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Math Forum / Math Software / MATLAB / July 2008Draining Tank Problem
Hi, i'm implementing a draining tank in simulink. The original height starts from a memory block and is decremented each iteration by a constant flow loss (which is previously fed into an integrator and the inverse of the area of the tank). The answer should be linear but i'm recieving a nonlinear plot. also, i'm using ode45. does anyone know where i'm going wrong? I'm not sure what is the problem, if you could upload a jpg showing your block diagram it might help. Here is how I would do it though - I'd set the initial value of an integrator to the original height, set a floor on the value possible to zero, and the input to the integrator would be a constant negative number. Alternatively, you can just generate a ramp and subtract it from the original height (you still need the saturation effects though) "Joseph Stuber" <stuber_joseph@yahoo.com> wrote in message <g6spp9$chr$1@fred.mathworks.com>... > Hi, i'm implementing a draining tank in simulink. The > original height starts from a memory block and is [quoted text clipped - 3 lines] > recieving a nonlinear plot. also, i'm using ode45. does > anyone know where i'm going wrong? Maybe your tank is spherical. |
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