Browsing by Subject "Flexible structures"
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Item Dynamic modeling and experimental verification of a flexible-follower quick-return mechanism(Texas Tech University, 1999-05) King, Steven A.In this thesis, the dynamics of flexible multibody systems is studied. In particular, a mathematical model of a flexible-follower quick-return mechanism is generated and verified experimentally. This mechanism is of special interest as the closed-loop constraint manifests itself as a time varying load in the domain of the flexible member. The motivation for modeling this type of system is the current trend in the design of industrial equipment toward lighter weight, more slender mechanism components used in order to achieve higher productivity and lower operating cost. As a result, the usual rigid body assumptions made in the dynamic analysis of these systems are no longer valid. Flexibility of the machine elements must be considered in order to produce useful system models. System equations of motion are generated using a hybrid parameter multiplebody system modeling technique. The methodology allows rigorous formulations of the complete nonlinear, hybrid diflferential equations with boundary conditions, no Lagrange multipliers are needed. To verify the model, an experimental mechanism was constructed and data was collected for several test runs with variations of the system parameters.Item Modeling flexible multibody systems-fluid interaction(Texas Tech University, 1996-12) Ortiz, Jose L.Modeling the dynamics of a structure interacting with a fluid having a free surface is addressed. In the context of this work a structure means either a single rigid container or a rigid container coupled to a complex multibody system where each body is either rigid or flexible. The main objective of this work is to take into account the nonlinearities inherent in the dynamics of the structure and the nonlinearities due to the field and boundary conditions for the fluid model. The end result of the methodology presented herein is a set of implicit first-order differential equations for the motion of both the structure and the fluid. Emphasis is placed on the point that the motion of the structure is not prescribed but is found as part of the solution procedure. Although the set of coupled equations for the fluidstructure system is implicit, it can be put into explicit form after discretizing the fluid phase and solving for the instantaneous interaction pressure. Several numerical integration procedures can be implemented.