制动盘的热边界条件反演及温度场重构

发布时间：2018-05-02 03:38

  本文选题：盘式制动器 + 传热学反问题　； 参考：《重庆大学》2016年硕士论文

【摘要】：制动器是车辆安全系统中极为重要的执行部件。制动器制动过程伴随着剧烈的温度场、应力场和磨损的耦合现象。制动盘作为制动器的主要部件,能准确获得它在制动过程中的温度场分布是研究这一耦合现象的前提,对制动器的设计优化、制动和控制策略的选择有着至关重要的意义。随着计算科学的发展和计算机性能的提高,数值模拟方法在制动盘的温度场研究中得到了广泛的应用。然而在目前的研究中,制动盘和摩擦片之间热流分配系数的确定仍存在着分歧与不足。热流分配系数不准确,会对制动盘摩擦面热流的计算造成负面影响,进而使得数值模拟结果不能准确反应温度场的实际变化情况。针对这一问题,采用传热学反问题(Inverse Heat Conduction Problem,IHCP)的方法,根据制动盘内部测点的温度信息,反演作为边界条件的瞬态热流,避免了热流分配系数不准确的困扰,不失为一种可行的方案。本文采用动态控制矩阵(Dynamic Matrix Control,DMC)反演算法对盘式制动器制动盘的瞬态热边界条件进行反演,并在此基础上重构了其温度分布。主要的研究工作如下:(1)建立了盘式制动器制动盘的二维非稳态传热模型,利用有限容积法求解了制动盘在制动过程中的瞬态温度分布,并对模型的正确性进行了验证。(2)结合制动盘传热正问题模型,将制动盘表面热流分布作为待反演参数,根据制动盘内部的温度测点信息,使用DMC反演算法及MATLAB软件平台建立了反演模型,并以此为基础重构了制动盘的瞬态温度场。(3)通过仿真试验对两种工作条件下的制动盘瞬态热流和温度分布进行了反演,讨论了温度测点数目、测量误差、未来时间步和测点位置对反演结果的影响。依据文献的试验数据进行仿真,进一步验证了DMC反演算法在解决制动盘传热反问题中的有效性。
[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.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.512

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