scholarly journals Investigating the Deviation Angle Method for Ensuring Deflection at One-Lane Rural Roundabouts

2018 ◽  
Vol 13 (2) ◽  
pp. 127-138 ◽  
Author(s):  
Nicola Berloco ◽  
Pasquale Colonna ◽  
Paolo Intini ◽  
Vittorio Ranieri
Keyword(s):  
Computer Aided Design ◽  
Deflection Angle ◽  
The United States ◽  
Traffic Flows ◽  
Entry And Exit ◽  
Deviation Angle ◽  
Iterative Design ◽  
Angle Method ◽  
Aided Design ◽  
Design Guidance

Roundabouts developed as a road intersection design option has resulted in a series of nonuniform design guidance criteria in Europe, as well as in the United States and other Countries. In addition to different design specifications about the geometry of the elements constituting a roundabout (width and lanes of the circulatory roadway, entry and exit legs, splitter island), the methods for guaranteeing that vehicle paths deflect through the roundabout are also different. These methods ensure proper travel speeds between conflicting traffic flows. Currently, the main parameters used by standards to control the deflection are the deflection radius, the entry path radius, and the deviation angle. After a comparison between International deflection methods for roundabouts, this study checks the geometric requirements of the deviation angle for more than 7.000 hypothetical one-lane rural roundabouts. The Computer-Aided Design (CAD) drawing of the roundabouts takes into account the range of variability of their main geometric parameters, according to the Italian Standard. Subsequently, a number of the considered roundabouts checked with both the entry path radius and the German methods. Some results showing the greater effectiveness of the less popular deviation angle method are discussed. The main aims of this paper are:1) to promote the deviation angle method, which is only used in Switzerland and Italy;2) to improve standards, as regards the applicability and validity of the deflection angle method;3) to help practitioners to know in advance the outcome of the deflection checks at the beginning of the iterative design process, once the boundary conditions are known.

scholarly journals Generative Design of Articulated Rod of Radial Engine

2021 ◽  
Vol 6 (1) ◽  
pp. 36-47
Author(s):  
Sawan Kumar Rai ◽  
Harit Keawmuang ◽  
Himanshu Variyavwala ◽  
Laith Shatnawi
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Generative Design ◽  
Element Analysis ◽  
Iterative Design ◽  
Rotary Engine ◽  
Before And After ◽  
Working Performance ◽  
Fixed Input ◽  
Aided Design

The constant need for improvement drives humans to look for the best possible option in every field. Computer Aided Design (CAD) is no exception, to follow the best method of designing a product and finalizing it, researchers came up with an idea to generate multiple designs using fixed input values and finalizing the most appropriate one. The objective is achieved using an iterative design process based on algorithms by a specific software. Generative design introduces a new experience based on the Integration of machine dynamics in the manufacturing of objects and about experience. In this work generative design method was investigated on an articulated rod, one of the most important components of the rotary engine, to effectively improve the overall working performance of the engine and enhance its performance by decreasing its mass. Since fuel consumption by the machine can be greatly reduced by lowering the mass, so the goal is to minimize the weight of the rod while mechanical characteristics have to be within the acceptable values. Also, finite element analysis (FEA) was investigated on the part as to ensure the reliability of the rod before and after optimization.

scholarly journals Analysis of Engineering Accreditation Process and Outcomes: Lessons Learned for Successful First Time Application

2020 ◽  
Vol 19 (9) ◽  
pp. 281-300
Author(s):  
Tahar Ayadat ◽  
Andi Asiz
Keyword(s):  
Computer Aided Design ◽  
The United States ◽  
Accreditation Process ◽  
Lessons Learned ◽  
Engineering Programs ◽  
Engineering Program ◽  
Senior Design ◽  
Program Compliance ◽  
Aided Design ◽  
First Time

