Large-span saddle-shaped tensile membrane antenna housing bearing test method and device
The air bag and inflatable boost loading components simulate the air pressure, apply uniform pressure load, and combine the sensor and the total station to record data, solving the problems of uneven load distribution of saddle tension membrane radomes and high testing costs, achieving low-cost and convenient mechanical performance testing.
Patent Information
- Application Number
- CN202510190003.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-05-23
AI Technical Summary
When performing static tests of saddle-shaped tensioned membrane radomes, conventional loading methods lead to uneven load distribution, concentrated film stress, and high cost of large-span wind tunnel testing, making it difficult to effectively test its load-bearing capacity.
The airbag and inflatable boost loading assembly are used to simulate the stress deformation characteristics under different wind pressures through the boost of the airbag, and apply uniform pressure loads, and data recording and attitude scanning are carried out in combination with the strain sensor and the total station.
The mechanical performance test of a large-span saddle-shaped tensioning membrane radome is realized at low cost, avoiding stress concentration and unevenness during load loading, and improving the reliability and convenience of the test.
Smart Images
Figure CN120028127A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of radar antenna covers, and in particular to a load-bearing test method and device for a large-span saddle-shaped tensile membrane antenna cover. Background Art
[0002] The radome is the electromagnetic window of the antenna. The thickness of the radome is usually very thin, and its environmental adaptability needs to be evaluated through a wind resistance static test. Conventional radome wind resistance static test loading methods include water pressure loading, sandbag loading, multi-stage cylinder loading, and wind tunnel test loading.
[0003] The saddle-shaped tensile membrane radome is a new type of prestressed membrane structure radome with a saddle-shaped negative Gaussian surface shape, and the main cover is a layer of flexible film. The radome is high at both ends and low in the middle. When conducting static tests, the use of water pressure loading will cause the pressure in the middle area to be higher than the ends, and the large deformation of the radome will aggravate the flow of water to the lower part, resulting in uneven load distribution; the use of sandbags and multi-stage cylinder loading methods will cause local stress concentration on the membrane surface for flexible films, and stress collection distortion. Conventional static test methods for radomes are no longer applicable, and the cost of large-span wind tunnel static tests is too high, which makes it difficult to test the bearing capacity of saddle-shaped tensile membrane radomes. Therefore, a large-span saddle-shaped tensile membrane radome bearing test method and device are proposed to effectively test the bearing capacity of saddle-shaped tensile membrane radomes at a lower test cost. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides a method and device for testing the load-bearing performance of a large-span saddle-shaped tensile membrane antenna cover, which solves the problems raised in the above-mentioned background technology.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A large-span saddle-shaped tensile membrane antenna cover load-bearing test method, specifically comprising the following steps: Step 1: Set up a saddle-shaped tensile membrane radome to be tested on the experimental tooling, paste a strain sensor on the top of the saddle-shaped tensile membrane radome to be tested, paste a target point on the bottom of the saddle-shaped tensile membrane radome to be tested, and arrange a total station and a displacement sensor in the experimental tooling. After zeroing the strain sensor and the displacement sensor, the total station scans and records the initial posture of the saddle-shaped tensile membrane radome to be tested; Step 2: Lay an airbag on top of the saddle-shaped tensile membrane radome to be tested, use a reaction rope net to cover the airbag, and fix the reaction rope net to the experimental tooling, obtain the total weight m of the reaction rope net and the airbag, and the total area S of the upper surface of the saddle-shaped tensile membrane radome to be tested, which is recorded as the force applied to the surface of the saddle-shaped tensile membrane radome to be tested. The pressure load; Step 3: Use the inflation boost loading component to inflate the airbag. Every two minutes, turn off the inflation boost loading component to obtain the pressure difference value P1 at the inflation end of the airbag, and at the same time obtain the pressure difference value P2 between the inside of the airbag and the atmosphere on the side of the airbag away from the inflation end. When the absolute difference between P1 and P2 is less than or equal to 10Pa, take the average of P1 and P2 as the pressure difference P between the inside of the airbag and the atmosphere. At this time, the pressure load applied to the surface of the saddle-shaped tensile membrane antenna cover to be tested is ; Step 4: Under pressure load When the required loading pressure value is reached, the current data of the strain sensor and the displacement sensor are recorded, and the current posture of the saddle-shaped tensile membrane antenna cover to be tested is scanned and recorded by the total station.
