CN108508088B - Radome nondestructive testing device and method based on knocking sound wave method - Google Patents
Radome nondestructive testing device and method based on knocking sound wave method Download PDFInfo
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- CN108508088B CN108508088B CN201810238899.9A CN201810238899A CN108508088B CN 108508088 B CN108508088 B CN 108508088B CN 201810238899 A CN201810238899 A CN 201810238899A CN 108508088 B CN108508088 B CN 108508088B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
Abstract
The invention discloses a radome nondestructive testing device and method based on a knocking sound wave method, and belongs to the technical field of ceramic material nondestructive testing. The nondestructive testing device comprises a sound insulation box 1, a precise electric rotary indexing table 2, an automatic volleyball returning device 3, a sound collecting device 4, a computer control system 5 and a computer data processing system 6. Wherein accurate electronic rotatory dividing table 2, automatic volleyball ball return device 3 and sound collection system 4 all settle in sound-proof box 1, can keep apart external noise interference, portable and carry out the witnessed inspections. The nondestructive testing method is used for positioning and multipoint knocking the radome, and realizing the nondestructive testing of the radome by acquiring sound signals and comparing and analyzing the difference of the sound signals; the invention can carry out positioning detection on the defect position and the defect type, has high automation degree and high accuracy and is slightly influenced by subjective factors.
Description
Technical Field
The invention belongs to the technical field of nondestructive detection of antenna housings, and particularly relates to a nondestructive detection device and method for an antenna housing based on a knocking sound wave method.
Background
In the forming, sintering and processing processes of the antenna housing, due to volume shrinkage, deformation and mechanical impact, each process may cause micro defects such as air holes, micro cracks and the like in the material, the defects may affect the service performance of the material, sometimes may cause stress concentration, and finally may cause fracture or damage. Therefore, the radome product needs to be comprehensively detected to eliminate potential safety hazards.
At present, nondestructive testing methods applied to the antenna housing mainly comprise a lamp inspection method and an ultrasonic testing method, but both methods have certain limitations. For example, the lamp inspection method is a method for judging the quality of a product by visual inspection, which is limited by the visual discrimination accuracy of an inspector and is difficult to detect a minute defect having a size of less than 0.5 mm. The ultrasonic detection method is generally capable of detecting only planar defects on the surface and inside of a material, which are perpendicular to the propagation direction of sound waves, and is difficult to detect the volume-type defects of air holes.
The percussive acoustic wave method is a method for judging defects by using vibration information of an object obtained by percussive. The method is simple and easy to implement, can quickly and effectively detect the defects of cracks, layering and the like, and is commonly applied to the defect detection of railways, fruits, vegetables and woods at present. The conventional knocking tools are a handheld knocking hammer and a pendulum bob, wherein the handheld knocking hammer consumes manpower, and the knocking angle, force and the like are greatly influenced by subjective factors; the pendulum equipment is complex and is easy to generate secondary knocking. The invention provides a method and a device for nondestructive testing of an antenna housing, which combine the traditional knocking sound wave method and computer data analysis to provide an objective and reasonable nondestructive testing method; and designed a device that can strike the full-automatic of radome each point, can intelligent control strike angle and dynamics, the degree of accuracy is high, and it is little influenced by subjective factor, has good application prospect in the aspect of radome nondestructive test.
Disclosure of Invention
The invention provides a radome nondestructive testing device and method based on a knocking sound wave method, the detection device is simple and easy to carry, the detection method is high in accuracy, small in influence of subjective factors, and good in application prospect in the aspect of radome nondestructive testing.
The invention provides a radome nondestructive testing device and method based on a knocking sound wave method.
The detection method is based on the following principle: when the antenna cover has local defects such as microcracks, uneven structure or stress concentration, the sound wave propagation characteristic of the antenna cover can be influenced, and the nondestructive detection of the internal defects of the antenna cover can be realized by comparing and analyzing the sound signal characteristics of the symmetrical points. In order to facilitate fixed-point knocking and comparative analysis, firstly, drawing a coordinate system for the radome, wherein a horizontal line is latitude, and a vertical line is longitude; if the cover body has no defect and uniform structure, the sound signal characteristics of all points at the same latitude are consistent, and if the cover body has internal defects such as microcracks, structural unevenness or stress concentration, the sound signal characteristics of all points at the same latitude are different.
The invention provides a radome nondestructive testing device and method based on a knocking sound wave method, wherein the device comprises: the automatic volleyball returning device comprises a sound insulation box 1, a precise electric rotary indexing table 2, an automatic volleyball returning device 3, a sound collecting device 4, a computer control system 5 and a computer processing system 6. The precise electric rotary indexing table 2, the automatic volleyball returning device 3, the sound collecting device 4 and the computer control system 5 are connected together, and full-automatic fixed-point knocking on different points of the radome can be realized.
