WO2003029750A1 - Sensor construction for measuring the bending of a construction element - Google Patents

Sensor construction for measuring the bending of a construction element Download PDF

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Publication number
WO2003029750A1
WO2003029750A1 PCT/DK2001/000631 DK0100631W WO03029750A1 WO 2003029750 A1 WO2003029750 A1 WO 2003029750A1 DK 0100631 W DK0100631 W DK 0100631W WO 03029750 A1 WO03029750 A1 WO 03029750A1
Authority
WO
WIPO (PCT)
Prior art keywords
construction
rod element
accordance
sensor
rod
Prior art date
Application number
PCT/DK2001/000631
Other languages
French (fr)
Inventor
Henrik Abild Jensen
Original Assignee
Vestas Wind Systems A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vestas Wind Systems A/S filed Critical Vestas Wind Systems A/S
Priority to PCT/DK2001/000631 priority Critical patent/WO2003029750A1/en
Publication of WO2003029750A1 publication Critical patent/WO2003029750A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0016—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of aircraft wings or blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/80—Diagnostics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a sensor construction for measuring the bending of a construction element of the kind set forth in the preamble of claim 1.
  • strain gauge constructions of different kinds for measuring the bending of construction elements, such strain gauges being positioned in appropriate places on the surface of the construction element to be measured on.
  • a sensor construction of this kind is e.g. known from WO 01/33179.
  • Figure 1 schematically shows a sensor construction using a linear transducer for the position measurement
  • Figure 2 schematically shows the mounting of a sensor construction in a wind turbine wing
  • Figure 3 schematically shows a cross-section of a wind turbine wing comprising a sensor construction for measuring the bending of the wing flap-wise/edge-wise, and showing the deformation of the wing as a function of position for bending flap-wise and edge-wise, respectively.
  • the sensor construction schematically shown in Figure 1 comprises a rod element 1 firmly connected 7 to the construction element to be measured on (not shown). Close to the opposite end of the rod element 1 , the rod element 1 is guided in its movement by a guiding bearing 2 connected to the construction element to be measured on, said guiding bearing 2 providing a movability in the axial direction of the rod element 1.
  • This end of the rod element is connected to a construction 6 transferring the axial movement of the rod element 1 to a linear transducer, in the example shown comprising a ring-formed magnet 3 movable along a sensor rod 4 connected to an electronic measuring system 5, which is firmly connected to the construction element to be measured on.
  • the electronic measuring system 5 converts the position of the magnet 3 relative to the sensor rod 4 into an electrical output signal indicating said position and accordingly, when the sensor construction is appropriately positioned and fixed in the construction element to be measured on, indicating the bending of said construction element.
  • the length of the rod 1 can be varied and naturally the measuring system for measuring the position of the second end of said rod element could be any suitable linear transducer system for measuring position.
  • the rod element is selected to have the same thermal expansion coefficient as the construction to be measured on.
  • a sensor construction is schematically shown mounted in a wind turbine wing, in which the rod element 1 is kept in a correct position by means of several guiding bearings 2 along the length of the rod element 1.
  • the guiding bearings 2 allow axial movement of the rod element 1 relative to the wind turbine wing.
  • the sensor construction is suitably positioned inside the construction on an inner surface of the hollow construction.
  • any length of rod element can be used, it is evident that in order to increase the movement of the second end of the rod element 1 for a certain bending, the rod element 1 can have a length that is preferably at least half of the overall length of the wind turbine wing to be measured on. This provides the further advantage that possible nodes and anti-nodes corresponding to different vibration modes will have little or no influence on the bending measurement, this naturally partially being dependent on the positioning of the two ends of the rod element 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

A sensor construction for measuring the bending of a construction element (8) comprises a rod element (1) positioned offset relative to the deformation neutral line/surface (n) for the bending (f, e) to be measured, a first end of said rod element (1) being firmly connected (7) to the construction element (8) and a second end of said rod element being connected (2) to the construction element (8), said second end connection providing a movability in the axial direction of the rod element (1), the measurement being performed by measuring (3, 4, 5, 6) the position of the second end of the rod element (1) relative to the construction element (8). In this way, the measurement can be performed by simple measurement of the position of the second end of the rod element (1) relative to the construction element (8).

