This paper describes an investigation carried out to study the fatigue failures of a "keyed tapered-shaft assembly" as affected by the keyway. Two fatigue testing machines were built and used: one tested a keyed assembly in reversed bending, and the other tested a keyed assembly in reversed torsion or a combination of reversed bending and reversed torsion. Both sled-runner and round-ended keyways were tested and the failures were compared with a view to establishing a law of failure. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

No description available.

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Ocean Engineering. / Microfiche copy available in Archives and Engineering. / Includes bibliographical references. / M.S.

An open source, MATLAB (trademarked)-based propeller design code MPVL was improved to include rapid prototyping capabilities as well as other upgrades as part of this effort. The resulting code, OpenPVL is described in this thesis. In addition, results from the development code BasicPVL are presented. An intermediate code, BasicPVL, was created by the author while OpenPVL was under development, and it provides guidance for initial propeller designs and propeller efficiency analysis. OpenPVL is part of the open source software suite of propeller design codes, Openprop. OpenPVL is in the form of a Graphical User Interface (GUI) which features both a parametric design technique and a single propeller geometry generator. This code combines a user-friendly interface with a highly modifiable platform for advanced users. This tool offers graphical propeller design feedback while recording propeller input, output, geometry, and performance. OpenPVL features the ability to translate the propeller design geometry into a file readable by a Computer Aided Design (CAD) program and converted into a 3D-printable file. Efficient propellers reduce the overall power requirements for Autonomous Underwater Vehicles (AUVs), and other propulsion-powered vehicles. The focus of this study is based on the need of propeller users to have an open source computer-based engineering tool for the rapid design of propellers suited to a wide range of underwater vehicles. Propeller vortex lattice lifting line (PVL) code in combination with 2D foil theory optimizes propeller design for AUVs. Several case studies demonstrate the functionality of OpenPVL, and serve as guides for future propeller designs. The first study analyzes propeller thruster performance characteristics for an off-the-shelf propeller, while the second study demonstrates the process for propeller optimization-from the initial design to the final file that can be read by a 3D printer. / Contract number: N62771-97-G-0026 / US Naval Academy (USNA) author.

The use of surface piercing propellers (SPPs) shows promise for high speed operation by virtually eliminating appendage drag, which can be as much as 30 percent of the total drag on a vehicle at high speeds. The scarcity of available systematic test data has made reliable performance prediction difficult. The primary objective of this research is to obtain experimental performance prediction data that can be used in SPP design. In a series of open water tests in a non-pressurized towing tank facility, force transducer measurements were taken at tip immersion ratios from 0.5 to .33, yaw angles from 0° to 30° and inclination angles from 0° to 15° over a range of advance ratios from 0.8 to 1.8. Force transducer measurements were taken for thrust, torque, side forces and moments. These results will help develop a baseline for the verification of SPP performance prediction. / by Justin M. Lorio. / Thesis (M.S.C.S.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Ocean Engineering. / Microfiche copy available in Archives and Engineering. / Includes bibliographical references. / M.S.

No description available.

No description available.

<p>This bachelor’s degree project has been conducted at the Innovation and Design Engineering programme at Karlstad University and responds to 22.5 ETCS credits. The project has been carried out in co-operation with Rolls-Royce AB in Kristinehamn.</p><p>Based upon a virtual order concerning a super yacht the objective has been to develop a controllable pitch propeller that is adjusted using electro mechanics, to eliminate the use of hydraulic oils and thus the risk of leakage to the seawater.</p><p>The pre-study consisted of the two first phases of QFD-analysis (Quality Function Deployment). The first phase consists of gathering customer requirements. Representatives from different functions within Rolls-Royce AB were interviewed, as representatives for the customer. The demands they presented were used to find product features and functionalities.</p><p>The results were put together in two Houses of Quality. The first house shows the relations between requirements and features/functionalities and their respective relevance in correlation to each other. House of Quality two describes the relations between features/functionalities and design solutions in a similar way.</p><p>Based upon the QFD-analysis, a specification was generated to be used as guidance to generate ideas of how to solve the problem. A number of brainstorming methods were used and students from Karlstad University and Rolls-Royce AB participated in those sessions. Overall, some twenty ideas were gathered and five of those were considered feasible concepts.</p><p>For further development, two of those concepts were chosen, using relative and weighted decision matrixes. This development consisted of solid modelling, based on current propeller arrangement designs, and stress calculations of the new parts of the system.</p><p>Both concepts consist of an electrical engine, powering a trapezoid screw, which moves the crosshead. In Concept 1, the screw is mounted directly into the crosshead while in Concept 2; a push rod is used to transmit the motion. Both concepts appeared to meet up to the objectives, though Concept 1 fulfilled more demands and to a greater extent.</p><p>For further development of this product, customer inquiries with closer customer contacts need to be conducted. It will also be necessary to contact the concerned classing societies, since current classification rules not can be applied to electromechanically controlled propellers.</p> / <p>Detta examensarbete har utförts för examen på Innovations- och designingenjörsprogrammet vid Karlstads universitet och motsvarar 22,5 hp. Projektet har genomförts tillsammans med Rolls-Royce AB i Kristinehamn.</p><p>Baserad på en virtuell order på en superyacht har målet varit att utveckla en justerbar propeller som regleras helt med elektromekanik. Detta för att eliminera användandet av hydraulolja och därmed risken för läckage till havsvattnet.</p><p>Förstudien har bestått av de två första faserna av QFD-studie (Quality Function Deployment). Den första fasen består av insamlande av kundernas önskemål. Olika representanter inom företaget, som fått representera slutkunden, intervjuades och de önskemål som kom fram användes för att hitta produktegenskaper och funktioner.</p><p>Resultaten sammanställdes i två kvalitetshus (House of Quality). Det första visar förhållandet mellan önskemål och egenskaper/funktioner samt deras respektive relevans i förhållande till varandra. Hus två beskriver på samma sätt förhållandet mellan egenskaper/funktioner och konstruktionslösningar.</p><p>Utifrån QFD-studien sammanställdes en specifikation som användes som mall för att generera idéer kring lösningen av problemet. Ett antal olika kreativitetsmetoder användes och studenter från Karlstads universitet samt anställda från Rolls-Royce AB deltog i sessionerna. Totalt togs ett tjugotal idéer fram och fem av dessa bedömdes vara genomförbara koncept.</p><p>Två av koncepten valdes ut, med hjälp av en relativ viktad kriterievalsmatris, för att utvecklas vidare. Utvecklingen bestod i att göra solidmodeller, baserat på de befintliga delarna i propellerarrangemanget, samt hållfasthetsberäkningar av de nya delar som kom att ingå i systemet.</p><p>Båda koncepten bygger på att en trapetsgängad skruv, driven av en elmotor, förflyttar kolvstångshuvudet. I koncept 1 är skruven monterad direkt i detta och i koncept 2 överförs rörelsen via en tryckstång. Båda koncepten föreföll sig lösa det uppsatta problemet även om koncept 1 visade sig uppfylla fler önskemål och i högre utsträckning.</p><p>För att komma vidare med produkten bör kundundersökningar med närmare kontakter till kunden genomföras. Det är också nödvändigt att kontakta berörda klassningssällskap, då dagens klassningsregler ej kan appliceras på elektromekaniska propellrar.</p>

