JP7443011B2 - Vibration analysis equipment and vibration measurement system - Google Patents

Description

The present invention relates to a vibration analysis device and a vibration measurement system, and particularly to a vibration analysis device that performs vibration analysis by receiving measurement data from a measuring device that measures the vibration of a rotating body to be measured, and a vibration measurement system equipped with the same. Regarding.

JP-A-2016-24007 (Patent Document 1) discloses a diagnostic system for rolling bearings and the like. In this diagnostic system, the information terminal transmits measurement data input from the vibration sensor, the model number of the object to be diagnosed, and data on the rotational speed at the time of measurement to the server. The server has specification data (specification data) of the diagnostic object for each model number, and uses the received measurement data with the specification data corresponding to the received model number and the received rotational speed data. The diagnostic results are processed and sent back to the information terminal. The information terminal then displays the diagnosis results returned from the server (see Patent Document 1).

JP 2016-24007 Publication

In the diagnostic system described in Patent Document 1, since the diagnosis is performed in the server, it is necessary to transfer data between the information terminal and the server. Therefore, it is necessary to prepare a network environment. Furthermore, depending on communication conditions, it may take time to transfer data, and it may take time for diagnostic results to be displayed on the information terminal.

Therefore, it is conceivable to perform diagnosis on an information terminal device without using a server. To perform a diagnosis on an information terminal, it is necessary to use the specification data of the measurement target or coefficient data calculated from the specification data using a predetermined calculation formula (specifically, periodically The information terminal possesses a coefficient of the rotation frequency of the measurement target (corresponding to the damage frequency when the rotation frequency of the measurement target is a unit frequency) for calculating the damage frequency, which indicates the frequency of vibration generated in the There is a need to. In this case, since the specifications of the measurement object are filled with the know-how of the manufacturer, it is necessary to give sufficient consideration to preventing leakage of the specification data or the coefficient data calculated from the specification data.

Therefore, an object of the present invention is to provide a vibration analysis device that performs vibration analysis by receiving measurement data from a measuring device that measures the vibration of a rotating body that is a measurement object, and that uses the specification data of the measurement object or the specification data. The purpose is to prevent leakage of calculated coefficient data.

A vibration analysis device according to an aspect of the present invention is a vibration analysis device that performs vibration analysis by receiving measurement data from a measuring device that measures the vibration of a rotating body that is a measurement target, and includes a database section and a processing section. Be prepared. The database section divides and stores a coefficient of the rotational frequency of the rotating body into a plurality of constants, which is used to calculate a damage frequency indicating a frequency of vibrations that occur periodically depending on a damaged part of the rotating body. When executing vibration analysis, the processing section reads out a plurality of constants from the database section, restores a coefficient of rotational frequency, and calculates a damage frequency using the restored coefficient.

The coefficient of the rotational frequency of the rotating body used to calculate the damage frequency of the rotating body includes information on the specifications of the rotating body, but in this vibration analysis device, the coefficient is divided into multiple constants. It is stored in the database section. Then, when vibration analysis is executed, a plurality of constants are read out from the database section, the coefficients of the rotational frequency are restored, and the damage frequency is calculated using the restored coefficients. Thereby, even if the data stored in the database section leaks to the outside, it is possible to prevent the specifications of the rotating body from being revealed. Therefore, according to this vibration analysis device, it is possible to prevent leakage of specification data of the rotating body that is the object of measurement.

Preferably, the database section stores encrypted data obtained by encrypting the plurality of constants described above. The processing section reads the encrypted data from the database section, decrypts it, and restores the coefficient from the plurality of decrypted constants.

Preferably, the database section stores the plurality of constants in binary format.
Further, a vibration analysis device according to another aspect of the present invention is a vibration analysis device that performs vibration analysis by receiving measurement data from a measuring device that measures the vibration of a rotating body that is a measurement target, and includes a database section and a processing section. It is equipped with a section. The database unit stores encrypted data obtained by encrypting specification data of the rotating body. When performing vibration analysis, the processing unit reads the encrypted data from the database unit, decrypts it, and uses the decrypted specification data to indicate the frequency of vibrations that occur periodically depending on the damaged part of the rotating body. Calculate the damage frequency.

