Transfer function of flow measurement system HELP!! 1. I have attached the question, which is to derive the transfer function of a volumetric flow measurement system.... 2. I know of the following relevant equations: F = Ma = MD^2.x Flow f = area x velocity and f through a restriction f = C(p2-p1) Also Force F = pressure x Area 3. When considering the Mass alone I have Sum of forces F = F - kx - BDx = MD^2.x therefore x/F = 1 / K + BD + MD^2 and finally, x/F = (1/k) / 1 + (B/k)D + (M/k)D^2 However I am struggling to break the problem down further. Which parts of the system do I also need to consider and how do I go about manipulation of the equations to derive the transfer function....?? Your help is very much appreciated.