Hopsan

Ssimulation environment for fluid and mechatronic systems Hopsan is a free simulation environment for fluid and mechatronic systems, developed at Linköping University. Although originally developed for simulation of fluid power systems, it has also been adopted for other domains such as electric power, flight dynamics, and vehicle dynamics. It uses bi-directional delay lines (or transmission line elements) to connect different components. History The development on Hopsan first began in 1977 at the Division of Hydraulics and Pneumatics at Linköping University. The first version was written in FORTRAN, with a drag-and-drop graphical user interface written in Visual Basic. In addition to the simulation capability it also had features for simulation based optimization. This used the COMPLEX direct search optimization method or a generic algorithm (GA). It also had features for frequency analysis and transfer function analysis, on simulated results. It also supported co-simulation under Simulink. Component models were written as FORTRAN subroutines. A separate tool called COMPGEN, written in Mathematica, was also developed, which can be used to generate component models in a more str