Multi-body dynamics
Multi-Body Dynamics analysis is used to optimize geometry of individual parts. This analysis consists of complex stress calculations to compute effects on multiple components of the jaqEngine. The multi-body dynamics analysis is conducted with Altair's software tool Hyperworks/MotionSolve.
Output from the numerical simulation conducted in Matlab provided data of real-time pressures in the combustion chambers during the combustion cycle. These pressures where then used to examine inflicted forces on the engines pistons and resulting stress and deformation of individual components.
This multi-body dynamics analysis makes it possible to analyse moving parts rather then static components. All moving parts are designated flex-bodies which means the components have finite strength and stiffness.
Topology optimization
One of the most critical parts of the engine, the wobbledisk is examined with Optistruct/Hyperworks. This tool was used to reduce material stress as well as the components mass which has led to a optimal shape and construction of the disk. As a result the disk is now constructed with roughly 50% less mass compared to the original design while strain and stress on the component remain well within safety limits considering material properties.
