Broadband vibration monitoring device and design method thereof

Abstract

The invention belongs to the technical field of vibration monitoring, and particularly relates to a broadband vibration monitoring device and a design method thereof.The design method comprises the steps that a plurality of vibration sensors with different frequency bands are installed in the vibration monitoring device, the vibration sensors are controlled to conduct monitoring at the same time, and timestamps are marked on monitored signals; carrying out band-pass filtering on a signal received in an effective frequency band of each vibration sensor; and performing addition operation on the signals of different frequency bands after band-pass filtering based on the same timestamp, outputting a frequency band after addition operation, and performing analog-to-digital conversion on the output frequency band. According to the invention, a plurality of vibration sensors with different frequency bands are installed and controlled to monitor at the same time, so that comprehensive capture of broadband vibration signals can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration monitoring, and particularly relates to a broadband vibration monitoring device and a design method thereof. Background Art

[0002] In the technical field of vibration monitoring, traditional vibration sensors generally have the problem of limited monitoring frequency band range. Generally speaking, the frequency range that a low-frequency sensor can cover is roughly between 0.01 and 200 Hz, while a high-frequency sensor can monitor the frequency band of 60 to 1500 Hz. Although this clear frequency division meets the needs of specific applications to a certain extent, it also brings a significant challenge: it is difficult to simultaneously receive and effectively process high- and low-frequency vibration signals through a single sensor.

[0003] In complex environments such as coal mines, vibration monitoring is particularly important. Due to the complex geological conditions of coal mines, vibration signals often contain information in multiple frequency bands, and traditional vibration sensors cannot comprehensively capture these signals due to frequency band limitations. Summary of the Invention

[0004] Aiming at the defect in the prior art that it is difficult to simultaneously receive and effectively process high- and low-frequency vibration signals through a single sensor, the present invention provides a broadband vibration monitoring device and a design method thereof to solve the above technical problems.

[0005] In a first aspect, the present invention provides a design method for a broadband vibration monitoring device, including: Install a number of vibration sensors with different frequency bands in the vibration monitoring device, control the vibration sensors to monitor simultaneously, and mark time stamps on the monitored signals; Perform band-pass filtering on the signals received within the effective frequency band of each vibration sensor; Perform an addition operation on the signals of different frequency bands after band-pass filtering based on the same time stamp, output the frequency band after the addition operation, and perform analog-to-digital conversion on the output frequency band.

[0006] A further improvement of this technical solution is that the method for performing an addition operation on the signals of different frequency bands after band-pass filtering based on the same time stamp specifically includes: Use the same time stamp to align the starting points of a number of signals of different frequency bands; Perform sensitivity conversion on all the aligned signals to convert them into signals under a unified sensitivity; Superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

[0007] In a second aspect, the present invention provides a broadband vibration monitoring device based on the design method described in any one of the above, including: The vibration monitoring module includes several vibration sensors with different frequency bands, which are used to monitor vibration signals, mark time stamps for the monitored vibration signals at the same time, and upload the monitored vibration signals with time stamps; The filtering module is used to perform band-pass filtering on the vibration signals uploaded by the vibration sensors and upload the filtered vibration signals; The control module is used to control several vibration sensors to monitor vibration signals simultaneously, receive the vibration signals uploaded by the filtering module, perform sensitivity conversion on the received vibration signals, and superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

[0008] A further improvement of this technical solution is that the filtering module includes a band-pass filtering circuit configured for each vibration sensor.

[0009] A further improvement of this technical solution is that the band-pass filtering circuit includes a capacitor C1, a resistor R1, an operational amplifier U1, a resistor R2, a resistor R3, a resistor R4, and a capacitor C2; The first end of the capacitor C1 is connected to the first output end of the vibration sensor, the second output end of the vibration sensor is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1 and the non-inverting input end of the operational amplifier U1, the second end of the resistor R and the non-inverting input end of the operational amplifier U1, the second end of the resistor R1 is grounded, the inverting input end of the operational amplifier U1 is grounded through the resistor R2, the output end of the operational amplifier U1 is connected to the first end of the resistor R3 and the first end of the resistor R4, the second end of the resistor R3 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R4 is connected to the control module and the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

[0010] A further improvement of this technical solution is that the control module includes a main control chip, a signal superposition circuit, and an analog-to-digital conversion circuit. The input end of the signal superposition circuit is connected to the output end of the band-pass filtering circuit, the output end of the signal superposition circuit is connected to the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected to the input end of the main control chip; the vibration sensor is connected to the output end of the main control chip.

