MULTIPLE DEGREE-OF-FREEDOM FORCE-STATE COMPONENT IDENTIFICATION

Force-state mapping is extended to allow the quasistatic characterization of realistic multiple degree-of-freedom systems whose constitutive relations are nonlinear, dissipative, coupled, and depend on memory of past states. A general constitutive force-state model is formulated, which includes dynamic hysteresis phenomena typical of that found in deployable structures. A two step parameter identification approach is developed, which employs a linear extended least squares and a nonlinear least squares fit. A six degree-of-freedom force-state testing device was constructed and used to obtain data on one bay of a simple truss and on one bay of the mid-deck 0-gravity dynamics experiment deployable truss.