CN111289094A - Mobile vibration detection device and detection method thereof - Google Patents
Mobile vibration detection device and detection method thereof Download PDFInfo
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- CN111289094A CN111289094A CN201811495739.9A CN201811495739A CN111289094A CN 111289094 A CN111289094 A CN 111289094A CN 201811495739 A CN201811495739 A CN 201811495739A CN 111289094 A CN111289094 A CN 111289094A
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Abstract
The invention relates to a mobile vibration detection device, which comprises a vibration detection unit, an analog-digital conversion unit, a first band-pass filtering unit, a conversion operation module, a root-mean-square conversion module, a packet generation module and a communication transmission module. The vibration detection unit generates an acceleration analog signal. The analog-digital conversion unit generates an acceleration digital signal according to the acceleration signal. The first band-pass filtering unit and the conversion operation module generate a speed digital signal accordingly. The square root conversion module receives the acceleration digital signal and the speed digital signal and generates acceleration square root conversion data and speed square root conversion data according to the acceleration digital signal and the speed digital signal. The package generating module and the communication transmission module transmit the data for a detection person beside a power machine to directly interpret.
Description
Technical Field
The present invention relates to a vibration detection device, and more particularly, to a mobile vibration detection device.
Background
When the motor is applied to a power machine, the power machine will also vibrate during operation, for example: air compressor, water pump, speed reducer etc..
The vibration generated by the motor or the power machine in the abnormal state is different from the vibration generated in the normal state, so the inspector usually uses a vibration detection device to detect the motor or the power machine. The vibration detecting device is used for detecting the vibration acceleration and the vibration speed of the motor or the power machine.
However, the vibration acceleration and the vibration velocity detected by the vibration detecting device in the related art are analog signals. The vibration detection device needs to transmit the analog signal to a background processing end for processing operation, for example: root Mean Square (RMS) operation, Fast Fourier Transform (FFT) operation, Kurtosis (Kurtosis) operation, etc., so that the analog signal can be processed into a digital signal which can be interpreted by the detection personnel.
Therefore, it may take a lot of time for the detection personnel to detect the vibration acceleration and the vibration speed, and the result is that the motor or the power machine is in a normal state and no abnormality occurs. After the processing operation is performed through the background processing side, it is possible to confirm that the motor or the power machine is in an abnormal state. However, during the period of processing operation between the detection of the detection personnel and the background processing end, the motor or the power machine in an abnormal state still operates, which may result in deepening the damage degree of the motor or the power machine, reducing the service life of the motor or the power machine, and even posing a threat to the life safety of the detection personnel.
In addition, the analog signal is transmitted to the background processing end through the wire, and is easily interfered, causing signal distortion, and the use cost is expensive.
Disclosure of Invention
In view of the fact that the vibration detection device in the prior art can only detect and generate analog signals which cannot be interpreted, various problems are caused in the subsequent derivation. It is a primary objective of the claimed invention to provide a mobile vibration detecting apparatus to solve the problems of the prior art.
The present invention is directed to a portable vibration detection device, which is used for a detection person to carry to a power machine and set on the power machine to detect at least one vibration related data of the power machine, and includes a vibration detection unit, an analog-to-digital conversion unit, a first band-pass filtering unit, a conversion operation module, a root-mean-square conversion module, a packet generation module, and a communication transmission module.
The vibration detection unit is used for being fixed on a power machine so as to measure a plurality of acceleration pulses of the power machine in a measurement time interval and generate an acceleration analog signal according to the acceleration pulses. The analog-digital conversion unit is electrically connected with the vibration detection unit so as to receive the acceleration analog signal and generate an acceleration digital signal. The first band-pass filtering unit is electrically connected with the analog-digital conversion unit and is used for filtering the acceleration digital signal. The conversion operation module is electrically connected with the first band-pass filtering unit and used for receiving the acceleration digital signal and generating a speed digital signal according to the acceleration digital signal. The square root conversion module is electrically connected with the first band-pass filtering unit and the conversion operation module and used for receiving the acceleration digital signal and the speed digital signal and respectively generating acceleration square root conversion data and speed square root conversion data.
The packet generating module is electrically connected with the root mean square conversion module and used for receiving the acceleration root mean square conversion data and the speed root mean square conversion data and respectively generating an acceleration root mean square conversion data packet and a speed root mean square conversion data packet. And the communication transmission module is electrically connected with the packet generation module and used for receiving and transmitting the acceleration root-mean-square conversion data packet and the speed root-mean-square conversion data packet.
