Research on Structure Influence of Sectional Valve Base on the Power Bond Graph Model

doi:10.3901/JME.2025.10.414

Abstract

Abstract: Load-sensing sectional valves are widely used in the hydraulic systems of construction machinery and ground equipment for national defense. The dynamic performance of sectional valves is the key factor restricting the controllability and control accuracy of the machinery. In order to study the influence of the structural parameters of sectional valves on the dynamic response characteristics of the main valve, based on the typical electro-hydraulic pilot-controlled sectional valve structure, a mathematical model of the sectional valve system was built, and the state space equation of the system was derived. The first-order sensitivity analysis method was used to study the key structural parameters affecting the dynamic characteristics of the sectional valve and their influence weights. To verify the correctness of the theoretical analysis, an experimental platform for testing the sensitivity data of the sectional valve was built. The three parameter variables including spring stiffness of the fixed differential relief valve, the spring stiffness of the fixed differential pressure reducing valve, and the liquid volume of the outlet of the fixed differential pressure reducing valve were experimentally verified based on the analogy method, The experimental results were consistent with the simulation conclusions, and obtained that the factors affecting the dynamic characteristics of the sectional valve from largest to smallest are： the pressure-bearing area of the fixed differential pressure reducing valve, the spring stiffness of the fixed differential pressure reducing valve, the liquid volume of the outlet of the fixed differential pressure reducing valve, the liquid volume of the pump and the inlet pipe of the sectional valve, and the spring stiffness of the fixed differential relief valve spring.

Key words: load sensing sectional valve, power bond diagram, first-order sensitivity, dynamic response

CLC Number:

TP604

SUN Ruihui, XU Bing, ZHANG Junhui, SU Qi. Research on Structure Influence of Sectional Valve Base on the Power Bond Graph Model[J]. Journal of Mechanical Engineering, 2025, 61(10): 414-426.

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