A procedure is presented for incorporating the distributed material damping effects and discrete nonlinear joint properties of truss structures into a linear analysis technique. A testing apparatus has been constructed which measures the transient response of a truss member in free-fall in a vacuum to obtain its material damping characteristics. The force-state mapping technique is presented for identifying localized nonlinearities in joints by presenting the force transmitted through the joint as a function of the full mechanical state of the joint. The nonlinear structural parameters are then linearized using an equivalent energy approach which finds the equivalent linear stiffness and linear viscous damping of each nonlinearity by equation the integrated average of the work done and energy dissipated by the nonlinearity to those of a spring and damper undergoing sinusoidal motion. Incorporation of both the distributed material damping and localized nonlinear effects is discussed in the context of forming a linear damping finite element model.
Incorporation of the effects of material damping and nonlinearities on the dynamics of space structures
Beruecksichtigung von Materialdaempfung und Nichtlinearitaeten bei der Berechnung des dynamischen Verhaltens von Raumfahrzeugen
1987
6 Seiten, 7 Bilder, 16 Quellen
Aufsatz (Konferenz)
Englisch