The acceleration root mean square conversion data packet and the speed root mean square conversion data packet are used for a display module located beside the power machine to display acceleration root mean square conversion data and speed root mean square conversion data represented by the acceleration root mean square conversion data packet and the speed root mean square conversion data packet so as to be read by a detection person located beside the power machine.
Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the conversion operation module in the mobile vibration detection device comprises an integration unit for integrating the acceleration digital signal into the velocity digital signal.
Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the conversion operation module in the mobile vibration detection device comprises a second band-pass filtering unit, and the second band-pass filtering unit is used for filtering out the speed digital signal.
Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is to make the mobile vibration detection device further comprise a fast fourier transform module, the fast fourier transform module is electrically connected to the first bandpass filtering unit, the transform operation module and the packet generation module, and is configured to receive the acceleration digital signal and the velocity digital signal, and generate an acceleration fourier transform data and a velocity fourier transform data, respectively, according to the acceleration digital signal and the velocity digital signal, wherein the acceleration fourier transform data and the velocity fourier transform data generate an acceleration fourier transform data packet and a velocity fourier transform data packet by the packet generation module, and transmit the acceleration fourier transform data packet and the velocity fourier transform data packet by the communication transmission module.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is that the mobile vibration detection device further comprises a clock generation unit and a frequency comparison unit, wherein the frequency comparison unit is electrically connected to the analog-to-digital conversion unit and the clock generation unit, and is configured to receive the acceleration digital signal and generate a frequency difference value accordingly.
Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the fast fourier transform module in the mobile vibration detection device comprises a window filter unit, a fast fourier operation unit and a frequency adjustment unit. The window type filtering unit is used for carrying out window type filtering on the acceleration digital signal and the speed digital signal. The fast Fourier operation unit is electrically connected with the window type filtering unit and is used for carrying out fast Fourier conversion on the acceleration digital signal and the speed digital signal after the window type filtering so as to respectively generate original acceleration Fourier conversion data and original speed Fourier conversion data. And the frequency adjusting unit is electrically connected with the fast Fourier operation unit and the frequency comparison unit and used for receiving the frequency difference, the acceleration Fourier conversion data and the original speed Fourier conversion data, and performing frequency difference adjusting operation on the acceleration Fourier conversion data and the original speed Fourier conversion data by utilizing the frequency difference value to generate the acceleration Fourier conversion data and the speed Fourier conversion data.
Based on the above technical means, an accessory technical means derived from the present invention is that the mobile vibration detection apparatus further comprises a kurtosis conversion module, wherein the kurtosis conversion module is electrically connected to the first bandpass filtering unit and the packet generation module, and is configured to receive the acceleration digital signal and generate kurtosis conversion data according to the acceleration digital signal, wherein the kurtosis conversion data is generated into a kurtosis conversion data packet by the packet generation module and is transmitted by the communication transmission module.
Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the kurtosis conversion module in the mobile vibration detection device comprises a mean value operation unit and a kurtosis operation unit. The average value calculating unit is used for calculating an average value. The kurtosis operation unit is electrically connected with the average value operation unit, receives the average value and generates kurtosis conversion data according to the average value.
The present invention is directed to solve the problems of the prior art, and a necessary technical means is to provide a mobile vibration detection method for detecting at least one vibration-related data of a power machine by using the mobile vibration detection apparatus, which includes the following steps (a) to (g).
Step (a): the vibration detection unit is used for measuring a plurality of acceleration pulses of the power machine in a measuring time interval and generating an acceleration analog signal according to the acceleration pulses.
Step (b): the acceleration analog signal is received by the analog-digital conversion unit, and an acceleration digital signal is generated according to the acceleration analog signal.
Step (c): and performing a filtering operation on the acceleration digital signal by using the first band-pass filtering unit.
Step (d): the conversion operation module is used for receiving the acceleration digital signal and generating a speed digital signal according to the acceleration digital signal.
A step (e): the square root conversion module is used for receiving the acceleration digital signal and the speed digital signal and respectively generating acceleration square root conversion data and speed square root conversion data.
Step (f): the packet generation module is used for receiving the acceleration root mean square transformation data and the speed root mean square transformation data and respectively generating an acceleration root mean square transformation data packet and a speed root mean square transformation data packet.
Step (g): and the communication transmission module is used for receiving and transmitting the acceleration root mean square conversion data packet and the speed root mean square conversion data packet.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is that the mobile vibration detection apparatus in the mobile vibration detection method further comprises a fast fourier transform module, wherein the fast fourier transform module is electrically connected to the first bandpass filtering unit, the transform operation module and the packet generation module, and the mobile vibration detection method further comprises the following steps (h) to (j).
