CN214310307U - Guided wave phased array monitored control system - Google Patents
Guided wave phased array monitored control system Download PDFInfo
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- CN214310307U CN214310307U CN202023063368.2U CN202023063368U CN214310307U CN 214310307 U CN214310307 U CN 214310307U CN 202023063368 U CN202023063368 U CN 202023063368U CN 214310307 U CN214310307 U CN 214310307U
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Abstract
The utility model discloses a guided wave phased array monitored control system, this system are for integrating the chip system, including host computer, supersound guided wave transmitter, supersound guided wave receiver, matrix switch array and sensor network, integrate above-mentioned part for a miniature circuit that integrates, finally synthesize the framework of a chip. The excitation signal output end of the upper computer is connected with the input end of the ultrasonic guided wave transmitter, the upper computer is in signal interconnection with the ultrasonic guided wave receiver, and the ultrasonic guided wave transmitter and the ultrasonic guided wave receiver are connected with the sensor network through the matrix switch array. The utility model discloses design guided wave phased array system for integrating the chip system, simple structure, it is small, be convenient for arrange on the structure that awaits measuring, can realize the online nondestructive monitoring to the structure, can provide damage position and damage scope for structure maintenance personal directly perceivedly simultaneously, also provide damage development prediction basis for structure state monitoring personnel.
Description
Technical Field
The utility model relates to a guided wave phased array monitored control system belongs to supersound phased array and detects technical field.
Background
In the operation process of aerospace craft, high-speed train and the like, the structure of the aerospace craft, the high-speed train and the like is easily damaged, such as cracks, delaminations and the like, due to the influence of loads, impacts and sudden accidents, and catastrophic results can be caused in severe cases. To avoid the resulting loss of personnel and property, the critical structures must be periodically maintained and inspected. Due to the restriction of factors such as space, efficiency, running time, equipment volume and the like, the conventional nondestructive testing technology is difficult to realize the online monitoring of the structure. In the existing structural health monitoring technology, Lamb wave damage monitoring technology is considered as one of the technologies with the most application prospect due to the characteristics of the guided wave characteristic and sensitivity to small damage.
However, due to different implementation requirements, the existing ultrasonic phased array technology cannot be directly applied to structure on-line monitoring, and mainly lies in that the on-line guided wave monitoring has high requirements on signal driving, and when a multichannel synchronous signal is excited, the system cost is high, the volume power consumption and the like are difficult to meet the use requirements of on-line monitoring.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a small-size simple and convenient guided wave phased array monitored control system, can realize the online nondestructive monitoring to the structure, can provide damage position and damage scope for structure maintenance personnel directly perceivedly simultaneously, also provide damage development prediction foundation for structure state monitoring personnel.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a guided wave phased array monitored control system, this system is for integrating the chip system, includes host computer, supersound guided wave transmitter, supersound guided wave receiver, matrix switch array and sensor network, integrates the framework of a miniature integrated circuit, the final synthetic chip of above-mentioned parts. The excitation signal output end of the upper computer is connected with the input end of the ultrasonic guided wave transmitter, the upper computer is in signal interconnection with the ultrasonic guided wave receiver, and the ultrasonic guided wave transmitter and the ultrasonic guided wave receiver are connected with the sensor network through the matrix switch array.
The ultrasonic guided wave transmitter comprises a wave function generator and a power amplifier, wherein the wave function generator is used as an input end to be connected with an upper computer, the power amplifier is used as an output end to be connected with a matrix switch array, and the output end of the wave function generator is connected with the input end of the power amplifier.
The ultrasonic guided wave receiver comprises a preamplifier and a digital oscilloscope, wherein the preamplifier is used as an input end and connected with a switch array, an output end of the preamplifier is respectively connected with the digital oscilloscope and an upper computer, and the digital oscilloscope and the upper computer are interconnected.
Further, the matrix switch array is controllable analog switch array, and ultrasonic sensor in every cluster switch connection sensor network, when a switch transmitting signal, other switches are responsible for receiving, circulate in proper order, realize the receipt and the transmission of signal. The switches in the matrix switch array are single-pole multi-throw switches.
Further, the sensor network is the ultrasonic sensor of single-row range, ultrasonic sensor is formed by a plurality of piezoelectric wafer combinations. And each ultrasonic sensor in the sensor network is connected with the ultrasonic guided wave transmitter and the ultrasonic guided wave receiver through the matrix switch array.
