CN113607347A - Method and device for detecting leakage of vacuum hot-press molding composite armor material - Google Patents
Method and device for detecting leakage of vacuum hot-press molding composite armor material Download PDFInfo
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Abstract
The invention provides a method for detecting leakage of a vacuum hot-press molding composite armor material, which is characterized in that a vacuum pump is used for vacuumizing the vacuum hot-press molding composite armor material, an ultrasonic probe is used for collecting ultrasonic signals of the vacuum hot-press molding composite armor material, the collected ultrasonic signals are subjected to data processing, and calculation in a time domain is converted into frequency domain Fast Fourier Transform (FFT) and inverse FFT IFFT. The invention also provides a device for detecting the leakage of the vacuum hot-press molding composite armor material, which consists of a detection host and an internal pressure terminal, wherein the detection host comprises an ultrasonic probe, a receiving and conditioning module, a collecting module, an FPGA (field programmable gate array), a computer system, a wireless module and an external pressure measuring module, and the internal pressure terminal comprises an internal pressure measuring module, a wireless module and a microprocessor. The detection method and the device have the advantages of wide application range of detection materials, simple composition, convenient installation and use, and capability of realizing leakage characterization, leakage aperture and leak hole positioning description of the composite armor material.
Description
Technical Field
The invention belongs to the technical field of material detection, and particularly relates to a method and a device for detecting leakage of a vacuum hot-press molding composite armor material.
Background
The armored chariot is an important weapon equipment, and with the development of the weapon equipment, homogeneous armor made of a single material cannot meet the requirements of an actual battlefield, and then armor materials made of composite materials are brought. The composite armor material is a multilayer armor which is formed by compounding a plurality of materials with different physical and mechanical properties in a certain mode. Compared with homogeneous armor, the composite armor has the advantages of small surface density, thin target plate, certain designability of structure and performance, high modularization degree and convenience in maintenance and repair.
After the 20 th century and the 60 th era, the composite armor gradually becomes the mainstream of the armor protection field, mainly benefits from the application of ceramic materials, has the advantages of low density, high strength, low price, easy preparation and the like, becomes one of the most common materials in the composite armor protection field, and the ceramic composite armor is widely applied in the armor protection field due to higher protection performance. Until now, ceramic composite armors are still important components in the protection of weapon systems such as tanks, armored chariot, armed helicopters, ships and naval vessels, and the like.
The vacuum hot-press molding composite armor material is a commonly used ceramic composite armor material, and is vacuumized during hot-press molding, if the vacuum degree does not reach the standard, or the soft film layer is not filled in the gaps of the ceramic particle layer during melting, a leak hole can be generated, and the protective performance of the armor can be greatly influenced by the leak hole. Therefore, the airtightness of the vacuum hot-press molding composite armor material needs to be detected, and qualitative description of the existence of leakage, equivalent description of a leak hole and positioning description of the leak hole are realized, so that the preparation process is improved, and the protective performance of the armor is ensured.
The research on the airtight detection technology of the composite material forming mold in the literature of Zhengwei waves, Zhang Yongbing soldiers, Zhang wavelet and Zhouyao introduces that a static boosting method is adopted in a hot pressing tank to detect the airtightness of the composite material forming mold, so that the qualitative judgment on the existence of leakage is realized, the description on the equivalent of a leak hole cannot be realized, and the description on the location of the leak hole cannot be realized;
the document of Zshuqing, Shiyuehua, Xuhong and Chidong gore, the application of a chaotic weak signal detection method in an ultrasonic leakage detection system, introduces an oil and gas pipeline leakage detection system, and belongs to positive pressure difference jet flow;
the document 'discussion on gas leakage detection technology based on ultrasonic technology' of Li season, Zhao laughing han and Du gang introduces a petroleum pipeline leakage detection system, belonging to positive pressure difference jet flow;
a gas leakage detection method is introduced in a gas leakage detection system of Dorsemin, Dinglina and Jade, belonging to positive pressure difference jet flow;
the document "research and implementation of ultrasonic detection system for tiny leakage signal" of Zhang Yu introduces a method for gas leakage in pipeline, which belongs to positive pressure difference jet flow.
According to the available data: generating ultrasound aiming at the positive pressure difference jet flow to realize leakage detection; or the ultrasonic is generated aiming at the negative pressure difference suction flow, and only the qualitative description of whether the leakage exists or not, the description of the equivalent weight of the leak hole and the description of the positioning of the leak hole can be realized.
