A Coupled Fluid-Structure Simulation for Variable Displacement Pump Used in Vehicle

The defects of constant displacement pumps hinder the modern vehicle to achieve its energy saving goals. Variable displacement pump is becoming the focus of research and development. In the paper, the displacement adjusting mechanism in the pump is treated as a rigid, and its motion leads to a continuously deforming and moving fluid domain. ALE method is used in CFD to overcome the difficulties of the fluid-structure interaction exists in the variable displacement pump. The moving regularity of computing grid and the boundary conditions of the ALE method are reasonably specified, to minimize the computing complexity in the coupled analysis. Experiments on prototype prove the performance of the pump in flow rate and energy saving. The results of analysis agree well with the experimental data, and the motion of the displacement adjusting mechanism is analyzed accurately.

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Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1177/0959651820973898 ◽

2020 ◽

pp. 095965182097389

Author(s):

Samir Kumar Hati ◽

Nimai Pada Mandal ◽

Dipankar Sanyal

Keyword(s):

Energy Saving ◽

Absolute Error ◽

Fast Response ◽

Maximum Energy ◽

Radial Clearance ◽

Simulation Based Design ◽

Simulation Based ◽

Displacement Pump ◽

Variable Displacement ◽

Axial Piston

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

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Energy Saving Strategy of the Variable-Speed Variable-Displacement Pump Unit Based on Neural Network

Procedia CIRP ◽

10.1016/j.procir.2019.01.108 ◽

2019 ◽

Vol 80 ◽

pp. 84-88 ◽

Cited By ~ 1

Author(s):

Rui Jin ◽

Haihong Huang ◽

Lei Li ◽

Libin Zhu ◽

Zhifeng Liu

Keyword(s):

Neural Network ◽

Energy Saving ◽

Variable Speed ◽

Pump Unit ◽

Displacement Pump ◽

Variable Displacement

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Fluid-structure coupled analysis of tandem 2D elastic panels

Aerospace Science and Technology ◽

10.1016/j.ast.2021.106521 ◽

2021 ◽

Vol 111 ◽

pp. 106521

Author(s):

Hao Zhou ◽

Gang Wang ◽

Haris Hameed Mian ◽

Mengzhu Qin

Keyword(s):

Coupled Analysis ◽

Fluid Structure

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Robust Nonlinear Control of a Novel Indexing Valve Plate Pump: Simulation Studies

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.1514668 ◽

2002 ◽

Vol 124 (4) ◽

pp. 613-616 ◽

Cited By ~ 2

Author(s):

X. Zhang ◽

S. S. Nair ◽

N. D. Manring

Keyword(s):

Pressure Control ◽

Plate Motion ◽

Nonlinear Simulation ◽

Response Characteristics ◽

Model Free ◽

Swash Plate ◽

Displacement Pump ◽

Variable Displacement ◽

Robust Adaptive ◽

Improved Performance

A robust adaptive pressure control strategy is proposed for a novel indexing variable-displacement pump. In the proposed approach, parametric uncertainties and unmodeled dynamics are identified to the extent possible using a model free learning network and used to decouple the dynamics using physical insights derived from careful reduced order modeling. The swash plate motion control is then carefully designed to provide the desired pressure response characteristics showing improved performance with learning. The proposed control framework and designs are validated using a detailed nonlinear simulation model.

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