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Abstract: The researching history of pneumatic positioning system is
overviewed, and the researching work on characteristics study,
developing control valve and control strategy are summarized. The past
work shows that the gas flow through a valve and tube is complex, the
thermodynamic process in a cylinder chamber is a polytropic process with
varying polytropic exponent and the friction force varies while the
velocity of the cylinder and the pressures in the two chambers of the
cylinder change. After the control valves are developed, the control
strategies coped with different kinds of characteristics of the system
are promoted, such as nonlinearity compensation strategy, dithering
compensation, robust control and same pace PWM. After about 20 years
researching, the pneumatic positioning systems now have performances
good enough to meet the requests of the manufacturing system.
Key words: Pneumatic positioning system Basic characteristics
Control strategy
Research
development
CLC No: TH271.32
纪念《机械工程学报》创刊50周年——“机械工程技术的历史、进展与展望”主题征文.
Received 20031024, received in revised form 20031107
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