[0011] A further improvement of this technical solution is that the signal superposition circuit includes an operational amplifier U2, a resistor R5, a resistor R6, and several sensitivity adjustment resistors; The first end of each sensitivity adjustment resistor is connected to the output end of a band-pass filtering circuit, the second end of the sensitivity adjustment resistor is connected to the non-inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected to the input end of the analog-to-digital conversion circuit and the first end of the resistor R5, the second end of the resistor R5 is connected to the inverting input end of the operational amplifier U2 and the first end of the resistor R6, and the second end of the resistor R6 is grounded.

[0012] A further improvement of this technical solution is that the operational amplifier U2 uses an operational amplifier with the model number LM741.

[0013] A further improvement of this technical solution is that the analog-to-digital conversion circuit includes a sample-and-hold switch S1, a capacitor C3, and an encoder U3; The first end of the sample-and-hold switch S1 is connected to the output end of the operational amplifier U2, the second end of the sample-and-hold switch S1 is connected to the first end of the capacitor C3 and the input pin of the encoder U3, the second end of the capacitor C3 is grounded, and the output pin of the encoder U3 is connected to the input end of the main control chip.

[0014] A further improvement of this technical solution is that the encoder U3 uses an encoder with the model number Xinchi SC2245.

[0015] The beneficial effects of the present invention are as follows: By installing several vibration sensors with different frequency bands and controlling them to monitor simultaneously, the present invention can comprehensively capture broadband vibration signals. This improvement breaks the shackles of the frequency band limitation of traditional sensors, enabling more effective monitoring of vibration signals containing multiple frequency band information in complex environments, such as coal mines with complex geological conditions. This not only improves the accuracy and comprehensiveness of vibration monitoring but also provides a richer data basis for subsequent signal processing and analysis.

[0016] Secondly, the present invention performs band-pass filtering on the signals received within the effective frequency band of each vibration sensor itself, further improving the purity and credibility of the signals. Band-pass filtering can remove noise and interference, ensuring the accuracy and stability of subsequent signal processing. At the same time, by performing addition operations on the signals of different frequency bands after band-pass filtering based on the same time stamp, the present invention realizes the integration and superposition of multi-frequency band signals, thereby outputting a more complete and continuous vibration signal frequency band.

[0017] In addition, the design principle of the present invention is reliable, the structure is simple, and it has a very broad application prospect. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic flowchart of the method according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic block diagram of the device according to an embodiment of the present invention.

[0021] Figure 3 It is the schematic diagram of the band-pass filter circuit.

[0022] Figure 4 It is the schematic diagram of the signal superposition circuit.

[0023] Figure 5 It is the schematic diagram of the analog-to-digital conversion circuit.

[0024] Figure 6 It is the signal waveform diagram monitored by vibration sensors in two different frequency bands.

[0025] Figure 7 It is the signal waveform diagram processed by the wide-band vibration monitoring device.

[0026] 210 is the vibration monitoring module, 211 is the vibration sensor, 220 is the filtering module, 230 is the control module, 231 is the main control chip, 232 is the signal superposition circuit, and 233 is the analog-to-digital conversion circuit. Specific implementation manners

[0027] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the specific embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

[0029] As Figure 1 shown, the present invention provides a design method for a wide-band vibration monitoring device, including: Step 110, installing a plurality of vibration sensors with different frequency bands in the vibration monitoring device, controlling the vibration sensors to perform monitoring simultaneously, and marking time stamps on the monitored signals; Step 120, performing band-pass filtering on the signals received within the effective frequency band of each vibration sensor; Step 130, performing an addition operation on the signals in different frequency bands after band-pass filtering based on the same time stamp, outputting the frequency band after the addition operation, and performing analog-to-digital conversion on the output frequency band.

