A sliding cable driven crescent deployable cable net structure

Abstract

The application discloses a sliding cable driven crescent-shaped deployable cable net structure in the technical field of deployable structures and cable net structures, which comprises an inner ring end fixed node, an inner ring free node, an outer ring fixed node and three cables; the inner ring end fixed node and the inner ring free node are located on a first circular arc line; the outer ring fixed nodes are uniformly fixed on second and third circular arc lines and are symmetric about the plane where the first circular arc line is located and the normal plane of the line connecting the inner ring end nodes; a first cable passes through the nodes on the first circular arc line in sequence, a second cable alternately passes through the nodes on the second circular arc line and the nodes on the first circular arc line, and a third cable alternately passes through the nodes on the third circular arc line and the nodes on the first circular arc line; the lengths of the three cables are adjustable, the folding and unfolding of the cable net structure are realized, different building roof opening requirements are met, the structure composition and control mode are simple, and the structure has a high storage ratio.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of cable net structures and deployable structures, in particular to a crescent-shaped deployable cable net structure driven by sliding cables. BACKGROUND

[0002] The cable net structure is generated according to the concept of the tensegrity system proposed by Fuller, and a large number of prestressed cables are used, and the compression bars are few and short, so that the tensile strength of the steel can be fully utilized, and the structural efficiency is extremely high. This kind of structure form has become a hotspot in the academic field, and is also widely used in engineering. The structure has the advantages of light self-weight, low cost, beautiful appearance and the like, and becomes the roof building form of many large-span stadiums.

[0003] The research and application of the traditional cable net structure are mostly limited to the field of static building structures. In order to more effectively realize the opening degree control of the roof, the sliding cable device is used to replace the traditional cable form, the number of cable length controllers is reduced, and the crescent-shaped deployable cable net structure driven by sliding cables is provided. SUMMARY

[0004] The application aims to provide a crescent-shaped deployable cable net structure driven by sliding cables, which has a novel structure and can adjust the opening size.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the application is provided.

[0006] A crescent-shaped deployable cable net structure driven by sliding cables comprises inner ring end fixed nodes, inner ring free nodes, outer ring fixed nodes, first cables, second cables and third cables.

[0007] The inner ring end fixed nodes and the inner ring free nodes are located on a first circular arc line, the inner ring end fixed nodes are fixed at two ends of the first circular arc line, and the inner ring free nodes are arranged between the two inner ring end nodes; the outer ring fixed nodes are uniformly fixed on a second circular arc line and a third circular arc line, the outer ring fixed nodes located on the second circular arc line and the third circular arc line are symmetrical about the plane where the first circular arc line is located, and are symmetrical about the normal plane of the line connecting the inner ring end nodes;

[0008] The first cables pass through the nodes on the first circular arc line in sequence, the second cables pass through the nodes on the second circular arc line and the nodes on the first circular arc line alternately, and the third cables pass through the nodes on the third circular arc line and the nodes on the first circular arc line alternately, the lengths of the three cables are adjustable, and the folding and unfolding of the cable net structure are realized.

[0009] Further, the radian angle of the outer ring fixed nodes located at two ends of the second circular arc line and the third circular arc line is smaller than the radian angle of the inner ring end nodes.

[0010] Further, the radii of the second and third circular arc lines are greater than the radius of the first circular arc line.

[0011] Further, the number of outer ring fixed nodes on the second and third circular arc lines is p, the number of inner ring free nodes on the first circular arc line is p-1, and the number of inner ring end fixed nodes on the first circular arc line is 2.

[0012] Further, the three cables are each provided with a cable length adjusting device.

[0013] Further, three hinge points are provided at the inner ring end fixed node, and the two ends of the three cables are each hingedly connected to the inner ring end fixed node.

[0014] Further, pulley one is provided at the inner ring free node on the first circular arc line, pulley two and pulley three are symmetric about the plane of the first circular arc line, and pulley four is provided at the outer ring fixed node and faces the center of the first circular arc line.

[0015] Further, the first cable passes through pulley one of the inner ring free node on the first circular arc line, the second cable alternately passes through pulley four of the outer ring fixed node on the second circular arc line and pulley two of the inner ring free node on the first circular arc line, and the third cable alternately passes through pulley four of the outer ring fixed node on the third circular arc line and pulley three of the inner ring free node on the first circular arc line.

[0016] Further, the lengths of the second and third cables are increased, and the length of the first cable is shortened, so that the cable net structure is unfolded; the lengths of the second and third cables are shortened, and the length of the first cable is increased, so that the cable net structure is folded.

[0017] Further, the prestress of each point on the first cable is the same, and the prestress of each point on the second and third cables is the same.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1. The present application provides a sliding cable driven crescent-shaped deployable cable net structure, which is composed of a continuous cable and a pulley instead of a traditional segmented cable, uses a continuous sliding cable, and only needs to adjust the length of the cable to drive the deformation of the cable net structure, which is beneficial to reducing the complexity of the structure control and monitoring system and can also reduce the complexity of the cable and rod connection nodes.

