CN112129402B - Abnormal sound source detection device - Google Patents
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Abstract
The invention discloses an abnormal sound source detection device, which comprises: a probe, a microprocessor and a probe movement indicator; the detection probe comprises a plurality of microphones and a bracket; the detection probe is used for acquiring a first sound pressure signal generated by a first detection position of an object to be detected through a plurality of microphones; the microprocessor is used for determining a first relative position relation between an abnormal sound source of the object to be detected and a first detection position according to the magnitude relation of the first sound pressure signal, and generating a first moving signal or a first detection completion signal according to the first relative position relation; the first moving signal is used for determining a first to-be-moved direction of the probe, and the first detection completion signal is used for determining completion of detection of an abnormal sound source of the object to be detected; the probe moving indicator is used for indicating a first direction to be moved according to the first moving signal or indicating that the detection of the abnormal sound source of the object to be detected is completed according to the first detection completion signal. The method and the device can achieve the purpose of efficiently and quickly finding the abnormal sound source.
Description
Technical Field
The invention relates to the technical field of mechanical detection, in particular to an abnormal sound source detection device.
Background
With the continuous progress of science and technology, people can not leave various efficient mechanical equipment, including production equipment in factories, automobiles and the like. In the process that mechanical equipment is just put into use, abnormal sound generally does not exist; when mechanical equipment operates for a period of time, some abnormal sounds can appear more or less, although the abnormal sounds of the mechanical equipment do not mean that the mechanical equipment cannot operate normally, the abnormal sounds can affect the environment and cause noise pollution, and meanwhile, the uneasiness in the mind of people can be increased, and the normal work and life are easily interfered.
The abnormal sound source detection device provided in the related technology is complex and is provided with a plurality of sensors, so that the hardware cost is high; the configured abnormal sound source detection algorithm is complex, so that the configured chip requirement is high, and the chip cost is high; the configured software system is complex to operate, and an operator needs to have a certain degree of acoustic theory knowledge and is difficult to master by common people. In summary, the abnormal sound source detecting device provided in the related art is high in cost and complex in operation, and is not suitable for general technicians.
Disclosure of Invention
The embodiment of the application provides an abnormal sound source detection device, has solved among the prior art abnormal sound source and has surveyed with high costs, the complicated technical problem of operation, has realized the purpose of high-efficient, simple detection abnormal sound source, has reduced the cost that abnormal sound source was surveyed simultaneously.
The application provides an abnormal sound source detection device, which comprises a detection probe, a microprocessor and a probe movement indicator;
the probing probe comprises a plurality of microphones and a support having a plurality of support arms; the A ends of the support arms are connected together, and the B ends of the support arms are respectively provided with a microphone; the microphones are positioned on the same plane;
the probe moving indicator and the microphones are respectively and electrically connected with the microprocessor; wherein the content of the first and second substances,
the detection probe is used for acquiring a first sound pressure signal generated by a first detection position of an object to be detected through a plurality of microphones;
the microprocessor is used for receiving the first sound pressure signal, determining a first relative position relation between an abnormal sound source of the object to be detected and a first detection position according to the magnitude relation of the first sound pressure signal, and generating a first moving signal or a first detection completion signal according to the first relative position relation; the first moving signal is used for determining a first to-be-moved direction of the probe, and the first detection completion signal is used for determining completion of detection of an abnormal sound source of the object to be detected;
the probe moving indicator is used for receiving the first moving signal or the first detection completion signal, and indicating the first direction to be moved according to the first moving signal, or indicating the completion of the detection of the abnormal sound source of the object to be detected according to the first detection completion signal.
Further, the microprocessor is specifically configured to:
determining whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is positioned in the preset radius of the first detection position, generating a first detection completion signal.
Further, the microprocessor is specifically configured to:
determining whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is not positioned in the preset radius of the first detection position, generating a first moving signal.
Further, a probe movement indicator, further for: acquiring a second sound pressure signal generated by a second detection position through the plurality of microphones after indicating the first direction to be moved according to the first movement signal, wherein the second detection position is different from the first detection position;
a microprocessor further configured to: receiving the second acoustic pressure signal, determining a second relative position relationship between the abnormal sound source of the object to be detected and a second detection position according to the magnitude relationship of the second acoustic pressure signal, and generating a second movement signal or a second detection completion signal according to the second relative position relationship; the second moving signal is used for determining a second to-be-moved direction of the probe, and the second detection completion signal is used for determining completion of detection of the abnormal sound source of the object to be detected;
a probe movement indicator, further to: and receiving a second moving signal or a second detection completion signal, and indicating a third to-be-moved direction of the detection probe according to the second moving signal or indicating completion of detection of the abnormal sound source of the object to be detected according to the second detection completion signal.
