Research on Ground Simulation Method of Heat Transfer Characteristics for Space High-Temperature Material Experimental Furnace Based on Data-Driven Approach
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摘要: 晶体生长过程中温度的稳定性对晶体形貌及结构有着显著影响,为了提高晶体的性能及质量,必需要保证晶体生长过程中温度的稳定性。现阶段我国空间高温材料科学实验炉均采用PID控制器对晶体生长温度进行控制。由于空间实验机会珍贵且稀少,控制参数的整定工作需要在地面完成。然而,由于地面与空间环境传热的不同,导致高温材料实验炉的传热特性存在差异,其传递函数也不相同,若将地面整定的控制参数直接应用于空间工况,将会导致温控效果变差。为此,本文提出了一种基于数据驱动的减压法,在地面实现了对空间微重力环境下高温炉传热特性的近似与模拟,并给出了地面适配工况的压强值,克服了传统减压法由于先验知识缺乏导致地面适配工况压强难以确定的问题。Abstract: The temperature stability during the crystal growth process has a significant impact on the morphology and structure of the crystal. In order to improve the quality of crystals, it is necessary to ensure the stability of temperature throughout the crystal growth process. Currently, in China, PID controllers are used to control the crystal growth temperature in space high-temperature material science experimental furnaces. Due to the limited and scarce opportunities for space experiments, the tuning of control parameters needs to be completed on the ground. However, due to the difference in heat transfer between the ground and space environments, there are differences in the heat transfer characteristics of the furnace, and its transfer functions are also different. If the control parameters tuned on the ground are directly applied to space conditions, it will result in a worse temperature control effect. To address this, this paper proposes a data-driven depressurization method that approximates and simulates the heat transfer characteristics of the furnace under microgravity environments on the ground, and provides the pressure values for ground adaptation conditions. This overcomes the problem of the traditional depressurization method being difficult to determine the pressure value for ground adaptation conditions due to lack of prior knowledge.
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