Rotary Element Angular Error Measurement Using Inertial Sensors
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Solution Overview
Problem
Existing technologies face challenges in accurately measuring and characterizing the angular errors of inclination of a real axis of rotation in rotary elements, particularly in metrology and machining equipment, which can lead to inaccuracies and reduced quality of equipment performance.
Innovation Solution
A device and method utilizing rotation sensors, including inertial sensors and a specific measurement system, to measure and calculate the angular errors of inclination of a real axis of rotation relative to a reference axis, allowing for automated characterization without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If optical measuring devices or angular measuring devices are used to characterize angular error, then measurement capability is provided, but operator intervention is required and automation is limited
Solution Approach 1:
The measurement system uses inertial sensors that automatically capture angular velocity data and Earth's rotation information without requiring operator intervention. The system self-calibrates by utilizing the known Earth rotation vector to compute the angular error of inclination automatically, eliminating the need for manual operation while maintaining measurement accuracy
Solution Approach 2:
The patent replaces traditional optical and angular measuring devices with inertial sensors that measure angular velocity and Earth's rotation. This substitution enables automated data acquisition and processing, transforming a manually-operated optical system into an autonomous inertial measurement system that computes angular errors through mathematical processing of sensor data
2Measurement precision
If traditional optical or angular measuring devices are used, then angular error measurement is possible, but measurement precision and accuracy are limited
Solution Approach 1:
The patent introduces Earth's rotation as an intermediary reference. By measuring the projection of Earth's known rotation vector onto the sensor axes and comparing it with the actual measured angular velocity, the system creates a reference framework that enables precise computation of angular error of inclination. This intermediary approach provides a reliable basis for high-precision measurement
Solution Approach 2:
The system changes the measurement parameters from direct angular position measurement to angular velocity measurement combined with Earth's rotation projection. By measuring angular velocity components and using the known Earth rotation rate, the system computes angular error through parameter transformation, achieving higher precision than direct angular measurement methods
3Productivity
If the real axis of rotation is not precisely determined, then equipment operation continues, but quality and accuracy of work are reduced
Solution Approach 1:
The patent performs preliminary characterization of the rotary element by measuring and computing the angular error of inclination before the equipment carries out its intended work. The real axis of rotation is determined in advance, and this information is stored for subsequent compensation during operation, ensuring both continuous productivity and high manufacturing precision
Solution Approach 2:
The system establishes a feedback loop where the measured angular error of inclination is used to compensate for deviations in the real axis of rotation. By continuously referencing the predetermined real axis orientation, the system can correct positioning and orientation errors during equipment operation, maintaining high quality standards while ensuring continuous productivity
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
Enables precise determination of the real axis of rotation's orientation, improving the accuracy and quality of metrology and machining equipment operations by accounting for deterministic components of angular errors.
Implementation Method 1
at least two of said above-mentioned sensors being inertial and enabling to obtain projections of the Earth's rotational velocity vector onto at least two projection axes
Data Source
AI summary
The invention relates to a device (100) for measuring the angular errors in the inclination of a real axis of rotation (204) of a rotary element (101), the device comprising control electronics (111) controlling the rotation of the rotary element (101) about its real axis of rotation (204), a first and a second rotation sensor (112a, 112b) for obtaining angular velocities about two measurement axes (302, 304) which are orthogonal to one another and both orthogonal to the real axis of rotation (204), a third rotation sensor (112c) making it possible to obtain the angular position and angular velocity of the rotation element (101) about its real axis of rotation (204), at least two of the aforementioned sensors being inertial sensors making it possible to obtain projections of the vector of the speed of rotation of the Earth onto at least two axes of projection, an acquisition unit (113), a measurements-storage memory (114), a computation unit (115) configured to compute, from the angular positions and velocities obtained from the aforesaid sensors, the angular errors in the inclination of the real axis of rotation (204) of the rotary element (101).