Recent content by umarkhan

hello, If I have two LTI system in G1(s) and G2(s) and I know that for a certain fraction of the time period G1 is active and for the reminaing fraction G2 is active, then is there any method to get the equivalent transfer function ? Umat.

hello, I have read in a number of papers that if we have a cantilever beam and are only interested in the movement of the tip when the base is being excited at the frequency of the first eigen mode , then the whole beam can be replaced by a spring mass system. Can anyone tell me of a...

hello, if I have a sinusoidal signal that has changing amplitude and phase with respect to time, how can I find the amplitude and phase with respect to time? So given x(t) the probem is to find a(t) and p(t)? Thanks.

hi, Thanks for the link. I tried some thing similar for the system x1 + x2 = 1. I converted to linear programming problem and then used linprog from matlab. The trick is to to put the L1 norm minimization in the for of two inequalities for each variable. f=[1 1 0 0 ]'; A=[-1 0 -1 0...

Hi, Can anyone tell me how to find the minimal L1 norm solution to the problem Ax=b using a linear programming method possibly the simplex search?? Any links where I can find something ?? Khan.