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  本文關(guān)鍵詞：轉(zhuǎn)向機(jī)構(gòu)的時(shí)變可靠性分析與綜合　出處：《西華大學(xué)》2012年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 轉(zhuǎn)向機(jī)構(gòu) 不確定性 時(shí)變可靠性 優(yōu)化綜合

【摘要】：在不確定性下研究機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性問(wèn)題是近年來(lái)機(jī)構(gòu)學(xué)研究的熱點(diǎn)課題之一。由于機(jī)構(gòu)受幾何尺寸、運(yùn)動(dòng)副間隙、工作原理及使用環(huán)境的影響，其運(yùn)動(dòng)輸出往往具有不確定性，從而可能引起機(jī)構(gòu)運(yùn)動(dòng)精度可靠度下降、機(jī)構(gòu)動(dòng)作不可靠等問(wèn)題。就機(jī)構(gòu)運(yùn)動(dòng)精度可靠性而言，目前大多方法屬于點(diǎn)可靠度分析方法，點(diǎn)可靠度只是提供了某一瞬時(shí)時(shí)間點(diǎn)上機(jī)構(gòu)運(yùn)動(dòng)輸出滿(mǎn)足期望運(yùn)動(dòng)輸出或?qū)崿F(xiàn)預(yù)定功能的可能性。顯然，從整個(gè)運(yùn)動(dòng)區(qū)間來(lái)考察機(jī)構(gòu)的可靠性往往比點(diǎn)可靠性更加合理、更加符合實(shí)際。因此，，在不確定性條件下研究機(jī)構(gòu)的時(shí)變（區(qū)間）運(yùn)動(dòng)可靠性及其優(yōu)化設(shè)計(jì)（綜合）問(wèn)題，具有極為重要的理論意義和實(shí)際價(jià)值。本文以整體式轉(zhuǎn)向機(jī)構(gòu)和齒輪齒條式轉(zhuǎn)向機(jī)構(gòu)為研究對(duì)象，在分析轉(zhuǎn)向機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性和優(yōu)化綜合的同時(shí)，對(duì)時(shí)變運(yùn)動(dòng)可靠性方法進(jìn)行了詳細(xì)的論述。 本文主要研究工作可以概括如下： 1在對(duì)目前汽車(chē)中廣泛使用的整體式轉(zhuǎn)向機(jī)構(gòu)和齒輪齒條式轉(zhuǎn)向機(jī)構(gòu)進(jìn)行運(yùn)動(dòng)分析的基礎(chǔ)上，綜合考慮構(gòu)件尺寸的不確定性（隨機(jī)性）和機(jī)構(gòu)自身結(jié)構(gòu)誤差，建立了轉(zhuǎn)向機(jī)構(gòu)誤差概率模型。 2引入結(jié)構(gòu)可靠性分析方法中上穿越率和下穿越率概念，并結(jié)合一次二階矩法（FOSM）和首次穿越的Poisson近似方法推導(dǎo)出機(jī)構(gòu)時(shí)變（區(qū)間）運(yùn)動(dòng)可靠度解析表達(dá)式。以此為基礎(chǔ)建立了整體式轉(zhuǎn)向機(jī)構(gòu)和齒輪齒條式轉(zhuǎn)向機(jī)構(gòu)的時(shí)變運(yùn)動(dòng)可靠性模型。并通過(guò)相關(guān)算例將其與點(diǎn)可靠性進(jìn)行比較分析，結(jié)果表明機(jī)構(gòu)時(shí)變可靠度總是小于等于點(diǎn)可靠度，滿(mǎn)足點(diǎn)可靠度并不意味著滿(mǎn)足時(shí)變可靠度。顯然，機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性比傳統(tǒng)的點(diǎn)可靠性更加合理，它以整個(gè)運(yùn)動(dòng)區(qū)間為考察對(duì)象，能夠體現(xiàn)機(jī)構(gòu)在整個(gè)運(yùn)動(dòng)過(guò)程中滿(mǎn)足預(yù)期功能的可能性。 3針對(duì)機(jī)構(gòu)優(yōu)化設(shè)計(jì)（綜合）問(wèn)題，提出了機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性?xún)?yōu)化綜合方法。建立了整體式轉(zhuǎn)向機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性?xún)?yōu)化模型，通過(guò)數(shù)值實(shí)例將其與該機(jī)構(gòu)的確定性?xún)?yōu)化方法及點(diǎn)可靠性?xún)?yōu)化方法進(jìn)行比較分析。結(jié)果表明，機(jī)構(gòu)時(shí)變運(yùn)動(dòng)可靠性?xún)?yōu)化方法比確定性?xún)?yōu)化方法和點(diǎn)可靠性?xún)?yōu)化方法更加優(yōu)越，不僅可以在滿(mǎn)足可靠性要求的同時(shí)減小機(jī)構(gòu)的結(jié)構(gòu)誤差，而且其求得的優(yōu)化解往往也比其余兩種優(yōu)化方法穩(wěn)定。
[Abstract]:Research institutions under uncertainty time-varying reliability problem is one of the hot topic in research institutions in recent years. Because the institutions by the geometrical dimensions, clearances, affect the working principle and use of the environment, the output motion is uncertain, which may cause the motion precision reliability reduction, agency action is not reliable. The motion precision and reliability, most of the current methods belong to reliability analysis method, the reliability of only provides an instantaneous time mechanism motion output satisfies the desired output motion or the possibility of realizing a predetermined function. Obviously, the reliability from the entire movement range to examine the mechanism more often than reliability is more reasonable, more in line with the actual research institutions. Therefore, in conditions of uncertainty and time-varying (interval) motion reliability and optimization design (integrated), has a very For the important theoretical significance and practical value, this paper takes the integral steering mechanism and the rack and pinion steering mechanism as the research object. After analyzing the reliability and optimization synthesis of the steering mechanism's time-varying motion, the time variant motion reliability method is discussed in detail.
The main research work in this paper can be summarized as follows:
1, based on the motion analysis of the integral steering mechanism and rack and pinion steering mechanism widely used in automobiles, the error probability model of steering mechanism is established considering the uncertainty of components size and randomness of mechanism.
2 introduction of structural reliability analysis method on the crossing rate and the crossing rate concept, combined with a two order moment method (FOSM) and for the first time through the Poisson approximation method to derive time-varying (interval) mechanism motion reliability analytical expressions. Based on the established integral steering mechanism and a gear rack type steering mechanism the time-varying dynamic reliability model. And through examples and the reliability were analyzed, results show that the mechanism of time-varying reliability is always less than point reliability, meet point reliability does not mean that meet the time-varying reliability. Obviously, time-varying mechanism motion reliability is more reasonable than the traditional reliability, it in the whole range of motion as the object of study, can reflect the possibility of institutions to meet the intended function of the sport in the whole process.
3 for the optimal design of mechanism (integrated), this paper puts forward the mechanism of time-varying reliability optimization method. The comprehensive integral steering mechanism of time-varying reliability optimization model is established through numerical examples, it with that of the deterministic optimization method and reliability optimization method were compared and analyzed. The results show that the mechanism of time-varying reliability the optimization method is better than the deterministic optimization method and reliability optimization method is more superior, can not only meet the reliability requirements and structure error reduction mechanism, and its optimal solution is more than the other two kinds of optimization methods.

【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH112

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