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Large single-K node triangular truss stiffening ring and integrated tension application method

A triangular, stiffening ring technology, applied in the fuselage frame, aerospace aircraft, transportation and packaging, etc., can solve the problems of difficult ring truss, inconsistent configuration, and direct force transmission, and achieves improved load-bearing deformation capacity, Effects that are easy to make and assemble, and easy to integrate

Active Publication Date: 2019-11-01
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many studies on composite truss structures at this stage, such as IsoTruss TM Structure, continuous longitudinal rods, helical inclined rods form an equilateral triangle, conceptually it can form a linear truss with excellent mechanical properties, but the configuration is very complicated, it needs to be wound and braided as a whole, and it is difficult to realize a large-scale, large-bearing structure; all-composite Material truss structure—triangular cross-section composite material overall truss structure, the core of which needs to be prepared by overall winding of fibers, and a 6m long truss has been prepared, and load-bearing tests have been carried out, but it is difficult to be used for large-scale ring trusses; the patent "a large-scale stiffening Ring-spliced ​​triangular truss (CN201910275698.0)", invented a thin-walled tube truss made of stiffened ring composite material, the truss has a triangular cross-section, has double K nodes and single K nodes, and the double K nodes are single K nodes with a number of 2 times
The manufacturing process of double K joints is still relatively complicated. One side of the outer chord is a single K joint, and one side is separated by single K and double K. The configuration is inconsistent and the force is asymmetrical; the triangular connecting plate structure of the segmental module has low efficiency and heavy weight ;The connection of the hub shaft is complex, the force transmission is not direct, the number of components and nodes is large, and the weight is large; the tension is directly integrated through the radial tie rod, and the tension is adjusted and controlled, requiring a large number of tooling and tensioning equipment, and the tension application and control process is relatively complicated.
[0004] Therefore, those skilled in the art are committed to developing a stiffening ring structure with consistent configuration, simple node fabrication, simple and effective integration and tension application, and solve the existing problems of heavy weight, complex configuration, difficult fabrication, low stiffness, Complex and difficult problems of tension application

Method used

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  • Large single-K node triangular truss stiffening ring and integrated tension application method
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  • Large single-K node triangular truss stiffening ring and integrated tension application method

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Embodiment 1

[0037] Such as figure 1 Shown is a three-dimensional diagram of a large single K-node triangular truss stiffening ring in a preferred embodiment of the present invention, including a single K-node triangular truss ring 1 , an integrated central hub 2 and radial tie rods 3 . Among them, the single K-node triangular truss ring is spliced ​​by n standard segments, n is a multiple of 4, and the ring is 1 / 4 symmetrical.

[0038] The ring 1 of the single K-node triangular truss is an equilateral triangular truss, and the side length of the equilateral triangle is a. Take: the diameter of the outer ring of the single K-node triangular truss ring 1 is D 1 , the diameter of the inner ring is D 2 , then: the outer arc length L of the standard segment 1 = πD 1 / n, inner arc length L 2 = πD 2 / n.

[0039] In the embodiment, there are 2n radial tie rods 3, evenly arranged in the circumferential direction, in a spindle shape, unidirectional parallel high-performance carbon fiber twis...

Embodiment 2

[0041] figure 1 It is a three-dimensional diagram of a large single K-node triangular truss stiffening ring in a preferred embodiment of the present invention, including a single K-node triangular truss ring 1 , an integrated central hub 2 , and radial tie rods 3 . Among them, the single K-node triangular truss ring is spliced ​​by n standard segments, n is a multiple of 4, and the ring is 1 / 4 symmetrical.

[0042] The ring 1 of the single K-node triangular truss is an isosceles triangular truss, and the minimum angle of the isosceles triangle is not less than 45°. Take: the diameter of the outer ring of the single K-node triangular truss ring 1 is D 1 , the diameter of the inner ring is D 2 , then: the outer arc length L of the standard segment1 = πD 1 / n, inner arc length L 2 = πD 2 / n.

[0043] In the embodiment, there are 2n radial tie rods 3, evenly arranged in the circumferential direction, in a spindle shape, unidirectional parallel high-performance carbon fiber t...

Embodiment 3

[0045] Such as figure 2 Shown is a three-dimensional perspective view of a standard segment of a preferred embodiment of the present invention. The standard segment consists of 2 outer chords 101, 1 inner chord 102, and 6m web rods 103, which are spliced ​​by 3m single K-shaped nodes 104. The two ends of the standard segment are reference triangle frames 105, and each abdominal The rod 103 is in a spiral shape along one direction, and m is the equivalence point of the standard segment.

[0046] In the embodiment, the single K-shaped joint 104 is a molded standard joint, which is a 4-way casing joint or a connecting plate joint, and is formed by using carbon fiber reinforced epoxy resin composite material and prepreg three-dimensional braided layup;

[0047] The inner chord 102, the web rod 103, and the outer chord 101 are ultra-thin-walled tubes with a diameter-to-thickness ratio of 80. The relevant calculations are as follows:

[0048] Selection: the diameter of the outer ...

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Abstract

The invention discloses a large single-K node triangular truss stiffening ring. The stiffening ring is characterized by comprising a single K node triangular truss circular ring, an integrated centralhub and radial pull rods, wherein the single K node triangular truss circular ring is connected with the integrated central hub through the radial pull rods; the single-K node triangular truss circular ring is formed by splicing N standard sections, wherein each standard section comprises an outer chord tube, an inner chord tube, a web rod tube, a single K node and a reference triangular frame; the integrated central hub comprises a hub shaft tube and a hub plate node; and the 2 n radial pull rods are uniformly arranged around the integrated central hub in a spindle-shaped annular direction.The invention further provides an integrated tension application method of the large single-K node triangular truss stiffening ring. According to the stiffening ring and the method, the overall rigidity, the load deformation capability and the stability of a composite material truss can be improved, and the composite material truss can be applied to a large aircraft structure and an aerospace space assembly type platform.

Description

technical field [0001] The invention relates to the technical field of composite material structures, in particular to a large-scale single K-node triangular truss stiffening ring and an integrated tension applying method. Background technique [0002] Composite materials have the characteristics of light weight, high strength, high rigidity, fatigue resistance, designability and manufacturability, and are widely used in aerospace and modern industrial fields. In the field of aviation, the proportion of composite material structures continues to increase. At present, the proportion of foreign advanced aircraft has exceeded 40%, and it has become the core technical index to measure the advanced nature of aircraft. In large satellite platforms, space station platforms, orbital probes, and modern airship structures, such as stratospheric airships, high-altitude solar drones, etc., composite truss structures or composite structures are also used. [0003] There are many studies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/22B64C1/06B64F5/00
CPCB64G1/22B64C1/061B64F5/00
Inventor 陈务军胡建辉徐建东杨钧
Owner SHANGHAI JIAO TONG UNIV
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