Abstract: A device for measuring cavities has a main body, at least one first distance sensor mounted on the main body and rotatable about an axis of rotation for contactlessly measuring distances in a radial direction with respect to the axis of rotation, a holder for fixing the device within the cavity in a position in which the main body assumes an orientation in which the axis of rotation of the first distance sensor coincides substantially with a center axis of the cavity, and at least one second distance sensor, arranged on the main body, for contactlessly measuring distances in a direction parallel to the axis of rotation, the axis of rotation passing through a detection area of the second distance sensor.

Abstract: A device for measuring cavities has a main body, at least one first distance sensor mounted on the main body and rotatable about an axis of rotation for contactlessly measuring distances in a radial direction with respect to the axis of rotation, a holder for fixing the device within the cavity in a position in which the main body assumes an orientation in which the axis of rotation of the first distance sensor coincides substantially with a center axis of the cavity, and at least one second distance sensor, arranged on the main body, for contactlessly measuring distances in a direction parallel to the axis of rotation, the axis of rotation passing through a detection area of the second distance sensor.

Abstract: Method for monitoring of a wind power plant operated in variable operating states. Start sensor data is obtained in at least one basic operating state of the machine; based on the start sensor data, a starting model with a rule set for conducting the monitoring is set up, the rule set determining which parameters are to be monitored, in which manner and with which weighting and which sensor data are to be obtained and used for this purpose; a reference SOM is prepared using the rule set with sensor data selected using the rule set and obtained in a reference operating phase of the machine; during a monitoring operating phase, time characteristics of a quantization error of the sensor data selected using the rule set being tracked with respect to the reference SOM, troubleshooting being started if the quantization error meets a criterion which is dictated by the rule set.

Abstract: Method for spectral evaluation of oscillation signals which have been obtained on a rotor blade of a wind power installation with an accelerations sensor. In doing so, instead of the otherwise conventional Fourier transform calculation, the spectral power density is computed. In the evaluation, also signal portions are considered which are not detected in the Fourier transform because they do not go back to oscillations which have been excited in the rotor blade.

Abstract: A vibration-resistant wind turbine and process for operation is provided. The wind turbine has a rotor with at least two blades, each of which includes an inclinometer arrangement with at least two axes, and an evaluating unit. The evaluating unit determines the bending and/or twisting of the blade relative to the longitudinal axis of the blade on the basis of signals from the inclinometer arrangement for each blade during operation. Each rotor blade further has at least one liquid tank which is capable of receiving or transferring liquid from or to a liquid reservoir via a transfer mechanism in response to the determined bending and/or twisting of the rotor blades to reduce vibration caused by imbalances, thereby extending the service life of the wind turbine.

Abstract: Method for monitoring of a wind power plant operated in variable operating states. Start sensor data is obtained in at least one basic operating state of the machine; based on the start sensor data, a starting model with a rule set for conducting the monitoring is set up, the rule set determining which parameters are to be monitored, in which manner and with which weighting and which sensor data are to be obtained and used for this purpose; a reference SOM is prepared using the rule set with sensor data selected using the rule set and obtained in a reference operating phase of the machine; during a monitoring operating phase, time characteristics of a quantization error of the sensor data selected using the rule set being tracked with respect to the reference SOM, troubleshooting being started if the quantization error meets a criterion which is dictated by the rule set.

Abstract: A rotating machine element is monitored for displacements using co-rotating sensors for acceleration, rotation or the direction of gravitation. In doing so, the sensor data are received by a, likewise, co-rotating electronic unit. The data can also be stored and further processed in this electronic unit.

Abstract: A device for detecting electrically conductive particles in a liquid flowing in a pipe section, with a transmitter coil surrounding the pipe section for inducing eddy currents in the particles, at least one first inductive receiver coil surrounding the pipe section and a second inductive receiver coil which is spaced axially to the first receiver coil and which surrounds the pipe section, the first and the second receiver coils being located in the region of the transmitter coil and being subtractively connected, in order to output a difference signal according to the eddy currents induced by the transmitter coil, and the transmitter coil forming the primary side and the receiver coils forming the secondary side of a transformer arrangement. An evaluation unit evaluates the difference signal in order to detect passage of electrically conductive particles in the pipe section.

Abstract: A method and a device for dynamic measurement of the radial deformation of a bearing ring (12) of a rolling bearing (10) for a rotating element (16), a glass fiber segment (22) of a fiber optic sensor (24) that is fixed in or to the periphery of the bearing ring, a light signal which has been generated by the light source (30) being injected into the glass fiber segment, and the light signal passing through the glass fiber segment being detected by a detector (34), the longitudinal deformation of the glass fiber segment being determined from the change of at least one parameter of the light signal, when the light signal passes through the glass fiber segment, in order to determine the corresponding radial deformation of the bearing ring.

Abstract: A rotating machine element is monitored for displacements using co-rotating sensors for acceleration, rotation or the direction of gravitation. In doing so, the sensor data are received by a, likewise, co-rotating electronic unit. The data can also be stored and further processed in this electronic unit.

Abstract: A process and device for detecting electrically conductive particles in a liquid flowing in a pipe section, the liquid being exposed to periodic alternating electromagnetic fields by a transmitter coil which induces eddy currents in the particles, a probe made as a coil arrangement and which has an effective width producing a periodic electrical signal based on the eddy currents. The signal ha a carrier oscillation with an amplitude and/or phase which is modulated by particles passing across the effective width of the coil arrangement, the probe signal being filtered by a frequency-selective first filter unit, the filtered signal being sampled by a triggerable A/D converter stage to obtain a demodulated digital measurement signal, the digital measurement signal being filtered by a digital, frequency-selective adjustable second filter unit to obtain a useful signal, and the useful signal being evaluated to detect passage of electrically conductive particles in the pipe section.

