ABSTRACT
The excitation by engine results in inertial forces and moments as well as the moment of combustion. In the last couple of years the effects of the engine motion on comfort are being observed very intensively. The inertial force and the moment of inertia change only with ω, that means with the speed of the engine and - with equal transmission ratio - with the driving speed. The moment of inertia of the second order is the largest of the amplitudes of the moments, followed by the moments of gas second and fourth order and finally the moment of inertial fourth order. The resonance peaks get very high with the small rubber damping; however the amplitudes become small in a hypercritical case, they run towards a horizontal asymptote. The mounting moment of the mass load of 4th order is almost neglectably small compared with the one of the 2nd order in a frequency region between idle range and maximum speed.
