發(fā)布時(shí)間：2018-01-16 05:06

  本文關(guān)鍵詞：壓力機(jī)傳動(dòng)機(jī)構(gòu)可靠性分析與設(shè)計(jì)　出處：《西華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 機(jī)械式壓力機(jī) 多連桿機(jī)構(gòu) 可靠性分析 穩(wěn)健性設(shè)計(jì)

【摘要】：機(jī)械式壓力機(jī)是成形領(lǐng)域中應(yīng)用較為廣泛的鍛壓設(shè)備,其在性能上能夠很好的滿足鍛壓工藝的要求。而多桿機(jī)構(gòu)作為該類壓力機(jī)的主傳動(dòng)系統(tǒng),其運(yùn)動(dòng)與動(dòng)力學(xué)性能的好壞直接關(guān)系到產(chǎn)品成形質(zhì)量,因此,對(duì)壓力機(jī)傳動(dòng)機(jī)構(gòu)的設(shè)計(jì)至關(guān)重要。在壓力機(jī)傳動(dòng)機(jī)構(gòu)的設(shè)計(jì)中,傳統(tǒng)方法在確定性范圍對(duì)機(jī)構(gòu)的運(yùn)動(dòng)與動(dòng)力性能進(jìn)行討論和設(shè)計(jì)。但機(jī)構(gòu)系統(tǒng)中的不確定性是固有的,這些不確定性因素對(duì)機(jī)構(gòu)的性能具有極大的影響。為此,本文以雙動(dòng)壓力機(jī)連桿機(jī)構(gòu)為對(duì)象,開展該壓力機(jī)傳動(dòng)機(jī)構(gòu)運(yùn)動(dòng)學(xué)分析、概率建模、可靠性分析與設(shè)計(jì),其具體內(nèi)容如下:1、傳動(dòng)機(jī)構(gòu)的運(yùn)動(dòng)學(xué)分析。建立了雙動(dòng)壓力機(jī)連桿機(jī)構(gòu)的運(yùn)動(dòng)學(xué)解析方程,完成了機(jī)構(gòu)位移、速度、加速度的解析求解,為機(jī)構(gòu)的可靠性分析與穩(wěn)健性設(shè)計(jì)奠定基礎(chǔ)。2、傳動(dòng)機(jī)構(gòu)的概率建模與可靠性分析�？紤]機(jī)構(gòu)構(gòu)件尺寸公差,以機(jī)構(gòu)滑塊位移波動(dòng)量在允許波動(dòng)量范圍內(nèi)建立其極限狀態(tài)方程,進(jìn)而建立了雙動(dòng)壓力機(jī)連桿機(jī)構(gòu)的可靠性分析模型。采用泰勒級(jí)數(shù)線性化極限狀態(tài)方程,由此導(dǎo)出滑塊位移的均值和方差,進(jìn)而采用一次二階矩法獲得機(jī)構(gòu)運(yùn)動(dòng)的可靠度。3、傳動(dòng)機(jī)構(gòu)的可靠性設(shè)計(jì)。以機(jī)構(gòu)運(yùn)動(dòng)失效概率最小為目標(biāo)函數(shù)建立了雙動(dòng)壓力機(jī)連桿機(jī)構(gòu)的可靠性優(yōu)化設(shè)計(jì)模型。由于考慮了機(jī)構(gòu)構(gòu)件尺寸的隨機(jī)性,則將機(jī)構(gòu)的確定性優(yōu)化綜合中的約束函數(shù)也處理成隨機(jī)函數(shù),并采用一次二階矩方法求解約束條件的可靠度。數(shù)值實(shí)例表明,機(jī)構(gòu)的可靠性綜合能夠有效減小滑塊位移波動(dòng)量,并且能夠明顯提高機(jī)構(gòu)運(yùn)動(dòng)的可靠度。4、傳動(dòng)機(jī)構(gòu)的穩(wěn)健性設(shè)計(jì)。在壓力機(jī)運(yùn)動(dòng)學(xué)和可靠性分析的基礎(chǔ)上,考慮設(shè)計(jì)變量的不確定對(duì)機(jī)構(gòu)性能的影響,建立機(jī)構(gòu)的可靠性穩(wěn)健性設(shè)計(jì)模型。數(shù)值實(shí)例表明,穩(wěn)健性設(shè)計(jì)能夠有效的控制連桿機(jī)構(gòu)輸出位移波動(dòng)量的均值和標(biāo)準(zhǔn)差,降低了不確定性因素對(duì)輸出位移波動(dòng)量的干擾,提高了機(jī)構(gòu)的可靠性,也同時(shí)提高了壓力機(jī)的整機(jī)性能。
[Abstract]:Mechanical press is a kind of forging equipment which is widely used in forming field. It can meet the requirements of forging process well in performance, and multi-bar mechanism is the main transmission system of this kind of press. The quality of its motion and dynamics is directly related to the forming quality of the product. Therefore, it is very important for the design of the transmission mechanism of the press, and in the design of the transmission mechanism of the press. The traditional method discusses and designs the kinematic and dynamic performance of the mechanism in the deterministic range, but the uncertainties in the mechanism system are inherent, and these uncertainties have a great impact on the performance of the mechanism. In this paper, the kinematics analysis, probabilistic modeling, reliability analysis and design of the driving mechanism of the double-acting press are carried out. The specific contents are as follows: 1. Kinematics analysis of the transmission mechanism. The kinematics analysis equation of the linkage mechanism of the double action press is established, and the analytical solution of the displacement, velocity and acceleration of the mechanism is completed. It lays a foundation for reliability analysis and robust design of mechanism. 