Influence of Design Parameters on Vertical Motions of Trawler Hull Forms in Head Seas

1997 ◽  
Vol 34 (03) ◽  
pp. 181-196
Author(s):  
Abdi Kukner ◽  
Muhsin Aydm
Keyword(s):  
Computer Program ◽  
Froude Number ◽  
Regression Models ◽  
Ship Motion ◽  
Design Parameters ◽  
Radius Of Gyration ◽  
Early Design ◽  
Early Design Stages ◽  
Hull Forms

The influence of ship length, length to beam ratio, beam to draft ratio, prismatic coefficient, non-dimensional radius of gyration and Froude number upon significant amplitude of coupled heaving and pitching motions of trawler hull forms for six different sea states has been studied. For this purpose, 540 trawler hull forms have been generated from Doust trawler series to cover appropriate ranges of the design parameters. Seakeeping behavior of these forms has been studied by using an established ship motion computer program and regression models of significant seakeeping events have been derived. Through this study, it is believed that a method has been produced for the seakeeping evaluation of trawler forms during the early design stages, hence allowing for the design of safer and more seakindly trawler designs.

Spatial Incompatibility: Part Interaction and Tolerance Allocation in Configuration Design

1998 ◽  
Author(s):  
Rikard Söderberg ◽  
Hans L. Johannesson
Keyword(s):  
Cost Effective ◽  
Tolerance Allocation ◽  
Design Parameters ◽  
Functional Requirements ◽  
Early Design ◽  
Spatial Coupling ◽  
Assembly Design ◽  
Geometrical Features ◽  
Cad Models ◽  
Early Design Stages

Abstract This paper describes how function-means modeling techniques and spatial coupling analysis can be used in early design stages to increase robustness and knowledge about geometrical sensitivity of an assembly design. By incorporating spatial constraint decomposition in function-means modeling, overall spatial constraints may be broken down into nominal dimensions and tolerances for geometrical features. The analysis is carried out at the very early design stages, before CAD models are created and when only simple sketches exist. By documenting all information about functional requirements, design parameters and constraints in a hierarchically decomposed function-means structure, spatial couplings and overall sensitivities may be detected and alternative, less sensitive, concept solutions may be developed. Analyses of functional and constraint couplings increases the knowledge of and understanding for the geometrical sensitivity of a complex assembly design. This knowledge and understanding then serves as a base for tolerance allocation, where tolerances are to be allocated in the most functional and cost effective way.

Systems Thinking in Aerospace: The Contributions to the Design of Future Airliners’ Single Pilot Operations

2020 ◽  
Vol 64 (1) ◽  
pp. 188-192
Author(s):  
Daniela Schmid ◽  
Neville A. Stanton
Keyword(s):  
Literature Review ◽  
Human Factors ◽  
Systems Thinking ◽  
Systematic Literature Review ◽  
Hierarchical Structures ◽  
Theoretical Models ◽  
Sociotechnical Systems ◽  
System Behavior ◽  
Early Design ◽  
Early Design Stages

Systems thinking methods have evolved into a popular toolkit in Human Factors to analyze complex sociotechnical systems at early design stages, such as future airliners’ single pilot operations (SPO). A quantitative re-analysis of studies from a systematic literature review (Schmid & Stanton, 2019b) was conducted to categorically assess their contributions to researching SPO and to fitting their systems thinking methods to contemporary Human Factors problems. Although only 15 of 79 publications applied systems thinking methods to operational, automation, and the pilot incapacitation issue(s) of SPO, these studies provided a comprehensive concept of operations that is able to deal with many issues of future single-piloted airliners. These theoretical models require further evaluation by looking at the empirical instances of system behavior. Finally, the hierarchical structures in system’s development and operations from systems thinking enable Human Factors professionals and researchers to approach SPO systematically.

