Method and device for calculating rotation speed and analyzing defect by using vibration acceleration

Abstract

The present invention relates to a method and an apparatus for calculating a rotational speed and analyzing a defect using a vibration acceleration, the method comprising: an acceleration measurement in which an acceleration sensor measures the vibration of a rotating body; a frequency range setting unit that sets a frequency range for rotational speed detection; a rotation speed frequency is determined, and in the set frequency range, the rotation speed detection algorithm determines the frequency value with the maximum amplitude input as the rotation speed frequency; calculating a rotational speed, and calculating the rotational speed of the rotating body by reflecting a characteristic value of the rotating body on the basis of the rotational speed frequency; frequency analysis: performing frequency analysis corresponding to the rotation speed; and fault analysis: performing rotator fault analysis based on the frequency analysis result. The rotating speed of the rotating body is calculated by using the signal of the installed vibration acceleration sensor, and the defect frequency of the rotating body is calculated by using the rotating speed, so that the rotating speed sensor does not need to be installed.

Description

Technical Field

[0001] The present invention relates to the field of defect frequency analysis, and in particular to a method and a device for calculating rotation speed and analyzing defects by using vibration acceleration. Background Art

[0002] Traditional fault prediction systems usually rely on information from multi-sensor fusion, which includes not only vibration sensors but may also require the installation of additional speed sensors to monitor the speed of the rotating body.

[0003] Patent Publication (Announcement) No. KR101829134B1 describes a system and method for predicting rotating body failures using vibration, characterized in that it includes: a storage unit, which stores cumulative time-domain vibration data accumulated and stored based on a period, cumulative frequency-domain vibration data based on each frequency period included in the cumulative time-domain data based on the period, and cumulative entropy data based on the period of the cumulative frequency-domain vibration data; a vibration measuring unit, which is connected to the rotating body, measures the vibration occurring when the rotating body rotates, and outputs the time-domain vibration data based on the period; and a control unit, which accumulates and stores the time-domain vibration data measured by the vibration measuring unit in the storage unit, and after converting the time-domain vibration data measured by the vibration measuring unit into frequency-domain vibration data of at least one frequency, accumulates the converted frequency-domain vibration data of different frequencies and stores them in the storage unit, generates entropy of the cumulative frequency-domain vibration data of different frequencies and updates the corresponding cumulative entropy data of the storage unit, and determines whether the updated cumulative entropy data is reduced. If reduced, the possibility of failure of the rotating body is determined based on whether it is reduced to less than a reference value.

[0004] This approach brings about problems such as increased costs, increased system complexity, and increased maintenance workload. Summary of the invention

[0005] The present invention aims to provide a method and device for calculating rotational speed and analyzing defects using vibration acceleration, using the signal of an installed vibration acceleration sensor to calculate the rotational speed of a rotating body, and using it to calculate the defect frequency of the rotating body, thereby having the advantage of not needing to install a rotational speed sensor compared to the original system.

[0006] The method of calculating the rotation speed and analyzing defects by using vibration acceleration of the present invention comprises:

[0007] S10 acceleration measurement, using an acceleration sensor to measure the vibration of a rotating body;

[0008] S20 frequency range setting, set the frequency range for rotation speed detection;

[0009] S30: determining the rotation speed frequency, determining the frequency value with the largest amplitude input within the set frequency search range as the rotation speed frequency, wherein the rotation speed detection algorithm is a single audio algorithm;

[0010] S40: calculating the rotation speed, based on the rotation speed frequency, reflecting the characteristic value of the rotating body and calculating the rotation speed of the rotating body;

[0011] S50 frequency analysis, based on the rotation speed of the rotating body, performing frequency analysis corresponding to the rotation speed;

[0012] S60 is a fault analysis, in which a rotating body fault analysis is performed based on the frequency analysis result.

[0013] The device for calculating the rotation speed and analyzing defects by using vibration acceleration of the present invention comprises:

[0014] an acceleration sensor that measures the vibration of a rotating body;

[0015] a frequency range setting unit, the frequency range setting unit setting a frequency range for rotation speed detection;

[0016] A rotation speed detection algorithm, wherein the rotation speed detection algorithm determines a frequency value with a maximum amplitude input within a set frequency range as a rotation speed frequency;

[0017] a rotation speed calculation unit that calculates the rotation speed of the rotating body by reflecting the characteristic value of the rotating body based on the rotation speed frequency;

[0018] a frequency analysis unit that performs frequency analysis corresponding to the rotation speed based on the rotation speed of the rotating body;

[0019] A failure analysis unit is provided for performing a rotation body failure analysis based on the frequency analysis result.

