CN113155387B - Method for preparing universal box type skin antenna vibration test clamp - Google Patents
Method for preparing universal box type skin antenna vibration test clamp Download PDFInfo
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- CN113155387B CN113155387B CN202110338033.7A CN202110338033A CN113155387B CN 113155387 B CN113155387 B CN 113155387B CN 202110338033 A CN202110338033 A CN 202110338033A CN 113155387 B CN113155387 B CN 113155387B
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- 238000013461 design Methods 0.000 claims abstract description 41
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention discloses a method for preparing a vibration test fixture of a universal box-type skin antenna, which aims at the problems of strong specialization and high design difficulty caused by the characteristics of the uncertain shape of the outer edge of the skin antenna and conformal shape with an airplane, and provides a universal design method with good structural manufacturability and high universalization and standardization degree. The invention is realized by the following steps: step 1: the Z-direction vibration is taken as the main material, the clamp is decomposed into a plate, a beam and a reinforcing rib, and the initial shape of the bottom plate model of the lower box body of the clamp is built: step 2: positioning the positions and the sizes of the side plates of the lower box body and the reinforcing ribs according to the size of the bottom plate of the lower box body to obtain the initial shape of the side plate model of the lower box body; step 3: positioning the positions and the sizes of the upper box floor, the side plates and the reinforcing ribs based on the size of the lower box, and cutting the side plates by adopting the lower curved surface of the skin to obtain the initial appearance of the upper box model; step 4: and refining the appearance of the clamp according to engineering application requirements to obtain the final appearance of the clamp.
Description
Technical Field
The invention relates to a method for preparing a vibration test clamp for a universal box-type skin antenna, which belongs to the field of vibration clamp structure design.
Background
Along with the development of technology, particularly the development of industries such as aerospace, mechanical manufacturing and the like, the vibration problem becomes a problem that can not be bypassed. Vibration test, the vibration clamp is not separated. As devices are more and more powerful, and more elaborate, the environment is more and more complex, and it is very difficult to completely solve the vibration problem in theory. At present, not only is a complex vibration environment simulated through a vibration test, but also an increasingly important effect of eliminating early product technology and component defects through a screening vibration test is required. The requirement of the structural vibration reliability of the airborne antenna needs to be verified in the development stage. The vibration test fixture is used for connecting the test piece and the vibration table and plays a role in simulating the geometric boundary condition and the dynamic characteristic constraint condition of the test piece. The vibration table can transmit the motion of the vibration table to the test piece as undistorted as possible, so that the motion of the test piece in a specified direction is consistent with the output of the vibration table. Therefore, the jig plays a significant role in the vibration test. The vibration clamp is an important link in the vibration test, and relates to success and failure of the test, the credibility of the test result and the like. The design of the jig is a key step in the vibration test. The clamp is a connector for connecting a test piece and the vibrating table, and the first-order natural frequency of the vibrating clamp is one of important parameters for measuring the design reliability of the clamp and is also one of key factors for the reliability of a vibration test. The versatility of the fixture is a representation of the experience of the fixture designer, reflecting the design level of the designer. The evaluation jig design mainly includes two aspects: the convenience and reliability of the fixed product and the transmission characteristic of vibration. The transmission characteristics of the vibration clamp are mainly determined by the rigidity and the damping of the vibration clamp. The static design of the clamp firstly meets the requirement of fixing the product on the table top, and meanwhile, the thrust range of the vibrating table is not exceeded after the product is installed. The vibration clamp is used for connecting a product with the vibration table to perform a vibration test, and is different from a static test. The vibration fixture is more focused on the transmission of vibration, and the fact that the vibration of the vibration table cannot be effectively transmitted to a product is a key to the suitability of the vibration fixture. A good fixture should transmit the motion of the vibrating test table to the test piece without distortion, i.e. a transmission coefficient of the vibration fixture over the entire test frequency range is required, which is difficult to achieve in practice. Resonance occurs when the vibration frequency of the vibration table is based on the amplitude frequency characteristic of the forced vibration. Therefore, the lowest natural frequency of the vibration clamp is kept away from the vibration test frequency band as far as possible, and the specified clamp designed according to the radar complete machine reliability identification test clamp structure should work within the range of 0-500 Hz. In the design, frequency points F1, F2, F3 and F4 are kept away as far as possible, and the natural frequency of the vibration clamp is improved as far as possible, so that the natural frequency is difficult to calculate due to the fact that the size of the vibration clamp is large and the structure is complex. Since the method Deng Kelai is used for calculating the natural frequency of the vibration clamp, a certain error exists, and then a weaker