本文選題：間隙 + 接觸碰撞��； 參考：《南京理工大學(xué)》2012年碩士論文

【摘要】：在高速、重載、高精密的機(jī)械系統(tǒng)中運(yùn)動(dòng)副間隙對(duì)系統(tǒng)動(dòng)力學(xué)響應(yīng)有著重要影響,開(kāi)展間隙動(dòng)力學(xué)的理論、仿真與實(shí)驗(yàn)研究具有重要的工程價(jià)值。本文以某國(guó)防重點(diǎn)項(xiàng)目為研究背景,采用理論建模、實(shí)驗(yàn)測(cè)試和參數(shù)辨識(shí)相結(jié)合的研究方法,對(duì)含間隙的移動(dòng)質(zhì)量-懸臂梁、身管圓柱段-搖架襯套的動(dòng)力學(xué)進(jìn)行探討研究。 以二狀態(tài)法的非線性彈簧阻尼模型為間隙鉸接觸建模方法,利用接觸彈塑性力學(xué)理論研究了計(jì)及間隙、材料屬性的微小間隙轉(zhuǎn)動(dòng)副面-面精細(xì)接觸模型,得到了靜態(tài)的接觸力與接觸變形的非線性關(guān)系,并與傳統(tǒng)的Hertz模型進(jìn)行對(duì)比分析。 使用假設(shè)模態(tài)法離散Euler梁,建立了含間隙的移動(dòng)剛體-懸臂梁橫向耦合振動(dòng)方程,編制了數(shù)值程序,分析了間隙、速度和接觸力參數(shù)對(duì)動(dòng)力學(xué)響應(yīng)的影響。在ADAMS平臺(tái)下使用柔體-剛體接觸模型模擬身管圓柱段與搖架襯套之間的相互作用,由最小二乘擬合獲取Impact接觸力參數(shù),建立了炮身后坐系統(tǒng)的多體動(dòng)力學(xué)模型,進(jìn)行了不同裝配間隙下的數(shù)值計(jì)算,分析了間隙對(duì)接觸碰撞和炮口擾動(dòng)的影響。 搭建了測(cè)量機(jī)構(gòu)間間隙的實(shí)驗(yàn)平臺(tái),完成了不同工況下的動(dòng)態(tài)間隙測(cè)試。由間隙曲線可以間接地識(shí)別機(jī)構(gòu)內(nèi)碰撞的運(yùn)動(dòng)規(guī)律、副元素分離和碰撞的歷程。數(shù)值計(jì)算的間隙曲線與測(cè)試結(jié)果相比一致性較好,驗(yàn)證了理論建模的正確性。 在理論計(jì)算和間隙實(shí)驗(yàn)研究的基礎(chǔ)上,通過(guò)構(gòu)建誤差函數(shù),使用遺傳算法辨識(shí)了移動(dòng)質(zhì)量-懸臂梁之間的面-面接觸的非線性彈簧阻尼系數(shù)；使用ADAMS/Insight的DOE優(yōu)化法,辨識(shí)了身管與搖架襯套的配合間隙、動(dòng)接觸剛度等參數(shù)。由辨識(shí)所得的參數(shù)計(jì)算的間隙曲線與實(shí)驗(yàn)結(jié)果更加吻合。
[Abstract]:In high speed, heavy load and high precision mechanical systems, the clearance of the motion pair has an important influence on the dynamic response of the system. It is of great engineering value to carry out the theoretical, simulation and experimental research on the clearance dynamics. In this paper, based on the research background of a key project of national defense, the dynamics of moving mass cantilever beam with clearance, cylinder segment of body tube and rocker bushing are studied by using the method of theoretical modeling, experimental test and parameter identification. Taking the nonlinear spring damping model of the two-state method as the contact modeling method of the clearance hinge, the contact elasto-plastic mechanics theory is used to study the fine contact model of the micro-clearance rotating pair plane with the material properties. The nonlinear relationship between static contact force and contact deformation is obtained and compared with the traditional Hertz model. Using the assumed mode method to discretize Euler beam, the transverse coupling vibration equation of moving rigid-cantilever beam with clearance is established. A numerical program is developed to analyze the influence of clearance, velocity and contact force parameters on the dynamic response. Based on Adams platform, the interaction between cylinder segment of barrel and rocker bushing is simulated by using flexible body-rigid body contact model. The contact force parameters of impact are obtained by least square fitting, and the multi-body dynamics model of gun recoil system is established. The effects of clearance on contact collision and muzzle disturbance were analyzed. An experimental platform was set up to measure the gap between mechanisms, and the dynamic clearance was tested under different working conditions. The gap curve can indirectly identify the motion law of the collision in the mechanism, the separation of accessory elements and the course of collision. The calculated gap curve is consistent with the measured results, which verifies the correctness of the theoretical modeling. On the basis of theoretical calculation and gap experimental study, the nonlinear spring damping coefficient of surface-surface contact between moving mass and cantilever beam is identified by genetic algorithm by constructing error function, and DOE optimization method of Adams / Insight is used. The parameters such as fit clearance and dynamic contact stiffness between the tube and the rocker bushing are identified. The gap curve calculated from the identified parameters is in good agreement with the experimental results.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH113

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