In this vibration analysis device, the specification data of the rotating body used to calculate the damage frequency is encrypted and stored in the database section. When vibration analysis is executed, the encrypted data is read from the database and decrypted, and the decrypted specification data is used to indicate the frequency of vibrations that occur periodically depending on the damaged part of the rotating body. Damage frequency is calculated. Thereby, even if the data stored in the database section leaks to the outside, it is possible to prevent the specifications of the rotating body from being revealed. Therefore, according to this vibration analysis device, it is possible to prevent leakage of specification data of the rotating body that is the object of measurement.

Preferably, the database section stores encrypted data obtained by encrypting specification data in binary format.

Preferably, the rotating body is a bearing.
Preferably, the vibration analysis device further includes a communication unit that performs wireless communication with the measuring instrument.

Further, the vibration measurement system of the present invention includes a measuring device that measures the vibration of a rotating body to be measured, and the above-mentioned vibration analysis device that receives measurement data from the measuring device and performs vibration analysis.

According to the present invention, in a vibration analysis apparatus that receives measurement data from a measuring device that measures vibration of a rotating body that is a measurement object and performs vibration analysis, it is possible to prevent leakage of specification data of the measurement object.

1 is a diagram showing a vibration measurement system according to a first embodiment of the present invention. FIG. 3 is a diagram showing the configuration of a measuring device. It is a diagram showing the configuration of a mobile information terminal. FIG. 3 is a diagram illustrating an example of information set by a setting unit. FIG. 3 is a diagram showing an example of data stored in a database section. It is a flowchart which shows an example of the procedure of the process in a measuring instrument. It is a flowchart which shows an example of the procedure of a process in a portable information terminal. 3 is a diagram illustrating a configuration example of a portable information terminal in Embodiment 2. FIG. 12 is a flowchart illustrating an example of a processing procedure in a mobile information terminal according to a second embodiment. FIG. 3 is a diagram showing another configuration of the vibration measurement system.

Embodiments of the present invention will be described in detail below with reference to the drawings. In addition, the same reference numerals are attached to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram showing a vibration measurement system according to Embodiment 1 of the present invention. Referring to FIG. 1, vibration measurement system 10 includes a measuring device 20 and a mobile information terminal 30.

The measuring device 20 is a device for measuring vibrations occurring in the rolling bearing 15 that is the object of measurement, and includes an acceleration sensor (not shown) for detecting vibrations. The measuring device 20 is configured to be able to communicate wirelessly with the mobile information terminal 30, and upon receiving a measurement start signal from the mobile information terminal 30, detects vibrations occurring in the rolling bearing 15 using an acceleration sensor. Then, the measuring device 20 transmits the acceleration data detected by the acceleration sensor to the mobile information terminal 30.

The mobile information terminal 30 is a "vibration analysis device" in the present invention, and receives measurement data (vibration acceleration data) from the measuring device 20 and analyzes vibrations occurring in the rolling bearing 15. The mobile information terminal 30 is a terminal that can be used by a user who uses the vibration measurement system 10, and is, for example, a smartphone, a tablet, or the like. Application software running on the mobile information terminal 30 allows the mobile information terminal 30 to be used as a "vibration analysis device."

FIG. 2 is a diagram showing the configuration of the measuring device 20. Referring to FIG. 2, measuring instrument 20 includes an acceleration sensor 102, an antialiasing filter 104, an A/D converter 106, a microcomputer 108, a memory 110, and a communication module 112.

The acceleration sensor 102 is attached to a housing or the like that houses the rolling bearing 15 (FIG. 1) to be measured, and detects and outputs the acceleration of vibration generated in the rolling bearing 15. The anti-aliasing filter 104 is a low-pass filter for suppressing aliasing errors that occur during A/D conversion in the A/D converter 106. The A/D converter 106 converts the measurement signal (analog signal) that has passed through the anti-aliasing filter 104 into a digital signal.

