CN212586309U - Tunnel lining detecting system based on audio frequency analysis - Google Patents
Tunnel lining detecting system based on audio frequency analysis Download PDFInfo
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- CN212586309U CN212586309U CN202020775564.3U CN202020775564U CN212586309U CN 212586309 U CN212586309 U CN 212586309U CN 202020775564 U CN202020775564 U CN 202020775564U CN 212586309 U CN212586309 U CN 212586309U
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Abstract
The utility model discloses a tunnel lining detection system based on audio frequency analysis, which comprises a processor, an excitation hammer, a filter and a microphone; the filter comprises a decoupling capacitor module, a filtering module and a positive and negative power supply conversion module; the microphone is connected with the input end of the filtering module, the output end of the filtering module is connected with the processor, and the processor is connected with the exciting hammer, so that the detection of the tunnel lining quality is realized, and the detection accuracy is improved.
Description
Technical Field
The utility model relates to a road engineering quality testing technical field, concretely relates to tunnel lining detecting system based on audio analysis.
Background
In the building engineering, the use of concrete is indispensable, and especially current building, most all structural beam, post, mound, stake etc. all need use. Therefore, the quality of the concrete directly affects the durability and safety of the building structure, and particularly for tunnel engineering, the quality of the concrete restricts the economic and social benefits of the tunnel engineering. When the construction process is not standard, the working procedures are not strict or the management is not proper, the safety problems of insufficient tunnel lining thickness, non-compact lining in surrounding rock contact, cavities, deformation and crack of the lining, water leakage, even block falling and the like can be caused. The falling blocks and falling of the lining have great safety hazard to high-speed trains, so that the tunnel lining defect detection is very necessary.
The existing method for detecting the surface defects of the tunnel lining is a geological radar method matched with a tapping method, namely, the tunnel lining detection is regulated to use the geological radar method matched with the tapping method in the railway tunnel engineering construction quality acceptance standard TB10417-2018 implemented in 2019, 2, 1 and 2 months. The tapping method mainly focuses on the frequency characteristics (tone) of the detection signal, and judges the defect of the lining by means of the ear hearing of a human, specifically: in the detection process of the knocking method, a detection person uses a vibration exciting hammer to knock a tunnel lining while moving on a detection frame 1 kilometer per hour, the knocking sound is clear and crisp, sounds of 'clang, clang and clang' are given out to indicate that lining concrete is dense, and if the knocking sound is dull, the sounds of 'clang, clang and clang' indicate that a cavity exists in the lining concrete. However, the detection depth of the method is limited and generally cannot exceed 10 cm; in addition, the detection process mainly depends on subjective judgment of detection personnel, when the detection time is too long, the detection personnel are fatigued, the hearing sensitivity of the detection personnel is reduced, the detection error of the tunnel lining quality is increased, and the detection result is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the testing process mainly relies on the subjective judgement of measurement personnel, and the testing result is inaccurate, provides a tunnel lining detecting system based on audio analysis, improves the accuracy to tunnel lining quality testing result.
The utility model discloses a following technical scheme realizes:
a tunnel lining detection system based on audio analysis comprises a processor, an excitation hammer, a filter and a microphone; the filter comprises a decoupling capacitor module, a filtering module and a positive and negative power supply conversion module; the microphone is connected with the input end of the filtering module, the output end of the filtering module is connected with the processor, and the processor is connected with the exciting hammer.
Further, the filtering module comprises a first filtering unit, a second filtering unit, a third filtering unit and a fourth filtering unit;
the first filtering unit, the second filtering unit, the third filtering unit and the fourth filtering unit are sequentially connected, the first filtering unit is connected with the input end of the filtering module, and the fourth filtering unit is connected with the output end of the filtering module.
Further, the first filtering unit includes a first operational amplifier, a first capacitor, a second capacitor, a thirteenth capacitor, a first resistor, a second resistor, a third resistor, a sixteenth resistor, a power supply voltage, and a negative voltage;
one end of the first capacitor is connected with the input end of the filter module, the other end of the first capacitor is respectively connected with one end of the second capacitor and one end of the first resistor, the other end of the first resistor is connected with the output end of the first operational amplifier, the other end of the second capacitor is respectively connected with the non-inverting input end of the first operational amplifier and one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is grounded, an inverting input terminal of the first operational amplifier is respectively connected with one end of the sixteenth resistor and one end of the thirteenth capacitor, the other end of the sixteenth resistor and the other end of the thirteenth capacitor are respectively connected to the output end of the first operational amplifier, and the output end of the first operational amplifier is also connected with a power supply voltage and a negative voltage.
