A sensor system for monitoring a condition of a piston rod includes an interrogator system having a first coil winding coupled to a housing and radially spaced from the piston rod such that a gap is defined between the first coil winding and the piston rod. A second coil winding is coupled to the piston rod and is inductively coupled to the first coil winding. The second coil winding is configured to communicate with the first coil winding through a range of linear movement of the piston rod relative to the housing. A sensor is coupled to the second coil winding. The sensor is configured to measure a characteristic associated with the piston rod and generate a current in the second coil winding to transmit, via the inductive coupling with the first coil winding, an electrical output signal associated with the characteristic to the interrogator system.

An inspection system for mounting on a user's hand. The inspection system comprising: an imaging unit comprising two sub-units, the first sub-unit being configured to provide images from a first point of view and the second sub-unit being configured to provide images from a second point of view; and a measuring unit configured to provide data relating to a physical property measured at a measurement location on the user's hand. The imaging unit has a separation sensor configured to measure the separation between the two sub-units of the imaging unit. A method of inspecting and/or servicing a machine is also disclosed.

An inspection system for mounting on a user's hand. The inspection system comprising: an imaging unit comprising two sub-units, the first sub-unit being configured to provide images from a first point of view and the second sub-unit being configured to provide images from a second point of view; and a measuring unit configured to provide data relating to a physical property measured at a measurement location on the user's hand. The imaging unit has a separation sensor configured to measure the separation between the two sub-units of the imaging unit. A method of inspecting and/or servicing a machine is also disclosed.

An electric drive unit having an electric motor having a flange-mounted adapter that is attached to the electric motor and has a motor shaft extension for extending the motor shaft through the adapter. The electric drive unit has at least one sensor for measuring at least one operating variable of the electric motor and an evaluation unit for evaluating the operating variable(s) measured by the sensor(s). The sensor(s) and evaluation unit are arranged in and/or on the electric motor and/or adapter. The evaluation unit is designed to evaluate the measured operating variable(s) with respect to the need for maintenance and/or repair and to output a signal about the need for maintenance and/or repair via a signal transmission device for signaling the need for maintenance if the result of the evaluation of the operating variable(s) indicates the need for maintenance.

An electric drive unit having an electric motor having a flange-mounted adapter that is attached to the electric motor and has a motor shaft extension for extending the motor shaft through the adapter. The electric drive unit has at least one sensor for measuring at least one operating variable of the electric motor and an evaluation unit for evaluating the operating variable(s) measured by the sensor(s). The sensor(s) and evaluation unit are arranged in and/or on the electric motor and/or adapter. The evaluation unit is designed to evaluate the measured operating variable(s) with respect to the need for maintenance and/or repair and to output a signal about the need for maintenance and/or repair via a signal transmission device for signaling the need for maintenance if the result of the evaluation of the operating variable(s) indicates the need for maintenance.

This system identification method includes: a step (S1) for measuring frequency responses (ω, H.sub.R1), (ω, H.sub.R2) . . . , and (ω, H.sub.Rn) in a real system under n sets of disturbances of different magnitudes; a step (S3) for calculating frequency responses (ω, H.sub.M1), (ω, H.sub.M2) . . . , (ω, H.sub.Mn) from input to output in n sets of mechanical models M1 to Mn including i sets (i is an integer of 1 or greater) of common parameters that do not change due to disturbance and j sets of disturbance variable parameters that do change due to disturbance; a step (S4) for calculating the values of a total of n sets of evaluation functions F (H.sub.Rk, H.sub.Mk) and the sum σF thereof, and steps (S3 to S6) for searching for the values of i sets of common parameters and j×n sets of disturbance variable parameters for which the sum σF would meet convergence conditions.

This system identification method includes: a step (S1) for measuring frequency responses (ω, H.sub.R1), (ω, H.sub.R2) . . . , and (ω, H.sub.Rn) in a real system under n sets of disturbances of different magnitudes; a step (S3) for calculating frequency responses (ω, H.sub.M1), (ω, H.sub.M2) . . . , (ω, H.sub.Mn) from input to output in n sets of mechanical models M1 to Mn including i sets (i is an integer of 1 or greater) of common parameters that do not change due to disturbance and j sets of disturbance variable parameters that do change due to disturbance; a step (S4) for calculating the values of a total of n sets of evaluation functions F (H.sub.Rk, H.sub.Mk) and the sum σF thereof, and steps (S3 to S6) for searching for the values of i sets of common parameters and j×n sets of disturbance variable parameters for which the sum σF would meet convergence conditions.

The present invention relates to a rotary jig for rotation of a crank shaft of a vehicle and a measuring system using the same. The measuring system includes: a rotary jig (100) for rotating a crank shaft (C) by opening only a bonnet in a vehicle stop state; a probe (700) joined to the position where a spark plug of an engine is separated and having an extension rod located at the center of a piston to check a top dead point and to output signal values when the crank shaft is rotated according to rotation of the rotary jig; a pump (810) for supplying air to a cylinder chamber of the engine through a tube connected to the probe (700) to move the piston; a terminal (900) for outputting the signal value of the probe (700) to a display unit through wireless communication; and a control unit (800) for controlling the signal values.

The measuring system can rotate the crank shaft after a worker opens only a bonnet and mounts the rotary jig at an end portion of the crank shaft when the crank shaft is rotated, thereby enabling the worker to simply measure an operational state of the engine linked with the crank shaft.

Disclosed in embodiments of the present invention are a synchronous control method and system for a laser test of an optical engine. The operation of a laser can be driven by the synchronous control system. When a test of a data point is finished and the optical engine stops for optical window cleaning, the laser may still maintain stable operation under the driving of the synchronous control system, experiments may be directly carried out next time, and thus, laser test efficiency of the optical engine can be improved. Moreover, the synchronous control system is adopted to independently drive the laser to achieve energy stability before experiments, preventing an influence of long-term operation on the performance of the optical engine, and improving test accuracy.

Disclosed in embodiments of the present invention are a synchronous control method and system for a laser test of an optical engine. The operation of a laser can be driven by the synchronous control system. When a test of a data point is finished and the optical engine stops for optical window cleaning, the laser may still maintain stable operation under the driving of the synchronous control system, experiments may be directly carried out next time, and thus, laser test efficiency of the optical engine can be improved. Moreover, the synchronous control system is adopted to independently drive the laser to achieve energy stability before experiments, preventing an influence of long-term operation on the performance of the optical engine, and improving test accuracy.