Microcomputer 108 receives acceleration data converted into a digital signal by A/D converter 106 and outputs it to memory 110. When a predetermined amount of data is accumulated in the memory 110, the microcomputer 108 reads the accumulated data from the memory 110 and transmits it to the portable information terminal 30 via the communication module 112 as measurement data by the measuring device 20.

The memory 110 receives acceleration data converted into a digital signal by the A/D converter 106 from the microcomputer 108 and temporarily stores the acceleration data. The communication module 112 is a wireless module for the measuring device 20 to wirelessly communicate with the mobile information terminal 30.

FIG. 3 is a diagram showing the configuration of the mobile information terminal 30. Referring to FIG. 3, the mobile information terminal 30 includes a setting section 202, a communication section 204, an analysis section 206, a database (DB) section 208, a determination section 210, a display section 212, and a central processing section 214. including.

The setting unit 202 sets information regarding the rolling bearing 15 (FIG. 1) that is the measurement target. In the first embodiment, it is assumed that the information to be set is input by the user from the screen of the mobile information terminal 30, but it is stored in the DB section 208 in advance, and the information to be set is inputted by the user from the screen of the mobile information terminal 30. It may also be read from the DB section 208 at times. The information regarding the rolling bearing 15 includes the bearing model number of the rolling bearing 15, the rotational speed or rotational frequency of the rolling bearing 15 at the time of measurement by the measuring device 20, and the like.

In the first embodiment, for various types of bearings whose vibrations can be measured by the vibration measurement system 10, damage frequencies for identifying damaged parts of the bearings are calculated using a predetermined calculation formula using bearing specification data. Data regarding the coefficient of rotational frequency of the bearing (a plurality of constants obtained by dividing the coefficient) is stored in the DB unit 208 in association with the bearing model number (details will be described later). Then, data corresponding to the bearing model number set by the setting unit 202 is read from the DB unit 208, and based on the read data, the damage frequency is calculated and the damaged part is specified.

Further, the setting unit 202 further sets a determination reference value for determining the vibration state of the rolling bearing 15 that is the measurement target in the determination unit 210. In the first embodiment, this judgment reference value is also input by the user from the screen of the mobile information terminal 30, but it is stored in the DB section 208 in advance and used for vibration measurement by the vibration measurement system 10. It may also be read from the DB unit 208 at the start.

The communication unit 204 is a unit for the mobile information terminal 30 to wirelessly communicate with the measuring instrument 20, and is configured by a wireless module. The communication unit 204 transmits a measurement start signal to the measuring device 20 when the vibration measurement system 10 starts vibration measurement according to instructions from the central processing unit 214 . The communication unit 204 also receives measurement data (acceleration data) transmitted from the measuring device 20.

The analysis unit 206 performs frequency analysis of the measurement data (acceleration data) received by the communication unit 204. As an example, the analysis unit 206 performs fast Fourier transform (FFT) processing on the time-series acceleration data received by the communication unit 204 to generate a frequency spectrum of the measurement data (acceleration data).

The DB section 208 measures the BPFI (Ball Pass Frequency of Inner ring), BPFO (Ball Pass Frequency of Outer ring), and BSF (Ball Spin Frequency) of the rolling bearing 15 to be measured. Data regarding coefficients of rotational frequency of the shaft are stored in association with bearing model numbers for calculating respective rotational frequencies.

Specifically, in the first embodiment, the damaged area is identified in the portable information terminal 30 without using a server. Therefore, in order to calculate the BPFI, BPFO, and BSF of the rolling bearing 15 to be measured, it is necessary to store coefficients of the rotational frequency of the bearing in the mobile information terminal 30.

The BPFI, BPFO, and BSF of the rolling bearing 15 can be calculated using the following formulas (1) to (3) from various specifications of the rolling bearing 15 and the rotational frequency f0 of the inner ring shaft of the bearing at the time of measurement. can.

