Vibration displacement measurement technology for cylindrical structures using camera images

Cylindrical Permanent-Magnet Structures Using Images in an Iron Shield

We report on cylindrical permanent-magnet structures that exploit the image effect in a surrounding circular soft-iron sheath. We present the theory for a general multipole ring, where the polarization direction = ( + 1) is a positive or negative integer, and is the angular coordinate. For the uniformly magnetized case = 1, a long cylindrical ring produces no field in its bore, and the field ou...

Video Camera–Based Vibration Measurement for Civil Infrastructure Applications

Visual testing, as one of the oldest methods for nondestructive testing (NDT), plays a large role in the inspection of civil infrastructure. As NDT has evolved, more quantitative techniques have emerged such as vibration analysis. New computer vision techniques for analyzing the small motions in videos, collectively called motion magnification, have been recently developed, allowing quantitativ...

Torsional and Bending Vibration Measurement on Rotors Using Laser Technology

Non-destructive Method for Estimating Biomass of Plants Using Digital Camera Images

Abstract Plant growth and biomass assessments are required in production and research. Such assessments are followed by major decisions (e.g., harvest timing) that channel resources and influence outcomes. In research, resources required to assess crop status affect other aspects of experimentation and, therefore, discovery. Destructive harvests are important because they influence treatment s...

On the Free Vibration Behavior of Cylindrical Shell Structures

Shell structures, especially cylindrical shells, are widely used in aerospace and naval architectural industries. Submarine hulls and aircraft bodies can be idealized as cylindrical shell structures. The study of vibrations of cylindrical shells is an important aspect in the successful applications of the cylindrical shells. The free vibration characteristics of a submarine hull have an importa...