Nonlinear flow modeling of electro hydrostatic pump unit based on Gauss Newton iterative method for high performance...

Area of Science:

• Control Systems Engineering
• Fluid Power Systems
• Nonlinear Dynamics

Background:

• Nonlinear flow modeling in electric hydrostatic pump units (EPUs) is critical for high-performance operation in electro-hydraulic servo pump control systems (EHSPCS).
• Current linearization methods with compensation for EPU nonlinear flow are limited by reliance on deviation correction.
• Achieving precise position control in EPUs necessitates accurate modeling of their complex flow dynamics.

Purpose of the Study:

• To develop a precise nonlinear flow model for EPUs using the Gauss-Newton iterative method.
• To establish the mapping relationship between load flow and operating parameters within the EPU.
• To directly enhance the control performance of EPUs, particularly in position control applications.

Main Methods:

• Utilized the Gauss-Newton iterative method for nonlinear flow modeling of the EPU.
• Collected test data from various operating conditions to build the nonlinear flow model.
• Derived the mapping relationship between load flow and operating parameters based on the model.

Main Results:

• A validated nonlinear flow model for EPUs was successfully developed.
• The Gauss-Newton method demonstrated high accuracy in modeling EPU nonlinear flow.
• The proposed model significantly improved control performance compared to existing methods.

Conclusions:

• The Gauss-Newton iterative method provides an accurate and practical approach for nonlinear flow modeling in EPUs.
• The developed model effectively captures the complex flow dynamics, leading to improved control performance.
• This research offers a pathway to enhanced precision in position control for EHSPCS.