Abstract:Piston accumulators are commonly used in the aerospace electro-hydraulic servo systems to reduce the power demand on oil sources during instantaneous high-power actuation. At present, there is no design standard for the piston diameter of piston accumulators. An inappropriate piston diameter directly affects the structural design and service performance of the accumulator. Meanwhile, the application of new materials significantly reduces the overall weight of the accumulator. To evaluate the influence degree of piston diameter and its weight on the energy supply performance of the accumulators, this paper takes a certain type of aerospace piston hydraulic accumulator as the research object, establishes an evaluation model for the energy supply performance of the accumulators, obtains the mapping relationship between piston diameter and its weight through the numerical fitting method, and analyzes the influence laws of piston weight, seal damping and piston diameter on the energy supply performance of the accumulators. The results show that piston weight has almost no influence on the energy supply performance of the accumulators, while piston diameter and seal damping are the key parameters affecting the energy supply performance of the accumulators. Finally, this paper puts forward suggestions on the selection of an appropriate piston diameter for the accumulators.