【摘要】：隨著現(xiàn)代科技的發(fā)展,機(jī)械不斷地向高速、輕質(zhì)、重載,高精度方向發(fā)展。機(jī)構(gòu)運(yùn)動(dòng)精度已成為影響機(jī)械產(chǎn)品質(zhì)量的重要因素。通常影響機(jī)構(gòu)運(yùn)動(dòng)精度的因素有構(gòu)件幾何公差、運(yùn)動(dòng)副間隙、構(gòu)件的受力受熱變形、構(gòu)件的材料和機(jī)構(gòu)運(yùn)動(dòng)輸入波動(dòng)等。本文以平面連桿為研究對(duì)象,對(duì)考慮尺寸公差、運(yùn)動(dòng)副間隙和結(jié)構(gòu)誤差的平面四桿機(jī)構(gòu)進(jìn)行了機(jī)構(gòu)運(yùn)動(dòng)精度可靠性分析。本文給出了機(jī)構(gòu)運(yùn)動(dòng)精度的一般理論,同時(shí)采用環(huán)路矢量微分法建立了含間隙平面連桿機(jī)構(gòu)運(yùn)動(dòng)精度模型�；谇懊鏅C(jī)構(gòu)運(yùn)動(dòng)精度模型采用一次二階矩法對(duì)機(jī)構(gòu)運(yùn)動(dòng)精度可靠性進(jìn)行了瞬時(shí)及時(shí)變可靠性分析。為了檢驗(yàn)本文所采用解析法的正確性,本文給出了蒙特卡洛方法結(jié)果進(jìn)行對(duì)照。然后對(duì)考慮結(jié)構(gòu)誤差的平面連桿機(jī)構(gòu)的機(jī)構(gòu)運(yùn)動(dòng)精度可靠性處理,本文提出等效誤差模型的方法將其轉(zhuǎn)換為不含結(jié)構(gòu)誤差的機(jī)構(gòu)進(jìn)行求解,該方法揭示了結(jié)構(gòu)誤差對(duì)機(jī)構(gòu)運(yùn)動(dòng)精度可靠性的作用機(jī)理。將解析法與蒙特卡洛方法結(jié)果對(duì)比,驗(yàn)證了本文所采用的隨機(jī)模型、機(jī)構(gòu)運(yùn)動(dòng)精度模型和機(jī)構(gòu)運(yùn)動(dòng)精度可靠性理論是合理有效的。
[Abstract]:With the development of modern science and technology, machinery continues to develop in the direction of high speed, light weight, heavy load and high precision. Mechanism motion accuracy has become an important factor affecting the quality of mechanical products. Generally, the factors that affect the kinematic accuracy of the mechanism include the geometric tolerance of the component, the clearance of the moving pair, the thermal deformation of the component under force, the fluctuation of the material and the motion input of the mechanism and so on. In this paper, the reliability analysis of kinematic accuracy of planar four-bar mechanism considering dimensional tolerance, clearance of kinematic pair and structural error is carried out with planar connecting rod as the research object. In this paper, the general theory of the kinematic accuracy of the mechanism is given, and the kinematic accuracy model of the planar linkage with clearance is established by using the loop vector differential method. Based on the motion accuracy model of the front mechanism, the reliability of the kinematic accuracy of the mechanism is analyzed by means of the first order second moment method, and the instantaneous and time varying reliability analysis is carried out. In order to verify the correctness of the analytical method used in this paper, the results of Monte Carlo method are compared. Then, to deal with the reliability of the kinematic accuracy of the planar linkage mechanism considering the structural error, the equivalent error model is proposed in this paper, which can be transformed into a mechanism without structural error to solve the problem. This method reveals the mechanism of the effect of structural error on the reliability of the kinematic accuracy of the mechanism. The results of the analytical method and Monte Carlo method are compared to verify that the stochastic model, the kinematic accuracy model of the mechanism and the reliability theory of the kinematic accuracy of the mechanism are reasonable and effective.
【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】：2013
【分類(lèi)號(hào)】：TH112

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