J191065 Study on Shape Repeatability of a Cable-network Structure

Saito, Kenta; Tanaka, Hiroaki

doi:10.1299/jsmemecj.2011._j191065-1

Cited by 2 publications

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“…Many studies about the deployment performance are conducted, and structures having superior deployment performance have been proposed (Shimazaki et al, 2013). On the other hand, conventional approach for improving the repeatability was conducted by investigating errors and its effect to the deployment (Saito and Tanaka, 2011). However, the traditional approach has a problem that results change depending on estimation of the errors.…”

Section: Introductionmentioning

confidence: 99%

A study of dynamic evaluation of structural buckling

Arita

Miyazaki

2016

Mechanical Engineering Letters

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Technology of deployable space structures is necessary for spacecraft to challenge advanced missions. It is important in designing the deployable space structures that they are easily deployable and reliably repeatable. Traditional approach for improving the repeatability was conducted by investigating errors and its effect to the deployment. However, the traditional approach has a problem that results change depending on estimation of the errors. With that background, this study proposes numerical methods to enable selection of robust deployable structures against the errors. The repeatability is decreased due to occurrence of the buckling caused by the errors. Therefore, a structure not occurring the buckling should be selected for designing of a reliably repeatable structure. The buckling is detected by non-positive eigenvalues of a stiffness matrix of the structure in static analysis. However, detection of the buckling in dynamic analysis is difficult because the eigenvalue is also non-positive when the structure has rigid-body motion. This study solved the problem by proposing a method to discriminate the buckling from the rigid-body motion. Furthermore, a method to evaluate instability of the structure quantitatively is desired when only structures occurring the buckling are available for the spacecraft. When the buckling occurs, small disturbance sets off grave displacement. Therefore, this study proposed the method to evaluate the instability quantitatively by calculating disturbance force and buckling displacement as index values of the instability based on the equation of motion. Finally, it was confirmed that the proposed methods are appropriate by the dynamic analyses of truss arch.

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Section: Introductionmentioning

confidence: 99%

A study of dynamic evaluation of structural buckling

Arita

Miyazaki

2016

Mechanical Engineering Letters

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“…It is important in designing the deployable space structures that they are easily deployable and reliably repeatable. Conventional study for improving the repeatability was conducted by investigating errors and its effect to the deployment (Yamasaki andFuruya, 2013, Saito andTanaka, 2012). However, there was no general numerical method to evaluate the reliability efficiently and quantitatively, not estimating any errors.…”

Section: Introductionmentioning

confidence: 99%

Modified method of detecting dynamic buckling

Arita

Miyazaki

2018

Mechanical Engineering Letters

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Deployable structures are necessary for spacecraft to challenge advanced missions. It is important in designing the deployable space structures that they are easily deployable and reliably repeatable. Conventional study for improving the repeatability was conducted by investigating errors and its effect to the deployment. However, there was no general numerical method to evaluate the reliability efficiently and quantitatively, not estimating any errors. Therefore, the authors proposed an original numerical method to evaluate quantitatively the reliability of the deployment by detecting buckling in a dynamic analysis of FEM in 2016. In the recent study, we found a problem of false detection of the buckling by the conventional method, and we also found a method to solve the problem. The conventional method to detect the buckling in the dynamic analysis uses mode orthogonality to the rigid-body modal space and the eigenvalue. However, it was confirmed that the rigid-body mode is not discriminated correctly for the mixed modes of the rigid-body motion and the deformation. The cause of the problem is using the eigenvalue for the judgement of the buckling because it cannot be evaluate that the sign of the eigenvalue derives whether from the rigid-body motion or from the deformation. Therefore, this study proposes a modified method, not using the eigenvalue but using the work of the deformation for the judgement of the buckling. Finally, it was confirmed that the modified method enabled proper detection of the buckling for the mixed modes of the rigid-body motion and the deformation.

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J191065 Study on Shape Repeatability of a Cable-network Structure

Cited by 2 publications

References 0 publications

A study of dynamic evaluation of structural buckling

A study of dynamic evaluation of structural buckling

Modified method of detecting dynamic buckling

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