High Technology in Shipbuilding

1987 ◽  
Vol 201 (2) ◽  
pp. 59-72 ◽  
Author(s):  
P A Milne
Keyword(s):  
Computer Program ◽  
High Technology ◽  
Industrial Robots ◽  
Shipbuilding Industry ◽  
Delivery Times ◽  
Cad Cam ◽  
Computer Based ◽  
Reduced Costs ◽  
Engine Construction

Following a review of market developments and their dramatic effects on shipbuilders, the paper makes a case for a continuing shipbuilding industry in Europe, and reviews the investment in high technology equipment in merchant shipyards. The introduction of computer-based systems in the industry and the extensive use of CAD/CAM in shipyards are described. The use and potential of industrial robots and lasers are covered. Advances in engine construction and ship production resulting in shorter delivery times and reduced costs are illustrated. Engine selection by computer program is described and the paper concludes with a view on future changes in merchant shipbuilding.

A discussion on ship technology in the 1980s - An integrated approach to design and production

1972 ◽  
Vol 273 (1231) ◽  
pp. 99-118
Keyword(s):  
Systems Approach ◽  
Integrated Approach ◽  
Numerical Control ◽  
Final Part ◽  
Preliminary Design ◽  
Paper Briefly ◽  
Shipbuilding Industry ◽  
Detail Design ◽  
Computer Based ◽  
Design And Production

The paper briefly surveys some of the computer based systems now available for the preliminary design of ships up to the final tendering stage; the paper then outlines techniques currently used for the computer production of control tapes for plate definition and cutting etc., by numerical control and/or the presentation of information through automatic draughting. Research now in progress which will extend from the preliminary design into the detail design of steelwork is described, and a system is discussed by which the first phase of real integration of design and production will be produced for use by the industry in the next few years. The final part of the paper suggests some of the longer term and comprehensive developments towards integration which could be undertaken during the latter part of the 1970s in order to meet what may be the design and production requirements for the 1980s. An attempt is also made to assess both the need and advantages of integration for the shipbuilding industry quite apart from the exciting challenge any solutions will present to those concerned with the furthering of an inter-disciplinary and systems approach to industrial advancement.

Reliability of the Multi-Dimensional Voice Program for the Analysis of Voice Samples of Subjects With Dysarthria

1999 ◽  
Vol 8 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Ray D. Kent ◽  
Houri K. Vorperian ◽  
Joseph R. Duffy
Keyword(s):  
Computer Program ◽  
Clinical Assessment ◽  
Quantitative Information ◽  
Speech Disorders ◽  
Clinical Applications ◽  
Automatic Analysis ◽  
Acoustic Parameters ◽  
Assessment And Treatment ◽  
Computer Based ◽  
Quantitative Assessments

Computer-based analysis systems are increasingly available for the clinical assessment of speech and voice functions. These systems have the potential to provide immediate quantitative information to assist clinical assessment and treatment. The Multi-Dimensional Voice Program (MDVP) is a computer program that can calculate as many as 33 acoustic parameters from a voice sample. The MDVP appears to have potential for rapid quantitative assessments of voice in both research and clinical applications. This report evaluates the robustness and reliability of MDVP for vocal analyses of 32 individuals with dysarthria of various etiologies. It is concluded that the reliability is generally very good and that MDVP has potential as a tool for the semi-automatic analysis of voice samples in dysarthria. Some parameters appear to hold particular value in the description of voice qualities in these speech disorders.

Robotic Solutions Applied to Production and Measurement of Marine Propellers

2012 ◽  
Author(s):  
Javier Cavada ◽  
Fernando Fadón
Keyword(s):  
Industrial Robots ◽  
Cell Alignment ◽  
Marine Propellers ◽  
Tool Positioning ◽  
Cad Cam ◽  
Principal Factors ◽  
Propeller Blades ◽  
The Individual ◽  
Accuracy And Repeatability ◽  
Individual Design

