Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(bundle level method). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Florida

1. Zhang, Wei. Accelerated Bundle Level Type Methods for Large Scale Convex Optimization.

Degree: PhD, Mathematics, 2017, University of Florida

Subjects/Keywords: accelerated-algorithm; bundle-level-method; convex-optimization

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zhang, W. (2017). Accelerated Bundle Level Type Methods for Large Scale Convex Optimization. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0051299

Chicago Manual of Style (16th Edition):

Zhang, Wei. “Accelerated Bundle Level Type Methods for Large Scale Convex Optimization.” 2017. Doctoral Dissertation, University of Florida. Accessed July 19, 2019. http://ufdc.ufl.edu/UFE0051299.

MLA Handbook (7th Edition):

Zhang, Wei. “Accelerated Bundle Level Type Methods for Large Scale Convex Optimization.” 2017. Web. 19 Jul 2019.

Vancouver:

Zhang W. Accelerated Bundle Level Type Methods for Large Scale Convex Optimization. [Internet] [Doctoral dissertation]. University of Florida; 2017. [cited 2019 Jul 19]. Available from: http://ufdc.ufl.edu/UFE0051299.

Council of Science Editors:

Zhang W. Accelerated Bundle Level Type Methods for Large Scale Convex Optimization. [Doctoral Dissertation]. University of Florida; 2017. Available from: http://ufdc.ufl.edu/UFE0051299


University of Manchester

2. Li, Qi. Acoustic noise emitted from overhead line conductors.

Degree: PhD, 2013, University of Manchester

The developments of new types of conductors and increase of voltage level have driven the need to carry out research on evaluating overhead line acoustic noise. The surface potential gradient of a conductor is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometries. This thesis proposes a novel method which utilizes both analytical and numerical procedures to predict the surface gradient. Stranding shape, proximity of tower, protrusions and bundle arrangements are considered within this model. One of UK National Grid's transmission line configurations has been selected as an example to compare the results for different methods. The different stranding shapes are a key variable in determining dry surface fields. The dynamic behaviour of water droplets subject to AC electric fields is investigated by experiment and finite element modelling. The motion of a water droplet is considered on the surface of a metallic sphere. To understand the consequences of vibration, the FEA model is introduced to study the dynamics of a single droplet in terms of phase shift between vibration and exciting voltage. Moreover, the evolution of electric field within the whole cycle of vibration is investigated. The profile of the electric field and the characteristics of mechanical vibration are evaluated. Surprisingly the phase shift between these characteristics results in the maximum field occurring when the droplet is in a flattened profile rather than when it is ‘pointed’.Research work on audible noise emitted from overhead line conductors is reviewed, and a unique experimental set up employing a semi-anechoic chamber and corona cage is described. Acoustically, this facility isolates undesirable background noise and provides a free-field test space inside the anechoic chamber. Electrically, the corona cage simulates a 3 m section of 400 kV overhead line conductors by achieving the equivalent surface gradient. UV imaging, acoustic measurements and a partial discharge detection system are employed as instrumentation. The acoustic and electrical performance is demonstrated through a series of experiments. Results are discussed, and the mechanisms for acoustic noise are considered. A strategy for evaluating the noise emission level for overhead line conductors is developed. Comments are made on predicting acoustic noise from overhead lines. The technical achievements of this thesis are summarized in three aspects. First of all, an FEA model is developed to calculate the surface electric field for overhead line conductors and this has been demonstrated as an efficient tool for power utilities in computing surface electric field especially for dry condition. The second achievement is the droplet vibration study which describes the droplets' behaviour under rain conditions, such…

Subjects/Keywords: 620.2; audible noise; overhead line conductor; surface potential gradient; electric field calculation; transmission line; conductor bundle; successive image method; charge simulation method; finite element method; high speed camera; droplet vibration; cage experiment; anechoic chamber; hum noise; sound pressure level; free field microphone; partial discharge measurement; UV camera; corona inception; spray system; FFT; A-weighted sound pressure level; overall sound pressure level; hydrophobicity; contact angle

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Li, Q. (2013). Acoustic noise emitted from overhead line conductors. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607107

Chicago Manual of Style (16th Edition):

Li, Qi. “Acoustic noise emitted from overhead line conductors.” 2013. Doctoral Dissertation, University of Manchester. Accessed July 19, 2019. https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607107.