Further, when the number of the microphones is 4 and the number of the support arms is 4, any two adjacent support arms are perpendicular to each other;
a probing probe, further configured to: acquiring a first sound pressure signal generated by a first detection position through 4 microphones;
a microprocessor further configured to: sequencing the 4 collected first sound pressure signals in a descending order, and marking the 4 sequenced first sound pressure signals as V1, V2, V3 and V4 respectively; determining the difference between two adjacent first sound pressure signals, and respectively recording the difference as D1, D2 and D3; wherein D1-V1-V2, D2-V2-V3, and D3-V3-V4; comparing D1, D2 and D3 with an intra-cluster difference value D0 respectively; when D1< D0, D2< D0 and D3< D0, determining that the abnormal sound source of the object to be detected is located within a preset radius of the first detection position, and generating a first detection completion signal; when D1< D0, D2> D0, D3< D0, or D1> D0, D2< D0, D3> D0, determining that the abnormal sound source of the object to be detected is not located within the preset radius of the first detection position, and generating a first movement signal.
Further, the microprocessor is also configured to:
when D1< D0, D2> D0 and D3< D0, determining that an abnormal sound source of the object to be detected is positioned between included angles along the lines of the support arms where the two microphones corresponding to V1 and V2 are positioned; generating a first movement signal; the first movement signal is used for determining a first direction to be moved of the probe head, wherein the first direction to be moved is a direction between included angles along which the two microphone arms corresponding to the V1 and the V2 are located.
Further, the microprocessor is also configured to:
when D1> D0, D2< D0, D3> D0, determining that the abnormal sound source of the object to be detected is positioned on the line of the bracket arm where the microphone corresponding to V1 is positioned; generating a first movement signal; the first movement signal is used to determine a first direction to be moved of the probe head, wherein the first direction to be moved is along the arm of the microphone corresponding to V1.
Furthermore, each support arm is provided with a plurality of mounting holes, and the mounting holes are used for mounting microphones;
the distance between the mounting hole for mounting the microphone and the end A is determined according to the abnormal sound frequency of the abnormal sound source of the object to be measured.
Further, the apparatus further comprises:
the system comprises a band-pass system filter bank, a frequency weighting network and a data acquisition unit, wherein a plurality of microphones are electrically connected with the band-pass system filter bank; the band-pass system filter bank, the frequency weighting network, the data acquisition unit, the microprocessor and the probe moving indicator are electrically connected in sequence;
the band-pass system filter bank is used for filtering a first sound pressure signal acquired by the microphone; the frequency weighting network is used for weighting and calculating the filtered first sound pressure signal; the data acquisition unit is used for receiving the distance between the microphone and the A end;
a microprocessor further configured to: and determining a first relative position relation between the abnormal sound source of the object to be detected and the first detection position according to the distance between the microphone and the end A and the weighted first sound pressure signal.
Further, a probe movement indicator comprising:
a left indicator, a left front indicator, a right rear indicator, a left rear indicator, and a detection completion indicator.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. this application surveys the acquisition sound pressure signal through a plurality of microphones to the object that awaits measuring, and microprocessor judges the sound pressure signal of microphone to confirm the relative position relation of abnormal sound source for current detection position, the relative position of rethread probe movement indicator instruction abnormal sound source for current detection position finds the abnormal sound source fast, and then realizes high-efficient, the purpose of finding the abnormal sound source fast.
2. The sensor used in the application is only a microphone, and compared with the related technology, the application greatly reduces the hardware cost; by using the method and the device, the abnormal sound source can be detected only by understanding the indication of the probe moving indicator without related professional knowledge, and the operation is simple; the technical scheme that the surface of the object to be detected can be detected point by point only by using a complex detection instrument in the related technology is avoided, the position of the abnormal sound source can be determined only by detecting partial point positions of the object to be detected, the abnormal sound source detection time is saved, and the abnormal sound source detection efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an abnormal sound source detection apparatus provided in the present application;
FIG. 2 is a schematic view of a stent structure provided herein;
FIG. 3 is a schematic diagram of a probing probe provided herein;
fig. 4 is a schematic distribution diagram of an abnormal sound source and a microphone provided by the present application;
fig. 5 is a schematic structural diagram of a probe movement indicator provided in the present application.
Detailed Description
The embodiment of the application provides an abnormal sound source detection method, and solves the technical problems of high abnormal sound source detection cost and complex operation in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a kind of abnormal sound source detection device, the detection device includes detecting the probe, microprocessor and probe movement indicator; the probing probe comprises a plurality of microphones and a support having a plurality of support arms; the A ends of the support arms are connected together, and the B ends of the support arms are respectively provided with a microphone; the microphones are positioned on the same plane; the probe moving indicator and the microphones are respectively and electrically connected with the microprocessor; the detection probe is used for acquiring a first sound pressure signal generated by a first detection position of an object to be detected through a plurality of microphones; the microprocessor is used for receiving the first sound pressure signal, determining a first relative position relation between an abnormal sound source of the object to be detected and a first detection position according to the magnitude relation of the first sound pressure signal, and generating a first moving signal or a first detection completion signal according to the first relative position relation; the first moving signal is used for determining a first to-be-moved direction of the probe, and the first detection completion signal is used for determining completion of detection of an abnormal sound source of the object to be detected; the probe moving indicator is used for receiving the first moving signal or the first detection completion signal, and indicating the first direction to be moved according to the first moving signal, or indicating the completion of the detection of the abnormal sound source of the object to be detected according to the first detection completion signal.