The aims of the paper are to share and analyze engineering accreditation experience starting from the preparation through the outcome, and to discuss lessons learned particularly for first-time applicants. Securing accreditation from a well-recognized international body, such as the Accreditation Board for Engineering and Technology (ABET) can indicate quality of an engineering program. To qualify for an accreditation up to six- to seven-year period, an engineering program must meet a set of accreditation standards or criteria. The article is not limited only for new engineering programs outside the United States who are willing to pursue engineering accreditation from ABET, but it is applicable for an existing accredited program who will undergo next accreditation cycle. The authors presented and analyzed detail accreditation experience for a new established Civil Engineering (CE) Program at Prince Mohammad bin Fahd University (PMU) in Saudi Arabia. Although the ABET website provides detail procedure for the accreditation steps, the detail cases experienced by the PMU CE program will enrich knowledge on how to prepare and handle successful international accreditation. The authors also discussed issues raised during the accreditation activities, including program compliance with the nine ABET criteria, and presented key lessons to prepare for a smooth accreditation process. The main significant result of the accreditation exercise about continuous improvement was summarized in term of the curriculum upgrade, including adding another semester for senior design course and offering new sustainability engineering course, and adding computer aided design course at the early semester.

scholarly journals Modelado y Recreación Virtual de Patrimonio Aeronáutico como Innovación Docente en Estudios de Ingeniería = Modelling and Virtual Recreation of Aeronautical Heritage as a Teaching Innovation in Engineering Studies

2021 ◽  
Vol 5 (2) ◽  
pp. 55
Author(s):  
Laura García-Ruesgas ◽  
Eduardo Fernández-González ◽  
Francisco Valderrama-Gual ◽  
Amparo Verdú-Vázquez
Keyword(s):  
Computer Aided Design ◽  
The United States ◽  
Teaching Innovation ◽  
Industrial Heritage ◽  
Professional Activities ◽  
Engineering Studies ◽  
Aeronautical Industry ◽  
Historical Heritage ◽  
Aided Design ◽  
Standard Software

El patrimonio aeronáutico a diferencia de otros como el arquitectónico o industrial no ha sido tan abordado históricamente.Desde hace 20 años, en la Escuela Técnica Superior de Ingeniería de Sevilla, se imparte docencia sobre Diseño y Fabricación Asistidos por Ordenador en sus múltiples titulaciones [2]. En los estudios de Ingeniería Aeroespacial se emplea CATIA, software estándar en la industria aeronáutica europea, Estados Unidos y Canadá [3].Durante el aprendizaje, los alumnos adquieren competencias para realizar modelados y recreaciones virtuales [5], no tan sólo orientadas a sus futuras actividades profesionales, sino también a otras relativas al rescate y catalogación del patrimonio histórico aeronáutico [6].Se presenta en esta comunicación el Modelado y Recreación Virtual del avión biplano Ansaldo SVA 5 [7], cuya documentación de partida consistió en planos realizados a mano y en documentos referentes a los diferentes procesos de verificación del proyecto del avión y a las modificaciones realizadasAbstractThe aeronautical heritage, unlike others such as architectural or industrial heritage, has not been so much addressed historically.For the last 20 years, the Seville School of Engineering has been teaching Computer Aided Design and Manufacturing in its multiple degrees [2]. CATIA, standard software in the aeronautical industry in Europe, the United States and Canada, is used in the Aerospace Engineering studies [3].During the apprenticeship, students acquire skills to perform modelling and virtual recreations [5], not only oriented to their future professional activities, but also to others related to the rescue and cataloguing of the aeronautical historical heritage [6].This paper presents the modelling and virtual recreation of the biplane Ansaldo SVA 5 [7], whose starting documentation consisted of handmade plans and documents relating to the various processes of verification of the aircraft project and the modifications made.

Injection Molding of Tissue Engineered Tympanic Membrane Patches Utilizing Computer-Aided Design

2001 ◽  
Author(s):  
Morgan E. Hott ◽  
Richard M. Beane ◽  
Cliff Megerian ◽  
Lawrence J. Bonassar
Keyword(s):  
General Anesthesia ◽  
Tympanic Membrane ◽  
Computer Aided Design ◽  
Surgical Repair ◽  
The United States ◽  
Office Procedure ◽  
Autologous Tissue ◽  
Tympanostomy Tubes ◽  
Aided Design ◽  
Membrane Patch

Abstract Over two million tympanostomy tubes are inserted annually in the United States, making this the most commonly performed of all surgical procedures (Isaacson 1996). In approximately 10% of cases the patient treated with tympanostomy tubes is left with a permanent perforation of the tympanic membrane that requires surgical repair. Current surgical technique involves grafting of an autologous tissue such as temporalis fascia or tragal cartilage to the perforated membrane (Paterson 1999). This is an involved surgical procedure requiring general anesthesia. We propose tissue engineering an autologous cartilage tympanic membrane patch. If successful this approach has the potential to transform an operating room procedure to an office procedure. This would provide tremendous healthcare savings, and potentially obviate the need for tens of thousands of children to undergo general anesthesia.