Disclosure of Invention
If the pressure container is filled with gas, the gas can be flushed out of the leakage hole once the container has the leakage hole due to the large difference between the internal pressure and the external pressure. When the leak hole size is smaller and the Reynolds number is higher, the flushed gas forms turbulence, the turbulence can generate sound waves with certain frequency near the leak hole, the sound wave frequency is related to the leak hole size, when the leak hole is larger, the human ear can hear the air leakage sound, when the leak hole is smaller and the sound wave frequency is more than 20kHz, the human ear can not hear the air leakage sound, but the air leakage sound can be transmitted in the air, and the no-load ultrasonic wave is called. The ultrasonic waves are high frequency short waves, the intensity of which decays with increasing distance from the leak. The directivity of the ultrasonic wave is strong, and whether leakage occurs can be judged. Typically, the pressure vessel is at a pressure greater than ambient (typically atmospheric) pressure and the orifice produces a jet of positive differential pressure. The vacuum hot-press molding composite armor material is a sealing material, and is vacuumized during hot-press molding, and if the vacuum degree does not reach the standard or the gaps of the ceramic particle layers are not filled up during melting of the soft film layer, a leak hole is generated. And (3) vacuumizing the vacuum hot-press molding composite armor material at room temperature, wherein if a leak hole exists, the leak hole generates negative pressure difference suction flow, sound waves are generated nearby the leak hole, and the sound wave characteristics are completely consistent with those generated by positive pressure difference jet flow.
In order to solve the technical problems in the background art, the invention provides a method and a device for detecting leakage of a vacuum hot-press molding composite armor material based on the principle, and can realize qualitative description of the existence of leakage, equivalent description of a leak hole and positioning description of the leak hole by generating ultrasonic waves aiming at negative pressure difference suction flow. The technical scheme adopted by the invention is as follows:
a method for detecting leakage of a vacuum hot-press molding composite armor material comprises the following steps:
step 1, vacuumizing a vacuum hot-press molding composite armor material by using a vacuum pump, generating ultrasonic aiming at negative pressure difference suction flow, and monitoring and adjusting the vacuumizing pressure of the vacuum pump in real time;
and 3, carrying out data processing on the acquired ultrasonic signals, converting the calculation in the time domain into the frequency domain to obtain Fast Fourier Transform (FFT) and inverse FFT IFFT, obtaining an effective value and a Euclidean distance of a real part, judging whether leakage exists or not according to the Euclidean distance, and calculating the size of a leakage aperture if leakage exists.
The method continuously adjusts and changes the distance between the ultrasonic probe and the vacuum hot-press molding composite armor material, obtains the pressure at the leakage hole by using the pressure sensor, and can realize qualitative description of whether the vacuum hot-press molding composite armor material leaks, description of the leakage aperture and positioning description of the leakage hole through data processing.
A detection device for leakage of a vacuum hot-press molding composite armor material applies the detection method, and comprises the following steps: the system comprises a vacuum pump, a detection host and an internal pressure terminal, wherein the detection host is in wireless communication with the internal pressure terminal; the vacuum pump enables the composite armor material to generate negative pressure difference, the internal pressure terminal measures and processes the negative pressure difference data of the composite armor material, the detection host machine collects and processes ultrasonic signals, and the detection host machine calculates and completes qualitative description of whether leakage exists, leakage aperture description and leakage hole positioning description according to the ultrasonic signals.
The invention has the beneficial effects that:
the method and the device for detecting the leakage of the vacuum hot-press molding composite armor material can realize qualitative description of the existence of the leakage of the vacuum hot-press molding composite armor material, leakage aperture description and leakage hole positioning description, and have the advantages of wide application range of detection materials, simple composition and convenient installation and use.
Drawings
FIG. 1 is a schematic structural view of a vacuum hot press molded composite armor material.
FIG. 2 is a flow chart of a method for detecting leakage of a vacuum hot press molded composite armor material.
Fig. 3 is a schematic diagram of a detection host machine of the detection device facing the leakage of the vacuum hot-press molding composite armor material.
Fig. 4 is a schematic view of the combination of internal pressure terminals facing a vacuum hot press formed composite armor material leak detection device.
