ESA Document - Emits - ESA
ESA Document - Emits - ESA ESA Document - Emits - ESA
s HMM Assessment Study Report: CDF-20(A) February 2004 page 296 of 422 Figure 4-45: MEV Modes The MEV power subsystem has to cope with three different types of mission requirements: • during the descent: power needs to be supplied in a short time with some peak power constraint (pyros…) • during the surface operations: important level of power needs to be supplied for a long duration with possibility to generate power • during the launch, the parking orbits and the rendezvous: power needs to be supplied for a few days with a possibility to store energy during the sunlight, to have enough energy available for the eclipses and non-Sun pointed phases. Since the power system designed for the surface operations is able to cope with high power level during periods of 14 hours, it can also cover the energy requirements for the descent phase. Therefore, it has been chosen in this study not to develop a specific power subsystem for the descent phase. Nevertheless, a dedicated DM power subsystem is not excluded given that its mass would be negligible compared to the total MEV mass. On the MAV’s side, the mass is an important mission driver. Consequently, the implementation of the huge power subsystem required for the surface operation inside the MAV has been rejected. However, such a design would be possible in some particular cases for example when using fuel cells by keeping the useless and empty reactant tanks outside of the MAV. The MEV power system is composed of: • one power system inside the SHM which is also used by the DM • one power system located in the MAV for supplying the power after the launch from Mars. These two subsystems are completely independent, except that the MAV power subsystem can be charged by the SHM power system to the launch. 4.3.5.2.2 Power requirements In this study, the power requirements have been computed unit per unit and mode per mode (DM: Figure 4-46, SHM: Figure 4-47, MAV: Figure 4-48). Each unit power profile is defined by three values: • a peak power • a standby power
s • a duty cycle value (duration of the peak power compared to the total duration) HMM Assessment Study Report: CDF-20(A) February 2004 page 297 of 422 For every mode, the peak and standby values have been added to obtain the values at system level. An equivalent duty cycle has also been computed to keep the same level of energy (See Figure 4-49). Figure 4-46: DM power inputs
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s<br />
• a duty cycle value (duration of the peak power compared to the total duration)<br />
HMM<br />
Assessment Study<br />
Report: CDF-20(A)<br />
February 2004<br />
page 297 of 422<br />
For every mode, the peak and standby values have been added to obtain the values at system<br />
level. An equivalent duty cycle has also been computed to keep the same level of energy (See<br />
Figure 4-49).<br />
Figure 4-46: DM power inputs
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