Description

SENSOR CONSTRUCTION FOR MEASURING THE BENDING OF A CONSTRUCTION ELEMENT
TECHNICAL FIELD
The present invention relates to a sensor construction for measuring the bending of a construction element of the kind set forth in the preamble of claim 1.
BACKGROUND ART
In sensor constructions of this kind it is known to use strain gauge constructions of different kinds for measuring the bending of construction elements, such strain gauges being positioned in appropriate places on the surface of the construction element to be measured on. A sensor construction of this kind is e.g. known from WO 01/33179.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a sensor construction of the kind referred to above, with which it is possible to measure the bending of a construction element over a substantial length of said construction element, and this object is achieved with a sensor construction of said kind, which according to the present invention also comprises the features set forth in the characterizing clause of claim 1. With this arrangement, the bending measurement can be performed over a distance corresponding to the length of the rod element and the measurement can be performed by measuring the position of the second end of the rod element relative to the construction element using suitable position measuring sensors. Preferred embodiments of the invention, the advantages of which will be evident for a man skilled in the art after reading the following detailed part of the present description, are revealed in the subordinate claims. BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed part of the present description, the invention will be explained in more detail with reference to the exemplary embodiments of a sensor construction according to the invention shown in the drawings, in which
Figure 1 schematically shows a sensor construction using a linear transducer for the position measurement,
Figure 2 schematically shows the mounting of a sensor construction in a wind turbine wing, and Figure 3 schematically shows a cross-section of a wind turbine wing comprising a sensor construction for measuring the bending of the wing flap-wise/edge-wise, and showing the deformation of the wing as a function of position for bending flap-wise and edge-wise, respectively.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The sensor construction schematically shown in Figure 1 comprises a rod element 1 firmly connected 7 to the construction element to be measured on (not shown). Close to the opposite end of the rod element 1 , the rod element 1 is guided in its movement by a guiding bearing 2 connected to the construction element to be measured on, said guiding bearing 2 providing a movability in the axial direction of the rod element 1. This end of the rod element is connected to a construction 6 transferring the axial movement of the rod element 1 to a linear transducer, in the example shown comprising a ring-formed magnet 3 movable along a sensor rod 4 connected to an electronic measuring system 5, which is firmly connected to the construction element to be measured on. The electronic measuring system 5 converts the position of the magnet 3 relative to the sensor rod 4 into an electrical output signal indicating said position and accordingly, when the sensor construction is appropriately positioned and fixed in the construction element to be measured on, indicating the bending of said construction element.
Depending on the construction element to be measured on, the length of the rod 1 can be varied and naturally the measuring system for measuring the position of the second end of said rod element could be any suitable linear transducer system for measuring position. In order to reduce temperature-induced influence on the measurements, the rod element is selected to have the same thermal expansion coefficient as the construction to be measured on.
In Figure 2, a sensor construction is schematically shown mounted in a wind turbine wing, in which the rod element 1 is kept in a correct position by means of several guiding bearings 2 along the length of the rod element 1. Naturally the guiding bearings 2 allow axial movement of the rod element 1 relative to the wind turbine wing. Due to the fact that wind turbine wings are normally produced as hollow elements, the sensor construction is suitably positioned inside the construction on an inner surface of the hollow construction. Although any length of rod element can be used, it is evident that in order to increase the movement of the second end of the rod element 1 for a certain bending, the rod element 1 can have a length that is preferably at least half of the overall length of the wind turbine wing to be measured on. This provides the further advantage that possible nodes and anti-nodes corresponding to different vibration modes will have little or no influence on the bending measurement, this naturally partially being dependent on the positioning of the two ends of the rod element 1.

