本文選題：凸輪 + 虛擬樣機(jī)　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：針對現(xiàn)有煤礦井下軌道牽引機(jī)車制動系統(tǒng)存在的反應(yīng)時間慢、空程距離長、制動能力差等問題,本文提出了一種空間凸輪連桿機(jī)構(gòu)結(jié)合鼓式制動器的機(jī)械式制動方案。通過建立虛擬樣機(jī)的方法,對制動系統(tǒng)進(jìn)行制動性能的動力學(xué)仿真;同時,采用有限元分析法對制動系統(tǒng)重要部件——制動鼓進(jìn)行接觸分析。在分析現(xiàn)有機(jī)械制動結(jié)構(gòu)的基礎(chǔ)上,結(jié)合空間凸輪機(jī)構(gòu)高效、輕便的優(yōu)點(diǎn),合理設(shè)計凸輪輪廓曲線,正確布置連桿位置,得到凸輪連桿機(jī)構(gòu),進(jìn)行制動力的傳遞,并采用領(lǐng)從蹄式鼓式制動器作為制動執(zhí)行機(jī)構(gòu),對整車制動。利用虛擬樣機(jī)技術(shù)對制動系建模,并用ADAMS軟件對制動系進(jìn)行制動性能的動力學(xué)仿真得到制動過程中作用力、制動力矩等動力學(xué)參數(shù)及反映制動性能的制動時間、制動距離等參數(shù)。將實(shí)際仿真結(jié)果與理論分析結(jié)果進(jìn)行對比驗證,兩者誤差在8%的誤差范圍內(nèi),且制動距離、制動時間等參數(shù)均符合《煤礦安全章程》的規(guī)定,證明了虛擬樣機(jī)模型仿真的正確性與可行性。通過有限元分析軟件ANSYS/Workbench對制動鼓進(jìn)行接觸分析。采用預(yù)加載的方法式,得到領(lǐng)、從蹄的實(shí)際制動效能因數(shù);并分析實(shí)際作用力下制動器各部件的應(yīng)力情況以及接觸應(yīng)力分布規(guī)律。制動器各部件的應(yīng)力分布表征其結(jié)構(gòu)強(qiáng)度符合要求;接觸壓力分布規(guī)律與現(xiàn)有余弦分布理論基本一致,驗證了接觸分析的正確性。針對仿真與理論存在的誤差,對制動器結(jié)構(gòu)參數(shù)——摩擦初始角進(jìn)行優(yōu)化設(shè)計,優(yōu)化后的結(jié)果明顯更接近理論值,驗證了優(yōu)化設(shè)計的可行性、正確性,為以后制動器的設(shè)計與優(yōu)化提供了理論依據(jù)。
[Abstract]:Aiming at the problems of low reaction time, long air distance and poor braking ability in the braking system of underground rail tractor in coal mine, a mechanical braking scheme of spatial cam linkage mechanism combined with drum brake is proposed in this paper. The dynamic simulation of braking performance is carried out by establishing virtual prototype, and the contact analysis of brake drum, an important part of braking system, is carried out by using finite element analysis method. On the basis of analyzing the existing mechanical braking structure and combining the advantages of high efficiency and portability of spatial cam mechanism, the cam contour curve is reasonably designed, the position of connecting rod is arranged correctly, the cam linkage mechanism is obtained, and the braking force is transferred. The drum brake is used as brake actuator to brake the whole vehicle. The braking system is modeled by virtual prototyping technology, and the dynamic parameters such as force, braking torque and braking time are obtained by using Adams software to simulate the braking performance of the brake system. Braking distance and other parameters. The actual simulation results are compared with the theoretical analysis results. The error is within the range of 8%, and the parameters such as braking distance and braking time are in accordance with the regulations of Coal Mine Safety regulations. The correctness and feasibility of virtual prototype model simulation are proved. The contact analysis of brake drum is carried out by finite element analysis software ANSYS / Workbench. By using the method of preloading, the actual braking efficiency factor of the collar and the shoe is obtained, and the stress and contact stress distribution of the parts of the brake under the actual force are analyzed. The stress distribution of various parts of the brake shows that the structural strength meets the requirements, and the distribution of contact pressure is basically consistent with the existing cosine distribution theory, which verifies the correctness of the contact analysis. In view of the error between simulation and theory, the optimum design of brake structural parameter-friction initial angle is carried out. The result of optimization is obviously closer to the theoretical value, which verifies the feasibility and correctness of the optimal design. It provides a theoretical basis for the design and optimization of brake.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD524

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本文編號：2102239