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8 results on '"strength classification"'

1. Aircraft Wake Recognition and Strength Classification Based on Deep Learning

Author

Chun Shen, Weiwei Tang, Hang Gao, Xuesong Wang, Pak-Wai Chan, Kai-Kwong Hon, and Jianbing Li

Subjects
Air traffic management (ATM), deep learning, recognition, strength classification, wake vortex, YOLOv5s network, Ocean engineering, TC1501-1800, Geophysics. Cosmic physics, QC801-809
Abstract

Aircraft wake is a pair of counter-rotating vortices generated behind the aircraft, which can greatly impact the safety of fast takeoff and landing of aircraft and limit the improvement of airport capacity. The current wake parameter retrieval methods cannot locate the wake vortex's position and estimate its strength level in real time. To deal with this issue, a novel algorithm based on the YOLOv5s deep learning network is proposed. The new algorithm establishes a single vortex locating concept to adapt the wake vortex's evolution at complicate background wind field conditions, and proposes strength-based classification standard which can represent the real-time hazard of wake vortex to shorten the takeoff and landing intervals. Meanwhile, the EIOU loss function is introduced to improve the precision of YOLOv5s network. Compared with the state-of-the-art object detection approaches, such as Cascade R-CNN, FCOS, and YOLOv5l, the superiority of new method is demonstrated in terms of accuracy and robustness by using the field detection data from Hong Kong International Airport.

Published
2023
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3. The importance of characterisation and sampling of tropical wood species with regard to strength and durability classification

Author

Ravenshorst, G. J. P., Gard, W. F., and Kuilen, J. W. G. V.

Subjects
durability classification, Tropical wood species, strength classification
Abstract

Strength class assignments and durability class assignments of wood species to be used in structures are necessary to make it possible for the engineer to design safe and durable timber structures. As a result of sustainable managed forests, more tropical wood species with relative small batch size, are coming on the market. In Europe, strength class and durability class assignments are allocated to wood species, identified by their botanical name. In practice this gives problems because the trade names may not represent the botanical wood species and the representativeness of the underlying tests is unclear. The objective of this paper is to start a discussion on the classification and sampling of structural timber for strength and durability. It is proposed to make classifications based on measurable characteristics of the timber, independent from tree species.

Published
2013

4. The importance of characterisation and sampling of tropical wood species with regard to strength and durability classification

Subjects
durability classification, Tropical wood species, strength classification
Abstract

Strength class assignments and durability class assignments of wood species to be used in structures are necessary to make it possible for the engineer to design safe and durable timber structures. As a result of sustainable managed forests, more tropical wood species with relative small batch size, are coming on the market. In Europe, strength class and durability class assignments are allocated to wood species, identified by their botanical name. In practice this gives problems because the trade names may not represent the botanical wood species and the representativeness of the underlying tests is unclear. The objective of this paper is to start a discussion on the classification and sampling of structural timber for strength and durability. It is proposed to make classifications based on measurable characteristics of the timber, independent from tree species.

Published
2013

6. The importance of characterisation and sampling of tropical wood species with regard to strength and durability classification

Author

Ravenshorst, G.J.P. (author), Gard, W.F. (author), Van de Kuilen, J.W.G. (author), Ravenshorst, G.J.P. (author), Gard, W.F. (author), and Van de Kuilen, J.W.G. (author)

Abstract

Strength class assignments and durability class assignments of wood species to be used in structures are necessary to make it possible for the engineer to design safe and durable timber structures. As a result of sustainable managed forests, more tropical wood species with relative small batch size, are coming on the market. In Europe, strength class and durability class assignments are allocated to wood species, identified by their botanical name. In practice this gives problems because the trade names may not represent the botanical wood species and the representativeness of the underlying tests is unclear. The objective of this paper is to start a discussion on the classification and sampling of structural timber for strength and durability. It is proposed to make classifications based on measurable characteristics of the timber, independent from tree species., Structural Engineering, Civil Engineering and Geosciences

Published
2013

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