Dependence of Damping Characteristics of a Beam with Damping Rubber Magnetic Powder on Rubber Property
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A cantilever beam with Damping Material Applying Rubber Magnetic Powder (DRM) has been investigated. Two methods are selected to hold DRM to a vibrating steel beam, one is to attach DRM by the magnetic attractive force (called DRM beam) and the other by adhesive bonding (called AB-DRM beam). Different from the damping property of AB-DRM beam caused by shear deformation of damping material, the damping property of DRM beam is characterized by the sliding frictional loss together with the internal loss of damping material. The authors established a formulation to predict the damping characteristics of DRM beam, which was validated experimentally. It is found that rubber material loss factor β has a decisive influence on damping improvement of DRM beam versus AB-DRM beam. If β is smaller than the critical value around 0.8255, a valid range of vibratory amplitude always exists in which DRM beam can achieve better damping than AB-DRM beam; conversely, if β is bigger than the critical value, the valid range does not exist when slide occurs. Such results are used to determine the merits and limitations of DRM and develop design guidelines.
Key Wordsmagnetic vibration damper constrained layer damping friction loss factor
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- Hansaka, M. and Mifune, N., Preparation and properties of magnetic-vibration-damper. Inter-noise, 1993, 2: 859–862.Google Scholar
- Hansaka, M., Damping properties of magnetic-vibration-damper. Japanese Railway Engineering, 1993, 126: 19–20.Google Scholar
- Hansaka, M. and Mifune, N., Development of a new type high grade damper: magnetic-vibration-damper. Quarterly Report of RTRI (Railway Technical Research Institute) (Japan), 1994, 35(3): 199–201.Google Scholar
- Hansaka, M., Hayashi, I., Iwatsuki, N., et al., The damping property of magnetic rubber dampers with a constraining layer (2nd report, estimation of the loss factor of magnetic rubber dampers with a constraining layer and experimental demonstration). Transactions of the Japan Society of Mechanical Engineers, Part C, 2002, 68: 374–382 (in Japanese).CrossRefGoogle Scholar
- Srinivasan, P., Mechanical Vibration Analysis. New DelHi: Tata, McGraw-Hill Publishing Company Limited, 1982.Google Scholar
- Hansaka, M., Hayashi, I., Iwatsuki, N., et al., The damping property of magnetic rubber dampers with a constraining layer (4th report, verification of the loss factor of plates covered with the magnetic rubber dampers with a constraining layer and discussion of optimum condition for installation). Transactions of the Japan Society of Mechanical Engineers, Part C, 2002, 68(12): 3516–3524 (in Japanese).CrossRefGoogle Scholar
- Hansaka, M., Hayashi, I., Iwatsuki, N., et al., Prediction of the Decrease of Vibration of Railway Steel Bridge by Applying Magnetic Rubber Damper with a Constraining Layer. Transactions of the Japan Society of Mechanical Engineers, Part C, 2003, 69(7): 1756–1763 (in Japanese).CrossRefGoogle Scholar