Precision electric rotary indexing table 2, automatic volleyball ball return device 3 and sound collection system 4 all arrange in sound-proof box 1, can effectively keep apart external noise interference and convenient to carry do benefit to the witnessed inspections.
Preferably, in the radome nondestructive testing device based on the knocking sound wave method, the bottom of the sound insulation box 1 is provided with a slide way for the precise electric rotary indexing table 2 to slide left and right, so as to ensure that a knocking ball can accurately knock a fixed point; the precise electric rotary indexing table 2 has a precise indexing positioning function, the indexing number can be adjusted to 200 at most, namely 1.8 degrees for one minute, and fixed-point knocking of different longitude points can be realized through automatic positioning rotation of the indexing table; the left side of the sound insulation box 1 is provided with a slideway for the automatic volleyball returning device 3 to move up and down so as to realize knocking of each point at different latitudes; the slide is installed to sound-proof box 1 right side, can supply sound collection system 4 to slide from top to bottom, realizes the collection to antenna house each point sound signal.
Preferably, the radome nondestructive testing device based on the knocking sound wave method, wherein the automatic volleyball returning device 3 comprises an automatic volleyball device and an automatic volleyball returning device. The automatic volleyball device is shown in fig. 2 and comprises a knocking ball 7, a knocking control valve 8, a knocking angle control platform 9 and an intelligent distance meter 10. Wherein the knocking ball 7 is made of metal balls, plastic balls, ceramic balls and the like; the knocking control valve 8 is arranged on the knocking angle control platform 9 and can slide up and down along a slope to realize different knocking ball heights hBall with ball-shaped section(iii) adjustment of (c); the knocking angle control platform 9 is a right trapezoid with a waist length of h and an inclination angle of a right triangle formed by extending two waists of alpha, 0<α<90, and the angle can be freely adjusted; the intelligent distance measuring instrument 10 comprises a laser distance measuring instrument, an ultrasonic distance measuring instrument, an infrared distance measuring instrument and the like and is used for accurately detecting the linear distance l between the front end of the knocking angle control platform 9 and the antenna housing to be knocked in real time.
Preferably, the radome nondestructive testing device based on the knocking sound wave method is characterized in that the material of the knocking ball and the height h of the knocking ball can be adjustedBall with ball-shaped sectionAnd the inclination angle alpha of the knocking angle control platform realizes knocking different angles and different forces of each point of the radome.
Preferably, the radome nondestructive testing device based on the knocking sound wave method is characterized in that the automatic ball returning device is fixed below the automatic ball arranging device, and the knocking ball automatically falls into the ball returning device after being knocked to recover the original position and waits for the next knocking. The automatic ball returning device can effectively prevent secondary knocking and provides guarantee for next automatic knocking.
Preferably, the radome nondestructive testing device based on the knocking sound wave method is characterized in that the sound collection device 4 is a professional electronic tube condenser microphone, and the frequency response is 20HZ to 20kHZIs arranged on a slide way at the right side of the sound insulation box, can slide up and down and always keeps the height h with the knocking pointWeft yarnAnd (5) the consistency is achieved.
Preferably, the radome nondestructive testing device based on the knocking sound wave method, wherein the computer data processing system 6 comprises an audio processing system and a mathematical processing system; the audio processing system comprises Adobe audio, Cool Edit Pro, GoldWave and the like, is always connected with the sound acquisition device 4 in the knocking process, acquires and stores the obtained sound signals of each point, and processes the sound signals to obtain a time domain diagram of each point; the mathematical processing system comprises Matlab, Labview and the like, and a frequency domain graph of each point can be obtained through Fourier transform. The defect conditions of the radome can be obtained by comparing and analyzing the difference between the time domain diagram and the frequency domain diagram of each point, including defect positions, defect sizes, defect shapes and the like.
The using method of the radome nondestructive testing device based on the knocking sound wave method comprises the following steps:
1) turning on a power supply;
2) opening a computer control system and inputting test parameters;
3) drawing a coordinate system for the radome, wherein the horizontal line is latitude, and the vertical line is longitude;
4) knocking the points of the antenna housing with different latitudes and different longitudes at fixed points;
5) collecting sound signals obtained by knocking each point;
6) and comparing and analyzing the sound signals of different longitude points at the same latitude by using a computer data processing system, and further judging the position and the type of the defect of the antenna housing.