[0006] The present invention also discloses a large-span saddle-shaped tensile membrane antenna cover load-bearing test device, including an experimental tool and an inflatable pressurized loading component, wherein a saddle-shaped tensile membrane antenna cover to be tested is mounted on the experimental tool, and a strain sensor is pasted on the upper surface of the saddle-shaped tensile membrane antenna cover to be tested. A reaction rope net is also arranged on the experimental tool, and the reaction rope net is sleeved on the outer periphery of the saddle-shaped tensile membrane antenna cover to be tested, and an airbag is also arranged between the reaction rope net and the upper surface of the saddle-shaped tensile membrane antenna cover to be tested, and the inflatable pressurized loading component is used in conjunction with the airbag.
[0007] The present invention is further configured as follows: the experimental tooling comprises a tooling frame, both sides of the top of the tooling frame are fixedly mounted with structural arches, and the top of the experimental tooling is fixedly mounted with a total station and a plurality of displacement sensors; The saddle-shaped tensile membrane radome to be tested is fixedly installed on the outer circumference of two structural arches.
[0008] The present invention is further configured as follows: the reaction rope net comprises a nylon rope net, a plurality of eyebolts and a plurality of reinforcing ropes, and the plurality of eyebolts are respectively fixedly mounted on both ends of the nylon rope net; The nylon rope net is set on the outer periphery of the airbag and the saddle-shaped tensioned membrane antenna cover to be tested, and a plurality of eye bolts are threadedly installed on both ends of the tooling frame, a plurality of reinforcement ropes are evenly arranged on the top of the nylon rope net, and the two ends of the reinforcement ropes are fixedly connected to the front and rear sides of the bottom of the tooling frame respectively.
[0009] The present invention is further configured as follows: the inflation pressurization loading assembly includes a blower and a first differential pressure gauge, the output end of the blower is connected to an inflation pipe, the inflation pipe is also provided with a control valve and a second differential pressure gauge, and the second differential pressure gauge is arranged on the side of the control valve away from the blower.
[0010] The present invention is further configured as follows: the airbag comprises an airbag body and two adapter members, and the two adapter members respectively penetrate through and are fixedly mounted at two ends of the airbag body.
[0011] The present invention is further configured as follows: one end of the inflation tube is connected and fixed to an adapter member, and the first differential pressure gauge is connected and fixed to another adapter member.
[0012] The present invention is further configured as follows: the airbag body is formed by hot-melt welding of one of a light PVC film, an ETFE film and a PE film.
[0013] The present invention provides a method and device for testing the load-bearing performance of a large-span saddle-shaped tensile membrane antenna cover. It has the following beneficial effects: The present invention cooperates with an airbag and an inflatable pressurized loading component to simulate the stress and deformation characteristics of a large-span saddle-shaped tensile membrane radome to be tested under different wind pressures through the pressurization of the airbag, and can generate a uniform pressure load on the surface of the saddle-shaped tensile membrane radome to be tested, effectively avoiding the film stress concentration and uneven loading of special-shaped curved surfaces caused by load loading. The operation is convenient, and the mechanical properties of the large-span saddle-shaped tensile membrane radome to be tested can be effectively tested, and low-cost and convenient support is provided for the reliability test of the large-span saddle-shaped tensile membrane radome to be tested. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is an exploded schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the external structure of the present invention after the nylon rope net is removed; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at center A; Figure 5 Graph showing the change of airbag pressure difference P over time in an embodiment of the present invention.
[0015] In the figure: 1. Experimental tooling; 101. Tooling frame; 102. Structural arch; 103. Total station; 104. Displacement sensor; 2. Inflatable pressurizing loading assembly; 201. Blower; 202. First differential pressure gauge; 203. Inflatable pipe; 204. Control valve; 205. Second differential pressure gauge; 3. Saddle-shaped tensile membrane radome to be tested; 4. Strain sensor; 5. Reaction rope net; 501. Nylon rope net; 502. Eyebolt; 503. Reinforcement rope; 6. Airbag; 601. Airbag body; 602. Adapter fitting. Detailed implementation mode
[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.