[0030] Further, an addition operation is performed on the signals of different frequency bands after band-pass filtering based on the same time stamp. The specific method includes: S131. Align the starting points of several signals of different frequency bands using the same time stamp; S132. Perform sensitivity conversion on all the aligned signals to convert them into signals under a unified sensitivity; S133. Superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

[0031] The present invention uses the same time stamp to align the starting points of signals of different frequency bands, which can ensure that each signal is consistent in time. This time alignment is the basis for subsequent signal processing and analysis, and helps to avoid errors caused by time misalignment. Performing sensitivity conversion on the aligned signals can eliminate the sensitivity differences between different signal sources. In this way, in the subsequent signal superposition process, the amplitude and phase information of each signal can be compared and analyzed more accurately. During the signal transmission and processing process, interference and noise are inevitable. Through time alignment and sensitivity conversion, each signal can be compared and analyzed under a unified standard, making it easier to identify and filter out interference and noise. Superimposing the amplitudes of different frequencies at the same time stamp can ensure the accuracy of the superposition result. This superposition operation helps to enhance the stability and reliability of the signal, providing more powerful support for subsequent signal processing and analysis. By superimposing the signals of different frequency bands after time alignment and sensitivity conversion, a comprehensive signal containing information of multiple frequency bands can be obtained. This comprehensive signal helps to more comprehensively understand the characteristics of the signal, providing more information for subsequent signal processing and analysis.

[0032] As Figure 2 shown, the present invention provides a wide-band vibration monitoring device based on the design method described in any one of the above. The device includes a vibration monitoring module, a filtering module, a control module, and a power supply module for supplying power to the entire device. Among them, the vibration monitoring module includes several vibration sensors of different frequency bands, which are used to monitor vibration signals, simultaneously mark time stamps on the monitored vibration signals, and upload the monitored vibration signals with time stamps; the filtering module is used to perform band-pass filtering on the vibration signals uploaded by the vibration sensors and upload the filtered vibration signals; the control module is used to control several vibration sensors to simultaneously monitor vibration signals, receive the vibration signals uploaded by the filtering module, perform sensitivity conversion on the received vibration signals, and superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

[0033] For example, filter the low-frequency sensor to obtain a 0.1 Hz - 100 Hz signal, and filter the high-frequency sensor to obtain a 100 Hz - 1500 Hz signal. After the two signals are superimposed, the bandwidth of the 0.1 Hz - 1500 Hz frequency band can be obtained. The specific superimposing method is to align the starting points of the signals using the same time stamp, use the control module to convert the sensitivities of different sensors into a unified sensitivity, and then perform an addition operation on the two signals.

[0034] Specifically, the filtering module includes a band-pass filtering circuit configured for each vibration sensor.

[0035] As Figure 3 shown, the band-pass filtering circuit includes a capacitor C1, a resistor R1, an operational amplifier U1, a resistor R2, a resistor R3, a resistor R4, and a capacitor C2; the first end of the capacitor C1 is connected to the first output end of the vibration sensor, the second output end of the vibration sensor is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1 and the non-inverting input terminal of the operational amplifier U1, the second end of the resistor R1 is grounded, the inverting input terminal of the operational amplifier U1 is grounded through the resistor R2, the output terminal of the operational amplifier U1 is connected to the first ends of the resistor R3 and the resistor R4, the second end of the resistor R3 is connected to the inverting input terminal of the operational amplifier U1, the second end of the resistor R4 is connected to the control module and the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

[0036] The band-pass filtering circuit corresponding to the second vibration sensor includes a capacitor C1, a resistor R1, an operational amplifier U1, a resistor R2, a resistor R3, a resistor R4, and a capacitor C2; the first end of the capacitor C1 is connected to the first output end of the vibration sensor, the second output end of the vibration sensor is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1 and the non-inverting input terminal of the operational amplifier U1, the second end of the resistor R1 is grounded, the inverting input terminal of the operational amplifier U1 is grounded through the resistor R2, the output terminal of the operational amplifier U1 is connected to the first ends of the resistor R3 and the resistor R4, the second end of the resistor R3 is connected to the inverting input terminal of the operational amplifier U1, the second end of the resistor R4 is connected to the control module and the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

[0037] Further, the control module includes a main control chip, a signal superimposing circuit, and an analog-to-digital conversion circuit. The input end of the signal superimposing circuit is connected to the output end of the band-pass filtering circuit, the output end of the signal superimposing circuit is connected to the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected to the input end of the main control chip; the vibration sensor is connected to the output end of the main control chip.

