VERTICAL AND SLOPED BANK EFFECTS ON DIFFERENT SHIP TYPES

2021 ◽  
Vol 157 (A3) ◽  
Author(s):  
Dong-Taur Su
Keyword(s):  
Current Flow ◽  
Center Of Mass ◽  
Computer Design ◽  
Hydrodynamic Analysis ◽  
Safe Navigation ◽  
Study Results ◽  
Bank Effects ◽  
Design Software ◽  
Asymmetric Flows ◽  
Yaw Moment

This study employed computer design software to completely draft 3D ship models; then, computational fluid dynamics were used to establish numeric navigation channels and simulate fluid hydrodynamic analysis of ships navigating along shore banks. The parameters considered comprised bank type (vertical and sloped), ship model (two types), velocity, ship-to-bank distance, and navigation time. Figures and tables were used to present the distribution of ship stern eddy current, flow field pressure, and velocity, and the comparison of center of mass deviation, sway force, and yaw moment. Results showed that ships navigating along embankments and channels produced asymmetric flows, which draw the bow away from the shore. Larger ships are substantially more influenced by bank effects than smaller ships. Large sway forces and yaw moments are produced in large ships, drifting the bow away from the bank and the stern towards the bank, increasing the risk of collision with the embankment. From the study results, the characteristics of bank effects are understood and can be used for assisting the safe navigation of ships in restricted waters.

Vertical and Sloped Bank Effects on Different Ship Types

2015 ◽  
Vol 157 (A3) ◽  
pp. 189-204
Keyword(s):  
Current Flow ◽  
Center Of Mass ◽  
Computer Design ◽  
Hydrodynamic Analysis ◽  
Safe Navigation ◽  
Study Results ◽  
Bank Effects ◽  
Design Software ◽  
Asymmetric Flows ◽  
Yaw Moment

"This study employed computer design software to completely draft 3D ship models; then, computational fluid dynamics were used to establish numeric navigation channels and simulate fluid hydrodynamic analysis of ships navigating along shore banks. The parameters considered comprised bank type (vertical and sloped), ship model (two types), velocity, ship-to-bank distance, and navigation time. Figures and tables were used to present the distribution of ship stern eddy current, flow field pressure, and velocity, and the comparison of center of mass deviation, sway force, and yaw moment. Results showed that ships navigating along embankments and channels produced asymmetric flows, which draw the bow away from the shore. Larger ships are substantially more influenced by bank effects than smaller ships. Large sway forces and yaw moments are produced in large ships, drifting the bow away from the bank and the stern towards the bank, increasing the risk of collision with the embankment. From the study results, the characteristics of bank effects are understood and can be used for assisting the safe navigation of ships in restricted waters."

scholarly journals Factors to be Considered When to Design Software Development Plan

2012 ◽  
Vol 6-7 ◽  
pp. 3-8
Author(s):  
Yu Gao ◽  
Xiang Zhong Feng
Keyword(s):  
Software Development ◽  
Development Plan ◽  
Team Development ◽  
Difficulty Level ◽  
Design Work ◽  
Study Results ◽  
Design Software ◽  
Development Risks ◽  
Development Methods ◽  
Main Factor

It is an important prerequisite to ensure the success of software development that designing a reasonable and suitable software development plan. In the past, when discussing the design of the software development plan, people focus limited to a specific development tasks, so the lack of universality. In order to guide design work of software development plan, starting from the perspective of software engineering, the main factor to be considered has been studied when designing software development plan. These factors are: the type and size of the software, the experience of use for reference to predecessors, difficulty level to obtain users' needs, development techniques and tools, situation of development team, development risks, the software development methods that can be chosen. This study results can improve the rationality and applicability of the software development plan.

Correction of motor coordination abilities in acute cerebral circulation defect with the use of physical rehabilitation

2020 ◽  
pp. 91-97
Author(s):  
Andrey P. Popov ◽  
Valentina I. Syutina
Keyword(s):  
Muscle Strength ◽  
Cerebral Circulation ◽  
Motor Coordination ◽  
Center Of Mass ◽  
Recovery Period ◽  
Standing Position ◽  
Physical Rehabilitation ◽  
Early Recovery ◽  
Leading Role ◽  
Study Results

Due to the high frequency of strokes in the Russian Federation, leading to disability, loss of efficiency and loss of household autonomy, the development of methods of patients rehabilitation who have suffered acute cerebral circulation disorder is of high importance. The consequences of this condition is characterized by a number of syndromes, among which the leading role in reducing the motor activity of patients and limiting their ability to self-service, is hemiparesis, accompanied by a decrease in voluntary muscle strength in the affected limbs. We present the study results of computer stabilometry indicators as a means of assessing the ability to maintain static equilibrium in a standing position and control the oscillations of the general center of mass. We also present the evaluation results of arbitrary muscle strength of the affected limbs in patients with the consequences of acute cerebral circulation defect in the early recovery period. These studies were carried out as part of an experiment to assess the effectiveness of the multisensory stimulation technique, which is based on the combination of a number of stimulating and corrective effects in combination with physical exercises in closed and open kinematic circuits. The results of the study confirm the effectiveness of the developed method of physical rehabilitation.

scholarly journals Biomechanical effects of the addition of a precision constraint on a collective load carriage task