This application adopts the sound pressure signal of probe to await measuring the object to gather, and rethread microprocessor judges the size of sound pressure signal, and then confirms the relative position relation of abnormal sound source and A end, and rethread detection removes the relative position relation of indicator instruction abnormal sound source and A end, has realized the detection to the abnormal sound source high-efficiently, fast, with low costs.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The application provides an abnormal sound source detection device as shown in fig. 1, which specifically comprises the following steps:
a kind of abnormal sound source detection device, the detection device includes detecting the probe, microprocessor and probe movement indicator;
the probing probe comprises a plurality of microphones and a support having a plurality of support arms; the A ends of the support arms are connected together, and the B ends of the support arms are respectively provided with a microphone; the microphones are positioned on the same plane;
the probe moving indicator and the microphones are respectively and electrically connected with the microprocessor; wherein the content of the first and second substances,
the detection probe is used for acquiring a first sound pressure signal generated by a first detection position of an object to be detected through a plurality of microphones;
the microprocessor is used for receiving the first sound pressure signal, determining a first relative position relation between an abnormal sound source of the object to be detected and a first detection position according to the magnitude relation of the first sound pressure signal, and generating a first moving signal or a first detection completion signal according to the first relative position relation; the first moving signal is used for determining a first to-be-moved direction of the probe, and the first detection completion signal is used for determining completion of detection of an abnormal sound source of the object to be detected;
the probe moving indicator is used for receiving the first moving signal or the first detection completion signal, and indicating the first direction to be moved according to the first moving signal, or indicating the completion of the detection of the abnormal sound source of the object to be detected according to the first detection completion signal.
Wherein the process of generating the first detection completion signal is as follows:
the microprocessor determines whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is positioned in the preset radius of the first detection position, generating a first detection completion signal. The preset radius of the first detection position is a circular area within a certain distance range radiating to the periphery by taking the first detection position as a center of circle.
The process of generating the first movement signal is as follows:
the microprocessor determines whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is not positioned in the preset radius of the first detection position, generating a first moving signal.
After generating the first movement signal, performing the following operations:
a probe movement indicator, further to: acquiring a second sound pressure signal generated by a second detection position through the plurality of microphones after indicating the first direction to be moved according to the first movement signal, wherein the second detection position is different from the first detection position;
a microprocessor further configured to: receiving the second acoustic pressure signal, determining a second relative position relationship between the abnormal sound source of the object to be detected and a second detection position according to the magnitude relationship of the second acoustic pressure signal, and generating a second movement signal or a second detection completion signal according to the second relative position relationship; the second moving signal is used for determining a second to-be-moved direction of the probe, and the second detection completion signal is used for determining completion of detection of the abnormal sound source of the object to be detected;
a probe movement indicator, further to: and receiving a second moving signal or a second detection completion signal, and indicating a third to-be-moved direction of the detection probe according to the second moving signal or indicating completion of detection of the abnormal sound source of the object to be detected according to the second detection completion signal.
As shown in fig. 2, the stent provided by the present application may be a stent formed by connecting the ends a of a plurality of stent arms and suspending the ends B thereof, the stent is formed by using the connected ends a as the center and using the plurality of stent arms to radiate outward, the plurality of stent arms are located on the same plane, and the distances between the ends B of two adjacent stent arms are equal. A microphone is arranged at the end B of each support arm, a plurality of microphones are also positioned on the same plane, and the distance between the microphones on two adjacent support arms is equal. A handle may be provided on the carriage for ease of handling to move the probe head.
When the detection probe is used for detecting the surface of an object to be detected, the position where the abnormal sound source is most likely to exist can be judged manually, and the position where the abnormal sound source is most likely to exist is used as a first detection position, so that the detection frequency can be reduced to a certain extent, and the detection efficiency of the abnormal sound source is further improved; or arbitrarily determining a detection position as a first detection position; the probe can be moved by the pointer to a position on the moving direction indicated by the pointer as the first detection position. The determination manner of the first detection position may be determined according to the requirement of specific detection efficiency.
The A end of the probe is placed on the surface or above the first detection position, and a first sound pressure signal near the first detection position is collected through a microphone. The acquired first sound pressure signals are transmitted to the microprocessor, the microprocessor determines a first relative position relation between the abnormal sound source and a first detection position (the first detection position is the position where the A end is located at present and corresponds to the object to be detected) according to the magnitude relation among the acquired first sound pressure signals, and when the abnormal sound source is located within a preset radius of the first detection position, the abnormal sound source is found; when the abnormal sound source is outside the preset radius of the first detection position, the abnormal sound source is located at a certain distance from the first detection position.
When the abnormal sound source is located outside the preset radius of the first detection position, the microprocessor can determine the position (namely the first to-be-moved direction) of the abnormal sound source relative to the first detection position according to the magnitude relation among the first sound pressure signals, then the microprocessor controls the probe moving indicator to indicate the first to-be-moved direction according to the first to-be-moved direction, the probe is manually moved in the first to-be-moved direction according to the indication of the probe moving indicator, and the moving distance can be determined according to the actual situation.
