Abstract

This paper presents the analysis methodology and major results in use of nonlinear coulomb dampers to suppress payload modes. A problem arises from large, cantilevered, soft-mounted payloads with low-frequency payload modes that are only slightly higher than the rigid body control bandwidth of the entry mission phase. Unacceptable stability and control result. Additional attenuation was obtained from two coulomb dampers plus digital bending filters. Discussed are coulomb damper and simple payload models, failures, force unbalances, limit cycles, and optimum force level. Openand closed-loop linear and non-linear methods of analyses are presented. The IUS/TDRS (interim upper stagekracking and data relay satellite) payload is used as a case study.

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