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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Design of Structures and Number of Teeth of Dual-Clutch Countershaft Automatic Transmissions for Automobiles

Liang, Jhih-jyun 26 August 2009 (has links)
¡@¡@The countershaft transmission is a device connected between engine and driving wheel for transferring power. This device can provide variable gear ratios to maintain engine speed in certain operating range and is well applied for vehicle transmission systems for its high performance. In this thesis, the systematic design methodology for dual-clutch countershaft automatic transmission (DCT) is proposed. This methodology can provide a systematic design procedure for the gear box prototype, number of teeth, computer-aid program and preliminary layout. First, the fundamentals and gear-shifting operations for DCT are illustrated to establish the design requirements. Secondly, 12 kinds and 8 kinds for 7-speed DCT prototype are synthesized for the gear mechanism with FR type and FF type respectively. Then, according to both FR and FF types, calculate the proper number of teeth for ideal gear ratio and build the computer-aided calculating interface. Finally, the preliminary layouts of the above prototypes and number of teeth are built by CAD models. The result of this research will be beneficial for further newly DCT designs.
2

Controlled Start Transmission Wet Clutch Temperature Modeling and Application

Martinsson, Joel January 2015 (has links)
Controlled Start Transmissions (CST) can be described as a mechanical transmission combined with a wet clutch for controlled torque output. CST:s are commonly used to start up heavy loads for example mining conveyors. Several CST:s can work together to share the load. The transferred torque is controlled by a hydraulic wet clutch which is a proven technology for high torque transfer and low wear. This thesis is a part of a project to increase the knowledge and improve the CST design and control performance. The heat generation in the wet clutch is the focus of this thesis. Literature review shows that most research is done in order to get high accuracy for smaller clutches and most of the high torque engagements have very short transients.Models for the CST clutch heat generation together with thermal behavior have been developed and investigated. This includes a temperature model together with a kinetic model of the gearbox and a clutch torque model. Validation of separate model components and sensitivity analysis of the parameters are made. The developed model is then analyzed by comparing measurements from a commission site and simulations to get an idea of how much heat is generated.
3

Development studies of a new one-way clutch mechanism

Burgess, Stuart Clyde January 1989 (has links)
No description available.
4

Individual variation of clutch-size in tits

Pettifor, Richard A. January 1989 (has links)
No description available.
5

Modeling and estimation for stepped automatic transmission with clutch-to-clutch shift technology

Watechagit, Sarawoot 30 September 2004 (has links)
No description available.
6

Electro-rheological fluid : fast response torque actuator application

Makin, John January 2001 (has links)
No description available.
7

Some causes and consequences of family size in the Canada goose Branta canadensis

Lessells, Catherine M. January 1982 (has links)
No description available.
8

Emergência e desenvolvimento da ação nos apertos manuais de bebês / Emergence and development of the action of clutch behavior in infants

Ferronato, Priscilla Augusta Monteiro 15 May 2015 (has links)
Esse estudo tem como tese que o comportamento de recém nascidos e bebês é ativo, ou seja, guiado a uma meta específica e baseado no conhecimento a respeito do ambiente ao seu redor. Também é assumido que essa capacidade de adaptação se fortaleça ao longo dos 4 primeiros meses após o nascimento. Foram investigadas as atividades manuais de recém nascidos e bebês, tendo em vista que as mãos são uma importante ferramenta de percepção e interação com o ambiente. Assim, os objetivos do estudo foram: a) descrever o comportamento de apertar ao longo dos 4 primeiros meses após o nascimento; e b) identificar acoplamentos entre apertos manuais e o contexto ambiental durante os quatro primeiro meses após o nascimento. Os resultados mostraram que os bebês alteraram a organização temporal dos apertos diferentemente nas situações de contingência e não contingência, um indicativo inicial do comportamento ativo nos apertos manuais / This thesis searched for evidences that newborns and infants behaviour are active, in the other words, intentional, guide by a goal and based in environment knowledge. Also, it is suggested that the adaptation capacity improve around the first 4 months of age Thereunto, the manual activities were investigate, because the hand is an important font of perception and interaction with the environment. So, the goals of the study were: a) to describe neonate and infant clutches around four first months after birth; and b) to verify the coupling between clutches and environmental outcomes during the first four months after birth. The results showed that infants could alter the temporal organization of clutches differently in contingent and no contingent conditions, an initial indicative of active clutch behaviour in young infants
9

Design and Analysis of a Rapid Kinetic Energy Transmission Mechanism

Benson, Brian C 26 April 2011 (has links)
The rapid release of energy in mechanisms is often limited by conversion of potential energy to kinetic energy. The use of a flywheel to store energy over time eliminates this constraint. Using this principle, a lightweight and compact energy transmission mechanism has been developed for robotic combat applications. The purpose of the proposed design is to throw an opposing robot ten or more feet into the air. This design incorporates a flywheel, a self-resetting dog clutch with built in shock absorbing rubber for impact mitigation, and an optimized four-bar linkage to deliver the energy. A mathematical model of the dynamic system has been developed to analyze and aid in the design process. Testing of subsystems was performed to validate the design. A final design is proposed with the recommendation that it be built and tested. A validated design is applicable to many real-world problems that require rapid kinetic energy release including reconnaissance robots required to hop high fences.
10

Emergência e desenvolvimento da ação nos apertos manuais de bebês / Emergence and development of the action of clutch behavior in infants

Priscilla Augusta Monteiro Ferronato 15 May 2015 (has links)
Esse estudo tem como tese que o comportamento de recém nascidos e bebês é ativo, ou seja, guiado a uma meta específica e baseado no conhecimento a respeito do ambiente ao seu redor. Também é assumido que essa capacidade de adaptação se fortaleça ao longo dos 4 primeiros meses após o nascimento. Foram investigadas as atividades manuais de recém nascidos e bebês, tendo em vista que as mãos são uma importante ferramenta de percepção e interação com o ambiente. Assim, os objetivos do estudo foram: a) descrever o comportamento de apertar ao longo dos 4 primeiros meses após o nascimento; e b) identificar acoplamentos entre apertos manuais e o contexto ambiental durante os quatro primeiro meses após o nascimento. Os resultados mostraram que os bebês alteraram a organização temporal dos apertos diferentemente nas situações de contingência e não contingência, um indicativo inicial do comportamento ativo nos apertos manuais / This thesis searched for evidences that newborns and infants behaviour are active, in the other words, intentional, guide by a goal and based in environment knowledge. Also, it is suggested that the adaptation capacity improve around the first 4 months of age Thereunto, the manual activities were investigate, because the hand is an important font of perception and interaction with the environment. So, the goals of the study were: a) to describe neonate and infant clutches around four first months after birth; and b) to verify the coupling between clutches and environmental outcomes during the first four months after birth. The results showed that infants could alter the temporal organization of clutches differently in contingent and no contingent conditions, an initial indicative of active clutch behaviour in young infants

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