function xprime = pushrod(t,x);
%	pushrod(t,x) returns the state derivatives of the pushrod-lifter-valve
% system. Used by sim_pushrod.m.
global k2 m34 k6 m5 b7 omega
v1 = 2.4*sin(omega*t);
xprime = [-x(3)/(m34*m5)+v1;x(3)/m5;m34*k2*x(1)-k6*x(2)-b7*x(3)/m5];
