Collaborative Optimization Design Of Electrical Hydrostatic Actuator Based On DSDCO

The airborne actuation system is a very important component of the aircraft maneuvering and control system.As the core system of the large aircraft or the advanced fighter,the new Electrical Hydrostatic Actuator(EHA)is not only a basic platform to achieve active control of the aircraft,but also the key technology,which has a significant impact on the development of the next generation of aircraft,and which is in urgent need of breakthrough technology to the domestic advanced aircraft.Therefore,EHA has become the current focus of the research on the new actuation system of the advanced aircraft.The EHA system is a complex typical system of integration of mechanical,electrical,hydraulic and control technology,and its design,which is a complex system engineering with multidisciplinary integration,multi-objective optimization and trade-off among subjects,is essentially a multidisciplinary coupling problem.So the application of modern Multidisciplinary Design Optimization(MDO)to the design of airborne new EHA system can obtain global optimum design through analysis on the impact of various disciplines from the perspective of the system,effectively improve design quality,reduce development costs and product costs and shorten design cycle.An explorative research is carried out on the problem of multidisciplinary design optimization of electrical hydrostatic actuator in this paper,and the specific research contents and research results are as follows:1)The performance of Design Space Decrease Collaborative Optimization(DSDCO)algorithm is analyzed.The main ideas and characteristics of collaborative optimization algorithm are introduced,and the advantages and problems of collaborative optimization algorithm are discussed,and the improvement schemes of the current collaborative optimization algorithm are summarized.A new improved algorithm for collaborative optimization,DSDCO,is introduced,and the performance of this algorithm is analyzed by two representative problems which are the numerical test problem and the gear reducer design problem.The algorithm is insensitive to the initial point and the convexity and concavity of the constraint function,and can obtain the global optimal solution of the optimization problem.2)According to the structural characteristics of EHA,a comprehensive and detailed model of EHA is built based on MATLAB/Simulink and AMESim software platform.The model of the control and electronic system of electrical hydrostatic actuator is built with Simulink,while the model of the hydraulic and mechanical system of electrical hydrostatic actuator is built with AMESim,and the simulation experiment of the multidisciplinary model of EHA is carried out.The results show that the multidisciplinary model of EHA system integrates the features of MATLAB's control modeling facility with the characteristics of AMESim's interdisciplinary and multi-domain modeling,and the model of EHA is reliable,and can be used to guide the optimization design of the system and the realization of the system control algorithm.3)The DSDCO algorithm is used to solve the multidisciplinary design optimization problem of EHA.The discipline of EHA is analyzed,and the EHA is decomposed into the hydraulic and mechanical disciplines,and the constraint equations are established respectively.The mathematical model of the multidisciplinary design optimization of EHA is established,which makes swash plate angle of the piston pump,piston diameter of the piston pump,radius of the pistons distribution circle of the piston pump,piston diameter of the actuator and piston rod diameter of the actuator as design variables,and makes the rapidity of system response as the goal.The DSDCO algorithm and the surrogate model technology are used to solve the optimization problem.Finally,the optimal solution is obtained and the results are verified.Based on electrical hydrostatic actuator,the performance of EHA is optimized by using the DSDCO algorithm.Through the optimization solution,the design variable group,which meets the constraints of each discipline is obtained,and the settling time of the step response of the system reaches the minimum value of 0.1285 s,so that the purpose of fast response has been achieved.The optimization results show that the application of DSDCO algorithm can achieve the purpose of the performance optimization of EHA system.In this paper,the multidisciplinary optimization of EHA is explored,which provides a theoretical reference for the integrated design of the actuator system and at the same time,the application range of multidisciplinary optimization algorithm is extended.It is a work which no one else has done before to design EHA by multidisciplinary collaborative design optimization,so it is of innovative and important practical significance to apply DSDCO algorithm to multidisciplinary design optimization of the EHA system,which is a complex typical system with mechanical,electrical and hydraulic technology.