Over the past decades, robots have emerged as a valuable technological solution for multiple highly complex industrial processes, and the manufacture of marine propellers has not been an exception. Majority of the propellers being produced worldwide are custom-designed products aiming to satisfy each ship’s propulsion requirements. Such geometrical diversity is a considerable challenge when traditionally manual manufacturing processes like hand-grinding and polishing need to be automated. In several market-leading propeller manufacturers within Europe and Asia, industrial robots are being applied for widely diverse operations such as milling polystyrene blocks to make moulding patterns, grinding out the excess material in the blade surfaces, or polishing the complete propellers’ surface before their final verification. Propeller blades are customized products, formed by curved and warped surfaces, requiring minimum 5 axes to be smoothly polished, and this can be easily achieved with a robot cell where the CAD/CAM data coming from the individual design are directly translated into robotic parameters. While this solution has demonstrated to be perfectly capable to comply with the marine propellers finishing tolerances, which are internationally defined by ISO 484 standard rules [6], robotic solutions for propeller measurement have not been successfully implemented within this specific industry due to reasons like lack of accuracy and repeatability. This paper analyses the root causes behind this problem, identifying the calibration process, the cell alignment method and the tool positioning as the principal factors resulting in this low measuring repeatability. Findings explained by the authors are the outcome of several practical measuring tests made on real marine propellers within ABB and Fanuc robot cells. This paper concludes offering solutions to reduce the inaccuracies caused by the mentioned factors, and recommending what type of marine propellers are more suitable to be measured with industrial robots, on the basis of ISO 484 requirements for each customized design. Moreover, suggestions for further research on this specific measuring application are provided in the concluding chapter.

Computer Simulation of Human Ratings of the Paragraph Completion Method

1984 ◽  
Vol 54 (1) ◽  
pp. 129-130
Author(s):  
Gary M. Ingersoll
Keyword(s):  
Computer Simulation ◽  
Conceptual Level ◽  
Computer Based ◽  
Reduced Costs ◽  
Efficient Approximation

A computer-based algorithm for simulating human ratings of the Paragraph Completion Method, an open-ended response technique for assessing conceptual level, was assessed. The results indicate that a reasonably reliable, efficient approximation to human ratings may be achieved through the use of a computer. Advantages to computer-based simulation of ratings are reduced costs of training human raters and reduced fluctuations in reliability.

A Study on the CAD/CAM of Curvic Couplings

2002 ◽  
Author(s):  
Ying-Chien Tsai ◽  
Wei-Yi Hsu
Keyword(s):  
Computer Program ◽  
Mathematical Models ◽  
3D Models ◽  
Design Parameters ◽  
Quadric Surface ◽  
Turbine Engine ◽  
Contact Patterns ◽  
Cad Cam ◽  
Cone Surface ◽  
Input Variables

The curvic coupling was first developed by Gleason Works about sixty years ago. Then, it has been implemented through design and manufacture methods to be used for connecting shafts of gas-turbine engine. The stiffness and the accuracy of centering the coupling have become very important. Therefore, it is necessary to design curvic couplings with the following characteristics: high positioning accuracy, high indexing accuracy, high indexing stiffness, self-centering, and self-improving of indexing accuracy. The process of designing and manufacturing curvic coupling required prior experience as well as a series of trial and error runs. In this paper, mathematical models for designing curvic coupling are developed. First, the parametric and the generalized forms of the quadric surface are presented, and then the mathematical models of cone surface are obtained from the degeneration of quadric surface. Tooth profiles are described by using mathematical model of cone surface in conjunction with design/manufacturing parameters of curvic coupling. The contact patterns are predicted by solving the intersections of all meshing surfaces on the pair of curvic couplings simultaneously. Finally, a computer program is developed for designing curvic couplings with design parameters as input variables to predict the contact patterns of designed curvic couplings and to show them in the form of 3D models. Some design charts are also presented. It is believed that the methodology and the computer program developed in this paper will prove to be an efficient tool for the design and manufacturing of curvic couplings.

scholarly journals Development and Evaluation of a Computer-Based, Self-Management Tool for People Recently Diagnosed with Type 2 Diabetes

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Alison O. Booth ◽  
Carole Lowis ◽  
Steven J. Hunter ◽  
Moira Dean ◽  
Chris R. Cardwell ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Computer Program ◽  
User Satisfaction ◽  
Controlled Trial ◽  
Intervention Group ◽  
Management Tool ◽  
Self Management ◽  
Control Group ◽  
Computer Based

Aim. The purpose of this study was to develop and evaluate a computer-based, dietary, and physical activity self-management program for people recently diagnosed with type 2 diabetes.Methods. The computer-based program was developed in conjunction with the target group and evaluated in a 12-week randomised controlled trial (RCT). Participants were randomised to the intervention (computer-program) or control group (usual care). Primary outcomes were diabetes knowledge and goal setting (ADKnowl questionnaire, Diabetes Obstacles Questionnaire (DOQ)) measured at baseline and week 12. User feedback on the program was obtained via a questionnaire and focus groups.Results. Seventy participants completed the 12-week RCT (32 intervention, 38 control, mean age 59 (SD) years). After completion there was a significant between-group difference in the “knowledge and beliefs scale” of the DOQ. Two-thirds of the intervention group rated the program as either good or very good, 92% would recommend the program to others, and 96% agreed that the information within the program was clear and easy to understand.Conclusions. The computer-program resulted in a small but statistically significant improvement in diet-related knowledge and user satisfaction was high. With some further development, this computer-based educational tool may be a useful adjunct to diabetes self-management. This trial is registered with clinicaltrials.gov NCT numberNCT00877851.