Fig. 5 is a schematic view of connection between a detection host and a workpiece material of the detection device facing the leakage of the vacuum hot press molding composite armor material.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vacuum hot-press molding composite armor material, including: the ceramic particle coating comprises a first steel layer 1, a first soft film layer 2, a ceramic particle layer 3, a second soft film layer 4 and a second steel layer 5. Wherein: the first steel layer 1 and the second steel layer 5 are made of light seamless steel; the first soft film layer 2 and the second soft film layer 4 are made of non-metal materials and are melted at about 200 ℃; the ceramic particle layer 3 is made of ceramic materials and is in a particle shape.
Referring to fig. 2, fig. 2 is a flow chart of a method for detecting leakage of a vacuum hot press formed composite armor material. A method for detecting leakage of a vacuum hot-press molding composite armor material comprises the following steps:
step 1, vacuumizing the vacuum hot-press molding composite armor material by using a vacuum pump, generating ultrasonic aiming at negative pressure difference suction flow, and monitoring and adjusting the vacuumizing pressure of the vacuum pump in real time. The composite armor material is reserved with an exhaust pipe, and the exhaust pipe is connected with a vacuum pump and can vacuumize the armor material.
And 2, acquiring ultrasonic signals for the vacuum hot-press molding composite armor material by using an ultrasonic probe. During the detection process, the ultrasonic probe and the armor material keep a constant distance and move along the detection area. The leakage hole can generate ultrasonic wave during vacuum pumping, and the ultrasonic wave can be received by the ultrasonic probe in the outward propagation process.
And 3, carrying out data processing on the acquired ultrasonic signals, and converting the calculation in the time domain into frequency domain Fast Fourier Transform (FFT) and inverse FFT IFFT.
When the quality of the produced composite armor product is detected, in order to realize qualitative description of leakage existence of ultrasonic data, an algorithm for describing the leakage aperture comprises the following steps: the aperture utilizes fast correlation algorithm based on FFT (fast Fourier transform), because the cross correlation result of two sequences in time domain is equal to the inverse Fourier transform of the product of the conjugate of one sequence and the other sequence in frequency domain, the correlation calculation in time domain can be converted into frequency domain to obtain Fast Fourier Transform (FFT) and inverse FFT (IFFT), thereby greatly reducing the process of linear multiply-accumulate and improving the operation speed. The method specifically comprises the following steps:
s3.1, continuously acquiring five groups of ultrasonic data and respectively recording the five groups of ultrasonic data as x1(i)，x2(i)，x3(i)，x4(i)，x5(i) Wherein i is the number of sampling points, and the range of i is 1-8192;
s3.2, performing FFT (fast Fourier transform) on the five groups of data respectively, and recording as follows: x1(i)＝FFT(x1(i))，X2(i)＝FFT(x2(i))，X3(i)＝FFT(x3(i))，X4(i)＝FFT(x4(i))，X5(i)＝FFT(x5(i))；
S3.3, respectively taking conjugation for FFT transformation of the first four groups of data, and respectively recording as: x1 ＊(i)，X2 ＊(i)，X3 ＊i)，X4 ＊(i)；
S3.4, to X1 ＊(i) And X2(i) Product of (A), X2 ＊(i) And X3(i) Product of (A), X3 ＊(i) And X4(i) Product of (A), X4 ＊(i) And X5(i) The inverse FFT is calculated for each product, and is respectively recorded as: y is1(i)＝IFFT(X1 ＊(i)*X2(i))，y2(i)＝IFFT(X2 ＊(i)*X3(i))，y3(i)＝IFFT(X3 ＊(i)*X4(i))，y4(i)＝IFFT(X4 ＊(i)*X5(i))；
S3.5, respectively obtaining y1(i)、y2(i)、y3(i) And y4(i) Effective values of the real part, and are respectively denoted as RMS1、RMS2、RMS3、RMS4The calculation formula of the effective value is as follows:
re in the formula2(yk(i) ) represents the finding of y1(i) The square of the real part;
wherein, N is the number of sampling points, k is the serial numbers 1, 2, 3 and 4 of the inverse transformation and effective values of the four groups of FFT;
therefore, the effective value of the signal cross-correlation is obtained, and only the basis for distinguishing the leakage aperture is obtained, and the qualitative description of the existence of the leakage, the leakage aperture description and the leakage aperture positioning description can be realized by means of the effective value of the standard leakage aperture signal cross-correlation. The cross-correlation effective value algorithm of the standard leak signals is consistent with that of the leak detection device for the vacuum hot-press molding-oriented composite armor material;
by means of a calibration system of a detection method facing to the leakage of the vacuum hot-press molding composite armor material, the effective values of the cross-correlation of standard leakage holes with the standard hole diameters of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1.0mm are obtained and recorded as: CRMSmM is an integer of 0 to 10; CRMSmUsing RMS in S3.5kCalculating formula, and marking as CRMS for distinguishing from leakage hole to be detectedm. The calibration system is a general scale and a standard scale, and is common in the detection and measurement fields, the measuring range of the calibration system is larger than that of the system to be calibrated, and the precision of the calibration system is higher than that of the system to be calibrated.