[0017] Please refer to Figure 1-5 , the embodiments of the present invention provide the following technical solutions: A large-span saddle-shaped tension membrane radome bearing test device includes an experimental tooling 1 and an air inflation and pressurization loading component 2. A saddle-shaped tension membrane radome 3 to be tested is installed on the experimental tooling 1. Specifically, the experimental tooling 1 includes a tooling frame 101. Structural arches 102 are fixedly installed on both sides of the top of the tooling frame 101. The saddle-shaped tension membrane radome 3 to be tested is fixedly installed on the outer periphery of the two structural arches 102. A total station 103 and several displacement sensors 104 are fixedly installed on the top of the experimental tooling 1.
[0018] Among them, the saddle-shaped tension membrane radome 3 to be tested is in the form of a prestressed space membrane structure, made of a flexible medium thin film, with a thickness of about 1 mm. The structure has no bending stiffness and can only rely on its own large deformation to resist external loads.
[0019] As a preferred solution, in order to apply a uniform pressure load to the saddle-shaped tension membrane radome 3 to be tested, strain sensors 4 are pasted on the upper surface of the saddle-shaped tension membrane radome 3 to be tested. A reaction rope net 5 is also arranged on the experimental tooling 1. The reaction rope net 5 is sleeved on the outer periphery of the saddle-shaped tension membrane radome 3 to be tested. An airbag 6 is also arranged between the reaction rope net 5 and the upper surface of the saddle-shaped tension membrane radome 3 to be tested. The reaction rope net 5 is used to limit the airbag 6. Specifically, the reaction rope net 5 includes a nylon rope net 501, several eyebolt 502 and several reinforcing ropes 503. Several eyebolt 502 are respectively fixedly installed at both ends of the nylon rope net 501. The nylon rope net 501 is sleeved on the outer periphery of the airbag 6 and the saddle-shaped tension membrane radome 3 to be tested. Several eyebolt 502 are respectively threadedly installed at both ends of the tooling frame 101. Several reinforcing ropes 503 are evenly arranged at the top of the nylon rope net 501. The two ends of the reinforcing ropes 503 are respectively fixedly connected to the front and rear sides of the bottom of the tooling frame 101.
[0020] As a detailed description, the airbag 6 includes an airbag body 601 and two adapter fittings 602. The airbag body 601 is formed by hot melt welding of one of a lightweight PVC film, an ETFE film and a PE film. The adapter fitting 602 is an internal thread flange. The two adapter fittings 602 respectively penetrate and are fixedly installed at both ends of the airbag body 601.
[0021] As a preferred solution, in order to apply a pressure load to the saddle-shaped tensile membrane antenna cover 3 to be tested, the inflatable boost loading assembly 2 is used in conjunction with the airbag 6. The inflatable boost loading assembly 2 includes a blower 201 and a first differential pressure gauge 202. The output end of the blower 201 is connected to an inflation tube 203. One end of the inflation tube 203 is connected and fixed to a transfer interface 602. The inflation tube 203 is also provided with a control valve 204 and a second differential pressure gauge 205. The second differential pressure gauge 205 is arranged on the side of the control valve 204 away from the blower 201. The first differential pressure gauge 202 is connected and fixed to another transfer interface 602.
