A method for analyzing the condition of a machine, and an apparatus for analyzing the condition of a machine are described.

The invention relates to a method for defining a tension of a belt of an automatic door. The method comprises: exciting a resonant frequency of the belt to cause a vibration of the belt, obtaining motion data representing motion of an electric motor configured to move the belt, defining vibration information representing the vibration of the belt based on the obtained motion data, and defining the tension of the belt based on the defined vibration in-formation and predefined characteristics of the belt. The invention relates also to a door drive unit and a computer program for defining a tension of a belt of an automatic door.

The invention relates to a method for defining a tension of a belt of an automatic door. The method comprises: exciting a resonant frequency of the belt to cause a vibration of the belt, obtaining motion data representing motion of an electric motor configured to move the belt, defining vibration information representing the vibration of the belt based on the obtained motion data, and defining the tension of the belt based on the defined vibration in-formation and predefined characteristics of the belt. The invention relates also to a door drive unit and a computer program for defining a tension of a belt of an automatic door.

A method includes generating movement signals indicative of sensed movement of a powered system in one or more directions and generating fluid level signals indicative of a sensed amount of fluid in the powered system. The method also includes, with one or more processors, receiving the movement signals and the fluid level signals from one or more accelerometers and a fluid level sensor, wherein the one or more processors also configured to filter at least some of the movement signals based on a speed at which the powered system operates. The method also includes, with a first antenna of the sensor assembly, wirelessly communicating one or more of the movement signals or the amount of fluid to a remote location.

A method includes generating movement signals indicative of sensed movement of a powered system in one or more directions and generating fluid level signals indicative of a sensed amount of fluid in the powered system. The method also includes, with one or more processors, receiving the movement signals and the fluid level signals from one or more accelerometers and a fluid level sensor, wherein the one or more processors also configured to filter at least some of the movement signals based on a speed at which the powered system operates. The method also includes, with a first antenna of the sensor assembly, wirelessly communicating one or more of the movement signals or the amount of fluid to a remote location.

A platform for updating one or more properties of one or more digital twins including receiving a request for one or more digital twins; retrieving the one or more digital twins required to fulfill the request from a digital twin datastore; retrieving one or more dynamic models corresponding to one or more properties that are depicted in the one or more digital twins indicated by the request; selecting data sources from a set of available data sources based on the one or more inputs of the one or more dynamic models; obtaining data from selected data sources; determining one or more outputs using the retrieved data as one or more inputs to the one or more dynamic models; and updating the one or more properties of the one or more digital twins based on the one or more outputs of the one or more dynamic models.

A platform for updating one or more properties of one or more digital twins including receiving a request for one or more digital twins; retrieving the one or more digital twins required to fulfill the request from a digital twin datastore; retrieving one or more dynamic models corresponding to one or more properties that are depicted in the one or more digital twins indicated by the request; selecting data sources from a set of available data sources based on the one or more inputs of the one or more dynamic models; obtaining data from selected data sources; determining one or more outputs using the retrieved data as one or more inputs to the one or more dynamic models; and updating the one or more properties of the one or more digital twins based on the one or more outputs of the one or more dynamic models.

An abnormality detection apparatus for detecting an abnormality of a ball screw provided in an injection molding machine includes: a vibration sensor configured to detect vibration of the ball screw; and a computation unit configured to detect an abnormality of the ball screw based on information related to a distribution of frequency components obtained by frequency analysis of a vibration intensity detected by the vibration sensor, and information related to a distribution of frequency components obtained by frequency analysis of a vibration intensity detected when the ball screw, which is normal, operates.

Conditioning monitoring is provided for rotating components in gearboxes that accounts for gear system dynamics, allowing for improved analysis. A rotation rate for the component is generated from vibration data by estimating the rotation rate based on a tachometer measurement of another shaft and the shaft ratio. This estimated rotation rate is used, together with the known configuration of the component, to estimate a known gear mesh frequency of the component. By filtering for a range of frequencies around the gear mesh frequency based on variation in the shaft rate, the gear mesh frequency can be determined and from that signal, an actual rotation rate for the component can be determined. The actual or determined rotation rate can then be used in deriving an analytic vibration spectrum for the component that is not degraded due to gear system dynamics effects.

A method for processing vibration data includes receiving shaft displacement data, from a pair of sensors, including shaft center X-axis displacement and shaft center Y-axis displacement, which are orthogonal to each other. The method includes converting the shaft displacement data to shaft velocity data by calculating a difference in shaft displacement over time and/or converting into shaft acceleration data by calculating a different in shaft velocity over time. The shaft velocity or acceleration data is filtered, sorted and grouped into three or more groups, assigning a color to each velocity group or acceleration group. The method generates an image of a velocity or acceleration orbit plot, where the X-axis displacement and the Y-axis displacement define coordinate pairs of a trace of shaft center displacement, and the velocity or acceleration group between each coordinate pair defines a display color of the trace.