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Article | REF: BM6113 V1

Transmissions of pneumatic power - Electropneumatic power modulators

Author: Daniel HUBERT

Publication date: July 10, 2009 | Lire en français

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    3. Characteristics of an electro-pneumatic power modulator

    3.1 Compressible fluid flow laws

    An electro-pneumatic power modulator controls gas energy transfer by driving variable-area orifices.

    For compressible fluids, the mass flow through each passage section is a function of the pressures upstream and downstream of the section in question. ISO 6358-1989 proposes a mathematical approximation of the laws of flow through a fixed restriction using two parameters:

    • the sonic conductance C, expressed in m 3 · s –1 · Pa –1 , the image of the effective cross-sectional area of the component determined in the sonic regime;

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