[0020] Compared with the prior art, the present invention has the following advantages: the rotation speed is calculated using the vibration acceleration signal, and the defect frequency is analyzed using the rotation speed. Instead of using a "rotation speed sensor (RPM sensor)", the rotation frequency is obtained from the vibration signal, and vibration analysis and fault analysis of the rotation speed of the rotating body are performed based on this. According to the present invention, the signal of the installed vibration acceleration sensor is used to calculate and extract the rotation speed of the rotating body, and the rotation speed is used to calculate the defect frequency of the rotating body, thereby having the advantage of not needing to install a rotation speed sensor compared to the original system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 (a, b) are respectively a flow chart of calculating rotation speed using vibration acceleration and a diagram of a device for calculating rotation speed and analyzing defects using vibration acceleration according to an embodiment of the present invention;

[0022] Figure 2 A flowchart of specific steps for calculating rotation speed and analyzing defects using vibration acceleration according to an embodiment of the present invention;

[0023] Figure 3 A conceptual diagram illustrating the use of vibration acceleration to calculate rotation speed according to an embodiment of the present invention;

[0024] Figure 4 A detailed diagram of a process of calculating a rotation speed using vibration acceleration according to an embodiment of the present invention;

[0025] Reference numerals

[0026] 10: Acceleration sensor

[0027] 20: Frequency range setting section

[0028] 30: Rotation speed detection algorithm

[0029] 40: Rotation speed calculation unit

[0030] 50: Frequency Analysis Department

[0031] 60: Fault Analysis Department DETAILED DESCRIPTION

[0032] A method and device for calculating rotation speed and analyzing defects using vibration acceleration according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] As shown in Figure 1(a, b) and Figure 2 , Figure 4 As shown, a method for calculating rotation speed and analyzing defects using vibration acceleration according to an embodiment of the present invention includes: an acceleration measurement step S10, a frequency range setting step S20, a rotation speed frequency determination step S30, a rotation speed 1X calculation step S40, a frequency analysis step S50, and a fault analysis step S60.

[0034] As shown in the figure, first, in the acceleration measurement step S10 , the acceleration sensor 10 measures the vibration of the rotating body.

[0035] Next, in the frequency range setting step S20 , the frequency range setting unit 20 sets a frequency range for rotation speed detection.

[0036] Next, in the rotation speed frequency determination step S30, the rotation speed detection algorithm 30 (single tone algorithm) determines the frequency value with the maximum amplitude input within the set frequency search range as the rotation speed frequency 1F.

[0037] In step S40 of calculating the rotation speed 1X, the rotation speed calculation unit 40 reflects the rotation body characteristic value based on the rotation speed frequency 1F and outputs the rotation speed 1X of the rotation body.

[0038] In the frequency analysis step S50 , the frequency analysis unit 50 performs frequency analysis corresponding to the rotation speed based on the rotation speed 1X of the rotating body.

[0039] In the failure analysis step S60 , the failure analysis unit 60 performs a rotating body failure analysis based on the frequency analysis result.

[0040] like Figure 3 , Figure 4 As shown, the Single Tone algorithm is used to calculate the rotation speed from the vibration acceleration signal.

[0041] Figure 3 This is a conceptual diagram of calculating the rotation speed using a vibration acceleration signal according to an embodiment of the present invention. The Single Tone algorithm uses the vibration signal of the rotating body to input a larger feature at a rotation speed of 1X. In the vibration signal, with the reference frequency as the center, the frequency value with the largest amplitude input within the search range is set as the 1X frequency.

[0042] The present invention has been described with respect to the preferred embodiments mentioned above, but the scope of the present invention is not limited to such embodiments. The scope of the present invention is determined according to the following claims and may include various modifications and variations that are within the scope equivalent to the present invention.

[0043] It should be pointed out that the figure marks recorded in the following claims are merely used to assist the understanding of the invention and do not affect the interpretation of the scope of rights. The scope of rights shall not be narrowed based on the recorded figure marks.

Claims

1. A method for calculating rotation speed and analyzing defects using vibration acceleration, characterized in that: include: S10 acceleration measurement, using an acceleration sensor 10 to measure the vibration of a rotating body; S20 frequency range setting, set the frequency range for rotation speed detection; S30: determining the rotation speed frequency, determining the frequency value with the largest amplitude input within the set frequency search range as the rotation speed frequency 1F, wherein the rotation speed detection algorithm 30 is a single audio algorithm; S40: calculating the rotation speed, based on the rotation speed frequency 1F, reflecting the characteristic value of the rotating body and calculating the rotation speed 1X of the rotating body; S50 frequency analysis, based on the rotation speed 1X of the rotating body, performing frequency analysis corresponding to the rotation speed; S60 is a fault analysis, in which a rotating body fault analysis is performed based on the frequency analysis result.

2. A device for calculating rotation speed and analyzing defects using vibration acceleration, characterized in that: include: An acceleration sensor 10, wherein the acceleration sensor 10 measures the vibration of the rotating body; A frequency range setting unit 20, wherein the frequency range setting unit 20 sets a frequency range for rotation speed detection; A rotation speed detection algorithm 30, wherein the rotation speed detection algorithm 30 determines the frequency value with the largest amplitude input within the set frequency range as the rotation speed frequency 1F; a rotation speed calculation unit 40 for calculating a rotation speed 1X of the rotating body by reflecting the characteristic value of the rotating body based on the rotation speed frequency 1F; a frequency analysis unit 50 for performing frequency analysis corresponding to the rotation speed based on the rotation speed 1X of the rotating body; The fault analysis unit 60 performs a rotating body fault analysis based on the frequency analysis result.

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