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Dynamic contaminated particles concentration-based degradation model of linear electro-hydrostatic actuator

The paper proposes a performance degradation analysis model based on dynamic erosion wear for novel Linear Electro-Hydraulic Actuator (LEHA). The Computational Fluid Dynamics (CFD) method, combining with turbulent theory and micro erosion principle, is used to establish an erosien model of rectification mechanism. The erosion rate of different port opening size under time-varying flow field was obtained. By piecewise linearization method, we updated the concentration of contaminated particles within LEHA and gained the structure erosion degradation process at the different stages of degradation. The innovation of our model is using dynamic contaminated particles concentration, while static particles concentration in erosion analysis for Electrohydraulic Servo Valve (EHSV), throttle valve, spool valve, needle valve published in the previous literatures. The approach can be used to evaluate the service life of LEHA, further to guide the design of LEHA's rectification valve structure. Our efforts can make LEHA more resistant to erosion.