The effective value of the cross-correlation of the leakage aperture signals to be measured is recorded as XRMSkK is an integer of 1 to 4; XRMSkUsing RMS in S3.5kCalculating formula, and marking as XRMS for distinguishing from standard leak holem。
S3.6, solving the Euclidean distance for the cross-correlation effective value of the leakage aperture signal to be detected and the cross-correlation effective value of the standard leakage aperture signal:
to this end, 11 sets of Euclidean distances, D, were obtained0To D10；
S3.7, taking D by comparing sizes0To D10Minimum value of DminAnd storing a subscript p of the Euclidean distance at the moment; such as D1At minimum, p is 1; such as D2At minimum, p is 2; by analogy, p is an integer of 0-10;
s3.8, if p is greater than 0, judging that leakage exists, and turning to S3.9, wherein the leakage hole diameter d is 0.1 × p; otherwise, no leakage exists, finishing qualitative description of whether leakage exists, and turning to S3.11;
s3.9, moving the ultrasonic probe leftwards firstly, if D isminIncreasing the size, turning to S3.10, otherwise, continuing to move the ultrasonic probe leftwards until DminEnlarging, finishing qualitative description of existence of leakage, leakage aperture description and leakage hole positioning description, and turning to S3.11; the starting point during the test is not required, namely the starting point is the starting detection point, but the starting point must be selected in an effective detection area of the ultrasonic probe, the end point is detected, and the scanning of a complete detection area must be ensured;
s3.10, move the ultrasonic probe to the right, if DminIncreasing the size, turning to S3.11, otherwise, continuing to move the ultrasonic probe to the right until DminEnlarging, finishing qualitative description of existence or nonexistence of leakage, leakage aperture description and leakage hole positioning description, finding a leakage hole, realizing leakage hole positioning, and turning to S3.11;
and S3.11, continuously moving the ultrasonic probe forwards, moving and judging at the same time until the detection of the leakage of the whole vacuum hot press molding composite armor material is completed. Because the inspection process is moving the probe from back to front, followed by areas that have already been inspected, and followed by areas that are being inspected or that have not yet been inspected.
A detection device for leakage of a vacuum hot-press molding composite armor material applies the detection method, and comprises the following steps: the system comprises a vacuum pump, a detection host and an internal pressure terminal, wherein the detection host and the internal pressure terminal are in wireless communication to realize wireless data interaction. The vacuum pump enables the composite armor material to generate negative pressure difference, the internal pressure terminal measures and processes the negative pressure difference data of the composite armor material, the detection host machine collects and processes ultrasonic signals, and the detection host machine calculates and completes qualitative description of whether leakage exists, leakage aperture description and leakage hole positioning description according to the ultrasonic signals.
Referring to fig. 3, fig. 3 is a schematic diagram of a detection host of the detection device for detecting leakage of vacuum hot-press formed composite armor material according to the present invention. The detection host computer includes: the ultrasonic probe 11, the receiving and conditioning module 12, the acquisition module 13, the FPGA14 and the computer system 15 are connected in sequence, and the computer system 15 is respectively connected with the first wireless module 16 and the outer pressure measuring module 17. Wherein:
the ultrasonic probe 11 adopts a piezoelectric ultrasonic transducer with a center frequency of 40kHz to realize signal receiving of ultrasonic generated by negative pressure difference suction flow;
the receiving and conditioning module 12 implements hardware circuit processing of the ultrasonic signal received by the ultrasonic probe 11, and includes: such as impedance matching, first-stage amplification, notch, second-stage amplification, band-pass filtering, and final-stage amplification;
the acquisition module 13 is configured to implement AD acquisition of the final-stage amplified signal of the receiving and conditioning module 12; the acquisition module 13 can realize continuous acquisition and intermittent acquisition;
the FPGA14 is used for controlling the acquisition module 13 and realizing bidirectional communication with the computer system 15 through a communication interface;
the computer system 15 is provided with visualization software, and utilizes the communication interface to realize bidirectional communication with the FPGA14, the communication interface to realize bidirectional communication with the first wireless module 16, and the communication interface to realize bidirectional communication with the outer pressure measurement module 17. The external pressure refers to the ambient pressure outside the composite armor material, typically atmospheric pressure; the internal pressure refers to the vacuum pump pumping pressure.
