scholarly journals Damage Characterization of Bio and Green Polyethylene–Birch Composites under Creep and Cyclic Testing with Multivariable Acoustic Emissions

Materials ◽  
2015 ◽  
Vol 8 (11) ◽  
pp. 7322-7341 ◽  
Author(s):  
Alencar Bravo ◽  
Lotfi Toubal ◽  
Demagna Koffi ◽  
Fouad Erchiqui
Keyword(s):  
Acoustic Emissions ◽  
Cyclic Testing ◽  
Damage Characterization

Damage characterization of aluminum 2024 thin sheet for different stress triaxialities

2018 ◽  
Vol 18 (3) ◽  
pp. 702-712 ◽  
Author(s):  
G.H. Majzoobi ◽  
M. Kashfi ◽  
N. Bonora ◽  
G. Iannitti ◽  
A. Ruggiero ◽  
...  
Keyword(s):  
Thin Sheet ◽  
Damage Characterization

Damage characterization of surface and sub-surface defects in stitch-bonded biaxial carbon/epoxy composites

2014 ◽  
Vol 56 ◽  
pp. 821-829 ◽  
Author(s):  
Masoud Yekani Fard ◽  
Seid Mohammadali Sadat ◽  
Brian B. Raji ◽  
Aditi Chattopadhyay
Keyword(s):  
Surface Defects ◽  
Epoxy Composites ◽  
Damage Characterization

scholarly journals A Minimal Metric for the Characterization of Acoustic Noise Emitted by Underwater Vehicles

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6644
Author(s):  
Giacomo Picardi ◽  
Clara Borrelli ◽  
Augusto Sarti ◽  
Giovanni Chimienti ◽  
Marcello Calisti
Keyword(s):  
Acoustic Noise ◽  
Acoustic Emissions ◽  
Remotely Operated Vehicles ◽  
Underwater Robots ◽  
Acoustic Disturbance ◽  
Marine Fauna ◽  
Acoustic Data

Underwater robots emit sound during operations which can deteriorate the quality of acoustic data recorded by on-board sensors or disturb marine fauna during in vivo observations. Notwithstanding this, there have only been a few attempts at characterizing the acoustic emissions of underwater robots in the literature, and the datasheets of commercially available devices do not report information on this topic. This work has a twofold goal. First, we identified a setup consisting of a camera directly mounted on the robot structure to acquire the acoustic data and two indicators (i.e., spectral roll-off point and noise introduced to the environment) to provide a simple and intuitive characterization of the acoustic emissions of underwater robots carrying out specific maneuvers in specific environments. Second, we performed the proposed analysis on three underwater robots belonging to the classes of remotely operated vehicles and underwater legged robots. Our results showed how the legged device produced a clearly different signature compared to remotely operated vehicles which can be an advantage in operations that require low acoustic disturbance. Finally, we argue that the proposed indicators, obtained through a standardized procedure, may be a useful addition to datasheets of existing underwater robots.

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