A force sensor includes a frame and an oscillation structure which has arms and can oscillate freely in the frame. The arms are fixed to suspension frame regions and run transverse to one another at least in sections. At least one conductor extends along at least two arms. An AC voltage can be applied to the at least one conductor to excite at least one oscillation mode of the oscillation structure with a resonant frequency using Lorentz force. The force sensor is designed such that the suspension regions are at least partially spatially displaced relative to one another when a force is applied to the frame, that the magnitude of the spatial displacement of the suspension regions depends on the magnitude of the force, and that the spatial displacement of the suspension regions causes detuning of the resonant frequency, the magnitude of which depends on the spatial displacement magnitude.

Embodiments of the present disclosure relate to a method (100) in particular for checking a mechanical stress acting on an inductive component (210). The method (100) comprises sensing (110) one or more measured quantities dependent on the mechanical stress when an electrical excitation signal is applied to the inductive component (210). Further, the method (100) comprises determining (120) the mechanical stress acting on the inductive component (210) based on the one or more sensed measured quantities.

Embodiments of the present disclosure relate to a method (100) in particular for checking a mechanical stress acting on an inductive component (210). The method (100) comprises sensing (110) one or more measured quantities dependent on the mechanical stress when an electrical excitation signal is applied to the inductive component (210). Further, the method (100) comprises determining (120) the mechanical stress acting on the inductive component (210) based on the one or more sensed measured quantities.

The invention relates to a passive pressure sensor (501) for being introduced into the circulatory system of a human being and for being wirelessly read out by an outside reading system. The pressure sensor comprises a casing (502) with a diffusion blocking layer for maintaining a predetermined pressure within the casing and a magneto-mechanical oscillator with a magnetic object (508) providing a permanent magnetic moment. The magneto-mechanical oscillator transduces an external magnetic or electromagnetic excitation field into a mechanical oscillation of the magnetic object, wherein at least a part of the casing is flexible for allowing to transduce external pressure changes into changes of the mechanical oscillation of the magnetic object. The pressure sensor can be very small and nevertheless provide high quality pressure sensing.

A force control support device includes: a sound wave transmitting unit that causes a sound output device mounted on a user to transmit a first sound wave having a predetermined waveform; a sound wave receiving unit that causes a sound input device mounted on the user to receive a second sound wave based on the first sound wave; an estimation unit that estimates an amount of force being applied by the user based on the first sound wave and the second sound wave; and an electrical stimulation presentation unit that presents an electrical stimulation according to the amount of force estimated by the estimation unit from an electrode mounted on the user.

A force control support device includes: a sound wave transmitting unit that causes a sound output device mounted on a user to transmit a first sound wave having a predetermined waveform; a sound wave receiving unit that causes a sound input device mounted on the user to receive a second sound wave based on the first sound wave; an estimation unit that estimates an amount of force being applied by the user based on the first sound wave and the second sound wave; and an electrical stimulation presentation unit that presents an electrical stimulation according to the amount of force estimated by the estimation unit from an electrode mounted on the user.

A system for estimating tension in a post-tensioned rod is provided. The system includes an impact device for transversely-impacting a post-tensioned rod, an accelerometer configured to generate data indicative of a vibrational response in the post-tensioned rod, and a receiver communicatively coupled to the accelerometer. The receiver includes a display, at least one input device, a communication module, a processor, and one or more memory devices coupled to the processor. Instructions stored on the one or more memory devices, when executed by the processor, cause the processor to receiver the data indicative of a vibrational response in the post-tensioned rod, process the received data to determine a difference between a first and a second modal frequency corresponding to the vibrational response, and store the difference between a first and second modal frequency corresponding to the vibrational response. The receiver is configured to transmit the stored difference between a first and second modal frequency.

A system for estimating tension in a post-tensioned rod is provided. The system includes an impact device for transversely-impacting a post-tensioned rod, an accelerometer configured to generate data indicative of a vibrational response in the post-tensioned rod, and a receiver communicatively coupled to the accelerometer. The receiver includes a display, at least one input device, a communication module, a processor, and one or more memory devices coupled to the processor. Instructions stored on the one or more memory devices, when executed by the processor, cause the processor to receiver the data indicative of a vibrational response in the post-tensioned rod, process the received data to determine a difference between a first and a second modal frequency corresponding to the vibrational response, and store the difference between a first and second modal frequency corresponding to the vibrational response. The receiver is configured to transmit the stored difference between a first and second modal frequency.

A strain sensor includes a flexible substrate and a circuit disposed on the flexible substrate. The circuit includes an inductance to receive an excitation signal, the circuit being configured to generate a radio frequency response to the excitation signal via the inductance. The circuit includes an elongated trace coupled to the inductance and configured to bend and stretch longitudinally upon deformation of the flexible substrate. The elongated trace includes a non-uniformity configured such that the elongated trace deforms and tears at the non-uniformity and exhibits a non-linear increase in resistance as a tensile strain to which the elongated trace is subjected reaches a strain threshold. The non-linear increase in resistance modifies a characteristic of the radio frequency response of the circuit.

A method of determining bearing preload by vibration measurement including mounting the bearing on a vibration tester, the outer ring clamped preventing rotation, mounting a sensor proximate the outer ring to measure vibration, the bearing inner ring rotated to excavate eigen-frequencies, the measured vibration data transmitted from the sensor to a computer workstation, the computer workstation performs a numerical FFT transforming data to Frequency Domain, spectral data from the FFT analyzed with the computer workstation, a peak detection algorithm determines the peaks that are the various modes of the outer ring, the modes are sorted and main modes identified, numerical relationship is obtained for each mode between the resonance and preload, the mode relationships are compared to one or more references, a match between the numerical relationships for each mode and the ideally referenced graph modes indicates a correct preload is determined. Also, a system for carrying out the method.