Method and device for measuring rotational speed of rotating equipment

Abstract

The invention discloses a method and device for measuring rotating speeds of a rotating device. The method includes the steps that a line coded disc is additionally arranged on a rotating shaft of the rotating device, when the rotating shaft rotates, infrared rays are emitted by a rotating speed sensor and irradiated on a cursor line of the line coded disc, and then high levels are returned, or else low levels are returned, and an integral pulse of the rotating speed sensor is acquired; the number of sampling data in the pulse is counted, and each sampling datum corresponds to one time point; based on the sampling frequency h of the rotating speed sensor, time spent on one circle of rotation of the rotating shaft is calculated by the combination of the number of the sampling data; according to the time spent on one circle of rotation of the rotating shaft to rotate by one circle, the rotating speeds R in a series of time points are calculated; at least two times of fitting straight line calculation is conducted on the rotating speed in each time point, a fitting straight line is formed, and the real-time rotating speeds are acquired from the fitting straight line. The method and device for measuring the rotating speeds of the rotating device can acquire the real-time rotating speed in any time point at any time, are high in accuracy and anti-interference performance, and can be suitable for the high rotating speed and the low rotating speed.

Description

technical field [0001] The invention relates to a method and device for measuring the rotational speed of rotating equipment capable of obtaining real-time translation at any time point at any time, with high precision, strong anti-interference and adaptable to high and low rotational speeds. Background technique [0002] As one of the basic indicators of mechanical equipment, speed plays a vital role in mechanical function, performance and state analysis. With the increasing degree of automation in the machinery industry, on the one hand, the requirements for the accuracy and fault tolerance of the speed test are higher, and on the other hand, the requirements for the test speed device to cooperate with other test devices are increasing. For example, in the fault diagnosis system of rotating machinery, when analyzing the fault frequency, the frequency error is required to be within the range of 1HZ, that is, the rotational speed is required to be accurate to 0.02 revolution...

AI Technical Summary

Problems solved by technology

[0009] All three existing technologies have irreparable shortcomings

[0010] 1. "M Algorithm": This algorithm is generally recognized to have a large deviation (up to 0.5 revolutions), and the algorithm has poor fault tolerance

Using a counter, the calculated integer is an approximate value rounded to 5, which is far from meeting the needs of high-precision occasions; moreover, this algorithm has extremely low error tolerance, and the ability to automatically correct data after interference is poor; the ability to calculate real-time speed Difference

[0011] 2. "T Algorithm": This algorithm can calculate the current instantaneous speed, but in the implementation process of the algorithm, the time measurement requirements are relatively high, and the fault tolerance needs to be improved. If the test data is disturbed, the test value will have a large deviation

[0012] 3. "M / T Algorithm": This algorithm can test the speed at a certain time point, but there is a deviation in the calculation of the changing speed

[0013] A. If there are multiple data interferences during the test period, just removing the maximum value and minimum value will still cause a large deviation in the test value; and this algorithm still has the problem that the initial closing of the timer is inconsistent with the counting

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