scholarly journals Corrigendum to Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

2021 ◽  
pp. 136943322199912
Keyword(s):  
Contact Stiffness ◽  
Initial Response ◽  
Response Mechanism ◽  
Two Stage ◽  
Stiffness Analysis ◽  
Local Contact ◽  
Collision Prevention ◽  
Prevention System

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

2021 ◽  
pp. 136943322098610
Author(s):  
Kai Lu ◽  
Xu-Jun Chen ◽  
Zhen Gao ◽  
Liang-Yu Cheng ◽  
Guang-Huai Wu
Keyword(s):  
Kinetic Energy ◽  
Impact Force ◽  
Contact Stiffness ◽  
Impact Angle ◽  
Bridge Pier ◽  
Two Stage ◽  
Collision Prevention ◽  
Prevention System ◽  
The Impact ◽  
Depth Curves

A floating two-stage buffer collision-prevention system (FTBCPS) has been proposed to reduce the impact loads on the bridge pier in this paper. The anti-collision process can be mainly divided into two stages. First, reduce the ship velocity and change the ship initial moving direction with the stretching and fracture of the polyester ropes. Second, consume the ship kinetic energy with the huge damage and deformation of the FTBCPS and the ship. The main feature of the FTBCPS lies in the first stage and most of the ship kinetic energy can be dissipated before the ship directly impacts on the bridge pier. The contact stiffness value between the ship and the FTBCPS can be a significant factor in the first stage and the calculation method of it is the focus of this paper. The contact force, the internal force and the general equation of motion have been given in the first part. The structure model of the ship and the FTBCPS are then established in the ANSYS Workbench. After that, 38 typical load cases of the ship impacting on the FTBCPS are conducted in LS-DYNA. The reduction processes of the ship kinetic energy and the ship velocity in different load cases have been investigated. It can be summarized that the impact angle and the ship initial velocity are the main factors in the energy and velocity dissipation process. Moreover, the local impact force-depth curves have also been studied and the impact angle is found to be the only significant factor on the ship impact process. Next, the impact force-depth curves with different impact angles are fitted and the contact stiffness values are accordingly calculated. Finally, the impact depth range, the validity of the local simulation results and the consistency of the fitted stiffness value are verified respectively, demonstrating that the fitted stiffness values are applicable in the global analysis.

Detection of Similar Elastic Properties Using a Magnetic Force Controlled Afm

1996 ◽  
Vol 436 ◽  
Author(s):  
Shin-Ichi Yamamoto ◽  
Hirofumi Yamada ◽  
Suzanne P. Jarvis ◽  
Makoto Motomatsu ◽  
Hiroshi Tokumoto
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Elastic Properties ◽  
Magnetic Force ◽  
Contact Stiffness ◽  
Regional Variations ◽  
Young’S Moduli ◽  
Local Contact ◽  
Applied Forces ◽  
Afm Cantilever

AbstractWe have investigated regional variations of elastic properties using a magnetic force controlled AFM. A piece of small magnet was fixed at the end of the backside of the AFM cantilever so as to apply forces directly to the tip through the external magnetic field of an electromagnet. By modulating the applied forces to the tip and measuring the resulting amplitude of oscillation, a sensitive measurement of the local contact stiffness can be made. We have applied this technique to phase-separated films of polystyrene/polymethylmethacrylate (PS-PMMA) which have almost identical Young's moduli.

Low-Cost, Non-centralized, Vehicle Collision Prevention System

2015 ◽  
pp. 239-255
Author(s):  
Mamoun F. Abdel-Hafez ◽  
Ibrahim Muhammad ◽  
Kamal M. Saadeddin ◽  
Amer A. Al-Radaideh
Keyword(s):  
Low Cost ◽  
Vehicle Collision ◽  
Collision Prevention ◽  
Prevention System

scholarly journals Effect of microstructure on short pulse duration shock initiation of TATB and initial response mechanism

2020 ◽  
Vol 16 (2) ◽  
pp. 374-380
Author(s):  
Jun Wang ◽  
Wei Cao ◽  
Xiang-li Guo ◽  
Bi-bo Cheng ◽  
Lu-lu Zhao ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Short Pulse ◽  
Initial Response ◽  
Response Mechanism ◽  
Shock Initiation ◽  
Short Pulse Duration ◽  
Effect Of Microstructure

scholarly journals A Two-stage Micropropagation System for Cranberries

1991 ◽  
Vol 116 (5) ◽  
pp. 911-916 ◽  
Author(s):  
Michael Marcotrigiano ◽  
Susan P. McGlew
Keyword(s):  
Adventitious Shoot ◽  
Initial Response ◽  
Shoot Formation ◽  
Two Stage ◽  
Axillary Shoots ◽  
Adventitious Shoot Formation ◽  
Explant Source ◽  
Micropropagated Plants ◽  
Low Levels ◽  
Shoot Tip Explants

A two-stage micropropagation system was devised for cranberries (Vaccinium macrocarpon Ait.). Shoot-tip explants taken from four cultivars of greenhouse-grown plants were placed on media composed of Anderson's major salts, Murashige and Skoog's (MS) minor salts and organics, plus various concentrations of 2iP, IBA, and GA3. In other experiments, explant source, salt formulations for media, and rooting treatments were studied. Optimal multiplication and shoot quality occurred when nodal explants taken from greenhouse-grown or micropropagated plants were placed on medium containing 150 μm 2iP, 1.0 μm IBA, and no GA3. Histological examination revealed that the initial response of nodes to culture is axillary bud proliferation, but adventitious shoot formation occurred after 4 to 6 weeks. Cultures that contained only axillary shoots were not evident unless low levels of 2iP were used, at which point only axillary buds present on the explants were released. Proliferated shoots could be rooted ex vitro without auxin treatment. Optimal rooting occurred under high-light conditions. Plants were transplanted to the field for comparison to conventionally propagated material. Chemical names used: gibberellic acid (GA3), N-(3-methyl-2-butenyl)-1H-purin-6-amine (2iP), 1H-indole-3-butanoic acid (IBA).

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