Measuring Machine Bed Deformation Compensation
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Solution Overview
Problem
Current compensation techniques for measuring machines do not account for measurement errors caused by variable elastic deformations of the machine bed due to the load exerted by the mobile unit, leading to non-negligible measurement inaccuracies.
Innovation Solution
A method that includes determining and storing deformation effects of the machine bed caused by the mobile unit's load using numeric simulation or experimental methods, integrating this data into a compensation map to correct for pitch and roll rotations of the workpiece, enabling precise compensation of measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current static compensation techniques are used, then device complexity is reduced, but measurement precision deteriorates due to unaccounted deformation-induced errors
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing deformation compensation values in lookup tables for various mobile unit positions. The FEM model computes deformation effects beforehand, and the pre-compensated coordinates are stored for rapid retrieval during measurement, avoiding real-time complex calculations while maintaining high precision
Solution Approach 2:
The patent replaces the need for complex real-time mechanical measurement compensation with a computational approach using FEM models and pre-computed lookup tables. This substitutes dynamic mechanical correction systems with static computational data structures, reducing device complexity while improving measurement precision
2Measurement precision
If deformation compensation is implemented, then measurement precision improves, but computing time increases due to FEM simulations
Solution Approach 1:
The patent performs FEM deformation simulations and compensation calculations in advance, storing results in lookup tables. During actual measurement operations, the system simply retrieves pre-computed compensation values based on mobile unit position, eliminating the need for real-time FEM simulations and significantly reducing computing time
Solution Approach 2:
The patent implements a dynamic compensation approach where the lookup tables are generated once offline using FEM simulations, but then used dynamically during measurement by simply indexing into the tables based on current position. This separates the computationally intensive simulation phase from the rapid measurement phase
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 method effectively reduces measurement errors by accounting for the deformation-induced attitude variations of the workpiece, improving measurement accuracy by integrating deformation data into the machine's compensation system.
Implementation Method 1
variable elastic deformations of the machine bed arise on account of the loads exerted on the machine bed by the mobile unit of the machine
Data Source
AI summary
A method of compensating the measurement errors of a measuring machine deriving from the deformations of a machine bed of the machine caused by the load exerted by a mobile unit of the machine on said machine bed, said method being characterized by comprising a first acquisition step in which first data regarding the constraint conditions of a workpiece on the machine bed are acquired, a second acquisition step in which second data regarding the deformation of the machine bed as the position of the mobile unit of the machine varies are acquired, and a third calculation step in which correction values depending upon said first and second data are calculated.