Fabrication of Maxillofacial Implant Using CAD CAM System

2010 ◽  
Vol 146-147 ◽  
pp. 353-356
Author(s):  
Se Kou Singare ◽  
Li Wang ◽  
Shou Yan Zhong ◽  
Guang Hui Xu ◽  
Wei Ping Wang ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
3D Model ◽  
Maxillofacial Surgery ◽  
Bone Defects ◽  
Bony Defect ◽  
Cad Cam ◽  
Computer Based ◽  
3D Acquisition ◽  
Aided Design ◽  
Individual Implant

We present an approach that combines Computer Tomography (CT), reverse engineering (RE) and rapid prototyping (RP) for individual implant production in maxillofacial surgery. 3D acquisition of the patient’s skull is performed, after acquisition of data; an individual computer-based 3D model of the bony defect is generated. These data are transferred into RE software to create the implant using a computer-aided design (CAD) model, which is directed into the RP machine for the production of the physical model. The implant is then directly used in investment casting such as “Quick Cast” pattern to produce the titanium model. In the clinical reports presented here, reconstructions of one patient with mandible bone defects were performed using this method. The custom prostheses perfectly fit the defects during the operations, and surgery time was reduced.

Robotic CAM System Available for Both CL Data and NC Data

2013 ◽  
pp. 265-276 ◽  
Author(s):  
Fusaomi Nagata ◽  
Sho Yoshitake ◽  
Keigo Watanabe ◽  
Maki K. Habib
Keyword(s):  
Industrial Robot ◽  
Industrial Robots ◽  
Numerical Control ◽  
Open Architecture ◽  
Experimental Result ◽  
Location Data ◽  
Cad Cam ◽  
Nc Machine ◽  
Servo Controller ◽  
Nc Data

This chapter describes the development of a robotic CAM system for an articulated industrial robot from the viewpoint of robotic servo controller. It is defined here that the CAM system includes an important function that allows an industrial robot to move along not only numerical control data (NC data) but also cutter location data (CL data) consisting of position and orientation components. A reverse post-processor is proposed for the robotic CAM system to online generate CL data from the NC data generated for a five-axis NC machine tool with a tilting head, and the transformation accuracy about orientation components in CL data is briefly evaluated. The developed CAM system has a high applicability to other industrial robots with an open architecture controller whose servo system is technically opened to end-users, and also works as a straightforward interface between a general CAD/CAM system and an industrial robot. The basic design of the robotic CAM system and the experimental result are presented, in which an industrial robot can move based on not only CL data but also NC data without any teaching.

The 1983 CAD/CAM Survey: Why It’s Still Relevant, What It Said

1987 ◽  
Vol 3 (02) ◽  
pp. 87-94
Author(s):  
Richard L. Diesslin
Keyword(s):  
Cross Section ◽  
Building Industry ◽  
User Experiences ◽  
Shipbuilding Industry ◽  
Ship Building ◽  
Computer Technologies ◽  
Cad Cam ◽  
Industry Survey ◽  
The U.S

The response to the CAD/CAM shipbuilding industry survey of 1983 was quite comprehensive. The survey included an invaluable cross section of shipyards and design agencies of all sizes, levels of sophistication, and type of production. It remains the most significant study of its kind in recent years. Eighteen shipyards and four design agencies participated. In addition, nine visits were made, eight to shipyards and one to a design agency. This paper summarizes the findings of the CAD/CAM survey, which studied the application of computer technologies (CT's) to manufacturing in the U.S. ship building industry. Six major CT areas are evaluated across 79 specific shipyard functions; then the software in use is evaluated based on user experiences. Finally, computer technologies are evaluated based on their qualitative benefits and problems. Highlights from the shipyard visits are outlined, voids in the shipbuilding industry's application of CT are presented, and recommendations and conclusions are cited based on survey findings.

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