Here, D is the pitch diameter of the bearing, d is the diameter of the rolling element, α is the contact angle of the rolling element, and Z is the number of rolling elements, and each value corresponds to the specifications of the rolling bearing 15. be.

The rotation frequency f0 corresponds to the measurement condition, and is set by the setting unit 202, or if the rotation speed is set by the setting unit 202, it is calculated from the set rotation speed. The coefficients Cin, Cout, and Crol of the rotational frequency f0 are calculated from the specifications of the rolling bearing 15 (the pitch circle diameter D of the bearing, the diameter d of the rolling elements, the contact angle α of the rolling elements, and the number Z of the rolling elements).

In this way, in order to calculate BPFI, BPFO, and BSF in the mobile information terminal 30, the specification data of the rolling bearing 15 (the pitch circle diameter D of the bearing, the diameter d of the rolling element, the contact angle α of the rolling element, the rolling element It is necessary for the mobile information terminal 30 to hold the number Z) or the coefficients Cin, Cout, and Crol calculated from the specification data.

However, since the specifications of the measurement object are filled with the know-how of the manufacturer, it is necessary to give sufficient consideration to the leakage prevention of the specification data or the coefficients Cin, Cout, and Crol calculated from the specification data.

Therefore, in the vibration measurement system 10 according to the first embodiment, each of the coefficients Cin, Cout, and Crol is divided into a plurality of constants and stored in the DB unit 208 of the mobile information terminal 30. For example, the coefficients Cin, Cout, and Crol are divided into constants Ca to Cd shown in equations (4) to (6) below and stored in the DB unit 208.

Here, the constants Ca to Cd are as follows.

In this way, by dividing the coefficients Cin, Cout, and Crol calculated from specification data into a plurality of constants Ca to Cd and storing them in the DB section 208, the data stored in the DB section 208 can be This can prevent the specifications of the rolling bearing 15 that is the object of measurement from being revealed in the event of leakage.

The central processing unit 214 calculates the BPFI, BPFO, and BSF of the rolling bearing 15 at the time of measurement based on the information regarding the rolling bearing 15 set by the setting unit 202. Specifically, the central processing unit 214 reads a plurality of constants Ca to Cd corresponding to the bearing model number set by the setting unit 202 from the DB unit 208, and calculates the above formula from the read constants Ca to Cd. The coefficients Cin, Cout, and Crol are restored by (4) to (6). Then, the central processing unit 214 calculates the BPFI using the above equations (1) to (3) from the restored coefficients Cin, Cout, and Crol and the rotational speed (or rotational frequency) set by the setting unit 202. , BPFO, and BSF are calculated.

Furthermore, the central processing unit 214 identifies a region for each peak in the frequency spectrum of the acceleration data obtained by the analysis unit 206. Specifically, a peak whose frequency (hereinafter referred to as "peak frequency") coincides with the BPFI and its higher-order components is identified as having a defect in the inner ring. In addition, a peak whose peak frequency coincides with BPFO and its higher-order components is identified as a defect in the outer ring, and a peak whose peak frequency coincides with BSF and its higher-order components is identified as a defect in the rolling element. It is identified that this is occurring.

In addition, for peaks whose peak frequency matches the rotational frequency of the shaft and its high-order components, it is identified that the shaft is unbalanced, and the peak frequency coincides with the frequency twice the rotational frequency and its high-order components. Matching peaks are identified as having misalignment. In this way, in the first embodiment, regarding the parts corresponding to the peak, not only parts of the bearing (inner ring, outer ring, rolling elements) corresponding to BPFI, BPFO, and BSF but also shaft unbalance, misalignment, etc. Parts other than the bearing itself are also identified.

The determining unit 210 determines the vibration state for each peak based on the peak value (acceleration) of the peak frequency and the determination reference value set by the setting unit 202. For example, the determination unit 210 determines that a peak whose peak value exceeds the determination reference value is "dangerous." Further, for example, the determination unit 210 determines "caution" for a peak whose peak value is lower than the determination reference value but exceeds 80% of the determination reference value, and determines that a peak whose peak value is lower than 80% of the determination reference value is "caution". are judged as "good".

