WO2015097045A1 - Element de satellite - Google Patents
Element de satellite Download PDFInfo
- Publication number
- WO2015097045A1 WO2015097045A1 PCT/EP2014/078305 EP2014078305W WO2015097045A1 WO 2015097045 A1 WO2015097045 A1 WO 2015097045A1 EP 2014078305 W EP2014078305 W EP 2014078305W WO 2015097045 A1 WO2015097045 A1 WO 2015097045A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piece
- temperature
- main part
- main
- satellite
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000002241 glass-ceramic Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 3
- 239000012858 resilient material Substances 0.000 claims description 2
- 230000010339 dilation Effects 0.000 claims 1
- 230000035882 stress Effects 0.000 description 22
- 238000013467 fragmentation Methods 0.000 description 5
- 238000006062 fragmentation reaction Methods 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000006094 Zerodur Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001955 cumulated effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/64—Systems for coupling or separating cosmonautic vehicles or parts thereof, e.g. docking arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/62—Systems for re-entry into the earth's atmosphere; Retarding or landing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/66—Arrangements or adaptations of apparatus or instruments, not otherwise provided for
Definitions
- the present invention relates to an element forming part of a satellite or intended to be on board a satellite. - BACKGROUND OF THE INVENTION -
- the debris with the highest probability of reaching the ground corresponds to elements of the satellite which are made of materials whose melting temperature is high, especially greater than 1000 ° C.
- materials include glasses, ceramics such as silicon carbide (SiC) for example, and glass ceramics such as Zerodur® for example.
- Satellite elements are already known which are provided with fragmentation means for fragmenting them into smaller debris, after the satellite has become useless, in order to reduce their probability of landing on the ground.
- the document FR 2 975 079 A1 discloses such an autonomous fragmentation device of a satellite element, based on explosive.
- This device comprises a detonator which is activated by the temperature, and which itself activates an explosive cutting line.
- the activation temperature is chosen to correspond to the heating of the satellite when it enters the upper layers of the Earth's atmosphere.
- a pyrotechnic device is added to a system that is defined independently by its mission function. It must therefore be compatible with this system, resulting in management constraints that are even more difficult to meet that the system is initially complex. This is the case, in particular, of observation and / or measuring instruments, and of communication instruments.
- a pyrotechnic device requires a great precision of placement, and it is difficult to show that it will not be displaced during the beginning of the re-entry into the atmosphere, where the whole of the satellite is subjected to significant mechanical and thermal stresses.
- a ground test that would validate the pyrotechnic device is difficult to conceive.
- Document FR 2 975 080 A1 describes another autonomous device for fragmentation of a satellite element, which is also activated by temperature, but whose principle is different.
- a so-called metallothermic composition is placed on the outer surface of the element.
- This composition comprises a mixture of oxidant and reducing agent which, under the effect of heat, initiates an oxidation-reduction reaction itself strongly exothermic, to perforate the surface of the satellite element.
- the perforation creates additional edges that are further overheated during the re-entry of the satellite, which facilitates its destruction by combustion.
- the object of the present invention is to propose an improved satellite element which has effective self-destruction means, simple to implement, adapted to any shape of the element, in particular thick, and possibly when the element is of refractory material, and whose operation is certain beyond the duration of use of the satellite.
- the subject of the invention is an element forming part of a satellite or intended to be on board a satellite, and comprising a solid main part and at least one other solid piece which is embedded in the part main.
- These pieces are made of respective different materials and selected so that when a temperature of the element is increased, the main part undergoes a thermal expansion which is lower than that of the other piece.
- a threshold temperature which is itself greater than 150 ° C.
- a part of the main piece is placed in a state of mechanical stress of extension by the other piece, with a stress amplitude. mechanical expansion which is non-zero and increases as a function of the element temperature, until this element temperature reaches a breaking value for which the mechanical stress of extension causes a failure of the main room in several debris.
- the invention exploits a differential thermal expansion that exists between several parts, to produce the rupture of one of them which is put in the state of extension.
- Such operation is particularly reliable, predictable, simple to design and is subject to almost no deterioration by aging.
- the element can be further adapted so that the thermal expansion of the other part does not cause mechanical stress extension in the main room when the temperature of the element is less than 150 ° C.
- the main room is not subject to deformation, so that its initial form is preserved.
- the main room is a mirror or an optical component, its effectiveness and optical function are thus ensured throughout the operational mission of the satellite.
- the element can be adapted so that the breaking value for the temperature of the element is between 600 ° C and 2500 ° C;
- the element may comprise several other parts that are nested in the main part so as to put in respective mechanical stress states several parts of the main part, with respective amplitudes of mechanical extension stress for these parts of the main room which all grow according to the temperature of the element;
- the main room can be designed with at least one path of weakness that is arranged in this room so that breakage occurs along the path.
