WO2019225294A1 - パイプ構造体およびトラス構造体およびこれらを用いた人工衛星 - Google Patents

パイプ構造体およびトラス構造体およびこれらを用いた人工衛星 Download PDF

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Publication number
WO2019225294A1
WO2019225294A1 PCT/JP2019/017890 JP2019017890W WO2019225294A1 WO 2019225294 A1 WO2019225294 A1 WO 2019225294A1 JP 2019017890 W JP2019017890 W JP 2019017890W WO 2019225294 A1 WO2019225294 A1 WO 2019225294A1
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Prior art keywords
pipe
moisture
intermediate member
pipe structure
diameter side
Prior art date
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PCT/JP2019/017890
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English (en)
French (fr)
Inventor
和規 高垣
一史 関根
久米　将実
壮平 鮫島
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to EP19807035.1A priority Critical patent/EP3798137A4/en
Priority to US17/049,577 priority patent/US20210047057A1/en
Priority to JP2019546418A priority patent/JP6645634B1/ja
Publication of WO2019225294A1 publication Critical patent/WO2019225294A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • B29C70/228—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being stacked in parallel layers with fibres of adjacent layers crossing at substantial angles
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Definitions

  • the present invention relates to a truss structure used in an optical observation satellite or the like and a pipe structure which is a constituent member thereof.
  • Optical observation satellites are expected to be able to capture high-resolution images with excellent readability and stable image quality. For this purpose, it is required to maintain stable optical observation performance on the orbit for a long time. In order to realize such an optical observation satellite, a large mirror and a supporting structure having high rigidity and high dimensional stability that support it are necessary.
  • a truss structure in which a plurality of fiber reinforced plastic (FRP: Fiber Reinforced Plastics) pipes and metal joints are coupled (for example, patent documents). 1). Although such a truss structure is highly rigid, there is a problem in dimensional stability because the FRP pipe that absorbs and expands moisture on the ground undergoes dehumidification and shrinkage in outer space, resulting in distortion in the structure.
  • FRP Fiber Reinforced Plastics
  • JP 58-71119 A page 2-3, FIG. 3
  • JP 2017-219811 page 9, FIG. 5
  • This invention has been made to solve the above-described problems. By reliably preventing moisture absorption of the FRP pipe, it is possible to prevent exhaustion and shrinkage in outer space, and to improve dimensional stability. An excellent pipe structure and truss structure are obtained.
  • a pipe structure according to the present invention includes a fiber reinforced plastic pipe, a moisture-proof foil covering the outer peripheral surface and the inner peripheral surface of the pipe, and a metal intermediate member fitted to the end of the pipe.
  • the end of the moisture-proof foil is sandwiched between the pipe and the intermediate member.
  • the truss structure according to the present invention is composed of the above-described pipe structure and a metal joint joined to intermediate members of the plurality of pipe structures.
  • the end portions of the moisture-proof foil covering the outer peripheral surface and the inner peripheral surface of the pipe are sandwiched in close contact between the pipe and the intermediate member, so that moisture absorption is reliably prevented and exhausted in outer space. Wet shrinkage can be prevented. As a result, a pipe structure and a truss structure excellent in dimensional stability can be obtained.
  • FIG. 1 is a schematic view of a truss structure according to Embodiment 1 for carrying out the present invention.
  • the truss structure 1 of the present embodiment includes a pipe structure 2 and a joint 3.
  • FIG. 2 is a schematic diagram of an artificial satellite 10 using the truss structure 1 of the present embodiment.
  • the truss structure 1 according to the present embodiment is a three-dimensionally configured support structure for supporting the reflecting mirror 35 and the like mounted on the artificial satellite.
  • FIG. 3 is a perspective view showing, in cross section, a connection portion between the pipe structure 2 and the joint 3 according to the present embodiment.
  • each member is shown separately for easy understanding, but all members are actually fastened.
  • the pipe structure 2 includes an intermediate member 4 for fastening with the joint 3, a pipe 5, and moisture-proof foils 11 and 12.
  • the intermediate member 4 is connected to both ends of the pipe 5. ing.
  • the intermediate member 4 and the pipe 5 have a cylindrical shape.
  • the intermediate member 4 has a shape that can be fitted to the joint 3 and the pipe 5.
  • the shape of the joint 3 on the side opposite to the side in contact with the intermediate member 4 is integrated with the other joint to constitute the truss structure shown in FIG. 1, but the structure is omitted. .
  • the joint 3 and the intermediate member 4 are made of metal, and the pipe 5 is made of fiber reinforced plastic.
  • a metal constituting the joint 3 and the intermediate member 4 for example, a super invar alloy made of iron, nickel and cobalt can be used.
  • the fiber reinforced plastic constituting the pipe 5 for example, a carbon fiber reinforced plastic obtained by impregnating a cyanate resin into a high elastic carbon fiber K13C (manufactured by Mitsubishi Chemical Corporation) or T800S (manufactured by Toray Industries, Inc.) can be used.
  • the pipe structure 2 is fastened and fixed by, for example, bolts and nuts using the through holes 6 formed in the joint 3 and the through holes 7 of the intermediate member 4 formed corresponding to the positions.
  • the pipe 5 has convex portions 8 projecting toward the intermediate member 4 at both ends.
  • the intermediate member 4 has a recess 9 formed at a position where the intermediate member 4 is fitted with the protrusion 8 of the pipe 5.
  • the moisture-proof foils 11 and 12 covering the surface of the pipe 5 are disposed on the outer peripheral surface and the inner peripheral surface of the pipe 5, respectively.
  • the end portions of the moisture-proof foils 11 and 12 are tightly sandwiched between the pipe 5 and the intermediate member 4.
  • an aluminum foil can be used as the moisture-proof foils 11 and 12.
  • the intermediate member 4, the pipe 5, and the moisture-proof foils 11 and 12 are integrated in a pipe structure manufacturing process described later.
  • FIG. 4 is a schematic cross-sectional view of the truss structure 1 in which the joint 3, the intermediate member 4, the pipe 5, and the moisture-proof foils 11 and 12 are integrated.