[0038] As Figure 4As shown in the figure, the signal superposition circuit includes an operational amplifier U2, a resistor R5, a resistor R6, and several sensitivity adjustment resistors; the first end of each sensitivity adjustment resistor is connected to the output end of a band-pass filter circuit, and the second end of the sensitivity adjustment resistor is connected to the non-inverting input end of the operational amplifier U2. The output end of the operational amplifier U2 is connected to the input end of the analog-to-digital conversion circuit and the first end of the resistor R5. The second end of the resistor R5 is connected to the inverting input end of the operational amplifier U2 and the first end of the resistor R6. The second end of the resistor R6 is grounded. Specifically, the operational amplifier U2 uses an operational amplifier with the model LM741. The sensitivity conversion can be achieved through the size of the sensitivity resistor and the ratio between the sensitivity resistors. For example, taking the device containing two vibration sensors with different frequency bands as an example, VOUT=(1+R4 / R5)*(R8*VOUT1+R7*VOUT2) / (R7+R8), where: VOUT is the total output sensitivity of the vibration monitoring device; VOUT1 is the output sensitivity of the first vibration sensor (the vibration sensor capable of collecting low-frequency signals); VOUT2 is the output sensitivity of the second vibration sensor (the vibration sensor capable of collecting high-frequency signals); the corresponding resistance values of R7 and R8 can be designed according to this relationship.

[0039] As Figure 5 shown in the figure, the analog-to-digital conversion circuit includes a sample-and-hold switch S1, a capacitor C3, and an encoder U3; the sample-and-hold switch S1 and the capacitor C3 can form a sample-and-hold circuit. Specifically, the first end of the sample-and-hold switch S1 is connected to the output end of the operational amplifier U2. The second end of the sample-and-hold switch S1 is connected to the first end of the capacitor C3 and the input pin of the encoder U3. The second end of the capacitor C3 is grounded. The output pin of the encoder U3 is connected to the input end of the main control chip. Specifically, the encoder U3 uses an encoder with the model Xinchi SC2245. The sample-and-hold switch S1 can quickly hold the analog signal output by the operational amplifier U2 at a certain level until the next sampling starts when it receives the analog signal output by the operational amplifier U2. This function ensures the stability and consistency of the analog signal during the sampling process and avoids sampling errors caused by signal fluctuations. Through the cooperation of the sample-and-hold switch S1 and the capacitor C3, the accurate capture of the analog signal can be realized. The capacitor C3, as the sampling capacitor, can store the signal level at the sampling moment and provide a stable input for the subsequent analog-to-digital conversion. The combined design of the sample-and-hold switch S1 and the capacitor C3 can resist the influence of external interference signals to a certain extent. When an external interference signal attempts to affect the sampling process, the sample-and-hold switch S1 can quickly cut off its connection with the analog signal to protect the accuracy of the sampling result. As the core component of the analog-to-digital conversion, the encoder U3 can ensure the fast and accurate conversion of the analog signal into a digital signal with its efficient working mode. At the same time, the use of the encoder U3 also reduces the power consumption and noise during the analog-to-digital conversion process.

[0040] If the signal waveform diagrams monitored by vibration sensors in two different frequency bands are as shown in Figure 6 , then the signal waveform diagram after being processed by the broadband vibration monitoring device provided by the present invention is as shown in Figure 7 . It can be seen that the present invention realizes the integration and superposition of multi-band signals, thereby outputting a more complete and continuous vibration signal frequency band.

[0041] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, and they should all be covered by the protection scope of the present invention.

