2326 A design method for a space antenna structure consisting of radial ribs and hoop cables

Tanaka, Hiroaki; Akita, Takeshi; Kogiso, Nozomu; Ishimura, Kosei; Sakamoto, Hiraku; Ogi, Yoshiro; Miyazaki, Yuji

doi:10.1299/jsmecmd.2011.24.687

Cited by 2 publications

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“…Demonstrating the effectiveness of different vibration frequencies and durations, we established a method of correcting the deviation in the deployment of the space structure by applying vibration with a macro fiber composite (MFC) actuator. (Ishimura et al, 2012, Tanaka et al, 2011 2. Outline of experiment Figure 2 shows parts of antenna.…”

Section: Introductionmentioning

confidence: 99%

Improvement of deployment repeatability by the vibration produced by macro fiber composite actuator

Sakamoto

Tanaka

Ogi³

2016

Mechanical Engineering Letters

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In this study, a method of improving the positioning accuracy of deployable space structures was developed and its effectiveness demonstrated. When a space structure expands, friction is generated at the joints between different parts. This friction has adverse effects on the positioning accuracy and produces deviations from the expected position during operation. To achieve high positioning accuracy, it is necessary to not only minimize the friction at the joint but also correct the deviation after it occurs. We apply vibration produced by a macro fiber composite (MFC) actuator to correct the deviation caused by friction. A portion of the structure including the joint is simulated by a simple beam and a ball bearing joint. In the results of our experiments, we observed the effect of applying vibration on the correction of deviations. We also determined the effective vibration based on the natural frequency of the beam and the necessary vibration duration. This method may contribute to improving the accuracy of deployment operations.

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Section: Introductionmentioning

confidence: 99%

Improvement of deployment repeatability by the vibration produced by macro fiber composite actuator

Sakamoto

Tanaka

Ogi³

2016

Mechanical Engineering Letters

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Trade-off analysis for structural design of high-precision space reflector using multiobjective optimization method

Kodama

Kogiso

Toyoda

et al. 2015

Mechanical Engineering Journal

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This study investigates the robustness of a space reflector structure consisting of radial ribs and hoop cables by using the multiobjective optimization method. The radial ribs are deformed into a parabola shape by cable tensions applied to the hoop cables that are arranged concentrically around the central hub and to the tie cables that are connected to the deployable structure. The design problem is to achieve the ideal deformation shape for the radial rib under the prescribed cable tensions through the determination of the rib height distribution. In addition, the ability to adjust the shape by changing the cable tension is required for handling uncertainty under actual environment condition. A simplified structural model with only one radial rib is used for structural design, where the cables are replaced by equivalent tensions. This study adopts the multiobjective optimization method to verify the structural design by investigating the trade-off between the deformation error and its sensitivity with respect to the cable tensions. Robustness corresponds to lower value of sensitivity, that the RMS error is difficult to deteriorate by changing the cable tension. On the other hand, design with higher value of sensitivity is called adjustability, because such a design is easy to adjust the deformation shape by the cable tension. The primary objective of the design problem is to minimize the RMS error between the ideal and the deformation shape of the rib under the prescribed cable tension in terms of the rib dimensions. The other two objectives are to accomplish the robustness and the adjustability of the rib deformation shape by adjusting the cable tension using the tie cable and the outermost hoop cable. This multiobjective optimization problem is evaluated by the satisficing tradeoff method (STOM). Through investigating Pareto solutions obtained from the two-objective and then the threeobjective function problems, the effects of cable tension variations on the surface shape error and the robustness are discussed.

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2326 A design method for a space antenna structure consisting of radial ribs and hoop cables

Cited by 2 publications

References 0 publications

Improvement of deployment repeatability by the vibration produced by macro fiber composite actuator

Improvement of deployment repeatability by the vibration produced by macro fiber composite actuator

Trade-off analysis for structural design of high-precision space reflector using multiobjective optimization method

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