Amesim fluid-power modeling and simulation software from Imagine Software Inc., Southfield, Mich., helps model fluid-power systems in cars, construction and material-handling equipment, and aerospace vehicles. The software can model fuel-injection systems, engine thermal management, gearboxes, braking, power-steering, suspension systems, and valve-train dynamics. Unlike general-purpose modeling packages, Amesim is one-dimensional, focusing on fluid-power physics and technical issues. The software has also been configured to analyze and solve hydraulic and pneumatic problems. Virtual prototypes are built and simulations run in just four steps. The software runs on Windows NT and several versions of Unix.