Finite element analysis of radial stress distribution on axisymmetric variable thickness Dual Mass Flywheel using ANSYS.

Abstract

Flywheels are applied in storing inertial energy in rotating machine engines and to limit speed fluctuations. In Dual Mass flywheel (DMF) the rotating mass is split into two and is joined by a damping mechanism. It is commonly in hardest use during engine start up and shut down. In flywheel design, important aspects to consider include geometry (cross-section), rotational speed and material strength. Also, to consider is the mass moment of inertia which when too much the system will be sluggish and unresponsive whereas when too little the system would lose momentum over time. The material strength directly determines the energy level that can be produced safely when coupled with rotor speed. This together with rotational speed result to the flywheel being very highly stressed hence necessary to determine stresses accurately using a discrete method as provided for by ANSYS software. During shaft rotation, centrifugal forces generate stresses in the circumferential as well as radial directions. This paper describes studies on the analysis of axisymmetric solid DMF geometry under radial stress distribution at high revolution using ANSYS. Finally, a discussion of the generated results which would be applied in modifications of existing structures for improved new operating service conditions and academic instruction.

Keywords: DMF, radial stress, FEA analysis, axisymmetric load.