Percussion Detection Using Accelerometer and Magnetometer Fusion
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Solution Overview
Problem
Existing percussion event detection devices have a significant detection error rate and high complexity, often confusing strong angular acceleration with genuine percussion events.
Innovation Solution
A device comprising at least one axial accelerometer and an additional axial sensor insensitive to translational vibrations, combined with low cut-off filtering and analysis means that compare measurements with thresholds, effectively distinguishing between rapid rotational acceleration and percussion events by centering and comparing vector norms within a sliding window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If at least one axial accelerometer is used for percussion detection, then the device can detect translational vibrations, but the detection error rate increases and complexity increases
Solution Approach 1:
The patent combines accelerometer data with additional axial sensor data (from magnetometers, gyrometers, or photoelectric cells) to detect both translational and rotational movements. This merging of multiple sensor types allows the system to distinguish between genuine percussion events and false positives caused by rapid rotational acceleration, thereby improving detection accuracy while managing complexity through integrated processing.
Solution Approach 2:
The patent introduces additional axial sensors as intermediary elements that measure orientation relative to a vector field. These sensors act as mediators between the accelerometer and the final detection decision, providing contextual information about rotational movement that helps filter out false positives and improve the overall detection accuracy.
2Measurement precision
If additional axial sensors are added to measure orientation, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The additional axial sensors serve multiple functions: they measure orientation relative to a vector field, detect rapid rotational acceleration, and provide data for distinguishing between percussion events and rotational movements. By making these sensors multi-functional, the patent improves detection accuracy without proportionally increasing complexity, as the same sensors contribute to multiple detection objectives.
3Reliability
If low cut-off filtering is applied to enhance detection quality, then false positives are reduced, but processing time increases
Solution Approach 1:
The patent applies low cut-off filtering as a preliminary action before the final detection decision. By filtering the sensor data in advance to remove high-frequency noise and isolate relevant signals, the system prepares clean data for the detection algorithm, reducing false positives and improving reliability. The filtering is performed on a window of data related to the anticipated event, optimizing the balance between processing time and detection accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces detection errors and enhances the accuracy of percussion event detection, allowing for precise differentiation between rapid acceleration and percussion events, even when the axis of acceleration is unknown.
Implementation Method 1
The device comprises at least one axial accelerometer
Implementation Method 2
The additional axial sensors may be, for example, magnetometers, gyrometers or photoelectric cells
Implementation Method 3
The additional axial sensors may be, for example, magnetometers, gyrometers or photoelectric cells
Implementation Method 4
low cut-off filtering means provided with at least one input receiving measurements transmitted by the axial sensor or sensors
Data Source
AI summary
The device for detecting percussion events (DISP) comprises at least one axial accelerometer sensor (ACC1, ACC2, ACC3), characterized in that it also comprises at least one additional axial sensor insensitive to the translational vibrations (MAGN1, MAGN2), for measuring an information item representative of the orientation of the device (DISP) relative to a vector field of known direction within a fixed coordinate system not linked to the device (DISP), and low cut-off filtering means (FILTCB) provided with at least one input receiving measurements transmitted by the axial sensor or sensors (ACC1, ACC2, ACC3, MAGN1, MAGN2), means (AN) of analyzing the measurements filtered by said low cut-off filtering means (FILTCB), comprising comparison means (COMP) for comparing data from the analysis means (AN) with one or two thresholds (SP, SN).