The nonlinear behavior of a passive zero-spring-rate suspension systemVarious concepts for advanced syspension systems have been proposed for counteracting gravity loads in ground vibration testing of large space structures. Approximating the flight modes of a low-frequency flexible structure in a ground test requires a very soft suspension system. The dynamic behavior of a passive zero-spring-rate mechanism, sometimes used for such ground testing, is analyzed. This mechanism reduces the stiffness inherent in suspending a test specimen by cables. However, the mechanism is shown to be sensitive to imperfections. Imperfections can initiate nonlinear behavior which becomes more pronounced at lower operating frequencies. Furthermore, large pendular motion of the suspension system couples with the vertical motion, producing additional nonlinearity.
Document ID
19880045037
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Woodard, Stanley E. (NASA Langley Research Center Hampton, VA, United States)
Housner, Jerrold M. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Structural Mechanics
Report/Patent Number
AIAA PAPER 88-2316
Meeting Information
Meeting: Structures, Structural Dynamics and Materials Conference