(0.0825^2*5.67 + 2*0.0825^2*1.5 + 2*0.051)*u(3) + 5.67*0.035*0.0825*u(1)^2 = u(4) + M2 – 31.25*0.01*sgn(u(2)) – 31.25*0.01*sgn(u(2))
(0.0825^2*5.67 + 2*0.0825^2*1.5 + 2*0.051)*u(3) + 5.67*0.035*0.0825*u(1)^2 – u(4) + 31.25*0.01*sgn(u(2)) + 31.25*0.01*sgn(u(2)) = M2
(0.0825^2*5.67+2*0.0825^2*1.5+2*0.051)*u(3)+5.67*0.035*0.0825*u(1)^2-u(4)+31.25*0.01*sgn(u(2))+31.25*0.01*sgn(u(2))