Abstract
During the last few years, the concept of more-electric aircraft has been pushed ahead by industry and academics. For a more-electric actuation system, the electrohydrostatic actuator (EHA) has shown its potential for better reliability, low maintenance cost and reducing aircraft weight. Designing an EHA for aviation applications is a hard task, which should balance several inconsistent objectives simultaneously, such as weight, stiffness and power consumption. This work presents a method to obtain the optimal EHA, which combines multi-objective optimization with a synthetic decision method, that is, a multi-objective optimization design method, that can combine designers’ preferences and experiences. The evaluation model of an EHA in terms of weight, stiffness and power consumption is studied in the first section. Then, a multi-objective particle swarm optimization (MOPSO) algorithm is introduced to obtain the Pareto front, and an analytic hierarchy process (AHP) is applied to help find the optimal design in the Pareto front. A demo of an EHA design illustrates the feasibility of the proposed method.
Highlights
With the rapid development of aeronautical science and technology, power-by-wire actuation systems will replace traditional hydraulic actuation systems gradually [1]
As electrohydrostatic actuator (EHA) can improve the viability and reliability of aircraft, this brings down the cost of maintenance
The expression of an objective indicates that there are lots of parameters that should be determined in EHA design
Summary
With the rapid development of aeronautical science and technology, power-by-wire actuation systems will replace traditional hydraulic actuation systems gradually [1]. In power-by-wire actuation systems [2], power transfers from a secondary power system to actuators by means of electric power transmission. The power-by-wire technology causes the centralized hydraulic system to be cancelled or reduced, which means the reliability and maintainability will be increased and the weight will be decreased greatly. In current power-by-wire actuation systems, EHAs attract more and more attention because of their characteristics of small size and high power density [3]. As EHAs can improve the viability and reliability of aircraft, this brings down the cost of maintenance. The use of EHAs can improve the performance of the aircraft, and reduce the maintenance cost [4]
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