The full-automatic knocking process comprises the following steps: (1) the automatic volleyball returning device 3 automatically slides to the latitude h of the point to be measuredWeft yarn(ii) a (2) The precise electric rotary indexing table 2 automatically slides for a distance s, and the sound collection device 4 automatically slides to a corresponding latitude hWeft yarn(ii) a (3) The automatic volleyball returning device 3 automatically knocks and returns to the original position; (4) the precise electric rotary indexing table 2 automatically rotates to the next longitude; (5) the automatic volleyball returning device 3 automatically knocks and returns to the original position until knocking of each point with different longitudes at the latitude is completed; (6) continuously repeating (1) to (5) to realizeKnocking at different latitude points.
Preferably, in the nondestructive testing device for the radome based on the knocking sound wave method, the precise electric rotary dividing table 2 is arranged on a slideway at the bottom of the sound insulation box and can slide left and right, the linear distance l between the front end of the knocking angle control platform 9 and the radome to be knocked is adjusted, and when the latitude of the point to be knocked is 0, l should meet the requirement
When the latitude of the point to be measured is hWeft yarnWhen l is turned on>l0The precise electric rotary indexing table 2 automatically slides leftwards for a distance s equal to hWeft yarntan theta to ensure the accurate knocking of the knocking ball on the point to be measured. The diameter of the table surface of the precise electric rotary indexing table 2 is larger than or equal to the diameter of the bottom of the antenna housing, and the table surface coincides with the rotation axis of the antenna housing when placed.
The invention has the following advantages and characteristics:
the method can realize the positioning detection of the antenna housing by the fixed-point knocking of different latitude and longitude points, and judge the defect position, the defect type and the like of the antenna housing;
the device of the invention connects devices such as knocking acquisition devices together through the control system, has the full-automatic fixed-point knocking function, and has high automation degree, high speed and high accuracy;
the device of the invention centralizes devices such as knocking acquisition devices and the like in the sound insulation box, can effectively eliminate external noise and is convenient to carry and beneficial to on-site detection;
the device can carry out knocking detection on materials with different angles and different forces on materials with different angles by adjusting the materials of knocking balls, the height of the knocking balls and the inclination angle of the knocking angle control platform;
the automatic volleyball returning device can effectively avoid secondary knocking, provides guarantee for automatic knocking and has high automatic knocking efficiency.
Drawings
Fig. 1 is a schematic diagram of a radome nondestructive testing device based on a knocking sound wave method.
FIG. 2 is a schematic view of an automatic volleyball apparatus according to the present invention
Fig. 3 is a frequency domain diagram of radome tapping according to embodiment 1 of the present invention.
Fig. 4 is a frequency domain diagram of radome tapping in embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Fig. 1 shows a radome nondestructive testing apparatus based on a knocked sound wave method, which includes: the automatic volleyball returning device comprises a sound insulation box 1, a precise electric rotary indexing table 2, an automatic volleyball returning device 3, a sound collecting device 4, a computer control system 5 and a computer processing system 6.
The length, the width and the height of the sound insulation box are respectively 1 m; the knocking ball adopts a polytetrafluoroethylene ball with the diameter of 1 cm; the microphone adopts 4189 of Denmark B & K company; the signal adapter adopts 1704-C-102 of Denmark B & K company; AdobeAudition3.0 is adopted by audio processing software; math processing software adopts matlab, see FIG. 1
(1) Turning on a power supply; (2) opening a computer control system, and inputting test parameters: the radius R of the radome is 15cm, the half apex angle θ is 30 °, the inclination angle α of the knocking angle control platform 9 is 30 °, the waist length h is 1cm, and h isBall with ball-shaped section2cm, 5cm in latitude interval and 9 in division number of the precise electric rotary dividing table; (3) clicking reset, resetting the automatic volleyball returning device to h Weft yarn0; the sound collection device 4 is reset to h Weft yarn0; the axis of the precise electric rotary indexing table is reset to
(4) Clicking start, opening the knocking control valve 8, automatically knocking and returning the knocking ball to the original position, rotating the precise electric rotary indexing table by 40 degrees, opening the knocking control valve 8 again, automatically knocking and returning the knocking ball to the original position, and repeatedly knocking for 9 times; the automatic volleyball returning device 3 slides upwards to hWeft yarnAt 5cm, the sound collection device 4 slides correspondingly to hWeft yarnThe axis of the precise electric rotary indexing table moves leftwards at 5cm
Tapping was continued for 9 times. Knocking and sounding 9 points at five latitudes of 0cm, 5cm, 15cm, 20cm and 25cm in sequence; in fig. 2, 10 is an infrared distance meter, which can accurately detect the linear distance l between the front end of the knocking angle control platform 9 and the radome to be knocked in real time. (5) Acquiring and storing the acquired 45-point sound signals through Adobe Audio 3.0 software to obtain a time domain diagram of the signals; (6) fourier transform is carried out on the signals of all points through matlab to obtain a frequency domain diagram of the signals; (7) and judging the defect condition of the radome by comparing and analyzing the difference between the time domain graph and the frequency domain graph of 9 points at the same latitude.
