Method for temperature calibration of blade strain gauges and wind turbine rotor blade containing strain gauges
a temperature calibration and strain gauge technology, applied in the field of wind turbines, can solve the problems of increasing the load on almost all parts of the wind turbine, and fatigue failure of the rotor blad
Inactive Publication Date: 2011-06-09
GENERAL ELECTRIC CO
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Benefits of technology
"The patent text describes a method for calibrating a strain sensor on a wind turbine blade by measuring the bending moments of the blade at different temperatures. By compensating for the temperature dependency of the strain sensor, the method ensures accurate measurements even when the blade is exposed to different temperatures. This helps to improve the accuracy and reliability of the strain sensor, which is important for ensuring the safe and efficient operation of wind turbines."
Problems solved by technology
This increases the loads on almost all parts of a wind turbine, especially the rotor blades which are typically produced from light weight materials, like glass or carbon fibers.
Excessive loads will result in fatigue failures of the rotor blades.
Typically, fatigue failures will occur at a well-defined stress within the material of the rotor blades.
Method used
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[0023]Reference will now be made in detail to the various embodiments, one or more examples of which are illustrated in each figure. Each example is provided by way of explanation and is not meant as a limitation. For example, features illustrated or described as part of one embodiment can be used on or in conjunction with other embodiments to yield yet further embodiments. It is intended that the present disclosure includes such modifications and variations.
[0024]FIG. 1 is a schematic side view of a wind turbine 100. The wind turbine 100 includes three rotor blades 110 but may have more or less blades 110 according to other embodiments. The rotor blades 110 are mounted on a rotor huh 120 which is connected to a nacelle 130. Nacelle 130 is fixed on top of a tower 140. Rotor blades 110 include strain sensors which are adapted to measure bending moments of rotor blades 110.
[0025]The rotor blades of a wind turbine are subject to considerable forces and moments due to wind load, gravita...
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A method for temperature calibration of a strain sensor for a rotor blade of a wind turbine is provided, the method including operating the wind turbine in a mode in which substantially no bending of the rotor blade due to wind occurs, repeatedly measuring gravitationally induced bending moments of the rotor blade for a plurality of temperatures measured at the place of the strain sensor, determining a temperature dependency of the strain sensor on the temperature, calibrating the strain sensor based on the determined temperature dependency of the strain sensor such that the temperature dependency of the strain sensor is compensated.
Description
BACKGROUND OF THE INVENTION[0001]The present disclosure relates to wind turbines. Particularly, the present disclosure relates to a wind turbine rotor blade which is adapted to perform a temperature calibration of a strain sensor and methods for temperature calibration of a strain sensor arranged at a rotor blade of a wind turbine.[0002]Although horizontal axis wind turbines are well-established these days, there is still considerable engineering effort going on to further improve their overall efficiency, power generating capability, and robustness.[0003]Modern wind turbines are designed to produce a maximum amount of energy in a particular geographical area. Therefore, wind turbines are operated such that the operational wind speed range is increased. This increases the loads on almost all parts of a wind turbine, especially the rotor blades which are typically produced from light weight materials, like glass or carbon fibers. Excessive loads will result in fatigue failures of the...
Claims
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IPC IPC(8): F01D25/00
CPCF03D11/0091F05B2260/83F05B2270/303F05B2270/328F05B2270/802G01M5/0083Y02E10/721Y02E10/722G01L1/2218G01L1/2281G01M5/0016F05B2270/808F03D17/00Y02E10/72
Inventor THULKE, MATTHIASHONEKAMP, THORSTENASCHERMANN, RENE
Owner GENERAL ELECTRIC CO