When the probe is manually moved for a certain distance along the first direction to be moved to reach a second detection position, the second detection position is detected through the microphone to obtain a second sound pressure signal, the collected second sound pressure signal is transmitted to the microprocessor, the microprocessor determines a second relative position relation between the abnormal sound source and the second detection position (the second detection position is the current position of the end A, is different from the first detection position, and is in the first direction to be moved determined by the first detection position) according to the magnitude relation among the collected second sound pressure signals, and when the abnormal sound source is located within the preset radius of the second detection position, the abnormal sound source is found; when the abnormal sound source is outside the preset radius of the second detection position, the abnormal sound source is located at a certain distance from the second detection position.
And when the abnormal sound source is away from the second detection position by a certain distance, determining a third direction to be moved, moving the probe to a third detection position, and repeating the process until the abnormal sound source is found.
The practical operation is explained, namely, an operator holds the detection device by hand, places the detection probe at the first detection position for detection, and determines whether the first detection position is the position of the abnormal sound source; when the result is positive, the detection work of the abnormal sound source is finished; when the result is negative, the probe moving indicator indicates to the operator which direction the probe should be moved next, and then determines whether the next detection position (i.e. the second detection position) is the position of the abnormal sound source. By repeatedly executing the process, the abnormal sound source can be quickly found.
Now, the above technical solution is explained by using an example, as shown in fig. 3, the number of microphones is 4, the number of support arms is 4, and any two adjacent support arms are perpendicular to each other; 4 microphones and 4 support arms one-to-one correspond, the B end of each support arm is provided with one microphone, and the A end of each support arm is connected together. Because 4 support arms are evenly distributed, 4 support arms form a cross.
For convenience of subsequent description, as shown in fig. 3 and 4, the 4 microphones are respectively denoted as M1, M2, M3 and M4, the 4 support arms are divided into two groups, each group is composed of two opposite support arms, straight lines where the two groups of opposite support arms are located are respectively denoted as L1 and L2, and bisectors of angles between L1 and L2 are denoted as L3 and L4. The distance D between each microphone and the end A is equal, the calculation formula of the distance D is D-D/2, wherein D-340/f, 340 is the sound velocity in the air (340m/s), and f is the lower limit frequency of the frequency range of the abnormal sound source of the object to be measured. For example, when f is 2000Hz, D is 0.17 m.
The 4 support arms are positioned on the same plane, and the distances between the ends B of the two adjacent support arms are equal; the 4 microphones are positioned on the same plane, and the distances between the two adjacent microphones are equal, so that the consistency of the detection conditions of the sound pressure near the A end of the 4 microphones can be ensured as much as possible.
After the probe head collects a first sound pressure signal generated by a first detection position through 4 microphones, the microprocessor performs the following operations:
step 1, sequencing 4 collected first sound pressure signals in a descending order, and marking the 4 sequenced first sound pressure signals as V1, V2, V3 and V4 respectively;
step 2, determining the difference between two adjacent first sound pressure signals, and recording the difference as D1, D2 and D3 respectively; wherein D1-V1-V2, D2-V2-V3, and D3-V3-V4;
step 3, comparing D1, D2 and D3 with the intra-cluster difference value D0 respectively, wherein the comparison result comprises the following two aspects:
in a first aspect: when D1< D0, D2< D0 and D3< D0, determining that the abnormal sound source of the object to be detected is located within a preset radius of the first detection position, and generating a first detection completion signal;
in a second aspect: when D1< D0, D2> D0, D3< D0, or D1> D0, D2< D0, D3> D0, determining that the abnormal sound source of the object to be detected is not located within the preset radius of the first detection position, and generating a first movement signal.
The first sound pressure signals detected by the 4 microphones M1, M2, M3, and M4 may be sequentially denoted as SPL1, SPL2, SPL3, and SPL4, and due to the difference in position between the abnormal sound source and the 4 microphones, the first sound pressure signal is larger for the microphone closer to the abnormal sound source, and the first sound pressure signal is smaller for the microphone farther from the abnormal sound source. Therefore, the magnitude relationship of the SPL1, the SPL2, the SPL3, and the SPL4 can preliminarily determine which microphone the abnormal sound source is closest to. After preliminarily determining the magnitude relation between the sound pressure signals, the general direction of the abnormal sound source can be roughly determined without performing other calculations. However, this method is not sufficiently efficient in detection, and therefore, further processing and comparison of the sound pressure signal are required. The method sets an intra-cluster difference value D0, and determines the size relationship among SPL1, SPL2, SPL3 and SPL4 through D0. The formula of the cluster internal difference limit value is D0-delta-D, wherein delta is a constant and is adjusted and set according to the experimental data of a specific probe; d is twice the distance D between the microphone and the a-side, i.e., the distance between M1 and M3 in fig. 3 and 4.
