Mechanical Testing System Compliance Error Compensation
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Solution Overview
Problem
Mechanical testing systems face errors in measuring material properties due to the compliance of the testing device itself, which is not accurately accounted for in existing systems, leading to incorrect measurements of specimen deflection and stiffness.
Innovation Solution
A method involving a mechanical testing system with a computing system that applies loads to a reference sample, calculates transfer functions to create filters for load and displacement signals, and determines a compensated value by comparing load and displacement compensation values to correct for the testing device's compliance, thereby providing accurate specimen deflection measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mechanical testing system components are subjected to applied loads during testing, then the testing can be performed, but measurement errors occur due to system compliance
Solution Approach 1:
The system performs preliminary characterization of the testing device compliance using a reference sample before actual specimen testing. The transfer function is calculated and filters are created in advance to compensate for system compliance effects, ensuring accurate measurements during subsequent testing operations
Solution Approach 2:
The system uses feedback from load and displacement measurements on a reference sample to automatically calculate system compliance characteristics. This feedback information is then used to create correction filters that compensate for system compliance effects in real-time during specimen testing, improving measurement accuracy
2Measurement precision
If traditional mechanical testing systems measure deflection directly, then testing is simple, but the measured deflection includes both specimen and system compliance effects
Solution Approach 1:
A reference sample serves as an intermediary to characterize the testing system's compliance properties. By measuring the response of this known reference sample, the system determines its own transfer function, which then acts as a mediator to correct subsequent measurements of unknown specimens, separating specimen deflection from system compliance effects
Solution Approach 2:
The system replaces direct mechanical deflection measurement with a computational approach using transfer functions and digital filters. Instead of relying solely on mechanical measurement, the system uses signal processing to subtract system compliance effects from the measured response, achieving more precise specimen deflection measurements
Data Source
AI summary
An error compensation system and method may include applying a mechanical load to a reference sample to obtain a load measurement signal from the load sensor and a displacement measurement signal from the displacement sensor, calculating a transfer function to create a load filter and a displacement filter to be applied to the load measurement signal and the displacement measurement signal, respectively, applying the load filter to the load measurement signal to calculate a load compensation value, and applying the displacement filter to the displacement measurement signal to calculate a displacement compensation value, and determining the compensated value by comparing the load compensation value with the displacement compensation value, wherein the compensated value is determined prior to testing a specimen so that the compensated value is used to automatically correct a measured deflection of the specimen to arrive at an actual specimen deflection.