[ITAL]Hubble[/ITAL] [ITAL]Space[/ITAL] [ITAL]T[/ITAL][ITAL]elescope[/ITAL] Detection of Optical Companions of WR 86, WR 146, and WR 147: Wind Collision Model Confirmed

1998 ◽  
Vol 115 (5) ◽  
pp. 2047-2052 ◽  
Author(s):  
Virpi S. Niemela ◽  
Michael M. Shara ◽  
Debra J. Wallace ◽  
David R. Zurek ◽  
Anthony F. J. Moffat
Keyword(s):  
Collision Model

Modelling and simulation of ship collisions in port and coastal waters

2021 ◽  
pp. 147509022198918
Author(s):  
Chien-Chang Chou
Keyword(s):  
Coastal Waters ◽  
Maritime Transportation ◽  
Critical Factors ◽  
Ship Maneuvering ◽  
Collision Model ◽  
The Past ◽  
Sea Current ◽  
Ship Collision ◽  
Comparison Of The Results ◽  
Collision Models

Navigational safety is an important issue in maritime transportation. The most frequent type of maritime accident in the port and coastal waters is the ship collision. Although some ship collision models have been developed in the past, few have taken account of wind and sea current effects. However, wind and sea current are critical factors in ship maneuvering. Therefore, based on the previous collision model without wind and sea current effects, this study further develops a ship collision model with wind and sea current effects. Finally, a comparison of the results for the proposed collision model in this study and the ship maneuvering simulator is shown to illustrate the effectiveness of the proposed mathematical model in this paper, followed by the conclusions and suggestions given to navigators, port managers, and governmental maritime departments to improve navigational safety in port and coastal waters.

scholarly journals Information scrambling in a collision model

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
Yan Li ◽  
Xingli Li ◽  
Jiasen Jin
Keyword(s):  
Collision Model

An Aircraft Collision Model

1975 ◽  
Vol 21 (10) ◽  
pp. 1089-1101 ◽  
Author(s):  
Robert E. Machol
Keyword(s):  
Collision Model

Anisotropy in the Dicke Narrowing of Rotational Raman Lines (A New Measure of the Nonsphericity of Intermolecular Forces)

1972 ◽  
Vol 50 (8) ◽  
pp. 778-782 ◽  
Author(s):  
B. K. Gupta ◽  
S. Hess ◽  
A. D. May
Keyword(s):  
Diffusion Coefficient ◽  
Physical Interpretation ◽  
Anisotropic Diffusion ◽  
Scattered Light ◽  
Intermolecular Forces ◽  
Gaseous Hydrogen ◽  
Experimental Results ◽  
Scattering Angle ◽  
Collision Model

The diffusion coefficient characterizing the Dicke narrowing of the rotational Raman lines, in general, depends on the polarizations of the incident and scattered light and on the scattering angle. Experimental results for the anisotropic diffusion coefficient are presented for 90° scattering and vv and vh polarizations of the S0(1) line in gaseous hydrogen. The physical interpretation of the observed anisotropy is given with the help of a simple collision model.

Collision analysis and safety evaluation using a collision model for the frontal robot–human impact

Robotica ◽  
2014 ◽  
Vol 33 (7) ◽  
pp. 1536-1550 ◽  
Author(s):  
Jung-Jun Park ◽  
Jae-Bok Song ◽  
Sami Haddadin
Keyword(s):  
Impact Analysis ◽  
Safety Evaluation ◽  
Design Parameters ◽  
Body Parts ◽  
Robot Arm ◽  
Collision Model ◽  
Crash Testing ◽  
Mass Spring ◽  
Head Neck ◽  
Significant Attention

SUMMARYThe safety analysis of human–robot collisions has recently drawn significant attention, as robots are increasingly used in human environments. In order to understand the potential injury a robot could cause in case of an impact, such incidents should be evaluated before designing a robot arm based on biomechanical safety criteria. In recent literature, such incidents have been investigated mostly by experimental crash-testing. However, experimental methods are expensive, and the design parameters of the robot arm are difficult to change instantly. In order to solve this issue, we propose a novel robot-human collision model consisting of a 6-degree-of-freedom mass-spring-damper system for impact analysis. Since the proposed robot-human consists of a head, neck, chest, and torso, the relative motion among these body parts can be analyzed. In this study, collision analysis of impacts to the head, neck, and chest at various collision speeds are conducted using the proposed collision model. Then, the degree of injury is estimated by using various biomechanical severity indices. The reliability of the proposed collision model is verified by comparing the obtained simulation results with experimental results from literature. Furthermore, the basic requirements for the design of safer robots are determined.

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