Claims

1. Sensor construction for measuring the bending of a construction element (8), characterized by comprising a rod element (1) positioned offset relative to the deformation neutral line/surface (n) for the bending (f, e) to be measured, a first end of said rod element (1) being firmly connected (7) to the construction element (8) and a second end of said rod element being connected (2) to the construction element (8), said second end connection providing a movability in the axial direction of the rod element (1), the measurement being performed by measuring (3, 4, 5, 6) the position of the second end of the rod element (1) relative to the construction element (8).
2. Sensor construction in accordance with claim 1, ch a racterized by comprising a number of guiding bearings (2) along the length of said rod element (1), said bearings (2) maintaining the rod element (1) positioned relative to the construction element (8) and allowing movement in the axial direction of the rod element (1).
3. Sensor construction in accordance with claim 1, ch a racte rized by comprising a continuous bearing construction along the length of said rod element (1), said bearing construction maintaining the rod element (1) positioned relative to the construction element (8) and allowing movement in the axial direction of the rod element (1).
4. Sensor construction in accordance with claim 1,2 or 3, characterized by comprising a linear transducer (3, 4, 5) for measuring the position of the second end of the rod element (1 ) relative to the construction element (8).
5. Sensor construction in accordance with any of the preceding claims, characte ri ze d by the construction element (8) being a hollow element and the sensor construction being mounted on an inner surface of said hollow construction element (8).
6. Sensor construction in accordance with any of the preceding claims, chara cte ri ze d by the rod element (1) having a length from the first end to the second end which is at least half of the overall length of the construction element (8).
7. Sensor construction in accordance with any of the preceding claims, characterized by the rod element (1) and the construction element (8) having the same thermal expansion co-efficient.
8. Sensor construction in accordance with any of the preceding claims, characterized by the rod element (1 ) and the construction element (8) being of the same material.
9. Sensor construction in accordance with claim 8, characterized by the material of the construction element (8) and the rod element (1) being fibre reinforced plastic material.
10. Sensor construction in accordance with claim 9, c h a r a c t e r i z e d by the fibre orientation being identical in the rod element (1) and the construction element (8).
11. Sensor construction in accordance with any of the preceding claims, characterized by the construction element (8) being a wind turbine wing or a wind turbine tower.
12. Sensor construction in accordance with any of the preceding claims, characterized by being used to measure the bending of a wind turbine wing in the flap-wise (f) or edge-wise (e) direction.
PCT/DK2001/000631 2001-10-02 2001-10-02 Sensor construction for measuring the bending of a construction element WO2003029750A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DK2001/000631 WO2003029750A1 (en) 2001-10-02 2001-10-02 Sensor construction for measuring the bending of a construction element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2001/000631 WO2003029750A1 (en) 2001-10-02 2001-10-02 Sensor construction for measuring the bending of a construction element

Publications (1)

Publication Number Publication Date
WO2003029750A1 true WO2003029750A1 (en) 2003-04-10

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068834A1 (en) * 2004-01-16 2005-07-28 Lm Glasfiber A/S Monitoring the operation of a wind energy plant
WO2008148370A2 (en) * 2007-06-08 2008-12-11 Repower Systems Ag Method and device for the orientation of an angle-adjustable rotor blade of a wind turbine and corresponding wind turbine
EP2037213A1 (en) * 2007-09-12 2009-03-18 Siemens Aktiengesellschaft Method and sensor setup for determination of deflection and/or strain for failure detection
WO2010061290A2 (en) 2008-11-28 2010-06-03 Vestas Wind Systems A/S Monitoring of rotor blade load in a wind turbine
GB2469994A (en) * 2009-04-30 2010-11-10 Dublin Inst Of Technology A wing flex measuring system
GB2478357A (en) * 2010-03-05 2011-09-07 Moog Insensys Ltd Method of monitoring the structural integrity of a wind turbine blade
CN102445339A (en) * 2010-09-30 2012-05-09 通用电气公司 System and method for detecting and controlling rotor blade deflection
WO2018011034A1 (en) * 2016-07-11 2018-01-18 Wobben Properties Gmbh Measuring a torsion angle of a rotor blade
CN107796578A (en) * 2017-10-27 2018-03-13 宝鸡欧亚化工设备制造厂 The detection method of titanium alloy gyroplane frame strength
WO2019038710A1 (en) * 2017-08-24 2019-02-28 Suzlon Energy Ltd. Sensor arrangement for sensing bending moments in an elongate component; elongate component; sensor system and wind turbine
CN113847205A (en) * 2020-06-28 2021-12-28 新疆金风科技股份有限公司 Blade adjusting device, impeller, wind generating set and blade adjusting method thereof
EP4008993A1 (en) 2020-12-04 2022-06-08 Wobben Properties GmbH Method for measuring the strain on a component of a wind power plant, arrangement for strain measurement, use of the arrangement and method for mounting the arrangement

