首页|Non-contact measurement method of beam vibration with laser stripe tracking based on tilt photography
Non-contact measurement method of beam vibration with laser stripe tracking based on tilt photography
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NSTL
Elsevier
Aimed at the problems of strong dependence on target and light conditions in vision-based methods, a new method of analyzing bridge vibration by tracking a laser stripe is proposed. Specifically, the laser line is projected to the surface of the beam and continuous images are recorded. Through sub-pixel tracking of the laser stripe center-line position in the image, the bridge displacement time-history curve can be obtained, and then the dynamic parameters can be identified. A hammer impact test of a simply supported beam model was conducted in the laboratory. A Sony camera, a linear variable differential transformer displacement sensor, and seven accelerometers were used to collect data. The maximum error of displacement and maximum error of the first- and second-order frequencies obtained by the camera were 5.47% and 1.81%, respectively. Then, field tests of a track beam were conducted. This method provides a new non-contact technique for measuring bridge vibration.
NSTL
Elsevier