The display unit 212 displays the peak value, the site, and the determination result of the determination unit 210 (“dangerous,” “caution,” “good,” etc.) for the peak whose site has been identified on the screen of the mobile information terminal 30.

FIG. 4 is a diagram showing an example of information set by the setting unit 202. The information set by the setting unit 202 can be input by the user from the screen of the mobile information terminal 30, and FIG. 4 shows the screen of the mobile information terminal 30 for the user to input the information. .

Referring to FIG. 4, the bearing model number of the rolling bearing 15 (FIG. 1) to be measured can be input from the input unit 310.

From the input unit 320, the rotational speed (min ⁻¹ ) of the shaft at the time of measurement can be input. Note that this vibration measurement system 10 is not provided with a sensor that detects the rotational speed of the shaft during measurement by the measuring instrument 20, so it is necessary to obtain rotational speed information and input it from the input unit 320 when measuring. However, if a rotational speed sensor is attached, the input section 320 is unnecessary. Further, in the input section 320, instead of the rotational speed of the shaft at the time of measurement, the rotational frequency of the shaft at the time of measurement may be input.

A determination reference value (acceleration) used in the determination section 210 can be input from the input section 330 . Note that in the first embodiment, the determination reference value is a uniform value regardless of the peak frequency.

FIG. 5 is a diagram showing an example of data stored in the DB unit 208. Referring to FIG. 5, the DB unit 208 contains a plurality of constants Ca to Cd is stored in association with the bearing model number. With such constants Ca to Cd, even if leakage occurs outside the portable information terminal 30, the specifications of the bearing can be prevented from being revealed.

FIG. 6 is a flowchart showing an example of a processing procedure in the measuring device 20. As shown in FIG. Referring to FIG. 2 together with FIG. 6, when the power of measuring instrument 20 is turned on, microcomputer 108 executes a predetermined initialization process (step S10). In the initialization process, for example, communication is established between the communication module 112 and the portable information terminal 30, data in the memory 110 is cleared, and the like.

Next, the microcomputer 108 determines whether a measurement start signal has been received from the mobile information terminal 30 (step S20). When the measurement start signal is received (YES in step S20), the microcomputer 108 converts the output of the acceleration sensor 102, which has passed through the anti-aliasing filter 104 and has been digitally converted by the A/D converter 106, into A /D converter 106 (step S30).

The microcomputer 108 temporarily stores the data read from the A/D converter 106 in the memory 110 (step S40). Then, the microcomputer 108 determines whether the acquired data has reached a predetermined number (step S50), and if the acquired data has not reached a predetermined number (NO in step S50), steps S30 and S40 are performed. Repeat the process.

When it is determined in step S50 that the acquired data has reached the predetermined number (YES in step S50), the microcomputer 108 reads the acquired data from the memory 110 and transmits the data to the mobile information terminal 30 using the communication module 112. (Step S60).

Next, the microcomputer 108 determines whether the user has performed an end operation to end the measurement (step S70). Note that the end operation is performed on the mobile information terminal 30, and for example, when a measurement end signal is received from the mobile information terminal 30, it is determined that the end operation has been performed.

If it is determined that the end operation has not been performed (NO in step S70), the process returns to step S20. On the other hand, if it is determined that the end operation has been performed (YES in step S70), the process moves to end, and the series of processes in the measuring instrument 20 ends.

FIG. 7 is a flowchart illustrating an example of a processing procedure in the mobile information terminal 30. Referring to FIG. 3 together with FIG. 7, application software for performing vibration measurement using measuring instrument 20 is started on mobile information terminal 30, and when the application software is instructed to start measurement, the central processing unit 214 executes a predetermined initialization process (step S110). In the initialization process, for example, communication is established between the communication unit 204 and the measuring instrument 20, and a predetermined reset process is performed.

