Material Testing Machine Differential Displacement Graph
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Solution Overview
Problem
In high-speed tensile and compression tests, it is difficult to confirm whether the target test speed has been reached due to minute changes in displacement data and noise, making it challenging to determine the actual test speed from displacement or speed-time graphs.
Innovation Solution
A material testing machine that includes a differential displacement calculator to display a differential displacement graph, a point-of-interest detector to calculate a reference speed straight line, and a display controller to show auxiliary lines within the requested test range, enabling users to easily verify if the target test speed is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If displacement data is displayed in a conventional displacement-time graph, then the complete displacement information is shown, but it becomes difficult to confirm whether the target test speed has been reached due to minute changes and noise
Solution Approach 1:
The patent segments the displacement information by calculating differential displacement values that represent deviations from target displacement at each time point. This segmentation separates the speed verification information from the complete displacement data, allowing operators to quickly assess speed accuracy without being overwhelmed by minute displacement variations in the full displacement-time graph.
Solution Approach 2:
The patent introduces a new dimension of information representation by creating a differential displacement graph that plots deviation values against time. This transforms the one-dimensional displacement-time relationship into a two-dimensional representation that highlights speed verification information, making it easier to determine whether target speed was achieved without losing the underlying displacement data.
2Measurement precision
If the displacement graph is enlarged to show minute changes, then displacement details become visible, but the graph becomes complex and harder to interpret for speed verification
Solution Approach 1:
The patent extracts the speed verification information from the complete displacement graph by calculating differential values that represent only the deviation from target displacement. This extraction removes the complexity of interpreting minute displacement changes while preserving the essential speed verification data, allowing operators to focus on whether target speed was achieved without being distracted by unnecessary displacement details.
3Speed
If speed data is derived by differentiating displacement data, then speed information is obtained, but minute changes in displacement are enlarged into large speed variations that obscure the actual test speed
Solution Approach 1:
The patent applies preliminary anti-action by calculating differential displacement values that compensate for the amplification effect of differentiation. Instead of directly differentiating displacement data to obtain speed, the system calculates deviations from target displacement in a way that counteracts the tendency to amplify noise, thereby providing reliable speed verification information that is not distorted by minute displacement variations.
Data Source
AI summary
A material testing machine is provided. The material testing machine includes a force detector that detects the testing force that acts on the target to be tested; a displacement detector that detects displacement generated in the target to be tested; and a controller that controls the load mechanism. The controller includes: a differential displacement calculator that obtains a differential displacement value from a value of the displacement detected by the displacement detector and a target displacement value that has been set in advance as a test condition; and a display controller that displays, on a display device, a differential displacement graph indicating, in a form of a graph, time-series data of the differential displacement value calculated by the differential displacement calculator.