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research-article

Vision-based Modal Analysis Using Multiple Vibration Distribution Synthesis to Inspect Large-Scale Structures

[+] Author and Article Information
Tadayoshi Aoyama

Assistant Professor, Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 4648603, Japan
tadayoshi.aoyama@mae.nagoya-u.ac.jp

Liang Li

Process Control Systems Software Design Department, Hitachi High-Technologies Corporation, Tokyo, 1058717, Japan
liang.li.fg@hitachi-hightech.com

Mingjun Jiang

Designated Assistant Professor, Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima, Hiroshima, 7898527, Japan
m-jiang@robotics.hiroshima-u.ac.jp

Takeshi Takaki

Associate Professor, Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima, Hiroshima, 7898527, Japan
takaki@robotics.hiroshima-u.ac.jp

Idaku Ishii

Professor, Department of System Cybernetics, Hiroshima University, Higashi-Hiroshima, Hiroshima, 7898527, Japan
iishii@robotics.hiroshima-u.ac.jp

Hua Yang

Associate Professor, State Key Laboratory of Digital Manufacturing, Equipment and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
huayang@hust.edu.cn

Chikako Umemoto

Keisoku Research Consultant Co., Hiroshima, Hiroshima, 732-0029, Japan
chikakoh@krcnet.co.jp

Hiroshi Matsuda

1-14 Bunkyo-cho Nagasaki, Nagasaki 8528521 Japan
matsuda@nagasaki-u.ac.jp

Makoto Chikaraishi

1-5-1 Kagamiyama Higashi-Hiroshima, Hiroshima 7398529 Japan
chikaraishim@hiroshima-u.ac.jp

Akimasa Fujiwara

1-5-1 Kagamiyama Higashi-Hiroshima, Hiroshima 7398529 Japan
afujiw@hiroshima-u.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4041604 History: Received October 02, 2017; Revised September 12, 2018

Abstract

Previously, we proposed a multithread active vision system with virtual multiple pan-tilt tracking cameras by rapidly switching the viewpoints for the vibration sensing of large-scale structures. We also developed a system using a galvanometer mirror that can switch 500 different viewpoints in one second. However, the measurement rate of each observation point is low and the time density is not always sufficient. In addition, strong multiple illuminations are required for the system owing to the retro reflective markers attached to the object being observed. In this study, we propose a multiple vibration distribution synthesis method for vibration analysis that increases the sampling rate of each observation point in the multithread active vision system, which is subsequently modified to a system that requires only one illumination by using corner cubes as markers. Several dynamics-based inspection experiments are conducted for a 4 m long truss-structure bridge model. The proposed method and system are verified via a high-order modal analysis, which was impossible to perform in the previous method and system.

Copyright (c) 2018 by ASME
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