|Friction Characteristics of a Cylinder Based on a Bridge-Type Pneumatic Energy-saving Circuit
Hongwang Du, Wei Xiong*, Zhong’ai Jiang, Qiu Li, and Lu Wang
International Journal of Control, Automation, and Systems, vol. 17, no. 1, pp.145-154, 2019
Abstract : "A bridge-type energy-saving circuit is a new type of pneumatic system that uses four on-off valves to
control the inlet and exhaust of two cylinder chambers. It saves energy through the open-and-close sequence of the
four control valves. Cylinder friction is the key factor in accuracy and stability of the bridge-type pneumatic energysaving
circuit. This paper focuses on research of the circuit’s friction characteristics. Based on friction theory and
the classic Stribeck model, a composite dynamic friction model of a cylinder in a circuit system is established, and
a cylinder friction test platform is constructed. The Nelder-Mead algorithm is used to identify static parameters
of the model through the relationship between friction and velocity while the piston is moving. Friction model
verification with error analysis is achieved by comparison with the traditional friction model. Experiments with
the energy-saving circuit under certain conditions are carried out to illustrate the effectiveness of the composite
dynamic friction model. Finally, compared with existing friction model, the validity of the model is proved to be
applicable to different working conditions."
"Bridge-type pneumatic energy-saving circuit, composite dynamic friction model, cylinder friction, parameter identification."