Further, the second filtering unit includes a second operational amplifier, a third capacitor, a fourth capacitor, a fourteenth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventeenth resistor;
one end of the third capacitor is connected with the output end of the first operational amplifier, the other end of the third capacitor is connected with one end of the fourth capacitor and one end of the fourth resistor respectively, the other end of the fourth resistor is connected with the output end of the second operational amplifier, the other end of the fourth capacitor is connected with the non-inverting input end of the second operational amplifier and one end of the fifth resistor respectively, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is grounded, the inverting input end of the second operational amplifier is connected with one end of the seventeenth resistor and one end of the fourteenth capacitor respectively, and the other end of the seventeenth resistor and the other end of the fourteenth capacitor are connected to the output end of the second operational amplifier respectively.
Further, the third filtering unit includes a third operational amplifier, a fifth capacitor, a sixth capacitor, a fifteenth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eighteenth resistor, a power supply voltage, and a negative voltage;
one end of the fifth capacitor is connected to the output end of the second operational amplifier, the other end of the fifth capacitor is connected to one end of the sixth capacitor and one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the output end of the third operational amplifier, the other end of the sixth capacitor is connected to the non-inverting input end of the third operational amplifier and one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the tenth resistor, the other end of the tenth resistor is grounded, the inverting input end of the third operational amplifier is connected to one end of the eighteenth resistor and one end of the fifteenth capacitor, the other end of the eighteenth resistor and the other end of the fifteenth capacitor are connected to the output end of the third operational amplifier, and the output end of the third operational amplifier is also connected with a power supply voltage and a negative voltage.
Further, the fourth filtering unit includes a fourth operational amplifier, a seventh capacitor, an eighth capacitor, a sixteenth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a nineteenth resistor;
one end of the seventh capacitor is connected to the output end of the third operational amplifier, the other end of the seventh capacitor is connected to one end of the eighth capacitor and one end of the eleventh resistor, the other end of the eleventh resistor is connected to one end of the twelfth resistor, the other end of the twelfth resistor is connected to the output end of the fourth operational amplifier, the other end of the eighth capacitor is connected to the non-inverting input end of the fourth operational amplifier and one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is grounded, and the inverting input end of the fourth operational amplifier is connected to one end of the nineteenth resistor and one end of the sixteenth capacitor, the other end of the nineteenth resistor and the other end of the sixteenth capacitor are connected to the output end of the fourth operational amplifier respectively, and the output end of the fourth operational amplifier is connected with the output end of the filtering module.
Further, the positive and negative power conversion module comprises a power conversion chip, a diode, a seventeenth energy storage capacitor and an eighteenth energy storage capacitor;
an anode pin of an energy storage capacitor on the power conversion chip is connected with an anode of the seventeenth energy storage capacitor, and a cathode pin of the energy storage capacitor on the power conversion chip is connected with a cathode of the seventeenth energy storage capacitor; an output pin on the power conversion chip is connected with the cathode of the diode, the anode of the diode is respectively connected with the negative voltage and the cathode of the eighteenth energy storage capacitor, and the anode of the eighteenth energy storage capacitor is grounded; and a power pin of the power conversion chip is connected with the power voltage, and a grounding pin of the power conversion chip is grounded.
Further, the decoupling capacitor module comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor; the ninth capacitor is connected with the tenth capacitor in parallel, one end of the tenth capacitor is connected with a power supply voltage, and the other end of the tenth capacitor is grounded; and one end of the twelfth capacitor is connected with the negative voltage, and the other end of the twelfth capacitor is grounded.