  • the joint 3 and the intermediate member 4 are fastened so that the position of the through hole 6 formed in the joint 3 matches the position of the through hole 7 of the intermediate member 4.
  • the intermediate member 4 and the pipe 5 are fastened with the end portions of the moisture-proof foils 11 and 12 being sandwiched therebetween. In this way, the pipe structure 2 and the joint 3 are fastened to constitute the truss structure 1 shown in FIG.
  • FIG. 5 is a schematic cross-sectional view of the pipe structure 2 of the present embodiment.
  • the pipe 5 has a cylindrical shape, and convex portions 8 that protrude in the axial direction toward the intermediate member 4 side are formed at both ends.
  • the intermediate member 4 has a recess 9 formed at a position where the intermediate member 4 is fitted with the protrusion 8 of the pipe 5.
  • the outer peripheral side of the pipe 5 is covered with a moisture-proof foil 11, and the end of the moisture-proof foil 11 exists up to the outer peripheral surface of the convex portion 8, and is sandwiched between the inner peripheral surface of the concave portion 9 of the intermediate member.
  • the inner peripheral side of the pipe 5 is also covered with the moisture-proof foil 12, and the end of the moisture-proof foil 12 exists up to the end face of the tip of the pipe 5 and is sandwiched between the end face of the recess 9 of the intermediate member. .
  • 6 and 7 are explanatory views showing the manufacturing process of the pipe structure 2 in the present embodiment.
  • the moisture-proof foil 12 is disposed on the outer peripheral surface of the cylindrical mandrel 21.
  • a plurality of prepregs are stacked in a cylindrical shape on the outer peripheral side of the moisture-proof foil 12.
  • a prepreg is a semi-cured sheet produced by impregnating carbon fibers with a resin.
  • the axial length of the plurality of prepregs stacked on the outer peripheral side is shortened.
  • a laminate of a plurality of prepregs in a cylindrical shape is called a prepreg laminate 22.
  • the moisture-proof foil 11 is arranged on the outer peripheral side of the outermost prepreg. As shown in FIG. 6A, when the length in the axial direction (longitudinal direction) of the prepreg laminate 22 is l and the length in the radial direction of the end portion of the prepreg laminate 22 is m, the moisture-proof foils 11 and 12 The length in the axial direction is longer than l and shorter than l + m / 2. The end portions of the moisture-proof foil 11 and the moisture-proof foil 12 are bent along the end portions of the prepreg laminate 22.
  • the intermediate member 4 is disposed so as to be in close contact with the end of the prepreg laminate 22. At this time, the end portions of the moisture-proof foil 11 and the moisture-proof foil 12 are sandwiched between the prepreg laminate 22 and the intermediate member 4.
  • the mandrel 21, the prepreg laminate 22, and the intermediate member 4 are covered with the bagging film 23 and sealed with the bagging film 23 and the sealing material 24.
  • These members are installed in an autoclave apparatus, and are heated by pressurizing from the outside of the bagging film 23 while discharging the sealed air with an exhaust pump (not shown). For example, the pressure is maintained at 120 ° C. for 3 hours under a pressure of 3 atmospheres. The pressurizing condition and heating condition are appropriately set depending on the resin used for the prepreg.
  • the pipe structure is completed by cooling to room temperature and removing from the autoclave apparatus and removing the bagging film 23 and the mandrel 21.
  • the resin component of the prepreg laminate 22 is once melted, and the prepreg laminate 22 and the intermediate member 4 are integrated into a FRP pipe.
  • the end part of the moisture-proof foil 11 and the moisture-proof foil 12 is closely_contact
  • the pipe structure immediately after completion is in a state where moisture has been removed by being heated under pressure in the autoclave apparatus.
  • the pipe structure manufactured in such a process does not contain moisture. Further, the outer peripheral surface and inner peripheral surface of the FRP pipe are covered with moisture-proof foil, and the end portion of the moisture-proof foil is tightly sandwiched between the pipe and the intermediate member. Will not peel from the pipe. Therefore, moisture absorption of the FRP pipe can be reliably prevented. As a result, it is possible to prevent moisture from shrinking in outer space, so that a pipe structure and a truss structure excellent in dimensional stability can be obtained. In addition, moisture absorption / extraction does not occur in the metal intermediate member and the joint.
  • FIG. 8 is a cross-sectional view showing the configuration of a measurement system for measuring the thermal expansion coefficient in the longitudinal direction (axial direction) of the pipe structure in the present embodiment.
  • the joint 3 is connected to both ends of the pipe structure 2 as shown in FIGS. 3 and 4.
  • laser reflecting mirrors 31 are bonded and fixed to the outer surfaces of the joints 3 connected to both ends of the pipe structure 2.
  • the pipe structure 2 is placed on the sample support base 32 and placed in the constant temperature and humidity chamber 33.
  • the laser reflecting mirror 31 is irradiated with laser light, and the reflected light is received to receive the pipe structure 2.
  • the amount of deformation can be measured.
  • the temperature and humidity of the constant temperature and humidity chamber 33 were controlled, and the time change of the deformation amount of the pipe structure 2 was measured.
  • the FRP pipe portion of the pipe structure 2 used for the measurement has an inner diameter of 50 mm, an outer diameter of 55 mm, and a length of 300 mm.
  • materials for the FRP pipe two types of prepregs were used: a prepreg impregnated with cyanate resin in K13C (manufactured by Mitsubishi Chemical Corporation) and a prepreg impregnated with cyanate resin in T800S (manufactured by Toray Industries, Inc.).
  • the thermal expansion coefficient in the longitudinal direction (axial direction) of the FRP pipe is within ⁇ 0.1 ppm / K. Designed.
  • Aluminum foil was used for the moisture-proof foil.
  • Super Invar was used as a material for the joint 3 and the intermediate member.
  • the thermal deformation of the pipe structure in the temperature change range ( ⁇ 10K) experienced by the support structure of the large mirror of the optical observation satellite is about ⁇ 0.3 ⁇ m. Therefore, if the maximum shrinkage due to the moisture exhaustion shrinkage is 0.5 ⁇ m, it is almost the same as the thermal deformation, so that there is no problem as a support structure for the large mirror of the optical observation satellite.
