Dynamics Properties Of Folding And Unfolding Processes Of Deployable Structures Based On Origami Configurations

Deployable structures can realize configuration transformation through mechanism movement,then they have numerous advantages,such as convenient transportation,rapid construction and reusability.Therefore,deployable structures are widely used in civil engineering,aerospace engineering,mechanical engineering and other fields.Deployable structures based on origami configurations have outstanding folding ability and excellent mechanical properties,then they have great application potential in the aspect of deployable roof.In this thesis,theoretical analyses,numerical simulations and experiments were carried out to study dynamics properties of folding and unfolding processes of deployable structures based on origami configurations,including topics as follows:(1)Degree of freedom(DOF)analysis of origami structures.The improved equilibrium matrix analysis method and the module assembly method were adopted to perform DOF analysis of a variety of origami structures.(2)Dynamics analysis of folding and unfolding processes of origami structures.A particle-bar-spring model based on the finite particle method was proposed for origami structures,and a dynamic analytical method for folding and unfolding processes of origami structures was developed based on the finite particle method.The correctness and effectiveness of the developed method were verified by energy conservation analysis and motion path analysis.The dynamic analysis of single-DOF and multi-DOF origami structures were performed.The results showed that the dynamic effect during the folding and unfolding processes had great influence on the unfolding path and motion range of origami structures.(3)Dynamics analysis of folding and unfolding processes of inflatable origami origami structures.According to the ideal gas law,a simplified two-way fluid-solid interaction model was proposed to analyze the interaction between gas and structure in inflatable deployable structures.Based on the defense node algorithm,a contact model was proposed for origami structures.Then,a dynamic analytical method for inflatable origami structures was developed based on the finite particle method.The dynamic analysis of two kinds of inflatable origami structures during the folding and unfolding processes were performed,which proved the correctness and effectiveness of the developed method.An inflatable manipulator inspired by origami structure was designed,and its motion processes was simulated,which was verified by prototype experiment.(4)Design and folding analysis of deployable roof based on Miura configuration.The spherical linkage mechanism was adopted to realize motion equivalence with the vertices of Miura configuration,then the deployable roof model was designed and made,which verified the correctness and effectiveness of the design strategy.An analysis method for column-hinge was proposed based on the finite particle method,and a dynamic analytical method for folding and unfolding processes of column-hinged linkage mechanism was developed based on the finite particle method.The unfolding process of the deployable roof based on Miura configuration was simulated and analyzed,and the results showed that the unfolding speed of deployable roof had obvious influence on the structural stress level.(5)Co-analysis between the deployable roof and the supporting structure.A co-analysis method between the deployable roof and the support structure was developed based on the finite particle method.The co-analysis between the deployable roof and the supporting structure was carried out for Hangzhou Olympic Tennis Center,which proved the correctness and effectiveness of the developed method.The structural response properties of the deployable roof based on Miura configuration and support structures were studied under different unfolding degrees and during the unfolding process.The results showed that the co-analysis could effectively consider the interaction and force changes between the deployable roof and the supporting structure,and the symmetrical design of support structure had an advantage over the asymmetrical design.This thesis provided effective solutions for dynamics analysis of deployable structures,revealed the dynamics properties of folding and unfolding processes of deployable structures based on origami configurations,and provided theory and technology for the design,analysis and manufacturing of deployable structure based on origami configurations.