High-Speed Tensile Testing Control for Natural Frequency Tracking
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Solution Overview
Problem
In high-speed tensile testing machines, the natural frequency of the machine body can change due to gripper replacement or test piece size variations, complicating the association of test results with natural frequency measurements, especially for unskilled operators.
Innovation Solution
A tensile testing machine and method that includes a determination unit for applying a striking force, a detection unit for vibration detection, a calculation unit for natural frequency calculation, and a recording unit for associating test results with natural frequency information, either before or after the tensile test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If natural frequency measurement is performed manually by operators, then measurement capability is achieved, but operation complexity increases and ease of operation deteriorates
Solution Approach 1:
The tensile testing machine automatically performs natural frequency measurement and associates it with test results without requiring operator intervention. The system self-measures the natural frequency by applying a striking force to the machine body, detects the vibration, calculates the frequency, and links it to the test result automatically, eliminating the need for manual measurement and association work by operators.
Solution Approach 2:
The natural frequency measurement is performed automatically as a preliminary action before or after the tensile test. The system proactively measures the natural frequency in advance (or immediately after) so that the data is ready and automatically associated when the test is conducted, eliminating the need for operators to manually perform measurements and match results later.
2Ease of operation
If natural frequency measurement and test result association are automated, then ease of operation improves, but device complexity increases
Solution Approach 1:
The control unit of the tensile testing machine is designed to perform multiple functions: it controls the tensile test, applies the striking force for natural frequency measurement, detects the vibration response, calculates the natural frequency, and associates the results. By making the control unit multi-functional, the patent avoids adding separate dedicated devices for each function, thereby limiting the increase in overall device complexity while achieving full automation.
3Productivity
If high-speed tensile testing is performed with short data collection cycles, then productivity increases, but measurement precision deteriorates due to resonance interference
Solution Approach 1:
The system measures the natural frequency of the machine body and uses this information as feedback to understand the resonance characteristics. By knowing the natural frequency, the system can account for resonance effects when analyzing test data, thereby maintaining measurement precision even during high-speed testing with short data collection cycles.
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
Facilitates easy association of tensile test results with natural frequency measurements, simplifying the process for operators and ensuring accurate data recording.
Implementation Method 1
a striking structure (60) that applies the striking force to the tensile testing machine body at the timing determined by the determination unit (513)
Implementation Method 2
a first detection unit (514) that detects a vibration of the tensile testing machine body generated by the striking force
Implementation Method 3
a calculation unit (515) that calculates a natural frequency of the tensile testing machine on the basis of a detection result of the first detection unit (514)
Data Source
AI summary
A test result of a tensile test and a measurement result of a natural frequency are easily associated with each other. A high-speed tensile testing machine 1 is a tensile testing machine that executes a tensile test by applying a test force F to a test target TP. The machine includes: a determination unit 513 that determines a timing at which a striking force FD is applied to a testing machine body 2; a striking structure 60 that applies the striking force FD to the testing machine body 2 at the timing determined by the determination unit 513; a first detection unit 514 that detects a vibration of the testing machine body 2 generated by the striking force FD; a calculation unit 515 that calculates a natural frequency FA of the high-speed tensile testing machine 1 on the basis of a detection result of the first detection unit 514; an execution instruction unit 516 that executes the tensile test; and a recording unit 517 that writes, in a result storage unit 518, information indicating a test result of the tensile test in association with information indicating the natural frequency FA. The timing is included in either before or after the tensile testing machine 1 executes the tensile test.