component is selected in the calculation process and a relatively stronger component is ignored for calculating the natural frequency, although the calculation is greatly simplified, a certain error exists, and in addition, the setting positions of the control point and the response point in the test have direct influence on the test result, so that the difference between the natural frequency of the clamp and the calculated value is generally allowed. The clamp is a force transmission component for transmitting the excitation force of the vibrating table to tested equipment without distortion, in most previous papers related to clamp design and modal analysis, the connection between the clamp and a base is simplified to be rigid connection, and the first few orders of modes of the clamp are given through finite element analysis, but in actual use, the actual measured resonance frequency of the clamp has larger deviation from the theoretical value of a main mode. In the jig design and manufacturing process, the dynamics of the jig has been considered as an important index for evaluating the jig, but it is difficult for a jig having a complicated structure to accurately calculate the dynamics according to the drawing. The traditional method is that after the clamp is manufactured, the dynamic characteristics of the clamp are tested through a sine sweep test, a broadband white spectrum random vibration test, a mark test analysis test and the like. Therefore, the manufactured clamp is inevitably modified, and measures such as increasing the number of connecting screws, increasing the pretightening force of the bolts, adding reinforcing ribs, improving local rigidity and the like are adopted. Many complicated jigs need to be modified many times to satisfy the operation requirement, cause waste in manpower, material resources and time, prolong the development cycle of product.
The airborne skin antenna is an antenna which is conformal with an airplane, has strong specificity for a clamp with an indefinite shape of the outer edge of the skin and is difficult to design. Because the antenna is conformal with the skin, the skin antenna has a large number of curved surfaces, large span, excessive softness and other problems. During flight, the outer skin is subjected to various types of vibration loads, so that the design of the vibration test fixture of the antenna with the skin on the vehicle is a system work, and a plurality of problems need to be comprehensively considered. Vibration testing of an on-board skin antenna is the most dominant means of evaluating its mechanical environment adaptation capability. In order to reduce the excitation frequency of vibration and achieve the purpose of suppressing resonance, the vibration test fixture of the airborne skin antenna is used as a connecting piece of a product and a vibrating table, plays a role in simulating the real installation environment of the product and transmitting vibration energy, and whether the design of the vibration test fixture of the airborne skin antenna is successful or not directly affects the result of a vibration test. In specific experimental practices, the requirements for the clamps are varied. In addition, the first order resonant frequency of the clamp is required to be larger than that of the product, and in practical situations, particularly in a larger and thinner clamp, the resonant frequency is generally lower, so that the requirement is difficult to meet. A good fixture not only can ensure the smooth performance of the test, but also can make the test have twice as much effort and improve the efficiency. In addition, the design of the clamp has a great influence on the test cost. The designer of the jig plays an important role in the test. The success or failure of the vibration test and the credibility of the test result are relevant to the design, manufacture and installation use level of the test fixture.
The traditional box-type skin antenna vibration test fixture is generally formed by adopting a glue sand die, the molded surface of the traditional box-type skin antenna vibration test fixture is formed by scraping a scraping plate on a scraping frame in a rotating way, and the manufacturing is performed by adopting a scraping plate rotating and scraping forming and then polishing method. However, this method has a great limitation for the vibration test jig for the box-type skin antenna. The problems are mainly reflected in the following two aspects: non-uniformity of the margin. The machining allowance is larger, and the numerical control machining time is more. The analysis is mainly because the scraping plate manufactured by the plywood generates buckling deformation after water meeting, so that the scraped molded surface is thick. The existing antenna vibration test fixture design method mainly relies on an empirical design method for iterative design, namely, the fixture is designed according to engineering experience, and then the fixture performance is checked through vibration test or finite element simulation. In prior art publications, electronics and mechanical engineering 2008,24 (5): 51-54.). Yuan Xinjiang and the like design split antenna pedestal clamp PSD spectrum analysis and experimental study, and perform finite element mode and PSD spectrum analysis on the clamp. 2003,23 (3): 210-232. Design of vibration test fixture for certain airborne radar antenna, liu Jicheng, zhou Chuanrong. Liu Jicheng, etc. according to the vibration test conditions of certain airborne radar and the design specification of the test fixture for related vibration environment, structural dynamic characteristic design is performed on the vibration test fixture for the antenna middle block. The above-mentioned empirical design method is the most common design method in engineering, but has problems of poor versatility, long design period, and the like. The skin antenna is conformal with the skin antenna, the shape difference of the skin is large, each skin antenna needs to be specially designed, and no general design method exists at present. Therefore, a general design method for the cassette skin antenna jig is urgently required to shorten the design cycle.