  • the pipe structure without moisture-proof foil expands by 5 ⁇ m on the ground. Therefore, the maximum amount of moisture contraction in the outer space of the pipe structure without moisture-proof foil is 5 ⁇ m, which is deformed more than thermal deformation, causing a problem in dimensional stability.
  • the outer peripheral surface and inner peripheral surface of the FRP pipe are covered with moisture-proof foil, and the end portion of the moisture-proof foil is tightly sandwiched between the pipe and the intermediate member. It is possible to prevent moisture absorption of the pipe made. As a result, it is possible to prevent moisture from shrinking in outer space, so that a pipe structure and a truss structure excellent in dimensional stability can be obtained.
  • the both end portions of the pipe are provided with convex portions protruding toward the intermediate member, and the intermediate member is provided with a concave portion at a position where it is fitted with the convex portion of the pipe. Is not necessary. If the end portion of the moisture-proof foil covering the outer peripheral surface and the inner peripheral surface of the pipe is tightly sandwiched between the pipe and the intermediate member, moisture absorption of the FRP pipe can be prevented.
  • an aluminum foil is used as the moisture-proof foil.
  • a material other than aluminum foil may be used as long as it does not allow moisture to permeate.
  • nickel foil, titanium foil, copper foil, or western foil (copper zinc alloy foil) may be used as the moisture-proof foil.
  • a laminate obtained by laminating these metal foils with, for example, a polyester resin can be used as a moisture-proof foil.
  • the cylindrical pipe structure has been described, but the cross section may be polygonal as long as it is cylindrical.
  • the joint 3 and the intermediate member 4 are bolts using the through-hole 6 formed in the joint 3 and the through-hole 7 of the intermediate member 4 formed corresponding to the position. It can be fastened and fixed by other methods. For example, mechanical fastening methods such as rivet joining and screw joining, and metallurgical joining methods such as fusion joining and pressure joining can be used. It may be used.
  • the prepreg composed of carbon fibers has been described.
  • glass fibers or ceramic fibers other than carbon fibers may be used.
  • FIG. 1 The pipe structure according to the first embodiment has one convex portion at both ends of the pipe, but in the second embodiment, a pipe structure having two or more convex portions will be described.
  • FIG. 9 is an explanatory view showing a manufacturing process of the pipe structure 2 in the present embodiment.
  • FIG. 9E is a schematic diagram of the pipe structure 2 that has completed the lamination process.
  • the intermediate member 4 has one concave portion corresponding to each of a plurality of convex portions of the pipe.
  • the divided intermediate members 4a to 4d having are prepared.
  • the pipe is composed of a prepreg laminate 22 in which a plurality of prepregs 22a are laminated.
  • the moisture-proof foil 12 on the inner peripheral side is disposed on the mandrel 21, and a plurality of prepregs 22a are stacked thereon.
  • the length of the prepreg 22a in the axial direction is appropriately set so as to correspond to the plurality of convex portions of the pipe.
  • the length of the two prepregs 22a in the portion serving as a convex portion is increased in the axial direction, and the two prepregs 22a thereon are shortened.
  • the laminated thickness h1 of the prepreg is substantially matched with the thickness of the divided intermediate member 4a.
  • the end of the moisture-proof foil 12 is bent along the end of the prepreg 22a.
  • the divided intermediate member 4a is arranged.
  • the end portion of the moisture-proof foil 12 is surely sandwiched between the prepreg laminate and the divided intermediate member 4a.
  • a plurality of prepregs 22a are stacked on the divided intermediate member 4a and the already stacked prepregs.
  • the length of the prepreg 22a in the axial direction is appropriately set so as to correspond to the plurality of convex portions of the pipe.
  • the laminated thickness h2 of the prepreg is substantially matched with the thickness of the divided intermediate member 4b.
  • the divided intermediate member 4b is arranged. Thereafter, the lamination of the prepreg 22a and the lamination of the divided intermediate member are repeated.
  • the moisture-proof foil 11 on the outer peripheral side is disposed, and the end of the moisture-proof foil 11 is bent along the end of the prepreg 22a.
  • the divided intermediate member 4d is arranged from above, and the stacking process of the pipe structure 2 is completed.
  • the pipe structure 2 is completed by pressurizing and heating the pipe structure 2 in which the lamination process is completed using the autoclave apparatus described in the first embodiment.
  • the pipe structure manufactured by such a process covers the outer peripheral surface and the inner peripheral surface of the FRP pipe with moisture-proof foil, and the end of the moisture-proof foil between the pipe and the intermediate member, as in the first embodiment. Since it is in close contact with each other, moisture absorption of the FRP pipe can be reliably prevented.
  • Embodiment 3 In the pipe structure described in the first embodiment and the second embodiment, it is important that the end portion of the moisture-proof foil is securely stuck between the pipe and the intermediate member.
  • the third embodiment a configuration will be described in which the end portion of the moisture-proof foil is securely stuck between the pipe and the intermediate member.
  • FIG. 10 is a schematic cross-sectional view of the pipe structure 2 of the present embodiment.
  • the pipe structure of the present embodiment is a pipe structure including the plurality of convex portions described in the second embodiment, and FIG. 10 shows a portion of the convex portion located on the outermost periphery in the radial direction.
  • the convex part 8 located in the outermost periphery of the pipe 5 of this Embodiment is comprised by the prepreg 22a of 4 layers.
  • the orientation direction of the carbon fibers of the two layers of prepregs 22a on the inner diameter side is set in a direction parallel to the axial direction of the pipe structure.
  • the orientation direction of the carbon fibers of the two-layer prepreg 22a on the outer diameter side is perpendicular to the axial direction of the pipe structure. Is set.
  • the thermal expansion coefficient of a prepreg is anisotropic with respect to the orientation direction of the carbon fiber, and the thermal expansion coefficient in a direction parallel to the orientation direction of the carbon fiber is a thermal expansion coefficient in a direction perpendicular to the orientation direction of the carbon fiber.