When the system of the utility model is applied, all nodes in the sensor network (namely the connection points of the ultrasonic sensor and the matrix switch array) are connected with the excitation end (ultrasonic guided wave emitter) and the sensing end (ultrasonic guided wave receiver) of the system through the matrix switch array; the time for exciting each array element in the probe (namely, an ultrasonic sensor) is controlled through an analog switch, so that the phased emission of ultrasonic waves is achieved; phase control receiving is achieved through delay superposition of echo signals of all array elements; therefore, the deflection of the ultrasonic beam is realized, and the range scanning and the focusing imaging of the detection area of the detected object can be completed.
The arrangement rule on the structural part to be tested is as follows: and arranging a group of piezoelectric sensing arrays, sequentially controlling the excitation piezoelectric sheets to generate excitation signals, and correspondingly responding the receiving piezoelectric sheets to receive response signals until the acquisition of response signals of all monitoring units is completed.
Compared with the prior art, the utility model discloses the beneficial effect who reaches:
the utility model discloses a guided wave phased array system design is for integrating the chip system, simple structure, and is small, with several little modules of systematic division, is connected each other to minimum module and spare part satisfy various actual demands sooner. The system is convenient to arrange on a structural part to be detected, can realize on-line nondestructive monitoring on the structural part, can visually provide a damage position and a damage range for structural part maintenance personnel, and also provides a damage development prediction basis for structural part state monitoring personnel.
Drawings
Fig. 1 is a structural design diagram of an embodiment of the monitoring system of the present invention.
Fig. 2 is a schematic diagram of the topology of the middle matrix switch array and the sensing array according to the present invention.
Fig. 3 is an internal schematic diagram of a matrix switch array according to the present invention.
Fig. 4 is a schematic flow chart of the monitoring system in the ultrasonic testing according to the embodiment of the present invention.
Fig. 5 is a diagram of an excitation signal of a monitoring system in ultrasonic testing according to an embodiment of the present invention.
Fig. 6 is a waveform diagram of typical echo signals of each group of sensors according to an embodiment of the present invention.
Fig. 7 is a diagram of the defect detection result obtained by the ultrasonic testing according to the embodiment of the present invention.
Fig. 8 is a defect image obtained by processing the ultrasonic detection result by a threshold according to an embodiment of the present invention.
In the figure: the ultrasonic sensor comprises a 1-upper computer, a 2-ultrasonic guided wave transmitter, a 21-waveform function generator, a 22-power amplifier, a 3-ultrasonic guided wave receiver, a 31-preamplifier, a 32-digital oscilloscope, a 4-matrix switch array, a 41-single-pole multi-throw switch, a 5-sensor network and a 51-ultrasonic sensor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Examples
As shown in fig. 1, the guided wave phased array monitoring system is a chip integrated system, and includes an upper computer 1, an ultrasonic guided wave transmitter 2, an ultrasonic guided wave receiver 3, a matrix switch array 4 and a sensor network 5, which integrate the above components into a small integrated circuit, and finally synthesize a chip architecture. The excitation signal output end of the upper computer 1 is connected with the input end of the ultrasonic guided wave transmitter 2, the upper computer 1 is in signal interconnection with the ultrasonic guided wave receiver 3, and the ultrasonic guided wave transmitter 2 and the ultrasonic guided wave receiver 3 are connected with the sensor network 5 through the matrix switch array 4.
As shown in fig. 1, the ultrasonic guided wave transmitter 2 of the present embodiment includes a waveform function generator 21 and a power amplifier 22, the waveform function generator 21 is connected to the upper computer 1 as an input end, the power amplifier 23 is connected as an output end, and the output end of the waveform function generator 21 is connected to the input end of the power amplifier 23. The ultrasonic guided wave receiver 3 comprises a preamplifier 31 and a digital oscilloscope 32, wherein the preamplifier 31 is used as an input end and connected with the matrix switch array 4, the output end of the preamplifier is respectively connected with the digital oscilloscope 32 and the upper computer 1, and the digital oscilloscope 32 is connected with the upper computer 1. In the figure, solid arrows represent reception signal paths, and dashed arrows represent excitation signal paths.
The matrix switch array 4 in this embodiment is a controllable analog switch array, in which the switches are single-pole multi-throw switches 41, and each series of switches is connected to one ultrasonic sensor 51 in the sensor network 5 to implement signal receiving and transmitting. The sensor network 5 in this embodiment is a single row of ultrasonic sensors 51. The ultrasonic sensor 51 is formed by combining a plurality of piezoelectric wafers. Each ultrasonic sensor 51 in the sensor network 5 is connected with an ultrasonic guided wave transmitter 2 and an ultrasonic guided wave receiver 3 through a matrix switch array 4.