Disclosure of Invention
The invention aims at solving the problems of strong specialization and high design difficulty caused by the characteristics of the uncertain shape of the outer edge of the skin of a skin antenna and the conformal shape of an airplane, and provides a box type skin antenna vibration experiment clamp universal design method with short design period, good rigidity, good structure manufacturability, lower clamp manufacturing cost and high clamp element universalization and standardization degree based on the structural characteristics of the skin antenna.
In order to achieve the above object, the present invention solves the above technical problems by adopting the following technical solutions: the method for preparing the vibration test clamp of the universal box-type skin antenna is characterized by comprising the following steps of:
step 1: according to the actual use condition of the clamp, the action, shape, weight, rigidity, structural characteristics and material hardness of the part are analyzed, the clamp is decomposed into a plurality of components including a plate, a beam and a reinforcing rib mainly in the Z-direction vibration, the structural design of the clamp is carried out according to the shape of the antenna skin and the test requirement, and the original three-dimensional solid model of the clamp is built: the central axis is installed through a fixture, the circle center of an antenna skin 2 installation hole of a box-shaped skin is projected onto a vibrating table, projection points of the skin installation holes are connected into a fold line 6, an outer edge line 11 of a bottom plate and an inner edge line 12 of the bottom plate are positioned through intersection points of the fold line 6 and the bottom plate hole, the thickness of the bottom plate is assigned to obtain the solid shape of the bottom plate, a countersunk hole is formed in the bottom plate, a workpiece contour line is drawn to serve as a designed model, and a figure plane is arranged to obtain the initial shape of the bottom plate model of the lower antenna box body 1;
step 2: according to the projection center line positions of the side plate positioned by the center lines of the outer edge line 13 and the inner edge 14 of the bottom plate, a horizontal line 15 is drawn by taking the turning point of the inner edge of the bottom plate as a reference, a vertical line 16 by taking the turning point of the inner edge of the bottom plate as a reference is positioned to obtain a vertical reinforcing rib center line 18, two reinforcing ribs are added on two sides of the vertical reinforcing rib, the thickness is assigned to the side plate and the reinforcing ribs of the side plate, and the initial shape of the side plate model of the lower box body can be obtained by assigning the height to the side plate;
step 3: taking a central line 19 of an antenna box body 1 envelope and skin mounting hole connecting line as an inner edge of a side plate of an upper box body 3 and an inner edge line 12 of a bottom plate of the upper box body, taking an outer edge line 13 of a bottom plate of a lower box body 4 as an outer edge line of a bottom plate of the upper box body, adopting the outer edge line 13 and the central line 19 of the bottom plate of the box body, cutting a transverse reinforcing rib central line 17 of the side plate of the lower box body 4 to obtain an upper box body side plate reinforcing rib central line 20, assigning thickness to the bottom plate, the side plate and the side plate reinforcing rib, assigning height to the side plate, and adopting a skin lower curved surface cutting side plate to obtain an initial shape of the model of the upper box body 3;
step 4: and refining the appearance of the clamp according to engineering application requirements to obtain the final appearance of the clamp, and verifying the reliability of the clamp through finite element simulation.
The invention has the following beneficial effects.