Comparing D1, D2, and D3 with the intra-cluster difference value D0, respectively, the following three cases (except for the following 3 cases, other results can only exist theoretically, and are not present in actual physical operation) occur, including case 1, case 2, and case 3, as follows:
case 1: when D1< D0, D2< D0 and D3< D0, determining that the abnormal sound source of the object to be detected is located within the preset radius of the first detection position, and generating a first detection completion signal.
Since V1, V2, V3, and V4 are sorted in descending order, it can be found that the distance between the abnormal sound source and the microphone corresponding to V1 is the smallest.
The differences D1, D2, D3 are all smaller than D0, which means that the differences between V1, V2, V3 and V4 are small, and therefore, the abnormal sound source is within the preset radius of the first detection position, namely, in the vicinity of the current position of the a-end.
Here, when V1, V2, V3, and V4 are all equal, it means that the source of abnormal noise is at the first detection position. As shown in fig. 4, the diamonds in fig. 4 are the identifications of the sources of the abnormal sound. The source of the abnormal sound referred to in case 1 is at the intersection of L1 and L2 in fig. 4.
Case 2: when D1< D0, D2> D0 and D3< D0, the microprocessor determines that the abnormal sound source of the object to be detected is positioned between the included angles of the two support arms where the two microphones are positioned and corresponding to V1 and V2; generating a first movement signal; the first movement signal is used for determining a first direction to be moved of the probe head, wherein the first direction to be moved is a direction between included angles along which the two microphone arms corresponding to the V1 and the V2 are located.
D1< D0 means that there is little difference between V1 and V2, i.e., there is little difference in the distance between the source of the abnormal sound and the corresponding microphones of V1 and V2, wherein the source of the abnormal sound is closer to the corresponding microphone of V1.
D2> D0 means that the difference between V2 and V3 is large, i.e. the distance between the source of the abnormal sound and the corresponding microphone of V2 and V3 is large, wherein the source of the abnormal sound is closer to the corresponding microphone of V2, and the distance between the source of the abnormal sound and the corresponding microphone of V3 is larger than that of the corresponding microphone of V2.
D3< D0, meaning that there is little difference between V3 and V4; meaning that the difference between V3 and V4 is not large, i.e. the distance between the source of the abnormal sound and the corresponding microphones of V3 and V4 is not large.
In summary, since D2> D0, the distance between the abnormal sound source and the microphone corresponding to V3 and V4 is far, and the abnormal sound source is closer to the microphone corresponding to V1 and V2, compared with the microphone corresponding to V2. And the distance between the abnormal sound source and the microphones corresponding to V1 and V2 is similar, and the distance between the abnormal sound source and the microphones corresponding to V3 and V4 is also similar, so that the sound pressure signals can be divided into two clusters including "V1 and V2", and "V3 and V4". Further, it can be considered that the abnormal noise source is located in the vicinity of a bisector of an angle between the straight lines of the microphones corresponding to V1 and V2, and more specifically, the abnormal noise source is located in a region between the bisector and the microphone corresponding to V1.
As can be seen from fig. 4, case 2 may cover all cases where the abnormal sound source is near L3 and L4.
More specifically, when V1 ═ V2> V3 ═ V4, it means that the source of abnormal sound is on the bisector of the angle of the straight line on which the microphones corresponding to V1 and V2 are located, that is, the source of abnormal sound is in any direction of the front left, rear left, front right, or rear right of the a end. Such as the sources of abnormal sounds represented by P3 and P4 shown in fig. 4.
Case 3: when D1> D0, D2< D0, D3> D0, the microprocessor determines that the abnormal sound source of the object to be detected is positioned on the line of the bracket arm where the microphone corresponding to V1 is positioned; generating a first movement signal; the first movement signal is used to determine a first direction to be moved of the probe head, wherein the first direction to be moved is along the arm of the microphone corresponding to V1.
D1> D0 means that the difference between V1 and V2 is large, i.e. the distance between the source of the abnormal sound and the corresponding microphone of V1 and V2 is large, wherein the source of the abnormal sound is closer to the corresponding microphone of V1 and the source of the abnormal sound is farther from the corresponding microphone of V2 than the corresponding microphone of V1.
D2< D0 means that there is little difference between V2 and V3, i.e., there is little difference in the distance between the source of the abnormal sound and the corresponding microphones of V2 and V3, wherein the source of the abnormal sound is closer to the corresponding microphone of V2. Since D1> D0, the distance between the source of abnormal noise and the sensor corresponding to V1 is much longer than the distance between the source of abnormal noise and the sensors corresponding to V2 and V3.
D3> D0 means that the difference between V3 and V4 is large, i.e. the distance between the source of the abnormal sound and the corresponding microphone of V3 and V4 is large, wherein the source of the abnormal sound is closer to the corresponding microphone of V3 and the source of the abnormal sound is farther from the corresponding microphone of V4 than the corresponding microphone of V3. Due to D1> D0 and D3> D0, the distance between the abnormal sound source and the sensor corresponding to V1 is far more than the distance between the abnormal sound source and the sensor corresponding to V2 and V3; the distance between the abnormal sound source and the sensor corresponding to V2 or V3 is far greater than the distance between the abnormal sound source and the sensor corresponding to V3 or V4.