Further, the tunnel lining detection system also comprises an earphone; the earphone is connected with the processor.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model relates to a tunnel lining detecting system based on audio analysis gathers the audio signal that the exciting vibration hammer sent and sends for the wave filter through the microphone, and the wave filter filters the audio signal who acquires, and the filtering site noise improves the judged result of follow-up treater. After the noise is filtered, the filter sends the audio signal of the filtered noise to the processor, and the processor judges the audio signal and outputs a detection result, so that the accuracy of detecting the quality of the tunnel lining is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a tunnel lining detection system based on audio analysis according to the present invention.
Fig. 2 is a schematic circuit diagram of the middle filter of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Examples
As shown in fig. 1-2, the present invention relates to a tunnel lining detection system based on audio frequency analysis, which comprises a processor, an excitation hammer, a filter and a microphone; the filter comprises a decoupling capacitor module, a filtering module and a positive and negative power supply conversion module; the microphone is connected with an input end P1 of the filtering module, an output end P2 of the filtering module is connected with the processor, and the processor is connected with the exciting hammer.
Further, the filtering module includes a first filtering unit, a second filtering unit, a third filtering unit and a fourth filtering unit.
The first filtering unit, the second filtering unit, the third filtering unit and the fourth filtering unit are sequentially connected, the first filtering unit is connected with the input end of the filtering module, and the fourth filtering unit is connected with the output end of the filtering module.
Specifically, an acceleration sensor is arranged on the vibration exciter, and when the vibration exciter strikes a tunnel, the acceleration sensor on the vibration exciter generates an acceleration signal and sends the acceleration signal to the processor. And after receiving the acceleration signal, the processor controls the microphone to be started, and collects the audio signal when the vibration hammer strikes the tunnel, so that the microphone is prevented from collecting invalid audio signals. The audio signal effective in this embodiment refers to the sound signal of the shock hammer hitting the tunnel.
The microphone sends the collected audio signals to the filter, the filter filters the audio signals to filter noise, the audio signals with the noise filtered are sent to the processor, and the processor processes the audio signals with the noise filtered according to a preset processing method to obtain a detection result.
The processing method in the processor specifically comprises the following steps: firstly, a microphone collects an audio signal and sends the audio signal to a filter; (II) the filter carries out noise filtering processing on the filtered audio signal and sends the processed audio signal to the processor; and (III) the processor calculates, analyzes and processes the audio signal after the noise filtering processing to obtain an analysis result, compares the analysis result with a first preset judgment threshold and a second preset judgment threshold to obtain a detection result, converts the detection result into detection voice and sends the detection voice to the earphone.
Specifically, the processor performs spectral analysis on the audio signal after obtaining the noise-filtered audio signal to obtain n audio characteristic values
Wherein x isikRefers to the kth audio characteristic value of the ith audio signal,
means the average, σ, of the audio characteristic values corresponding to the ith audio signalikDenotes the deviation, C, of the k-th audio characteristic value of the i-th audio signalkReference value, s, for an audio characteristic valueikDenotes the kth calculated value, s, of the ith audio signaliRefers to the detected value of the ith audio signal. After the detection value is obtained, comparing the detection value with a first preset judgment threshold value and a second preset judgment threshold value, and when the detection value is smaller than the first preset judgment threshold value, judging that the detection result is sound; when the detection value is greater than or equal to a first preset judgment threshold value and smaller than a second preset judgment threshold value, the detection result is a suspected defect; and when the detection value is larger than a second preset judgment threshold value, the detection result is a defect. After the detection result is obtained, the detection result is converted into corresponding voice through a text-to-voice technology and is sent to the earphone for broadcasting, so that a user can know the detection result. The text-To-speech technology in this embodiment includes, but is not limited To, TTS (text To speech).
The first preset judgment threshold and the second preset judgment threshold respectively refer to preset thresholds for judging whether the detection result meets the requirement. The first preset determination threshold in this embodiment is 1. The second preset judgment threshold value passes T 11+ a eta, wherein eta is a correction coefficient,
a is a constant, typically 0.682.
Further, the first filtering unit includes a first operational amplifier U1, a first capacitor C1, a second capacitor C2, a thirteenth capacitor C13, a first resistor R1, a second resistor R2, a third resistor R3, a sixteenth resistor R16, a power supply voltage, and a negative voltage.
