The simulation of time-varying flow in fluid transmission lines can be based on a modal approximation of the frequency domain irrational transfer matrix. The obtained rational approximation can be used in variable time step simulators to evaluate the influence of the line on fluid servosystems dynamics. In this work the application of a numerical approximation technique (Vector Fitting) is proposed, with particular attention to physical causality, stability and passivity of the model. This approach is applied to the study of pressure transients in pneumatic lines. Simulation results are compared with results furnished by Pichè and Ellman’s variational method and with experimental data obtained on test bench, showing a good agreement.

Modal Approximation Time-Domain Models for Pneumatic Transmission Lines / Almondo, A.; Franco, Walter; Sorli, Massimo. - (2005). ((Intervento presentato al convegno The Ninth Scandinavian International Conference on Fluid Power, SICFP'05, Linköping, Sweden tenutosi a Linköping, Sweden nel June 1-3, 2005.

Modal Approximation Time-Domain Models for Pneumatic Transmission Lines

FRANCO, WALTER;SORLI, Massimo
2005

Abstract

The simulation of time-varying flow in fluid transmission lines can be based on a modal approximation of the frequency domain irrational transfer matrix. The obtained rational approximation can be used in variable time step simulators to evaluate the influence of the line on fluid servosystems dynamics. In this work the application of a numerical approximation technique (Vector Fitting) is proposed, with particular attention to physical causality, stability and passivity of the model. This approach is applied to the study of pressure transients in pneumatic lines. Simulation results are compared with results furnished by Pichè and Ellman’s variational method and with experimental data obtained on test bench, showing a good agreement.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1411710
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