Next, in accordance with instructions from the central processing unit 214, the setting unit 202 determines the bearing model number of the rolling bearing 15 to be measured, the rotational speed (or rotational frequency) at the time of measurement, and the vibration state for determining the vibration state based on the measurement data. Judgment reference values and the like are set (step S115). Each of the above setting values is input by the user from the screen of the mobile information terminal 30.

Next, the central processing unit 214 reads the bearing constants Ca to Cd (division constants) corresponding to the set bearing model number from the DB unit 208, and uses the read constants Ca to Cd to calculate the above equations (4) to ( 6), the coefficients Cin, Cout, and Crol are restored (step S120).

Then, the central processing unit 214 uses the above equations (1) to (3) from the restored coefficients Cin, Cout, and Crol and the rotational frequency calculated from the rotational speed set in step S115. The BPFI, BPFO, and BSF of the rolling bearing 15 to be measured are calculated (step S122). Thereafter, the central processing unit 214 transmits a measurement start signal to the measuring device 20 through the communication unit 204 (step S125).

When the measurement start signal is transmitted to the measuring device 20, the central processing unit 214 determines whether measurement data (acceleration data) has been received from the measuring device 20 (step S130). When measurement data is received from the measuring device 20 (YES in step S130), the central processing unit 214 stores the received measurement data in a memory (not shown) (step S135).

Next, the central processing unit 214 determines whether the measurement data received from the measuring device 20 has reached a predetermined number (step S140), and if the data has not reached the predetermined number (NO in step S140), step The processes of S130 and S135 are repeated.

When it is determined in step S140 that the data has reached the predetermined number (YES in step S140), the central processing unit 214 reads the data from the memory, and the analysis unit 206 uses the data measured by the measuring device 20 (acceleration frequency analysis of the data) is performed (step S145). Specifically, fast Fourier transform (FFT) processing is performed on the time-series acceleration data measured by the measuring device 20, and a frequency spectrum of the measured acceleration data is obtained.

Next, the central processing unit 214 determines, regarding the peak in the obtained frequency spectrum, whether the peak frequency matches BPFI, BPFO, BSF, or any of their higher-order components, or the rotation frequency of the shaft, twice that frequency. It is determined whether the peak is caused by a defect such as inner ring, outer ring, rolling element, shaft unbalance, misalignment, etc., depending on the frequency of the peak and which of these high-order components it matches with. The central processing unit 214 then uses the determination unit 210 to determine the vibration state of each identified region based on the determination reference value set in step S115 (step S150).

For example, the determination unit 210 determines that a peak whose peak value exceeds the determination reference value is "dangerous." Furthermore, the determination unit 210 determines "caution" for peaks whose peak values are lower than the determination reference value but exceed 80% of the determination reference value, and for peaks whose peak values are lower than 80% of the determination reference value. It is judged as "good".

Then, the central processing unit 214 causes the display unit 212 to display the determination result of step S150, the peak value, the peak frequency, and the region together with the waveform of the frequency spectrum on the screen of the mobile information terminal 30 (step S155).

Next, the central processing unit 214 determines whether the user has performed an end operation to end the measurement (step S160). If it is determined that the end operation has not been performed (NO in step S160), the process returns to step S115. On the other hand, if it is determined that the end operation has been performed (YES in step S160), the process moves to end, and the series of processes in the mobile information terminal 30 ends.

As described above, in the first embodiment, the coefficients Cin, Cout, and Crol for calculating BPFI, BPFO, and BSF are divided into a plurality of constants Ca to Cd and stored in the DB unit 208. Then, when vibration analysis is executed, constants Ca to Cd are read out from the DB unit 208, coefficients Cin, Cout, and Crol are restored, and BPFI, BPFO, and BSF are calculated using the restored coefficients Cin, Cout, and Crol. be done. As a result, even if the data (constants Ca to Cd) stored in the DB section 208 leaks to the outside of the mobile information terminal 30, the specifications of the bearing that can be measured by the vibration measurement system 10 will be elucidated. It can be prevented. Therefore, according to the first embodiment, leakage of bearing specification data can be prevented.