According to the actual use condition of the clamp, the action, shape, weight, rigidity, structural characteristics and material hardness of parts are analyzed, the overall layout of the clamp, the structural form of the clamp body and the position of a positioning element on the clamp body are determined, the circle center of an antenna skin 2 mounting hole of a box-type skin is projected onto a vibrating table, projection points of the skin mounting holes are connected into a fold line 6, a bottom plate outer edge line 11 and a bottom plate inner edge line 12 are positioned through the intersection point of the fold line 6 and a bottom plate hole, the bottom plate thickness is assigned to obtain a bottom plate solid shape, a countersunk hole is formed in the bottom plate, a workpiece contour line is drawn to be used as a designed model, and a figure plane is arranged to obtain the bottom plate initial shape of a lower antenna box body 1; the structure is simple and compact, the size is stable, the residual stress is small, and the structure manufacturability is good.
The invention takes a central line 19 of an antenna box body 1 enveloping and skin mounting hole connecting line as an inner edge of a side plate of an upper box body 3 and an inner edge line 12 of a bottom plate of the upper box body, takes an outer edge line 13 of a bottom plate of a lower box body 4 as an outer edge line of a bottom plate of the upper box body, adopts the outer edge line 13 and the central line 19 of the bottom plate of the box body, cuts a transverse reinforcing rib central line 17 of a side plate of the lower box body 4 to obtain a reinforcing rib central line 20 of the side plate of the upper box body, assigns thickness to the side plate, assigns height to the side plate, and adopts a lower curved surface of the skin to cut the side plate to obtain the initial appearance of the upper box body. The fixture can be ensured to have a certain service life and lower fixture manufacturing cost.
The invention takes a central line 19 of an antenna box body 1 enveloping and skin mounting hole connecting line as an inner edge of a side plate of an upper box body 3 and an inner edge line 12 of a bottom plate of the upper box body, takes an outer edge line 13 of a bottom plate of a lower box body 4 as an outer edge line of a bottom plate of the upper box body, adopts the outer edge line 13 and the central line 19 of the bottom plate of the box body, cuts a transverse reinforcing rib central line 17 of a side plate of the lower box body 4 to obtain a reinforcing rib central line 20 of the side plate of the upper box body, assigns thickness to the side plate, assigns height to the side plate, and adopts a lower curved surface of the skin to cut the side plate to obtain the initial appearance of the upper box body. The clamp element is high in universality and standardization, and the clamp is convenient to manufacture, use and maintain.
According to the invention, the appearance of the clamp is thinned according to engineering application requirements, the final appearance of the clamp is obtained, and the reliability of the clamp is verified through finite element simulation. The vibration test fixture has the advantages of short design period, good rigidity, good manufacturing precision and good structural manufacturability, can avoid blindness of the vibration test fixture design, reduce waste of manpower, material resources and time caused by repeated maintenance due to the fact that the dynamic characteristics of the fixture do not meet test requirements, improve working efficiency and test quality, shorten the development period of products, and enable the vibration test fixture design to be scientific and reasonable. The vibration test shows that the dynamic characteristic of the clamp meets the design requirement of the clamp for the vibration environment test. When the antenna is used for the environmental vibration test, the control error of the acceleration spectral density value is obviously less than +/-3 dB, and the requirements of the related vibration environmental test specifications are completely met.
Drawings
Fig. 1 is a cross-sectional view of a typical structure of the cassette skin antenna jig of the present invention.
Fig. 2 is a schematic view of the bottom plate of the lower case of fig. 1.
Fig. 3 is a schematic view of a side plate of the lower case of fig. 1.
Fig. 4 is a schematic view of the design of the case in fig. 1.
The reference numerals in the figures explain: 1 antenna box body, 2 antenna skin, 3 upper box body, 4 lower box body, 5 shaking table projection, 6 broken lines, 7 are horizontal lines passing through shaking table hole circle centers, 8 are vertical lines passing through shaking table hole circle centers, 9 are intersection points of broken lines and horizontal lines, 10 are intersection points of broken lines and vertical lines, 11 bottom plate outer edge points, 12 bottom plate inner edge points, 13 bottom plate outer edge lines, 14 bottom plate inner edge lines, 15 are central lines of bottom plate outer edge and inner edge lines, 16 horizontal lines, 17 vertical lines, 18 transverse reinforcing rib central lines, 19 are vertical reinforcing rib central lines, 20 are projection of an antenna box body envelope on a shaking table, 21 are central lines of antenna box body envelope and skin mounting hole connecting lines, 22 are bottom plate inner edge lines of an upper box body, 23 are outer edge lines of the bottom plate of the upper box body, and 24 upper box body side plate reinforcing rib central lines.