  • the convex portion 8 located on the outermost periphery of the pipe of the present embodiment is divided into two regions with respect to the radial direction of the pipe, and the thermal expansion coefficient in the axial direction of the region on the outer diameter side is the inner diameter. It becomes larger than the thermal expansion coefficient in the axial direction of the region on the side.
  • the convex portion 8 located on the innermost periphery of the pipe 5 is constituted by four layers of the prepreg 22a, and the orientation direction of the carbon fibers of the two layers of the prepreg 22a on the inner diameter side is set in the axial direction.
  • the orientation direction of the carbon fibers of the two-layer prepreg 22a on the outer diameter side is set in a direction parallel to the axial direction.
  • the convex portion located on the outermost periphery in the cooling step is It will warp toward the outside in the radial direction. This is because the outer peripheral region shrinks more greatly in the cooling step because the axial thermal expansion coefficient of the outer diameter side region is larger than the axial thermal expansion coefficient of the inner diameter side region. Therefore, the moisture-proof foil 11 is pressed toward the outer side in the radial direction so as to be in close contact with the intermediate member 4. At the same time, the convex portion located on the innermost circumference warps inward in the radial direction. Therefore, the moisture-proof foil 12 is pressed toward the inner side in the radial direction to be brought into close contact with the intermediate member 4.
  • the pipe structure of the present embodiment is pressed in a direction in which the moisture-proof foils 11 and 12 are in close contact with the intermediate member 4 in the cooling process when the pipe structure is completed using an autoclave device.
  • the end portion of the moisture-proof foil is securely stuck between the pipe and the intermediate member, so that moisture absorption can be prevented more reliably.
  • the pipe structure having a plurality of convex portions is divided into two regions having different thermal expansion coefficients in both the convex portion located on the outermost periphery and the convex portion located on the innermost periphery.
  • only one of the convex portions may be used.
  • the convex portion is divided into two regions, and the orientation directions of the carbon fibers in each region are orthogonal to each other, but they are not necessarily orthogonal.
  • the cooling process it is sufficient if there is a difference in the coefficient of thermal expansion necessary for the moisture-proof foil to be pressed in the direction in which the moisture-proof foil is in close contact with the intermediate member. That's fine.
  • FIG. 11 is a schematic cross-sectional view of the pipe structure 2 of the present embodiment.
