Modelling and Simulation of Dynamic Processes of Pneumatic Lines

Abstract

The paper presents the simulation of dynamic processes of pneumatic lines using the program "SIMULINK" from the product " MatLab". Simulation is a process of forming, preparing and entering a mathematical model in a computational environment and obtaining the results of the calculations performed in this environment. The mathematical model of the pneumatic line to be simulated is according to previously presented equations. For the simulation of the dynamic processes, various real parameters of the dimensions and lengths of the pneumatic lines with the corresponding coefficients are introduced into the model. The simulation of the transient responses was carried out with stepwise variation and sinusoidal input signal supplied by the set point device and pneumatic line lengths of 1 m, 5 m and 10 m. The simulation output data were output to the interface in the form of graphs showing the dependence of the observed quantities, the input and output pressure through the pneumatic line, and the input and output flow rates. From the mathematical model and the experiments performed, it can be concluded that the transient responses in the simulations correspond to the dynamic processes of pneumatic lines of different lengths.

Experimental Study of the Frequency Responses of Electropneumatic Positioning System

“…But at high frequency, the pneumatic cylinder can no longer follow the variations of the input signal and its oscillation amplitude is reduced. The frequency at which this starts to happen is the critical frequency [2,6].…”

“…Due to the compressibility of air, unfavourable friction characteristics and little damping, pneumatic devices require complex control. But they also offer advantages such as: the compressibility of air provides damping of impact loads, which is important in many technical applications [1][2][3][4][5] in which electropneumatic positioning systems are applied. This imposes strict requirements related to their operation in static and dynamic modes.…”