Hi,

Please find below the gams equation with comments.

I have run the gams model but the phase precedence constraint is not working. For example phase 1 has to filled up before phase 2 and so on.

Equation:

LowPreceCons1(t)… sum(jp3,Ym(jp3,t)) -

sum(jp3,Qpm(jp3)*W(jp3+1,t))=G=0;

"this is the equation for precedence constraints, phase j1 has to be filled up before phase j2, then phase j3 will follow then phase j4 (its phase 1,2,3,4).

Qpm is the quantity of material in phase j.

W(j,t) is a binary variable (which is 1 = 1; if phase j is filled up in year t and 0;otherwise) whilst

Ym is total material moved from phase j during year t.

How do I let the equation above work since its more like a sequencing type of equation.

Kindly assist

Ike

Research Personnel