A bridge-type energy-saving circuit is a new type of pneumatic system that uses four on-off valves tocontrol the inlet and exhaust of two cylinder chambers. It saves energy through the open-and-close sequence of thefour control valves. Cylinder friction is the key factor in accuracy and stability of the bridge-type pneumatic energysavingcircuit. This paper focuses on research of the circuit’s friction characteristics. Based on friction theory andthe classic Stribeck model, a composite dynamic friction model of a cylinder in a circuit system is established, anda cylinder friction test platform is constructed. The Nelder-Mead algorithm is used to identify static parametersof the model through the relationship between friction and velocity while the piston is moving. Friction modelverification with error analysis is achieved by comparison with the traditional friction model. Experiments withthe energy-saving circuit under certain conditions are carried out to illustrate the effectiveness of the compositedynamic friction model. Finally, compared with existing friction model, the validity of the model is proved to beapplicable to different working conditions.
A bridge-type energy-saving circuit is a new type of pneumatic system that uses four on-off valves tocontrol the inlet and exhaust of two cylinder chambers. It saves energy through the open-and-close sequence of thefour control valves. Cylinder friction is the key factor in accuracy and stability of the bridge-type pneumatic energysavingcircuit. This paper focuses on research of the circuit’s friction characteristics. Based on friction theory andthe classic Stribeck model, a composite dynamic friction model of a cylinder in a circuit system is established, anda cylinder friction test platform is constructed. The Nelder-Mead algorithm is used to identify static parametersof the model through the relationship between friction and velocity while the piston is moving. Friction modelverification with error analysis is achieved by comparison with the traditional friction model. Experiments withthe energy-saving circuit under certain conditions are carried out to illustrate the effectiveness of the compositedynamic friction model. Finally, compared with existing friction model, the validity of the model is proved to beapplicable to different working conditions.