A step (h): the fast Fourier transform module is used for receiving the acceleration digital signal and the speed digital signal and respectively generating acceleration Fourier transform data and speed Fourier transform data.
Step (i): the packet generation module is used for receiving the acceleration Fourier transform data and the speed Fourier transform data and respectively generating an acceleration Fourier transform data packet and a speed Fourier transform data packet.
Step (j): and the communication transmission module is used for receiving and transmitting the acceleration Fourier transform data packet and the speed Fourier transform data packet.
Based on the above-mentioned technical solutions, an auxiliary technical solution derived from the present invention is that the mobile vibration detection apparatus in the mobile vibration detection method further includes a kurtosis transformation module, wherein the kurtosis transformation module is electrically connected to the first band-pass filtering unit and the packet generation module, and the mobile vibration detection method further includes the following steps (k) to (m).
Step (k): the kurtosis conversion module is used for receiving the acceleration digital signal and generating kurtosis conversion data according to the acceleration digital signal.
Step (l): the packet generation module is used for receiving the kurtosis conversion data and generating a kurtosis conversion data packet according to the kurtosis conversion data.
Step (m): the kurtosis conversion data packet is received and transmitted by the communication transmission module.
In view of the above, the mobile vibration detection device and the detection method thereof provided by the present invention can be directly read by an inspector located beside a power machine without performing an operation process by a background processing end, so as to solve various problems derived from the prior art that the vibration needs to be transmitted to the background processing end.
Drawings
FIG. 1 is a block diagram of a mobile vibration detecting apparatus according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart showing a preferred embodiment of the present invention for a mobile vibration detection method;
FIG. 3 is a flow chart showing another preferred embodiment of the present invention for a mobile vibration detection method; and
FIG. 4 is a flow chart showing another preferred embodiment of the present invention for a mobile vibration detection method.
Wherein, the reference numbers:
1 Mobile vibration detection device
11 vibration detecting unit
12A/D conversion unit
13 first bandpass filter unit
14 conversion operation module
141 integration unit
142 second band-pass filtering unit
15 square root-mean-root conversion module
16 package generating module
17 communication transmission module
18 fast fourier transform module
181-window type filtering unit
182 fast fourier arithmetic unit
183 frequency adjustment unit
19 clock generation unit
20 frequency comparison unit
21 kurtosis conversion module
211 average value operation unit
212 kurtosis arithmetic unit
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Referring to fig. 1, fig. 1 is a block diagram illustrating a mobile vibration detecting apparatus according to a preferred embodiment of the invention. As shown in the drawings, a mobile vibration detecting apparatus 1 is provided for a detecting person (not shown) to carry to a power machine (not shown) to arrange at the power machine, so as to detect at least one vibration related data of the power machine. The vibration correlation data may be a function or a value.
The mobile vibration detecting device 1 includes a vibration detecting unit 11, an analog-to-digital converting unit 12, a first band-pass filtering unit 13, a converting operation module 14, a root-mean-square converting module 15, a packet generating module 16, a communication transmission module 17, a fast fourier converting module 18, a clock generating unit 19, a frequency comparing unit 20, and a kurtosis converting module 21.
The vibration detection unit 11 is configured to be fixed to the power machine and measure a plurality of acceleration pulses of the power machine within a measurement time interval. Then, the vibration detection unit 11 generates an acceleration analog signal according to the acceleration pulse.
The analog-to-digital conversion unit 12 is electrically connected to the vibration detection unit 11 for receiving the acceleration analog signal and generating an acceleration digital signal accordingly. Since the analog signal cannot be directly processed or read by the detecting personnel, the analog signal needs to be converted into a digital signal. In the present embodiment, the ADC unit 12 is an Analog-to-digital converter (ADC, A/D or A to D).
The first band-pass filtering unit 13 is electrically connected to the analog-to-digital converting unit 12 for performing a filtering operation on the acceleration digital signal. Since the signal inevitably has some noise, the first band-pass filtering unit 13 is used to filter the noise in the acceleration digital signal, and only the signal of the specific frequency band is left. In the present embodiment, the first Band-Pass Filter unit 13 is a Band-Pass Filter (BPF).
The conversion operation module 14 is electrically connected to the first band-pass filtering unit 13, and is configured to receive the filtered acceleration digital signal and generate a speed digital signal accordingly.