2. Probabilistic modeling and reliability analysis of transmission mechanism. The limit state equation of the mechanism slider displacement fluctuation is established within the allowable fluctuation range, and the reliability analysis model of the linkage mechanism of the double-action press is established. The limit state equation is linearized by Taylor series. The mean and variance of the displacement of the slider are derived, and the reliability of the mechanism is obtained by using the first-order second-order moment method. Reliability design of transmission mechanism. Taking the minimum failure probability of mechanism as objective function, the reliability optimization design model of linkage mechanism of double-action press is established. The randomness of component size of mechanism is considered. Then the constraint function in the deterministic optimization synthesis of the mechanism is also treated as a random function, and the reliability of the constraint condition is solved by the first-order second-moment method. The reliability synthesis of the mechanism can effectively reduce the displacement fluctuation of the slider, and can obviously improve the reliability of the mechanism movement. 4, and the robust design of the transmission mechanism, on the basis of kinematics and reliability analysis of the press. Considering the effect of uncertainty of design variables on mechanism performance, the reliability robust design model of mechanism is established. The robust design can effectively control the mean and standard deviation of the output displacement fluctuation of the linkage mechanism, reduce the disturbance of the uncertainty factors to the output displacement fluctuation, and improve the reliability of the mechanism. At the same time, the performance of the press is improved.
【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】：2015
【分類號(hào)】：TG315

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張彤;赫志飛;劉平;盧錦明;;考慮相關(guān)失效時(shí)機(jī)構(gòu)的可靠性分析[J];天津工業(yè)大學(xué)學(xué)報(bào);2011年05期

2 戈璜;;可靠性分析中的參數(shù)估計(jì)[J];青島化工學(xué)院學(xué)報(bào);1986年03期

3 肖惠臨;;回火防止器安全可靠性分析[J];工業(yè)安全與防塵;1988年10期

4 肖惠臨;消毒鍋使用可靠性分析[J];安全;1998年02期

5 岳玉山;石油企業(yè)安全生產(chǎn)與人的可靠性分析[J];石油工業(yè)技術(shù)監(jiān)督;2000年09期

6 張治勇,孫柏濤;抗震可靠性分析的一種實(shí)用方法[J];武漢化工學(xué)院學(xué)報(bào);2000年02期

7 高文宇,張力;人員可靠性分析系統(tǒng)設(shè)計(jì)[J];工業(yè)工程;2003年01期

8 劉文s，

本文編號(hào)：1431643