Mechanical Behavior of Multi-Spherical Sliding Bearings
Mechanical Behavior of Multi-Spherical Sliding Bearings
http://forum.civilea.com/Thread-mech...vior-of--25621
Author: Daniel M. Fenz and Michael C. Constantinou | Size: 4.08 MB | Format: PDF | Publisher: MCEER | Year: 2008 | pages: 186
This report describes the principles of operation and the development of cyclic force-displacement relationships for three variations of multi-spherical sliding bearings: the double FP bearing, the triple FP bearing, and the modified single FP bearing. The force-displacement relationships of devices with increasingly complex behavior were determined by extending the fundamental principles of operation that apply to sliding on a single concave surface. It was shown that each device is capable of exhibiting displacement dependent adaptive behavior, i.e., desirable changes in stiffness and damping over the course of motion. These changes are determined by the relative values of each surface’s coefficient of friction, effective radius of curvature, and displacement capacity. Since all are predefined design parameters (aside from the inherent uncertainty and variability in the coefficient of friction), their behavior is completely controllable by the engineer. In addition, it was shown that in cases where multiple surfaces are of equal friction, the complexity of behavior exhibited by these devices is reduced. This is important because bearings of smaller plan dimension can still use familiar and proven methods of analysis and design, resulting in significant cost savings. A future report will detail the development, experimental verification and application of tools for dynamic analysis of structures isolated with these bearings.
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