The fixing force evaluation method of the present embodiment includes the natural frequency measurement step of measuring the natural frequency of the stator in which the tooth portions and the stator coil are fixed by the insulating paper, and the fixing force evaluation step of evaluating that the fixing force of the insulating paper is larger, when the natural frequency of the stator measured in the natural frequency measurement step is equal to more than a predetermined determination frequency, compared to when the natural frequency is lower than the determination frequency. Thus, since the fixing force of the insulating paper is evaluated in the fixing force evaluation step based on the natural frequency of the stator measured in the natural frequency measurement step, the fixing force of the insulating paper can be evaluated by measuring the natural frequency of the stator without destroying the stator.

A vibration sensor is provided and includes an acoustic transducer, a vibration component, and a housing. The vibration component is connected to the acoustic transducer and configured to transmit an external vibration signal to the acoustic transducer to generate an electrical signal. The housing is configured to accommodate the acoustic transducer and the vibration component and generate vibrations based on the external vibration signal. The vibration component and the acoustic transducer form a plurality of acoustic cavities including a first acoustic cavity spatially connected to the acoustic transducer. The vibration component causes a sound pressure change of the first acoustic cavity in response to the vibrations of the housing. The acoustic transducer generates an electrical signal based on the sound pressure change of the first acoustic cavity. The vibration component includes a first hole part through which the first acoustic cavity is spatially connected to other acoustic cavities.

A vibration sensor is provided and includes an acoustic transducer, a vibration component, and a housing. The vibration component is connected to the acoustic transducer and configured to transmit an external vibration signal to the acoustic transducer to generate an electrical signal. The housing is configured to accommodate the acoustic transducer and the vibration component and generate vibrations based on the external vibration signal. The vibration component and the acoustic transducer form a plurality of acoustic cavities including a first acoustic cavity spatially connected to the acoustic transducer. The vibration component causes a sound pressure change of the first acoustic cavity in response to the vibrations of the housing. The acoustic transducer generates an electrical signal based on the sound pressure change of the first acoustic cavity. The vibration component includes a first hole part through which the first acoustic cavity is spatially connected to other acoustic cavities.

An information processing system comprises: an acquisition means configured to acquire vibration of a device that vibrates during operation, as time-series data of a physical quantity A indicated by a plurality of axis components in a three-dimensional coordinate system; a calculation means configured to calculate a first evaluation value E indicating a degree of bias of the vibration of the device between axes, based on the time-series data of the physical quantity A; and an estimation means configured to estimate a degradation level G of the device based on the first evaluation value E.

An information processing system comprises: an acquisition means configured to acquire vibration of a device that vibrates during operation, as time-series data of a physical quantity A indicated by a plurality of axis components in a three-dimensional coordinate system; a calculation means configured to calculate a first evaluation value E indicating a degree of bias of the vibration of the device between axes, based on the time-series data of the physical quantity A; and an estimation means configured to estimate a degradation level G of the device based on the first evaluation value E.

The present disclosure relates to the technical field of aerodynamic and acoustic measurement, in particular to a comprehensive performance test platform for acoustic liner. Based on this comprehensive performance test platform for acoustic liner, the stress of the measured acoustic liner under high sound intensity can be measured by using strain gauges arranged on the measured acoustic liner, the aerodynamic drag of the measured acoustic liner can be measured by using the drag balance, and the acoustic performance parameters of the measured acoustic liner can be calculated based on the sound pressure data obtained by the microphone array. With this test platform, the stress, the aerodynamic drag and the acoustic performance parameters of the measured acoustic liner can be measured simultaneously, which overcomes the problem of inaccurate experimental data obtained in inconsistent experimental conditions caused by conventional separate acoustic liner tests.

An ultrasonic machining device (1) for machining a workpiece. At least one component, selected from the group including a generator (11), a converter (12), a booster (13), a sonotrode (14), a HV cable (15), a machine frame (16) and a receiving device for the workpiece (17), is/are assigned an identifier (18). The identifier (18) characterizes at least one individual parameter of the component. The device (1) is assigned an input interface (19) which reads in the identifier (18) or generated data from the identifier. The device (1) is assigned a data processing arrangement (20). By way of the data processing arrangement (20), based on the read-in identifier (18) or the data generated from the identifier (18), at least one parameter of the device (1) is determined in such a way that the device (1) is operated in a target operating state, e.g., a resonant vibrating state.

An ultrasonic machining device (1) for machining a workpiece. At least one component, selected from the group including a generator (11), a converter (12), a booster (13), a sonotrode (14), a HV cable (15), a machine frame (16) and a receiving device for the workpiece (17), is/are assigned an identifier (18). The identifier (18) characterizes at least one individual parameter of the component. The device (1) is assigned an input interface (19) which reads in the identifier (18) or generated data from the identifier. The device (1) is assigned a data processing arrangement (20). By way of the data processing arrangement (20), based on the read-in identifier (18) or the data generated from the identifier (18), at least one parameter of the device (1) is determined in such a way that the device (1) is operated in a target operating state, e.g., a resonant vibrating state.

The disclosure provides example mass-sensing instruments and methods for use thereof. A mass-sensing instrument includes a mass sensor that includes a first terminal and a second terminal. The mass sensor has a natural oscillation frequency configured to correspond to a mass of a deposited material on the mass sensor. The mass-sensing instrument also includes a first driving circuit configured to control a first voltage of the first terminal and a second driving circuit configured to control a second voltage of the second terminal.

Creation and use of a digital twin instance (DTI) for a physical instance of the part. The DTI may be created by a model inversion process such that model parameters are iterated until a convergence criterion related to a physical resonance inspection result and a digital resonance inspection result is satisfied. The DTI may then be used in relation to part evaluation including through simulated use of the part. The physical instance of the part may be evaluated by way of the DTI or the DTI may be used to generate maintenance schedules specific to the physical instance of the part.