This bachelor’s degree project has been conducted at the Innovation and Design Engineering programme at Karlstad University and responds to 22.5 ETCS credits. The project has been carried out in co-operation with Rolls-Royce AB in Kristinehamn. Based upon a virtual order concerning a super yacht the objective has been to develop a controllable pitch propeller that is adjusted using electro mechanics, to eliminate the use of hydraulic oils and thus the risk of leakage to the seawater. The pre-study consisted of the two first phases of QFD-analysis (Quality Function Deployment). The first phase consists of gathering customer requirements. Representatives from different functions within Rolls-Royce AB were interviewed, as representatives for the customer. The demands they presented were used to find product features and functionalities. The results were put together in two Houses of Quality. The first house shows the relations between requirements and features/functionalities and their respective relevance in correlation to each other. House of Quality two describes the relations between features/functionalities and design solutions in a similar way. Based upon the QFD-analysis, a specification was generated to be used as guidance to generate ideas of how to solve the problem. A number of brainstorming methods were used and students from Karlstad University and Rolls-Royce AB participated in those sessions. Overall, some twenty ideas were gathered and five of those were considered feasible concepts. For further development, two of those concepts were chosen, using relative and weighted decision matrixes. This development consisted of solid modelling, based on current propeller arrangement designs, and stress calculations of the new parts of the system. Both concepts consist of an electrical engine, powering a trapezoid screw, which moves the crosshead. In Concept 1, the screw is mounted directly into the crosshead while in Concept 2; a push rod is used to transmit the motion. Both concepts appeared to meet up to the objectives, though Concept 1 fulfilled more demands and to a greater extent. For further development of this product, customer inquiries with closer customer contacts need to be conducted. It will also be necessary to contact the concerned classing societies, since current classification rules not can be applied to electromechanically controlled propellers. / Detta examensarbete har utförts för examen på Innovations- och designingenjörsprogrammet vid Karlstads universitet och motsvarar 22,5 hp. Projektet har genomförts tillsammans med Rolls-Royce AB i Kristinehamn. Baserad på en virtuell order på en superyacht har målet varit att utveckla en justerbar propeller som regleras helt med elektromekanik. Detta för att eliminera användandet av hydraulolja och därmed risken för läckage till havsvattnet. Förstudien har bestått av de två första faserna av QFD-studie (Quality Function Deployment). Den första fasen består av insamlande av kundernas önskemål. Olika representanter inom företaget, som fått representera slutkunden, intervjuades och de önskemål som kom fram användes för att hitta produktegenskaper och funktioner. Resultaten sammanställdes i två kvalitetshus (House of Quality). Det första visar förhållandet mellan önskemål och egenskaper/funktioner samt deras respektive relevans i förhållande till varandra. Hus två beskriver på samma sätt förhållandet mellan egenskaper/funktioner och konstruktionslösningar. Utifrån QFD-studien sammanställdes en specifikation som användes som mall för att generera idéer kring lösningen av problemet. Ett antal olika kreativitetsmetoder användes och studenter från Karlstads universitet samt anställda från Rolls-Royce AB deltog i sessionerna. Totalt togs ett tjugotal idéer fram och fem av dessa bedömdes vara genomförbara koncept. Två av koncepten valdes ut, med hjälp av en relativ viktad kriterievalsmatris, för att utvecklas vidare. Utvecklingen bestod i att göra solidmodeller, baserat på de befintliga delarna i propellerarrangemanget, samt hållfasthetsberäkningar av de nya delar som kom att ingå i systemet. Båda koncepten bygger på att en trapetsgängad skruv, driven av en elmotor, förflyttar kolvstångshuvudet. I koncept 1 är skruven monterad direkt i detta och i koncept 2 överförs rörelsen via en tryckstång. Båda koncepten föreföll sig lösa det uppsatta problemet även om koncept 1 visade sig uppfylla fler önskemål och i högre utsträckning. För att komma vidare med produkten bör kundundersökningar med närmare kontakter till kunden genomföras. Det är också nödvändigt att kontakta berörda klassningssällskap, då dagens klassningsregler ej kan appliceras på elektromekaniska propellrar.