Title: Modelling and performance analysis of designed energy-efficient EHA under gravity loads

Authors: Lijing Dong; Hao Yan; Lijun Feng; Qifan Tan

Addresses: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China ' School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China

Abstract: Electro-hydrostatic actuators (EHA) are highly resembled hydraulic actuators. For specific applications under gravity loads, an innovative structure of EHA using double variable pump and accumulators with designated pressures specified is proposed. The motor speed and the pump displacement can be adjusted synchronously to provide necessary flow. Consequently, inherent nonlinearity of the two inputs in a multiplication form is involved. Based on analysis of the working principle of the designed EHA, the nonlinear mathematical model precisely describing the multiplication of two coupled inputs is established. The designed EHA balances part of the gravity loads with accumulators, overwhelmingly inducing the energy consumption. Through analysing with reliable and professional hydraulic simulation tool AMESim, the energy saving performance is demonstrated quantitatively.

Keywords: electro-hydrostatic actuators; EHA; energy efficient; gravity heavy loads; mathematical modelling.

DOI: 10.1504/IJMIC.2018.095831

International Journal of Modelling, Identification and Control, 2018 Vol.30 No.4, pp.253 - 260

Available online: 17 Oct 2018 *

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