- each other piece can be nested in the main room on the path (s) of weakness;
- each other part can be nested in the main room with an intermediate play such that the main room is not put in a state of mechanical stress extension by the other room as the temperature of the element is less than the threshold temperature, the intermediate clearance becoming zero when the temperature of the element is equal to the threshold temperature;
- the material of the main part may comprise a glass, a ceramic, a glass-ceramic or any material having a toughness value which is K C less than 10 MPa-m 1 ' 2 ;
- each other piece may comprise a metal, a metal alloy or a ceramic
- the main piece may comprise an optical bench, a radiation mirror or a support structure, in particular a rigid structure of an observation apparatus for supporting at least one optical component of this appliance;
- each other piece may be an assembly member, a bolt, a screw, a stud, a stud, an insert or a corner.
- Such bolt of the member may be retained on the main piece by a nut, and at least one additional piece which includes a portion of resilient material may be interposed between a head of the bolt and the main piece, or between the nut and the main piece; and
- each debris of the main room has a mass less than 8 kg (kilogram), preferably less than 4 kg.
- the invention also relates to a method of designing a satellite element as described above.
- This method includes a step of determining a size of each debris that is adapted so that the debris has a residual kinetic energy value of less than 15 joules, when this debris reaches the earth's ground after re-entry of the satellite into the Earth's atmosphere. .
- FIG. 1 is a schematic view of a satellite element according to the invention before breaking the element
- FIG. 2 is a schematic view of the satellite element of FIG. 1 after breakage of the element
- FIG. 3 is a detailed sectional view of a portion of the satellite element of FIG. 1, in an initial state of the element;
- FIG. 4 is similar to FIG. 3, but illustrating the part of the satellite element in an intermediate state
- FIG. 5 corresponds to FIG. 4 for another embodiment of the invention.
- FIG. 6 is a rear perspective view of a portion of a primary telescope mirror to which the invention is applied;
- FIG. 7 is a sectional view of detail VII of FIG. 6;
- FIG. 8 is a diagram showing symbolically the variation of mechanical stresses in a satellite element according to the invention.
- FIG. 1 schematically illustrates an element 10 forming part of a satellite or intended to be on board a satellite.
- the exact form of this element does not matter with respect to the principle of the invention, so that it is shown in Figs. 1 and 2 as a square without this particular form corresponding to a real form.
- the satellite element 10 comprises a solid main part 12 and at least one other solid part 14 which is nested in the main part 12.
- the satellite element 10 comprises several other parts 14 which are nested in the main part 10, and more precisely 8 other parts 14.
- the respective materials of the main part 12 and the other parts are precisely 8 other parts 14.
- the parts 14 are different and selected so that, when a temperature of the satellite element 10 is increased, the thermal expansion of the main part 12 is lower than those of the other parts 14.
- the parts 14 generally have a coefficient of thermal expansion which is greater than the coefficient of thermal expansion of the main part 12.
- Ts which is greater than 150 ° C
- several parts 16 of the main part 12, namely the parts surrounding the parts 14, are each placed in a state of mechanical extension stress by the part 14 which is at this location.
- These states of mechanical stress extension have amplitudes of mechanical stress of respective extension which all increase as a function of the temperature of the satellite element 10, until the temperature of the satellite element 10 reaches a predetermined breaking value Tr.
- breaking temperature Tr When this breaking temperature Tr is reached, the mechanical stresses of extension are sufficiently intense in the parts 16 of the main part 12 to cause a breakage thereof into several pieces of debris 18 (FIG 2). However, it is not necessary that all the parts 16 of the element 10 simultaneously reach the breaking value Tr, so that successive breaks of the element 10 can take place separately at the level of each part 14. in some cases, the breaking value Tr may be different for separate parts 16 in the element 10, which respectively surround separate parts 14.
- the main part 12 may consist of a low ductility or low-tenacity material, especially a material which has a value of the K-ic coefficient which is less than 10 MPa-m 1 ' 2 .
- This Ki C toughness value can be measured in accordance with DIN EN ISO 18756 published in September 2005.
- the main part 12 may consist of a glass, a ceramic such as, for example, silicon carbide (SiC), or a glass-ceramic such as, for example, the material marketed under the Zerodur® appellation.
- a ceramic such as, for example, silicon carbide (SiC)
- a glass-ceramic such as, for example, the material marketed under the Zerodur® appellation.
- the main piece 12 may be an optical bench, a radiation mirror or a support structure such as a frame, holding arms or a telescope mount.
- the main part 12 can be designed with a path of weakness 20 which is arranged in the main part 12 to guide the breakage.
- the breakage can be produced by a crack which is initiated by the extension of one of the parts 16 of the main part 12, then the crack progresses along the path of weakness 20.
- Such a mode of rupture is more effective when the material of the main part 12 is fragile type ("brittle" in English).
