Method for measuring rotating speed signal frequency of power turbine of ship gas turbine

A technology for power turbines and gas turbines, applied to machines/engines, devices using electric/magnetic methods, mechanical equipment, etc., can solve the problems of unable to meet the requirements of gas turbine power turbine speed measurement, narrow frequency measurement range, low frequency measurement accuracy, etc. question

Pending Publication Date: 2021-07-23
中国船舶重工集团公司第七0三研究所
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Problems solved by technology

At present, the common speed signal frequency measurement device has low frequency measurement accuracy and narrow frequenc...

Method used

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  • Method for measuring rotating speed signal frequency of power turbine of ship gas turbine
  • Method for measuring rotating speed signal frequency of power turbine of ship gas turbine

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Embodiment Construction

[0012] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0013] combine Figure 1-2 , The principle of frequency measurement is to measure the number of signals within N clock cycles, so as to calculate the frequency of the signal. The hardware circuit of the frequency measurement device is composed of a power conversion circuit, a shaping circuit, a digital output circuit, a digital input circuit, and an isolation circuit. The structural block diagram is as follows: figure 1 .

[0014] The present invention measures the frequency of the rotational speed signal. When the rotational speed signal of the power turbine is input to the frequency measuring device through the rotational speed sensor, due to various electromagnetic interferences in the working environment, the measured rotational speed signal (sine wave signal) input to the frequency measuring device will be overwhelmed. If there is an interference signal, th...

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Abstract

The invention aims to provide a ship gas turbine power turbine rotating speed signal frequency measuring method, which comprises the following steps of: receiving an engine rotating speed measured signal, filtering the signal after the measured signal is input, comparing the filtered signal with a set threshold voltage through a voltage comparator, outputting to obtain a square wave signal with the same frequency, sending the square wave signal to an FPGA through an isolation circuit, and allowing the FPGA to count the input square wave signal in unit time, and with the known unit time, calculating the frequency of the measured signal, wherein the calculation formula is f = D * F/N, D is the known set unit number, F is the clock frequency of the FPGA, and N is the number of sampling signals. The method overcomes the defects of an existing device for measuring the rotating speed signal frequency of the power turbine of the ship gas turbine, and is high in frequency measurement precision and wide in frequency measurement range.

Description

technical field [0001] The invention relates to a frequency measurement method, in particular to a frequency measurement method of a rotational speed signal. Background technique [0002] The speed of power turbine of marine gas turbine is one of the key parameters reflecting the performance of gas turbine. How to effectively and accurately measure the speed of power turbine is a research hotspot in the field of measurement and control technology. At present, the common frequency measurement devices for rotational speed signals have low frequency measurement accuracy and narrow frequency measurement range. It cannot meet the speed measurement requirements of the gas turbine power turbine in the case of sudden load changes. Contents of the invention [0003] The purpose of the present invention is to provide a method for measuring the frequency of the rotating speed signal of a marine gas turbine power turbine with high frequency measurement accuracy and wide frequency mea...

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Application Information

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IPC IPC(8): G01P3/48F01D21/00
CPCG01P3/48F01D21/003
Inventor 闫昌盛徐广野杨健张磊马亮马森白若忱张震宇邹斐王元龙
Owner 中国船舶重工集团公司第七0三研究所
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