Magnetic field communication system and method for measuring flutter of turbine blade

Patent metadata

Field	Value
Publication number	US-2018283936-A1
Application number	US-201815942202-A
Country	US
Kind code	A1
Filing date	Mar 30, 2018
Priority date	Apr 4, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

The magnetic field communication system for measuring the flutter of the turbine blade in accordance with an embodiment of the present disclosure includes a sensor module placed on an outer surface of the turbine blade to sense a signal on the flutter of the turbine blade; an interface converting the signal on the flutter sensed by the sensor module into a magnet field signal to transmit it to the outside of a casing surrounding the turbine blade; and an adaptor receiving the magnetic field signal to generate a power source of the system, and analyzing the magnetic field signal to determine the degree of the flutter of the turbine blade.

First claim

What is claimed is:

1 . A magnetic field communication system for measuring flutter of a turbine blade, comprising:
a sensor module placed on an outer surface of the turbine blade to sense a signal on the flutter of the turbine blade; an interface converting the signal on the flutter sensed by the sensor module into a magnetic field signal to transmit it to the outside of a casing surrounding the turbine blade; and an adaptor receiving the magnetic field signal and analyzing the magnetic field signal to determine the degree of the flutter of the turbine blade.

2 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 1 ,
wherein the sensor module comprising: an optical fiber placed on the outer surface of the turbine blade; and at least one sensor connected with the optical fiber.

3 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 2 ,
wherein the optical fiber contacts along the blade direction of the turbine blade, wherein the sensor is provided to the point where one end and the other end of the optical fiber meet, and wherein the sensor senses the change of the wavelength of a signal and the time when the signal transmitted from the sensor again reaches the sensor by the optical fiber by transmitting the signal in one direction of the optical fiber and receiving the transmitted signal.

4 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 3 ,
wherein the sensor is provided in plural along the blade direction of the turbine blade, and the sensors measure the flutter for each section of the outer surface of the turbine blade.

5 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 2 ,
wherein the optical fiber is provided along the length direction in which the turbine blade is extended from a turbine rotor, and wherein the sensor is provided in plural to one end and the other end of the optical fiber, respectively.

6 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 5 ,
wherein the sensors comprise a first sensor provided to one end of the optical fiber, and a second sensor provided to the other end of the optical fiber, and wherein the second sensor receives the signal transmitted by the first sensor to measure the change of the wavelength of the signal and the reach time of the signal.

7 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 1 ,
wherein the interface is placed on the outer surface of the turbine blade.

8 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 1 , wherein the adaptor comprising:
a magnetic field reception unit receiving the magnetic field signal; a control unit analyzing the magnetic field signal to measure the flutter of the turbine blade.

9 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 8 comprises,
a power source unit generating a power source using the magnetic field signal and storing the power source, wherein if the capacity of the power source charged in the power source unit is equal to or greater than a first capacity, the control unit uses the magnetic field signal to measure the flutter of the turbine blade, the first capacity being the capacity that the charging of the power source unit is completed.

10 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 8 ,
wherein if the capacity of the power source charged in the power source unit is equal to or smaller than a second capacity, the control unit uses the magnetic field signal to supply it to the power source unit to generate the power source.

11 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 8 ,
wherein if the capacity of the power source stored in the power source unit after the charging of the power source unit is completed is reduced to be equal to or smaller than a second capacity, the control unit uses the received magnetic field signal to charge the power source unit.

12 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 8 ,
wherein the control unit analyzes the wavelength of the signal on the flutter measured by the sensor module by analyzing the magnetic field signal to compare it with a pre-stored wavelength.

13 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 12 , wherein the control unit
as a result of comparing the wavelength of the signal on the flutter with the pre-stored wavelength, determines the flutter of the turbine blade in the normal range within an error range, and as a result of comparing the wavelength of the signal on the flutter with the pre-stored wavelength, determines the flutter of the turbine blade in the abnormal range if the error range is exceeded.

14 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 8 ,
wherein the control unit analyzes the transmission/reception time of the signal on the flutter measured by the sensor module by analyzing the magnetic field signal to compare it with a pre-stored transmission/reception time.

15 . The magnetic field communication system for measuring the flutter of the turbine blade of claim 14 , wherein the control unit
as a result of comparing the transmission/reception time of the signal on the flutter with the pre-stored transmission/reception time, determines the flutter of the turbine blade in the normal range within an error range, and as a result of comparing the transmission/reception time of the signal on the flutter with the pre-stored transmission/reception time, determines the flutter of the turbine blade in the abnormal range if the error range is exceeded.

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Choi Jong Min
• Son Hyun Woo

Classifications

• G01B11/18 Primary

  using photoelastic elements · CPC title

• G01B2210/58

  Wireless transmission of information between a sensor or probe and a control or evaluation unit · CPC title

• F05B2270/804

  Optical devices · CPC title

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F05D2260/80

  Diagnostics · CPC title