In summary, the sound pressure signals can be divided into 3 clusters, specifically, "V1", "V2, V3", and "V4", and therefore, it can be determined that the source of the abnormal sound is in the vicinity of the straight line where the microphone corresponding to V1 is located.
As can be seen from fig. 4, the case 3 can cover all cases where the abnormal sound source is near L1 and L2, that is, for the a end, the abnormal sound source is in some direction of front, back, left, and right of the a end.
More specifically, when V1> V2 ═ V3> V4, it means that the source of the abnormal sound is on a straight line where the microphone corresponding to V1 is located. Such as the sources of abnormal sounds represented by P1 and P2 shown in fig. 4.
In the actual operation process, when the above-mentioned situation 2 or situation 3 is met, the probe needs to be moved according to the first relative position relationship of the abnormal sound source equivalent to the first detection position, when the probe moves to the second detection position, the voltage signal of the second detection position is collected again, and the second relative position relationship between the abnormal sound source and the second detection position is further determined, when the abnormal sound source is within the preset radius of the second detection position, it means that the abnormal sound source has been found; when the abnormal sound source is outside the preset radius of the second detection position, the abnormal sound source is located at a certain distance from the second detection position. And when the abnormal sound source is away from the second detection position by a certain distance, determining a third direction to be moved, moving the probe to a third detection position, and repeating the process until the abnormal sound source is found.
In addition, there are many corresponding relations between V1-V4 and M1-M4 in theory (mathematics), but some corresponding relations do not appear in actual physical conditions, for example, the present application cannot assume that V1 is SPL1, V2 is SPL2, V3 is SPL3, and V4 is SPL4, which does not exist in actual physical processes.
This application is judged the size of the acoustic pressure signal of gathering, and then confirms the relative position relation between abnormal sound source and the A end, moves the probe according to the relative position relation, under the condition that need not detect the object that awaits measuring point by point, alright in order to realize the detection in abnormal sound source fast, has improved detection efficiency, has reduced the detection cost, has avoided operating personnel to professional's high requirement, has reduced staff's cost.
Based on above-mentioned technical scheme, be provided with a plurality of mounting holes on every support arm that provides in this application, as shown in fig. 3, the circle of the unshaded part that appears between A end and B end is the schematic structure drawing of mounting hole. The mounting hole is used for mounting a microphone; the distances between the plurality of mounting holes on the same support arm and the end A are different, and the position of the sensor on the support arm can be changed according to the specific requirements of the abnormal sound source. For example, the distance between each microphone and the A end is determined by determining the abnormal sound frequency range of the abnormal sound source of the object to be measured, and each microphone is installed in the installation hole with the corresponding distance.
Specifically, the mounting hole is selected according to the formula D-2 x D-340/f, D is the distance between the mounting hole for mounting the microphone and the end a, 340 is the sound velocity in air (340m/s), and f is the lower limit frequency of the frequency range of the abnormal sound source of the object to be measured. When the lower limit frequency of the abnormal sound source (the frequency of the abnormal sound source is a range) is lower, the wavelength of the abnormal sound source is longer, and the mode that the microphone is far away from the A end is adopted for detection in consideration of the fact that the sound wave with longer wavelength is easy to diffract; when the lower limit frequency of the abnormal sound source is higher, the wavelength of the abnormal sound source is shorter, and the abnormal sound source can be detected in a mode that the microphone is closer to the A end.
Further, the probe movement indicator provided by the present application, as shown in fig. 5, sequentially includes, in a clockwise order from the leftmost indicator in fig. 5, a left indicator, a left front indicator, a right rear indicator, a rear indicator, and a left rear indicator, and a circular structure in the middle identifies the detection completion indicator. When the relative position relation between the abnormal sound source and the position of the end A is determined, the corresponding indicator is lightened, and the position of the probe head which should move is indicated. The number or direction of the indicators on the movable indicator can be adjusted according to the actual detection accuracy, and when the detection accuracy requirement is higher, more indicators can be arranged to obtain a more definite orientation result. When the accuracy of detection is not high, fewer indicators may be set to indicate only one approximate bearing.
The method comprises the steps that an object to be detected is detected through a plurality of microphones, a microprocessor judges sound pressure signals of the microphones to determine the relative position relation of an abnormal sound source relative to the current detection position, and then the probe moving indicator indicates the relative position of the abnormal sound source relative to the current detection position, so that the purpose of efficiently and quickly finding the abnormal sound source is achieved; the sensor used in the application is only a microphone, and compared with the related technology, the application greatly reduces the hardware cost; by using the method and the device, the abnormal sound source can be detected only by understanding the indication of the probe moving indicator without related professional knowledge, and the operation is simple; the technical scheme that the surface of the object to be detected can be detected point by point only by using a complex detection instrument in the related technology is avoided, the position of the abnormal sound source can be determined only by detecting partial point positions of the object to be detected, the abnormal sound source detection time is saved, and the abnormal sound source detection efficiency is improved.
