scholarly journals Reanalysis of the Sydney Harbor RiverCat Ferry

2021 ◽  
Vol 9 (2) ◽  
pp. 215
Author(s):  
Lawrence J. Doctors
Keyword(s):  
Detailed Analysis ◽  
Good Accuracy ◽  
Wave Generation ◽  
Wave Resistance ◽  
Affine Transformations ◽  
Design And Development ◽  
Total Drag ◽  
Vessel Speed

In this paper, we revisit the hydrodynamics supporting the design and development of the RiverCat class of catamaran ferries operating in Sydney Harbor since 1991. More advanced software is used here. This software accounts for the hydrodynamics of the transom demisterns that experience partial or full ventilation, depending on the vessel speed. This ventilation gives rise to the hydrostatic drag, which adds to the total drag of the vessel. The presence of the transom also creates a hollow in the water. This hollow causes an effective hydrodynamic lengthening of the vessel, which leads to a reduction in the wave resistance. Hence, a detailed analysis is required in order to optimize the size of the transom. It is demonstrated that the drag of the vessel and the wave generation can be predicted with good accuracy. Finally, the software is also used to optimize the vessel further by means of affine transformations of the hull geometry.

The Wave System of the Sydney Harbor RiverCat Ferry

2021 ◽  
Author(s):  
Lawrence J. Doctors
Keyword(s):  
Wave Generation ◽  
Wave Resistance ◽  
Wave System ◽  
Design And Development

We revisit here the hydrodynamics supporting the design and development of the RiverCat class of catamaran ferries operating in Sydney Harbor since 1991. The design of the ferry was strongly influenced by the requirement to limit the erosion of the banks on the sides of the Parramatta River along which these ferries operate. More advanced software is used here. This software accounts for the hydrodynamics of the transom stern which create a hollow in the water. This hollow causes an effective hydrodynamic lengthening of the vessel. This leads to a reduction in the generation of the wave system and the consequent wave resistance. It is demonstrated that lengthening the RiverCat would substantially reduce its wave generation.

scholarly journals Getting the ducks in a row

2021 ◽  
Vol 932 ◽  
Author(s):  
Simen Å. Ellingsen
Keyword(s):  
Design Research ◽  
Unmanned Vehicles ◽  
Wave Resistance ◽  
Resistance Force ◽  
Total Drag ◽  
Wave Interference ◽  
Us Military ◽  
Individual Wave ◽  
Concomitant Resistance ◽  
Shaped Pattern

Vessels – in the widest sense – travelling on a water surface continuously do work the water surrounding it, causing energy to be radiated in the form of surface waves. The concomitant resistance force, the wave resistance, can account for as much as half the total drag on the vessel, so reducing it to a minimum has been a major part of ship design research for many decades. Whether the ‘vessel’ is an ocean-going ship or a swimming duckling, the physics governing the V-shaped pattern of radiated waves behind it is in essence the same, and just as fuel economy is important for commercial vessels, it is reasonable to assume that also swimming waterfowl seek to minimise their energy expenditure. Using theory and methods from classic marine hydrodynamics, Yuan et al. (J. Fluid Mech., vol. 928, 2021, R2) consider whether, by organising themselves optimally, ducklings in a row behind a mother duck can reduce, eliminate or even reverse their individual wave resistance. They describe two mechanisms which they term ‘wave riding’ and ‘wave passing.’ The former is intuitive: the ducklings closest to the mother can receive a forward push by riding its mother's stern waves. The latter is perhaps a more striking phenomenon: when the interduckling distance is precisely right, every duckling in the row can, in principle, swim without wave resistance due to destructive wave interference. The phenomenon appears to be the same as motivates the recent US military research project Sea Train, a row of unmanned vehicles travelling in row formation.

scholarly journals Adaptive short term COVID-19 prediction for India

2020 ◽  
Author(s):  
Shuvrangshu Jana ◽  
Debasish Ghose
Keyword(s):  
Detailed Analysis ◽  
Good Accuracy ◽  
Data Driven ◽  
Adaptive Model ◽  
Short Term ◽  
Term Prediction ◽  
Short Term Prediction

In this paper, a data-driven adaptive model for infection of COVID-19 is formulated to predict the confirmed total cases and active cases of an area over 4 weeks. The parameter of the model is always updated based on daily observations. It is found that the short term prediction of up to 3-4 weeks can be possible with good accuracy. Detailed analysis of predicted value and the actual value of confirmed total cases and active cases for India from 1st June to 3rd July is provided. Prediction over 7, 14, 21, 28 days has the accuracy about 0.73% ± 1.97%, 1.92% ± 2.95%, 4.34% ± 3.91%, 6.40% ± 9.26% of the actual value of confirmed total cases. Similarly, the 7, 14, 21, 28 days prediction has the accuracy about 1.24% ± 6.57%, 3.04% ± 10%, 6.33% ± 16.12%, 10.2% ± 24.14% of the actual value of confirmed active cases.