One end of a first capacitor C1 is connected to an input end of the filter module, the other end of the first capacitor C1 is connected to one end of a second capacitor C2 and one end of a first resistor R1, the other end of the first resistor R1 is connected to an output end of a first operational amplifier U1, the other end of a second capacitor C2 is connected to a non-inverting input end of the first operational amplifier U1 and one end of a second resistor R2, the other end of the second resistor R2 is connected to one end of a third resistor R3, the other end of the third resistor R3 is grounded, an inverting input end of the first operational amplifier U1 is connected to one end of a sixteenth resistor R16 and one end of a thirteenth capacitor C13, the other end of the sixteenth resistor R16 and the other end of the thirteenth capacitor C13 are connected to an output end of the first operational amplifier U1, and an output end of the first operational amplifier U1 is further connected to a power supply voltage and a negative voltage.
Further, the second filtering unit includes a second operational amplifier U2, a third capacitor C3, a fourth capacitor C4, a fourteenth capacitor C14, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventeenth resistor R17.
One end of a third capacitor C3 is connected to the output end of the first operational amplifier U1, the other end of the third capacitor C3 is connected to one end of a fourth capacitor C4 and one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected to the output end of the second operational amplifier U2, the other end of the fourth capacitor C4 is connected to the non-inverting input end of the second operational amplifier U2 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of a sixth resistor R6, the other end of the sixth resistor R6 is grounded, the inverting input end of the second operational amplifier U2 is connected to one end of a seventeenth resistor R17 and one end of a fourteenth capacitor C14, and the other end of the seventeenth resistor R17 and the other end of the fourteenth capacitor C14 are connected to the output end of the second operational amplifier U2.
Further, the third filtering unit includes a third operational amplifier U3, a fifth capacitor C5, a sixth capacitor C6, a fifteenth capacitor C15, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighteenth resistor R18, a power supply voltage, and a negative voltage.
One end of a fifth capacitor C5 is connected to the output end of the second operational amplifier U2, the other end of the fifth capacitor C5 is connected to one end of a sixth capacitor C6 and one end of a seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected to the output end of the third operational amplifier U3, the other end of a sixth capacitor C6 is connected to the non-inverting input end of the third operational amplifier U3 and one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is grounded, the inverting input end of the third operational amplifier U3 is connected to one end of an eighteenth resistor R18 and one end of a fifteenth capacitor C15, the other end of an eighteenth resistor R18 and the other end of a fifteenth capacitor C15 are connected to the output end of the third operational amplifier U3, and the output end of the third operational amplifier U3 is connected to a negative voltage and a power supply voltage.
Further, the fourth filtering unit includes a fourth operational amplifier U4, a seventh capacitor C7, an eighth capacitor C8, a sixteenth capacitor C16, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a nineteenth resistor R19.
One end of a seventh capacitor C7 is connected to the output terminal of the third operational amplifier U3, the other end of the seventh capacitor C7 is connected to one end of an eighth capacitor C8 and one end of an eleventh resistor R11, respectively, the other end of an eleventh resistor R11 is connected to one end of a twelfth resistor R12, the other end of a twelfth resistor R12 is connected to the output terminal of the fourth operational amplifier U4, the other end of an eighth capacitor C8 is connected to the non-inverting input terminal of the fourth operational amplifier U4 and one end of a thirteenth resistor R13, the other end of a thirteenth resistor R13 is connected to one end of a fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to one end of a fifteenth resistor R15, the other end of a fifteenth resistor R15 is grounded, the inverting input terminal of the fourth operational amplifier U4 is connected to one end of a nineteenth resistor R19 and one end of a sixteenth capacitor C16, the other end of a nineteenth resistor R19 and the other end of a sixteenth capacitor C16 are connected to the output terminal of a fourth operational amplifier U4, the output terminal of the fourth operational amplifier U4 is connected to the output terminal of the filtering module.
Further, the positive and negative power conversion module comprises a power conversion chip, a diode D1, a seventeenth energy storage capacitor C17 and an eighteenth energy storage capacitor C18.
