Nyberg K L, Diller K R, Wissler E H
Department of Mechanical Engineering,The University of Texas at Austin, 78712, USA.
J Biomech Eng. 2001 Feb;123(1):114-20. doi: 10.1115/1.1336147.
The Wissler human thermoregulation model was augmented to incorporate simulation of a space suit thermal control system that includes interaction with a liquid cooled garment (LCG) and ventilation gas flow through the suit. The model was utilized in the design process of an automatic controller intended to maintain thermal neutrality of an exercising subject wearing a liquid cooling garment. An experimental apparatus was designed and built to test the efficacy of specific physiological state measurements to provide feedback data for input to the automatic control algorithm. Control of the coolant inlet temperature to the LCG was based on evaluation of transient physiological parameters that describe the thermal state of the subject, including metabolic rate, skin temperatures, and core temperature. Experimental evaluation of the control algorithm function was accomplished in an environmental chamber under conditions that simulated the thermal environment of a space suit and transient metabolic work loads typical of astronaut extravehicular activity (EVA). The model was also applied to analyze experiments to evaluate performance of the automatic control system in maintaining thermal comfort during extensive transient metabolic profiles for a range of environmental temperatures. Finally, the model was used to predict the efficacy of the LCG thermal controller for providing thermal comfort for a variety of regiments that may be encountered in future space missions. Simulations with the Wissler model accurately predicted the thermal interaction between the subject and LCG for a wide range of metabolic profiles and environmental conditions and matched the function of the automatic temperature controller for inlet cooling water to the LCG.
维斯勒人体体温调节模型得到了扩展，以纳入对航天服热控系统的模拟，该系统包括与液冷服（LCG）的相互作用以及通过航天服的通风气流。该模型被用于设计一个自动控制器，旨在维持穿着液冷服进行锻炼的受试者的热中性。设计并构建了一个实验装置，以测试特定生理状态测量的有效性，从而为自动控制算法提供反馈数据输入。对液冷服冷却液入口温度的控制基于对描述受试者热状态的瞬态生理参数的评估，这些参数包括代谢率、皮肤温度和核心温度。控制算法功能的实验评估是在一个环境舱内完成的，该环境模拟了航天服的热环境以及宇航员舱外活动（EVA）典型的瞬态代谢工作负荷。该模型还被用于分析实验，以评估自动控制系统在一系列环境温度下的广泛瞬态代谢曲线中维持热舒适性的性能。最后，该模型被用于预测液冷服热控制器为未来太空任务中可能遇到的各种任务提供热舒适性的功效。使用维斯勒模型进行的模拟准确地预测了受试者与液冷服在广泛的代谢曲线和环境条件下的热相互作用，并与液冷服入口冷却水自动温度控制器的功能相匹配。