Furthermore, according to the first embodiment, since the measuring device 20 and the mobile information terminal 30 communicate wirelessly, the user only needs to install the measuring device 20 on the measurement target to enable wireless communication. Vibration analysis results can be checked anywhere within a certain range.

[Embodiment 2]
In the first embodiment, each of the coefficients Cin, Cout, and Crol used to calculate BPFI, BPFO, and BSF is divided into a plurality of constants Ca to Cd and stored in the DB section 208. In form 2, the specification data of the rolling bearing 15 to be measured (the pitch circle diameter D of the bearing, the diameter d of the rolling elements, the contact angle α of the rolling elements, the number Z of the rolling elements, etc.) is encrypted and stored in the DB section. 208. Then, at the time of measurement, the encrypted specification data is read out from the DB section 208 and decrypted, and the BPFI, BPFO, and BSF are calculated.

The overall configuration of the vibration measurement system according to this second embodiment is the same as that of the first embodiment shown in FIGS. 1 to 3.

FIG. 8 is a diagram showing the configuration of mobile information terminal 30 in the second embodiment. Referring to FIG. 8, mobile information terminal 30 according to the second embodiment is the same as mobile information terminal 30 according to the first embodiment shown in FIG. 3, further including a cryptographic processing unit 216.

In the second embodiment, for various bearings whose vibrations can be measured by the vibration measurement system 10, specification data encrypted according to a predetermined encryption method is stored in the DB section 208 in association with the bearing model number. The encryption method may be a common key encryption method or a public key encryption method. Further, the encryption may be performed using the same key cipher for various specifications, or may be performed using a different key cipher for each specification. Various known methods can be used as the encryption method.

Then, according to instructions from the central processing unit 214, the cryptographic processing unit 216 reads specification data (encrypted data) corresponding to the bearing model number set by the setting unit 202 from the DB unit 208, and performs key encryption according to the cryptographic method. is used to decode the read specification data.

The central processing unit 214 calculates the BPFI from the specification data decrypted by the encryption processing unit 216 and the rotation speed (or rotation frequency) set by the setting unit 202 using the above equations (1) to (3). , BPFO, and BSF are calculated. The processing of the central processing unit 214 after calculating BPFI, BPFO, and BSF is the same as in the first embodiment.

FIG. 9 is a flowchart illustrating an example of a processing procedure in the mobile information terminal 30 according to the second embodiment. Referring to FIG. 3 together with FIG. 9, also in the second embodiment, application software for performing vibration measurement using measuring instrument 20 is started on mobile information terminal 30, and the application software instructs to start measurement. Then, the central processing unit 214 executes a predetermined initialization process (step S210). Thereafter, the setting unit 202 sets the bearing model number of the rolling bearing 15 to be measured, the rotational speed (or rotational frequency) at the time of measurement, the determination reference value for determining the vibration state based on the measurement data, etc. Step S215). The processing executed in steps S210 and S215 is the same as the processing executed in steps S110 and S115 in FIG.

Next, the bearing specification data (encrypted data) corresponding to the set bearing model number is read out from the DB unit 208, and is encrypted by the cryptographic processing unit 216 using a key encryption according to a predetermined encryption method. Specification data is decoded (step S220).

Then, the central processing unit 214 uses the above equations (1) to (3) from the decoded specification data and the rotational frequency calculated from the rotational speed set in step S215 to BPFI, BPFO, and BSF of a certain rolling bearing 15 are calculated (step S222).

When BPFI, BPFO, and BSF are calculated in step S222, the process moves to step S225. The processing in steps S225 to S255 is the same as the processing in steps S125 to S155 in FIG. 7, respectively, so the description will not be repeated.

When the display unit 212 displays the information in step S255, the central processing unit 214 determines whether the user has performed an end operation to end the measurement (step S260). If it is determined that the end operation has not been performed (NO in step S260), the process returns to step S215. On the other hand, if it is determined that the end operation has been performed (YES in step S260), the process moves to end, and the series of processes in the mobile information terminal 30 ends.