MLA Handbook (7th Edition):

Li, Qi. “Acoustic noise emitted from overhead line conductors.” 2013. Web. 19 Jul 2019.

Vancouver:

Li Q. Acoustic noise emitted from overhead line conductors. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2019 Jul 19]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607107.

Council of Science Editors:

Li Q. Acoustic noise emitted from overhead line conductors. [Doctoral Dissertation]. University of Manchester; 2013. Available from: https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607107

3. Li, Qi. Acoustic Noise Emitted from Overhead Line Conductors.

Degree: 2013, University of Manchester

The developments of new types of conductors and increase of voltage level have driven the need to carry out research on evaluating overhead line acoustic noise.The surface potential gradient of a conductor is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometries. This thesis proposes a novel method which utilizes both analytical and numerical procedures to predict the surface gradient. Stranding shape, proximity of tower, protrusions and bundle arrangements are considered within this model. One of UK National Grid's transmission line configurations has been selected as an example to compare the results for different methods. The different stranding shapes are a key variable in determining dry surface fields.The dynamic behaviour of water droplets subject to AC electric fields is investigated by experiment and finite element modelling. The motion of a water droplet is considered on the surface of a metallic sphere. To understand the consequences of vibration, the FEA model is introduced to study the dynamics of a single droplet in terms of phase shift between vibration and exciting voltage. Moreover, the evolution of electric field within the whole cycle of vibration is investigated. The profile of the electric field and the characteristics of mechanical vibration are evaluated. Surprisingly the phase shift between these characteristics results in the maximum field occurring when the droplet is in a flattened profile rather than when it is ‘pointed’.Research work on audible noise emitted from overhead line conductors is reviewed, and a unique experimental set up employing a semi-anechoic chamber and corona cage is described. Acoustically, this facility isolates undesirable background noise and provides a free-field test space inside the anechoic chamber. Electrically, the corona cage simulates a 3 m section of 400 kV overhead line conductors by achieving the equivalent surface gradient. UV imaging, acoustic measurements and a partial discharge detection system are employed as instrumentation. The acoustic and electrical performance is demonstrated through a series of experiments. Results are discussed, and the mechanisms for acoustic noise are considered. A strategy for evaluating the noise emission level for overhead line conductors is developed. Comments are made on predicting acoustic noise from overhead lines.The technical achievements of this thesis are summarized in three aspects. First of all, an FEA model is developed to calculate the surface electric field for overhead line conductors and this has been demonstrated as an efficient tool for power utilities in computing surface electric field especially for dry condition. The second achievement is the droplet vibration study which describes the droplets' behaviour under rain conditions, such as… Advisors/Committee Members: Rowland, Simon, Shuttleworth, Roger.

Subjects/Keywords: audible noise; overhead line conductor; surface potential gradient; electric field calculation; transmission line; conductor bundle; successive image method; charge simulation method; finite element method; high speed camera; droplet vibration; cage experiment; anechoic chamber; hum noise; sound pressure level; free field microphone; partial discharge measurement; UV camera; corona inception; spray system; FFT; A-weighted sound pressure level; overall sound pressure level; hydrophobicity; contact angle

bundle at each voltage level is pushing the limits of the existing knowledge. New towers are… …suggest a method of calculating the conductor surface electric field of a bundle conductor in… …Method. It is also demonstrated in simulation that for a typical National Grid twin bundle… …the Successive Images Method during the last Vertical distance from the centre of bundle… …gradient above a certain level......................................... 68 Figure 3-33… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Li, Q. (2013). Acoustic Noise Emitted from Overhead Line Conductors. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:215521

Chicago Manual of Style (16th Edition):

Li, Qi. “Acoustic Noise Emitted from Overhead Line Conductors.” 2013. Doctoral Dissertation, University of Manchester. Accessed July 19, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:215521.

MLA Handbook (7th Edition):

Li, Qi. “Acoustic Noise Emitted from Overhead Line Conductors.” 2013. Web. 19 Jul 2019.

Vancouver:

Li Q. Acoustic Noise Emitted from Overhead Line Conductors. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2019 Jul 19]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:215521.

Council of Science Editors:

Li Q. Acoustic Noise Emitted from Overhead Line Conductors. [Doctoral Dissertation]. University of Manchester; 2013. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:215521

.