Probe Speed Control for Complex Shape Measurement Curvature
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Solution Overview
Problem
Existing shape measuring apparatuses using simple straight lines and circles as movement paths often fail to achieve sufficient measurement accuracy for complex-shaped objects, as they do not account for the calculation of maximum speed along curved paths, particularly in areas with large curvature.
Innovation Solution
A control method that divides the movement path into sections, calculates the curvature radii, and determines the maximum speed based on the effective radius to ensure accurate and efficient scanning, allowing for constant, accelerating, or decelerating speed patterns to maintain the probe's movement along complex curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple straight line or circle is used as a movement path, then the device complexity is reduced, but the measurement precision deteriorates for complex-shaped objects
Solution Approach 1:
The patent divides a complex curved movement path into multiple sections, where each section can be independently controlled. This allows the system to use simple geometric shapes (straight lines, circles) for each section while collectively forming a complex path that achieves high measurement precision for complex-shaped objects.
2Productivity
If the probe movement speed is increased to improve productivity, then the measurement time is reduced, but the measurement precision deteriorates in areas with large curvature
Solution Approach 1:
The patent implements dynamic speed control where the probe movement speed is automatically adjusted based on the curvature of the movement path. In sections with large curvature, the speed is reduced to maintain measurement precision, while in sections with small curvature, the speed is increased to improve productivity. This dynamic adaptation resolves the contradiction between speed and precision.
3Measurement precision
If a smooth curve is used as a movement path to improve measurement precision for complex shapes, then the measurement accuracy is improved, but the device complexity increases due to the need for speed control calculations
Solution Approach 1:
The patent segments the complex curved path into multiple simpler sections, each with defined geometric characteristics. This segmentation simplifies the speed control calculations by allowing the system to apply different speed control strategies to each section based on its curvature properties, rather than requiring complex continuous calculations for the entire path.
Solution Approach 2:
The patent performs preliminary calculations of the movement path characteristics, including curvature and section divisions, before the actual measurement process. This pre-processing of path information simplifies the real-time control requirements during measurement, reducing the computational complexity needed during the actual operation.
4Productivity
If the probe moves at constant high speed to improve productivity, then the measurement time is reduced, but the measurement precision deteriorates when deviating from the movement path in high curvature areas
Solution Approach 1:
The patent replaces constant speed movement with dynamic speed adjustment that adapts to the local curvature of the path. The system calculates the maximum allowable speed at each section based on curvature requirements, enabling the probe to maintain path following accuracy in high curvature areas while moving as fast as possible in low curvature areas, thus optimizing both precision and productivity.
Data Source
AI summary
A control method of a shape measuring apparatus divides a curve indicating a movement path of a probe into a plurality of sections. A measurement target section is selected from the plurality of sections sequentially from a starting point side of the curve indicating the movement path of the probe. A first curvature radius is calculated from a curvature of the measurement target section. A second curvature radius is calculated according to an angle between a first straight line connecting a starting point to an ending point of the measurement target section and a second straight line connecting a starting point to an ending point of a section next to the measurement target section. A smaller value from among the first curvature radius and the second curvature radius is set as an effective radius. A maximum speed of probe movement increasing according to an increase in the effective radius is calculated for the measurement target section.