Example electronic devices for detecting whether a fan of the electronic device is malfunctioning are disclosed. In an example, the electronic device includes a housing, a fan to generate an airflow within the housing, and a microphone coupled to the housing. In addition, the electronic device includes a controller coupled to the microphone and the fan. The controller is to use the microphone to record a fan noise emitted by the fan, and determine whether the fan is malfunctioning based on the fan noise.

Method for analyzing blending mixer performance is provided, which includes providing an apparatus for blending solid particles with a liquid composition, a rotating slinger, and at least one accelerometer positioned adjacent a rotating component for producing a signal that is proportional to an acceleration of the rotating slinger over a frequency range. A recorder for receiving and storing over a time interval the signal is in communication with the accelerometer. The recorded signals are converted to numeric values indicative of a vibrational amplitude of the rotating slinger over the frequency range, and harmonics from the numerical values are identified and used to determine the condition of the rotating slinger.

Method for analyzing blending mixer performance is provided, which includes providing an apparatus for blending solid particles with a liquid composition, a rotating slinger, and at least one accelerometer positioned adjacent a rotating component for producing a signal that is proportional to an acceleration of the rotating slinger over a frequency range. A recorder for receiving and storing over a time interval the signal is in communication with the accelerometer. The recorded signals are converted to numeric values indicative of a vibrational amplitude of the rotating slinger over the frequency range, and harmonics from the numerical values are identified and used to determine the condition of the rotating slinger.

The invention relates to a centrifuge (10), comprising a rotor (12), a drive shaft (14), on which the rotor (12) is supported, a motor (18), which drives the rotor (12) by means of the drive shaft (14), a supporting unit (30) having damping elements (36), each of which comprises a spring axis (36a), which supporting unit supports a rotational unit (19), which comprises the motor (18) together with the drive shaft (14) and the rotor (12), a sensor unit (82, 84) for sensing the rotational speed, a distance sensor (80) for determining imbalances of the rotational unit (19), which rotational unit rotates about an axis of rotation (14a), an acceleration sensor (88) for determining imbalances of the rotational unit (19), and a control and evaluation unit (90), which evaluates the data of the sensors (80, 82, 88), wherein the distance sensor (80) senses distance changes in an operative axis (36b). The invention is characterized in that the operative axis (36b) is oriented in relation to the axis of rotation (14a) in such a way that an angle between the operative axis (36b) and the axis of rotation (14a) of less than 90° including 0° results, at least in a projection onto a plane parallel to the operative axis (36b) and through the axis of rotation (14a).

The present invention relates to a wind turbine rotor balancing method which compensates imbalances between the centres of gravity of the wind turbine blades, in both magnitude and position along said blades, so that the amount of mass needed to carry out this balancing method is minimized, while reducing the loads and vibrations associated with a position of the centre of gravity of the rotor not aligned with the axis of rotation thereof, wherein the invention further relates to the wind turbine rotor balancing system and the wind turbine balanced with the above method.

Assessing and removing jitter from tachometer signals enhances the performance of condition monitoring systems where accurate tachometer signals are needed. A system as disclosed herein can be designed and configured to have a low order of operations, so as to allow for implementation on low cost microcontrollers, which can be important for bused, distributed monitoring systems in which the tachometer zero crossing data is collected at a tachometer sensor and then broadcast to other remote sensors needing that information for vibration or other advanced analysis. Moreover, for monolithic architecture systems (e.g., a centralized processing and control architecture), the low order of operation and small software code base allows the system to be a simple/low cost addition to existing monitoring systems.

A method of detecting machine tool vibration is provided. The method includes receiving, from a sensor arranged in a machine tool, motion data measured along an axis. The method also includes comparing the motion data against a first threshold. The method also includes adjusting a counter if the motion data has a magnitude greater than the first threshold. The method also includes generating an alarm if the counter is greater than a second threshold.

A method of detecting machine tool vibration is provided. The method includes receiving, from a sensor arranged in a machine tool, motion data measured along an axis. The method also includes comparing the motion data against a first threshold. The method also includes adjusting a counter if the motion data has a magnitude greater than the first threshold. The method also includes generating an alarm if the counter is greater than a second threshold.

The present invention relates to a condition monitoring device and method for monitoring an electrical machine. The method comprises obtaining, at periodic instants, measurements from one or more sensors of the condition monitoring device, where each sensor is one of a magnetometer and an accelerometer. The method also comprises comparing, for one or more instants, amplitude data of the measurements with condition monitoring data, wherein the comparison is performed for the amplitude data in one or more axis and at one or more frequencies. The condition monitoring data comprises a relation between a plurality of parameters, a plurality of conditions and a plurality of frequencies. The method additionally comprises detecting a condition and at least one parameter associated with the condition, based on the comparison. According to the detection, the method comprises utilizing the measurements of the at least one parameter for determining a health condition of the electrical machine.

The present invention relates to a condition monitoring device and method for monitoring an electrical machine. The method comprises obtaining, at periodic instants, measurements from one or more sensors of the condition monitoring device, where each sensor is one of a magnetometer and an accelerometer. The method also comprises comparing, for one or more instants, amplitude data of the measurements with condition monitoring data, wherein the comparison is performed for the amplitude data in one or more axis and at one or more frequencies. The condition monitoring data comprises a relation between a plurality of parameters, a plurality of conditions and a plurality of frequencies. The method additionally comprises detecting a condition and at least one parameter associated with the condition, based on the comparison. According to the detection, the method comprises utilizing the measurements of the at least one parameter for determining a health condition of the electrical machine.