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F-35 Air Vehicle Technology Overview

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F-35 Air Vehicle Technology Overview ( f-35-air-vehicle-technology-overview )

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Fig. 2 JSF program air vehicle and propulsion systems technology development roadmap. II. Integrated Air Vehicle Subsystems A. Early Design Studies Aircraft subsystems have traditionally been designed using a federated approach consisting of a number of independently designed subsystems. JSF-sponsored studies showed the potential for significant benefits from integrating these functions. This applied to three subsystems: flight controls and actuation systems, electrical and auxiliary power systems, and the environmental control system (ECS). Results from the studies showed that the effective integration of these three key subsystems could significantly improve aircraft performance and dramatically reduce the amount of equipment required. In doing so, it would provide improved affordability and warfighting benefits essential to F-35 program goals. In conventional systems, electrical, hydraulic, pneumatic, and mechanical power are generated and distributed from the engines and auxiliary power system. The government-funded SUIT [1-7], MEA, and VITPS [8-9] studies showed the potential benefits of eliminating or shrinking the conventional centralized hydraulic system. They also showed the potential benefits of reducing engine bleed air extraction [1-7]. AFRL sponsored SUIT in the late 1980s and early 1990s to look into what could be gained from more efficient integrations of selected air vehicle subsystems [39]. The original SUIT concept was to replace single-function subsystem equipment with multifunctional hardware, potentially reducing volume and weight while increasing overall efficiency. Later, the objective of using the engine’s fan air stream as a sink for waste heat from the subsystems was added. Concurrently, AFRL’s propulsion laboratory was independently pursuing MEA technology, including electrically powered flight control actuation and robust electric power generation and distribution system concepts. As a result, MEA system and component technologies were undergoing development and testing through several separate and independent initiatives. Between 1994 and 1995 the JAST program identified key technology building blocks to support the development of an advanced strike capability. The idea was to screen candidate technologies for their applicability based on their respective payoffs with regard to the four JSF program pillars: affordability, lethality, survivability, and supportability. At that time, three weapons systems contractors (WSCs) were actively competing to win JSF: Lockheed Martin, Approved for public release 5/8/18, JSF18-365 3

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