Various embodiments relating to methods for evaluating injury mitigation performance of helmets that are used for sports (e.g., whitewater kayaking and rafting) are described. In one embodiment, a method for evaluating injury mitigation performance of a helmet includes applying a first impact configuration to a first helmet and applying a second impact configuration to a second helmet of the same model as the first helmet. The method further includes generating acceleration data based on impacts that occur as part of the first impact configuration and the second impact configuration. The method further includes determining concussion risk values based on the generated acceleration data. The method also includes determining a concussion risk metric based on the concussion risk values and exposure values.

Devices, methods, and systems for physical contact detection for device pairing are described herein. One device includes a mechanism configured to detect physical contact between the device and a wireless device, a memory, and a processor configured to execute executable instructions stored in the memory to perform a pairing of the wireless device and the device only upon the mechanism detecting the physical contact between the device and the wireless device.

A power reception apparatus includes a secondary coil which receives power in a non-contact state from a power transmission apparatus having a primary coil, while being disposed opposite to the power transmission apparatus, a housing which accommodates the secondary coil to form a space between the secondary coil and the housing, an insulating fluid filled in the space, a measurement unit which measures efficiency of a non-contact power transmission between the primary coil and the secondary coil, and a detection unit which detects damage made to the housing based on a change in the efficiency during the non-contact power transmission.

A sensor device includes: a detection device that detects a predetermined physical quantity and converts the physical quantity into a detection signal; a communication device that is to be connected to a controller through a first line and a second line, performs at least one of reception from the controller or transmission to the controller by a differential transmission method and, based on a request signal received from the controller, transmits the detection signal generated by the detection device; and a conductive shield member that is applied with a constant potential and covers the detection device and the communication device. The conductive shield member reduces radiation noise generation and simplifies the sensor device structure.

A system to monitor a composite system component may include a plurality of sensors mounted proximate to the composite system component. A signal processing unit may receive, from each of the plurality of sensors, a series of sensed values associated with the composite system component and determine a kurtosis value for each series of sensed values. A threshold exceedance detector may detect if at least one of the kurtosis values exceeds a pre-determined threshold value. A delamination location estimation unit may calculate an estimated location of a composite system component delamination alert signal based on calculated time difference delay values of detected signal impulses in the series of sensed values using at least four of the plurality of sensors. A delamination alert output may then transmit a composite system component delamination alert signal, along with the estimated location, when at least one of the kurtosis values exceeds the pre-determined threshold.

A method for controlling a system including a power-tool and a battery having energy storage cells, wherein the system includes an acceleration sensor, a piezoelectric sensor, a controlling device, signal transmitter and a device for measuring a voltage. Method includes the steps: Determining vibration values; Determining that the system is free-falling; Determining an impact of the system by detecting an acceleration value in the X, Y and Z direction exceeding a first predetermined threshold value; and Determine a traveling distance between detecting an acceleration value in the X, Y and Z direction being equal to a predetermined range and detecting an acceleration value in the X, Y and Z direction exceeding the first predetermined threshold value. A system for carrying out the method is also provided.

A method for controlling a system including a power-tool and a battery having energy storage cells, wherein the system includes an acceleration sensor, a piezoelectric sensor, a controlling device, signal transmitter and a device for measuring a voltage. Method includes the steps: Determining vibration values; Determining that the system is free-falling; Determining an impact of the system by detecting an acceleration value in the X, Y and Z direction exceeding a first predetermined threshold value; and Determine a traveling distance between detecting an acceleration value in the X, Y and Z direction being equal to a predetermined range and detecting an acceleration value in the X, Y and Z direction exceeding the first predetermined threshold value.

A system for carrying out the method is also provided.

A measurement system for a vehicle includes an acceleration sensor. A first acceleration sensor of a sensor pair is fastened to a vehicle wheel and a second acceleration sensor of the sensor pair is fastened to the same vehicle wheel diametrically opposite with respect to the wheel axle. An evaluation device is connected to the two acceleration sensors of the sensor pair and generates an output measurement signal using the sensor signals from the two acceleration sensors.

Speed and acceleration calculation and measuring methods and devices based on a regularization algorithm are disclosed. Speed and acceleration are calculated using the following steps: (1) acquiring position data or displacement data; and (2) using the position data or displacement data to calculate the speed and the acceleration with a disclosed regularization method. The disclosed methods and systems avoid the issue of noise amplification that arises when speed and acceleration are measured by existing speed and acceleration devices at high sampling rates. Noise amplification is prevented by first expressing the relationship between position data or displacement data and speed or acceleration into a typical Volterra integral equation of the first kind, and then using the disclosed regularization method to calculate speed and acceleration, thus suppressing noise amplification and accurately extracting speed and acceleration signal values.

A digital camera of a mobile device acquires images for decoding optical patterns in a scene. Sensor data is used to ascertain a state of the mobile device. Battery life is estimated based on the state of the mobile device. A frame rate of the camera is changed from a first frame rate to a second frame rate to conserve battery life while still providing responsive camera performance.