FIG. 3 is a graph of the antenna radome strike frequency domain of example 1
The figure shows a frequency domain diagram of each point when the latitude is 5cm, and the figure shows that the points have obvious difference at 2153HZ, which indicates that the radome has defects at the latitude. And during subsequent high-temperature tensile test, the radome is broken at a position 5cm away from the bottom, so that the defect detection of the radome is successfully realized by the method.
Example 2
The antenna housing nondestructive testing device based on the knocking sound wave method shown in fig. 1 comprises: the automatic volleyball returning device comprises a sound insulation box 1, a precise electric rotary indexing table 2, an automatic volleyball returning device 3, a sound collecting device 4, a computer control system 5 and a computer processing system 6.
The length, the width and the height of the sound insulation box are respectively 1 m; the knocking ball adopts a polytetrafluoroethylene ball with the diameter of 1 cm; the microphone adopts 4189 of Denmark B & K company; the signal adapter adopts 1704-C-102 of Denmark B & K company; AdobeAudition3.0 is adopted by audio processing software; math processing software adopts matlab.
(1) Turning on a power supply; (2) opening a computer control system, and inputting test parameters: the radius R of the radome is 30cm, the half apex angle θ is 30 °, the inclination angle α of the knocking angle control platform 9 is 30 °, the waist length h is 1cm, and h is 1cmBall with ball-shaped section2cm, 10cm in latitude interval and 9 in division number of the precise electric rotary dividing table; (3) clicking reset, resetting the automatic volleyball returning device to h Weft yarn0; the sound collection device 4 is reset to h Weft yarn0; the axis of the precise electric rotary indexing table is reset to
(4) Clicking start, opening the knocking control valve 8, automatically knocking and returning the knocking ball to the original position, rotating the precise electric rotary indexing table by 40 degrees, opening the knocking control valve 8 again, automatically knocking and returning the knocking ball to the original position, and repeatedly knocking for 9 times; the automatic volleyball returning device 3 slides upwards to hWeft yarnThe sound collection device 4 slides correspondingly to h 10cmWeft yarnThe axle center of the precise electric rotary indexing table moves leftwards at 10cm
Tapping was continued for 9 times. Knocking and sounding 9 points at six latitudes of 0cm, 10cm, 20cm, 30cm, 40cm and 50cm in sequence; in fig. 2, 10 is an infrared distance meter, which can accurately detect the linear distance l between the front end of the knocking angle control platform 9 and the radome to be knocked in real time. (5) Collecting and storing the collected 54-point sound signals through Adobe Audio 3.0 software to obtain a time domain diagram of the signals; (6) fourier transform is carried out on the signals of all points through matlab to obtain a frequency domain diagram of the signals; (7) and judging the defect condition of the radome by comparing and analyzing the difference between the time domain graph and the frequency domain graph of 9 points at the same latitude. Fig. 4 is a spectrum diagram of each point 20cm away from the bottom of the radome, and it can be seen from the diagram that frequency domain diagrams of each point are consistent, and time domain diagrams and frequency domain diagrams of other latitudes are also consistent, which indicates that the radome is defect-free. The antenna housing is not broken in the subsequent high-temperature tensile test, and the detection result of the detection method is proved to be credible.
The above embodiments describe the technical solutions of the present invention in detail. It will be clear that the invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various changes, but any changes equivalent or similar to the present invention are within the protection scope of the present invention.
Claims (8)
1. A radome nondestructive testing device based on a knocking sound wave method is characterized by comprising a sound insulation box and a precise electric rotary screwThe automatic volleyball returning device comprises a rotary table, an automatic volleyball returning device, a sound collecting device, a computer control system and a computer data processing system; the precise electric rotary indexing table, the automatic volleyball returning device and the sound collecting device are connected with a computer control system; the precise electric rotary indexing table is fixed on the bottom slideway of the sound insulation box and can move left and right, and when the latitude of the point to be detected is hWeft yarnWhen the precise electric rotary indexing table automatically slides leftwards for a distance s equal to hWeft yarntan theta, theta is a half vertex angle of the antenna housing; the precise electric rotary indexing table, the automatic volleyball returning device and the sound collecting device are all arranged in the sound insulation box, so that external noise interference can be effectively isolated, and the carrying is convenient.