In the present embodiment, the transforming operation module 14 includes an integrating unit 141 and a second band-pass filtering unit 142. The integrating unit 141 receives the acceleration digital signal and integrates the acceleration digital signal into a velocity digital signal. The second band-pass filtering unit 142 is electrically connected to the integrating unit 141, and filters the speed digital signal to filter noise in the speed digital signal and only leave a signal of a specific frequency band. In the embodiment, the integrating unit 141 is an integrator, but not limited thereto, and may be other elements having an integrating function. The second Band-Pass Filter unit 142, in this embodiment, employs a Band-Pass Filter (BPF).
The root-mean-square conversion module 15 is electrically connected to the first band-pass filtering unit 13 and the conversion operation module 14, and is configured to receive the acceleration digital signal and the speed digital signal, and generate acceleration root-mean-square conversion data and speed root-mean-square conversion data, respectively. The root-mean-square calculation is common knowledge in the art, and therefore, is not described in detail. The root-mean-square conversion module 15 can be a processor, a chip, etc. with root-mean-square conversion operation function.
The acceleration root mean square transformation data and the speed root mean square transformation data can be used for displaying the severity of the vibration and have definite specifications. According to the classification standard of ISO10816, assuming a motor newly shipped with 50kW power, the speed root mean square conversion data needs to be less than 1.12 mm/s. The mean square root transformation data of the velocity is between 1.12mm/s and 2.8mm/s, and belongs to an acceptable range. The mean square root transformation data for the velocities were between 2.8mm/s and 7.1mm/s, which is an unacceptable range. The root mean square of the velocity conversion data is larger than 7.1mm/s, and the method belongs to the range of serious damage.
Generally, vibration less than 10Hz is low frequency vibration, between 10Hz and 1000Hz is common frequency vibration, and vibration greater than 1000Hz is high frequency vibration. The acceleration root-mean-square conversion data is applied to an electromechanical device with the vibration frequency between 100 and 10000Hz, for example: speed reducers, and the speed root-mean-square conversion data are more commonly applied to electromechanical devices belonging to common frequency vibrations, such as: motors, blowers, generators, etc. Generally, when the vibration frequency falls within the range of intersection of the two (100Hz to 1000Hz), it is better to convert the data using the velocity square root.
The packet generating module 16 is electrically connected to the root-mean-square conversion module 15, and is configured to receive the acceleration root-mean-square conversion data and the speed root-mean-square conversion data, and generate an acceleration root-mean-square conversion data packet and a speed root-mean-square conversion data packet, respectively. The communication transmission module 17 is electrically connected to the packet generation module 16, and is configured to receive and transmit the acceleration root mean square root conversion data packet and the velocity root mean square root conversion data packet.
Since the mobile vibration detecting device 1 needs to transmit the detected signal, the packet generating module 16 needs to use the acceleration root mean square root conversion data and the velocity root mean square root conversion data as data (data) and respectively provide a header to generate an acceleration root mean square root conversion data packet and a velocity root mean square root conversion data packet. Then, the communication transmission module 17 is used to transmit the acceleration sqm conversion data packet and the speed sqm conversion data packet. In this embodiment, the communication transmission module 17 is a transmission module conforming to RS-485.
The acceleration root mean square root conversion data packet and the speed root mean square root conversion data packet are used for a display module (not shown) located beside the power machine to display the acceleration root mean square root conversion data and the speed root mean square root conversion data represented by the acceleration root mean square root conversion data and the speed root mean square root conversion data respectively. Therefore, a detection person beside the power machine can judge the acceleration root-mean-square conversion data and the speed root-mean-square conversion data.
When the detection personnel judge that the acceleration root-mean-square conversion data and the speed root-mean-square conversion data belong to the acceptable range, the current power machine is indicated to be free of abnormality, and other power machines can be detected. Compared with the prior art, the method can immediately know whether the vibration of the power machine is abnormal or not, and whether further detection is needed or other power machines can be detected.
The fast fourier transform module 18 is electrically connected to the first bandpass filtering unit 13, the transform operation module 14 and the packet generation module 16, and is configured to receive the acceleration digital signal and the velocity digital signal, and generate acceleration fourier transform data and velocity fourier transform data by using the fast fourier transform data, respectively. The fast fourier transform is a common knowledge in the art and will not be described in further detail.
In the present embodiment, the fft module 18 includes a window filter unit 181, a fft operation unit 182 and a frequency adjustment unit 183. The frequency comparing unit 20 is electrically connected to the clock generating unit 19 and the frequency adjusting unit 183 for receiving the acceleration digital signal and generating a frequency difference value accordingly.
The window type filtering unit 181 is configured to perform window type filtering on the acceleration digital signal and the speed digital signal, so that the head and tail signal energies of the acceleration digital signal are the same, and the head and tail signal energies of the speed digital signal are also the same. More specifically, the window filter unit 181 is a window filter for extracting a signal at a specific time from the digital signal and adjusting the signal to make the energy value of the start time and the energy value of the end time of the signal equal, so that the signal is close to a periodic signal.
