Title: Thermal-Dynamic Investigation of Advanced System Control Strategies for Decentralized Electro-Hydraulic Power Generation in More Electric Aircraft
Language: English
Authors: Trochelmann, Nils 
Thielecke, Frank 
Metzler, Dirk 
Duval, Marcelo 
Kirchmann, Ingrid 
Issue Date: 2020
Source: Aerospace Europe Conference (AEC 2020)
Abstract (english): 
Decentralized electro-hydraulic (eH) system architectures, formed by a number of zonal systems, are a promising intermediate step between today’s central hydraulic systems and all electric actuation. Zonal eH systems supply hydraulic power to specific aircraft zones and allow proven hydraulic actuation technology to be retained. The decentralized architecture offers several advantages over state of the art centralized aircraft hydraulic systems: power on demand with high efficiency, system (pre-) integration, reduced installation effort, less hydraulic piping, and mitigation of cascaded effects of external leakage. A main challenge of a decentralized architecture is the increased system weight and higher system complexity resulting particularly from the need for (at least) one separate eH power generation module per zonal system. In addition, thermal loading may increase significantly due to less cooling caused by shorter pipe lengths.

Advanced eH system control strategies have great potential to reduce system mass and thermal loading by increasing system efficiency. Due to varying numbers, types, installation locations, and duty cycles of allocated consumers, the zonal systems require individual solutions. This paper develops advanced eH system control strategies for two exemplary zonal systems of a representative MEA scenario. The concepts are investigated in thermal-dynamic simulations of specific test vectors. The first system supplies flight control actuators under continuous duty with a moderate average demand. A variable pressure control philosophy based on an eH load sensing scheme leads to considerable reduction of thermal loading and could avoid a complex cooling system. The second system provides a large amount of hydraulic power on demand to landing gear and high lift system motors. An advanced pump controlled operating strategy is shown to enable significant downsizing potential for the power generation module and to smoothen the operating profiles.
Conference: Aerospace Europe Conference, AEC 2020 
URI: http://hdl.handle.net/11420/8421
Institute: Flugzeug-Systemtechnik M-7 
Document Type: Chapter/Article (Proceedings)
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