An apparatus for the study of fast precipitation reactions

1989 ◽  
Vol 53 (373) ◽  
pp. 527-530 ◽  
Author(s):  
David Rickard
Keyword(s):  
Steady State ◽  
Reaction Time ◽  
Detailed Analysis ◽  
High Precision ◽  
Good Accuracy ◽  
Iron Sulphide ◽  
Reaction Progress ◽  
T Tube ◽  
Sulphide Precipitation ◽  
Precipitation Reactions

AbstractAn apparatus is described for the measurement of the rates of fast precipitation reactions. It consists of a T-tube, where reactants are added to the arms of the T, mixed rapidly at the junction, and the rates of disappearance of reactants or appearance of products are measured along the stem of the T. The geometry of the system results in a steady state being established in the apparatus, enabling detailed analysis of reaction progress. The apparatus has been used to investigate the kinetics and mechanism of iron sulphide precipitation reactions. It has enabled measurements to be made with relatively high precision and good accuracy of the first 130 ms of reaction time.

Application of Integrated Electrical Mechanical Control System Technology for Civil Transportation Aircraft Design and Development

2013 ◽  
Vol 299 ◽  
pp. 83-88 ◽  
Author(s):  
Lei Zhang ◽  
Nan Shan ◽  
Miao Huan Zhang
Keyword(s):  
Control System ◽  
Detailed Analysis ◽  
Aircraft Design ◽  
System Technology ◽  
Design And Development ◽  
Mechanical Control ◽  
Development Risks

Integrated electrical mechanical control system (IEMS) technology applied on civil transportation aircraft is firstly introduced in the article. Besides, from the standpoint of airframer, detailed analysis of design and development risks is conducted and relevant mitigation suggestions are proposed accordingly. Finally, the importance and strategy for the construction of a simulation and test all-in-one bench by airframer are also discussed.

scholarly journals Multi-Objective Weather Routing of Sailboats Considering Wave Resistance

2018 ◽  
Vol 25 (1) ◽  
pp. 4-12 ◽  
Author(s):  
Marcin Życzkowski ◽  
Przemysław Krata ◽  
Rafał Szłapczyński
Keyword(s):  
Input Data ◽  
Wave Resistance ◽  
Wind Vector ◽  
Sea Waves ◽  
Resistance Increase ◽  
Deterministic Algorithms ◽  
Proposed Model ◽  
Basic Input ◽  
Vessel Speed ◽  
Speed Characteristic

Abstract The article presents a method to determine the route of a sailing vessel with the aid of deterministic algorithms. The method assumes that the area in which the route is to be determined is limited and the basic input data comprise the wind vector and the speed characteristic of the vessel. Compared to previous works of the authors, the present article additionally takes into account the effect of sea waves with the resultant resistance increase on the vessel speed. This approach brings the proposed model closer to real behaviour of a sailing vessel. The result returned by the method is the sailing route, optimised based on the multi-criteria objective function. Along with the time criterion, this function also takes into account comfort of voyage and the number of performed turns. The developed method has been implemented as simulation application SaillingAssistance and experimentally verified.

scholarly journals Design in ISO 9001:2015

2020 ◽  
Vol 2020 (148) ◽  
pp. 769-781
Author(s):  
Radosław WOLNIAK ◽  
Keyword(s):  
Quality Management ◽  
Product Development ◽  
Detailed Analysis ◽  
Development Planning ◽  
Iso 9001 ◽  
International Literature ◽  
Design Team ◽  
Literature Analysis ◽  
Design And Development ◽  
Polish Literature

Purpose:The aim of the paper is to analysethe problems connected with the design of 5operation processesrealised within an organisation in the ISO 9001:2015 implementation 6process.7Design/methodology/approach:Critical literature analysis. Analysis of international literature 8from main databases and Polish literature and legal acts connecting with the researched topic. 9Findings:Design and development planning refers to identifying the stages and controls for 10the stages to design and develop products. Stages that are appropriate for product development 11are decided by a design team. An organisation is required to plan and develop its design and 12development activities as a process. The goal of this process is to ensure that the realisation of 13the product or service will be according to their specification. The design and development 14processes, operations, activities and controls shall be planned in accordance to several 15requirements. The organisation should implement the planned arrangementsat appropriate 16stages to verify that the product and service requirements have been met. The release of 17products and services to the customer shall not proceed until the planned arrangements have 18been satisfactory completed, unless otherwise approved by a relevant authority and as 19applicable by the customer.20Originality/value: Detailed analysis of all subjects related totheorganisation of designin ISO 219001:2015.22Keywords: quality management, ISO 9001:2015, ISO 9001, operations, design.23Category of the paper:literature review.