[0020] 2. Since the structure can control the opening degree of the roof through the length of the cable, the adaptability in terms of use requirements is significantly enhanced, and the functionality of the structure is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the present application;

[0022] Figure 2 is a plan view of the present application;

[0023] Figure 3 is a plan view of the present application;

[0024] Figure 4 is a schematic view of the outer ring fixed node of the present application;

[0025] Figure 5 is a schematic view of the free node of the present application;

[0026] Figure 6 is a schematic view of the inner ring end fixed node of the present application;

[0027] Figure 7 is a schematic view of the change process when the inner ring angle is π of the present application;

[0028] Figure 8 is a schematic view of the change process when the inner ring angle is 1.5π of the present application;

[0029] In the figure: 1 - ring cable; 2 - upper diagonal cable; 3 - lower diagonal cable; 4 - outer ring top fixed node; 5 - outer ring bottom fixed node; 6 - inner ring end fixed node; 7 - inner ring free node. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the present application. It is true that the embodiments described below are only some of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Please refer to Figure 1The application is implemented as a sliding cable driven crescent deployable cable net structure, the whole structure has 3p+1 nodes, including p outer ring top fixed nodes 4, p outer ring bottom fixed nodes 5, 2 inner ring end fixed nodes 6, p-1 inner ring free nodes 7, a total of 4 kinds of nodes, wherein the inner ring end fixed nodes 6 and the inner ring free nodes 7 are located on the first circular arc line, the inner ring end fixed nodes 6 are fixed at both ends of the first circular arc line, and the inner ring free nodes 7 are arranged between the two inner ring end nodes; the outer ring top fixed nodes 4 and the outer ring bottom fixed nodes 5 are the same structure, the two kinds of nodes are respectively fixed on the second circular arc line and the third circular arc line, and the outer ring top fixed nodes 4 and the outer ring bottom fixed nodes 5 are symmetrical about the plane where the first circular arc line is located and symmetrical about the normal plane of the inner ring end node connecting line; the radian angle of the outer ring fixed nodes located at both ends of the second circular arc line and the third circular arc line is smaller than the radian angle of the inner ring end node, for example Figure 2 As shown in the figure, the radian angle of the inner ring end node is θ=π, and the radian angle of the outer ring fixed nodes located at both ends of the second circular arc line and the third circular arc line is smaller than π.

[0032] The structure has three groups of cables, in order to facilitate the description, the first cable, the second cable and the third cable are defined as ring cable, upper inclined cable and lower inclined cable, wherein the ring cable is divided into p sections by the p-1 inner ring free nodes 7, the upper inclined cable is divided into 2p sections by the p outer ring top fixed nodes 4 and the p-1 inner ring free nodes 7, and the lower inclined cable is divided into 2p sections by the p outer ring bottom fixed nodes 5 and the p-1 inner ring free nodes 7.

[0033] The ring cable passes through the nodes on the first circular arc line in turn, the upper inclined cable alternately passes through the nodes on the second circular arc line and the nodes on the first circular arc line, and the lower inclined cable alternately passes through the nodes on the third circular arc line and the nodes on the first circular arc line, the prestress of each point on each cable is the same, the lengths of the three cables can be adjusted through the cable length adjusting device to realize the folding and unfolding of the cable net structure.

[0034] In the initial state, each group of nodes is uniformly distributed on the circular arc line where it is located, the nodes located in the middle of the ring cable are connected by a movable pulley, and the nodes located at both ends of the ring cable are connected in a hinged manner; two groups of inclined cables are connected by a fixed pulley at the outer ring node and by a movable pulley at the inner ring node.

[0035] As shown in Figure 2 and Figure 3 , 3p+1 nodes can be obtained by rotating the initial 3 nodes to obtain the initial coordinates of 3p+1 nodes. The specific calculation process is as follows:

[0036] The node matrix N of the unit composed of the initial 3 nodes u,0 (u=1, 2, 3):

[0037] N 1,0= T1*[r 0 h1]

[0038] N 2,0 = T2*[R 0 h2]

[0039] N 3,0 = T2*[R 0 h3]

[0040] Wherein, R is the outer ring radius (i.e. the radius of the second and third circular arc lines), r is the inner ring radius (i.e. the radius of the first circular arc line), h2, h3 are the reference heights relative to the reference plane h1, taking the horizontal plane where the inner ring is located as the reference plane h1, i.e. h1=0, so as to set the relative heights of the two groups of outer rings; T1, T2 are rotation matrices, as follows:

[0041]

[0042]

[0043] Wherein, θ is the structure form control parameter, when the structure is a semicircle, the value is θ=π; when the structure is a 3 / 4 circle, the value is θ=1.5π.

[0044] The node coordinate matrix of other node units is:

[0045]

[0046]

[0047]

[0048] Wherein, i is the number of node units, i=1, 2, …, p; for N 1,i When calculating, i=[0, p]; for N 2,i When calculating, i=[0, p-1]; for N 3,i When calculating, i=[0, p-1]; thus 3p+1 node positions are obtained. T3 is a rotation matrix, as follows:

[0049]

[0050] As shown in Figures 2-3 , the nodes are respectively located on three semicircle rings, the nodes on the outer two groups of semicircle rings are fixed nodes, the two end nodes on the inner semicircle ring are fixed nodes, and the total number of fixed nodes is 2p+2; the other nodes on the inner semicircle ring are free nodes, and the total number of free nodes is p-1.

