Load Cell Alignment for Testing Machine Specimen
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Solution Overview
Problem
Existing test machines face challenges with specimen alignment, leading to potential damage and incorrect measurements due to misalignment.
Innovation Solution
The method involves obtaining sensor outputs from load cells at both ends of a test specimen to determine forces and misalignment, allowing for coaxial alignment by adjusting the alignment device or specimen position within the grips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional testing machine alignment methods are used, then the device complexity is low, but the measurement precision and reliability deteriorate due to misalignment causing specimen damage and incorrect measurements
Solution Approach 1:
The patent implements feedback by using load cells to continuously measure lateral forces during testing, providing real-time information about alignment status. The system uses these measurements to detect misalignment and trigger adjustments, creating a closed-loop control system that maintains precise alignment throughout the test process
Solution Approach 2:
The patent replaces traditional mechanical alignment methods with sensor-based detection. Instead of relying solely on mechanical alignment devices and visual inspection, the system uses load cells to electronically detect lateral forces, enabling more precise and automated alignment control
2Reliability
If alignment devices and adjustment mechanisms are added to improve alignment, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system uses load cells to provide continuous feedback on lateral forces, enabling real-time detection of alignment issues. This feedback mechanism allows the system to maintain high reliability by automatically detecting and correcting misalignment without requiring complex manual intervention systems
Solution Approach 2:
The alignment system performs self-diagnosis through the load cells that continuously monitor lateral forces. When misalignment is detected, the system can automatically trigger adjustments, reducing the need for external monitoring and intervention, thereby improving reliability without proportionally increasing complexity
3Measurement precision
If lateral force measurements are implemented to detect misalignment, then measurement precision improves, but device complexity increases due to additional sensors
Solution Approach 1:
The load cells serve multiple functions: they measure both the primary axial test forces and the secondary lateral alignment forces. This multi-functionality allows the system to detect misalignment without adding separate dedicated sensors, thereby improving measurement precision while minimizing the increase in device complexity
Solution Approach 2:
The existing grip and load cell structure is designed to simultaneously handle both test loading and alignment measurement functions. By making the load cells sensitive to lateral forces in addition to axial forces, the system achieves precise misalignment detection without requiring separate measurement systems
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 approach ensures accurate alignment of the test specimen, reducing the risk of damage and improving measurement precision by minimizing lateral forces and adjusting the specimen's position within the grips.
Implementation Method 1
a set of first sensors configured to sense a first force in a first lateral direction orthogonal to the axis, and a set of second sensors configured to sense a second force in a second lateral direction orthogonal to the first lateral direction and orthogonal to the axis
Data Source
AI summary
A method of operating a testing machine includes obtaining first sensor outputs from a first load cell indicative of forces on sensors of the first load cell at a first end of a test specimen. The method further includes obtaining second sensor outputs from a second load cell indicative of forces on sensors of the second load cell at a second opposite end of the test specimen mounted in a second grip. Forces at the sensors of the first load cell and sensors of the second load cell are determined from the first sensor outputs and the second sensor outputs. The test specimen is coaxially aligned with the first and second grips along an axis by adjusting at least one of an alignment device of the testing machine or at least one of a position of the test specimen in the first or second grip.