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Study of Hydro Bush for Reduction of Harshness and Road Noise

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

Summary

Isolation rubber parts with hydro structures have low dynamic stiffness and high damping, and also allow high degrees of freedom in setting the required characteristics. The project discussed in this paper studied the methods of utilizing these advantages in suspension bushes in order to improve ride comfort and reduce road noise.
With regard to the harshness experienced when driving on a stepped road, the inputs are in phase for the left and right tires in the majority of cases, and this phenomenon formed the focus of this study. Hydro bushes with different characteristics for the right and left sides were used to generate phase differences in the transmission powers to the chassis, enabling the development of a method of countering the transmission powers on the left and right sides. This method has enabled the transmission powers in the chassis on stepped road to be reduced.
Tire vibration when driving on rough paved road is transmitted to the cabin through the suspension. It was discovered that considerations of the rubber bush in the suspension system as a spring element and a damping element, and of the arm as a rigid body element and a elastic element, were important factors in the reduction of road noise. Optimization of the hydro bushes on this basis enabled the level of road noise experienced in the cabin to be reduced.

Reference

(1) Minakawa, M. et al.: A vibration transfer reduction technique by use of method of measuring force transmitted from road surface to tire, JSAE, Vol. 54, No. 11, p. 21-26 (2000)
(2) Sano, H. et al.: Low order modeling of an acoustic path for active noise control and design method of feedback control, HONDA R&D Technical Review, Vol. 12, No. 1. P. 129-136 (2000)
(3) Miyagishima, Y.: Introduction to a proving center in North America, JSAE, Vol. 54, No. 6, p. 13-17 (2000)

Author (organization or company)

Yasuo MIYAMOTO(Tochigi R&D Center)、Sou NAKAMURA(Tochigi R&D Center)

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