A dynamic balance testing device includes a vibrating unit configured to rotatably hold a predetermined rotating body being a specimen, a first spring configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a direction parallel to a rotation axis of the predetermined rotating body, and at least three second springs configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a predetermined direction orthogonal to the rotation axis. The at least three second springs are attached to the vibrating unit on a same predetermined plane, and the vibrating unit holds the predetermined rotating body such that a projection of a center of gravity of the predetermined rotating body onto the predetermined plane is substantially at the same position as a position where the first spring is attached to the vibrating unit.

A dynamic balance testing device includes a vibrating unit configured to rotatably hold a predetermined rotating body being a specimen, a first spring configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a direction parallel to a rotation axis of the predetermined rotating body, and at least three second springs configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a predetermined direction orthogonal to the rotation axis. The at least three second springs are attached to the vibrating unit on a same predetermined plane, and the vibrating unit holds the predetermined rotating body such that a projection of a center of gravity of the predetermined rotating body onto the predetermined plane is substantially at the same position as a position where the first spring is attached to the vibrating unit.

Disclosed is a fault detection system for a vacuum pump. The fault detection system for a vacuum pump according to an embodiment of the disclosure includes an acoustic sensor configured to detect sounds, generate a sound pattern from the sounds, and collect the sound pattern and a processor configured to analyze the sound pattern and identify whether a vacuum pump is faulty.

Disclosed is a fault detection system for a vacuum pump. The fault detection system for a vacuum pump according to an embodiment of the disclosure includes an acoustic sensor configured to detect sounds, generate a sound pattern from the sounds, and collect the sound pattern and a processor configured to analyze the sound pattern and identify whether a vacuum pump is faulty.

A printing cylinder assembly for detecting existing and/or developing errors during printing comprising at least one printing cylinder which is suitable for printing on a material, and has at least one cylindrical body, at least one shaft forming a rotational axis for the body, and characterized by the printing cylinder which has at least one cavity extending from the surface of the body towards its interior volume, at least one sensor which is suitable for being placed in the said cavity, at least one communication interface which is suitable for communicating with an external device, at least one control unit which is adapted to receive data from the sensor, and transfer these data to an external device via the communication interface directly and/or by processing them, and at least one power supply which is for supplying the power needed by the sensor, the communication interface and/or the control unit.

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

Disclosed is a radial fault simulation test system for rotary mechanical equipment. The system comprises a simulation test bed, a data collection system and a control system, wherein the data collection system is used for collecting the operation state data of a rotating shaft; and the control system is used for receiving the data collected by the data collection system, analyzing and processing the data, and controlling the simulation test bed according to an analysis result. The system adopts a modular design, can simulate the operation state and the fault type of the rotary mechanical system under different rotation conditions and structural forms, can realize a simulation test of the rotary mechanical system under different fault states, and can preferably ensure the accuracy of the test performance of the simulation test.

Disclosed is a radial fault simulation test system for rotary mechanical equipment. The system comprises a simulation test bed, a data collection system and a control system, wherein the data collection system is used for collecting the operation state data of a rotating shaft; and the control system is used for receiving the data collected by the data collection system, analyzing and processing the data, and controlling the simulation test bed according to an analysis result. The system adopts a modular design, can simulate the operation state and the fault type of the rotary mechanical system under different rotation conditions and structural forms, can realize a simulation test of the rotary mechanical system under different fault states, and can preferably ensure the accuracy of the test performance of the simulation test.

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.