Large-bearing rotary table suitable for ultrahigh antenna framework

Abstract

The invention discloses a large-bearing turntable suitable for an ultrahigh antenna skeleton, which is characterized by comprising a rotating platform, a working bin and a ground foundation, a central pivot is arranged in the center of the rotating platform; the bottom of the central pivot is rotationally connected with the ground foundation, and the top is fixedly connected with the antenna skeleton to form a first main force transmission path of the turntable; the bin body framework of the working bin uniformly surrounds the central pivot and is fixedly connected with the central pivot; a roller assembly of the rotating platform is connected with the end part of the bin body framework to form a second main force transmission path of the rotating platform; the roller assembly can move along the track on the ground foundation; and the bearing performance of the structure in the first main force transmission path and the bearing performance of the structure in the second main force transmission path are balanced. By means of the large-bearing-capacity rotary table suitable for the ultrahigh antenna framework, the anti-overturning capacity of the rotary table can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radar antennas, and specifically to a large-load-bearing turntable suitable for an ultra-high antenna frame. Background Art

[0002] The large turntable of a large fixed-station radar generally has the functions of an equipment cabin, a command cabin, and other personnel operating rooms. The turntable platform has a large outer diameter and is heavy. In order to meet its azimuth rotation, a wheel-rail design is generally adopted, which can greatly reduce the complexity of the transmission system and reduce the design and manufacturing costs. The turntable is generally composed of a turntable platform, a main support frame, a bottom roller group, and a track. The support frame is connected to the bottom roller group to ensure the rigidity of the entire turntable. The bottom roller group can be selected in different quantities and positions according to design requirements. The platform rotation is driven by the motor of the bottom roller group, and the entire turntable rotates along the track.

[0003] The turntable of the existing technology is mainly used for large-scale ground equipment of relatively low height. Its anti-overturning depends on the ground support force of the roller group. The anti-overturning moment is related to the wheel-rail diameter. For equipment with a higher antenna frame above the turntable, the center height of the equipment exceeds the wheel-rail radius, which is easy to cause structural damage or even equipment overturning under strong wind conditions in the wild. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve the problem that the existing turntable is mainly used for large-scale ground equipment with relatively low height and has poor anti-overturning ability.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A large load-bearing turntable suitable for an ultra-high antenna frame includes a rotating platform 100, a working chamber 200 and a ground foundation 300; a central pivot 110 is arranged at the center of the rotating platform 100;

[0007] The bottom of the central pivot 110 is rotatably connected to the ground foundation 300, and the top is fixedly connected to the antenna frame 400, forming a first main force transmission path of the turntable;

[0008] The warehouse frame 210 of the working warehouse 200 is evenly arranged around the central pivot 110 and fixedly connected thereto; and the roller assembly 120 of the rotating platform 100 is connected to the end of the warehouse frame 210 to form a second main force transmission path of the turntable; and the roller assembly 120 can move along the track on the ground foundation 300;

[0009] Furthermore, the structural bearing performance in the first main force transmission path and the second main force transmission path is balanced.

[0010] Advantages: The present invention adopts an over-constrained wheel-rail-bearing combined turntable design, which is based on a stiffness matching design to achieve wheel-rail drive while optimizing the anti-overturning force transmission path and improving the turntable's anti-overturning ability.

[0011] In one embodiment of the present invention, the main beam structure of the rotating platform 100 is fixedly connected to the central pivot 110 and the warehouse frame 210 .

[0012] In one embodiment of the present invention, the roller assembly 120 is connected to the end of the bin frame 210 by using an adjustment base; and the bin frame 210 adopts a multi-partition design.

