Existence of super-harmonics in quarter-vehicle system responses with nonlinear inertia hydraulic track mount given sinusoidal force excitation

Hydraulic engine mounts (and other elastomeric devices) are usually experimentally characterized based on the assumption that mount response to harmonic displacement input is purely sinusoidal, although they contain strong super-harmonics. Time domain responses of a quarter-vehicle system with a nonlinear inertia track-type mount are examined in this communication, with emphasis on the super-harmonics. Finally, internal (mount) path forces are evaluated in order to clarify their contribution to the system responses and the effect of nonlinearities.