Search Results

One of the thrusts of the Advanced Integrated Fuel System (AIFS) initiative, sponsored by the Fuels Branch of the Aero and Propulsion Power Directorate at Wright Laboratories (WL/POSF) with partial funding from the United States Navy, is to realize the potential improvements in aircraft thermal management systems due to the 100 degrees F increase in fuel heat sink capacity of JP-8+100 fuel. This paper summarizes the conceptual design and top-level trade studies conducted by Northrop Grumman Corporation (NGC) under an AIFS contract. These studies examined the air vehicle-level payoffs of JP-8+100 fuel applied to the (1) F/A-18C/D (representing an existing fleet aircraft), (2) F/A-18E/F (representing an aircraft currently under development), and (3) a more-electric aircraft/subsystem integration technology (MEA/SUIT) configured version of an F/A-18 (representing a future aircraft). The objectives and approaches of these studies are presented.

As More Electric Aircraft design becomes the preferred system concept for several aerospace platforms, the electro-mechanical actuator (EMA) is emerging as a solution of choice for the primary flight control actuation system. This paper will give a brief history of electric actuation for flight systems, diagnosis and prognosis demonstrations and current state of health management research. AFRL and NASA working with industry and academic partners have been developing health management technologies that will help prevent the occurrence of some inherent EMA failure modes. Advanced fault diagnostics and failure prognostics were applied to the critical failure modes identified in the Failure Mode, Effects, and Criticality Analysis (FMECA). Modeling and simulation of EMA with degraded components were developed to support the design and evaluation of physics-based algorithms. Test data were generated using EMA hardware to validate high-fidelity EMA and physics-of-failure models.

Minimizing energy use on more electric aircraft (MEA) requires examining in detail the important decision of whether and when to use engine bleed air, ram air, electric, hydraulic, or other sources of power. Further, due to the large variance in mission segments, it is unlikely that a single energy source is the most efficient over an entire mission. Thus, hybrid combinations of sources must be considered. An important system in an advanced MEA is the adaptive power and thermal management system (APTMS), which is designed to provide main engine start, auxiliary and emergency power, and vehicle thermal management including environmental cooling. Additionally, peak and regenerative power management capabilities can be achieved with appropriate control. The APTMS is intended to be adaptive, adjusting its operation in order to serve its function in the most efficient and least costly way to the aircraft as a whole.