scholarly journals CATAMARAN MOTION SIMULATION BASED ON MOVING GRID TECHNIQUE

2009 ◽  
Vol 17 (2) ◽  
Author(s):  
Ebrahim Jahanbakhsh ◽  
Roozbeh Panahi ◽  
Mohammad Saeed Seif
Author(s):  
Yueh-Jaw Lin ◽  
Aaron Tegland

Abstract In recent years, walking robot research has become an important robotic research topic because walking robots possess mobility, as oppose to stationary robots. However, current walking robot research has only concentrated on even numbered legged robots. Walking robots with odd numbered legs are still lack of attention. This paper presents the study on an odd numbered legged (three-legged) walking robot — Tribot. The feasibility of three-legged walking is first investigated using computer simulation based on a scaled down tribot model. The computer display of motion simulation shows that a walking robot with three legs is feasible with a periodic gait. During the course of the feasibility study, the general design of the three-legged robot is also analyzed for various weights, weight distributions, and link lengths. In addition, the optimized design parameters and limitations are found for certain knee arrangements. These design considerations and feasibility study using computer display can serve as a general guideline for designing odd numbered legged robots.


2019 ◽  
Author(s):  
Dakui Feng ◽  
Xiao Cai ◽  
Yue Sun ◽  
Zhiguo Zhang ◽  
XiaoWei Huang

Abstract The maneuvering motion simulation of ship in waves needs large space, the simulation based static domain requires a large amount of mesh. On the contrary, the moving domain can reduce the grid amount and improve the simulation speed. This paper studies the establishment of numerical wave tank based moving domain. The wave-generation method of defining inlet boundary conditions is proposed. The level set method is used to solve the free surface. The URANS equation is solved by finite difference method and the projection algorithm. For the wave-generation method of defining inlet boundary conditions, the velocity inlet direction is always fixed because the direction of incident wave is always fixed. Specifically, the yaw should be turned off avoid the disturbance of wave in the y direction. Comparing the simulated wave with the target wave, the numerical results show that the simulated value is coincident with the theoretical value in the moving domain, and there are no obvious signs of dissipation over time. The established moving domain can produce a continuous and qualified wave, which provides a theoretical basis for the study of maneuvering simulation of ship in waves.


2020 ◽  
Vol 77 ◽  
pp. 1936-1953 ◽  
Author(s):  
Mohammad Ghalambaz ◽  
Seyed Mohsen Hashem Zadeh ◽  
S.A.M. Mehryan ◽  
Ioan Pop ◽  
Dongsheng Wen

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