Open Design Optimization Platform (ODOP) - Coil spring design app; mechanical springs; compression spring, extension spring, torsion spring
The Piston Cylinder design type is a small demonstration problem. As a design problem, it is interesting because it illustrates competing objectives. It can be used to show all the main features of the ODOP software including Search, Seek and Trade.
This diagram illustrates the Piston-Cylinder design variables: