本文選題：盤式制動(dòng)器 + 傳熱學(xué)反問題��； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：制動(dòng)器是車輛安全系統(tǒng)中極為重要的執(zhí)行部件。制動(dòng)器制動(dòng)過程伴隨著劇烈的溫度場(chǎng)、應(yīng)力場(chǎng)和磨損的耦合現(xiàn)象。制動(dòng)盤作為制動(dòng)器的主要部件,能準(zhǔn)確獲得它在制動(dòng)過程中的溫度場(chǎng)分布是研究這一耦合現(xiàn)象的前提,對(duì)制動(dòng)器的設(shè)計(jì)優(yōu)化、制動(dòng)和控制策略的選擇有著至關(guān)重要的意義。隨著計(jì)算科學(xué)的發(fā)展和計(jì)算機(jī)性能的提高,數(shù)值模擬方法在制動(dòng)盤的溫度場(chǎng)研究中得到了廣泛的應(yīng)用。然而在目前的研究中,制動(dòng)盤和摩擦片之間熱流分配系數(shù)的確定仍存在著分歧與不足。熱流分配系數(shù)不準(zhǔn)確,會(huì)對(duì)制動(dòng)盤摩擦面熱流的計(jì)算造成負(fù)面影響,進(jìn)而使得數(shù)值模擬結(jié)果不能準(zhǔn)確反應(yīng)溫度場(chǎng)的實(shí)際變化情況。針對(duì)這一問題,采用傳熱學(xué)反問題(Inverse Heat Conduction Problem,IHCP)的方法,根據(jù)制動(dòng)盤內(nèi)部測(cè)點(diǎn)的溫度信息,反演作為邊界條件的瞬態(tài)熱流,避免了熱流分配系數(shù)不準(zhǔn)確的困擾,不失為一種可行的方案。本文采用動(dòng)態(tài)控制矩陣(Dynamic Matrix Control,DMC)反演算法對(duì)盤式制動(dòng)器制動(dòng)盤的瞬態(tài)熱邊界條件進(jìn)行反演,并在此基礎(chǔ)上重構(gòu)了其溫度分布。主要的研究工作如下:(1)建立了盤式制動(dòng)器制動(dòng)盤的二維非穩(wěn)態(tài)傳熱模型,利用有限容積法求解了制動(dòng)盤在制動(dòng)過程中的瞬態(tài)溫度分布,并對(duì)模型的正確性進(jìn)行了驗(yàn)證。(2)結(jié)合制動(dòng)盤傳熱正問題模型,將制動(dòng)盤表面熱流分布作為待反演參數(shù),根據(jù)制動(dòng)盤內(nèi)部的溫度測(cè)點(diǎn)信息,使用DMC反演算法及MATLAB軟件平臺(tái)建立了反演模型,并以此為基礎(chǔ)重構(gòu)了制動(dòng)盤的瞬態(tài)溫度場(chǎng)。(3)通過仿真試驗(yàn)對(duì)兩種工作條件下的制動(dòng)盤瞬態(tài)熱流和溫度分布進(jìn)行了反演,討論了溫度測(cè)點(diǎn)數(shù)目、測(cè)量誤差、未來時(shí)間步和測(cè)點(diǎn)位置對(duì)反演結(jié)果的影響。依據(jù)文獻(xiàn)的試驗(yàn)數(shù)據(jù)進(jìn)行仿真,進(jìn)一步驗(yàn)證了DMC反演算法在解決制動(dòng)盤傳熱反問題中的有效性。
[Abstract]:Brake is one of the most important parts in vehicle safety system. The braking process of brake is accompanied by the coupling of temperature field, stress field and wear. As the main part of brake, it is the premise of studying the coupling phenomenon that the brake disc can accurately obtain the temperature field distribution in the braking process, which is of great significance to the design optimization of brake, the choice of braking and control strategy. With the development of computer science and the improvement of computer performance, numerical simulation method has been widely used in the study of temperature field of brake disc. However, in the present research, the determination of heat flux distribution coefficient between brake disc and friction disc is still different and insufficient. The inaccurate heat flux distribution coefficient will have a negative effect on the calculation of the heat flux on the friction surface of the brake disc, and the numerical simulation results will not accurately reflect the actual variation of the temperature field. In order to solve this problem, the inverse Heat Conduction Heat Conduction problem (IHCP) method is used to reverse the transient heat flux, which is used as boundary condition, according to the temperature information of the measuring point inside the brake disc, thus avoiding the problem of inaccurate heat flux distribution coefficient. It is a feasible scheme. In this paper, the transient thermal boundary conditions of disc brake disc are inversed by dynamic Matrix Control (DMC) inversion algorithm, and the temperature distribution is reconstructed. The main research work is as follows: (1) the two-dimensional unsteady heat transfer model of disc brake disc is established, and the transient temperature distribution of brake disc during braking process is solved by the finite volume method. The correctness of the model is verified. 2) combined with the positive heat transfer model of the brake disc, the heat flux distribution on the surface of the brake disc is taken as the parameter to be retrieved, according to the information of the temperature measurement point inside the brake disc. The inversion model is established by using DMC inversion algorithm and MATLAB software platform, and the transient temperature field of brake disc is reconstructed on the basis of this model. The transient heat flux and temperature distribution of brake disc under two working conditions are inversed by simulation experiments. The effects of the number of temperature measurement points, the measurement error, the future time step and the position of the measuring points on the inversion results are discussed. According to the experimental data in literature, the effectiveness of DMC inversion algorithm in solving the heat transfer inverse problem of brake disc is further verified.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U463.512

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本文編號(hào)：1832221