| At present,the integrated electro-hydraulic actuator is one of the most popular type of new airborne actuators at home and abroad.The applications of intelligent materials give some new ideas for the design of the electro-hydraulic actuator in characteristics of small-scale,integrated and large flow.Therefore,a dual magnetostrictive axial plunger pumps-based electro-hydrostatic actuator（DMAEHA）is proposed in this paper.First of all,in this paper,the principle of bidirectional and continuous output displacement of DMAEHA is designed innovatively.Based on the principle mentioned above,a new type of active rectification valve with distributed by end face is designed,and two magnetostrictive axial plunger pumps are used as the core power components.The principle of motion matching relationship between the active rectification valve and the two magnetostrictive axial plunger pumps is designed and explained,and the design criteria of the active rectification valve in each structure of different orifices are analyzed theoretically.Secondly,on the basis of the structural design of DMAEHA,the influence of the oil pressure loss under different structural dimensions of the active rectification valve’s oil port and orifice is researched with the aid of CFD analysis software.The structural dimensions analyzed above are optimized,and the theoretical research on the structural design of the active valve is perfected.Further,in order to explore the actuator mechanisms and output properties,the mathematical model of DMAEHA is built in MATLAB/Simulink,including the driving model and internal oil flow characteristic model of two magnetostrictive plunger pumps,the oil flow characteristic model in the active valve,the pipeline pressure loss model and the dynamics model of the hydraulic cylinder.The mathematical model can accurately describe the output properties of DMAEHA,and verify that DMAEHA can output bidirectional and continuous displacement.The simulation results show that the phase change of the driving signal has a great influence on the flow output of DMAEHA.The output flow of DMAEHA will increase with the increase of the frequency of driving signal,and when the frequency exceeds 180 Hz,the output flow will decrease with the increase of the driving frequency.The peak output flow of the actuator will decrease with the increase of the length of the pipeline.Finally,the experimental prototype is processed,and the experimental test platform is built.The output properties of the actuator under no-load and load conditions is tested,and compared with the simulation results of the mathematical model.The experimental results are in good agreement with the simulation results of the mathematical model.The experimental results show that the change of the driving signal phase will change the output flow of DMAEHA regularly.Under no-load condition,the maximum output flow of the actuator appears when the driving frequency is 180 Hz,which is 2.69L?min-1;under load condition,the maximum output flow of the actuator also appears at 180 Hz.The maximum carrying capacity of the system is about 52 kg.The main innovation of this paper:Based on the previous research on the radial arragement of magnetostrictive plunger pumps in our laboratory,an electro-hydrostatic actuator driven by double magnetostrictive plunger pump with axial arragement is proposed,and a new type of active rectification valve is designed.The new active rectification valve reduces the moment of inertia of the valve spool and the oil volume in the valve body.It improves the output frequency and output flow of the actuator,and reduces the number of sealing surfaces of the valve spool,so as to reduce the leakage of the oil.The single face valve structure reduces the space occupied by the actuator,and it is easier to realize the extended arrangement of the magnetostrictive plunger pump to achieve higher flow output.The experimental results show that the peak output flow rate and its corresponding frequency increase compared with the previous radial arragement. |
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