As described above, in the second embodiment, the specification data of the rolling bearing 15 to be measured is encrypted and stored in the DB section 208. Then, when vibration analysis is executed, the encrypted specification data is read out from the DB unit 208 and decrypted, and the BPFI, BPFO, and BSF are calculated using the decrypted specification data. As a result, even if the data (encrypted specification data) stored in the DB section 208 is leaked to the outside of the mobile information terminal 30, the specifications of the bearing that can be measured by the vibration measurement system 10 will be clarified. It is possible to prevent this from occurring. Therefore, this second embodiment can also prevent leakage of bearing specification data.

Also, according to the second embodiment, since communication is performed wirelessly between the measuring device 20 and the mobile information terminal 30, the user only needs to install the measuring device 20 on the measurement target to enable wireless communication. Vibration analysis results can be checked anywhere within the range.

In the second embodiment described above, it is assumed that the specification data of the measurement target is encrypted and stored in the DB unit 208, but the coefficients Cin, Cout, Crol for calculating BPFI, BPFO, and BSF are may be encrypted and stored in the DB section 208, or a plurality of constants Ca to Cd obtained by dividing the coefficients Cin, Cout, and Crol described in the first embodiment may be encrypted and stored in the DB section 208. good.

Further, in the first embodiment described above, a plurality of constants Ca to Cd may be stored in the DB unit 208 in binary format. This also makes it possible to prevent the specifications of the bearing that can be measured by the vibration measurement system 10 from being revealed even if the data stored in the DB section 208 leaks to the outside of the mobile information terminal 30.

Furthermore, in the second embodiment described above, the specification data in binary format may be encrypted and stored in the DB unit 208. Alternatively, the coefficients Cin, Cout, and Crol in binary format or the plurality of constants Ca to Cd in binary format may be encrypted and stored in the DB unit 208.

In each of the above embodiments, it is assumed that the measuring device 20 and the mobile information terminal 30 communicate wirelessly, but as shown in FIG. The measurement device 20 and the portable information terminal 30 may be connected through a communication line 40 and communicate with each other through the communication line 40 .

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

10 Vibration measurement system, 15 Measurement object (rolling bearing), 20 Measuring instrument, 30 Personal digital assistant, 40 Communication line, 102 Acceleration sensor, 104 Anti-aliasing filter, 106 A/D converter, 108 Microcomputer, 110 Memory, 112 Communication module, 202 setting section, 204 communication section, 206 analysis section, 208 DB section, 210 judgment section, 212 display section, 214 central processing section, 216 encryption processing section, 310 to 330 input section.

Claims (6)

A vibration analysis device that performs vibration analysis by receiving measurement data from a measuring device that measures the vibration of a rotating body that is a measurement target,
a database unit that divides and stores a coefficient of the rotational frequency of the rotating body into a plurality of constants for calculating a damage frequency that indicates a frequency of vibration that periodically occurs depending on a damaged part of the rotating body;
A vibration analysis device comprising: a processing unit that reads the plurality of constants from the database unit, restores the coefficients, and calculates the damage frequency using the restored coefficients when performing vibration analysis. The database unit stores encrypted data obtained by encrypting the plurality of constants,
The processing unit includes:
reading and decrypting the encrypted data from the database section;
The vibration analysis device according to claim 1, wherein the coefficient is restored from the plurality of decoded constants. The vibration analysis device according to claim 1, wherein the database section stores the plurality of constants in a binary format. The vibration analysis device according to any one of claims 1 to 3 , wherein the rotating body is a bearing. The vibration analysis device according to any one of claims 1 to 4 , further comprising a communication unit that performs wireless communication with the measuring device. A measuring device that measures the vibration of a rotating body to be measured;
A vibration measurement system comprising: a vibration analysis device according to any one of claims 1 to 5, which receives measurement data from the measuring device and performs vibration analysis.

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