Identification of viscous friction coefficients for a pneumatic system model using optimization methods

Modeling and experiment of pneumatic position system with spring-and-diaphragm actuator

“…The valves in this application are on/off digital valves with piezoelectric technique driven by PWM. The thermodynamic equations for valves modeling are based on those shown in literature [3] for gas through a nozzle. They can be represented by the following equations:…”

“…A large number of researchers have tried modeling the pneumatic position system with piston actuator. Up to date, the full non-linear model without any linearization and without designing any control strategy in a closed-loop sense is obtained [1,2] ; the unknown parameter is estimated by means of non-linear optimization algorithms [3,4] . For the actuator controlled by PWM, the modeling is done in an average sense [5,6] .…”

Tribological property investigation on a novel pneumatic actuator with integrated piezo actuators

“…Pneumatic technology is widely applied in automation and robotics [1][2][3][4] due to its high force, relatively low manufacturing cost, clean operating conditions and high reliability [5][6][7]. The seal technology used in these devices plays an essential role in the overall actuator performance.…”

Valve's dynamic damping characteristics — Measurement and identification

“…Some papers investigate friction characteristics of valves, and present their friction testing systems [1]- [3]. Most of them obtain the friction characteristics of the valve by a system, in which an actuator drives the testing valve to move.…”