Mission-Oriented Missile Equipment Support System Modeling: Considering the Failure and Health State

Table 2

Health levels and control strategies.

Health levels	Equipment states	Health control strategies
			Blue level	The state that has no impact on the performance. Performance parameters are within the normal range. The equipment is fully functional and there is a long time before the failure.	No support measures are taken.
Yellow level	The state that has little impact on the equipment executing its mission. Performance parameters have a tendency of degradation, but there is still a long time before the failure.	A signal can be transmitted to indicate that the equipment needs maintenance. Some auxiliary measures can be taken to reduce the rate of equipment degradation, such as ventilation and cleaning, to improve equipment work or storage environment.
Orange level	The state that greatly affects the performance. Performance parameters are close to the failure thresholds. Although failure has not occurred, but it can obviously show a trend of degradation. The probability of failure is greatly increased.	A signal can be transmitted to indicate that the equipment needs maintenance. According to the mission schedule and the state of other equipment, determine whether to allow the equipment to exit the mission and whether to repair the equipment.
Red level	The state that has a significant impact on the equipment executing its mission. Performance parameters have reached the failure thresholds. The equipment has failed and cannot work properly.	The equipment is allowed to exit the mission and enter the maintenance state. The corresponding maintenance work is carried out according to the support resources.