Vibration Testing and Finite Element Analysis of an Inflatable Structure

Abstract

Vibration testing and nite element analysis of an in ated thin-lm torus are presented. In atable structures show signi cant promises for future space applications. However, their extremely lightweight, exible, and high damping properties pose dif cult problems in vibration testing and analysis. Smart materials are used as sensors and actuators for performing vibration tests of an in ated torus. In addition, a predictive model has been developed, which can be compared with experimental results. A commercial nite element package, ANSYS, is used to model a prestressed in atable structure. Both experimental and nite element results are in reasonable agreement with each other. The predictive model can be used for analyzing the dynamics of in ated structures and for designing control systems to attenuate vibration in an in ated torus.

Multi-input multi-output vibration testing of an inflatable torus

“…Efforts on using smart materials to identify the dynamic response of an inflated torus or structure can be found in Refs. [6][7][8][9][10]18].…”

Dynamic analysis of a pressure prestressed in vacuo torus with follower load stiffness

“…The nodes at the flap-torus interface are merged. Mass was added to the surrounding elements representing the flaps (resulting from the fabrication) to simulate the presence of epoxy as in Park et al 7 and Ruggiero et al 8 Previous researchers utilized SHELL93 element in the ANSYS software, which is an eight-noded Mindlin shell without follower load formulation as per equation (10). A technique to incorporate the follower load is proposed here by meshing the surface with SURF154 element and then applying the pressure on the surface elements.…”

“…Park and Ruggiero 6 investigated the feasibility of using smart materials, such as PVDF and MFC to determine the modal parameters and to attenuate vibration in gossamer toroidal structure. Park et al 7 developed a predictive model of a prestressed gossamer torus using ANSYS which was proposed to be used for analyzing the dynamics of inflated structures and for designing control systems to attenuate vibration in an inflated torus. Ruggiero 8 performed an experimental modal analysis and control of a Kapton torus using piezoelectric actuators.…”

Modal Analysis of Bracket Structure in Automatic Drill-riveting System Based on ABAQUS

“…After submitting the analysis job in ABAQUS, the modal analysis of bracket is done, the natural frequencies and the corresponding inherent mode shapes are obtained. According to the existing dynamics study [9], we know that low order natural vibration effects larger on the vibration of the structure, so we usually take the former orders when doing analysis and calculation of structure vibration characteristics. The former 10 order modal analysis results of bracket are shown in table 2, the former 4 order modal shapes of bracket and product are shown in figure 4.…”