Results 41 to 50 of about 2,453 (294)

Defect Detection in Concrete Structures Based on Characteristics of Hammer Reaction Force and Apparent Stiffness of Concrete

IEEE Access
Concrete structures play a vital role in civil engineering. However, their deterioration poses a significant safety risk, making regular inspection essential.
Koki Shoda, Jun Younes Louhi Kasahara, Qi An, Atsushi Yamashita   +3 more
doaj   +1 more source

Development of quadruped robot for inspection of underground pipelines in nuclear power plants

Electronics Letters, 2022
Structural integrity of seawater pipelines in nuclear power plants is a very important issue. In accordance with the operating technical guidelines, the human operators directly enter the pipe and inspect it at every maintenance test.
Youhyun Jang, Woojin Seol, Kooksun Lee, Kyung‐Soo Kim, Soohyun Kim   +4 more
doaj   +1 more source

Significance of Visutal Test and Hammering Test to Manage Concrete Structure Durabilty [PDF]

, 2008
Inspection of reinforced concrete is important to ensure durability, and visual test and hammering test are widely applied to the inspection. In this study, reliability on the result of the visual test for cold joint and sand streak and the hammering ...
Sasaki, Noriaki, Tsuji, Masanori, Mita, Katsuya   +2 more
core  

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Void topology identification analysis in structures based on weighted sensitivity method (Study on oscillation control of sensitivity for iteration-axis direction by change of numerical parameters)

Nihon Kikai Gakkai ronbunshu
In this paper, we present a void topology identification analysis in structures based on the level-set-based topology optimization using a weighted sensitivity method.
Takahiko KURAHASHI, Towa KOIKE, Akihiro TAKEMORI, Masayuki KISHIDA   +3 more
doaj   +1 more source

Analysis on the lateral vibration of drill string by mass effect of drilling fluid [PDF]

Mechanical Sciences, 2019
It is well known that the influence of the internal and external drilling fluid on the lateral vibration characteristics of drillstring cannot be ignored. In this paper, experiment apparatus for simulating drillstring vibration was established. Hammering
C. Yang, C. Yang, R. Wang, L. Han, Q. Xue   +4 more
doaj   +1 more source

Inverse analysis for Identification of Hammering Signal in Non-destructive Hammering Test [PDF]

, 2016
In this study, we present the inverse analysis for identification of hammering signal in non-destructive hammering test. As the observation value, the observed voltage from microphone is transformed to sound pressure level, and the performance function ...
松岡, 瑛喜, 倉橋, 貴彦, 井山, 徹郎, Toyama, Shigehiro, Ikeda, Fujio, 村上, 祐貴, 田原, 喜宏, Kurahashi, Takahiko, Murakami, Yuki, Tawara, Yoshihiro, 池田, 富士雄, 外山, 茂浩, Matsuoka, Eiki, Iyama, Tetsuro   +13 more
core  

Experimental and Numerical Modal Analysis of Composite Sandwich Structures Using Surfboards as Model Systems

Advanced Engineering Materials, EarlyView.
This article presents an experimental and numerical modal investigation of composite sandwich structures using surfboards as model systems. By comparing different core materials and reinforcement strategies, the study demonstrates how local stiffeners influence vibrational response and introduce characteristic modal features, highlighting modal ...
Brett Connellan, Luca Lomazzi, Mathis Mercier, Kara Stark, Marc in het Panhuis   +4 more
wiley   +1 more source

Estimation method of surface texture parameters by inverse analysis of dynamic characteristics

Mechanical Engineering Journal, 2017
The surface texture describes the surface topography formed by micro asperities on a surface of a solid member. The Hertz-Mindlin theory is one of contact theories based on the mechanics of elasticity. The main parameters for the theory are the number of
Yoshinao KISHIMOTO, Yukiyoshi KOBAYASHI, Toshihisa OHTSUKA, Motoi NIIZUMA   +3 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source