Experimental characterization of hysteresis in a revolute joint for precision deployable structures

摘要

Recent studies of the microdynamic behavior of a deployable telescope metering truss have identified instabilities in the equilibrium shape of the truss in response to low-energy dynamic loading. ^Analyses indicate that these micro-dynamic instabilities arise from stick-slip friction within the truss joints. ^The present study characterizes the low-magnitude quasi-static load-cycle response of the precision revolute joints incorporated in the deployable telescope metering truss, and specifically, the hysteretic response of these joints caused by stick-slip friction within the joint. ^Detailed descriptions are presented of the test setup and data reduction algorithms, including discussions of data-error sources and data-filtering techniques. ^Test results are presented from 13 specimens, and the effects of joint preload and manufacturing tolerances are investigated. ^Using a simplified model of stick-slip friction, a relationship is made between joint load-cycle behavior and microdynamic dimensional instabilities in the deployable telescope metering truss. ^(Author)