  • the pipe structure of the present embodiment is a pipe structure including the plurality of convex portions described in the second embodiment, and FIG. 11 shows a portion of the convex portion located on the outermost periphery in the radial direction.
  • the outer peripheral surface and the inner peripheral surface of the concave portion of the intermediate member 4 corresponding to the convex portion 8 located on the outermost outer periphery of the pipe 5 are roughened. ing.
  • the roughened intermediate member 4 bites into the prepreg 22a.
  • the end portion of the moisture-proof foil is securely stuck between the pipe and the intermediate member, so that moisture absorption can be prevented more reliably.

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Abstract

繊維強化プラスチック製のパイプ５と、このパイプ５の外周面および内周面をそれぞれ覆う防湿箔１１、１２と、パイプ５の端部に嵌め合わされた金属製の中間部材４とを備えており、防湿箔１１、１２の端部が、パイプ５と中間部材４との間に密着して挟み込まれているものである。この構成とすることにより、確実にＦＲＰ製パイプの吸湿を防止することにより、宇宙空間で排湿収縮することを防ぐことができ、寸法安定性に優れたパイプ構造体を得ることができる。

Description

パイプ構造体およびトラス構造体およびこれらを用いた人工衛星
　この発明は、光学観測衛星などで用いられるトラス構造体と、その構成部材であるパイプ構造体に関する。
　光学観測衛星では、判読性に優れ安定した画質の高分解能画像を撮影できることが望まれている。そのためには、長期にわたって軌道上で安定した光学観測性能を維持可能なことが求められている。そのような光学観測衛星の実現には、大型鏡とそれを支える高剛性で寸法安定性の高い支持構造体とが必要である。
　高剛性で寸法安定性の高い支持構造体の一つとして、繊維強化プラスチック（ＦＲＰ：Ｆｉｂｅｒ　Ｒｅｉｎｆｏｒｃｅｄ　Ｐｌａｓｔｉｃｓ）製パイプと金属製継手とを複数結合したトラス構造体が知られている（例えば、特許文献１参照）。このようなトラス構造体は高剛性ではあるが、地上で吸湿膨張したＦＲＰ製パイプが宇宙空間で排湿収縮することで構造にゆがみが生じるため寸法安定性に問題がある。
　一方、人工衛星に搭載されるＦＲＰ製ミラー構造体において、ＦＲＰの吸湿および排湿に伴う悪影響を避けるために、ＦＲＰの表面を金属箔層やメッキ層などの防湿層で覆うことが知られている（例えば、特許文献２参照）。
特開昭５８-７１１１９号公報（２－３頁、第３図） 特開２０１７－２１９８１１号公報（９頁、図５）
　しかしながら、ＦＲＰ製パイプの表面を防湿層で覆った場合、パイプと防湿層の熱膨張率が異なるため防湿箔がパイプから剥離し、防湿効果が保持できないという課題がある。
　この発明は、上述のような課題を解決するためになされたもので、確実にＦＲＰ製パイプの吸湿を防止することにより、宇宙空間で排湿収縮することを防ぐことができ、寸法安定性に優れたパイプ構造体およびトラス構造体を得るものである。
　この発明に係るパイプ構造体は、繊維強化プラスチック製のパイプと、このパイプの外周面および内周面をそれぞれ覆う防湿箔と、パイプの端部に嵌め合わされた金属製の中間部材とを備えており、防湿箔の端部が、パイプと中間部材との間に密着して挟み込まれているものである。
　また、この発明に係るトラス構造体は、上述のパイプ構造体と、複数のパイプ構造体の中間部材に接合された金属製の継ぎ手とで構成されたものである。
　この発明は、パイプの外周面および内周面をそれぞれ覆う防湿箔の端部が、パイプと中間部材との間に密着して挟み込まれているので、確実に吸湿を防止して宇宙空間で排湿収縮を防ぐことができる。その結果、寸法安定性に優れたパイプ構造体およびトラス構造体を得ることができる。
この発明の実施の形態１を示すトラス構造体の模式図である。 この発明の実施の形態１を示す人工衛星の模式図である。 この発明の実施の形態１を示すトラス構造体の斜視図である。 この発明の実施の形態１を示すトラス構造体の断面模式図である。 この発明の実施の形態１を示すパイプ構造体の断面模式図である。 この発明の実施の形態１を示すパイプ構造体の製造工程の説明図である。 この発明の実施の形態１を示すパイプ構造体の製造工程の説明図である。 この発明の実施の形態１を示すパイプ構造体の測定系の断面図である。 この発明の実施の形態２を示すパイプ構造体の製造工程の説明図である。 この発明の実施の形態３を示すパイプ構造体の断面模式図である。 この発明の実施の形態４を示すパイプ構造体の断面模式図である。
　以下、本発明を実施するためのパイプ構造体およびトラス構造体並びにパイプ構造体の製造方法を、図面を用いて説明する。なお、図面の説明においては、同一部分または相当部分には同一符号を付し、重複する説明を省略する。
実施の形態１．
　図１は、この発明を実施するための実施の形態１に係るトラス構造体の模式図である。図１に示すように、本実施の形態のトラス構造体１は、パイプ構造体２と継ぎ手３とで構成されている。図２は、本実施の形態のトラス構造体１を使用した人工衛星１０の模式図である。図２に示すように、本実施の形態のトラス構造体１は、人工衛星に搭載される反射鏡３５などを支えるための３次元的に構成された支持構造体である。
　図３は、本実施の形態のパイプ構造体２と継ぎ手３との接続部分を断面で示した斜視図である。図３では理解しやすいように各部材を分離して示しているが、実際にはすべての部材が締結されている。図３に示すように、パイプ構造体２は、継ぎ手３と締結するための中間部材４とパイプ５と防湿箔１１、１２とで構成されており、パイプ５の両端に中間部材４が接続されている。中間部材４およびパイプ５は円筒形状の形状である。中間部材４は継ぎ手３とパイプ５に嵌め合わせ可能な形状である。図３において、継ぎ手３の中間部材４と接する側と反対側の形状は、図１に示すトラス構造体を構成するために他の継ぎ手と一体となっているがその構造は省略し示している。