Based on the technical scheme, as shown in fig. 1, the system comprises a band-pass system filter bank, a frequency weighting network and a data acquisition unit, wherein a plurality of microphones are electrically connected with the band-pass system filter bank; the band-pass system filter bank, the frequency weighting network, the data acquisition unit, the microprocessor and the probe moving indicator are electrically connected in sequence;
the band-pass system filter bank is used for filtering sound pressure signals (sound pressure signals comprise a first sound pressure signal, a second sound pressure signal and other sound pressure signals collected by the microphone) collected by the microphone; the frequency weighting network is used for weighting and calculating the filtered sound pressure signals (the sound pressure signals comprise sound pressure signals collected by microphones such as a first sound pressure signal and a second sound pressure signal); the data acquisition unit is used for receiving the distance between the microphone and the A end;
a microprocessor further configured to: and determining the relative position relationship between the abnormal sound source of the object to be detected and the first detection position (the relative position relationship comprises the relative position relationship between the abnormal sound source and the current detection position, such as the first relative position relationship, the second relative position relationship and the like) according to the distance between the microphone and the A end and the weighted sound pressure signal (the sound pressure signal comprises the sound pressure signal collected by the microphone, such as the first sound pressure signal, the second sound pressure signal and the like).
The band-pass system filter bank provided by the application comprises various band-pass filters, and the types of the band-pass filters can be configured according to actual conditions, such as an octave system band-pass filter, an 1/3 octave system band-pass filter and the like. The choice of the band-pass filter can be chosen according to the frequency of the source of the abnormal noise.
The frequency weighting network includes a weighting network of a plurality of frequencies, such as linear weighting, A weighting, B weighting, C weighting, etc. The selection of the frequency weighting network can be determined according to the sensitivity of human ears to abnormal sound sources. For example, the weighted sound level a simulates the loudness of pure 40-square sound of human ears, and when a signal passes through, the low frequency and the middle frequency (below 1000 Hz) of the signal are greatly attenuated; the weighted sound level B simulates the loudness of pure 70 square sound of the human ear, and has certain attenuation to the low frequency band of the signal; the C-weighted sound level simulates the loudness of the human ear to a pure 100 square tone, with a nearly flat response across the entire frequency range.
The data acquisition unit is internally provided with a power supply module which can supply power for the detection probe, the band-pass system filter bank, the frequency weighting network, the microprocessor and the probe moving indicator. Meanwhile, the data acquisition unit is provided with a knob for distance data between the microphone and the end A, and the distance data can be set according to the actual distance between the microphone and the end A. The distance between the microphone and the A end is determined, the distance between the microphone and the farthest microphone relative to the microphone can be determined, the relation between sound pressure data collected among the microphones is further judged, and the position of the abnormal sound source is further rapidly determined.
The sound pressure signal detected by the microphone can be amplified by an amplifier carried by the microphone; filtering the amplified sound pressure signal by one or more filters in a filter bank of a band-pass system; if all band-pass filters are selected, the signals are not filtered, and if one band-pass filter is not selected, no signals pass; weighting the filtered sound pressure signals through a frequency weighting network (the frequency weighting network is a single option, and only one frequency weighting network can be selected for one weighting), and sending the sound pressure signals to a data acquisition unit; the data acquisition unit sends the weighted sound pressure signal and the distance between the microphone and the A end to the microprocessor for processing, determines the relative position relationship between the abnormal sound source and the current position of the A end, further controls the probe moving indicator to indicate the relative position relationship, moves the probe, and further achieves the purpose of rapidly determining the abnormal sound source.
This application carries out corresponding processing through band-pass system filter bank, frequency weighting network and data collection station to the acoustic pressure signal of gathering, can improve the accuracy that probe surveyed the abnormal sound source, further improves the detection efficiency of abnormal sound source.