[0013] In one embodiment of the present invention, in order to achieve a balance in the structural bearing performance in the first main force transmission path and the second main force transmission path, a stiffness matching optimization design method based on key parameters is used to perform structural optimization, including the following steps:

[0014] According to the function of the turntable, an initial geometric model of the central pivot and the warehouse frame is established, and an initial finite element optimization model is established according to the initial geometric model;

[0015] S200, determining the load distribution target of the central pivot and the warehouse frame according to the mechanical analysis working condition;

[0016] S300, determining design variables according to the first main force transmission path and the second main force transmission path;

[0017] S400, obtaining an optimization target according to the load distribution target and the design variables; and analyzing the initial finite element optimization model according to the optimization target to obtain an initial discrete variable matrix of the optimization target;

[0018] S500, iteratively updating the initial finite element optimization model according to the initial discrete variable matrix to obtain a response matrix of the optimization target;

[0019] S600, using the least square method to perform optimal data fitting on the initial discrete variable matrix and the response matrix to obtain a response surface function model of the optimization target;

[0020] S700, determines the optimal design variable values ​​according to the response surface function model, updates the initial geometric model according to the optimal design variable values, and verifies it using finite element analysis, thereby achieving a reasonable distribution of the turntable's bearing performance.

[0021] In one embodiment of the present invention, the load distribution target includes: the bottom support force N1 of the central pivot 110, and the support force N2 of the connection position between the warehouse frame 210 and the roller assembly 120; the design variables include: the wall thickness V1 of the central pivot 110, the thickness V2 of the internal longitudinal reinforcement 211 of the warehouse frame 210, the thickness V3 of the internal transverse reinforcement 212 of the warehouse frame 210, and the thickness V4 of the steel plate of the outer skin 213 of the warehouse frame 210.

[0022] In one embodiment of the present invention, when the bottom support force N1 of the central pivot 110 is selected as the optimization target, the optimization target is: N1(V i )=(1±C)F1; wherein, i=1, 2, 3, 4; C is the allowable deviation coefficient; F1 is the support force designed for the bottom of the central pivot.

[0023] In one embodiment of the present invention, obtaining the initial discrete variable matrix of the optimization objective includes:

[0024] S410, if N1<(1-C)F1, the initial discrete variable matrix V obtained is:

[0025] S420, if N1<(1-C)F1, the initial discrete variable matrix V obtained is:

[0026] Among them, t is the discrete change.

[0027] In one embodiment of the present invention, the response surface function model with the bottom support force N1 of the central pivot 110 as the optimization target is: Where k0 is the fitting constant; k i is the response coefficient of the i-th design variable; V i is the ith design variable.

[0028] In one embodiment of the present invention, based on the target constraints between the bottom support force N1 of the central pivot 110 and the support force N2 at the connection position between the warehouse frame 210 and the roller assembly 120, as well as the stress constraints of the entire turntable system, a response surface function model of the support force N2 at the connection position between the warehouse frame 210 and the roller assembly 120 is obtained; and the initial geometric model is updated using the response surface function model of the two force distribution targets.

[0029] In one embodiment of the present invention, the target constraint condition is: stN1+N2=F2; the stress constraint condition is: max (x i )≤230MPa,x i ∈D; where F2 is the total bearing capacity of the turntable; x i are the nodes at each position of the finite element model, D is the entire model domain; Smax is the maximum stress.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is applicable to ultra-high antenna frames, has a large turntable structure with strong anti-overturning ability, and adopts a central pivot bearing combination + surrounding roller parts ground support to achieve a high reliability design.

[0031] The first main force transmission path of the present invention effectively transmits the load of the antenna frame on the top of the turntable to the ground through the center position, and the bearing seat at the connection between the center pivot and the ground foundation is connected to the ground by anchor bolts embedded in a cement seat, which greatly improves the overall stiffness and firmness of the antenna frame.

[0032] The second main force transmission path of the present invention connects the main bearing beam of the turntable platform to the warehouse frame by welding, so that the turntable's own load is evenly transmitted to the ground foundation through the second main force transmission path, ensuring the stable driving of the roller assembly.

[0033] The structural stiffness matching optimization design method based on target load adjustment is adopted. By determining the target load distribution, adjusting the structural design parameters, and the specific process of finite element simulation verification, it is ensured that the strength of the final main load-bearing structure meets the material design requirements, the stiffness meets the accuracy requirements, and the load-bearing design of the center pivot and roller assembly is reasonable.

