Method for realizing order analysis of rotating machinery

A technology of order analysis and implementation method, applied in the field of signal processing, can solve problems such as high difficulty, high cost of frequency multiplier, and reduced system reliability, so as to reduce production cost, reduce cost and installation difficulty, and improve reliability effect

Inactive Publication Date: 2011-09-07
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

However, for industrial sites, the disadvantage of the frequency multiplier method is that: because the general operating environment of the equipment site is relatively harsh, the additional installation of a frequency multiplier will greatly reduce the reliability of the system; the installation of a frequency multiplier requires construction on the industrial site, The difficulty is relatively large; the investment in the frequency multiplier is not a small cost
At the same time, many rotating equipment have two parts, a high-speed shaft and a low-speed shaft. Generally, only one of the speed sensors is used. If order analysis is to be performed, a speed signal must be provided. According to the traditional method, the equipment must be modified and the sensor must be installed. Greatly increased the difficulty of system installation
[0004] After searching the existing technologies, it was found that such as the document "Rolling Bearing Fault Diagnosis Method Based on Order Inverse Bispectral Analysis", Journal of North University of China (Natural Science Edition), published on October 15, 2008, in which the calculation order The secondary tracking method realizes the fault diagnosis of rolling bearings. However, its implementation still needs the speed pulse as a reference. When there are two kinds of high-speed shafts and low-speed shafts, and one of the shafts does not contain a speed sensor, this order analysis cannot be used. Resampling Method for Fault Diagnosis

Method used

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  • Method for realizing order analysis of rotating machinery
  • Method for realizing order analysis of rotating machinery
  • Method for realizing order analysis of rotating machinery

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Embodiment 1

[0023] Such as figure 1 As shown, this embodiment includes the following steps:

[0024] 1) Round the transmission ratio m (one is not an integer, such as 3.24) to get n.

[0025] 2) Acquire the number of n pulses on the existing high-speed axis.

[0026] 3) Calculate the time interval between n pulse numbers (ΔT 1 ΔT 2 . . . ΔT n ).

[0027] 4) Calculate the pulse interval ΔT of the low-speed shaft according to the following formula, ΔT = m × Δ T 1 + Δ T 2 + · · · + Δ T n n

[0028] 5) Generate a new low-speed shaft pulse according to the ΔT obtained from the above calculation.

[0029] 6) According to the obtained analog pulse a...

Embodiment 2

[0032] This method is applied to the on-site work equipment of a high-line finishing mill in a steel plant in Tangshan. The on-site transmission gearbox is divided into three stages, and the transmission ratios are 5.16 and 2.54 respectively. Since the speed sensor is only installed on the shaft end of the motor, the other part of the gearbox The two output shaft ends are not equipped with rotational speed sensors, and n and m obtained by the order analysis technology proposed by the present invention are respectively 5.16, 2.54 and 5, 2. If there is no technology provided by the present invention, the gearbox can only be processed Reinstalling the sensor greatly increases the cost, and the application of the present invention still completes the task of order analysis without modification.

Embodiment 3

[0034] The deceleration gearbox in a precision forging workshop of a forging steel plant in Fushun monitors its state. According to the new technology of order analysis provided by the present invention, only a speed sensor needs to be installed at the motor end, and the transmission ratio of the gearbox is 4.56, and n is obtained. m are 4.56 and 4 respectively, according to this parameter and the speed pulse at the motor end, the analog pulse at the output end can be generated, and finally the order analysis of the gearbox can be realized.

[0035] Aiming at the shortcomings of relying too much on the rotational speed pulse in the implementation process of traditional order analysis, the present invention proposes an order analysis technology based on analog pulses. This technology can not only perform order analysis on equipment well, but also does not require Both ends are equipped with speed sensors, which reduces the cost.

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Abstract

The invention discloses a method for realizing order analysis of rotating machinery, belonging to the technical field of signal processing. The method comprises the following steps of: extracting a vibration signal and a rotation speed signal of equipment by using a vibration acceleration sensor; performing anti-aliasing filtering by using an anti-aliasing filter; generating a digital signal by using a data acquisition card; generating an analog pulse by using a transmission ratio parameter and performing equal-angle resampling on the vibration signal; and realizing order analysis through spectrum conversion. By adopting the method, the defect of the need of additionally arranging a rotating speed signal sensor on an enterprise field for realizing order analysis is overcome. The method plays an important role in improving the technology of the conventional equipment.

Description

technical field [0001] The invention relates to a method in the technical field of signal processing, in particular to a method for implementing order analysis of rotating machinery. Background technique [0002] In the fields of iron and steel, petrochemical and other fields, high-speed, high-strength large-scale rotating machinery is the key equipment of enterprises. If accidents or sudden failures occur in such key equipment, it will not only affect the production efficiency of enterprises, cause economic losses, but also greatly increase the maintenance of enterprises. cost, and even casualties in severe cases. Therefore, it is particularly important to carry out condition monitoring and fault diagnosis on such equipment. [0003] With the continuous advancement of science and technology, equipment is also changing with each passing day. For large rotating machinery, more and more frequency conversion equipment has appeared, and its operating frequency will continue to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01H17/00
Inventor 陈进从飞云董广明周徐宁明阳周宇陶少飞王冉
Owner SHANGHAI JIAO TONG UNIV
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