Since the electronic device described in this embodiment is an electronic device used for implementing the method for processing information in this embodiment, a person skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various variations thereof based on the method for processing information described in this embodiment, and therefore, how to implement the method in this embodiment by the electronic device is not described in detail here. Electronic devices used by those skilled in the art to implement the method for processing information in the embodiments of the present application are all within the scope of the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The abnormal sound source detection device is characterized by comprising a detection probe, a microprocessor and a probe movement indicator;
the probing probe comprises a plurality of microphones and a support having a plurality of support arms; the A ends of the support arms are connected together, and the B ends of the support arms are respectively provided with one microphone; the microphones are positioned on the same plane;
the probe moving indicator and the microphones are respectively and electrically connected with the microprocessor; wherein the content of the first and second substances,
the detection probe is used for acquiring a first sound pressure signal generated by a first detection position of an object to be detected through a plurality of microphones;
the microprocessor is used for receiving the first sound pressure signal, determining a first relative position relation between an abnormal sound source of the object to be detected and the first detection position according to the magnitude relation of the first sound pressure signal, and generating a first moving signal or a first detection completion signal according to the first relative position relation; the first moving signal is used for determining a first to-be-moved direction of the probe, and the first detection completion signal is used for determining that the detection of the abnormal sound source of the object to be detected is completed;
the probe moving indicator is used for receiving the first moving signal or the first detection completion signal, and indicating the first direction to be moved according to the first moving signal, or indicating the completion of the detection of the abnormal sound source of the object to be detected according to the first detection completion signal;
when the number of the microphones is 4 and the number of the support arms is 4, any two adjacent support arms are mutually vertical;
the probe is further configured to: acquiring the first sound pressure signal generated by the first detection position through 4 microphones;
the microprocessor is further configured to: sequencing the 4 collected first sound pressure signals in a descending order, and marking the 4 sequenced first sound pressure signals as V1, V2, V3 and V4 respectively; determining the difference between two adjacent first sound pressure signals, and respectively recording the difference as D1, D2 and D3; wherein D1-V1-V2, D2-V2-V3, and D3-V3-V4; comparing D1, D2 and D3 with an intra-cluster difference value D0 respectively; when D1< D0, D2< D0 and D3< D0, determining that the abnormal sound source of the object to be detected is located within a preset radius of the first detection position, and generating a first detection completion signal; when D1< D0, D2> D0, D3< D0, or D1> D0, D2< D0, D3> D0, determining that an abnormal sound source of the object to be detected is not located within a preset radius of the first detection position, and generating the first movement signal;
the first movement signal is used for determining the first direction to be moved of the probe head, wherein when D1< D0, D2> D0 and D3< D0, the first direction to be moved is a direction between included angles of lines where two microphones are located and the included angles of the lines are located, and the included angles of the lines correspond to V1 and V2; when D1> D0, D2< D0, D3> D0, the first direction to be moved is a direction along the support arm of the microphone corresponding to V1.
2. The apparatus of claim 1, wherein the microprocessor is specifically configured to:
determining whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is positioned in the preset radius of the first detection position, generating a first detection completion signal.
3. The apparatus of claim 1, wherein the microprocessor is specifically configured to:
determining whether the abnormal sound source of the object to be detected is located within a preset radius of the first detection position according to the first relative position relation; and when the abnormal sound source of the object to be detected is not positioned in the preset radius of the first detection position, generating the first moving signal.
4. The apparatus of claim 3, wherein the probe movement indicator is further to: acquiring a second sound pressure signal generated at a second detection position by the plurality of microphones after indicating the first direction to be moved according to the first movement signal, the second detection position being different from the first detection position;
the microprocessor is further configured to: receiving the second acoustic pressure signal, determining a second relative position relationship between the abnormal sound source of the object to be detected and the second detection position according to the magnitude relationship of the second acoustic pressure signal, and generating a second movement signal or a second detection completion signal according to the second relative position relationship; the second movement signal is used for determining a second to-be-moved direction of the probe, and the second detection completion signal is used for determining completion of detection of the abnormal sound source of the object to be detected;
the probe movement indicator is further configured to: and receiving the second movement signal or the second detection completion signal, and indicating a third to-be-moved direction of the detection probe according to the second movement signal, or indicating that the detection of the abnormal sound source of the object to be detected is completed according to the second detection completion signal.
5. The apparatus of claim 1, wherein the microprocessor is further configured to:
when D1< D0, D2> D0 and D3< D0, determining that the abnormal sound source of the object to be detected is positioned between the included angles of the two support arms where the microphones are positioned along the lines corresponding to V1 and V2; generating the first movement signal.
6. The apparatus of claim 1, wherein the microprocessor is further configured to:
when D1> D0, D2< D0, D3> D0, determining that the abnormal sound source of the object to be detected is positioned on the line of the bracket arm where the microphone is positioned corresponding to V1; generating the first movement signal; the first movement signal is used to determine the first direction of movement of the probing probe.
7. The apparatus of claim 1, wherein each of said support arms has a plurality of mounting holes formed therein for mounting said microphone;
and the distance between the mounting hole for mounting the microphone and the end A is determined according to the abnormal sound frequency of the abnormal sound source of the object to be measured.
8. The apparatus of claim 1, wherein the apparatus further comprises:
the system comprises a band-pass system filter bank, a frequency weighting network and a data acquisition unit, wherein a plurality of microphones are electrically connected with the band-pass system filter bank; the band-pass system filter bank, the frequency weighting network, the data collector, the microprocessor and the probe moving indicator are electrically connected in sequence;
the band-pass system filter bank is used for filtering the first sound pressure signal acquired by the microphone; the frequency weighting network is used for weighting and calculating the filtered first sound pressure signal; the data acquisition unit is used for receiving the distance between the microphone and the A end;
the microprocessor is further configured to: and determining the first relative position relation between the abnormal sound source of the object to be detected and the first detection position according to the distance between the microphone and the end A and the weighted first sound pressure signal.
9. The apparatus of any of claims 1-8, wherein the probe movement indicator comprises:
a left indicator, a left front indicator, a right rear indicator, a left rear indicator, and a detection completion indicator.
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