Abstract:
Systems and methods for monitoring components are provided. A component has an exterior surface. A method includes performing a first analysis of a first image of a surface feature configured on the exterior surface of the component, the first image obtained by an imaging device. The method further includes adjusting a viewing parameter of the imaging device when a predetermined first analysis threshold for the first image is unsatisfied, and performing a subsequent first analysis of a second image of the surface feature, the second image obtained by the imaging device. The method further includes adjusting a distance between the imaging device and the surface feature when the predetermined first analysis threshold for the second image is unsatisfied, and performing a second analysis of a third image, the third image obtained by the imaging device.
Abstract:
Die Erfindung betrifft einen Schwingungserreger (10) zur Belastungsprüfung eines Rotorblatts (20), insbesondere eines Rotorblatts (20) einer Großwindkraftanlage, mit einem Direktantrieb, der eine Motorwelle aufweist und über einen Hebelmechanismus (12) mit dem Rotorblatt (20) verbindbar ist, wobei der Hebelmechanismus (12) eine Pendelstütze (14), die mit einer Koppeleinrichtung (15) zur Kraftübertragung auf das Rotorblatt (20) verbunden ist, und einen Hebel (13) aufweist, der mit der Motorwelle drehfest und mit der Pendelstütze (14) gelenkig verbunden ist.
Abstract:
The present invention relates to a method and a system for determining a parameter indicative of blade deflection and/or blade loading. An effective source of electro- magnetic (EM) radiation is arranged to transmit an EM radiation signal and a receiver is arranged to receive the EM radiation signal. The receiver being spaced apart from the effective source in a spanwise direction of the blade. The effective source and receiver being arranged such that deflection of the blade results in a straight-line distance between the effective source and the receiver varying and determining a parameter indicative of blade deflection and/or blade loading on the basis of the irradiance of the EM radiation signal received by the receiver.
Abstract:
Methods for manufacturing strain sensors on turbine components include providing a turbine component comprising an exterior surface, depositing a ceramic material onto a portion of the exterior surface, and ablating at least a portion of the ceramic material to form a strain sensor comprising at least two reference points.
Abstract:
Procédé de détermination en haute fréquence du seuil de non-propagation de fissure par fatigue dans lequel on exerce, sur au moins une éprouvette comportant dans une zone d'épreuve (10A) un trou elliptique (12) ayant à un sommet une entaille (14) et maintenue entre deux masses rigides (24, 26), deux plaques rigides de précontrainte (20, 22) étant disposées de part et d'autre de cette éprouvette et fixées à chacune de leurs deux extrémités (20A, 22A; 20B, 22B) aux deux masses rigides, un chargement cyclique (32, 32A) dont la fréquence est choisie égale à la fréquence propre de l'ensemble éprouvette/masses/plaques de contrainte de façon à générer depuis l'entaille une fissure de fatigue, puis l'arrêt de la propagation de la fissure ayant été constaté, on relève la longueur finale de la fissure et à l'aide d'un abaque on détermine ledit seuil ΔK th de non propagation de fissure par fatigue, le chargement cyclique étant obtenu par un pot vibrant électrodynamique fixé solidairement à l'aide de montants rigides à un bâti supportant les deux masses rigides et comportant une tige de poussée pour transmettre ce chargement cyclique à l'ensemble éprouvette/masses/plaques de contrainte.
Abstract:
The invention relates to a wind turbine comprising a component to be monitored and a crack detection unit. The crack detection unit has at least one thread or fiber (110, 120, 130), which is fastened directly to the component to be monitored. Furthermore, the crack detection unit has a tear detector, which is used to detect whether the thread or fiber is torn or not.
Abstract:
The invention provides a method and system of monitoring bending strain on a wind turbine blade. The method in one aspect comprises:. locating at least three strain sensors on the turbine blade, in use each strain sensor providing a strain measurement, the strain sensors located such that edgewise and flapwise bending can be determined from the strain measurements; calculating a plurality of resultant bending strains using the strain measurements; calculating an average resultant bending strain from the plurality of resultant bending strains; and calculating a confidence value for a first sensor based on a comparison of resultant bending strains derived from the strain measurement from the first sensor with the average resultant bending strain.
Abstract:
The invention provides a method and system of detecting ice or other foreign matter on a wind turbine blade or damage to a wind turbine blade. The method in one aspect comprises: measuring twisting torque on the blade about its longitudinal axis to provide a detected torque signal;comparing a value based on the detected torque signal with a comparison value, the comparison value derived from one or more measured parameters having a predetermined relationship with the twisting torque about the longitudinal axis of the blade when the blade is operating under normal operating conditions; and determining that ice or other foreign matter is on the blade or that the blade is damaged if the value based on the detected torque signal differs from the comparison value by more than a predetermined amount. Wind turbine blades are designed such that any change in the shape of the blade reduces twisting torque on the blades significantly. Torque about the longitudinal axis of the blade can therefore be used as a sensitive indicator of ice on the blade and of damage to the blade.
Abstract:
A component including a surface subject to wear by an electrically conductive wear counterface (50). The component comprises a substrate (10); one or more material layers (32) overlying the substrate (10); a wear surface layer (16) overlying the one or more material layers (32); a first pair of spaced apart and electrically open wear sensor conductors (12/14) disposed in the substrate (10), in the one or more material layers (32), or in the wear surface layer (16); a first wear warning electrical circuit (68/69/70/74) for communicating with the first pair of conductors (12/14) for providing a first wear warning; and wherein when the wear counterface (50) has worn overlying layers, the wear counterface (50) interconnects the first pair of conductors (12/14) to activate the first wear warning circuit (68/69/70/74)