The computer system 15 realizes bidirectional communication with the FPGA14 by using a communication interface, on one hand, the control and parameter setting of the FPGA14 are realized, and on the other hand, the state, information, ultrasonic data and the like are acquired from the FPGA 14; the computer system 15 realizes bidirectional communication with the first wireless module 16 by using the communication interface, on one hand, the control of a pressure terminal in the vacuum hot-press molding composite armor material leakage detection device, the acquisition of internal pressure data and the like are realized; the computer system 15 utilizes a communication interface to realize bidirectional communication with the external pressure measurement module 17, and realizes external pressure data acquisition, parameter setting and control of the external pressure measurement module 17 and the like; the computer system 15 performs data processing according to algorithms such as signal cross-correlation and the like, obtains qualitative description of whether the vacuum hot-press molding composite armor material leaks, description of the leakage aperture and positioning description of the leakage aperture, and can realize functions of storage, display, query, playback and the like.
The first wireless module 16 is connected with the computer system 15 through a communication interface, the first wireless module 16 establishes a communication bridge (wireless communication between the first wireless module 16 and the second wireless module 22) facing a detection host of the detection device for the leakage of the vacuum hot-press molding composite armor material and an internal pressure terminal, and the detection host of the detection device for the leakage of the vacuum hot-press molding composite armor material through the first wireless module 16 realizes control, setting, state acquisition, internal pressure acquisition and the like of the internal pressure terminal;
the external pressure measuring module 17 is connected with the computer system 15 through a communication interface, the external pressure measuring module 17 sends the obtained external pressure to the computer system 15 through the communication interface, and the computer system 15 realizes control, setting, state obtaining and the like of the external pressure measuring module 17 through the communication interface.
Referring to fig. 4, the internal pressure terminal of the device for detecting leakage of vacuum hot press molding composite armor material includes: the pressure measuring device comprises an internal pressure measuring module 21, a second wireless module 22 and a microprocessor 23, wherein the microprocessor 23 is respectively connected with the internal pressure measuring module 21 and the second wireless module 22. Wherein:
the internal pressure measuring module 21 is connected with the microprocessor 23 through a communication interface, the internal pressure measuring module 21 sends the obtained internal pressure to the microprocessor 23 through the communication interface, and the microprocessor 23 realizes control, setting, state obtaining and the like of the internal pressure measuring module 21 through the communication interface; the internal and external pressures are generally unequal.
The second wireless module 22 is connected with the microprocessor 23 through a communication interface, the second wireless module 22 establishes a communication bridge between a detection host facing the detection device for detecting the leakage of the vacuum hot-press molding composite armor material and the internal pressure terminal, and the detection host facing the detection device for detecting the leakage of the vacuum hot-press molding composite armor material realizes control, setting, state acquisition, internal pressure acquisition and the like of the internal pressure terminal through the second wireless module 22;
the microprocessor 23 realizes bidirectional communication with the second wireless module 22 by using a communication interface, and on one hand, realizes control of a pressure terminal in the composite armor material leakage detection device facing vacuum hot press molding, and the like; the microprocessor 23 realizes bidirectional communication with the internal pressure measuring module 21 by using the communication interface, and realizes internal pressure data acquisition, parameter setting and control of the internal pressure measuring module 21 and the like.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating connection between a leak detection device for vacuum hot press molding of a composite armor material and a workpiece material, and a vacuum pump 32 and a detection host 33 perform leak detection on the workpiece material 31. Wherein: the workpiece material 31, i.e., the vacuum hot press formed composite armor material of fig. 1; when the vacuum pump 32 is used for leakage detection, the vacuum hot-press molding composite armor material is vacuumized to provide a negative pressure environment; the detection host 33, namely the detection host facing the detection apparatus for detecting the leakage of the vacuum hot press molding composite armor material shown in fig. 2, obtains the leakage information from the workpiece material 31 through the ultrasonic probe 11 by the detection host 33. The vacuum pump 32 is provided with an internal pressure terminal which is wirelessly connected with the detection host machine, and the internal pressure terminal provides pressure data, namely an internal pressure value, for the detection host machine.
