Development of a High Stiffness Extendible and Retractable Mast 'Himat' for Space Applications

Kitamura, Takayuki; Yamashiro, Koichi; Obata, Akira; Natori, M. C.

doi:10.2514/6.1990-1054

Cited by 12 publications

(5 citation statements)

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“…2(a). 9) This EOB is composed of a 23-stage truss, and the total height of this EOB is only 689 mm when stored in the launcher. It is deployed to 6377 mm in orbit by sequentially extending the stages from the tip.…”

Section: Structural Analysis Modelmentioning

confidence: 99%

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Deployment Repeatability of Pointing Performance for Highly Precise Extensible Optical Bench Considering Uncertainties on Backlash and Friction

Gon

Kogiso

2020

AEROSPACE TECHNOLOGY JAPAN

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The authors have investigated the effects of uncertainties on the pointing performance of an extensible optical bench (EOB), used for a large, highly precise, space X-ray telescope. The uncertainties considered are in member length, position due to backlash, and friction at connecting nodes. This study mainly investigates the effect of friction on the pointing performance. First, the pointing performance analysis is briefly investigated. The extended EOB is modeled as a truss structure, and the distortion due to the member length imperfection is evaluated by a nonlinear, finite element analysis (FEA). Subsequently, the backlash at connecting nodes is modeled by introducing a virtual cable element with a natural length equal to the size of backlash. In addition, the deformation due to a friction force acting at the connecting node is calculated as a perturbation from the equilibrium condition without performing a contact analysis. This friction model is further extended to identify effects of friction uncertainty with reduced computational costs. Through numerical examples, the effects of friction uncertainty on the deployment repeatability for the EOB, and effects of the number of stages of EOB on the pointing performance are investigated.

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Section: Structural Analysis Modelmentioning

confidence: 99%

“…First, the effect of the friction on the pointing direction is clarified through two mod-(a) EOB. 9) (b) Analysis model. els; a simple two-dimensional and a five-stage EOB model that have huge backlash at each connecting nodes.…”

Section: Introductionmentioning

confidence: 99%

Deployment Repeatability of Pointing Performance for Highly Precise Extensible Optical Bench Considering Uncertainties on Backlash and Friction

Gon

Kogiso

2020

AEROSPACE TECHNOLOGY JAPAN

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“…Kitamura and M. Natori have developed a deployable mast called "HIMAT" [2]. Its test, analysis and application have been introduced.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a triangular prism modular deployable mast

Shan

Guo

Liu

et al. 2013

2013 IEEE International Conference on Mechatronics and Automation

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The design of a triangular prism modular deployable mast applied in outer space is introduced in this paper. Its configuration with high efficiency of stowage and locked pattern is proposed. Operating principle of the mast is raised as well. The geometry characteristics are discussed and its maximum possible folding ratio is analyzed in detail. The kinematics equations of any point on the mast are established and its deploying process is simulated to understand the regulation during deploying. The statics relationships between linkages and diagonal wires are discussed in detail. The expressions of statics parameters such as axial stiffness, bending stiffness, trosional stiffness of the deployable mast are constructed. The changing regulation of stiffness of the mast with its geometry parameters is analyzed, concluding the triangular prism modular deployable mast has a high stiffness and can be applied in space exploration.

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“…2). Although there are various types of extensible structures such as hingeless mast and telescopic rod, we adopted the same type of extensible mast which had been used in space radio telescope (Halca 2,3) ) from the view point of stiffness and extension repeatability. The major differences in the operational conditions of extensible mast between Halca and ASTRO-H were existence of bending moment and tip-mass.…”

Section: Introductionmentioning

confidence: 99%

Induced Vibration of High-Precision Extensible Optical Bench during Extension on Orbit

Ishimura

Ishida

Kawano

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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An Extensible Optical Bench (EOB) for a X-ray satellite (ASTRO-H) had a length of 6.4m in extended configuration. Although the same type of extensible mast was used in Space Radio Telescope (Halca) in 1997, the tip mass was quite different in the case of ASTRO-H. Due to the tip mass of 150kg, the natural frequency of EOB was less than 1Hz in the extended configuration. ASTRO-H was launched on Feb. 17, 2016, and the EOB was extended on Feb. 28, 2016, successfully. However, because the vibration of EOB occurred during the extension, the extension operation was carried out over four passes intermittently. When the amplitude of induced vibration excessed the predefined threshold, we stopped the extension, then stayed until the vibration was damped. In this paper, the induced vibration during extension and its mechanism are reported. Through simulations, it is confirmed that one of the major causes of the vibration is a periodic change of gap between mast and canister at the root of EOB.

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Development of a High Stiffness Extendible and Retractable Mast 'Himat' for Space Applications

Cited by 12 publications

References 0 publications

Deployment Repeatability of Pointing Performance for Highly Precise Extensible Optical Bench Considering Uncertainties on Backlash and Friction

Deployment Repeatability of Pointing Performance for Highly Precise Extensible Optical Bench Considering Uncertainties on Backlash and Friction

Design and analysis of a triangular prism modular deployable mast

Induced Vibration of High-Precision Extensible Optical Bench during Extension on Orbit

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