The topology of the matrix switch array 4 and the sensor network 5 is shown in fig. 2. During specific operation, the excitation end (ultrasonic guided wave emitter 2), the matrix switch array 4, the sensing end (ultrasonic guided wave receiver 3), the sensor network 5 and the like are connected in the above mode, and then the computer is operated to send out a control signal through the PC to control the single-pole multi-throw switch 41 to be switched continuously. Each series of single-pole multi-throw switches 41 is connected with one ultrasonic sensor 51, and when one switch transmits a signal, the other switches are responsible for receiving and circulating in sequence to realize the receiving and transmitting of the signal.
Fig. 3 is an internal schematic diagram of the matrix switch array of this embodiment, in which 16 switches operate independently and serial data is clocked on the L-to-H transition of CLK. All 16 switches enter a state that maintains their locked state on the rising edge of LE, shifting register data through the latch when LE is low and DOUT is high when data in shift register 15 is high. If LE is high, the shift register clock has no effect on the switch state. And connecting the switch matrix with a sensor probe network, and then controlling the free switching of the matrix switch through system intelligence. Therefore, the adjusting and switching time can be greatly reduced, the operation is convenient, and the reliability and the flexibility are high.
Fig. 4 is a schematic flow chart of the present invention in ultrasonic testing. By controlling the system, a desired direction of the wavefront is formed in the structure, and when the phased array wavefront encounters a defect, an echo signal is generated. By delaying the return signal and adopting the superposition principle, a prominent wave crest can be determined, and then the position of the defect can be determined by subsequent processing. In the experiment, defects simulate signal reflections caused by damage in the form of additional mass. FIG. 5 is an experimental excitation signal with a center frequency of 400 kHz. Fig. 6 is a waveform diagram of a typical echo signal of each group of ultrasonic sensors, in which the wavefront of the echo signal can be seen. After the damage scattering signals in all directions are correspondingly delayed, the signals in all directions are superposed to synthesize a total signal in the direction, normalization is carried out, namely the amplitude of each point is compared with the maximum amplitude of all the signals to obtain the relative amplitude of the point, then the signals in all directions are compared, and the direction in which the signal with the maximum normalized amplitude is located is the direction in which the damage is located. Finally, the defect detection result obtained by the calculation processing of delay superposition is shown in fig. 7, and the image shown in fig. 8 is obtained by the threshold processing.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (8)
1. The utility model provides a guided wave phased array monitored control system, this system of its characterized in that is the chip system that integrates, includes host computer (1), supersound guided wave transmitter (2), supersound guided wave receiver (3), matrix switch array (4) and sensor network (5), the input of supersound guided wave transmitter (2) is connected to the excitation signal output of host computer (1), and host computer (1) and supersound guided wave receiver (3) signal interconnection, supersound guided wave transmitter (2) and supersound guided wave receiver (3) all are connected with sensor network (5) through matrix switch array (4).
2. The guided wave phased array monitoring system according to claim 1, characterized in that the ultrasonic guided wave transmitter (2) comprises a wave function generator (21) and a power amplifier (22), the wave function generator (21) is connected as an input to the upper computer (1), the power amplifier (22) is connected as an output to the matrix switch array (4), and the output of the wave function generator (21) is connected to the input of the power amplifier (22).
3. The guided wave phased array monitoring system according to claim 1, wherein the ultrasonic guided wave receiver (3) comprises a preamplifier (31) and a digital oscilloscope (32), the preamplifier (31) is connected with the matrix switch array (4) as an input end, an output end of the preamplifier is respectively connected with the digital oscilloscope (32) and the upper computer (1), and the digital oscilloscope (32) and the upper computer (1) are interconnected.
4. The guided wave phased array monitoring system according to claim 1, characterized in that the matrix switch array (4) is a controllable analog switch array, each string of switches being connected to one sensor of a sensor network (5) for signal reception and transmission.
5. Guided wave phased array monitoring system according to claim 4, characterized in that the switches in the matrix switch array (4) are single pole multiple throw switches (41).
6. The guided wave phased array monitoring system of claim 1, characterized in that the sensor network (5) is a single row of arrayed ultrasonic sensors (51).
7. The guided wave phased array monitoring system as claimed in claim 6, wherein the ultrasonic sensor (51) is composed of a plurality of piezoelectric wafers.
8. The guided wave phased array monitoring system according to claim 6 or 7, characterized in that each ultrasonic sensor (51) in the sensor network (5) connects an ultrasonic guided wave transmitter (2) and an ultrasonic guided wave receiver (3) through a matrix switch array (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023063368.2U CN214310307U (en) | 2020-12-18 | 2020-12-18 | Guided wave phased array monitored control system |
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| CN202023063368.2U CN214310307U (en) | 2020-12-18 | 2020-12-18 | Guided wave phased array monitored control system |
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