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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.

Experimental investigation of an actively controlled mechanical seal

Wolff, Paul 08 1900 (has links)
No description available.

The rotordynamic coefficients of mechanical face seals having two flexibly-mounted rotors

Wileman, James Michael 08 1900 (has links)
No description available.

Dynamic analysis of eccentric mechanical face seals

Wileman, James Michael 12 1900 (has links)
No description available.

A deterministic mixed-elastohydrodynamic lubrication model and analysis of lip seal performance

Shi, Fanghui 05 1900 (has links)
No description available.

Real-time monitoring and control of a noncontacting mechanical face seal

Zou, Min 12 1900 (has links)
No description available.

The dynamic stability of two-phase mechanical seals

Blasbalg, David A. 05 1900 (has links)
No description available.

The selection and testing of compression seal and chamber coating materials for the pivotal engine™.

Miller, David J January 2006 (has links)
Wear and friction tests were conducted on a rotational tribometer to identify material couples for compression seals and chamber coatings to extend the service life of the Pivotal Engine™. Potential materials were identified based on reports in the literature of successful use in similar environments. From the rotational tribometer tests, the best material couple was found to be reaction bonded silicon nitride against a Sulzer Metco F4301 plasma sprayed coating followed by a Total Seal TiN coated seal against the F4301 coating. However, the performance predicted by the rotational tribometer was not realised in a fired engine, where the TiN coated seal wore almost as fast as an uncoated seal. This discrepancy was due to the large differences in operating conditions between the rotational tribometer and the fired engine, particularly the reciprocating motion of the engine. The different operating conditions mean that the results from the rotational tribometer have little or no relevance actual performance in the engine. To overcome the limitations of the rotational tribometer a reciprocating tribometer was designed and built. The performance predicted by the reciprocating tribometer was much closer to the observed wear rates from the engine, particularly with the Total Seal TiN coated seals. Some of the results from the reciprocating tribometer were a direct-contradiction to those obtained on the rotational tribometer. When tested on the rotational tribometer the nitrided stainless steel seal wear rate was lower than that of the Mazda cast iron seal. However, on the reciprocating tribometer the Mazda cast iron seal had a lower wear rate than the nitrided stainless steel seal. From the testing conducted on the reciprocating tribometer the best material couple was found to be Total Seal TiN coated seals on the F4301 chamber coating. However, this material couple cannot be recommended to increase the seal life in the Pivotal Engine™ because at the conclusion of a twenty hour test the Total Seal TiN coating had worn through to the substrate. In addition to testing different materials, different oils were tested while keeping the wear couple constant. The oil that offered the best wear protection to both the seal and chamber coating was Castrol A747. These tests showed that different oils have as much effect as different materials. Even with the best material combinations (Total Seal TiN seal, F4301 chamber coating) the seal wear rates in the Pivotal Engine™ are much higher than would be expected in other engines. This leads to the hypothesis that the origin of high seal wear in the Pivotal Engine™ is not due to material properties, but to design issues. The most likely problem is distortion of the chamber, which causes high localised seal loadings, and in turn causing high seal wear.

Evaluation of pavement joint sealants : a new testing technique /

Abo-Qudais, Saad A., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 87-89). Also available via the Internet.

The transverse bonding of wood elements

Quirk, John T., January 1967 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The stimulation of innovation advantage through autonomous intrapreneurship at Federal Mogul Sealing Systems South Africa

Morgan, Beverley Ann January 2006 (has links)
In the rapidly evolving organisational landscapes of today, the quest to grow or sustain competitive advantage demands that organisational practices become more innovative, hence innovative advantage. Globalisation and technological advances drive the necessity for innovation within organisational contexts and the resultant rapid pace of change demands that organisations adopt an intrapreneurial orientation to accommodate this need for innovation. South African organisations, in particular those within the automotive sector, are faced with both unique opportunities and threats as a result of the increased impact of globalisation and the resultant open markets in the post-apartheid era. Programs offered by governmental institutions for this industry sector, such as the Motor Industry Development Programme (MIDP), as well as widely promoted systems such as those engendered by continuous improvement and benchmarking to achieve excellence, are successful only in attaining uniformity and incremental improvements and one-dimensional thinking methodologies. The quest for innovation advantage requires increased creative activity to assist individuals within these organisations in adopting an intrapreneurial outlook to provide proactive solutions. The literature survey has revealed that top-down controls and centralised decision-making as provided by corporate entrepreneurship, is the antithesis of intrapreneurship. Intrapreneurship is thus an autonomous process. Federal Mogul Sealing Systems (FMSS), an automotive component manufacturer within the Eastern Cape served as the basis for this study. A detailed literature review was conducted and a questionnaire was drawn up and distributed in an attempt to assess the three prevalent elements for the creation of innovation advantage through intrapreneurship as reviewed in the literature survey. The three elements were: individual intrapreneurial traits, organisational barriers and enablers of intrapreneurship and the influence of precipitating events on intrapreneurship. The research was conducted and recommendations were made based on the objectives of this study in relation to the organisation under study, FMSS.

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