A field of electric drive devices, drivetrain systems and electric machines, such as electric motors and electric generators for industrial applications, and more particularly to a method, an arrangement, and a frequency converter for identification of torsional natural frequencies of a drivetrain system. In the arrangement for identification of torsional natural frequencies of a drivetrain system according to the present invention, the drivetrain system includes a frequency converter, an electric machine controlled by the frequency converter, and a driven/driving machine system connected to the electric machine, wherein the frequency converter is arranged for controlling the electric machine for producing mechanical excitation by the electric machine in the drivetrain system, the excitation effecting an excitation response in the drivetrain system; and wherein the frequency converter or a data analysis system of the arrangement is arranged for identifying torsional natural frequencies of the drivetrain system utilizing the excitation response.

A secondary steering pump system may include a secondary steering pump, a bypass valve having a first bypass position configured for placing the secondary steering pump in fluid communication with a hydraulic tank and a second use/testing position configured for placing the secondary steering pump in fluid communication with a steering control circuit. The system may also include a solenoid valve configured for actuation by a solenoid and for selectively actuating the bypass valve from the first position to the second position. The system may also include a pressure sensor configured for sensing pressure in the system.

A system for communicating hose test information using a test results transfer protocol (TRTP) is disclosed. The system also includes a network interface. The system also includes a memory storage. The system also includes one or more processors configured to: initialize a plurality of status words according to the TRTP, generate a payload array configuration having a number of payloads in a payload array and a number of registers, generate the payload array having hose test result information according to the TRTP, and provide the generated payload array to the network interface for transmission.

An appliance management system includes a plurality of appliances connected to a network and a portable terminal. Each of the appliances includes a sensor configured to detect an abnormality of the appliance, and a first near field wireless communication module configured to broadcast an identifier of the appliance when the sensor detects the abnormality. The portable terminal includes a second near field wireless communication module and a controller. The controller is configured to control the second near field wireless communication module to transmit an access request to an abnormal appliance upon the second near field wireless communication module receiving an identifier of the abnormal appliance. The terminal controller is also configured to control a display to display an abnormality screen including the identifier of the abnormal appliance upon the second near field wireless communication module receiving abnormality information from the abnormal appliance.

An abnormality analysis device including: an overall information obtainer that obtains overall information indicating an overall feature amount of a manufacturing system; an overall abnormal degree calculator that calculates an overall abnormal degree that is an abnormal degree of a whole of the manufacturing system by statistically processing the overall information; an individual information obtainer that obtains individual information indicating a feature amount of each of the plurality of constituent elements; an individual abnormal degree calculator that calculates an individual abnormal degree that is an abnormal degree of each of the plurality of constituent elements by statistically processing the individual information; and a determiner that determines whether or not the overall abnormal degree exceeds a threshold value, wherein the individual abnormal degree calculator calculates the individual abnormal degree when the determiner determines that the overall abnormal degree exceeds the threshold value.

An error identification method for identifying an error includes: securing a calibrator having three or more spheres on the table; measuring an initial position of the calibrator with a position measurement sensor tool; calculating a reference angle of each of the rotation axes for positioning the calibrator to a predetermined reference position using a measured value in the measuring; indexing each of the rotation axes individually to a plurality of indexed angles with respect to the reference angle and measuring a center position of a sphere of the calibrator secured on the table at each of the indexed angles with the position measurement sensor tool; and identifying a positioning error and a straightness error of the linear axis, a squareness error between the respective linear axes, and a position error and an inclination error of each of the rotation axes based on a measured value in the indexing.

Disclosed are a device and a method for measuring a fretting displacement in a power cycling of a press-pack insulated gate bipolar transistor (IGBT). The IGBT includes: a bracket; slide bars slidably mounted on the bracket and are arranged at least four along a circumferential direction of the bracket; sensors respectively slidably installed on the bracket and the slide bars; and a power cycling experiment device arranged inside the bracket.

A method for automatic diagnosis of a mechanical system of a group of mechanical systems sharing mechanical characteristics includes obtaining data relating to a vibration. The vibration-related data is acquired by a portable communications device configured to communicate with a remote processor. The processor automatically diagnoses the mechanical system by applying a relationship to the obtained vibration-related data. The relationship is based on sets of vibration-related data previously obtained from the mechanical systems. Each set of vibration-related data relates to vibrations of a mechanical system. The relationship is further based on sets of operation data previously obtained for mechanical systems of the group. Each set of operation data indicates a previous state of operation of a mechanical system. Each of the previous states of operation is associated with at least one of the previously obtained sets of vibration-related data.

A monitoring system for monitoring an escalator is provided. The monitoring system including: a local gateway device; and a sensing apparatus in wireless communication with the local gateway device through a short-range wireless protocol, the sensing apparatus including: an inertial measurement unit sensor configured to detect acceleration data of the escalator.

A sensor unit includes an orientation sensor, an electronic processor coupled to the orientation sensor, and memory coupled to the electronic processor and storing support structure configuration data and instructions. The instructions, when executed by the electronic processor, cause the sensor unit to monitor a position of a conductor support structure associated with the sensor unit based on data from the orientation sensor and generate an alert message responsive to determining that the position violates a position threshold. The position threshold is generated based on the support structure configuration data.