Measurement Point Determination for Coordinate Measuring Machines
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Solution Overview
Problem
Coordinate measuring machines (CMMs) face a trade-off between the number of measurement points and measurement uncertainty, where increasing the number of points reduces uncertainty but prolongs measurement time, necessitating a method to minimize points while maintaining uncertainty within acceptable limits.
Innovation Solution
A measurement point determination method that estimates uncertainty using a constrained Monte-Carlo simulation method to determine the optimal number and arrangement of measurement points based on a target uncertainty value, reducing the number of points while ensuring accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of measurement points is increased, then measurement uncertainty is reduced, but measurement time becomes longer
Solution Approach 1:
The patent applies parameter changes by using Monte Carlo simulation to evaluate measurement uncertainty across different measurement point configurations. This allows determination of the optimal number of measurement points that achieves target uncertainty while minimizing measurement time, rather than simply increasing points to reduce uncertainty.
2Loss of time
If the number of measurement points is reduced, then measurement time is shortened, but measurement uncertainty increases
Solution Approach 1:
The patent applies preliminary action by performing Monte Carlo simulation evaluations before actual measurement to determine the optimal number of measurement points. This pre-evaluation ensures that the measurement plan is optimized to achieve target uncertainty with minimal measurement time, avoiding both excessive points and insufficient points.
Data Source
AI summary
A measurement point determination method for determining the number or an arrangement of measurement points for a measurement apparatus that performs measurement processing of a measurement item at a plurality of measurement points, the method comprises the steps of acquiring a minimum value and a maximum value of the number of measurement points, acquiring a target value of uncertainty for the measurement item of the measurement apparatus, estimating uncertainties when the measurement item is measured by the measurement apparatus using two or more of the numbers of measurement points between the minimum value and the maximum value of the number of measurement points, and determining the number of measurement points of the measurement apparatus on the basis of the target value and the estimated uncertainties.