An anode pin of an energy storage capacitor on the power conversion chip is connected with the anode of a seventeenth energy storage capacitor C17, and a cathode pin of the energy storage capacitor on the power conversion chip is connected with the cathode of a seventeenth energy storage capacitor C17; an output pin on the power conversion chip is connected with the cathode of a diode D1, the anode of a diode D1 is respectively connected with the negative voltage and the cathode of an eighteenth energy storage capacitor C18, and the anode of the eighteenth energy storage capacitor C18 is grounded; the power pin of the power conversion chip is connected with power voltage, and the grounding pin of the power conversion chip is grounded.
Further, the decoupling capacitor module includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; the ninth capacitor C9 and the tenth capacitor C10 are connected in parallel, one end of the tenth capacitor C10 is connected with the power supply voltage, and the other end of the tenth capacitor C10 is grounded; the eleventh capacitor C11 and the twelfth capacitor C12 are connected in parallel, one end of the twelfth capacitor C12 is connected with a negative voltage, and the other end is grounded.
The power supply voltage is connected to the circuit through a power supply voltage terminal P3.
Specifically, the user can set the sizes of each capacitor and each resistor in the filtering module according to actual conditions.
Further, the tunnel lining detection system also comprises earphones; the earphone is connected with the processor.
Specifically, after the processor obtains the detection result, the detection result is sent to the earphone, and the earphone selects a corresponding prompt tone according to the detection result and plays the prompt tone to the user for determining the detection result according to the prompt tone sent by the earphone.
Furthermore, the processor, the vibration hammer, the filter, the microphone and the earphone can be connected through wires, so that data loss or errors caused by network instability can be avoided; also can adopt wireless connection, reduce the testing result error that leads to because of the cable trouble, effectively reduce on-the-spot cable complexity simultaneously, make whole detecting system simpler, specifically select for use wired connection or wireless connection can confirm according to actual need.
The utility model relates to a tunnel lining detecting system based on audio analysis, gather the exciting hammer through the microphone and strike the audio signal that tunnel lining sent and send for the wave filter, first filtering unit, second filtering unit, third filtering unit and fourth filtering unit in the wave filter the audio signal who acquires in proper order, and the noise in the field of filtering improves the judged result of follow-up treater. After the noise is filtered, the filter sends the audio signal of the filtered noise to the processor, and the processor judges the audio signal and outputs a detection result, so that the accuracy of detecting the quality of the tunnel lining is improved.
In particular, the above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only a detailed description of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A tunnel lining detection system based on audio analysis is characterized by comprising a processor, a vibration exciter, a filter and a microphone; the filter comprises a decoupling capacitor module, a filtering module and a positive and negative power supply conversion module; the microphone is connected with the input end of the filtering module, the output end of the filtering module is connected with the processor, and the processor is connected with the exciting hammer.
2. The system of claim 1, wherein the filtering module comprises a first filtering unit, a second filtering unit, a third filtering unit, and a fourth filtering unit;
the first filtering unit, the second filtering unit, the third filtering unit and the fourth filtering unit are sequentially connected, the first filtering unit is connected with the input end of the filtering module, and the fourth filtering unit is connected with the output end of the filtering module.
3. The acoustic analysis-based tunnel lining detection system of claim 2, wherein the first filtering unit comprises a first operational amplifier, a first capacitor, a second capacitor, a thirteenth capacitor, a first resistor, a second resistor, a third resistor, a sixteenth resistor, a supply voltage and a negative voltage;
one end of the first capacitor is connected with the input end of the filter module, the other end of the first capacitor is respectively connected with one end of the second capacitor and one end of the first resistor, the other end of the first resistor is connected with the output end of the first operational amplifier, the other end of the second capacitor is respectively connected with the non-inverting input end of the first operational amplifier and one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is grounded, an inverting input terminal of the first operational amplifier is respectively connected with one end of the sixteenth resistor and one end of the thirteenth capacitor, the other end of the sixteenth resistor and the other end of the thirteenth capacitor are respectively connected to the output end of the first operational amplifier, and the output end of the first operational amplifier is also connected with a power supply voltage and a negative voltage.