　継ぎ手３および中間部材４は金属で構成されており、パイプ５は繊維強化プラスチックで構成されている。継ぎ手３および中間部材４を構成する金属としては、例えば鉄、ニッケルおよびコバルトからなるスーパーインバー合金を用いることができる。パイプ５を構成する繊維強化プラスチックとしては、例えば、高弾性炭素繊維Ｋ１３Ｃ（三菱ケミカル社製）またはＴ８００Ｓ（東レ社製）にシアネート樹脂を含侵させた炭素繊維強化プラスチックを用いることができる。
　パイプ構造体２は、継ぎ手３に形成された貫通孔６とその位置に対応して形成された中間部材４の貫通孔７とを用いて、例えばボルトとナットとで締結固定される。
　パイプ５は、両端部に中間部材４側に突出した凸部８が形成されている。中間部材４は、パイプ５の凸部８と嵌め合わせる位置に凹部９が形成されている。
　パイプ５の外周面および内周面にはパイプ５の表面を覆う防湿箔１１，１２がそれぞれ配置されている。この防湿箔１１、１２の端部は、パイプ５と中間部材４との間に密着して挟み込まれている。防湿箔１１、１２は、例えばアルミニウム箔を用いることができる。中間部材４、パイプ５および防湿箔１１、１２は、後述するパイプ構造体の製造工程において一体化される。
　図４は、継ぎ手３、中間部材４、パイプ５および防湿箔１１、１２が一体化されたトラス構造体１の断面模式図である。図４に示すように、継ぎ手３と中間部材４とは、継ぎ手３に形成された貫通孔６の位置と中間部材４の貫通孔７の位置とを一致させて締結されている。また、中間部材４とパイプ５とは、防湿箔１１、１２の端部を挟み込んで締結されている。このようにパイプ構造体２と継ぎ手３とが締結されて、図１に示すトラス構造体１を構成している。
　図５は、本実施の形態のパイプ構造体２の断面模式図である。パイプ５は、筒状の形状であり両端部に中間部材４側に向かって軸方向に突出した凸部８が形成されている。中間部材４は、パイプ５の凸部８と嵌め合わせる位置に凹部９が形成されている。パイプ５の外周側は防湿箔１１で覆われており、防湿箔１１の端部は凸部８の外周面まで存在し、中間部材の凹部９の内周面との間に挟みこまれている。パイプ５の内周側も防湿箔１２で覆われており、防湿箔１２の端部はパイプ５の先端部の端面まで存在し、中間部材の凹部９の端面との間に挟みこまれている。
　次に、本実施の形態のパイプ構造体２の製造方法について説明する。図６および図７は、本実施の形態におけるパイプ構造体２の製造工程を示す説明図である。
　始めに、図６（ａ）に示すように、円柱状のマンドレル２１の外周面に防湿箔１２を配置する。防湿箔１２の外周側にプリプレグを円筒形状に複数枚重ねる。プリプレグとは、炭素繊維に樹脂を含侵して作製された半硬化状態のシートである。このとき、軸方向に突出した凸部８を形成するために、外周側に重ねる複数枚のプリプレグの軸方向の長さは短くする。このプリプレグを円筒形状に複数枚重ねたものをプリプレグ積層体２２と呼ぶ。
　最外周のプリプレグの外周側に防湿箔１１を配置する。図６（ａ）に示すように、プリプレグ積層体２２の軸方向（長手方向）の長さをｌ、プリプレグ積層体２２の端部の径方向の長さをｍとすると、防湿箔１１、１２の軸方向の長さはｌよりも長くｌ＋ｍ／２よりも短くする。防湿箔１１および防湿箔１２の端部は、プリプレグ積層体２２の端部に沿うように折り曲げる。
　次に、図６（ｂ）に示すように、プリプレグ積層体２２の端部に密着するように中間部材４を配置する。このとき、防湿箔１１および防湿箔１２の端部は、プリプレグ積層体２２と中間部材４との間に挟みこまれている。
　次に、図７に示すように、マンドレル２１、プリプレグ積層体２２および中間部材４をバギングフィルム２３で覆い、バギングフィルム２３とシール材２４とで密閉する。これらの部材をオートクレーブ装置内に設置し、密閉された内部の空気を排気ポンプ（図示せず）で排出しながらバギングフィルム２３の外部から加圧して加熱する。例えば３気圧に加圧した状態で１２０℃で３時間保持する。加圧条件および加熱条件は、プリプレグに用いる樹脂のよって適宜設定される。最後に、室温に冷却してオートクレーブ装置から取り出し、バギングフィルム２３およびマンドレル２１を取り除くことによって、パイプ構造体を完成させる。
　このような工程によって、プリプレグ積層体２２の樹脂成分が一旦溶融し、プリプレグ積層体２２と中間部材４とが一体となってＦＲＰ製のパイプとなる。また、オートクレーブ装置内において加圧条件下で加熱されたことにより、防湿箔１１および防湿箔１２の端部は、パイプと中間部材との間に密着して挟み込まれている。さらに、オートクレーブ装置内において加圧条件下で加熱されたことで、完成直後のパイプ構造体は水分が抜けた状態となっている。
　このような工程で作製されたパイプ構造体は水分を含まない。また、ＦＲＰ製のパイプの外周面および内周面は防湿箔で覆われており、防湿箔の端部はパイプと中間部材との間に密着して挟み込まれているので、冷却後でも防湿箔がパイプから剥離することはない。そのため、確実にＦＲＰ製パイプの吸湿を防止することができる。その結果、宇宙空間で排湿収縮することを防ぐことができるので、寸法安定性に優れたパイプ構造体およびトラス構造体を得ることができる。なお、金属製の中間部材および継ぎ手では吸排湿は発生しない。
　本実施の形態で得られるパイプ構造体の寸法安定性を測定した結果の一例について説明する。図８は、本実施の形態におけるパイプ構造体の長手方向（軸方向）の熱膨張係数を測定するための測定系の構成を示す断面図である。図８において、パイプ構造体２の両端には、図３および図４で示したように、継ぎ手３が接続されている。図８に示すように、パイプ構造体２の両端に接続された継ぎ手３の外面にレーザー反射鏡３１がそれぞれ接着固定されている。このパイプ構造体２をサンプル支持台３２に載置して、恒温恒湿槽３３内に配置する。恒温恒湿槽３３の窓を介してレーザー反射鏡３１に対向して配置されたレーザー変位計３４を用いて、レーザー反射鏡３１へレーザー光を照射しその反射光を受光してパイプ構造体２の変形量を測定することができる。恒温恒湿槽３３の温度および湿度を制御して、パイプ構造体２の変形量の時間変化を測定した。
　測定に用いたパイプ構造体２のＦＲＰ製のパイプの部分は、内径が５０ｍｍ、外径が５５ｍｍ、長さが３００ｍｍである。ＦＲＰ製パイプの材料として、Ｋ１３Ｃ（三菱ケミカル社製）にシアネート樹脂を含侵させたプリプレグと、Ｔ８００Ｓ（東レ社製）にシアネート樹脂を含侵させたプリプレグとの２種類のプリプレグを用いた。この２種類のプリプレグ積層枚数の割合と、それぞれのプリプレグの繊維配向角を設計することにより、ＦＲＰ製パイプの長手方向（軸方向）の熱膨張率を±０．１ｐｐｍ／Ｋ以内となるように設計した。防湿箔には、アルミニウム箔を使用した。継ぎ手３および中間部材の材料として、スーパーインバーを用いた。
