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Investigation into the Vibration Reduction of the Flow-amplifier Type Steering Hydraulic System on Loader

Author: TanZhengSheng
Tutor: JiHong
School: Lanzhou University of Technology
Course: Mechanical and Electronic Engineering
Keywords: Loaders Hydraulic steering system Vibration Control Flow amplifying valve Throttling grooves Valve port
CLC: TP271.31
Type: Master's thesis
Year: 2009
Downloads: 135
Quote: 7
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Abstract


Hydraulic steering system is one of the most important system in the loader, it directly affects the safety of the whole machine, operating efficiency, energy consumption and operating comfort. In this paper, the theoretical analysis, numerical simulation and experimental analysis of a combination of research methods, conducted in-depth research, proposed a flow amplifying valve port steering vibration problems in the hydraulic system for large wheel loaders flow amplification type optimized damping. Numerical calculation and test results show that the new flow amplifying valve hydraulic steering system with excellent damping effect, proportional control characteristics and operating comfort, and has a certain energy-saving effect. The main contents are as follows: Chapter 1 of the background and significance of this research; Overview wheel loaders at home and abroad hydraulic steering system status and existing problems; summarized the main contents of this paper. Chapter 2 analyzes the two pilot supply, loaders flow amplified steering hydraulic system characteristics and existing problems, and proposed solutions. By in-depth analysis of the traffic amplification type hydraulic steering system vibration mechanism, based flow amplification optimized damping valve port. Chapter 3, the flow amplifying valve of the valve port area, a numerical analysis to obtain the characteristic curve of the valve port area, the flow amplifying valve area magnification \The calculation results show that the new flow amplifying valve pilot valve orifice area curve and area magnification monotonicity and linearity. Chapter 4, flow amplifying valve internal flow field of numerical analysis. The calculation results show that the same conditions of new traffic to enlarge the Fazhu heart valve by the axial force and lateral force are small, start acceleration decreases the effective control of the hydraulic steering system pediment vibration. Chapter 5, the establishment of a mathematical model of the movement of the main valve core reset, its numerical calculation using MATLAB / Simulink software, analyze the impact of various factors on the return movement of the main valve core. The results show that only about 1/4 of the reset time the initial segment of the heart reset movement of the main valve fast, completed 88.5% of the return stroke, followed by a slow close to the median; pilot valve orifice area affect the reset speed most major factor. Chapter 6, flow amplification type hydraulic steering system for the real vehicle test studies. The test results show that the new flow amplifying valve having excellent vibration damping effect and improve the operating comfort and steering system of the proportional control characteristics, and having a certain amount of the energy-saving effect. Finally, a summary of the work and achievements of this thesis and looking forward to the next step in the research work.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > General Automation System > Fluid Systems > Hydraulic system
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