Dynamic Behaviour of a Simplified Gearbox: Study of the Structure-air Cavity Coupling


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Abstract


The main objective of this work is the analysis of vibro-acoustic behaviour of gear-shafts-housing system coupled to an air cavity. The housing is modeled by five rigid faces and an elastic one. The gear pair is modeled by two rigid cylinders connected by an elastic link named time variation mesh stiffness. The shafts are discretized using beam finite elements with two nodes and six d.o.f. by node. The six faces of the housing shut in an air cavity. This study requires the establishment of the functional formulation of the coupled system fluid-structure in term of displacement for the structure and pressure for the fluid. Modal approach, based on the pressure modal decomposition, permits the determination of eigen frequencies and modes of coupling system and the resolution of dynamic equations projected on a reduced modal basis. This model analysis was performed using the STRU finite element program. The equations of motion are integrated in time by using implicit Newmark’s scheme.
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Keywords


Gearbox; Air Cavity; Shell; Plate; Dynamic Behaviour; Spectrum

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References


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