Assume that the block diagram of a temperature-regulating space-suit to be worn by an astronaut for...
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Assume that the block diagram of a temperature-regulating space-suit to be worn by an astronaut for a mission to Mars is as shown in Figure P3.1. The variable x represents the external temperature while y represents the temperature inside the space-suit. Gc is the steady-state gain of the heating/cooling device (controller) built into the space-suit, while Gp represents the steady state gain associated with the thermal characteristics of the astronaut. H is the gain with which the internal temperature is fed back to the controller. The operating internal temperature (y) is allowed to range from 60°F to 100°F. Assume that Gc = 2, Gp = 1, and H = 1. (a) What range of external temperatures can this space-suit be used for, if it is deployed in open-loop mode? (b) What is the permissible range of external temperatures when the space-suit is deployed in closed-loop mode? (c) Based on the results obtained in (a) and (b), what can you conclude about the effect of negative feedback in this device? Internal External Temperature G. Gp Temperature, y Heater/Cooler Astronaut Temperature Sensor Figure P3.1 Block diagram of the temperature control system of a space-suit. Assume that the block diagram of a temperature-regulating space-suit to be worn by an astronaut for a mission to Mars is as shown in Figure P3.1. The variable x represents the external temperature while y represents the temperature inside the space-suit. Gc is the steady-state gain of the heating/cooling device (controller) built into the space-suit, while Gp represents the steady state gain associated with the thermal characteristics of the astronaut. H is the gain with which the internal temperature is fed back to the controller. The operating internal temperature (y) is allowed to range from 60°F to 100°F. Assume that Gc = 2, Gp = 1, and H = 1. (a) What range of external temperatures can this space-suit be used for, if it is deployed in open-loop mode? (b) What is the permissible range of external temperatures when the space-suit is deployed in closed-loop mode? (c) Based on the results obtained in (a) and (b), what can you conclude about the effect of negative feedback in this device? Internal External Temperature G. Gp Temperature, y Heater/Cooler Astronaut Temperature Sensor Figure P3.1 Block diagram of the temperature control system of a space-suit.
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