4. The acoustic-frequency-analysis-based tunnel lining detection system as claimed in claim 3, wherein the second filtering unit comprises a second operational amplifier, a third capacitor, a fourth capacitor, a fourteenth capacitor, a fourth resistor, a fifth resistor, a sixth resistor and a seventeenth resistor;
one end of the third capacitor is connected with the output end of the first operational amplifier, the other end of the third capacitor is connected with one end of the fourth capacitor and one end of the fourth resistor respectively, the other end of the fourth resistor is connected with the output end of the second operational amplifier, the other end of the fourth capacitor is connected with the non-inverting input end of the second operational amplifier and one end of the fifth resistor respectively, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is grounded, the inverting input end of the second operational amplifier is connected with one end of the seventeenth resistor and one end of the fourteenth capacitor respectively, and the other end of the seventeenth resistor and the other end of the fourteenth capacitor are connected to the output end of the second operational amplifier respectively.
5. The acoustic-frequency-analysis-based tunnel lining detection system as claimed in claim 4, wherein the third filtering unit comprises a third operational amplifier, a fifth capacitor, a sixth capacitor, a fifteenth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eighteenth resistor, a power supply voltage and a negative voltage;
one end of the fifth capacitor is connected to the output end of the second operational amplifier, the other end of the fifth capacitor is connected to one end of the sixth capacitor and one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the output end of the third operational amplifier, the other end of the sixth capacitor is connected to the non-inverting input end of the third operational amplifier and one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the tenth resistor, the other end of the tenth resistor is grounded, the inverting input end of the third operational amplifier is connected to one end of the eighteenth resistor and one end of the fifteenth capacitor, the other end of the eighteenth resistor and the other end of the fifteenth capacitor are connected to the output end of the third operational amplifier, and the output end of the third operational amplifier is also connected with a power supply voltage and a negative voltage.
6. The acoustic-frequency-analysis-based tunnel lining detection system according to claim 5, wherein the fourth filtering unit comprises a fourth operational amplifier, a seventh capacitor, an eighth capacitor, a sixteenth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a nineteenth resistor;
one end of the seventh capacitor is connected to the output end of the third operational amplifier, the other end of the seventh capacitor is connected to one end of the eighth capacitor and one end of the eleventh resistor, the other end of the eleventh resistor is connected to one end of the twelfth resistor, the other end of the twelfth resistor is connected to the output end of the fourth operational amplifier, the other end of the eighth capacitor is connected to the non-inverting input end of the fourth operational amplifier and one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is grounded, and the inverting input end of the fourth operational amplifier is connected to one end of the nineteenth resistor and one end of the sixteenth capacitor, the other end of the nineteenth resistor and the other end of the sixteenth capacitor are connected to the output end of the fourth operational amplifier respectively, and the output end of the fourth operational amplifier is connected with the output end of the filtering module.
7. The system of claim 3 or 5, wherein the positive and negative power conversion modules comprise power conversion chips, diodes, a seventeenth energy storage capacitor and an eighteenth energy storage capacitor;
an anode pin of an energy storage capacitor on the power conversion chip is connected with an anode of the seventeenth energy storage capacitor, and a cathode pin of the energy storage capacitor on the power conversion chip is connected with a cathode of the seventeenth energy storage capacitor; an output pin on the power conversion chip is connected with the cathode of the diode, the anode of the diode is respectively connected with the negative voltage and the cathode of the eighteenth energy storage capacitor, and the anode of the eighteenth energy storage capacitor is grounded; and a power pin of the power conversion chip is connected with the power voltage, and a grounding pin of the power conversion chip is grounded.
8. The acoustic analysis-based tunnel lining detection system of claim 1, wherein the decoupling capacitor module comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor; the ninth capacitor is connected with the tenth capacitor in parallel, one end of the tenth capacitor is connected with a power supply voltage, and the other end of the tenth capacitor is grounded; and one end of the twelfth capacitor is connected with the negative voltage, and the other end of the twelfth capacitor is grounded.
9. The acoustic analysis-based tunnel lining detection system of claim 1, wherein the tunnel lining detection system further comprises an earphone; the earphone is connected with the processor.
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| CN202020775564.3U CN212586309U (en) | 2020-05-11 | 2020-05-11 | Tunnel lining detecting system based on audio frequency analysis |
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| CN202020775564.3U CN212586309U (en) | 2020-05-11 | 2020-05-11 | Tunnel lining detecting system based on audio frequency analysis |
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