of theoretical results to study the influence of the random support stiffness parameters on the dynamic performance of the rotor system. However, due to the large number of specimens that need to be processed to study the dynamics of random braced stiffness experimentally, this is not allowed in terms of research time and cost, so there are few related studies. A low cost simulation platform of random bracing stiffness parameters is developed, and the effect of random bracing stiffness parameters on the dynamic performance of rotor system is studied experimentally. The main contents and results are as follows:. 1. The vibration signal testing and analysis system based on virtual instrument technology is designed and developed on the platform of LabVIEW, which is used to measure the vibration signal of rotor system. 2. Based on the working principle of electromagnetic support and taking the existing laboratory rotor test bench as the research object, the electromagnetic support is designed and machined, and the electromagnetic brace-rotor bearing system is constructed. It is used to simulate the random support stiffness parameters of the rotor system under the laboratory condition, taking the system as the research object, the various uncertain parameters which affect the dynamic performance of the system are analyzed when the electromagnetic support is not electrified. The experimental method of identifying these uncertain parameters step by step is given, and the experimental research model of electromagnetic brace-rotor bearing system is established. The interference factors are eliminated for the experimental study of the natural frequency of the rotor system with random support stiffness. 3. Taking electromagnetic brace-rotor bearing system as the research object, the natural frequency of the rotor system is measured when the electromagnetic support passes through the excitation current of 0 ~ 200mA, and the actual stiffness parameters of the electromagnetic support under different excitation current conditions are identified. The linear working area of electromagnetic bracing is found. Because of the linear relationship between the support stiffness parameters and the excitation current in the linear working area, the random distribution characteristics of the electromagnetic braced excitation current are controlled. The random simulation of various support stiffness parameters can be realized. 4. Taking the electromagnetic brace-rotor bearing system as the experimental platform, an experimental method to simulate the random bracing stiffness parameters is presented. The experimental results show that the random bracing stiffness parameters accord with the mean of the natural frequency of the normal distribution time-transfer subsystem. The variance and random distribution are compared with the experimental values, perturbation values and Monte Carlo simulation results. It is proved that this method can realize the stochastic simulation of the support stiffness of the rotor system, and the experimental results are credible and the experimental cost is reduced. The experimental platform can be used to study the stochastic dynamic response of the subsequent rotor system.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH113

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