- the weak path 20 has a cross section in the plane of these Figures, according to the diagonals of the square shape of the element 10.
- the weak path 20 may be staked by a plurality of pre-cuts made in the main part 12, in addition to the possibility that several parts 14 are themselves located on the weak path 20, to relay the opening and the progression of the crack when the breaking temperature Tr is reached.
- each piece 14 may comprise a metal, such as titanium or aluminum for example, a metal alloy or a ceramic.
- each piece 14 may be an assembly member, a bolt, a screw, a stud, a stud, an insert, a wedge, etc.
- each part 14 can be nested in the main part 12 with an intermediate play J, which exists when the temperature of the element 10 is in the range provided for the mission operation of the satellite.
- the intermediate clearance J is positive so that the main part 12 is not put in a state of mechanical stress of extension by the parts 14.
- the thermal expansion of the parts 14 does not cause mechanical stress extension in the main part 12.
- the respective surfaces of the parts 12 and 14, which are in vis-à-vis, are not in contact.
- the intermediate game J decreases as the temperature of the satellite element 10 increases, until it becomes zero when the temperature of the satellite element 10 reaches the threshold temperature Ts.
- the facing surfaces, respectively of the main part 12 and the part 14, then come into contact with one another as shown in FIG. 4.
- the intermediate clearance J remains zero but the part 14 exerts an increasing bearing force against the main part 12, by their surfaces in contact.
- the main part 12 is put in an extended state by each part 14 in part 16 surrounding area, until the main part 12 breaks up when the temperature of the satellite element 10 reaches the breaking value Tr.
- the breaking value Tr is preferably between 600 ° C and 2500 ° C.
- the rupture value Tr and the value of the threshold temperature Ts are determined by the respective materials of the parts 12 and 14, as well as by the dimensions of these parts, and particularly their dimensions at the intermediate clearance J.
- a satellite element 10 as shown in Figs. 3 and 4 includes:
- a main piece 12 of silicon carbide cylindrical with an external diameter of 200 mm (millimeter);
- the threshold temperature Ts is thus equal to 340 ° C.
- the magnitude of mechanical stress extension of the main part 12 is then 420 M Pa (megaPascal). This amplitude of stress may be sufficient to cause the breakage of the main piece 12, providing if necessary a path of weakness adequate in it.
- each other piece 14 may be constituted by a bolt which comprises a head 24 at one end of the cylindrical rod 22.
- the rod 22 is received in a bore 26 which is formed in the main part 12, and the bolt is retained on the main piece 12 by the head 24 and by a nut 28 which is screwed onto the end of the rod 22 opposite the head 24.
- the satellite element 10 may also comprise at least one additional piece, made of an elastic material and disposed between the head 24 of the bolt and the main piece 12, or between the nut 28 and the main piece 12.
- the satellite element 10 comprises two additional pieces: an additional piece 30A which is disposed between the head 24 of the bolt and the main piece 12, and an additional piece 30B which is arranged between the nut 28 and the piece main 12.
- Such additional pieces of elastic material prevent the bolt can move uncontrollably relative to the main part 12 when the temperature of the element 10 is lower than the threshold temperature Ts, but this without generating constraints in the main part 12.
- the part or parts 14 that are added by the invention do not produce any deformation of the main part 12 as the temperature of the element 10 does not exceed the threshold temperature Ts.
- Such a precaution is particularly important when the main part 10 is determined with a high geometrical requirement. This is particularly the case when the main part 12 is a reflection mirror of radiation, such as a telescope mirror.
- Fig. 5 illustrates an alternative embodiment of the invention, wherein the main part 12 is provided with a groove S which extends under its outer surface S0.
- the groove S has an opening in the surface S0 which is narrower than a section of the groove deep below the surface S0.
- the groove S may have a penetrating arrow profile in the part 12.
- a metal bar 14 is inserted into the groove S, for example by sliding the bar 14 by a lateral end of the groove S which is open.
- the diameter of the bar 14 is designed so that its peripheral surface comes into contact with the part 12 at several places inside the groove S.
- FIGs. 6 and 7 illustrate another variant embodiment of the invention, in which the main part 12 is a primary telescope mirror, which is provided with an optical surface on its anterior face 32. On its posterior face 34, the mirror 12 comprises a plurality of stiffening ribs 36, which intersect to form points of intersection 38.
- the element 10 which comprises the mirror 12 may additionally comprise a plurality of bolts 14 engaged in respective bores 26 formed in the ribs 36, and retained on these ribs 36 by their heads 24 and by respective nuts 28 screwed on their rods 22. Additional parts 30A, 30B may also be provided.
- these bolts 14 may optionally serve to retain light elements provided on the rear face 34 of the mirror 12, such as a thermal superisolation sheet (or "MLI" for MultiLayer Insulation in English, not shown).
