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Research Papers

Modeling, Experimentation, and Simulation of an Air-Over-Hydraulic Brake System

[+] Author and Article Information
Xicheng Xiong, Jianhua Wei, Jian Chen

State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

J. Dyn. Sys., Meas., Control 131(3), 031013 (Mar 23, 2009) (9 pages) doi:10.1115/1.3089563 History: Received June 07, 2007; Revised February 04, 2009; Published March 23, 2009

This paper deals with the development and validation of an analytical dynamic model of an air-over-hydraulic (AOH) brake system that is widely used on loaders. The AOH system is broken into five simple and cascaded subsystems, pneumatic circuit, air-hydraulic actuator, brake line, wheel cylinder, and disk brake. Pneumatic, hydraulic, and mechanical dynamics are taken care of in each subsystem. The determination of model coefficients is introduced in detail. Many experiments are performed on an experimental setup of the real AOH system on a loader and the experimental data are compared with the simulation results. Preliminary analysis shows that the simulation results are in good agreement with the experimental data. Other researchers in the areas of brake systems in construction machinery would find the model useful for similar system modeling and analysis

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A general layout of the AOH brake system on loaders

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Figure 2

Curve of the effective area Ae

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Figure 3

Schematic of the air/hydraulic actuator

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Figure 4

A simplified model of hard stop

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Figure 5

Orifice of the actuator

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Figure 6

Schematic of the brake lines

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Figure 7

Flow rate of the brake lines

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Figure 8

Schematic of the wheel cylinder and disk brake

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Figure 9

Pressure transients of air chamber on pressing

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Figure 10

Pressure transients of fluid chamber and air chamber on pressing

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Figure 11

Pressure transients of wheel cylinder and air chamber on pressing

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Figure 12

Pressure transients of wheel cylinder and fluid chamber on pressing

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Figure 13

Pressure transients of air chamber on a cycle

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Figure 14

Pressure transients of air chamber and fluid chamber on a cycle

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Figure 15

Pressure transients of wheel cylinder and air chamber on a cycle

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Figure 16

Pressure transients of wheel cylinder and fluid chamber on a cycle

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