III. Reliability in Design and Development
A. Reliability design techniques
1. Environmental and use factors (Apply)
Identify environmental and use factors (e.g., temperature, humidity, vibration) and stresses (e.g., severity of service, electrostatic discharge (ESD), throughput) to which a product may be subjected.
Additional References
The Environmental Test Manual (article)
SOR 043 Environmental Testing and Reliability (podcast)
Quick Quiz
1-10. How would you describes the events and operating conditions an item experiences from mission initiation to completion (e.g., research and development phase, product manufacturing phase, …, to mission completion)?
(A) operational profile
(B) mission profile
(C) design reliability
(D) mission reliability
(B) mission profile
The terms “operating” and “mission” in the question basically give this one away. The mission profile includes the activities, events, stresses, decisions, usage, capability, and environmental factors that fully describe what the system may experience over a use cycle as it accomplishes a specific goal. Think a commercial airliner, all the elements that make up a flight between cities, from fueling, boarding, take-off, to landing, disembarking, and cabin cleaning, as a mission profile associated with safely transporting passengers and cargo to the desired destination.
The operational profile is a subset of the mission profile as it does not include the events associated with accomplishing the goal. Generally the operational profiles focuses on the stresses and loads experienced during the mission or period of use.
The design and mission reliability relate to the probability of the system successfully completing the mission.
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