[0022] The method for using the above-mentioned span saddle-shaped tensile membrane antenna cover load-bearing test device specifically comprises the following steps: Step 1: Set up the saddle-shaped tensile membrane radome 3 to be tested on the experimental tooling 1, fix the saddle-shaped tensile membrane radome 3 to be tested on the structural arch 102, paste the strain sensor 4 on the top of the saddle-shaped tensile membrane radome 3 to be tested, and then paste the target point on the bottom of the saddle-shaped tensile membrane radome 3 to be tested, and arrange the total station 103 and the displacement sensor 104 in the tooling frame 101. After zeroing the strain sensor 4 and the displacement sensor 104, the total station 103 scans and records the initial posture of the saddle-shaped tensile membrane radome 3 to be tested; Step 2: Lay the airbag 6 on the saddle-shaped tensile membrane antenna cover 3 to be tested, put the nylon rope net 501 on the airbag 6, and fix the nylon rope net 501 and the two ends of the tooling frame 101 through the eye bolts 502, and then place the reinforcement rope 503 on the nylon rope net 501, so that the two ends of the reinforcement rope 503 are respectively fixed to the two sides of the bottom of the tooling frame 101, and complete the test assembly; At this time, the total weight m of the nylon rope net 501, the reinforcement rope 503 and the airbag 6, and the total area S of the upper surface of the saddle-shaped tensile membrane antenna cover 3 to be tested are obtained, and recorded as the weight m applied to the surface of the saddle-shaped tensile membrane antenna cover 3 to be tested. The pressure load; Step 3: Start the blower 201, open the control valve 204, accelerate the gas flow from the inflation tube 203 to the airbag 6, inflate the airbag 6, close the control valve 204 every two minutes, obtain the pressure difference value P1 between the airbag and the atmosphere displayed by the second differential pressure gauge 205, and simultaneously obtain the pressure difference value P2 between the inside of the airbag 6 and the atmosphere displayed by the first differential pressure gauge 202. When the absolute difference between P1 and P2 is less than or equal to 10Pa, take the average of P1 and P2 as the pressure difference P between the inside of the airbag 6 and the atmosphere. At this time, the pressure load applied to the surface of the saddle-shaped tensile membrane antenna cover 3 to be tested is ; Step 4: Under pressure load When the required loading pressure value is reached, the current data of the strain sensor 4 and the displacement sensor 104 are recorded, and the current posture of the saddle-shaped tensile membrane antenna cover 3 to be tested is scanned and recorded by the total station 103 .
[0023] The relationship between the P generated in this embodiment and the time is shown in the attached figure. Figure 5 As shown, the test method provided by the present invention can generate a balanced pressure of several thousand Pa, which can cover the extreme wind load in the environmental conditions of the saddle-shaped tensile membrane antenna cover 3 to be tested, wherein the limit value of the load generated by the test method provided by the present invention depends on the pressure head size of the blower 201 and the tolerable internal pressure value of the airbag 6, wherein the tolerable internal pressure value of the airbag 6 is closely related to the material, thickness and hot-melt welding quality of the airbag body 601.
[0024] It should be noted that the pressure difference count value increases slowly in the early stage of the test. When the airbag 6 is inflated, the nylon rope net 501 and the reinforcement rope 503 are tightened, and the growth of P2 is accelerated, the control valve 204 is adjusted to slow down the inflation loading rate.
[0025] During the test, when the test termination requirements are met, the blower 201 and the control valve 204 need to be closed. Specifically, when the airbag 6 is damaged and cannot maintain pressure, or when the nylon rope net 501 and / or the reinforcement rope 503 are abnormally broken, the blower 201 and the control valve 204 should be closed in time and the test equipment should be replaced.
[0026] To further explain, when the absolute difference between P1 and P2 cannot reach less than or equal to 10 Pa, the blower 201 and the control valve 204 should be turned off, and the airbag 6 should be checked for wrinkles.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A load-bearing test method for a large-span saddle-shaped tensile membrane radome, characterized in that: The specific steps include: Step 1: setting up a saddle-shaped tensile membrane radome (3) to be tested on an experimental tooling (1), attaching a strain sensor (4) to the top of the saddle-shaped tensile membrane radome (3) to be tested, attaching a target point to the bottom of the saddle-shaped tensile membrane radome (3) to be tested, and arranging a total station (103) and a displacement sensor (104) in the experimental tooling (1). After zeroing the strain sensor (4) and the displacement sensor (104), the total station (103) scans and records the initial posture of the saddle-shaped tensile membrane radome (3) to be tested. Step 2: Lay an airbag (6) on the top of the saddle-shaped tensile membrane radome (3) to be tested, use a reaction rope net (5) to cover the top of the airbag (6), and fix the reaction rope net (5) to the experimental tooling (1), obtain the total weight m of the reaction rope net (5) and the airbag (6), and the total area S of the upper surface of the saddle-shaped tensile membrane radome (3) to be tested, and record it as the force applied to the surface of the saddle-shaped tensile membrane radome (3) to be tested. The pressure load; Step 3: Use the inflation boost loading component (2) to inflate the airbag (6). At intervals of two minutes, close the inflation boost loading component (2) to obtain the pressure difference value P1 at the inflation end of the airbag (6). At the same time, obtain the pressure difference value P2 between the inside of the airbag (6) and the atmosphere on the side of the airbag (6) away from the inflation end. When the absolute difference between P1 and P2 is less than or equal to 10Pa, the average of P1 and P2 is taken as the pressure difference P between the inside of the airbag (6) and the atmosphere. At this time, the pressure load applied to the surface of the saddle-shaped tensile membrane antenna cover (3) to be tested is ; Step 4: Under pressure load When the required loading pressure value is reached, current data of the strain sensor (4) and the displacement sensor (104) are recorded, and the current posture of the saddle-shaped tensile membrane antenna cover (3) to be tested is scanned and recorded by a total station (103).