2021 ◽  
Author(s):  
Nour Sghaier ◽  
Guillaume Fumery ◽  
Vincent Fourcassie ◽  
Nicolas Alain Turpin ◽  
Pierre Moretto
Keyword(s):  
Recovery Rate ◽  
Center Of Mass ◽  
Motor Task ◽  
Target Position ◽  
Load Carriage ◽  
Upper Limbs ◽  
Cognitive Components ◽  
Study Results ◽  
Accuracy Constraint ◽  
The Moment

Team lifting is a complex and collective motor task that possesses both motor and cognitive components. The purpose of this study was to investigate to what extent the biomechanics of a collective load carriage is affected when a dyad of individuals is performing a carrying task with an additional accuracy constraint. Ten dyads performed a first condition in which they collectively transported a load (CC), and a second one in which they transported the same load while maintaining a ball in a target position on its top (PC). The recovery rate, amplitude, and period of the center-of-mass (COM) trajectory were computed for the whole system (dyad + table = PACS). We analyzed the forces and moments exerted at each joint of the upper limbs of the subjects. We observed a decrease in the overall performance of the dyads when the Precision task was added, i.e., i) the velocity and amplitude of CoMPACS decreased by 1,7% and 5,8%, respectively, ii) inter-subject variability of the Moment-Cost-Function decreased by 95% and recovery rate decreased by 19,2% during PC. A kinetic synergy analysis showed that the subjects reorganized their coordination in the PC. Our results demonstrate that adding a precision task affects the economy of collective load carriage. Notwithstanding, the joint moments at the upper-limbs are better balanced and co-vary more across the paired subjects during the precision task. Our study results may find applications in domains such as Ergonomics, Robotics-developments, and Rehabilitation.

Central Vehicle Computer Design: Software Taking Over

2019 ◽  
Vol 8 (6) ◽  
pp. 84-90
Author(s):  
Milan Z. Bjelica ◽  
Zeljko Lukac
Keyword(s):  
Computer Design ◽  
Design Software

Research on Influence of Moment Augment Factor of Column on Building Cost

2014 ◽  
Vol 487 ◽  
pp. 230-233
Author(s):  
Bin Cai ◽  
Xin Hui Liu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Concrete Structure ◽  
Reinforced Concrete Structure ◽  
Computer Design ◽  
Building Cost ◽  
Weak Beam ◽  
Design Software ◽  
The Cost

The new moment augment factor of column of the national Code for Seismic Design of Buildings (GB500112010) were increased, the strong column weak beam reliability of reinforced concrete structure were improved, at the same time, the cost of building were improved also. Influence of moment augment factor column on building cost was discussed by computer design software Guang Sha CAD. Result indicates that the increase of cost is very small.

scholarly journals The Influence of the Ship's Speed and Distance to an Arbitrarily Shaped Bank on Bank Effects

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Evert Lataire ◽  
Marc Vantorre ◽  
Guillaume Delefortrie
Keyword(s):  
Return Flow ◽  
Asymmetric Flow ◽  
Dimensionless Velocity ◽  
Test Conditions ◽  
Close Proximity ◽  
Unique Model ◽  
Bank Effects ◽  
Yaw Moment ◽  
Sailing Ship ◽  
Restricted Waterways

In shallow and restricted waterways, the water displaced by a sailing ship is squeezed under and along its hull. These confinements result in increased velocities of the return flow along the hull and the induced pressure distribution on the hull causes a combination of forces and moments on the vessel. If generated because of asymmetric flow due to the presence of a bank, this combination of forces and moment is known as bank effects. A comprehensive experimental research program on bank effects has been carried out in the towing tank for maneuvers in shallow water (cooperation Flanders Hydraulics Research—Ghent University) at Flanders Hydraulics Research (FHR) in Antwerp, Belgium. The obtained data consist of more than 14,000 unique model test conditions. The relative position and distance between a ship and an arbitrarily shaped bank is ambiguous. Therefore, a definition for a dimensionless distance to the bank is introduced. In this way, the properties of a random cross section are taken into account without exaggerating the bathymetry at a distance far away from the ship or without underestimating the bank shape at close proximity to the ship. Also, a dimensionless velocity is introduced to take the influence of the water depth, forward speed, and blockage into account. The proposed mathematical model for bank effects, often described as a sway force and yaw moment, is instead decomposed in two sway forces at each perpendicular.

Professional Software Analysis and Comparison for Graphic Design

2014 ◽  
Vol 644-650 ◽  
pp. 3170-3173
Author(s):  
Ruo Hong Wang
Keyword(s):  
Computer Technology ◽  
Graphic Design ◽  
Computer Graphic ◽  
Rapid Development ◽  
Modern Society ◽  
Computer Design ◽  
Software Analysis ◽  
The World ◽  
Future Society ◽  
Design Software

Contacting with the development of the society, the world is increasingly close, the Internet has become an inseparable part of modern society, and the new century must rely on the powerful computer information technology to better development. The continuous renewal of network, the rapid development of computer technology, computer graphic design industries widely used. Application in the field of generalized naturally shows the importance of computer graphic design, further shows the importance of studying graphic design knowledge. Present and future society requires high-quality high-cultural level of computer graphic design talent, so graphic designers must be skilled to master the operation and application of computer design software and technical skills.

Sign in / Sign up

Export Citation Format

Share Document