The fast fourier operation unit 182 is electrically connected to the window filter unit 181, and is configured to perform fast fourier transform operation on the acceleration digital signal and the velocity digital signal to generate an original acceleration fourier transform data and an original velocity fourier transform data, respectively. Since the acceleration digital signal and the velocity digital signal are adjusted to be close to the periodic signal by the window filter unit 181, the fast fourier transform operation can be performed. The fast fourier operation unit 182 may be a processor, a chip, etc. with fast fourier transform operation function.
The frequency adjusting unit 183, electrically connected to the fast fourier computing unit 182 and the frequency comparing unit 20, receives the frequency difference, the acceleration fourier transform data, and the original velocity fourier transform data, and performs a frequency difference adjusting operation on the original acceleration fourier transform data and the original velocity fourier transform data by using the frequency difference, thereby generating the acceleration fourier transform data and the velocity fourier transform data. Wherein the acceleration Fourier transform data and the velocity Fourier transform data are functions.
It should be noted that, in the present embodiment, the vibration detection unit 11 is a micro-electromechanical sensor. In the embodiment, the clock generation unit 19 generates a standard clock, the frequency comparison unit 20 compares the difference between the standard clock and the clock, and the frequency adjustment unit 183 adjusts the frequency in the fast fourier transform. For example, if the clock rate is 1% slower than the standard clock rate, the frequency in the original speed fourier transform data is multiplied by the clock rate divided by the standard clock rate to obtain the real frequency.
Taking actual numbers as an example, the standard clock is 100kHz, the clock of the vibration detection unit 11 is 99kHz, and the frequency of a signal is 990Hz, and after the calculation by the fft module 18, the frequency of the signal is considered to be 1000 Hz. Therefore, the frequency comparison unit 20 corrects the frequency of the signal by multiplying 1000Hz by 990 (clock) divided by 1000 (standard clock).
The fast fourier transform module 18 transforms the amplitude into the distribution of the vibration energy at a specific frequency point (also called frequency domain) by using a fourier formula. The vibration energy of the power machine is distributed at fixed frequency points (such as fundamental frequency, frequency doubling, frequency tripling, etc.), so the condition of the power machine can be judged according to the vibration energy distribution situation.
When the vibration energy in the velocity fourier transform data occurs mainly at the fundamental frequency, i.e., a frequency doubling, it indicates that the power machine is in an unbalanced state. When the vibration energy mainly occurs at the double frequency, the power machine is in a non-centering state. When the vibration energy mainly occurs at a double frequency and a double frequency, the power machine is in a state of basic deformation or soft feet. When the vibration energy mainly occurs in first frequency doubling, second frequency doubling, third frequency doubling, fourth frequency doubling, fifth frequency doubling and sixth frequency doubling, the part of the power machine is indicated to be loose. It should be noted that the above situations are all established under the classification standard of ISO10816, that is, the speed root mean square conversion data is greater than 2.8mm/s, on the premise that the speed root mean square conversion data is beyond the acceptable range.
The packet generating module 16 receives the acceleration fourier transform data and the velocity fourier transform data, and generates an acceleration fourier transform data packet and a velocity fourier transform data packet accordingly. The communication transmission module 17 receives and transmits the acceleration fourier transform data packet and the velocity fourier transform data packet. And the display module positioned beside the power machine receives the acceleration Fourier transform data packet and the speed Fourier transform data packet and displays the acceleration Fourier transform data packet and the speed Fourier transform data respectively represented by the acceleration Fourier transform data packet and the speed Fourier transform data for the detection personnel to interpret.
The kurtosis conversion module 21 is electrically connected to the first band-pass filtering unit 13 and the packet generation module 16, and is configured to receive the acceleration digital signal and generate kurtosis conversion data according to the acceleration digital signal. Wherein kurtosis converts data into a numerical value. The packet generating module 16 receives the kurtosis transformation data and generates a kurtosis transformation data packet accordingly. The communication transmission module 17 receives and transmits the kurtosis conversion data packet.
In the present embodiment, the kurtosis conversion module 21 includes a mean operation unit 211 and a kurtosis operation unit 212. The average value calculating unit 211 is used for calculating an average value of the acceleration. The kurtosis operation unit 212, electrically connected to the average operation unit 211, receives the average value and generates the kurtosis transformation data accordingly. In the formula of kurtosis operation, a numerator is an expected value of the fourth power of the difference value between the vibration acceleration and the average value, and a denominator is an expected value of the square of the difference value between the vibration acceleration and the average value, and then the numerator is the square of the expected value. Through the above operation, kurtosis conversion data is obtained.
