Page 18 - ASME DSCC 2015 Program

Technical Program

WEDNESDAY, OCTOBER, 28 online Prognostics for fuel Thermal Management System
Invited session paper. DSCC2015-9842
InVITED SESSIon Martin P. DeSimio, University of Dayton Research Institute, Dayton, OH,
2-17-1 WA1 Aerospace Power optimization United States, Brandon M. Hencey, Adam C. Parry, Air Force Research
George Bellows A 10:00am–12:00pm Laboratory, Wright-Patterson AFB, OH, United States

Modern tactical aircraft subsystems face challenging weight and volume lim-
Session Organizer: Timothy Deppen, University of Illinois
itations. In addition, power and thermal subsystems have grown increasingly
Session Chair: Justin P. Koeln, University of Illinois at Urbana-Champaign
flight critical with each successive generation. Consequently, next gener-
Session Co-Chair: Matthew A. Williams, University of Illinois at Urbana-
ation power and thermal systems must reliably operate under narrower
Champaign
margins to enable electrically and thermally demanding capabilities, such as
directed energy weapons. The ability to narrow these margins is ultimately
A Model Predictive framework for Thermal Management of Aircraft
limited by the ability to guarantee mission objectives despite variations and
Invited session paper. DSCC2015-9771
uncertainty in power and thermal system performance. This paper demon-
Timothy Deppen, Andrew G. Alleyne, University of Illinois at Urbana- strates online prognostic methods applied to a fuel thermal management
Champaign, Urbana, IL, United States, Joel E. Hey, Timothy S. fisher,
Purdue, West Lafayette, IN, United States system. Furthermore, this paper highlights the need for future research to
quantify the effects on mission objectives caused by discrepancies between
The challenge of managing heat dissipation and enforcing operational con- nominal and actual conditions for aircraft designs based on models of highly
straints on temperature within a high- performance tactical aircraft is consid- integrated systems.
ered. For these systems, power density of the electrical equipment and the
Assessment of the Vehicle level Impact for a Sofc Integrated with the
associated thermal loads are quickly outpacing the means of conventional
Power and Thermal Management System of an Air Vehicle
thermal management systems (TMS) to provide on-demand cooling and in
Invited session paper. DSCC2015-9853
order to prevent thermal run away. The next generation of tactical aircraft
is projected to include an order of magnitude greater thermal and electrical rory roberts, j. Mitch Wolff, Sean Nuzum, adam dononvan, Wright State
power magnitudes, and the time scale over which thermal loads will change University, Dayton, OH, United States
is expected to shrink. To meet this rapidly evolving challenge, designing a The demand for electrical power onboard aerospace vehicles continues
TMS for the “worst case” scenario based on a steady-state thermal analysis to grow at an accelerating pace. Accompanied with the electrical power is
will be infeasible. Rather, a holistic systems perspective is needed with new the increase in thermal demands for removing the low quality waste heat
control methodologies that capture and even exploit the transient thermal from the electrical components and advanced electronics. The increase in
behavior. To this end, a model predictive control strategy is presented that thermal demands onboard an aircraft dramatically impact the capability and
utilizes preview of upcoming loads and disturbances to prevent violation of performance of the air vehicle due to the low coefficients of performance
temperature constraints. A simulation case study demonstrates that the pre- (COP) of aerospace refrigeration systems. The low COP means the system
dictive thermal controller can dramatically reduce constraint violations while requires a significant amount of work to lift the thermal waste from the
reducing the work required by the TMS when compared to a cascaded PI aircraft subsystems. This leads to significant demands on the propulsion
feedback controller. system and the power and thermal management systems creating a cycle
A Simulink Pathway for Model-Based Control of Vapor Compression of diminishing returns, which leads to inefficiency and limited capability of
Cycles future air vehicles. Alternative components and configurations have the
Invited session paper. DSCC2015-9830 potential to increase the efficiency of the power and thermal management
system reducing the overall negative impact on air vehicles’ efficiency and
Anhtuan D. ngo, Brandon M. Hencey, Soumya S. Patnaik, Air Force capabilities. A solid oxide fuel cell (SOFC) integrated with the power and
Research Laboratory, Wright Patterson AFB, OH, United States, Joshua R.
Cory, University of Dayton Research Institute, Dayton, OH, United States thermal management system has been investigated. The vehicle level im-
pact of this novel configuration has been assessed along with the dynamic
Current and next generation tactical aircraft face daunting thermal chal- behavior of the SOFC when integrated into these systems. The results pro-
lenges that involve reliably maintaining thermal constraints despite large vide insight into the advantages and disadvantages of the proposed system.
transient loads. Model-based control synthesis has the potential to improve
the performance of a vapor compression cycle system during its transient
operating condition, driven by intermittent and dynamic thermal loads, when
compared to the current heuristic control design technique. However, the
excessive labor and expertise necessary to develop models amenable to
model-based control design techniques has been an impediment to wide-
spread deployment. This paper demonstrates a Simulink pathway for mod-
el-based design via the AFRL Transient Thermal Modeling and Optimization
(ATTMO) toolbox. An effective, simple LQG control design is demonstrated
and opens the door for widespread deployment of many advanced control
techniques.
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