A measurement device for measuring speeds of rotation of at least two wheels of an aircraft undercarriage includes a measurement unit and a processor unit associated with each wheel. The measurement unit of each wheel is configured to transform the speed of rotation of the wheel into an electrical magnitude. The processor unit of each wheel is configured to acquire the electrical magnitudes produced by at least two measurement units in order to transform the electrical magnitudes into digital measurement signals representative of the speeds of rotation of at least two wheels, and in order to transmit the digital measurement signals to external equipment.

A measurement device for measuring speeds of rotation of at least two wheels of an aircraft undercarriage includes a measurement unit and a processor unit associated with each wheel. The measurement unit of each wheel is configured to transform the speed of rotation of the wheel into an electrical magnitude. The processor unit of each wheel is configured to acquire the electrical magnitudes produced by at least two measurement units in order to transform the electrical magnitudes into digital measurement signals representative of the speeds of rotation of at least two wheels, and in order to transmit the digital measurement signals to external equipment.

A digital displacement sensor and a displacement measuring method thereof, pertaining to the technical field of displacement sensors. The digital displacement sensor includes a housing and a circuit board, and the circuit board is arranged inside the housing. The housing is provided with a window and an opening. The circuit board is provided with a signal acquisition module, an analog front end circuit, a digital compensation circuit, and a signal output interface. The digital displacement sensor allows to alternatively fix the sensor or measured object according to the structure. The measurement can be performed as long as a relative movement between the sensor and the measured object occurs. Factors such as material of the measured object etc. are not limited, so materials such as steel belts, aluminum plates, plastics etc. can be flexibly used. Merely surfaces of the measured object need to be coated with corresponding stripes.

Detecting the source of a defect in a cable may be difficult, in part because present systems may be configured to wind and unwind the cable on many different spools, capstans or other transport equipment. Provided are systems and methods in which a laser speed gauge is used to measure the rotation of a cable assembly component and determine any abnormalities in the rotation (e.g., vibrations, periodic increases/decreases in speed). An example method includes receiving, by a computing device and from a laser speed gauge, a first reading of a rotating cable assembly component. The computing device may covert the first reading of the rotating cable assembly component to a frequency analysis of the rotating cable assembly component and determine based on the frequency analysis of the rotating cable assembly component, a structural defect in a cable caused by the rotating cable assembly component.

Detecting the source of a defect in a cable may be difficult, in part because present systems may be configured to wind and unwind the cable on many different spools, capstans or other transport equipment. Provided are systems and methods in which a laser speed gauge is used to measure the rotation of a cable assembly component and determine any abnormalities in the rotation (e.g., vibrations, periodic increases/decreases in speed). An example method includes receiving, by a computing device and from a laser speed gauge, a first reading of a rotating cable assembly component. The computing device may covert the first reading of the rotating cable assembly component to a frequency analysis of the rotating cable assembly component and determine based on the frequency analysis of the rotating cable assembly component, a structural defect in a cable caused by the rotating cable assembly component.

A hub bearing for motor vehicles includes a rotatable hub and a bearing unit. The bearing unit has a radially outer ring, provided with respective radially outer raceways, a radially inner ring, provided with respective radially inner raceways, and a plurality of rolling bodies positioned between the corresponding inner and outer raceways. The hub bearing has an optical reading device for measuring the rotational speed of one of the hub or the radially inner ring. The optical reading device is mounted on the radially outer ring.

A hub bearing for motor vehicles includes a rotatable hub and a bearing unit. The bearing unit has a radially outer ring, provided with respective radially outer raceways, a radially inner ring, provided with respective radially inner raceways, and a plurality of rolling bodies positioned between the corresponding inner and outer raceways. The hub bearing has an optical reading device for measuring the rotational speed of one of the hub or the radially inner ring. The optical reading device is mounted on the radially outer ring.

An encoder includes a code disc and a processor communicatively coupled with the code disc. The code disc is configured to rotate along with a rotating object and includes a plurality of fan teeth extending radially. Each of the fan teeth includes a first line segment edge, a second line segment edge, and an arc edge along a circumference of the code disc and connecting the first line segment edge and the second line segment edge. The first line segment edges of the fan teeth are arranged at the code disc with equal intervals. A length of the arc edge of one of the fan teeth is different from lengths of the arc edges of other ones of the fan teeth, and the lengths of the arc edges of the other ones of the fan teeth equal each other. The processor is configured to detect a rotation of the code disc to obtain a detection signal, and obtain a rotation parameter of the rotating object based on the detection signal. The rotation parameter includes at least one of a rotation direction, a rotation speed, or a mechanical zero position.

An encoder includes a measurement target and circuitry. The measurement target includes an absolute pattern and is rotatable. The circuitry is configured to generate, via a processing scheme, a signal representing an absolute position of the measurement target based on the absolute pattern. The circuitry is configured to detect, based on the absolute pattern, whether the measurement target rotates or not. The circuitry is configured to change the processing scheme based on whether the measurement target rotates or not.

The disclosure relates to the field of drilling tool attitude measurement, and particularly to a dynamic testing device suitable for a drilling tool attitude measurement module. The dynamic testing device may comprise a test fixture for attitude measurement module, an azimuth rotation device for adjusting an azimuth angle, an inclination angle swing device for adjusting an inclination angle, and a toolface angle rotation device for driving the test fixture for attitude measurement module to rotate, and a rotation speed measurement device for measuring a rotation speed and a self-rotation angle of the test fixture for attitude measurement module in a rotating state. The testing device has characteristics of large bearing weight, high rotation speed which is measurable and controllable, convenient for mounting and fixing a tested module, etc. It can simulate conditions of downhole rotation of a drilling tool, and be used for dynamic testing of the attitude measurement module.