Iulian LUPEA


In the present paper a one dimensional fluid-structure coupling system is under observation. The system is composed of two coupled subsystems. The first one is a structural mass - spring - damper and the second one is a tube filled with air with a piston which represents the mass of the first subsystem.  The solutions of a derived transcendental equation stand for the natural frequencies of the structure−air coupled system. The natural frequencies of both uncoupled subsystems are observed graphically in parallel to the natural frequencies of the coupled system. The coupled system’s natural frequencies are discussed in function of the value of the unique structural natural frequency relative to the natural frequencies of the air filling the tube.

Keywords: fluid-structure coupling system, natural frequency, transcendental equation.

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