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Detailed Description
See fig. 1-4. According to the invention, the method comprises the following steps:
step 1: according to the actual use condition of the clamp, the action, shape, weight, rigidity, structural characteristics and material hardness of the part are analyzed, the clamp is decomposed into a plurality of components including a plate, a beam and a reinforcing rib mainly in Z-direction vibration, a geometric model of the clamp is determined, the structural design of the clamp is carried out according to the shape of an antenna skin and test requirements, and an original three-dimensional solid model of the clamp is built: the central axis is installed through a fixture, the circle center of an antenna skin 2 installation hole of a box-shaped skin is projected onto a vibrating table, projection points of the skin installation holes are connected into a fold line 6, an outer edge line 11 of a bottom plate and an inner edge line 12 of the bottom plate are positioned through intersection points of the fold line 6 and the bottom plate hole, the thickness of the bottom plate is assigned to obtain the solid shape of the bottom plate, a countersunk hole is formed in the bottom plate, a workpiece contour line is drawn to serve as a designed model, and a figure plane is arranged to obtain the initial shape of the bottom plate model of the lower antenna box body 1;
step 2: according to the projection center line position of the side plate positioned by the center line 15 of the outer edge line 13 and the inner edge 14 of the bottom plate, the turning point of the inner edge of the bottom plate is used as the standardized horizontal line 16 and the vertical line 17, the horizontal reinforcing rib center line 18 is arranged below the horizontal line 16, the horizontal reinforcing rib center line 18 is positioned at the center line position of the horizontal line of the projection hole of the vibration table 5, the vertical reinforcing rib center line 19 can be obtained by the same method, and then two reinforcing ribs are added on two sides of the vertical reinforcing rib to increase the rigidity of the vibration table. The length of the reinforcing rib is determined by the inner edge and the outer edge of the bottom plate. Assigning thickness to the side plates and the side plate reinforcing ribs, and assigning the height to the side plates to obtain the initial appearance of the side plate model, so as to generate the initial appearance of the side plate of the lower box body of the clamp;
step 3: the central line 19 of the envelope of the antenna box body 1 and the connecting line of the skin mounting holes is used as the inner edge of the side plate of the upper box body 3 and the inner edge line 12 of the bottom plate of the upper box body, the outer edge line 13 of the bottom plate of the lower box body 4 is used as the outer edge line of the bottom plate of the upper box body, the central line 19 and the outer edge line 13 of the bottom plate of the box body are used, the central line 17 of the transverse reinforcing rib of the side plate of the lower box body 4 is cut to obtain the central line 20 of the reinforcing rib of the side plate of the upper box body, the thickness of the reinforcing rib of the bottom plate, the side plate and the height of the side plate are assigned, and the side plate is cut by adopting the lower curved surface of the skin to obtain the initial shape of the model of the upper box body 3.
Step 4: and refining the appearance of the clamp according to engineering application requirements to obtain the final appearance of the clamp, and verifying the reliability of the clamp through finite element simulation.
