33results about How to "Meet the rigidity requirements" patented technology

The invention provides a double-layer annular truss antenna mechanism based on passive drive and relates to double-layer annular truss type expandable antenna mechanisms. The problems that an existing large-caliber single-ring annular truss antenna is small in rigidity, the use rigidity requirement can not be met, an existing annular truss antenna mechanism is complex in drive structure and large in weight, inhaul cables are prone to be twisted after being used for unfolding the mechanism, and the unfolding reliability is low are solved. The double-layer annular truss antenna mechanism comprises multiple inner and outer truss foldable unit modules, multiple inner transition folding assemblies and multiple outer transition folding assemblies. Each inner and outer truss foldable unit module comprises an inner folding unit module, an outer folding unit module and two inner and outer connection truss assemblies. Inner supporting vertical rods and outer supporting vertical rods which are opposite are connected through the inner and outer connection truss assemblies. After the inner and outer truss foldable unit modules are unfolded, an inner and outer double-layer annular truss polyhedron is formed. The double-layer annular truss antenna mechanism is used for a satellite, a space station and a space probe.

The invention discloses a measurement method for the influence of residual stress on bolt connection structure clamping force attenuation. A device for realizing the method includes: a tensile testingmachine, a lower connecting piece, a nut, an eddy current displacement sensor, an upper connecting piece, a bolt, a pressure sensor, and a corresponding sensor data acquisition system and a computer,a 3D surface morphology measurement instrument, a digital display torque wrench, a vibration table, and an X ray residual stress tester. The 3D surface morphology measurement instrument is employed to acquire the three-dimensional morphology of a contact surface, vibratory stress relief process and the X ray residual stress tester are employed to acquire bolts that are made of a same material andhave different levels of residual stress, the tensile testing machine, the pressure sensor and the displacement sensor are combined to collect the data under the circumstances of a same pretighteningforce and specific amplitude circulating alternating load. The method can achieve quantitative analysis of the relationship between the two structures, provides the experimental basis for further study of the influence of residual stress on bolt connection structure clamping force attenuation, and has the characteristics of simple and quick operation and accurate measurement.

A cable-stayed stretch-draw annular expandable antenna mechanism relates to an expandable antenna mechanism and solves the problem that an existing annular truss mechanism has a decrease in stiffnesswith an increase in the diameter of an antenna, cannot meet the stiffness requirements and has a complicated driving mechanism, a large weight and low expansion reliability. The cable-stayed stretch-draw annular expandable antenna mechanism comprises a plurality of cable-stayed stretch-draw expandable unit modules. Each of the cable-stayed stretch-draw expandable unit modules comprises a first expandable unit module and a second expandable unit module which are connected together. The plurality of first expandable unit module and the plurality of second expandable unit modules are arranged alternately and connected together to form a cable-stayed stretch-draw annular truss after expanded. The cable-stayed stretch-draw annular expandable antenna mechanism is good in reliability, compact instructure, light in weight, easy to drive, high in stiffness after fully expanded, meets the requirements for a large-diameter antenna, and is applied to a communication satellite, a space station anda space detector.

The invention discloses a test device for measuring double bolt relaxation under tangential alternating load, which belongs to the field of mechanical engineering and mechanics. The device has the advantages that the structure is simple; the price is low; the bolt relaxation can be reflected through measuring attenuation of axial tightening forces of the double bolts; influences on the bolt relaxation by the interaction between the double bolts and the joint surface tangential displacement changes are also considered; the test precision for measuring the tangential relaxation of the double bolts and the data accuracy are improved; and the sensitivity is high, and the response speed is quick. The device comprises an upper connector, pre-buried strain gauge bolts, an eddy current transducerand a lower connector. The pre-buried strain gauge bolts with higher precision are adopted, and the data can be outputted in real time and saved; and the high-precision loading and the frequency control on a tensile test machine are also combined, and the data accuracy is ensured. A large amount of accurate data are provided for follow-up analysis, and the measurement precision is improved. The device reflects the interaction between the double bolts through the pre-tightening force changes and different relaxation curves of the double bolts during tightening and loading processes.

The invention discloses a hybrid scissors-forks type extensible antenna mechanism of a double-layer ring-shaped truss. The hybrid scissors-forks type extensible antenna mechanism mainly comprises an inner-layer ring-shaped truss assembly, an outer-layer ring-shaped truss assembly, a central fixed scissors type connecting assembly and a central movable scissors type connecting assembly, wherein theinner-layer ring-shaped truss assembly comprises n inner-layer folding and stretching units; the outer-layer ring-shaped truss assembly comprises 2n outer-layer folding and stretching units; the central fixed scissors type connecting assembly comprises n fixed scissors type folding and stretching units and n/2 central movable scissors type folding and stretching units; upper and lower four inner-layer disk chucks at the two sides of the inner-layer folding and stretching units and upper and lower six outer-layer disk chucks of corresponding two outer-layer folding and stretching units definethe double-layer ring-shaped truss mechanism through two central fixed scissors type folding and stretching units and one central movable scissors type folding and stretching unit. The hybrid scissors-forks type extensible antenna mechanism is simple in implementation way, is high in reliability, has the advantages of being flexible in movement and relatively great in folding, and can be applied to a communication satellite, a space station and a space detector.

