A motion measurement apparatus according to an embodiment of the present technology includes a detector unit, a controller unit, and an output unit. The detector unit is to be attached to a detection target and detects velocity-related information, the velocity-related information being related to temporal changes in velocities in three-axis directions of the detection target being in motion in a space. The controller unit extracts a motion feature amount including one or a plurality of kinematic physical quantities of the detection target on the basis of the velocity-related information. The output unit generates a perceivable measurement signal that changes depending on the motion feature amount.

Systems and methods are provided for estimating a walking speed of a subject. A method comprises mounting an inertial measurement unit (IMU) on a wrist of the subject, the IMU configured to generate acceleration and rate of turn signals; processing the acceleration and rate of turn signals from the IMU to generate a pitch angle and a roll angle; processing the pitch angle and the roll angle to generate a rotation matrix from a sensor frame of the IMU to a navigation frame of the subject; applying the rotation matrix to the acceleration signals and removing gravitational acceleration to generate an external acceleration signal; processing the external acceleration signal to determine a principal horizontal axis and to generate a principal component acceleration signal representing external acceleration along the principal horizontal axis; and processing the principal component acceleration signal using a regression-based method to determine an estimated walking speed of the subject.

A system and method wherein ball spin rate and axis orientation are determined according to an electronic circuit that includes a magnetometer spin sensor module and, in the alternative, an electronic circuit that includes a spin sensor module with a plurality of accelerometers.

There is provided a method for diagnosing the presence of failure or abnormal operation of a wheel bearing. The method includes detecting acceleration information by an acceleration sensor mounted to a rotational central axis of the wheel bearing or at a position radially spaced apart from the rotational central axis and configured to rotate together with the wheel bearing; calculating speed information based on the acceleration information detected by the acceleration sensor; and diagnosing the wheel bearing based on the acceleration information detected by the acceleration sensor and the speed information calculated from the acceleration information. In the acceleration detection step, the acceleration sensor collects the acceleration information in at least one of a first direction extending radially from the rotational central axis of the wheel bearing and a second direction perpendicular to the first direction on a plane perpendicular to the rotational central axis of the wheel bearing.

There is provided a method for diagnosing the presence of failure or abnormal operation of a wheel bearing. The method includes detecting acceleration information by an acceleration sensor mounted to a rotational central axis of the wheel bearing or at a position radially spaced apart from the rotational central axis and configured to rotate together with the wheel bearing; calculating speed information based on the acceleration information detected by the acceleration sensor; and diagnosing the wheel bearing based on the acceleration information detected by the acceleration sensor and the speed information calculated from the acceleration information. In the acceleration detection step, the acceleration sensor collects the acceleration information in at least one of a first direction extending radially from the rotational central axis of the wheel bearing and a second direction perpendicular to the first direction on a plane perpendicular to the rotational central axis of the wheel bearing.

According to one embodiment of the present disclosure, there is provided a failure diagnosis device used for diagnosing the presence of failure or abnormal operation of a wheel bearing. The failure diagnosis device according to one embodiment of the present disclosure may comprise a housing; a magnetic coupling part provided in the housing; and a sensing part provided in the housing and configured to detect physical characteristic related to an operational state of a vehicle. According to one embodiment of the present disclosure, the sensing part may comprise an acceleration sensor configured to collect acceleration information, and the failure diagnosis device may be configured to be detachably mounted to one side of a wheel by virtue of a magnetic force generated by the magnetic coupling part.

According to one embodiment of the present disclosure, there is provided a failure diagnosis device used for diagnosing the presence of failure or abnormal operation of a wheel bearing. The failure diagnosis device according to one embodiment of the present disclosure may comprise a housing; a magnetic coupling part provided in the housing; and a sensing part provided in the housing and configured to detect physical characteristic related to an operational state of a vehicle. According to one embodiment of the present disclosure, the sensing part may comprise an acceleration sensor configured to collect acceleration information, and the failure diagnosis device may be configured to be detachably mounted to one side of a wheel by virtue of a magnetic force generated by the magnetic coupling part.

A method, a device and a system for safely and reliably performing real-time speed measurement and continuous positioning are provided. With the method, inertial navigation data from an inertial navigation signal source arranged in a train is detected, and correction data from a correction signal source is detected. In a case that no correction data is detected, a current speed and a current position of the train is determined based on the inertial navigation data, and in a case that the correction data is detected, the inertial navigation data is corrected with the correction data, and a current speed and position of the train are determined based on the corrected inertial navigation data. Therefore, even in the case that no correction data is detected, the real-time speed measurement and continuous positioning can be performed safely and reliably based on the inertial navigation data.

A wheel position detection apparatus applied to a vehicle including a vehicle body attached with multiple travelling wheels. The apparatus includes: multiple transmitters respectively disposed at travelling wheels; and a receiver disposed at the vehicle body. The transmitter includes: an acceleration sensor outputting a detection signal according to an acceleration including a gravitational acceleration component being varied by a rotation of the corresponding travelling wheel attached with the transmitter; and a first controller creating a frame including unique identification information, and transmit the frame in response to the receiver outputting a transmission command. The receiver includes a second controller executing a wheel position detection through: identifying, from each set of the unique identification information included in the frame, which of the travelling wheels is attached with the transmitter having transmitted the frame; and registering the travelling wheels in association with the unique identification information of the transmitter.

Methods, techniques, apparatus, and algorithms are described for robustly measuring real-world distances using any mobile device equipped with an accelerometer and monocular camera. A general software implementation processes 2D video, precisely tracking points of interest across frames to estimate the unsealed trajectory of the device, which is used to correct the device's inertially derived trajectory. The visual and inertial trajectories are then aligned in scale space to estimate the physical distance travelled by the device and the true distance between the visually tracked points.