Abstract:
A two-step process for joining a first part to a second part, the first part having a coefficient of thermal expansion lower than the coefficient of thermal expansion of the second part. An anchor layer is then brazed at a lower temperature to the first part having a high thermal expansion coefficient. The anchor layer has a thickness such that upon cooling it will yield to relieve stress build up resulting from the differing thermal expansion coefficients between it and the first part. The anchor layer is then brazed to the part having a high thermal expansion coefficient. The process is particularly useful for joining carbon-carbon composite parts to copper substrates for use in the manufacture of high temperature heat exchangers as used, for example, in nuclear fusion reactors.
Abstract:
A method for forming a bi-metallic structural bulkhead assembly (10) formed from at least two sections. A thin strip of metal (16), metallurgically similar, and weldable to, a plurality of lower metal sections (14) is explosion bonded to an upper metal section (12). The lower section(s) (14) are then welded to the thin metal strip (16), thus forming the structural assembly (10). The structural bulkhead assembly (10) may then be properly machined and subjected to an appropriate heat teatment process.
Abstract:
Permanent magnets (2) affixed to one structure (1) produce a repelling force to magnets (4) affixed to a larger structure (3) that encloses the one structure (1) to suspend and hold the one structure (1) entirely within the larger structure (3), without physical contact therebetween.
Abstract:
The image correlation method and apparatus correlates or matches a test image with a template. The image correlation apparatus includes an image processor for partitioning the template into a number of labels, for determining the total number of pixels N>T i j,i j j,i j i T
Abstract:
A pressure sensitive paint (24) is coated onto the surface (20) over which a pressure distribution is to be measured. A pressure sensitive paint is a mixture of a silanol-terminated polydimethylsiloxane and methyltriacetoxysilane, and a photoluminescent activeagent such as tris(4,7-diphenyl-1,10-phenanthroline) ruthenium (II) chloride pentahydrate. The binder and active agent are placed into an appropriate amount of a solvent for the binder and the active agent, such as dichloromethane, and applied to a surface (20). In testing of the surface, such as wind tunnel (22) testing, the active agent quantitatively luminesces responsive to the localexternal pressure at the surface.
Abstract:
An aluminum-alloy article such as a fastener or rivet (40) is prepared by providing an aluminum-alloy article precursor that is not in its final heat-treated state, and in one form is in its solution treated/annealed state. A curable organic coating material is also provided. The method includes anodizing the article precursor, preferably in chromic acid solution and without chemical sealing during anodizing, applying the organic coating material to the aluminum-alloy article precursor, and precipitation heat-treating the coated aluminum article precursor to its final heat-treated state, thereby simultaneously curing the organic coating. If the aluminum alloy temper is of the naturally aging type, it is optionally lightly deformed prior to precipitation treatment aging. The approach may also be applied to articles that are not solution treated/annealed and aged, by first overly deforming the article precursor so that the curing treatment of the coating also partially anneals the article precursor to the final desired deformation state.
Abstract:
A stowage system particularly for space applications comprises a flight bag (10), a backpack (66), a backpack adapter plate (96), and a pressurized stowage rack (104). The flight bag (10) is fabricated of a Kevlar /Nomex fabric, and its lid (18) includes an integral transparent panel (22) so that the contents of the bag may be readily identifiable without opening the bag. Beneath the lid (18) is a payload restraint net (24) which is removably attached to the interior liner of the bag to restrain small stowage items. The mesh comprising the net preferably includes one or more access slits (28) for accessing the interior of the case without removing the net and thereby risking loss of contents from the bag. The flight bag (10) also includes a plurality of hook and loop (VELCRO ) patches (30) about its periphery so that it may be collapsed upon itself for storage when not in use, and may additionally be rafted or trained to other flight bags if desired. The backpack (66) of the inventive stowage system comprises various configurations and can accommodate up to four flight bags or some combination of unique payload and/or foam. Web straps (72, 74, 76, 80, 82, 86), integral to the bag's structure, attach the bag and its contents to the backpack adapter plate (96) via quick release buckles (98, 100). A clear longitudinal panel (102) on the lid (68) allows quick identification of backpack and flight bag contents.
Abstract:
A robot (13) is comprised of a platform (29), tendons (14, 15, 17, 19, 21, 23, 25 and 27) and a control unit (64). The platform (29) contains proximal reels (33, 35, 37, 39, 41, 43, 45 and 47) for the storage, retraction and extension of the tendons, with each tendon having a reel. Platform (29) also includes a master computer (65) for receiving commands from robot controls (78) and for responsively controlling and coordinating the operation of the reels. The distal ends of the tendons are anchored at separate locations. The robot (13) has a work space (73, 74) which is primarily determined by the location of the tendon anchors, although an expanded work space (75) can be obtained by having pairs of tendons cross each other in between the platform (29) and their distal anchor points. The platform (29) is translated and rotated in the work space by controlling the lengths of the tendons extending from their respective reels. When used with at least six tendons and reels, the platform (29) has six degrees of freedom: translation in three axes and rotation about each of the foregoing three axes.
Abstract:
Fixed parallel cargo rails (24, 26) are positioned on the cargo bed floor of an aircraft, spaced sufficiently to fit a pallet snugly therebetween. A plurality of colinear slots arranged along the length of the cargo bed floor are positioned just inboard of each rail. The slots are evenly spaced and oriented lengthwise with respect to the cargo bed floor. A dog (38) extends above the cargo bed floor from each slot and is adapted to engage a notch (36) in the cargo. While engaged, the dog is adapted to move along its slot, thereby moving the pallet lengthwise along the cargo bed floor. The pallet is passed bucket-brigade style from one dog to the next. Another aspect of the invention is the employment of movable cargo rails on the cargo ramp. The rails are slidable widthwise across the ramp within mounting slots, thus permitting the spacing between the rails to vary. The result is that loading cargo onto the ramp and aligning it with the fixed cargo rails on the cargo bed floor is made much easier.