Fos4x Gmbh

Vc Viii Polytech Holding Aps

Florian Rieger

Mathias Müller

Thomas Schauss

Mathias Muller

Matthias Schubert

Thomas Grübler

Mathias Schubert

Benjamin Zorn

Embodiments according to the invention describe a method for monitoring the state of the powertrain or tower of a wind turbine (), said method having the steps of: detecting data of a state monitoring system which is provided for a structure of the wind turbine (), said structure being mechanically coupled to the powertrain or tower; processing the detected data of the state monitoring system which is provided for the structure of the wind turbine (), said structure being mechanically coupled to the powertrain or tower; and determining the state of the powertrain or tower from the processed data of the state monitoring system which is provided for the structure of the wind turbine (), said structure being mechanically coupled to the powertrain or tower.

Method for monitoring the state of the powertrain or tower of a wind turbine, and wind turbine

The invention relates to a method by means of which a system that is capable of oscillating can be monitored. The method comprises detection of natural oscillation modes of the system that can oscillate as a function of at least one operating parameter and/or as a function of at least one environmental parameter of the system that is capable of oscillating, creation of a frequency distribution of the detected natural oscillating modes, division of the natural oscillating modes into frequency classes and, in at least one frequency class, determination of a mode profile over the operating parameter and/or over the environmental parameter.

Method for calibrating nominal frequencies

Embodiments of the invention describe a method for ascertaining a value of an ice buildup quantity on at least one rotor blade () of a wind turbine () and to the use thereof. The method has the steps of ascertaining a base value (G) for at least one natural frequency of the rotor blade when vibrations are excited in an ice buildup-free state; ascertaining a shift base factor for shifting the at least one natural frequency relative to the ice buildup-free state in the event of an ice buildup quantity which is increased by a specific value; detecting a measurement value or a measurement value curve of a measurement variable which is suitable for determining the current natural frequency of the rotor blade (); determining the current natural frequencies of the rotor blade (); and deriving a current shift factor by comparing the current natural frequencies with the base value (G), comparing the current shift factor with the shift base factor, and deriving a value for the ice buildup quantity using the comparison.

Method for ascertaining a value of an ice buildup quantity on at least one rotor blade of a wind turbine, and use thereof

Embodiments describe a method for predicting the accumulation of ice on a rotor blade () of a wind turbine () and the use thereof. The method comprises defining an upper threshold value (So) and/or a lower threshold value (Su) for a system variable (S) which is associated with the mass of the rotor blade () and/or with the mass of an ice attachment () of the rotor blade (); acquiring system variable data during an acquisition time period (T); carrying out a compensation calculation of the curve profile for a prediction time period (&#x394;t', &#x394;t&#x2032;, &#x394;t&#x2032;) from the system variable data which were acquired during a partial time period (&#x394;t, &#x394;t, &#x394;t) of the acquisition time period (T) in order to obtain a prediction curve (N, N, N); carrying out at least one further compensation calculation of the curve profile for a further prediction time period (&#x394;t&#x2032;, &#x394;t&#x2032;, &#x394;t&#x2032;) from the system variable data which were acquired during another partial time period (&#x394;t, &#x394;t, &#x394;t) of the acquisition time period (T) in order to obtain a further prediction curve (N, N, N); determining whether or not the upper threshold value (So) will be exceeded by one or more of the prediction curves (N, N, N) in future and/or whether the lower threshold value (Su) will not be undershot by one or more of the prediction curves (N, N, N) in the future; and outputting the result of the determination; and outputting the result of the determination.

Method for predicting the accumulation of ice on a rotor blade of a wind turbine and the use thereof

The invention discloses an apparatus for measuring the torsion between a first point () and a second point () of a test object (), said second point being spaced apart from the first point. The apparatus comprises the following: a source of polarized light, comprising a polarizing light source () that emits polarized light, or a polarizer () that is connected to a light source () by way of an optical feed; a first optical fibre () that is optically connected to the Output of the polarizing light source () or to the Output of the polarizer () and that is fastened to the test object () at the first point () and at the second point () in such a way that a torsion of the test object about a torsion axis causes a change in the angle of rotation of the first optical fibre from the first point in relation to the second point, and a second polarization-maintaining optical fibre (), that is connected to the first optical fibre () at the second point () or downstream of the second point () in relation to the light path Coming from the source, for supplying the light to a measuring device (), wherein the distance between the first point () and the second point () of the test object () is greater than or equal to 5 metres, or greater than or equal to 7 metres, or greater than or equal to 10 metres, and the first optical fibre () comprises a non-polarization-maintaining, bending-insensitive fibre.

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Munich, Germany

Florian Rieger