[0034] In the structural stiffness matching optimization design method adopted, the fitting calculation efficiency and the accuracy of the optimization results are improved through the discrete design variable unidirectional control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a large load-bearing turntable suitable for an ultra-high antenna frame according to an embodiment of the present invention.

[0036] Figure 2 Schematic diagram of the central pivot and warehouse frame of an embodiment of the present invention.

[0037] Figure 3 Schematic diagram of a roller assembly according to an embodiment of the present invention.

[0038] Figure 4 The present invention is a flowchart of structural optimization of the stiffness matching optimization design method of the turntable according to the embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] See also Figures 1 to 3 As shown, the present invention provides a large load-bearing turntable suitable for an ultra-high antenna frame, comprising a rotating platform 100, a working chamber 200 and a ground foundation 300. A central pivot 110 is arranged at the center of the rotating platform 100, the bottom of the central pivot 110 is rotatably connected to the ground foundation 300, and the top is fixedly connected to the antenna frame 400, forming a first main force transmission path of the turntable. The warehouse frame 210 of the working chamber 200 evenly surrounds the central pivot 110 and is fixedly connected thereto, and the roller assembly 120 of the rotating platform 100 is connected to the end of the warehouse frame 210, forming a second main force transmission path of the turntable, and the roller assembly 120 can move along the track on the ground foundation 300. Among them, the structural load-bearing performance in the first main force transmission path and the second main force transmission path is balanced.

[0042] See also Figures 1 to 3 As shown, in one embodiment of the present invention, the bottom of the central pivot 110 is connected to the ground foundation 300 by a bearing, and the top is directly connected to the antenna frame 400 by a flange, so as to construct the first main force transmission path of the main structure, that is, directly transmitted to the ground foundation 300 through the central pivot 110. The central pivot 110 is welded to the warehouse frame 210 on all sides. The warehouse frame 210 adopts a multi-partition design, and the density and distribution of the plate are optimized based on the load conditions to ensure the rigidity of the structure. The main beam structure of the rotating platform 100 is welded to the central pivot 110 and the box warehouse frame 210 to ensure the load-bearing safety of the main working area.

[0043] The roller assembly 120 is connected to the end of the warehouse frame 210 by an adjustment base, thereby constructing a second main force transmission path of the main structure, that is, from the warehouse frame 210 and the roller assembly 120 to the ground foundation 300. Among them, the roller assembly 120 has its own drive motor to control the azimuth rotation of the entire turntable.

[0044] See also Figures 1 to 4 As shown, in this embodiment, there are two main force transmission paths. In order to balance the structural bearing performance, a stiffness matching optimization design method based on key parameters is used to optimize the structure, including the following steps:

[0045] S100, establishing an initial geometric model of the central pivot and the warehouse frame according to the turntable function, and establishing an initial finite element optimization model according to the initial geometric model.

[0046] In this embodiment, the geometric model and the finite element optimization model are established in the ANSYS platform, for example.

[0047] S200, determining the load distribution target of the central pivot and the warehouse frame according to the mechanical analysis working condition.

[0048] In this embodiment, the load distribution targets include: the bottom support force N1 of the central pivot 110 and the connection position support force N2 of the bin frame 210 and the roller assembly 120 .

[0049] S300: Determine design variables according to the first main force transmission path and the second main force transmission path.

[0050] In this embodiment, the design variables include: the wall thickness V1 of the central pivot 110, the thickness V2 of the internal longitudinal ribs 211 of the warehouse frame 210, the thickness V3 of the internal transverse ribs 212 of the warehouse frame 210, and the steel plate thickness V4 of the outer skin 213 of the warehouse frame 210.

[0051] S400, obtaining an optimization target according to the load distribution target and the design variables; and analyzing the initial finite element optimization model according to the optimization target to obtain an initial discrete variable matrix of the optimization target.

