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Title: The optimum frictional damping for a vibrating structure
Author: Mott, Norman
Awarding Body: Queen Mary, University of London
Current Institution: Queen Mary, University of London
Date of Award: 1970
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In many structures vibration is the limiting factor in their design. Increasing structural damping is one possible solution to this problem and frictional damping provides a simple cheap means of achieving this. This thesis considers the optimum value of the normal force across a frictional damper both experimentally and theoretically and whether such a damper would be of use in a machine tool. It has been shown by previous workers that "Coulomb" friction is only approximate in the case of continuous sliding and that it is likely to be a more gross approximation in the case of oscillatory sliding. The methods which have been used previously for optimising the response of a vibrating structure have only considered viscous dampen. The theoretical analysis using "Coulomb" friction has been shown for simple structures to be lengthy in computation time and thus an analysis using an equivalent sinusoidal force has been developed. This analysis has been applied to the experimental apparatus consisting of a cantilevered beam with a rigidly mounted frictional damper at the free end. The experimental and theoretical response pattern obtained are similar and such differences that occur may be traced to the differences between the assume and measured characteristics of the joint.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available