In general, the kurtosis transformation data will have a value less than 3. If the kurtosis transformation data is greater than 5, it indicates that the power machine is damaged, typically by the balls in the bearings in the power machine, and this is still true if the square root transformation data is outside the acceptable range. If the main energy in the speed Fourier transform data is matched to be more than 25 times of frequency, the bearing abnormity in the power machine can be completely determined.
The packet generating module 16 receives the kurtosis transformation data and generates a kurtosis transformation data packet accordingly. The communication transmission module 17 receives and transmits the kurtosis conversion data packet. And the display module positioned beside the power machine receives the kurtosis conversion data packet and displays the kurtosis conversion data represented by the kurtosis conversion data packet for the detection personnel to judge.
The display module is a display screen, can be a display screen alone, can also set up by power machinery, can be a screen of the mobile electronic device even more.
The mobile vibration detecting device 1 provided by the invention can directly transmit the acceleration root mean square root conversion data packet, the speed root mean square root conversion data packet, the acceleration Fourier conversion data packet, the speed Fourier conversion data packet and the kurtosis conversion data packet, and display the acceleration root mean square root conversion data, the speed root mean square root conversion data, the acceleration Fourier conversion data, the speed Fourier conversion data and the kurtosis conversion data represented by the acceleration root mean square root conversion data packet, the speed Fourier conversion data and the kurtosis conversion data by the display module so as to be directly read by a detecting person beside the power machine. The problems derived from the fact that the analog signals need to be transmitted to the background processing end in the prior art can be solved.
Next, referring to fig. 2, fig. 2 is a flowchart illustrating a method for mobile vibration detection according to a preferred embodiment of the present invention. As shown in the figure, a mobile vibration detection method is implemented by using the mobile vibration detection apparatus 1 shown in fig. 1. And includes the following steps S101 to S107.
Step S101: the vibration detection unit 11 is utilized to measure the acceleration pulses of the power machine within the measurement time interval, and accordingly, the acceleration analog signal is generated.
Step S102: the analog-to-digital conversion unit 12 is used for receiving the acceleration analog signal and generating an acceleration digital signal accordingly.
Step S103: the filtering operation is performed on the acceleration digital signal by the first band-pass filtering unit 13.
Step S104: the conversion operation module 14 is utilized to receive the acceleration digital signal and generate the speed digital signal accordingly.
Step S105: the root-mean-square conversion module 15 is used to receive the acceleration digital signal and the speed digital signal, and accordingly, the acceleration root-mean-square conversion data and the speed root-mean-square conversion data are generated respectively.
Step S106: the packet generation module 16 is utilized to receive the acceleration root mean square transformation data and the velocity root mean square transformation data, and generate the acceleration root mean square transformation data packet and the velocity root mean square transformation data packet respectively.
Step S107: the communication transmission module 17 is used to receive and transmit the acceleration sqm conversion data packet and the speed sqm conversion data packet.
The display module beside the power machine displays the acceleration root mean square conversion data and the speed root mean square conversion data represented by the acceleration root mean square conversion data packet and the speed root mean square conversion data packet for a detection person beside the power machine to interpret.
Next, referring to fig. 3, fig. 3 is a flowchart illustrating another preferred embodiment of the mobile vibration detection method according to the present invention. As shown in the figure, a mobile vibration detection method is implemented by using the mobile vibration detection apparatus 1 shown in fig. 1, and includes the following steps. The steps S101 to S104 are the same as those in fig. 2, and therefore are not described in detail.
Step S205: the fast fourier transform module 18 is utilized to receive the acceleration digital signal and the velocity digital signal, and accordingly generate an acceleration fourier transform data and a velocity fourier transform data, respectively.
Step S206: the packet generation module 16 is utilized to receive the acceleration fourier transform data and the velocity fourier transform data, and accordingly generate an acceleration fourier transform data packet and a velocity fourier transform data packet, respectively.
Step S207: the communication transmission module 17 is used to receive and transmit the acceleration fourier transform data packet and the velocity fourier transform data packet.
The display module beside the power machine displays the acceleration Fourier transform data packet and the speed Fourier transform data represented by the acceleration Fourier transform data packet and the speed Fourier transform data packet for a detection person beside the power machine to interpret.
Finally, referring to fig. 4, fig. 4 is a flow chart showing another preferred embodiment of the mobile vibration detection method according to the present invention. As shown in the figure, a mobile vibration detection method is implemented by using the mobile vibration detection apparatus 1 shown in fig. 1, and includes the following steps. The steps S101 to S104 are the same as those in fig. 2, and therefore are not described in detail.