　恒温恒湿槽３３内を温度２５±２℃、湿度５０±１０％ＲＨの環境とし、３００時間経過後のパイプ構造体２の長手方向の変形量を測定した結果、長手方向に０．５μｍ膨張していることがわかった。なお、比較のため、防湿箔のないパイプ構造体を作製して同じ条件で変形量を測定した結果は、長手方向に５μｍ膨張する結果となった。地上での０．５μｍの膨張であれば、宇宙空間での排湿収縮は最大０．５μｍと予想される。
　一方、光学観測衛星の大型鏡の支持構造体が受ける温度変化範囲（±１０Ｋ）におけるパイプ構造体の熱変形は±０．３μｍ程度である。したがって、排湿収縮に起因する収縮が最大０．５μｍであれば熱変形と同程度であるので、光学観測衛星の大型鏡の支持構造体として問題ない範囲である。
　しかしながら、防湿箔のないパイプ構造体では地上では５μｍ膨張してしまう。そのため、防湿箔のないパイプ構造体の宇宙空間での排湿収縮は最大５μｍとなり、熱変形以上に変形するため寸法安定性に問題が生じる。
　本実施の形態のように、ＦＲＰ製のパイプの外周面および内周面を防湿箔で覆い、防湿箔の端部をパイプと中間部材との間に密着して挟み込んでいるので、確実にＦＲＰ製パイプの吸湿を防止しすることができる。その結果、宇宙空間で排湿収縮することを防ぐことができるので、寸法安定性に優れたパイプ構造体およびトラス構造体を得ることができる。
　なお、本実施の形態において、パイプの両端部には中間部材側に突出した凸部を設け、中間部材にはパイプの凸部と嵌め合わせる位置に凹部が設けているが、凸部と凹部とはなくてもよい。パイプの外周面および内周面の表面を覆う防湿箔の端部がパイプと中間部材との間に密着して挟み込まれていれば、ＦＲＰ製パイプの吸湿を防止することができる。
　また、本実施の形態においては、防湿箔としてアルミニウム箔を用いたが、水分を透過させない素材であればアルミニウム箔以外の材料でもよい。例えば、防湿箔としてニッケル箔、チタン箔、銅箔、洋箔（銅亜鉛合金箔）などを用いてもよい。また、電気的に絶縁性が必要であれば、これらの金属箔を例えばポリエステル樹脂などでラミネートしたものを防湿箔として用いることもできる。
　また、本実施の形態においては、円筒形状のパイプ構造体として説明したが、筒状であれば断面が多角形であってもよい。
　また、本実施の形態においては、継ぎ手３と中間部材４とは、継ぎ手３に形成された貫通孔６とその位置に対応して形成された中間部材４の貫通孔７とを用いて、ボルトとナットとで締結固定しているが、それ以外の方法で締結固定してもよい、例えば、リベット接合やねじ接合などの機械的締結方法や、溶融接合や圧着接合などの冶金的接合方法を用いてもよい。
　なお、本実施の形態では炭素繊維で構成されたプリプレグで説明したが、炭素繊維以外の、例えばガラス繊維、セラミック繊維などを用いてもよい。
実施の形態２．
　実施の形態１のパイプ構造体は、パイプの両端部にひとつの凸部を備えていたが実施の形態２では、２つ以上の凸部を備えたパイプ構造体について説明する。
　図９は、本実施の形態におけるパイプ構造体２の製造工程を示す説明図である。図９（ｅ）は、積層工程を完了したパイプ構造体２の模式図になるが、図９（ｅ）に示すように中間部材４として、パイプの複数の凸部にそれぞれ対応した１つの凹部をもつ分割中間部材４ａ～４ｄを用意する。パイプは、複数のプリプレグ２２ａが積層されたプリプレグ積層体２２で構成されている。
　始めに、図９（ａ）に示すように、マンドレル２１の上に内周側の防湿箔１２を配置し、その上にプリプレグ２２ａを複数枚重ねる。このときパイプの複数の凸部に対応するように、プリプレグ２２ａの軸方向の長さを適宜設定する。図９（ａ）の例では、凸部となる部分の２枚のプリプレグ２２ａの軸方向の長さを長くし、その上の２枚のプリプレグ２２ａをそれより短くしている。このときプリプレグの積層厚みｈ１は、分割中間部材４ａの厚みとほぼ一致させる。防湿箔１２の端部は、プリプレグ２２ａの端部に沿うように折り曲げる。
　次に、図９（ｂ）に示すように、分割中間部材４ａを配置する。このとき、図９（ｂ）の右側に示した拡大図に示すように、防湿箔１２の端部が確実に、プリプレグ積層体と分割中間部材４ａとの間に挟みこまれるようにする。
　次に、図９（ｃ）に示すように、分割中間部材４ａおよび既に積層されたプリプレグの上にプリプレグ２２ａを複数枚重ねる。このときパイプの複数の凸部に対応するように、プリプレグ２２ａの軸方向の長さを適宜設定する。このときプリプレグの積層厚みｈ２は、分割中間部材４ｂの厚みとほぼ一致させる。
　次に、図９（ｄ）に示すように、分割中間部材４ｂを配置する。これ以降、プリプレグ２２ａの積層と分割中間部材との積層を繰り返す。
　次に、図９（ｅ）に示すように、最上層のプリプレグ２２ａ配置した後、外周側の防湿箔１１を配置し、防湿箔１１の端部をプリプレグ２２ａの端部に沿うように折り曲げる。その上から分割中間部材４ｄを配置してパイプ構造体２の積層工程を完了させる。
　最後に、積層工程が完了したパイプ構造体２を、実施の形態１で説明したオートクレーブ装置を用いて加圧および加熱することでパイプ構造体２を完成させる。
　このような工程で作製されたパイプ構造体は、実施の形態１と同様に、ＦＲＰ製のパイプの外周面および内周面を防湿箔で覆い、防湿箔の端部をパイプと中間部材との間に密着して挟み込んでいるので、確実にＦＲＰ製パイプの吸湿を防止しすることができる。
　また、パイプに形成された凸部を径方向に複数有するので、パイプと中間部材との接合がより強固になり、パイプ構造体の強度が向上する。
実施の形態３．
　実施の形態１および実施の形態２で説明したパイプ構造体において、防湿箔の端部がパイプと中間部材との間に確実に密着して挟み込まれていることが重要である。実施の形態３においては、防湿箔の端部がパイプと中間部材との間に確実に密着して挟み込まれる構成について説明する。
　図１０は、本実施の形態のパイプ構造体２の断面模式図である。本実施の形態のパイプ構造体は、実施の形態２で説明した複数の凸部を備えたパイプ構造体であり、図１０は、径方向の最外周に位置する凸部の部分を示している。図１０に示すように、本実施の形態のパイプ５の最外周に位置する凸部８は、４層のプリプレグ２２ａで構成されている。この４層のプリプレグ２２ａのうち、内径側の２層のプリプレグ２２ａの炭素繊維の配向方向は、パイプ構造体の軸方向と平行な方向に設定されている。また、パイプ５の最外周に位置する凸部８の４層のプリプレグ２２ａのうち、外径側の２層のプリプレグ２２ａの炭素繊維の配向方向は、パイプ構造体の軸方向と直交する方向に設定されている。
