20-sim is an advanced modeling and simulation package for Windows from the same laboratory as Tutsim. With 20-sim you can simulate the behavior of dynamic systems, such as electrical, mechanical, thermal and hydraulic systems and any combination of these. 20-sim models may consist of iconic diagrams, bond graphs, block diagrams as well as differential equations. It is used in mechatronics, control engineering, robotics, mechanical engineering, signal processing, hydraulics, etc. The 20-sim Viewer is a free full version, it has the complete library of submodels and all toolboxes (like 3D animation, FFT, controller design, bode plots, state spaces, etc).
More info:
hxxp://www.20sim.com/index.html
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