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Improvement of Dynamic Spring Characteristics of Engine Mounts with Non-combination Type Dynamic Damper

Article of Honda R&D Technical Review Vol.15 No.2

Summary

Cabin noise originating in the power plant has been reduced by utilizing non-combination type dynamic dampers to reduce the absolute value of the complex spring coefficient of the engine mounts in the high-frequency range.
Development first employed simulations, which demonstrated the superiority of the non-combination type to the combination type dynamic dampers. Next, study focused on how best to exploit the structural characteristics of non-combination type dynamic dampers to enable them to be applied to the rubber parts of the engine mount. Single non-combination type dynamic damper units have been shown to control increases in the absolute spring coefficient caused by rubber surging and mount bracket resonance. Cabin noise in a completed vehicle has been also reduced. Finally, it has been confirmed that the targeted durability can be kept even with the use of the dynamic dampers on the rubber parts of the engine mount.

Reference

(1) Taniguchi, O., et al.: Forced Vibrations in Systems with Two Degrees of Freedom, Vibrational Engineering Handbook, Yokendo, p. 132 - 136 (1991)
(2) Aida, S., et al.: Vibration in Systems with Multiple Degrees of Freedom, Mechanical Engineering Handbook, Tokyo, The Japan Society of Mechanical Engineers, p. 43 - 47 (1987)

Author (organization or company)

Hitoshi NAITOH(Tochigi R&D Center)

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