May I suggest that you try an approximation for Y before attempting the inverse Laplace transformation? See ?Pade. Or, you could approximate the time lag as exp(-Ts) = 1 - Ts, or 1/(Ts + 1). This worked for me Y := numapprox:-pade(Y,s=1.5,[3,3]); Hope this helps. J. Tarr

Take a look at the Maple Application Center. There are several worksheets that solve similar problems to yours in the Mechanical and Civil Engineering and Structures sections. Something that should solve any problem in this area is Harald Kammerer's Statics package downloadable from the Research Power Tools area. Check out the examples he gives. Good luck! J. Tarr