2021-12-01T06:58:30Zhttps://repository.dl.itc.u-tokyo.ac.jp/oaioai:repository.dl.itc.u-tokyo.ac.jp:000343142021-10-01T07:23:10Z3. On the Dampimg Force of a Magnetic Damper3. 磁氣制振器の制振力に就て力武, 常次133413453application/pdfAbout ten years ago, Prof. Hagiwara has experimentally shown that the damping force f of a magnetic damper is given by the next expression f=(Cφ^2συD)/S where φ, σ, υ, D and S are total flux, specific conductivity, velocity, thickness of the metallic plate and area of the magnetic field respectively. By use of elliptic functions the writer proved theoretically this relation when the metallic plate and the magnetic field are both rectangular. The calculated value of C, which has no dimension, is about three times larger than its experimental value. This result is reasonable when we consider the effect of the leakage flux.departmental bulletin paper東京帝国大学地震研究所1947-02-28application/pdf東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University1-4233746AN0002969900408972https://repository.dl.itc.u-tokyo.ac.jp/record/34314/files/ji0231003.pdfjpn