Representing the Charters of Freedom Encasements in a Design Repository: A Case Study

2001 ◽  
Author(s):  
R. H. Allen ◽  
R. J. Fijol ◽  
S. Szykman ◽  
R. D. Sriram
Keyword(s):  
Computer Aided Design ◽  
The United States ◽  
Specific Information ◽  
Design Rationale ◽  
Bill Of Rights ◽  
System A ◽  
Model Geometry ◽  
Aided Design ◽  
Generic Design

Abstract We report on a case study representing, in an evolving design repository, the design essence of new encasements for the United States Charters of Freedom (CoF) — namely the Constitution, the Declaration of Independence and the Bill of Rights. Specifically redesigned for the purpose of housing and preserving our national documents, the nine encasements each consist of three principal systems — a sealing system, a placement system and a safeguarding system. The encasements were needed to replace the ones manufactured in the early 1950s, because of glass deterioration; these newer encasements are designed to last 100 years. To populate the design repository, we represent engineering geometry, function and associated behavior. We model geometry with digital photographs and Virtual Reality Markup Language (VRML) models of actual Computer-Aided Design (CAD) drawings, and represent function with linked textual descriptions. Design rationale is represented explicitly. Through an evolving user interface, this representation serves to capture the more than 50 parts and systems of the encasements in such a way that the information relating to form, function, behavior and rationale is accessible and browsable to interested parties via the Internet. We conclude that such a representation, or ones similar to it, can provide the basis for a generic design repository, in which specific information — including design rationale — can be readily accessed by interested parties.

The 2-Visit CAD-CAM Implant-Retained Overdenture: A Clinical Report

2014 ◽  
Vol 40 (6) ◽  
pp. 722-728 ◽  
Author(s):  
Avinash S. Bidra
Keyword(s):  
United States ◽  
Computer Aided Design ◽  
Scientific Literature ◽  
The United States ◽  
Clinical Report ◽  
Complete Dentures ◽  
Advantages And Disadvantages ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design

Recently, computer-aided technology has become commercially available in the United States for fabrication of complete dentures. Manufacturers offering this technology require exclusive clinical and laboratory protocols that sharply contrast with the traditional paradigms of complete denture therapy. These protocols allow fabrication of complete dentures in only 2 clinical appointments. Currently, there are no clinical reports in the scientific literature describing the use of this technology for overdentures. This article describes the successful use of computer aided design-computer aided machining (CAD-CAM) technology for prosthodontic phase of fabrication of a mandibular implant-retained overdenture in only 2 clinical appointments. A discussion of the techniques, rationale, indications, advantages, and disadvantages of using CAD-CAM technology for complete dentures and overdentures are described in this article.

scholarly journals Design in Virtual Space

2007 ◽  
Vol 129 (08) ◽  
pp. 30-34
Author(s):  
Harry Hutchinson
Keyword(s):  
Computer Aided Design ◽  
Virtual Space ◽  
Traffic Flows ◽  
Virtual Design ◽  
Software Application ◽  
Virtual Tools ◽  
Group A ◽  
Aided Design ◽  
A Company ◽  
Video Demonstration

This article illustrates features of virtual tools and their increased use in the aerospace industry. According to engineers at Dema Group, a company based in Naples, Italy, there, virtual tools are giving them greater control over the development of composite parts. The company uses a software application called FiberSIM when it designs composite parts. FiberSIM works with computer-aided design (CAD) systems to include non-geometric data in models. Like FiberSIM, ADE software contains more than the geometry of the CAD model. As described by the company in its promotional literature, the software captures all nongeometric information related to parts, assemblies, joints, and fasteners. Software from Vistagy adds manufacturing information to models of composite parts and guides the laying of plies in the Dema Group factory. EON Reality has developed products for use in retail settings for the virtual design of apartment interiors and the customization of Suzuki motorcycles. In a video demonstration, the user’s hands give the commands that configure walls, place machinery, and define traffic flows.

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