　一般に、プリプレグの熱膨張係数は炭素繊維の配向方向に対して異方性をもち、炭素繊維の配向方向に平行な方向の熱膨張係数は、炭素繊維の配向方向に直交する方向の熱膨張係数に比べて小さい。したがって、本実施の形態のパイプの最外周に位置する凸部８は、パイプの径方向に対して２つの領域に区分されており、外径側の領域の軸方向の熱膨張係数が、内径側の領域の軸方向の熱膨張係数より大きくなる。
　同様に、図示はしていないが、パイプ５の最内周に位置する凸部８を４層のプリプレグ２２ａで構成し、内径側の２層のプリプレグ２２ａの炭素繊維の配向方向を、軸方向と直交する方向に設定し、外径側の２層のプリプレグ２２ａの炭素繊維の配向方向を軸方向と平行な方向に設定する。
　このように構成されたパイプを用いて実施の形態２で説明したパイプ構造体を作製すると、オートクレーブ装置を用いてパイプ構造体を完成させたときに、冷却工程において最外周に位置する凸部は径方向外側へ向かって反ることになる。なぜなら、外径側の領域の軸方向の熱膨張係数が、内径側の領域の軸方向の熱膨張係数より大きいので、冷却工程において外周側の領域がより大きく収縮するためである。そのため、防湿箔１１を径方向外側に向かって押し付けて中間部材４へ密着させることなる。同時に、最内周に位置する凸部は径方向内側へ向かって反ることになる。そのため、防湿箔１２を径方向内側に向かって押し付けて中間部材４へ密着させることなる。
　本実施の形態のパイプ構造体は、オートクレーブ装置を用いてパイプ構造体を完成させたときに、冷却工程において防湿箔１１、１２が中間部材４へ密着する方向に押し付けられる。その結果、防湿箔の端部がパイプと中間部材との間に確実に密着して挟み込まれるので、より確実に吸湿を防止しすることができる。
　なお、本実施の形態においては、複数の凸部を備えたパイプ構造体の最外周に位置する凸部と最内周に位置する凸部との両方において熱膨張係数の異なる２つの領域に区分したが、どちらか一方の凸部のみでもよい。
　また、本実施の形態においては、凸部を２つの領域に区分し、それぞれの領域の炭素繊維の配向方向を互いに直交する方向としているが、必ずしも直交している必要はない。冷却工程において、防湿箔が中間部材へ密着する方向に押し付けられる作用が生じるのに必要な熱膨張係数の差が存在すればよいので、それぞれの領域の炭素繊維の配向方向が互いに交差していればよい。
実施の形態４．
　図１１は、本実施の形態のパイプ構造体２の断面模式図である。本実施の形態のパイプ構造体は、実施の形態２で説明した複数の凸部を備えたパイプ構造体であり、図１１は、径方向の最外周に位置する凸部の部分を示している。図１１に示すように、本実施の形態のパイプ構造体においては、パイプ５の最外周に位置する凸部８に対応する中間部材４の凹部の外周面および内周面の表面を粗面化している。
　本実施の形態のパイプ構造体は、オートクレーブ装置を用いてパイプ構造体を加圧して加熱するときに、粗面化された中間部材４がプリプレグ２２ａに食い込む。その結果、防湿箔の端部がパイプと中間部材との間に確実に密着して挟み込まれるので、より確実に吸湿を防止しすることができる。
　なお、本実施の形態においては複数の凸部を備えたパイプ構造体で説明したが、１つの凸部を備えたパイプ構造体にも適用できる。
１　トラス構造体、　２　パイプ構造体、　３　継ぎ手、　４　中間部材、　５　パイプ、　６、７　貫通孔、　８凸部、　９　凹部、　１０　人工衛星、１１、１２　防湿箔、　２１　マンドレル、　２２　プリプレグ積層体、　２２ａ　プリプレグ、　２３　バギングフィルム、　２４　シール材、　３１　レーザー反射鏡、　３２　サンプル支持台、　３３　恒温恒湿槽、　３４　レーザー変位計　３５　反射鏡

Claims (11)

  1. 繊維強化プラスチック製のパイプと、
    このパイプの外周面および内周面をそれぞれ覆う防湿箔と、
    前記パイプの端部に嵌め合わされた金属製の中間部材と
    を備えたパイプ構造体であって、
    前記防湿箔の端部は、前記パイプと前記中間部材との間に密着して挟み込まれている
    ことを特徴とするパイプ構造体。
  2. 前記パイプは、前記パイプの端部に軸方向に突出した凸部を有する
    ことを特徴とする請求項１に記載のパイプ構造体。
  3. 前記パイプは、前記凸部を径方向に複数有する
    ことを特徴とする請求項２に記載のパイプ構造体。
  4. 複数の前記凸部のうち径方向の最外周に位置する凸部は、前記パイプの径方向に対して２つの領域に区分されており、
    外径側の領域の軸方向の熱膨張係数が、内径側の領域の軸方向の熱膨張係数より大きい
    ことを特徴とする請求項３に記載のパイプ構造体。
  5. 複数の前記凸部のうち径方向の最内周に位置する凸部は、前記パイプの径方向に対して２つの領域に区分されており、
    内径側の領域の軸方向の熱膨張係数が、外径側の領域の軸方向の熱膨張係数より大きい
    ことを特徴とする請求項３に記載のパイプ構造体。
  6. 前記外径側の領域の繊維強化プラスチックの繊維の配向方向に対して、前記内径側の領域の繊維強化プラスチックの繊維の配向方向が交差している
    ことを特徴とする請求項４または５に記載のパイプ構造体。
  7. 前記外径側の領域の繊維強化プラスチックの繊維の配向方向に対して、前記内径側の領域の繊維強化プラスチックの繊維の配向方向が直交している
    ことを特徴とする請求項６に記載のパイプ構造体。
  8. 防湿フィルムを介して前記パイプと対向する前記中間部材の表面が粗面である
    ことを特徴とする請求項１～７のいずれか１項に記載のパイプ構造体。
  9. 複数の請求項１～８のいずれか１項に記載のパイプ構造体と、
    複数の前記パイプ構造体の中間部材に接合された金属製の継ぎ手と
    で構成されたことを特徴とするトラス構造体。
  10. 請求項１～８のいずれか１項に記載のパイプ構造体を用いた
    ことを特徴とする人工衛星。
  11. 請求項９に記載のトラス構造体を用いた
    ことを特徴とする人工衛星。
PCT/JP2019/017890 2018-05-23 2019-04-26 パイプ構造体およびトラス構造体およびこれらを用いた人工衛星 WO2019225294A1 (ja)

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US17/049,577 US20210047057A1 (en) 2018-05-23 2019-04-26 Pipe structure, truss structure, and artificial satellite using the same
JP2019546418A JP6645634B1 (ja) 2018-05-23 2019-04-26 パイプ構造体およびトラス構造体およびこれらを用いた人工衛星

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