The invention provides a high-folding-unfolding-ratio double-layer annular unfoldable antenna mechanism based on straight quadrangular units. The high-folding-unfolding-ratio double-layer annular deployable antenna mechanism comprises a plurality of same straight quadrangular units, each straight quadrangular unit is formed by fixedly connecting an upper-layer unfoldable module and a lower-layer unfoldable module which are in mirror symmetry through four connecting rods, and the plurality of adjacent straight quadrangular units are networked; every two adjacent straight quadrangular units share a first faceplate, a first connecting block and a first connecting rod. The sequential connection lines of the central points of all the first connecting rods form a regular polygon, and a third faceplate and a fourth faceplate on the same layer of every two adjacent straight quadrangular units are connected through a series chain comprising three parallel revolute pairs and two equal-length rods. The mechanism has the beneficial effects that joint parts are connected through revolute pairs, so that the cold welding phenomenon of the mechanism during the moving process is reduced; the straight quadrangular units have the advantages of being high in stability, large in folding-unfolding ratio and high in rigidity and being easy to assemble.

The invention discloses a load projection and mapping method for importing press forming information to a finite element simulation model. The method includes the following steps that node force information of a sheet is positioned, projected and mapped to a die profile grid twice during press forming; load information on the die profile grid is transmitted to a model tetrahedron unit, and node action forces of the sheet are directly applied to a die so as to replace the action of the sheet on the die. The method achieves force transmission between the sheet and the die during press forming, has an important theoretical guiding significance and application value in vehicle press forming die structural analysis, belongs to the technical field of vehicles, solves the problem of how to quickly and accurately project and map the press forming information of the sheet to the finite element simulation model in the prior art, and achieves load projection and mapping between node action forces of different grid models.

The invention discloses a scissor-like frame linkage over-constraint double-layer annular truss deployable antenna mechanism which mainly comprises an inner annular truss component, an outer annular truss component and an inner and outer truss connecting component. The inner annular truss component comprises n inner folding and unfolding units, two adjacent inner folding and unfolding units are connected through an upper inner flower disc and a lower inner flower disc which are shared, the outer annular truss component comprises 2n outer folding and unfolding units, two adjacent outer foldingand unfolding units are connected through an upper outer flower disc and a lower outer flower disc which are shared, the inner and outer truss connecting component comprises 2n middle folding and unfolding units, the inner annular truss component and the outer annular truss component are concentrically arranged, and the upper inner flower disc and the lower inner flower disc of each side of each inner folding and unfolding unit are connected with the upper outer flower disc and the lower outer flower disc of each side of the corresponding outer folding and unfolding unit through the middle folding and unfolding units. The antenna mechanism has the advantages of high stiffness and reliability and simple structure and is applied to communication satellites, space stations and space detectors.

The invention relates to a conical single-layer annular truss deployable antenna mechanism driven by torsional springs. The conical single-layer annular truss deployable antenna mechanism comprises Nisosceles trapezoid folding and unfolding units, wherein N>=3. The structure of the isosceles trapezoid folding and unfolding units are completely the same, and the adjacent folding and unfolding units are connected through shared inclined rods and upper and lower corner hinges to form a regular N-polygon annular truss; and each trapezoidal folding and unfolding unit comprises chord members, a crank rod piece, a torsion spring driving assembly, an inclined rod, a corner sliding block assembly and a corner hinge, and the chord members comprise the upper chord member and the lower chord member.According to the annular truss structure with the taper, the overall structural rigidity is not lower than that of a columnar annular truss structure under the conditions of the same caliber and the same mass, the rigidity is high, and the using rigidity requirement of a space large-caliber deployable antenna can be met.

The invention relates to a horizontal type VPX module debugging device comprising a horizontal type VPX module mounting rack, a VPX module interface board power supply and control adapter board and aconnecting cable, wherein the horizontal type VPX module mounting rack comprises bottom plate and an open type top plate, four cushion blocks are installed below the bottom plate and used for supporting the bottom plate, a pair of guide rails, an upper cross beam and a lower cross beam are installed between the bottom plate and the open type top plate, the guide rail is used for guiding insertionand extraction of the VPX module and fixing an upper guide pin and a lower guide pin thereof, and the upper and lower cross beams and built-in nut strips are used for mounting and fixation of the guide rails and locking and starting of an upper handle and a lower handle of the VPX module; the VPX module interface board is vertically mounted on the rear portion of the horizontal type VPX module mounting rack; and the power supply and control adapter board is horizontally mounted on the bottom plate of the horizontal type VPX module mounting rack. According to the horizontal type VPX module debugging device in the invention, horizontal placement of the VPX module is realized, one-time insertion and extraction is only required for one-time debugging, operations such as index tuning, fault removal, component replacement and the like during debugging are facilitated, and the mechanical service life of the VPX interface is guaranteed.

The invention provides a torsional spring driven shear-hinge ring rib type deployable antenna mechanism, which comprises radial deployable units and circumferential deployable units, each radial deployable unit comprises an inner faceplate, a first shear-fork rod, a second shear-fork rod, a third shear-fork rod and an outer faceplate, and the radial deployable units are arranged on the outer side of the inner faceplate in a circumferential array manner; the radial deployable units are connected with the circumferential deployable units through the outer disc chucks, the circumferential deployable units are sequentially connected end to end through the outer disc chucks, each circumferential deployable unit comprises a folding rod and a torsional spring driving assembly, and the folding rods are connected through the torsional spring driving assemblies. By adjusting the number of the radial deployable units and the circumferential deployable units and the lengths of the scissor rods and the folding rods forming the units, the deployable antenna mechanism with any caliber is formed, and the deployable antenna mechanism has the advantages of being good in manufacturability, high in rigidity, large in folding ratio and the like; the problems that an existing deployable antenna is complex in mechanism, low in reliability, poor in rigidity and strength and the like are solved, and the antenna can be better applied to communication satellites, space stations and space detectors.