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A Method for Distinguishing Vibration Frequency of Rotary Machinery

A vibration frequency, rotating machinery technology, used in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of high price and no spectrum resolution, and reduce the number and time of downtime, working status and maintenance. The effect of working convenience and improving work efficiency

Active Publication Date: 2017-01-04
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the portable vibration meters used in general factories and mines only have the function of measuring the vibration amplitude, without the function of spectrum resolution.
Dedicated instruments are expensive and require dedicated personnel to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In a power plant, a horizontal centrifugal water pump vibrated beyond the standard.

[0040] The velocity and displacement of the vibration both include the peak-to-peak value of the velocity V P-P , the effective value of speed V rms and the peak-to-peak value of the displacement D P-P , effective value of displacement D rms , in this embodiment, the bearing vibration displacement value D is measured by using the measuring instrument vm63 测量 up to 105μm (take the peak-to-peak value of the displacement D P-P ), and measured the vibration velocity value V at the same measuring point 测量 It is 6.89mm / s (taking the effective value of speed V rms ).

[0041] Measure the actual speed ξ of the water pump to be 1490r / min.

[0042] Calculate the value of the rotational speed equivalent S according to the following formula (6):

[0043] S=27020×V 测量 / D 测量 =1773.03 (6), where V 测量 and D 测量 Represents a numerical value, independent of the unit.

[0044] Calculate the v...

Embodiment 2

[0049] In a thermal power plant, a centrifugal suction fan vibrated beyond the standard.

[0050] Using the measuring instrument vm63, the bearing vibration displacement value D is measured 测量 up to 165μm (take the peak-to-peak value of displacement D P-P ), and measured the vibration velocity value V at the same measuring point 测量 6.28mm / s (taking the effective value of speed V rms ).

[0051] Measure the actual speed ξ of the suction fan to be 990r / min.

[0052] Calculate the value of the rotational speed equivalent S according to the following formula (6):

[0053] S=27020×V 测量 / D 测量 =1028.4 (6), where V 测量 and D 测量 Represents a numerical value, independent of the unit.

[0054] Calculate the value of η using the following formula (7),

[0055] η=S / ξ=1028.4 / 990=1.039 (7).

[0056] η= 1.0391, so it is judged that the vibration belongs to the fundamental frequency. After inspection, the reason for the vibration is that the impeller of the fan has been running for ...

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PUM

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Abstract

The invention relates to a rotary machine vibration frequency discrimination method, which comprises the following steps: vibration speed and displacement are successively measured at a same measuring point of a rotary machine by the utilization of a portable vibrometer, and actual rotary speed xi of the rotary machine equipment is measured; according to S=27020*V measurement / D measurement, the value of speed equivalent S is calculated; by the utilization of eta=S / xi, the value of eta is calculated; according to the value of eta, whether vibration frequency of the rotary machine is low frequency, high frequency or rotational frequency is discriminated; and according to the discrimination result of the vibration frequency, the reason of the vibration fault and the fault position can be traced rapidly and accurately. By the method, it brings great convenience for working condition and repair work of the rotary machine; repair work efficiency of workers is greatly raised; shutdown and work delay frequency and time of the machine set are minimized; and continuity and stability of the whole production are guaranteed.

Description

technical field [0001] The invention relates to a method for distinguishing the vibration frequency of a rotating machine. Background technique [0002] At present, when a vibration fault occurs in a rotating machine, it is necessary to analyze the cause of the fault, and the analysis of the vibration frequency is very important. [0003] In the field of rotating machinery vibration, the definition of vibration frequency is: the vibration frequency is higher than the frequency corresponding to the rotational speed, which is called high-frequency vibration. The frequency corresponding to the vibration frequency lower than the rotational speed is called low frequency vibration. The frequency corresponding to the vibration frequency equal to the rotational speed is called the fundamental frequency vibration. Because the vibration mechanisms of these three frequencies are different, judging which frequency vibration belongs to is extremely critical for accurate fault judgment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 张荣佩牟法海高翔
Owner STATE GRID CORP OF CHINA
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