- the mirror 12 may also be provided with a plurality of studs 14 ', each stud 14' having a head 24 'and a rod 22' which is engaged in a respective non-through bore 26 'provided at a point of intersection 38 of several ribs 36.
- the stud 14 ' is retained in the bore 26' by a key 28 ', inserted through the rod 22' and an orifice 40 which is provided at the point of intersection 38.
- An additional piece 30A may also be provided between the head 24 'of the stud 14' and the mirror 12. In addition to their function of initiating the rupture of the mirror 1 2, these studs 14 'can be used to fix the mirror 12 on a dedicated support mounted on the satellite (not shown).
- this element 10 is preferably designed so that each debris 18 of the main part 12 has a mass less than 8 kg, preferably less than 4 kg.
- each debris 18 may be provided to have a residual value of kinetic energy which is less than 15 joules when it reaches the surface of the Earth after passing through the atmosphere.
- a simulation software evolution of the main part 12 during its re-entry into the atmosphere, then each resulting debris 18, can be used.
- the two conditions on the mass and the kinetic energy of each debris 18 can be cumulated.
- the invention therefore proposes a satellite element that is capable of fragmenting autonomously, simply and efficiently during the re-entry of the satellite into the Earth's atmosphere. Indeed, the increase in the temperature of the satellite element that is generated by the re-entry induces expansion of additional parts that are introduced by the invention. This expansion of the additional parts then induces a mechanical extension stress in the main room, until this main part breaks under the effect of the expansion stress that has become excessive. This break in the main room can be guided by a predefined path of weakness.
- the sizing of an intermediate clearance between the main part and each other part can guarantee the dimensional stability of the main part throughout the operational lifetime of the satellite.
- the main part for the operating temperature range which is between -100 ° C and 120 ° C, these values being mentioned only as example.
- the exact shape of the main part, which is intended for use in mission orbit, is thus preserved. It is only from the threshold temperature Ts for the satellite element, which is greater than the operating temperature range, that the additional parts are sufficiently thermally expanded to absorb the intermediate clearance. Beyond, the pieces additional forces exert an increasing stress on the main part, which becomes sufficient to break the main room when the temperature of the satellite element has reached the breaking value Tr. 8 illustrates this principle of the invention.
- T denotes the temperature of the satellite element 10
- C symbolically denotes the amplitude of the stresses in one of the parts 16 of the main part 12, expressed in absolute value and in arbitrary unit (au)
- AT ut iii S ation is the range of values of temperature T that is intended for mission use.
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1363532 | 2013-12-24 | ||
FR1363532A FR3015437B1 (fr) | 2013-12-24 | 2013-12-24 | Element de satellite |
Publications (1)
Publication Number | Publication Date |
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WO2015097045A1 true WO2015097045A1 (fr) | 2015-07-02 |
Family
ID=50424519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/078305 WO2015097045A1 (fr) | 2013-12-24 | 2014-12-17 | Element de satellite |
Country Status (2)
Country | Link |
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FR (1) | FR3015437B1 (fr) |
WO (1) | WO2015097045A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3604143B1 (fr) * | 2018-07-30 | 2021-10-27 | European Space Agency | Disparition d'engin spatial assisté par réaction exothermique lors de son retour sur terre |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4841100A (en) * | 1987-09-02 | 1989-06-20 | Minnesota Mining And Manufacturing Company | Expanding surface mount compatible retainer post |
EP0402263A1 (fr) * | 1989-06-09 | 1990-12-12 | AEROSPATIALE Société Nationale Industrielle | Dispositif de liaison temporaire, notamment pour appendice de satellite artificiel, et procédé de libération d'une telle liaison |
FR2975079A1 (fr) * | 2011-05-13 | 2012-11-16 | Centre Nat Etd Spatiales | Procede de fabrication d'un element de vehicule spatial et element de vehicule spatial obtenu par le procede |
-
2013
- 2013-12-24 FR FR1363532A patent/FR3015437B1/fr active Active
-
2014
- 2014-12-17 WO PCT/EP2014/078305 patent/WO2015097045A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4841100A (en) * | 1987-09-02 | 1989-06-20 | Minnesota Mining And Manufacturing Company | Expanding surface mount compatible retainer post |
EP0402263A1 (fr) * | 1989-06-09 | 1990-12-12 | AEROSPATIALE Société Nationale Industrielle | Dispositif de liaison temporaire, notamment pour appendice de satellite artificiel, et procédé de libération d'une telle liaison |
FR2975079A1 (fr) * | 2011-05-13 | 2012-11-16 | Centre Nat Etd Spatiales | Procede de fabrication d'un element de vehicule spatial et element de vehicule spatial obtenu par le procede |
Also Published As
Publication number | Publication date |
---|---|
FR3015437A1 (fr) | 2015-06-26 |
FR3015437B1 (fr) | 2016-01-01 |
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