2. The device according to claim 1, wherein the precise electric rotary indexing table has a precise indexing positioning function, and the fixed-point knocking of different longitude points can be realized through the automatic rotation of the indexing table; the diameter of the table top of the rotary table is larger than or equal to the diameter of the bottom of the antenna housing, and the diameter of the table top of the rotary table coincides with the rotation axis of the antenna housing when the rotary table is placed.
3. The apparatus of claim 1, wherein the automatic volleyball returning apparatus comprises an automatic volleyball apparatus and an automatic volleyball returning apparatus; the automatic volleyball device comprises a knocking ball, a knocking control valve, a knocking angle control platform and an intelligent distance meter; the knocking control valve is arranged on the knocking angle control platform, and after the knocking control valve is opened, the knocking ball automatically slides downwards to knock and then falls into the automatic ball returning device to return to the original position; the knocking ball is selected from metal balls, plastic balls and ceramic balls.
4. The apparatus of claim 1, wherein the sound collection means is a tube condenser microphone having a frequency response of 20HZ to 20kHZ, and is mounted on a slide rail on the right side of the soundproof case to be slidable up and down while maintaining a height h from the hitting pointWeft yarnAnd (5) the consistency is achieved.
5. The apparatus of claim 1, wherein the computer data processing system comprises an audio processing system and a math processing system; the audio processing system comprises Adobe audio, Cool Edit Pro and GoldWave, and is used for collecting and storing the obtained sound signals of each point in the knocking process and processing the sound signals to obtain a time domain graph of each point; the mathematical processing system comprises Matlab and Labview, and a frequency domain graph of each point is obtained through Fourier transformation.
6. A radome nondestructive testing method based on a knocking sound wave method is characterized in that the device of any one of claims 1 to 5 is used for positioning and multipoint knocking a radome, collecting sound signals, comparing and analyzing the difference of the sound signals, and carrying out nondestructive testing on radome defect positions and defect types, and comprises the following steps:
1) turning on a power supply;
2) opening a computer control system and inputting test parameters;
3) drawing a coordinate system for the radome, wherein the horizontal line is latitude, and the vertical line is longitude;
4) knocking the points of the antenna housing with different latitudes and different longitudes at fixed points;
5) collecting sound signals obtained by knocking each point;
6) and comparing and analyzing the sound signals of different longitude points at the same latitude by using a computer data processing system, and further judging the position and the type of the defect of the antenna housing.
7. The method of claim 6, wherein the pointing stroke of step 4) is operated by a computer control system, comprising the steps of:
(1) automatic volleyball returning device automatically slides to latitude h to be measuredWeft yarn；
(2) The precise electric rotary indexing table automatically slides for a distance s, and the sound acquisition device automatically slides to a corresponding latitude hWeft yarn；
(3) The automatic volleyball returning device automatically knocks and returns to the original position;
(4) the precise electric rotary indexing table automatically rotates to the next longitude;
(5) the automatic volleyball returning device automatically knocks and returns to the original position until knocking of points with different longitudes at the latitude is completed;
(6) and (5) repeating the steps (1) to (5) to realize the knocking of each point at different latitudes.
8. The method according to claim 7, wherein the precise electric rotary indexing table in the step (4) is arranged on a slideway at the bottom of the sound insulation box and can slide left and right, the linear distance l between the front end of the knocking angle control platform and the antenna housing to be knocked is adjusted, and when the latitude of the point to be knocked is 0, l is satisfied
When the latitude of the point to be measured is hWeft yarnWhen l is turned on>l0The automatic leftward sliding distance s of the precise electric rotary indexing table is hWeft yarntan theta is used for ensuring accurate knocking of the knocking ball on the point to be measured; wherein
hBall with ball-shaped sectionH is the waist length of the knocking angle control platform, alpha is the inclination angle of the knocking angle control platform, and h is the height of the knocking ballWeft yarnThe height of the knocking point of the automatic volleyball returning device is set as h when the latitude of the point to be detected is set asWeft yarnAnd s is the automatic sliding distance of the precise electric rotary indexing table.
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| CN109387565A (en) * | 2018-10-12 | 2019-02-26 | 山东理工大学 | A method of brake block internal flaw is detected by analysis voice signal |
| CN111257421A (en) * | 2020-02-21 | 2020-06-09 | 河南科技大学 | Visual imaging system for composite material knocking detection result |
| CN111208200B (en) * | 2020-02-28 | 2020-10-20 | 北京理工大学 | Ti-Al alloy liner structure consistency detection device and detection method |
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