Claims (9)
1. The method for detecting the leakage of the vacuum hot-press molding composite armor material is characterized by comprising the following steps of:
step 1, vacuumizing a vacuum hot-press molding composite armor material by using a vacuum pump, generating ultrasonic aiming at negative pressure difference suction flow, and monitoring and adjusting the vacuumizing pressure of the vacuum pump in real time;
step 2, collecting ultrasonic signals for the vacuum hot-press molding composite armor material by using an ultrasonic probe;
and 3, carrying out data processing on the acquired ultrasonic signals, converting the calculation in the time domain into the frequency domain to obtain Fast Fourier Transform (FFT) and inverse FFT IFFT, obtaining an effective value and a Euclidean distance of a real part, judging whether leakage exists or not according to the Euclidean distance, and calculating the size of a leakage aperture if leakage exists.
2. The method for detecting the leakage of the vacuum hot press molding-oriented composite armor material according to claim 1, wherein the step 3 specifically comprises the following steps:
s3.1, continuously acquiring five groups of ultrasonic data and respectively recording the five groups of ultrasonic data as x1(i)，x2(i)，x3(i)，x4(i)，x5(i) Wherein i is the number of sampling points, and the range of i is 1-8192;
s3.2, performing FFT (fast Fourier transform) on the five groups of data respectively, and recording as follows: x1(i)＝FFT(x1(i))，X2(i)＝FFT(x2(i))，X3(i)＝FFT(x3(i))，X4(i)＝FFT(x4(i))，X5(i)＝FFT(x5(i))；
S3.3, respectively taking conjugation for FFT transformation of the first four groups of data, and respectively recording as: x1 *(i)，X2 *(i)，X3 *i)，X4 *(i)；
S3.4, to X1 *(i) And X2(i) Product of (A), X2 *(i) And X3(i) Product of (A), X3 *(i) And X4(i) Product of (A), X4 *(i) And X5(i) The inverse FFT is calculated for each product, and is respectively recorded as: y is1(i)＝IFFT(X1 *(i)*X2(i))，y2(i)＝IFFT(X2 *(i)*X3(i))，y3(i)＝IFFT(X3 *(i)*X4(i))，y4(i)＝IFFT(X4 *(i)*X5(i))；
S3.5, respectively obtaining y1(i)、y2(i)、y3(i) And y4(i) Effective values of the real part, and are respectively denoted as RMS1、RMS2、RMS3、RMS4The calculation formula of the effective value is as follows:
re in the formula2(yk(i) ) represents the finding of y1(i) The square of the real part, wherein N is the number of sampling points, and k is the serial numbers 1, 2, 3 and 4 of the inverse transformation and effective values of the four groups of FFT;
by means of a calibration system of a detection method facing to the leakage of the vacuum hot-press molding composite armor material, the effective values of the cross-correlation of standard leakage holes with the standard hole diameters of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1.0mm are obtained and recorded as: CRMSmM is an integer of 0 to 10, CRMSmUsing RMS in S3.5kSolving a calculation formula;
the effective value of the cross-correlation of the leakage aperture signals to be measured is recorded as XRMSkK is an integer from 1 to 4, XRMSkUsing RMS in S3.5kSolving a calculation formula;
s3.6, solving the Euclidean distance for the cross-correlation effective value of the leakage aperture signal to be detected and the cross-correlation effective value of the standard leakage aperture signal:
to this end, 11 sets of Euclidean distances, D, were obtained0To D10；
S3.7, taking D0To D10Minimum value of DminAnd storing a subscript p of the Euclidean distance at the moment; such as D1At minimum, p is 1; such as D2At minimum, p is 2; by analogy, p is an integer of 0-10;
s3.8, if p is greater than 0, judging that leakage exists, and turning to S3.9, wherein the leakage hole diameter d is 0.1 × p; otherwise, no leakage exists, finishing qualitative description of whether leakage exists, and turning to S3.11;
s3.9, moving the ultrasonic probe leftwards firstly, if D isminIncreasing the size, turning to S3.10, otherwise, continuing to move the ultrasonic probe leftwards until DminEnlarging, finishing qualitative description of existence of leakage, leakage aperture description and leakage hole positioning description, and turning to S3.11;
s3.10, move the ultrasonic probe to the right, if DminIncreasing the size, turning to S3.11, otherwise, continuing to move the ultrasonic probe to the right until DminEnlarging, finishing qualitative description of existence of leakage, leakage aperture description and leakage hole positioning description, and turning to S3.11;
and S3.11, continuously moving the ultrasonic probe forwards, moving and judging at the same time until the detection of the leakage of the whole vacuum hot press molding composite armor material is completed.
