Method for realizing high-precision real-time measurement for rotating speed signals
A real-time measurement and rotational speed signal technology, which is applied to devices using electrical/magnetic methods, etc., can solve the problems of inaccurate real-time measurement of aircraft engine rotational speed signals, and achieve the effect of alleviating insufficient data volume and ensuring the update rate.
Inactive Publication Date: 2017-09-29
SICHUAN XINCHUAN AVIATION INSTR
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[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and the purpose is to provide a method for realizing high-precision real-time measurement of the rotational speed signal, so as to solve the problem of inaccurate real-time measurement of the rotational speed signal of the existing aircraft engine
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[0021] Such as Figure 1-7 As shown, the present invention is a method for realizing the high-precision real-time measurement of the rotational speed signal. The rotational speed information of the engine is transmitted through the sensor to measure the rotational speed. Each phase of the AC signal is converted into a square wave signal. Firstly, two phases of each phase signal are ANDed, and the resulting signal is ORed to obtain a square wave signal with three times the frequency of the original signal. The operation expression is (A·B)+(C·B)+(A·C), where A, B and C refer to three-phase square wave signals respectively.
[0022] Argument plan one
[0023] By studying the speed sensor, it is found that the three-phase AC signal output by the sensor has a phase difference of 120°, such as figure 1 As shown, through the observation of the waveform diagram, it can be found that the frequency of the fundamental frequency of the AC component of the synthetic AC voltage of the th...
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The invention discloses a method for realizing high-precision real-time measurement for rotating speed signals, which is characterized in that rotating speed measurement is performed on engine rotating speed information through transmission of a sensor, the sensor transmits through three-phase signals, a pairwise intersecting part of the three-phase signals form a phase difference, alternating-current signals of each phase are converted into square-wave signals, a pairwise AND operation is performed on the signals of each phase, an OR-operation is performed on the signals acquired after the AND operation is carried out, and square-wave signals with the frequency being three times of that of the original signals are acquired. The method overcomes a problem that the phases of the sensor are difference in output amplitude, and signal frequency doubling is also successfully realized. Characteristics of the sensor itself are utilized, and time delay is not caused for signal measurement. GZT-2A rotating speed senor signals are taken as an example, 30 pieces of data can be acquired at 70% of the rotating speed, and more than 10 pieces of data can be acquired above 30% of the rotating speed. Therefore, a problem of insufficient data volume of software processing can be relieved, and data is enabled to more stably meet high-precision utilization requirements under the condition of ensuring the updating rate.
Description
technical field [0001] The invention relates to the field of aircraft engine rotational speed measurement, in particular to a method for realizing high-precision real-time measurement of rotational speed signals. Background technique [0002] The converters that convert the engine speed signal into digital signals meet the technical requirements under the standard speed conditions in the laboratory (the general error is 0.5%), but data jumps will occur after installation. The speed error requirement on the aircraft is 0.3%, and the requirement for data stability is higher. [0003] Through the flight parameter data analysis provided by the main engine and the summary after troubleshooting in the field, it has been confirmed that the main reasons for the instability of the on-board speed data are: 1. The speed signal is interfered by the environment of the whole machine. 2. At low speed, the rotor of the speed sensor rotates unevenly, causing the output signal to be unstable...
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CPCG01P3/44
Inventor 陈伟黄龙伟
Owner SICHUAN XINCHUAN AVIATION INSTR