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4312042A (en) * 1979-12-12 1982-01-19 Sundstrand Data Control, Inc. Weight, balance, and tire pressure detection systems
DE3515126A1 (en) * 1985-04-26 1986-10-30 Robert Bosch Gmbh, 7000 Stuttgart Electromechanical dynamometer
US5259252A (en) * 1992-02-19 1993-11-09 Outdoor Electronics, Ltd. Apparatus for measuring forces on a fishing rod
WO1997006405A1 (en) * 1993-02-18 1997-02-20 Rasmussen Robert F Continuous duty press monitoring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4312042A (en) * 1979-12-12 1982-01-19 Sundstrand Data Control, Inc. Weight, balance, and tire pressure detection systems
DE3515126A1 (en) * 1985-04-26 1986-10-30 Robert Bosch Gmbh, 7000 Stuttgart Electromechanical dynamometer
US5259252A (en) * 1992-02-19 1993-11-09 Outdoor Electronics, Ltd. Apparatus for measuring forces on a fishing rod
WO1997006405A1 (en) * 1993-02-18 1997-02-20 Rasmussen Robert F Continuous duty press monitoring system

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068834A1 (en) * 2004-01-16 2005-07-28 Lm Glasfiber A/S Monitoring the operation of a wind energy plant
CN100392238C (en) * 2004-01-16 2008-06-04 Lm玻璃纤维有限公司 Monitoring the operation of a wind energy plant
EP2626553A3 (en) * 2004-01-16 2014-09-17 LM Wind Power A/S Monitoring the operation of a wind energy plant
EP2626553A2 (en) * 2004-01-16 2013-08-14 Lm Glasfiber A/S Monitoring the operation of a wind energy plant
WO2008148370A3 (en) * 2007-06-08 2009-07-30 Repower Systems Ag Method and device for the orientation of an angle-adjustable rotor blade of a wind turbine and corresponding wind turbine
WO2008148370A2 (en) * 2007-06-08 2008-12-11 Repower Systems Ag Method and device for the orientation of an angle-adjustable rotor blade of a wind turbine and corresponding wind turbine
US8075267B2 (en) 2007-09-12 2011-12-13 Siemens Aktiengesellschaft Method and sensor setup for determination of deflection and/or strain for failure detection
US8123480B2 (en) 2007-09-12 2012-02-28 Siemens Aktiengesellschaft Sensor setup for determination of deflection and/or strain
EP2037212A1 (en) * 2007-09-12 2009-03-18 Siemens Aktiengesellschaft Method and sensor setup for determination of deflection and/or strain
EP2037213A1 (en) * 2007-09-12 2009-03-18 Siemens Aktiengesellschaft Method and sensor setup for determination of deflection and/or strain for failure detection
WO2010061290A2 (en) 2008-11-28 2010-06-03 Vestas Wind Systems A/S Monitoring of rotor blade load in a wind turbine
WO2010061290A3 (en) * 2008-11-28 2011-01-20 Vestas Wind Systems A/S Monitoring of rotor blade load in a wind turbine
GB2469994A (en) * 2009-04-30 2010-11-10 Dublin Inst Of Technology A wing flex measuring system
GB2478357A (en) * 2010-03-05 2011-09-07 Moog Insensys Ltd Method of monitoring the structural integrity of a wind turbine blade
GB2478357B (en) * 2010-03-05 2012-02-15 Moog Insensys Ltd Monitoring the structural integrity of a wind turbine blade
CN102445339A (en) * 2010-09-30 2012-05-09 通用电气公司 System and method for detecting and controlling rotor blade deflection
WO2018011034A1 (en) * 2016-07-11 2018-01-18 Wobben Properties Gmbh Measuring a torsion angle of a rotor blade
CN109416295A (en) * 2016-07-11 2019-03-01 乌本产权有限公司 The torsion angular measurement of rotor blade
WO2019038710A1 (en) * 2017-08-24 2019-02-28 Suzlon Energy Ltd. Sensor arrangement for sensing bending moments in an elongate component; elongate component; sensor system and wind turbine
DE112018004704B4 (en) 2017-08-24 2022-01-05 Suzlon Energy Ltd. Sensor arrangement for recording bending moments in an elongated component, elongated component, sensor system and wind turbine
CN107796578A (en) * 2017-10-27 2018-03-13 宝鸡欧亚化工设备制造厂 The detection method of titanium alloy gyroplane frame strength
CN113847205A (en) * 2020-06-28 2021-12-28 新疆金风科技股份有限公司 Blade adjusting device, impeller, wind generating set and blade adjusting method thereof
EP4008993A1 (en) 2020-12-04 2022-06-08 Wobben Properties GmbH Method for measuring the strain on a component of a wind power plant, arrangement for strain measurement, use of the arrangement and method for mounting the arrangement

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