[0052] In this embodiment, there are two load distribution targets, so firstly one load distribution target is selected as the optimization target, and the response analysis of the optimization target and the design variable is obtained, and then the response of the other load distribution target and the design variable is obtained according to the constraint conditions. Specifically, there is no priority order for selecting the two load distribution targets. In this embodiment, when the bottom support force N1 of the central pivot 110 is selected as the optimization target, the optimization target is: N1(V i )=(1±C)F1;where i=1,2,3,4;C is the allowable deviation coefficient, and F1 is the support force designed for the bottom of the central pivot. Wherein, the deviation coefficient is 0.05.

[0053] Obtaining an initial discrete variable matrix of the optimization objective includes:

[0054] S410, if N1<(1-C)F1, the initial discrete variable matrix V obtained is:

[0055] S420, if N1<(1-C)F1, the initial discrete variable matrix V obtained is:

[0056] Among them, t is the discrete change, which is generally taken as 1 according to the actual engineering design situation.

[0057] S500, iteratively updating the initial finite element optimization model according to the initial discrete variable matrix to obtain a response matrix of the optimization target.

[0058] S600, using the least square method to perform optimal data fitting on the initial discrete variable matrix and the response matrix to obtain a response surface function model of the optimization target.

[0059] Specifically, the response surface function model with the bottom support force N1 of the central pivot 110 as the optimization target is: Where k0 is the fitting constant; k i is the response coefficient of the i-th design variable; V i is the ith design variable.

[0060] S700, determines the optimal design variable values ​​according to the response surface function model, updates the initial geometric model according to the optimal design variable values, and verifies it using finite element analysis, thereby achieving a reasonable distribution of the turntable's bearing performance.

[0061] In this embodiment, there are two force distribution targets. Therefore, based on the target constraints between the bottom support force N1 of the central pivot 110 and the support force N2 at the connection position between the warehouse frame 210 and the roller assembly 120, as well as the stress constraints of the entire turntable system, a response surface function model of the support force N2 at the connection position between the warehouse frame 210 and the roller assembly 120 is obtained, and the initial geometric model is updated with the response surface function models of the two force distribution targets.

[0062] Specifically, the target constraint condition is: stN1+N2=F2; the stress constraint condition is: S max (x i )≤230MPa,x i ∈D; where F2 is the total bearing capacity of the turntable; x i are the nodes at each position of the finite element model, D is the entire model domain; S max is the maximum stress.

[0063] See also Figures 1 to 4As shown, the present invention applies a high-power radio station antenna. The antenna skeleton of the high-power radio station antenna is 74m high, 76m wide, 17m thick, and the total weight of the structure and auxiliary components is about 350 tons. It has a large array and heavy weight, and must overcome the impact of single or multiple severe weather such as wind, rain, snow, ice and earthquakes. In particular, it must withstand the damage to the antenna system caused by a high wind speed of nearly 55.5m / s. At this time, the antenna array is subjected to horizontal wind force of up to 147.7KN. In order to avoid the large load from causing additional complex internal stress to the structure, it is necessary to achieve three-center unity in theory, that is, the optimal wind moment center, center of gravity, and center of rotation of the antenna coincide. In addition, the transmission form and path of the force should be simplified as much as possible, with fewer transmission forms and shorter paths. In the specific design, the connection form of the rotating platform 100, the working compartment 200 and the ground foundation 300 ensures the consistency of the force direction of the roller assembly 120. The bin frame 210 can evenly transmit the force to each roller assembly 120. In this solution, the first main force transmission path and the second main force transmission path divide the force into two forms: axial force and radial force. The vertical pressure of the axial force is borne by the roller assembly 120, and the radial force is mainly overcome by the center pivot 110. At the same time, the roller assembly 120 plays an anti-overturning role.

[0064] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0065] The above-described embodiments merely represent implementation methods of the invention. The protection scope of the present invention is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A large load-bearing turntable suitable for ultra-high antenna framework, characterized in that: It comprises a rotating platform (100), a working chamber (200) and a ground foundation (300); a central pivot (110) is arranged at the center of the rotating platform (100); The bottom of the central pivot (110) is rotatably connected to the ground foundation (300), and the top is fixedly connected to the antenna frame (400), forming a first main force transmission path of the turntable; The bin frame (210) of the working bin (200) is evenly arranged around the central pivot (110) and is fixedly connected thereto; the roller assembly (120) of the rotating platform (100) is connected to the end of the bin frame (210) to form a second main force transmission path of the turntable; and the roller assembly (120) is capable of moving along a track on the ground foundation (300); Furthermore, the structural bearing performance in the first main force transmission path and the second main force transmission path is balanced.

2. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 1 is characterized in that: The main beam structure of the rotating platform (100) is fixedly connected to the central pivot (110) and the warehouse frame (210).

3. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 1 is characterized in that: The roller assembly (120) is connected to the end of the bin body frame (210) by using an adjustment base; and the bin body frame (210) adopts a multi-partition design.

4. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 1 is characterized in that: In order to achieve a balance in the structural bearing performance in the first main force transmission path and the second main force transmission path, a stiffness matching optimization design method based on key parameters is used to perform structural optimization, including the following steps: S100, establishing an initial geometric model of the central pivot and the warehouse frame according to the turntable function, and establishing an initial finite element optimization model according to the initial geometric model; S200, determining the load distribution target of the central pivot and the warehouse frame according to the mechanical analysis working condition; S300, determining design variables according to the first main force transmission path and the second main force transmission path; S400, obtaining an optimization target according to the load distribution target and the design variables; and analyzing the initial finite element optimization model according to the optimization target to obtain an initial discrete variable matrix of the optimization target; S500, iteratively updating the initial finite element optimization model according to the initial discrete variable matrix to obtain a response matrix of the optimization target; S600, using the least square method to perform optimal data fitting on the initial discrete variable matrix and the response matrix to obtain a response surface function model of the optimization target; S700, determines the optimal design variable values ​​according to the response surface function model, updates the initial geometric model according to the optimal design variable values, and verifies it using finite element analysis, thereby achieving a reasonable distribution of the turntable's bearing performance.

5. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 4 is characterized in that: The load distribution target includes: the bottom support force N1 of the central pivot (110), and the support force N2 of the connection position between the warehouse frame (210) and the roller assembly (120); the design variables include: the wall thickness V1 of the central pivot (110), the thickness V2 of the internal longitudinal reinforcement (211) of the warehouse frame (210), the thickness V3 of the internal transverse reinforcement (212) of the warehouse frame (210), and the thickness V4 of the steel plate of the outer skin (213) of the warehouse frame (210).

6. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 5 is characterized in that: When the bottom support force N1 of the central pivot (110) is selected as the optimization target, the optimization target is: N1(V i )=(1±C)F1; wherein, i=1, 2, 3, 4; C is the allowable deviation coefficient; F1 is the support force designed for the bottom of the central pivot.

7. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 6 is characterized in that: Obtaining an initial discrete variable matrix of the optimization objective includes: S410, if N1<(1-C)F1, the initial discrete variable matrix V obtained is: S420, if N1<(1-C)F1, the initial discrete variable matrix V obtained is: Among them, t is the discrete change.

8. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 7 is characterized in that: The response surface function model with the bottom support force N1 of the central pivot (110) as the optimization target is: Where k0 is the fitting constant; k i is the response coefficient of the i-th design variable; V i is the ith design variable.

9. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 8, characterized in that: Based on the target constraints between the bottom support force N1 of the central pivot (110) and the support force N2 at the connection position between the warehouse frame (210) and the roller assembly (120), as well as the stress constraints of the entire turntable system, a response surface function model of the support force N2 at the connection position between the warehouse frame (210) and the roller assembly (120) is obtained; and the initial geometric model is updated using the response surface function model of the two force distribution targets.

10. The large load-bearing turntable suitable for an ultra-high antenna frame according to claim 9, characterized in that: The target constraint condition is: stN1+N2=F2; the stress constraint condition is: S max (x i )≤230MPa,x i ∈D; where F2 is the total bearing capacity of the turntable; x i are the nodes at each position of the finite element model, D is the entire model domain; S max is the maximum stress.

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