Step S305: the kurtosis conversion module 21 is utilized to receive the acceleration digital signal and generate a kurtosis conversion data accordingly.
Step S306: the packet generation module 16 is utilized to receive the kurtosis transformation data and generate a kurtosis transformation data packet accordingly.
Step S307: the kurtosis conversion data packet is received and transmitted by the communication transmission module 17.
The kurtosis conversion data packet is used for indicating kurtosis conversion data, and the kurtosis conversion data packet is used for being interpreted by a detection person beside the power machine.
Referring to fig. 2 to 4 together, it should be noted that steps S105 to S107 in fig. 2 are defined as a first step cluster, steps S205 to S207 in fig. 3 are defined as a second step cluster, and steps S305 to S307 in fig. 4 are defined as a third step cluster.
The first, second and third clusters may be varied or combined according to actual needs. Preferably, the second cluster of steps is subsequent to the first cluster of steps, and the third cluster of steps is subsequent to the first cluster of steps and the second cluster of steps. The acceleration root-mean-square conversion data and the speed root-mean-square conversion data in the first step cluster can be used for detection personnel to judge whether the power machine is in an abnormal state.
However, the order of steps in the step clusters cannot be changed, that is, the order of steps performed in the first step cluster must be performed first in step S105, then in step S106, and finally in step S107. The second step cluster is the same as the third step cluster, and therefore, the description thereof is omitted.
In summary, the mobile vibration detecting device and the detecting method thereof provided by the present invention directly transmit the acceleration root mean square root conversion data packet and the velocity root mean square root conversion data packet by using the analog-digital conversion unit, the first bandpass filtering unit, the conversion operation module, the root mean square root conversion module, the packet generation module and the communication transmission module, so that the detecting personnel can interpret the acceleration root mean square root conversion data packet and the velocity root square root conversion data represented by the acceleration root mean square root conversion data packet and the velocity root square root conversion data packet.
Compared with the prior art, the mobile vibration detection device and the detection method thereof provided by the invention can be directly read by detection personnel beside the power machine without performing operation processing by the background processing end, so that various problems derived from the prior art that the vibration needs to be transmitted to the background processing end are solved.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims.
Claims (11)
1. A mobile vibration detection device is used for a detection person to carry to a power machine to be arranged at the power machine so as to detect at least one vibration related data of the power machine, and comprises:
the vibration detection unit is used for being fixed on the power machine so as to measure a plurality of acceleration pulses of the power machine in a measurement time interval and generate an acceleration analog signal according to the acceleration pulses;
an analog-digital conversion unit electrically connected to the vibration detection unit for receiving the acceleration analog signal and generating an acceleration digital signal;
the first band-pass filtering unit is electrically connected with the analog-digital conversion unit and is used for filtering the acceleration digital signal;
a conversion operation module electrically connected to the first band-pass filtering unit for receiving the acceleration digital signal and generating a speed digital signal according to the acceleration digital signal;
a root-mean-square conversion module, electrically connected to the first band-pass filtering unit and the conversion operation module, for receiving the acceleration digital signal and the speed digital signal, and generating an acceleration root-mean-square conversion data and a speed root-mean-square conversion data respectively;
a packet generating module, electrically connected to the root-mean-square conversion module, for receiving the acceleration root-mean-square conversion data and the speed root-mean-square conversion data, and generating an acceleration root-mean-square conversion data packet and a speed root-mean-square conversion data packet respectively; and
a communication transmission module, electrically connected to the packet generation module, for receiving and transmitting the acceleration sqm conversion data packet and the velocity sqm conversion data packet;
the acceleration root mean square conversion data packet and the speed root mean square conversion data packet are used for a display module located beside the power machine to display the acceleration root mean square conversion data packet and the speed root mean square conversion data represented by the acceleration root mean square conversion data packet and the speed root mean square conversion data packet so as to be interpreted by the detection personnel located beside the power machine.
2. The mobile vibration detecting device according to claim 1, wherein the converting module comprises an integrating unit, and the integrating unit is configured to integrate the acceleration digital signal into the velocity digital signal.
3. The mobile vibration detecting device according to claim 1, wherein the transforming operation module comprises a second band-pass filtering unit for filtering the speed digital signal.
