Following a study of the operating principle of a colloidal damper rendered controllable (CDRC), this Chapter presents a review of different types of controlling devices and their sensitivity. The controllability of a new form of colloidal absorber, rendered controllable under varying magnetic fields, is then experimentally tested. This absorber is made up of a water-based ferrofluid (FERROTEC MSG-W10) and a liquid-repellent nanoporous solid body made up of gamma alumina and/or silica gel particles. Permanent neodymium annular magnets are positioned either on the piston head (axial magnetic field) or on the exterior surface of the cylinder to control the dynamic properties (radial magnetic field). The quantity of the displaced liquid by the magnets through the damper’s filter and through the nanoporous solid body was estimated after flow visualisations inside a transparent model damper were done. The fluctuation of the magnetic flux density at the magnet surface with the magnet’s height and versus the target distance was measured experimentally. The appropriate magnet geometry was chosen based on this information. The trial colloidal damper’s three-dimensional structural model, created with Solidworks, and the excitation test rig are then shown. Excitation studies on a ball-screw shaker revealed that the proposed absorber had greater damping capacities than a standard colloidal damper, as well as the ability to modify the damping coefficient depending on the excitation type.
Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka-shi, Fukuoka 811-0295 Japan.
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