"The main problem with the hydraulic hybrid subsystem is high level of noise and vibration. In real working condition, the peak pressure in the high-pressure accumulator can reach 5000 psi. The vibration is mainly caused by the sliding motion of the moving parts inside the pump/motor unit. Rotation of that pump/motor components also contribute to the unbalanced torque about the rotating axis. Therefore, it is important to effectively isolate the pump/motor unit from the chassis in order to reduce the transmitted noise and vibration. Passive isolation systems are not effective over a wide operation frequency range and therefore alternative solutions are needed for this application."
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