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通过分析热沉调温系统中热沉、载冷剂、试件间的热量传递关系,在工程应用允许的范围内,基于一定的假设,对热沉与载冷剂、热沉与试件以及试件本身3部分分别进行了热学模型的建模分析,并将以上3个模型通过模糊PID控制算法进行关联,仿真模拟了载冷剂先通过对流换热控制热沉温度,热沉再通过辐射换热来控制试件温度的整个调温过程。结果显示调温过程初期试件温度迅速降低;接近目标温度后,载冷剂温度升高带动热沉温度升高,从而减小试件温度降温速度;系统稳定到目标温度设定偏差范围内后,试件温度收敛,热沉与载冷剂温度维持恒定状态。
By analyzing the heat transfer relationship between heat sink, coolant and specimen in the heat transfer thermostat system, based on certain assumptions, the heat transfer between heat sink and coolant, heat sink and specimen and The three parts of the specimen itself are respectively subjected to the modeling of the thermal model. The above three models are related by the fuzzy PID control algorithm. The simulation results show that the temperature of the heat sink is controlled by the convective heat transfer first, and the heat sink then passes through the radiation Heat transfer to control the temperature of the entire specimen tempering process. The results showed that the temperature of the specimen decreased rapidly at the initial stage of the temperature control. After the temperature approached the target temperature, the temperature of the carrier fluid increased and the temperature of the heat sink was increased. As a result, , The specimen temperature convergence, heat sink and refrigerant temperature maintained at a constant state.