| The usual magnetorheological (MR) fluid dampers get energy externally to effectively damp unwanted motion. Recent research focuses on self-powered systems that get their energy internally from the vibrations. We have characterized the electromagnetic induction (E.M.I.) damper by two methods. First, a magnet freely traverses a coil of wire like in an Atwood machine and secondly, a magnet is driven sinusoidally in a coil of wire placed on a force sensor. In the first method, we look into how best to model the conversion of mechanical energy into electrical energy. Secondly, damping force is measured in relation to induced voltage and linear velocity. Coefficient of damping of different coils is measured and compared with different wire thickness and magnet length to coil width ratio. An E.M.I damping model is introduced and used in both cases to explain the phenomena of E.M.I. damping. |