The implementation steps of the box type skin antenna clamp general design method are discussed in detail by taking a box type vibration clamp for a certain skin antenna as an embodiment, whether the rigidity of the box type skin antenna clamp meets the design requirement is researched based on finite element simulation, and the accuracy of the method is verified, wherein the box type skin antenna mainly comprises an antenna box body 1 and an antenna skin 2, and the clamp mainly comprises an upper box body 3 and a lower box body 4 as shown in fig. 1. The embodiment comprises the following steps:
as shown in fig. 2, step 1: generating the initial shape of the bottom plate of the lower box body of the clamp. The circle center of the antenna skin 2 mounting hole of the box-shaped skin is projected onto the vibrating table, projection points of the skin mounting holes are connected into a fold line 6, a horizontal line 7 and a vertical line 8 passing through the circle center of the vibrating table hole are drawn, and an intersection point 9 (solid circle) of the fold line 6 and the horizontal line and an intersection point 10 (solid square) of the fold line and the vertical line are obtained. The center point of the circular centers of the first vibration table circular holes and the second vibration table circular holes on the left side of the horizontal intersection point 9 is a bottom plate outer edge point 11 (hollow square), the center point of the circular centers of the first vibration table circular holes and the second vibration table circular holes on the right side of the horizontal intersection point 9 is a bottom plate inner edge point 12 (fork-shaped), the center point of the circular centers of the first vibration table circular holes and the second vibration table circular holes on the right side of the horizontal intersection point is a bottom plate outer edge point 11, the center point of the circular centers of the first vibration table circular holes and the second vibration table circular holes on the left side of the right side of the horizontal intersection point is a bottom plate inner edge point 12, and the vertical intersection point 10 is the same as the bottom plate inner edge point 12 and the outer edge point 11. Respectively adopting a linear connection 11 and a bottom plate inner edge point 12 to obtain a bottom plate outer edge line 13 and an inner edge 14, and then assigning a bottom plate thickness to obtain a bottom plate model entity shape of the lower box body 4;
as shown in fig. 3, step 2: and generating the initial shape of the side plate of the lower box body of the clamp. The projection center line position of the side plates is positioned according to the center line 15 of the outer edge line 13 and the inner edge line 14 of the bottom plate, and the turning point of the inner edge of the bottom plate is used as a standardized horizontal line 16 and a vertical line 17. The horizontal line 16 is provided with a horizontal reinforcing rib central line 18 below, the horizontal reinforcing rib central line 18 is positioned at the central line position of the horizontal line of the projection hole of the vibrating table 5, and the vertical reinforcing rib central line 19 is obtained in the same way. And then two reinforcing ribs are added on two sides of the vertical reinforcing rib so as to increase the rigidity of the vibrating table. The length of the reinforcing rib is determined by the inner edge and the outer edge of the bottom plate. And the thickness is assigned to the side plate and the side plate reinforcing rib, and the initial appearance of the side plate model can be obtained by assigning the height to the side plate.
Step 3: an initial profile of the cassette on the clamp is generated. As shown in fig. 4, a projection 20 of the antenna box 1 on the vibrating table 5 and a central line 21 of the skin mounting hole connecting line 6 are taken as an inner edge line of a side plate of the upper box 3 and an inner edge line 22 of a bottom plate of the upper box, an outer edge line 13 of the bottom plate of the lower box 4 is taken as an outer edge line 23 of the bottom plate of the upper box, the outer edge line 23 of the bottom plate of the upper box and the central line 21 of the antenna box, the skin mounting hole connecting line are adopted, the transverse and vertical reinforcing rib central lines 18 and 19 of the side plate of the lower box 4 are cut to obtain an upper box side plate reinforcing rib central line 24, the thickness of the bottom plate, the side plate reinforcing rib is assigned, the height of the side plate is assigned, and the side plate is cut by adopting a skin lower curved surface to obtain the initial appearance of the model of the upper box 3.
Step 4: and refining the appearance of the clamp according to engineering application requirements to obtain the final appearance of the clamp, and verifying the reliability of the clamp through finite element simulation. The first-order mode of the box-type skin antenna vibration experiment clamp designed by the method is larger than 700Hz, and the control error of the acceleration spectrum density value is smaller than +/-3 dB.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, the scope of which is defined in the appended claims, specification and their equivalents.