3. A vacuum hot press formed composite armor material leak-proof test apparatus, wherein the test method of claim 1 is applied, comprising: the system comprises a vacuum pump, a detection host and an internal pressure terminal, wherein the detection host is in wireless communication with the internal pressure terminal; the vacuum pump enables the composite armor material to generate negative pressure difference, the internal pressure terminal measures and processes the negative pressure difference data of the composite armor material, the detection host machine collects and processes ultrasonic signals, and the detection host machine calculates and completes qualitative description of whether leakage exists, leakage aperture description and leakage hole positioning description according to the ultrasonic signals.
4. The vacuum hot press molding-oriented composite armor material leakage detection device according to claim 3, wherein the detection host comprises: the ultrasonic probe, the receiving and conditioning module, the acquisition module, the FPGA and the computer system are sequentially connected, and the computer system is respectively connected with the first wireless module and the outer pressure measuring module.
5. The vacuum hot press molding composite armor material leakage-oriented detection device according to claim 4, wherein the computer system is provided with visualization software, bidirectional communication with the FPGA is realized by utilizing the communication interface, control and parameter setting of the FPGA are realized, and state, information and ultrasonic data are acquired from the FPGA; the computer system realizes bidirectional communication with the first wireless module by using the communication interface, and realizes control of the internal pressure terminal and acquisition of internal pressure data; the computer system realizes bidirectional communication with the external pressure measuring module by using the communication interface, and realizes the acquisition of external pressure data and the setting and control of parameters of the external pressure measuring module; and the computer system performs data processing according to a signal cross-correlation algorithm to obtain qualitative description of the existence of the leakage of the vacuum hot-press molding composite armor material, leakage aperture description and leakage hole positioning description, and realizes the functions of storage, display, inquiry and playback.
6. The vacuum hot press molding-oriented composite armor material leakage detection device according to claim 5, wherein the ultrasonic probe adopts a piezoelectric ultrasonic transducer with a center frequency of 40kHz to realize signal reception of ultrasonic waves generated by negative pressure difference induced flow;
the receiving and conditioning module realizes hardware circuit processing of ultrasonic signals received by the ultrasonic probe, and comprises: impedance matching, first-stage amplification, notch, second-stage amplification, band-pass filtering and final-stage amplification;
the acquisition module is used for realizing AD acquisition of the final-stage amplification signal of the receiving conditioning module;
the FPGA is used for realizing the control of the acquisition module and realizing the two-way communication with the computer system through the communication interface;
the first wireless module is connected with a computer system through a communication interface, and establishes a communication bridge for detecting the host and the internal pressure terminal;
the external pressure measuring module is connected with the computer system through a communication interface, the external pressure measuring module sends the acquired external pressure to the computer system through the communication interface, and the computer system realizes control, setting and state acquisition of the external pressure measuring module 17 through the communication interface.
7. The vacuum hot briquetting composite armor material leakage oriented detection apparatus of claim 3, wherein the internal pressure terminal includes: the system comprises an internal pressure measuring module, a second wireless module and a microprocessor, wherein the microprocessor is connected with the internal pressure measuring module and the second wireless module respectively.
8. The vacuum hot press molding-oriented composite armor material leakage detection device according to claim 7, wherein the microprocessor utilizes the communication interface to realize bidirectional communication with the second wireless module, so as to realize control of the internal pressure terminal; the microprocessor realizes bidirectional communication with the internal pressure measuring module by using the communication interface, and realizes internal pressure data acquisition and parameter setting and control of the internal pressure measuring module.
9. The vacuum hot press molding-oriented composite armor material leakage detection device according to claim 8, wherein the internal pressure measurement module is connected with the microprocessor through a communication interface, the internal pressure measurement module sends the obtained internal pressure to the microprocessor through the communication interface, and the microprocessor realizes control, setting and state obtaining of the internal pressure measurement module through the communication interface;
the second wireless module is connected with the microprocessor through the communication interface, the second wireless module establishes a communication bridge between the detection host and the internal pressure terminal, and the detection host realizes control, setting, state acquisition and internal pressure acquisition of the internal pressure terminal through the second wireless module.
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