Abstract: The invention relates to a method of evaluating the play between two threaded components, a first component comprising an internal thread, and a second component comprising an external thread that corresponds to the internal thread of the first component, the components are engaged with each other the method comprising the steps of: applying a torque from a motor to said components such that a first side of the internal thread is in contact with an opposing first side of the external thread wherein the two components are mutually rotated, which mutual rotation yields a mutual translation movement of the two threaded components; fixing the components with respect to each other, such that no mutual translation movement is allowed, whereas mutual rotation is still allowed; withholding the applied torque to one of said components, until a second side of the internal thread is in contact with an opposing second side of the external thread, monitoring the applied torque during the above steps by determining the pow

Abstract: The invention relates to a method of evaluating the play between two threaded components, a first component comprising an internal thread, and a second component comprising an external thread that corresponds to the internal thread of the first component, the components are engaged with each other the method comprising the steps of: applying a torque from a motor to said components such that a first side of the internal thread is in contact with an opposing first side of the external thread wherein the two components are mutually rotated, which mutual rotation yields a mutual translation movement of the two threaded components; fixing the components with respect to each other, such that no mutual translation movement is allowed, whereas mutual rotation is still allowed; withholding the applied torque to one of said components, until a second side of the internal thread is in contact with an opposing second side of the external thread, monitoring the applied torque during the above steps by determining the pow

Abstract: In a diagnosing method for an apparatus having movable mechanical components and a diagnosing device, an instantaneous total supply of power is measured and recorded as a function of time. A dynamic physical power-flow model of the driven apparatus is created. The model is described by means of parameters directly connected to mechanical and/or electromagnetic quantities of the individual components of the apparatus. The parameters are adapted to fit the power consumption calculated from the model to the recorded power signatures. A diagnosis is performed based on the adapted parameters. The diagnosing device has a power meter and a processor, the processor being arranged for: obtaining a power signal representing supplied power as a function of time; providing the dynamic power-flow model; and adapting values of model parameters of the dynamic physical power-flow model to fit signatures of said power signal and for diagnosing the apparatus.

Abstract: In the present invention the instantaneous supply of power to a driving machine (12) is measured and recorded as a function of time. Based on mechanical design considerations, a dynamic physical power-flow model (26) of the driven apparatus (10) is created. The model (26) represents a course of events, at least partly aperiodic, and is described by means of parameters directly connected to mechanical and/or electromagnetic quantities of the individual components of the apparatus (10). The parameters are adapted in order to fit the power consumption calculated from the model to be recorded power signatures. A diagnosis is performed based on the adapted parameters. The power signatures are preferably analysed within separate time domains, associated with different part events of the apparatus operation. The model (26) preferably comprises components associated with ideal operation as well as of possible predicted faults, however, no pre-recorded sample power signals have to be provided.