Abstract: A method and a device for measuring the loading on rotor blades, especially of wind power plants with swiveling rotor blades, the loading of the rotor blades being determined by way of deformation of a bearing ring of the swiveling rotor blade takes place economically with proximity sensors, but can also take place advantageously with fiber optic sensors. With an electronic evaluation device, the deformation of the bearing ring is referenced to the loading of the rotor blade. In one advantageous embodiment, an inclinometer is also provided.

Abstract: A process for monitoring a machine, within the framework of a FMEA process for at least one component of the machine for at least one predetermined fault which can be diagnosed by means of a diagnosis diagram and a diagnosis system with sensors for detecting physical parameters of the machine, a diagnosis priority number being determined which is the product of the following index quantities: severity of the effect of occurrence of the fault with respect to the serviceability of the machine; expected machine-specific consequential costs when a fault occurs, and the possibility of correction of the fault. The diagnosis priority number is used in the evaluation of the diagnosis diagram, the diagnosis system, the current machine state, the necessary maintenance measures and/or the failure risk of the machine.

Abstract: A vibration-resistant wind turbine and process for operation is provided. The wind turbine has a rotor with at least two blades, each of which includes an inclinometer arrangement with at least two axes, and an evaluating unit. The evaluating unit determines the bending and/or twisting of the blade relative to the longitudinal axis of the blade on the basis of signals from the inclinometer arrangement for each blade during operation. Each rotor blade further has at least one liquid tank which is capable of receiving or transferring liquid from or to a liquid reservoir via a transfer mechanism in response to the determined bending and/or twisting of the rotor blades to reduce vibration caused by imbalances, thereby extending the service life of the wind turbine.

Abstract: A method and a device for dynamic measurement of the radial deformation of a bearing ring (12) of a rolling bearing (10) for a rotating element (16), a glass fiber segment (22) of a fiber optic sensor (24) that is fixed in or to the periphery of the bearing ring, a light signal which has been generated by the light source (30) being injected into the glass fiber segment, and the light signal passing through the glass fiber segment being detected by a detector (34), the longitudinal deformation of the glass fiber segment being determined from the change of at least one parameter of the light signal, when the light signal passes through the glass fiber segment, in order to determine the corresponding radial deformation of the bearing ring.

Abstract: A process for monitoring a drive train component (22) of a wind power plant (10) with a rotor (12), the rotor rpm being detected, the wind power plant being controlled such that the rotor rpm rises during an acceleration phase, during the acceleration phase vibration signals being detected by at least one vibration sensor (30) attached to the drive train component in order to detect vibration spectra at different rotor rpm, and the vibration spectra detected at different rotor rpm being displayed as a superposition spectrum in order to evaluate the state of the drive train component.

Abstract: A process and device for dynamic measurement of the axial deformation of a rotating hollow shaft (10), a glass fiber segment (16) of a fiber optic sensor (18) being attached securely to a section of the inside wall of the hollow shaft (10) extending in axial alignment with the shaft. A light signal produced by a light source (24) is injected into the glass fiber segment (16), and the light signal being detected by a detector (28) after passing through the glass fiber segment (16). Axial deformation of the section of the inside wall of the hollow shaft (10) is ascertained by determining axial deformation of the glass fiber segment (16) from the change of at least one parameter of the light signal that occurs when the light signal passes through the glass fiber segment (16).

Abstract: A process for monitoring a machine, within the framework of a FMEA process for at least one component of the machine for at least one predetermined fault which can be diagnosed by means of a diagnosis diagram and a diagnosis system with sensors for detecting physical parameters of the machine, a diagnosis priority number being determined which is the product of the following index quantities: severity of the effect of occurrence of the fault with respect to the serviceability of the machine; expected machine-specific consequential costs when a fault occurs, and the possibility of correction of the fault. The diagnosis priority number is used in the evaluation of the diagnosis diagram, the diagnosis system, the current machine state, the necessary maintenance measures and/or the failure risk of the machine.

Abstract: A process and device for detecting electrically conductive particles in a liquid flowing in a pipe section, the liquid being exposed to periodic alternating electromagnetic fields by a transmitter coil which induces eddy currents in the particles, a probe made as a coil arrangement and which has an effective width producing a periodic electrical signal based on the eddy currents. The signal ha a carrier oscillation with an amplitude and/or phase which is modulated by particles passing across the effective width of the coil arrangement, the probe signal being filtered by a frequency-selective first filter unit, the filtered signal being sampled by a triggerable A/D converter stage to obtain a demodulated digital measurement signal, the digital measurement signal being filtered by a digital, frequency-selective adjustable second filter unit to obtain a useful signal, and the useful signal being evaluated to detect passage of electrically conductive particles in the pipe section.

Abstract: A process and device for dynamic measurement of the axial deformation of a rotating hollow shaft (10), a glass fiber segment (16) of a fiber optic sensor (18) being attached securely to a section of the inside wall of the hollow shaft (10) extending in axial alignment with the shaft. A light signal produced by a light source (24) is injected into the glass fiber segment (16), and the light signal being detected by a detector (28) after passing through the glass fiber segment (16). Axial deformation of the section of the inside wall of the hollow shaft (10) is ascertained by determining axial deformation of the glass fiber segment (16) from the change of at least one parameter of the light signal that occurs when the light signal passes through the glass fiber segment (16).