CMM Movable Part Position Estimation Under Mechanical Vibration
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Solution Overview
Problem
Coordinate measuring machines face challenges in accurately determining the position of movable parts due to mechanical vibrations, which are not effectively accounted for by existing methods using acceleration sensors, leading to deviations in phase and amplitude over time.
Innovation Solution
A method involving a position measuring system and acceleration sensors at different locations to measure and correct for mechanical vibrations, using a computational model to estimate position and acceleration deviations, allowing for precise determination of the movable part's position despite vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration sensors are used to measure and correct mechanical vibrations, then position determination accuracy should improve, but measurement precision deteriorates over time due to phase and amplitude deviations
Solution Approach 1:
The patent implements feedback by continuously monitoring acceleration at multiple locations and using this information to dynamically adjust position measurements. The acceleration data from sensors at different locations feeds into a computational model that corrects position deviations in real-time, creating a closed-loop system that maintains accuracy despite vibrations.
Solution Approach 2:
The patent introduces acceleration sensors as intermediary measurement devices that indirectly detect vibration effects. Rather than directly measuring position, the system uses acceleration sensors to detect mechanical disturbances, which then serve as intermediate data for computing position corrections through a computational model.
2Device complexity
If a single acceleration sensor is used, then device complexity is reduced, but measurement reliability worsens due to inability to capture vibration differences at different locations
Solution Approach 1:
The patent divides the vibration measurement task into multiple segments by placing acceleration sensors at different locations on the movable part. Each sensor captures vibration characteristics specific to its location, and the computational model integrates these segmented measurements to achieve comprehensive vibration compensation across the entire movable part.
Solution Approach 2:
The patent adds a spatial dimension to vibration measurement by distributing sensors across different locations rather than relying on a single point measurement. This multi-location approach captures the spatial variation of vibrations, enabling more accurate compensation for position deviations.
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 approach enables reliable correction of mechanical vibrations' effects, ensuring accurate position determination of movable parts in coordinate measuring machines, even under conditions of significant mechanical disturbances.
Implementation Method 1
measuring a first acceleration value at a first acceleration measuring location of the coordinate measuring machine with a first acceleration sensor, measuring a second acceleration value at a second acceleration measuring location of the movable part with a second acceleration sensor
Implementation Method 2
measuring a position value of the movable part with a position measuring system of the coordinate measuring machine
Data Source
AI summary
A position of a movable part of a coordinate measuring machine (CMM) is determined repeatedly. A position value of the part is measured at a reference location. First and second acceleration values are measured at a first and second measuring location. The second measuring location is closer to a measuring sensor than the first measuring location and the first measuring location is closer to the reference location than the second measuring location. A target and/or actual state value is supplied to a model of the CMM. Estimators are modelled. The model is supplied with a position deviation based on the estimator of the position deviation and deviation based on the estimator of the deviation and the deviation of the measured first and second values. The position of the part is determined from the measured position value in relation to the reference location based on the estimator of the position deviation.