發(fā)布時(shí)間：2018-06-16 06:39

  本文選題：螺栓固定結(jié)合面 + 動(dòng)態(tài)特性��； 參考：《哈爾濱工業(yè)大學(xué)》2012年碩士論文

【摘要】：螺栓固定聯(lián)接是機(jī)械結(jié)構(gòu)中最為普遍的一種零件聯(lián)接方式，其聯(lián)接面處的非線性特性是影響整體結(jié)構(gòu)動(dòng)態(tài)特性的主要因素。在現(xiàn)代機(jī)械高速化、高精度化及輕質(zhì)化的趨勢(shì)下，機(jī)械設(shè)計(jì)逐漸由靜態(tài)設(shè)計(jì)轉(zhuǎn)向動(dòng)態(tài)設(shè)計(jì)，分析所設(shè)計(jì)結(jié)構(gòu)的動(dòng)態(tài)特性是動(dòng)態(tài)設(shè)計(jì)的關(guān)鍵。因此，研究螺栓固定結(jié)合面的動(dòng)態(tài)特性對(duì)結(jié)構(gòu)設(shè)計(jì)及其優(yōu)化具有極為重要的意義。 本文從宏觀角度分析了固定結(jié)合面的剛度和阻尼產(chǎn)生機(jī)理，建立了結(jié)合面的等效動(dòng)力學(xué)模型；在微觀方面建立了尺寸獨(dú)立的分形結(jié)合面模型，通過(guò)MATLAB仿真得到結(jié)合面的法向和切向動(dòng)態(tài)特性與面壓力、表面粗糙度、真實(shí)接觸面積等因素的關(guān)系。 設(shè)計(jì)了考慮結(jié)合面影響因素權(quán)重的動(dòng)態(tài)實(shí)驗(yàn)，建立了HT200、2Cr13材料在磨削和銑削條件下不同粗糙度的動(dòng)態(tài)特性參數(shù)數(shù)據(jù)表；分析了螺栓預(yù)緊力、接觸表面加工方式及表面粗糙度、不同接觸面積對(duì)結(jié)合面動(dòng)態(tài)特性的影響規(guī)律，驗(yàn)證了理論仿真結(jié)果的正確性。 分別采用Glue粘接法、接觸處理法和彈簧-阻尼單元等效法模擬了結(jié)合面的接觸狀況，比較了三種方法的優(yōu)缺點(diǎn)及模擬精度；在研究了螺栓固定結(jié)合面的動(dòng)態(tài)特性基礎(chǔ)上，，提出了一種基于壓力云圖分布彈簧-阻尼單元的結(jié)合面建模方法；對(duì)HT200試件模態(tài)實(shí)驗(yàn)結(jié)果曲線擬合，建立了單位面積法向和切向動(dòng)態(tài)特性與面應(yīng)力的指數(shù)擬合曲線，將擬合參數(shù)代入模型，利用ANSYS軟件對(duì)基于壓力云圖分布彈簧-阻尼單元的模型仿真，與實(shí)驗(yàn)結(jié)果及傳統(tǒng)模型對(duì)比，驗(yàn)證了本模型的精確性。
[Abstract]:Bolt fixed connection is the most common part connection in mechanical structure. The nonlinear characteristics of the joint surface are the main factors that affect the dynamic characteristics of the whole structure. Under the trend of high speed, high precision and light weight of modern machinery, mechanical design is gradually changing from static design to dynamic design. The key to dynamic design is to analyze the dynamic characteristics of the structure. Therefore, it is very important to study the dynamic characteristics of bolt fixed joints for structural design and optimization. In this paper, the mechanism of stiffness and damping of the fixed joint surface is analyzed from the macro angle, the equivalent dynamic model of the binding surface is established, and the fractal joint surface model with independent dimensions is established in the microscopic aspect. The relationship between the normal and tangential dynamic characteristics of the combined surface and the factors such as surface pressure, surface roughness, real contact area and so on is obtained by MATLAB simulation. In this paper, the dynamic experiment considering the weight of the influence factors on the bonding surface is designed, and the data table of dynamic characteristic parameters of different roughness under grinding and milling conditions is established, and the pre-tightening force of bolt, the processing method of contact surface and the surface roughness are analyzed. The effect of different contact areas on the dynamic characteristics of the bonding surface is verified by the theoretical simulation results. Glue bonding method, contact treatment method and spring-damping element equivalent method are used to simulate the contact status of the joints, and the advantages, disadvantages and simulation accuracy of the three methods are compared. In this paper, a modeling method of joint surface based on pressure cloud image distribution spring damping element is proposed, and the exponential fitting curves of normal and tangential dynamic characteristics and plane stress of unit area are established by fitting the experimental results of HT200 specimen. The fitting parameters are substituted into the model, and the model based on the pressure cloud image distribution spring and damping element is simulated by ANSYS software. Compared with the experimental results and the traditional model, the accuracy of the model is verified.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH131

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