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Integrating a hive triangle pattern with subpixel analysis for noncontact measurement of structural dynamic response
Yung-Chi Lu1, Shih-Lin Hung1, Tzu-Hsuan Lin2
1Department of Civil Engineering, National Chiao-Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
Thescientificworldjournal
|June 24, 2014
Summary
This study introduces a novel digital image processing method using a hive triangle pattern for precise, noncontact measurement of structural dynamics. The approach demonstrated high accuracy, with experimental errors below 0.007% for frequency and 0.0205% for displacement.
Area of Science:
- Structural Dynamics
- Digital Image Processing
- Noncontact Measurement
Background:
- Accurate measurement of structural dynamic response is crucial for engineering.
- Traditional methods can be intrusive or limited in scope.
- Digital image processing offers a promising noncontact alternative.
Purpose of the Study:
- To develop and validate a digital image processing approach for noncontact measurement of structural dynamic response.
- To integrate subpixel analysis with a unique hive triangle pattern for enhanced accuracy.
- To assess the feasibility and precision of the proposed method through simulation and experimentation.
Main Methods:
- A digital image processing technique utilizing a hive triangle pattern and subpixel analysis was developed.
- Numerical simulations of a photography experiment were conducted to demonstrate feasibility.
- Experimental validation involved a three-story frame on a shaker table, with data compared against a linear variable differential transformer (LVDT).
Main Results:
- Numerical simulations showed good correlation between measured and numerical displacement time-histories.
- Experimental results indicated a relative error below 0.007% for frequency and 0.0205% for displacement when compared to LVDT data.
- The study identified that the image block size significantly impacts measurement accuracy.
Conclusions:
- The proposed digital image processing approach with a hive triangle pattern is effective for noncontact measurement of structural dynamic response.
- The method achieves high accuracy, validated by experimental data.
- The developed approach for evaluating pattern center and size is crucial for adaptive block assignment in digital image correlation, enhancing measurement precision.