A course on serious game design and development using an online problem-based learning approach

2015 ◽  
Vol 12 (2) ◽  
pp. 116-136 ◽  
Author(s):  
Bill Kapralos ◽  
Stephanie Fisher ◽  
Jessica Clarkson ◽  
Roland van Oostveen
Keyword(s):  
Instructional Design ◽  
Detailed Analysis ◽  
Game Design ◽  
Serious Games ◽  
Problem Based Learning ◽  
Serious Game ◽  
Game Based Learning ◽  
Design And Development ◽  
Content Type ◽  
Active Research

Purpose – The purpose of this paper is to describe a novel undergraduate course on serious game design and development that integrates both game and instructional design, thus providing an effective approach to teaching serious game design and development. Very little effort has been dedicated to the teaching of proper serious game design and development leading to many examples of serious games that provide little, if any, educational value. Design/methodology/approach – Organized around a collection of video clips (that provided a brief contextualized overview of the topic and questions for further exploration), readings, interdisciplinary research projects and games, the course introduced the principles of game and instructional design, educational theories used to support game-based learning and methods for evaluating serious games. Discussions and activities supported the problems that students worked on throughout the course to develop a critical stance and approach toward implementing game-based learning. Students designed serious games and examined potential issues and complexities involved in developing serious games and incorporating them within a teaching curriculum. Findings – Results of student course evaluations reveal that the course was fun and engaging. Students found the course fun and engaging, and through the successful completion of the final course project, all students met all of the course objectives. A discussion regarding the techniques and approaches used in the course that were successful (or unsuccessful) is provided. Research limitations/implications – It should be noted that a more detailed analysis has not been presented to fully demonstrate the effectiveness of the course. A more detailed analysis may have included a comparison with, for example, past versions of the course that was not based on an online problem-based learning (PBL) approach, to better quantify the effectiveness of the course. However, such a comparison could not be carried out here, given there was no measure of prior knowledge of students taken before they took course (e.g. no “pre-test data”). Originality/value – Unlike the few existing courses dedicated to serious game design, the course was designed specifically to facilitate a fully online PBL approach and provided students the opportunity to take control of their own learning through active research, exploration and problem-solving alone, in groups and through facilitated class discussions.

scholarly journals PRZESŁANIE ROZBITKA. WĄTKI ORFICKIE W POEZJI KRZYSZTOFA KARASKA

2016 ◽  
Vol 19 (2) ◽  
pp. 69
Author(s):  
Artur Nowaczewski
Keyword(s):  
Detailed Analysis ◽  
Wave Generation ◽  
New Wave ◽  
The World

Although Krzystof Karasek counts among the most outstanding representatives of the Nowa Fala (New Wave) generation, his poems have not been subject to detailed analysis so far. The author attempts to highlight the meaning of the Orphic threads in Krzysztof Karasek’s poetry written after 1989. For more than twenty years Karasek’s poems have been tied to each other by a suggestive figure of a hero named by the poet a ‘castaway’. This castaway’s characteristics include distance to himself and lack of delusion about the condition of the world after personal and cultural collapse. Still, it also includes great appraisal of life. The poet, defining the figure of the castaway, calls in a number of castaway figures, characters after catastrophe, among which one can find the mythical Orpheus. The article addresses the originality of Karasek’s idea with regard to his polemical texts which engaged with Zbigniew Herbert’s and Julian Kornhauser’s works.

Prosodic Impairment Associated With Traumatic Brain Injury

2009 ◽  
Vol 19 (3) ◽  
pp. 97-102
Author(s):  
Billy Irwin
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Detailed Analysis ◽  
Acoustic Characteristics ◽  
Individual Variations

Abstract Purpose: This article discusses impaired prosody production subsequent to traumatic brain injury (TBI). Prosody may affect naturalness and intelligibility of speech significantly, often for the long term, and TBI may result in a variety of impairments. Method: Intonation, rate, and stress production are discussed in terms of the perceptual, physiological, and acoustic characteristics associated with TBI. Results and Conclusions: All aspects of prosodic production are susceptible to the effects of damage resulting from TBI. There are commonly associated prosodic impairments; however, individual variations in specific aspects of prosody require detailed analysis.

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