Claims (4)
1. The method for preparing the vibration test clamp of the universal box-type skin antenna is characterized by comprising the following steps of:
step 1: according to the actual use condition of the clamp, the action, shape, weight, rigidity, structural characteristics and material hardness of the part are analyzed, the clamp is decomposed into plate, beam and reinforcing rib components mainly in Z-direction vibration, the structural design of the clamp is carried out according to the shape of the antenna skin and test requirements, and an original three-dimensional solid model of the clamp is built: the method comprises the steps of installing a central axis through a fixture, projecting the circle center of an antenna skin (2) installing hole of a box-shaped skin onto a vibrating table, connecting projection points of the skin installing holes into a fold line (6), positioning an outer edge line (11) of a bottom plate and an inner edge line (12) of the bottom plate through intersection points of the fold line (6) and a bottom plate hole, assigning a thickness of the bottom plate to obtain a solid shape of the bottom plate, opening a countersunk hole on the bottom plate, drawing a workpiece contour line as a designed model, and arranging a drawing plane to obtain an initial shape of the bottom plate model of a lower antenna box body (1);
step 2: according to the projection center line positions of the side plate positioned by the center lines of the outer edge line (13) and the inner edge (14) of the bottom plate, a horizontal line (15) is drawn by taking the turning point of the inner edge of the bottom plate as a reference, a vertical line (16) taking the turning point of the inner edge of the bottom plate as a reference is positioned, a vertical reinforcing rib center line (17) is positioned, the same is done, a vertical reinforcing rib center line (18) can be obtained, two reinforcing ribs are added on two sides of the vertical reinforcing rib, the thickness is assigned to the side plate and the reinforcing rib of the side plate, and the initial shape of the side plate model of the lower box body can be obtained by assigning the height to the side plate;
step 3: taking a central line (19) of an antenna box body (1) envelope and skin mounting hole connecting line as an inner edge of a side plate of an upper box body (3) and an inner edge line (12) of a bottom plate of the upper box body, taking an outer edge line (13) of a bottom plate of a lower box body (4) as an outer edge line of a bottom plate of the upper box body, adopting the outer edge line (13) and the central line (19) of the bottom plate of the box body, cutting a transverse reinforcing rib central line (17) of the side plate of the lower box body (4) to obtain an upper box body side plate reinforcing rib central line (20), assigning thickness to the bottom plate, the side plate and the side plate reinforcing rib, assigning height to the side plate, and adopting a skin lower curved surface to cut the side plate to obtain an initial shape of the upper box body (3);
step 4: and refining the appearance of the clamp according to engineering application requirements to obtain the final appearance of the clamp, and verifying the reliability of the clamp through finite element simulation.
2. The method of making a universal cassette skin antenna vibration test fixture as defined in claim 1, wherein: projecting the circle centers of the mounting holes of the antenna skins (2) of the box type skins onto a vibrating table, connecting the projection points of the mounting holes of the skins into fold lines (6), and drawing horizontal lines (7) and vertical lines (8) passing through the circle centers of the holes of the vibrating table to obtain intersection points (9) of the fold lines (6) and the horizontal lines and intersection points (10) of the fold lines and the vertical lines; generating the initial shape of the bottom plate of the lower box body of the clamp.
3. The method of making a universal cassette skin antenna vibration test fixture as defined in claim 1, wherein: the center point of the circle centers of the first vibration table circular holes and the second vibration table circular holes on the left side of the horizontal intersection point (9) is a bottom plate outer edge point (11), the center point of the circle centers of the first vibration table circular holes and the second vibration table circular holes on the right side of the left side of the horizontal intersection point is a bottom plate inner edge point (12), the center point of the circle centers of the first vibration table circular holes and the second vibration table circular holes on the right side of the horizontal intersection point is a bottom plate outer edge point (11), and the center point of the circle centers of the first vibration table circular holes and the second vibration table circular holes on the left side of the right side of the horizontal intersection point is a bottom plate inner edge point (12); the vertical intersection points (10) are similarly used for obtaining a bottom plate inner edge point (12) and an outer edge point (11), the bottom plate inner edge point (12) and the bottom plate inner edge point (11) are respectively connected in a straight line, a bottom plate outer edge line (13) and an inner edge (14) are obtained, and then the bottom plate thickness is assigned to obtain the bottom plate model entity appearance of the lower box body (4).
4. The method of making a universal cassette skin antenna vibration test fixture as defined in claim 1, wherein: according to the projection center line position of the side plate positioned by the center line (15) of the outer edge line (13) and the inner edge (14) of the bottom plate, the turning point of the inner edge of the bottom plate is used as the standardized horizontal line (16) and the standardized vertical line (17), the horizontal reinforcing rib center line (18) is arranged below the horizontal line (16), the horizontal reinforcing rib center line (18) is positioned at the center line position of the horizontal line of the projection hole of the vibrating table (5), the vertical reinforcing rib center line (19) can be obtained in the same way, then two reinforcing ribs are added on two sides of the vertical reinforcing rib to increase the rigidity of the vibrating table, the reinforcing rib length determines the thickness of the reinforcing rib assigned to the side plate by the inner edge and the outer edge of the bottom plate, the initial appearance of the side plate model is obtained by the side plate assigned height, and the initial appearance of the side plate of the box body under the clamp is generated.
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