[0051] In one specific embodiment of the present application, the structure design of the two groups of outer ring fixed nodes is as shown in Figure 4 , and the structure design of the free nodes is as shown in Figure 5As shown in the figure, the structure design of the fixed nodes on both sides of the inner ring is as follows Figure 6 As shown in the figure.

[0052] As shown in the figure Figure 4 As shown in the figure, the outer ring fixed node is provided with a pulley towards the center position of the first circular arc line, named pulley four.

[0053] As shown in the figure Figure 5 As shown in the figure, three pulleys are arranged at the inner ring free nodes, and are sequentially named pulley one, pulley two and pulley three. The pulley one is located on the plane of the first circular arc line, and the pulley two and the pulley three are symmetrical about the plane of the first circular arc line.

[0054] As shown in the figure Figure 6 As shown in the figure, three hinge points are arranged at the end fixed nodes of the inner ring, and the two ends of the three cables are hinged with the end fixed nodes of the inner ring.

[0055] The loop cable passes through the pulley one of the inner ring free node located on the first circular arc line in sequence; the upper cable passes through the pulley four of the outer ring fixed node located on the second circular arc line and the pulley two of the inner ring free node located on the first circular arc line alternately; and the lower cable passes through the pulley four of the outer ring fixed node located on the third circular arc line and the pulley three of the inner ring free node located on the first circular arc line alternately.

[0056] The working principle of the present application is that the structure has three cables, and each point in the same cable has the same prestress. Each cable contains a length adjusting device for adjusting the cable length, so as to realize the opening size of the structure, and the opening and closing degree of the whole structure can be controlled by the unfolding coefficient, so as to realize the folding and unfolding of the cable net structure. As shown in the figure Figure 7 During the unfolding process, the length of the upper and lower inclined cables increases, and the length of the loop cable decreases; during the folding process, the length of the upper and lower inclined cables decreases, and the length of the loop cable increases.

[0057] On the basis of the above description, the coefficient of θ can be changed to meet the structural form under different conditions, such as when θ is 1.5π, the structural form is 3 / 4 circle, as shown in the figure Figure 8

[0058] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.​

Claims

1. A crescent-shaped deployable cable net structure driven by a sliding cable, characterized in that, It includes an inner ring end fixed node (6), an inner ring free node (7), an outer ring fixed node, a first cable, a second cable, and a third cable; The inner ring end fixed node and the inner ring free node are located on the first arc line. The inner ring end fixed node is fixed at both ends of the first arc line, and the inner ring free node is arranged between the two inner ring end nodes. The outer ring fixed nodes are uniformly fixed on the second arc line and the third arc line. The outer ring fixed nodes located on the second arc line and the third arc line are symmetrical about the plane where the first arc line is located, and are symmetrical about the normal plane of the line connecting the inner ring end nodes. The radii of the second and third arcs are greater than the radius of the first arc; The first cable passes through the nodes on the first arc in sequence, the second cable passes through the nodes on the second arc alternately and the nodes on the first arc alternately, and the third cable passes through the nodes on the third arc alternately and the nodes on the first arc alternately. The lengths of the three cables are adjustable, enabling the folding and unfolding of the cable net structure.

2. The crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, The radian angle of the outer ring fixed node located at both ends of the second and third circular arcs is smaller than the radian angle of the inner ring end node.

3. The crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, The number of fixed nodes in the outer ring located on the second and third circular arcs is p, and the number of free nodes in the inner ring located on the first circular arc is p-1.

4. The crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, All three cables are equipped with cable length adjustment devices.

5. A crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, Three hinge points are provided at the fixed node at the end of the inner ring, and both ends of the three cables are hinged to the fixed node at the end of the inner ring.

6. A crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, The inner ring free node (7) is provided with pulley one, pulley two and pulley three. Pulley one is located in the plane of the first arc line, and pulley two and pulley three are symmetrical about the plane of the first arc line. The outer ring fixed node is provided with pulley four facing the center of the first arc line.

7. A crescent-shaped deployable cable net structure driven by a sliding cable according to claim 6, characterized in that, The first cable passes sequentially around pulley one at the inner ring free node (7) on the first arc; the second cable passes alternately around pulley four at the outer ring fixed node on the second arc and pulley two at the inner ring free node (7) on the first arc; the third cable passes alternately around pulley four at the outer ring fixed node on the third arc and pulley three at the inner ring free node (7) on the first arc.

8. A crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, Increase the length of the second and third cables, shorten the length of the first cable, and the cable net structure unfolds; The lengths of the second and third cables are shortened, and the length of the first cable is increased, resulting in a folded cable net structure.

9. A crescent-shaped deployable cable net structure driven by a sliding cable according to claim 1, characterized in that, The prestress is the same at all points on the first cable, and the prestress is the same at all points on the second and third cables.

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