4. The mobile vibration detecting apparatus according to claim 1, further comprising a fast fourier transform module electrically connected to the first bandpass filtering unit, the transform operation module and the packet generation module for receiving the acceleration digital signal and the velocity digital signal and generating an acceleration fourier transform data and a velocity fourier transform data, respectively, wherein the acceleration fourier transform data and the velocity fourier transform data are generated by the packet generation module to generate an acceleration fourier transform data packet and a velocity fourier transform data packet, and are transmitted by the communication transmission module.
5. The mobile vibration testing apparatus of claim 4, further comprising:
a clock generation unit; and
and the frequency comparison unit is electrically connected with the analog-digital conversion unit and the clock pulse generation unit and used for receiving the acceleration digital signal and generating a frequency difference value according to the acceleration digital signal.
6. The mobile vibration testing apparatus of claim 5, wherein the fast fourier transform module comprises:
the window type filtering unit is used for carrying out window type filtering on the acceleration digital signal and the speed digital signal;
a fast Fourier operation unit electrically connected to the window filter unit for performing fast Fourier transform on the acceleration digital signal and the speed digital signal after window filtering to generate an original acceleration Fourier transform data and an original speed Fourier transform data, respectively; and
and the frequency adjusting unit is electrically connected with the fast Fourier operation unit and the frequency comparison unit and used for receiving the frequency difference, the acceleration Fourier conversion data and the original speed Fourier conversion data, and performing frequency difference adjusting operation on the original acceleration Fourier conversion data and the original speed Fourier conversion data by utilizing the frequency difference value to generate the acceleration Fourier conversion data and the speed Fourier conversion data.
7. The mobile vibration detecting apparatus of claim 1, further comprising a kurtosis transforming module electrically connected to the first band-pass filtering unit and the packet generating module for receiving the acceleration digital signal and generating kurtosis transforming data according to the acceleration digital signal, wherein the kurtosis transforming data is transmitted by the communication transmitting module after the kurtosis transforming data is generated into a kurtosis transforming data packet by the packet generating module.
8. The mobile vibration detection apparatus of claim 7, wherein the kurtosis conversion module comprises:
an average value calculating unit for calculating an average value; and
a kurtosis computing unit electrically connected to the average computing unit for receiving the average value and generating the kurtosis transformation data.
9. A mobile vibration detection method for detecting at least one vibration-related datum of a power machine by using the mobile vibration detection apparatus of claim 1, comprising the steps of:
(a) measuring the acceleration pulses of the power machine within the measurement time interval by using the vibration detection unit, and generating the acceleration analog signal according to the acceleration pulses;
(b) receiving the acceleration analog signal by using the analog-digital conversion unit, and generating the acceleration digital signal according to the acceleration analog signal;
(c) performing the filtering operation on the acceleration digital signal by using the first band-pass filtering unit;
(d) receiving the acceleration digital signal by using the conversion operation module, and generating the speed digital signal according to the acceleration digital signal;
(e) utilizing the root-mean-square conversion module to receive the acceleration digital signal and the speed digital signal and respectively generate acceleration root-mean-square conversion data and speed root-mean-square conversion data;
(f) utilizing the packet generation module to receive the acceleration root mean square conversion data and the speed root mean square conversion data, and respectively generating the acceleration root mean square conversion data packet and the speed root mean square conversion data packet; and
(g) and the communication transmission module is used for receiving and transmitting the acceleration root mean square root conversion data packet and the speed root mean square root conversion data packet.
10. The mobile vibration detecting method of claim 9, wherein the mobile vibration detecting apparatus further comprises a fast fourier transform module electrically connected to the first bandpass filtering unit, the transform operation module and the packet generation module, the mobile vibration detecting method further comprising:
(h) utilizing the fast Fourier transform module to receive the acceleration digital signal and the speed digital signal and respectively generate acceleration Fourier transform data and speed Fourier transform data;
(i) utilizing the packet generation module to receive the acceleration Fourier transform data and the velocity Fourier transform data and respectively generate an acceleration Fourier transform data packet and a velocity Fourier transform data packet; and
(j) and the communication transmission module is used for receiving and transmitting the acceleration Fourier transform data packet and the speed Fourier transform data packet.
11. The mobile vibration detection method of claim 9, wherein the mobile vibration detection apparatus further comprises a kurtosis transformation module electrically connected to the first bandpass filtering unit and the packet generation module, the mobile vibration detection method further comprising:
(k) receiving the acceleration digital signal by using the kurtosis conversion module, and generating kurtosis conversion data according to the acceleration digital signal;
(l) Receiving the kurtosis conversion data by using the packet generating module, and generating a kurtosis conversion data packet according to the kurtosis conversion data; and
(m) receiving and transmitting the kurtosis transformation data packet by using the communication transmission module.
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