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A mechanism for a deployable optical structure of a small satellite

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Abstract

In this paper, we present a deployment mechanism that is applicable to a deployable optical structure where the focus is on satellite miniaturization. It is designed with a passive deployment mechanism that utilizes a spring hinge. In order to confirm the feasibility of the designed deployable mechanism, we theoretically analyze the alignment errors (de-space, tilt, and de-center) that influence the optical performance of the structure. The theoretical results are as follows: a de-space of 180.0 µm, a tilt of 1941.3 µrad, and a decenter of 45.3 µm. In addition, we measure alignment errors to evaluate the actual alignment errors for a manufactured deployable mechanism. The experimental results are as follows: a de-space of 180.2 µm, a tilt of 218.8 µrad, and a de-center of 617.5 µm. Finally, we investigate the factors causing the differences between the theoretical and experimental values, and we suggest a method for improving the alignment errors.

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Abbreviations

L :

length of panel

h:

height of deployment mechanism

r :

magnitude of joint clearance

sh :

magnitude of hole margin for the screw assembly

sr :

tightened degree of screw

θ :

rotation between global coordinate system and local coordinate system

\(\overrightarrow {cl_j }\) :

error vector due to joint clearance

\(\overrightarrow {cl_sh }\) :

maximum error vector when fastening spring hinge and hole

\(\overrightarrow {cl_sr }\) :

error vector by degree of tightening of screw

\(\overrightarrow {cl_j } (i)\) :

error vector due to joint clearance of i-th case

\(\overrightarrow {cl_j } (j)\) :

error vector due to joint clearance of j-th case

\(\overrightarrow {cl_sh } (k)\) :

error vector when fastening spring hinge and hole of k-th case

\(\overrightarrow {cl_sr } (l)\) :

error vector by degree of tightening of screw of l-th case

\(\overrightarrow {cl}\) :

error vector in a,b,c,d that are considered an error of all kinds

X:

x component of global coordinate

Y:

y component of global coordinate

Z :

z component of global coordinate

x :

x component of local coordinate

y :

y component of local coordinate

z :

z component of local coordinate

\(\overrightarrow {a_{ideal} }\) :

ideal position vector of \(\vec a\)

\(\overrightarrow {b_{ideal} }\) :

ideal position vector of \(\vec b\)

\(\overrightarrow {c_{ideal} }\) :

ideal position vector of \(\vec c\)

\(\overrightarrow {d_{ideal} }\) :

ideal position vector of \(\vec d\)

\(\overrightarrow {a_{real} }\) :

real position vector of \(\vec a\)

\(\overrightarrow {b_{real} }\) :

real position vector of \(\vec b\)

\(\overrightarrow {c_{real} }\) :

real position vector of \(\vec c\)

\(\overrightarrow {d_{real} }\) :

real position vector of \(\vec d\)

\(\overrightarrow {a_i }\) :

i-th case of real position vector of \(\vec a\)

\(\overrightarrow {b_j }\) :

j-th case of real position vector of \(\vec b\)

\(\overrightarrow {c_k }\) :

k-th case of real position vector of \(\vec c\)

\(\overrightarrow {d_l }\) :

l-th case of real position vector of \(\vec d\)

\(\overrightarrow {v_1 }\) :

\(\vec a_i - \vec b_j\)

\(\overrightarrow {v_2 }\) :

\(\vec b_j - \vec c_k\)

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Correspondence to Byungkyu Kim.

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Choi, J., Lee, D., Hwang, K. et al. A mechanism for a deployable optical structure of a small satellite. Int. J. Precis. Eng. Manuf. 16, 2537–2543 (2015). https://doi.org/10.1007/s12541-015-0325-5

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  • DOI: https://doi.org/10.1007/s12541-015-0325-5

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