Experimental investigation of the effects of underwater exposure on the damping characteristics of bolted structural connections for plates and shells
Durham, Richard W.
Shin, Young S.
Kim, Kilsoo S.
MetadataShow full item record
Recent studies have indicated that use of the bolted structural connection and the introduction of a viscoelastic material at the joint build-up can reduce the vibration response of a structure. Many potential applications utilizing this type of vibration reduction must operate in an underwater environment. A test structure consisting of two concentric circular shells connected by four vanes and assembled with bolts was tested to determine the effects of underwater exposure on the damping properties of a bolted structure. The effects of underwater exposure on system damping were examined for various structural bolt torques and for the application of a viscoelastic layer at the joint interfaces. With increasing underwater exposure time, the modal frequencies, damping and response amplitude remained constant. The changes in the frequency response of the structure with underwater exposure resulted from the effects of increased viscous fluid layer damping at the joint interfaces. As water replaced the air at the joint interfaces, with continued underwater exposure, the effects of viscous fluid layer damping increased
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Ehnes, Charles W. (Monterey, California. Naval Postgraduate School, 2003);Damping of welded structures is a subject of great interest and application for the navy as relates to ship shock survivability and acoustic transmission of ship noise. The purpose of this research is to study the effects ...
Experimental investigation of damping characteristics of bolted structural connections for plates and shells. Iverson, Jonathan C. (1987);Reducing the contact force in bolted structural connections can reduce system vibration amplitudes by enhancing joint damping capacity. A test model consisting of two concentric circular cylindrical shells and four ...
Da Re, German Eduardo (Monterey, California: Naval Postgraduate School, 2018-09);Acoustic sensors operating in underwater environments were designed and fabricated based on the ear structure of the parasitic fly, Ormia ochracea. The design was executed using COMSOL Multiphysics, including mass loading ...