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Research on Engine Mount Characteristics Identification of Outboard Motor Using Experimental Modal Analysis

Article of Honda R&D Technical Review Vol.18 No.1

Summary

Research was conducted on a method which can directly determine the engine mount dynamic stiffness in an outboard motor to gain a better understanding of the engine mount vibration characteristics of an outboard motor.
First, a method was established to identify the dynamic stiffness of the engine mount in a physical coordinate system using modal parameters acquired from experimental modal analysis. Using the calculation results obtained by the finite element method applied to the outboard motor model, it was revealed that this method has the ability to identify dynamic stiffness with high accuracy.
Next, the method was applied to two outboard motor models, the small BF5 (3.7kW) and the large BF225 (165kW). The dynamic stiffness of the engine mount was identified by the results of experimental modal analysis and it was compared to the result obtained by the conventional method using the dynamic stiffness measurement equipment. The results show that this method can identify the engine mount dynamic stiffness more adequately than the conventional method, even when the engine mounts are subjected to loads corresponding to thrust force or even in the case that the stiffness of the parts supporting an outboard motor is low.

Reference

(1) Shiomi, K., Okada, T., Ohkawa, T., Ikeno, T.: Reducing Vibration of 2-Cylinder Outboard Motor by Pendulum Motion Mount Method, HONDA R&D Technical Review, Vol. 12, No. 2, p. 119-126
(2) Kyuse, M., Takahashi, K., Sakai, T.: Improving Suspension and Engine Mount Transfer Path Analysis Accuracy with Respect to Low Frequency Noise and Vibration, Honda R&D Technical Review, Vol. 16, No. 1, p. 197-200
(3) Plunt, J.: Examples of using Transfer Path Analysis (TPA) together with CAE-models to diagnose and find solutions for NVH problems late in the vehicle development process, SAE 2005-01-2508
(4) Testing Method for Dynamic Properties of Rubber Vulcanizates, JIS K 6394
(5) Tomatsu, T., Okada, T., Ikeno, T., Shiomi, K., Okuma, M.: A method to Identify the Stiffness of Engine Mounts Using Experimental Modal Analysis, Journal of the Japan Society of Mechanical Engineers, Vol. 71, No. 709, C, p. 49-56 (2005)

Author (organization or company)

Takeshi OKADA(Asakahigashi R&D Center)、Kazuyuki SHIOMI(Asakahigashi R&D Center)、Tetsuro IKENO(Asakahigashi R&D Center)

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