Abstract
A colloidal damper is a damping element that has a novel structure which is fusing technology of mechanical engineering and nanotechnology. This structure is composed of cylinder and piston in which a mixture of hydrophobic porous matrix and liquid are inserted. If an external force impresses to the damper, the pressure in the cylinder increases, and then the liquid flows into the pores of porous matrix. In this time the surface extension force for compression is larger than that for relaxation. This difference of the surface extension force produces a damping energy.The colloidal damper which was applied the difference of surface extension of compression and relaxation was first developed by Eroshenko. In his device the damper had colloidal liquid and oil in the bag in the cylinder, and damping characteristics and kinds of the colloid had not studied. A simple damper composed of piston and cylinder was made to investigate the basic static characteristics of the colloidal damper in our group. Then influence of hydrophobic coatings on dynamic characteristics and endurance of coatings of the silica gel were investigated. When the damper is used in practice, there are many applications. So, effect of size of the damper should be investigated. But effect of size on the damping has not been investigated. In addition, investigation for the single cylinder type damper has been mainly studied, but this type need bias pressure to have a damping force in the negative force range. In order to avoid this disadvantage, double cylinder type damper was developed. Then in this paper the relationship between the stroke and the pressure, the dissipative energy and the efficiency are investigated for the single colloidal damper and the double colloidal damper, and dynamic characteristics of these dampers were compared. Additionally, mass-spring-damper system in which the single colloidal damper is installed is designed for the suspension of a quarter of a car to demonstrate a practical use.
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