2. A large-span saddle-shaped tensile membrane antenna cover load-bearing test device, characterized in that: The invention comprises an experimental tool (1) and an inflatable pressurized loading assembly (2), wherein a saddle-shaped tensile membrane antenna cover (3) to be tested is mounted on the experimental tool (1), a strain sensor (4) is attached to the upper surface of the saddle-shaped tensile membrane antenna cover (3) to be tested, and a reaction rope net (5) is also arranged on the experimental tool (1), wherein the reaction rope net (5) is sleeved on the outer periphery of the saddle-shaped tensile membrane antenna cover (3) to be tested, and an air bag (6) is also arranged between the reaction rope net (5) and the upper surface of the saddle-shaped tensile membrane antenna cover (3) to be tested, and the inflatable pressurized loading assembly (2) is used in conjunction with the air bag (6).
3. The large-span saddle-shaped tensile membrane antenna cover load-bearing test device according to claim 2, characterized in that: The experimental tool (1) comprises a tool frame (101), structural arches (102) are fixedly mounted on both sides of the top of the tool frame (101), and a total station (103) and a plurality of displacement sensors (104) are fixedly mounted on the top of the experimental tool (1); The saddle-shaped tensile membrane radome (3) to be tested is fixedly mounted on the outer periphery of two structural arches (102).
4. The large-span saddle-shaped tensile membrane radome load-bearing test device according to claim 3 is characterized in that: The reaction rope net (5) comprises a nylon rope net (501), a plurality of eyebolts (502) and a plurality of reinforcing ropes (503), wherein the plurality of eyebolts (502) are respectively fixedly mounted on both ends of the nylon rope net (501); The nylon rope net (501) is sleeved on the outer circumference of the airbag (6) and the saddle-shaped tensile membrane antenna cover (3) to be tested, and a plurality of eye bolts (502) are respectively threadedly installed on both ends of the tooling frame (101), and a plurality of reinforcement ropes (503) are evenly spaced and arranged on the top of the nylon rope net (501), and the two ends of the reinforcement ropes (503) are respectively fixedly connected to the front and rear sides of the bottom of the tooling frame (101).
5. The large-span saddle-shaped tensile membrane radome load-bearing test device according to claim 2, characterized in that: The inflation and pressurization loading assembly (2) comprises a blower (201) and a first differential pressure gauge (202); the output end of the blower (201) is connected to an inflation pipe (203); the inflation pipe (203) is further provided with a control valve (204) and a second differential pressure gauge (205); the second differential pressure gauge (205) is provided on a side of the control valve (204) away from the blower (201).
6. The large-span saddle-shaped tensile membrane radome load-bearing test device according to claim 5, characterized in that: The airbag (6) comprises an airbag body (601) and two adapter members (602), wherein the two adapter members (602) respectively penetrate through and are fixedly mounted at two ends of the airbag body (601).
7. The large-span saddle-shaped tensile membrane radome load-bearing test device according to claim 6, characterized in that: One end of the inflation tube (203) is connected and fixed to an adapter member (602), and the first differential pressure gauge (202) is connected and fixed to another adapter member (602).
8. The large-span saddle-shaped tensile membrane radome load-bearing test device according to claim 6, characterized in that: The airbag body (601) is formed by hot-melt welding of one of a lightweight PVC film, an ETFE film and a PE film.