Design and Operational Experience of the SWATH Ship Navatek I

1993 ◽  
Vol 30 (03) ◽  
pp. 153-171
Author(s):  
Ludwig H. Seidl ◽  
William F. Clifford ◽  
James P. Cummings
Keyword(s):  
Structural Analysis ◽  
Parametric Study ◽  
Historical Development ◽  
Ship Motion ◽  
Actual Data ◽  
Operational Experience ◽  
General Design ◽  
Design Considerations ◽  
Constant Displacement ◽  
Hull Forms

A presentation is attempted linking the historical development, general design considerations for Small Waterplane Area, Twin-Hull (SWATH) hull shapes, the design of a particular SWATH, the Navatek/, and her operational experience. The "carrier vessel" concept on which the Navatek I is based is introduced. Principal dimensions and general arrangements are shown. A parametric study of twin-strut SWATH hull forms for a hull of constant displacement is presented in some detail. Stability and ship motion are discussed and actual data for the Navatek I presented. The overall structural analysis is briefly presented, including the method of analysis for the Navatek I. The SWATH captain's operational experience with the Navatek I during her extensive journeys is related to quite some extent.

Design optimization approach comparing multicriterial variants using BIM in early design stages

2021 ◽  
Author(s):  
Kasimir Forth ◽  
Jimmy Abualdenien ◽  
André Borrmann ◽  
Sabrina Fellermann ◽  
Christian Schunicht
Keyword(s):  
Design Optimization ◽  
Optimization Approach ◽  
Early Design ◽  
Early Design Stages

Parametric real-time energy analysis in early design stages: a method for residential buildings in Germany

2017 ◽  
Vol 3 (1) ◽  
pp. 13-23 ◽  
Author(s):  
Alexander Hollberg ◽  
Thomas Lichtenheld ◽  
Norman Klüber ◽  
Jürgen Ruth
Keyword(s):  
Real Time ◽  
Energy Analysis ◽  
Residential Buildings ◽  
Early Design ◽  
Early Design Stages

Identification of Human Errors During Early Design Stage Functional Failure Analysis

2018 ◽  
Author(s):  
Lukman Irshad ◽  
Salman Ahmed ◽  
Onan Demirel ◽  
Irem Y. Tumer
Keyword(s):  
Failure Analysis ◽  
Human Error ◽  
System Level ◽  
Design Stage ◽  
Human Factors Engineering ◽  
Human Errors ◽  
Functional Failure ◽  
Early Design ◽  
Early Design Stage ◽  
Early Design Stages

Detection of potential failures and human error and their propagation over time at an early design stage will help prevent system failures and adverse accidents. Hence, there is a need for a failure analysis technique that will assess potential functional/component failures, human errors, and how they propagate to affect the system overall. Prior work has introduced FFIP (Functional Failure Identification and Propagation), which considers both human error and mechanical failures and their propagation at a system level at early design stages. However, it fails to consider the specific human actions (expected or unexpected) that contributed towards the human error. In this paper, we propose a method to expand FFIP to include human action/error propagation during failure analysis so a designer can address the human errors using human factors engineering principals at early design stages. To explore the capabilities of the proposed method, it is applied to a hold-up tank example and the results are coupled with Digital Human Modeling to demonstrate how designers can use these tools to make better design decisions before any design commitments are made.

Geometrical Characteristics of Fishing Boats Series of ITU

2007 ◽  
Vol 44 (02) ◽  
pp. 125-137
Author(s):  
Muhsin Aydin ◽  
Aydin Salci
Keyword(s):  
Computer Program ◽  
The Body ◽  
Hull Form ◽  
The Third ◽  
Geometrical Characteristics ◽  
Fishing Boat ◽  
Technical University ◽  
Hull Forms

In the present paper, first 13 hull forms of fishing boats with different block coefficients were generated. Later, 26 hull forms of fishing boats with two different ratios of length to beam were generated by utilizing previous hull forms of fishing boats mentioned. In total, 39 fishing boats were generated. This series is called "Fishing Boats Series of ITU" (Istanbul Technical University). In this Series, the forms of the body stations and beams of the boats are the same for equal block coefficient and different lengths. The ratio of the beam of any station at any waterline to the beam of boat, Bz/B varies with respect to block coefficient, CB. These variations have been represented with the third-degree polynomials. Thus, a hull form of the fishing boat in the desired length and block coefficient can be obtained by using these polynomials. For this purpose, a computer program called "Turetme" was developed. Finally, by using this program, three hull forms of fishing boats were obtained and presented here.

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