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Skid steer loader working device damping system design and research

Author: LuJiangBin
Tutor: LiuBo
School: Central South University
Course: Mechanical and Electronic Engineering
Keywords: Skid steer loader Vibration Control Technology Oil and gas damping system The road surface model Semi- active vibration fuzzy control Matlab-Simulink simulation
CLC: TH243
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 0
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Abstract

Skid steer loader used in infrastructure construction as a frequent need to carry out the the job transitions engineering vehicle, ride comfort of the working device in transport operations process become the key to maintain the integrity of the bucket materials and improve work efficiency. The this article skid steer loader ZHL3210 for the study, theoretical, simulation and experimental study of ride comfort improvement for the working device. Mainly to the completion of the work are as follows: 1 discussed vibration control technology and engineering vehicles at home and abroad damping technology research status quo, based on the operating characteristics of skid steer loaders, transport conditions working device vibration in clear the the main excitation factors and vibration transfer process on the basis of proposed based on the semi-active oil and gas damping program to change the damping device, and the establishment of the the working device oil and gas damping system. 2, based on the analysis of the oil and gas damping system, the establishment of a mathematical model of the system is derived on the basis of the characteristics and damping characteristics of the nonlinear stiffness of the damping system, the main structural parameters affect the performance of the system damping is obtained the initial inflation pressure of the accumulator, the volume of the initial inflation, the proportional throttle valve opening degree of the valve port and one-way throttle valve through-flow cross-sectional area, and through the programmed operation of the output characteristics, the analysis of the principles of the system damping . 3, based on the principles and output damping system stiffness and damping characteristics, building joining damping system, the physical model of the machine vibration system and applications the Lagrange equation method to establish the dynamic mathematical model of the vibration system; according to the characteristics of the operating environment, type of D-level random engineering road model and the impact of the special conditions of the conventional conditions lateral railway track pavement model as vibration excitation input. 4, according to the the vibration system dynamics model, the application of Matlab-Simulink simulation software analysis of the main parameters of the damping system investigated ride comfort working device; to D level engineering pavement system conditions simulation analysis, the resulting oil and gas based on the kinetic parameters of the damping system to determine the system structure parameters and component selection; traveling ride of simulation based on the determination of the parameters of the damping system, the work unit in the D-class road and rail traffic, and show that the D-level traffic under damping system can well meet the requirements of ride, but the rail road conditions, poor isolation effect, the proposed design for a road fixed parameters damping system defects. Changeable and complexity for the lack of fixed parameters damping system and the actual transport conditions pavement, using a semi-active damping control method based on fuzzy control, combined with semi-active vibration fuzzy control system dynamics modeling system and application MATLAB-Fuzzy toolbox to design a fuzzy controller; segmentation based on random road and rail traffic, road surface model without damping system was evaluated by simulation, adding damping system of fixed parameters and the fuzzy control semi-active damping system for ride comfort working device, and verify the effectiveness of the semi-active vibration fuzzy control scheme. To ZHL3210 skid steer loader as a platform for the real vehicle test, to verify the validity of the vibration control of the oil and gas damping system working device, the correctness of the damping system and vehicle vibration system mathematical model, based on changing the system damping The reasonableness of the semi-active damping control program.

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