A method for examining the raceway of a large roller bearing in a wind turbine, in which a raceway of the large roller bearing is measured using an ultrasonic measuring unit mounted on the bearing housing, wherein the ultrasonic measuring unit detects two edges of the raceway and the relative position and/or formation thereof in relation to one another is measured.

A crystal self-test circuit is used to self-test either an acoustic emission crystal or a vibration crystal installed onto one of a bearing, a bearing housing, and a machine. A crystal self-test circuit includes a multiplexer IC, which toggles between a pulse injection configuration and a signal collection configuration. In the pulse injection configuration, the multiplexer IC provides signal communication between a crystal self-test input and the sensing emission crystal. In the signal collection configuration, the multiplexer IC provides signal communication between the sensing emission crystal and a signal analyzer. In operation, the multiplexer IC applies a waveform (preferably a square wave) to the sensing emission crystal over a predetermined time period. The multiplexer IC then toggles to collect the output waveform from the sensing emission crystal and forwards the output waveform to the signal analyzer. The output signal can be amplified by a signal amplifier.

A spherical body inspection apparatus including a support arrangement realized to support a spherical body during an inspection procedure; a probe arrangement comprising a plurality of UT probes arranged about the spherical body such that the UT probes target a common test point at the surface of the spherical body; and a displacer for effecting at least one relative rotational displacement between the spherical body and the probe arrangement. Also described is a method of inspecting a spherical body.

An apparatus for airborne-sound-based condition monitoring of a device includes at least one microphone assigned to each component of a plurality of components of the device that is to be monitored.

A system includes an industrial machine that includes a motor and a motor bearing. The system also includes multiple acoustic sensors disposed adjacent the industrial machine. The system further includes multiple other sensors disposed adjacent the industrial machine. The system even further includes a controller programmed to receive noise signals representative of a noise made by the motor bearing acquired by the multiple acoustic sensors, to receive signals representative of operational conditions of the industrial machine, to analyze the noise signals to determine characteristics of the noise, to analyze the characteristics of the noise utilizing the operational conditions, to compare the characteristics of the noise to a plurality of models associated with different noises made by the motor bearing that are associated with a particular abnormal operation, and to select a model from the plurality of models that matches the characteristics of the noise.

The invention relates to a slewing bearing that includes an inner ring, an outer ring, at least one row of rolling elements arranged between the rings in order to form an axial thrust that transmits axial forces, and at least one row of rolling elements arranged between the rings in order to form a radial thrust which can transmit radial forces. The slewing bearing further includes a sensing probe for detecting a relative displacement between the inner ring and outer ring and/or cracks, the inner ring having a through hole in which the sensing probe arranged. The through hole has a probe positioning element provided with a positioning portion and a support portion on which the sensing probe is supported so as to face the outer ring.

According to the method of the invention, a lubricant is supplied incrementally to a rotary bearing while the bearing is in operation rotating at a rotational speed. The lubricant is supplied in consecutive steps so that at each step a portion of a prescribed amount of lubricant is supplied, followed each time by an ultrasound measurement. A first ultrasound measurement is performed before the first supply step, and starting from the second supply step, each measurement result is compared at least to the previous result, in order to evaluate the bearing condition and decide on that basis whether to continue the sequence or not. Stopping the sequence is decided when the lubrication of the bearing is assessed as successful, a lubrication failure or over-lubrication.

A system for nondestructive evaluation of a test object includes a platform, an electromagnetic acoustic transducer (EMAT) to create acoustic vibrations that travel along the test object; an infrared detector positioned to record thermal images of a plurality of test areas on the test object to detect flaws in the test object as the platform and the test object move relative to each other; and a control connected to actuate the EMAT and the infrared detector, synchronize the creation of vibrations with the recording of thermal images, receive a signal from the infrared detector indicative of the thermal image of the surface of the test object, and record locations of the flaws appearing on the thermal images of the test areas, all as the platform and the test object move relative to each other.

A method and apparatus for measuring damping of a work piece are provided. The method includes determining at least one suitable location to measure damping on the work piece, exciting the work piece at the at least one suitable location, measuring a dynamic response of the work piece at the suitable location, and calculating a damping factor and a Q factor from the dynamic response. The apparatus includes a response measurement device configured to obtain response data, such as displacement data and/or velocity data, used in determining the at least one suitable location to measure damping.

The invention relates to a method for testing of a train wheel by ultrasound. The method is based on a pulsed ultrasonic field in the train wheel to be tested by an array of individually controllable ultrasonic transmitting transducers acoustically coupled to the train wheel each controlled with a specific analog transient excitation signal. Each analog transient excitation signal generated based on an ultrasonic transmitting transducer-specific stored digital transient excitation function. The resulting echo signals from the train wheel to be tested are recorded by an array of individually controllable ultrasonic receiving transducers. Each ultrasonic receiving transducer can provide an analog, time-resolved echo signal. The received echo signals can be digitized in a transducer-specific way and stored in a set. A plurality of different reception processing rules can then be applied to the latter. Furthermore, the invention relates to a device for carrying out the method.