Claims

1. A design method for a broadband vibration monitoring device, characterized in that, It includes: Install several vibration sensors with different frequency bands in the vibration monitoring device, control the vibration sensors to monitor simultaneously, and mark time stamps on the monitored signals; Perform band-pass filtering on the signals received within the effective frequency band of each vibration sensor; Perform addition operation on the signals of different frequency bands after band-pass filtering based on the same time stamp, output the frequency band after the addition operation, and perform analog-to-digital conversion on the output frequency band.

2. The design method of the broadband vibration monitoring device according to claim 1, characterized in that Performing an addition operation on the signals of different frequency bands after band-pass filtering based on the same time stamp, the method specifically includes: Use the same time stamp to align the starting points of several signals with different frequency bands; Perform sensitivity conversion on all the aligned signals to convert them into signals under a unified sensitivity; Superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

3. A broadband vibration monitoring device based on the design method described in any one of claims 1-2, characterized in that, It includes: A vibration monitoring module, including several vibration sensors with different frequency bands, used to monitor vibration signals, mark time stamps on the monitored vibration signals at the same time, and upload the monitored vibration signals with time stamps; A filtering module, used to perform band-pass filtering on the vibration signals uploaded by the vibration sensors and upload the filtered vibration signals; A control module, used to control several vibration sensors to monitor vibration signals simultaneously, receive the vibration signals uploaded by the filtering module, perform sensitivity conversion on the received vibration signals, and superimpose the amplitudes of different frequencies at the same time stamp after sensitivity conversion, and output the frequency band after amplitude superposition at all time stamps.

4. The broadband vibration monitoring device according to claim 3, wherein The filtering module includes a band-pass filtering circuit configured for each vibration sensor.

5. The broadband vibration monitoring device according to claim 4, wherein The band-pass filtering circuit includes a capacitor C1, a resistor R1, an operational amplifier U1, a resistor R2, a resistor R3, a resistor R4, and a capacitor C2; The first end of the capacitor C1 is connected to the first output end of the vibration sensor, the second output end of the vibration sensor is grounded, the second end of the capacitor C1 is connected to the first end of the resistor R1 and the non-inverting input end of the operational amplifier U1, the second end of the resistor R1 is grounded, the inverting input end of the operational amplifier U1 is grounded through the resistor R2, the output end of the operational amplifier U1 is connected to the first ends of the resistor R3 and the resistor R4, the second end of the resistor R3 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R4 is connected to the control module and the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

6. The broadband vibration monitoring device according to claim 4, wherein The control module includes a main control chip, a signal superposition circuit, and an analog-to-digital conversion circuit. The input end of the signal superposition circuit is connected to the output end of the band-pass filtering circuit, the output end of the signal superposition circuit is connected to the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected to the input end of the main control chip; the vibration sensor is connected to the output end of the main control chip.

7. The broadband vibration monitoring device according to claim 6, characterized in that, The signal superposition circuit includes an operational amplifier U2, a resistor R5, a resistor R6, and several sensitivity adjustment resistors; The first end of each sensitivity adjustment resistor is connected to the output end of a band-pass filter circuit, the second end of the sensitivity adjustment resistor is connected to the non-inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected to the input end of the analog-to-digital conversion circuit and the first end of the resistor R5, the second end of the resistor R5 is connected to the inverting input end of the operational amplifier U2 and the first end of the resistor R6, and the second end of the resistor R6 is grounded.

8. The broadband vibration monitoring device according to claim 7, characterized in that, The operational amplifier U2 uses an operational amplifier with the model number LM741.

9. The broadband vibration monitoring device according to claim 7, characterized in that, The analog-to-digital conversion circuit includes a sample-and-hold switch S1, a capacitor C3, and an encoder U3; The first end of the sample-and-hold switch S1 is connected to the output end of the operational amplifier U2, the second end of the sample-and-hold switch S1 is connected to the first end of the capacitor C3 and the input pin of the encoder U3, the second end of the capacitor C3 is grounded, and the output pin of the encoder U3 is connected to the input end of the main control chip.

10. The broadband vibration monitoring device according to claim 9, characterized in that, The encoder U3 uses an encoder with the model number Xinchi SC2245.

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