Dynamic deformation measurement and analysis of active stressed lap using optical method

2007 ◽  
Author(s):  
Qican Zhang ◽  
Xianyu Su ◽  
Yuankun Liu ◽  
Liqun Xiang
Keyword(s):  
Optical Method ◽  
Dynamic Deformation ◽  
Deformation Measurement ◽  
Measurement And Analysis

Study on Mechanical Properties of the Composite Materials Film by Speckle Projection Method

2012 ◽  
Vol 496 ◽  
pp. 281-284
Author(s):  
Wen Wen Liu ◽  
Zhi Wang ◽  
Yun Hai Du ◽  
Xian Zhong Xu ◽  
Da Quan Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Projection Method ◽  
Dynamic Deformation ◽  
Calibration Method ◽  
Deformation Measurement ◽  
Lens Distortion

An improved accurate speckle projection method is used for study the mechanical properties of the composite material film in the paper. A system for deformation measurement is developed with the telecentric lenses, in which such conventional lens’ disadvantages such as lens distortion and perspective error will be diminished. Experiments are performed to validate the availability and reliability of the calibration method. The system can also be used to measure the dynamic deformation and then results are also given.

The Deformation Measurement and Analysis on Meso-Structure of Aluminum Foams During SHPB Test

2014 ◽  
Vol 42 (3) ◽  
pp. 20120254 ◽  
Author(s):  
Bao Yang ◽  
Liqun Tang ◽  
Yiping Liu ◽  
Zejia Liu ◽  
Zhenyu Jiang ◽  
...  
Keyword(s):  
Deformation Measurement ◽  
Aluminum Foams ◽  
Measurement And Analysis ◽  
Shpb Test

scholarly journals Dynamic Deformation Measurement by the Sampling Moiré Method from Video Recording and its Application to Bridge Engineering

2020 ◽  
Vol 44 (3) ◽  
pp. 313-327 ◽  
Author(s):  
S. Ri ◽  
H. Tsuda ◽  
K. Chang ◽  
S. Hsu ◽  
F. Lo ◽  
...  
Keyword(s):  
Field Experiment ◽  
Natural Frequency ◽  
Large Scale ◽  
Dynamic Deformation ◽  
Imaging Techniques ◽  
Video Recording ◽  
Deformation Measurement ◽  
Displacement Sensor ◽  
Microwave Radar ◽  
Moire Method

AbstractMeasuring accurate dynamic deformation distribution for large-scale structures inexpensively and efficiently is a crucial challenge of structural health monitoring. In this study, a simple technique for measuring the deflection and vibration frequency from a captured video, based on the sampling Moiré method is developed. The striking advantage over conventional measurement using sensors and other imaging techniques are that the developed technique allows accurate measurement of two-dimensional deformations at multiple locations as well as the natural frequency of the target structure. Joint Photographic Experts Group (JPEG)-formatted images encoded from the recorded video with Motion-JPEG (MJPEG) format reduced the file size significantly without degrading the measurement accuracy and applied to deformation measurement. The effectiveness of the developed technique was confirmed through a field experiment of an old bridge in Taiwan. The field experiment demonstrated that both deflection and natural frequency of the bridge were successfully measured with higher 0.1 mm displacement accuracy and 0.05 Hz frequecy comparable to a conventional microwave radar displacement sensor from 20 m distance.

3919 Dynamic Deformation Measurement of a Golf Ball during Normal Impact

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 869-870
Author(s):  
Kazuo ARAKAWA ◽  
Toshio MADA ◽  
Haruo KOMATSU ◽  
Tetsuo SHIMIZU ◽  
Masanori SATOU ◽  
...  
Keyword(s):  
Dynamic Deformation ◽  
Deformation Measurement ◽  
Golf Ball ◽  
Normal Impact
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