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Design and analysis of new, quick-re...

Kim, Jinho.

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Design and analysis of new, quick-response, latching electromagnetic linear actuators.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design and analysis of new, quick-response, latching electromagnetic linear actuators./
Author:	Kim, Jinho.
Description:	123 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.
Contained By:	Dissertation Abstracts International66-08B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3187071
ISBN:	0542294354

Design and analysis of new, quick-response, latching electromagnetic linear actuators.
Kim, Jinho.

Design and analysis of new, quick-response, latching electromagnetic linear actuators. - 123 p.

Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.

Thesis (Ph.D.)--University of California, Berkeley, 2005.

The traditional valvetrain in the combustion engine is the mechanically driven camshaft system. It can provide one fixed valve timing determined by the shape of cams and engine crank angle, and the shape of cams is designed in view of the tradeoff among fuel efficiency, emissions, and engine torque and etc. This optimization of the shape of cams, however, is efficient at very short range of engine operation. Therefore, variable valve timing (VVT) is highly required to achieve the significant improvement in the fuel economy, lower emissions and better torque output.

ISBN: 0542294354Subjects--Topical Terms:

783786
Engineering, Mechanical.

Design and analysis of new, quick-response, latching electromagnetic linear actuators.
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020 $a 0542294354
035 $a (UnM)AAI3187071
035 $a AAI3187071
040 $a UnM $c UnM
100 1 $a Kim, Jinho. $3 1252027
245 1 0 $a Design and analysis of new, quick-response, latching electromagnetic linear actuators.
300 $a 123 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4447.
500 $a Adviser: Dennis K. Lieu.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2005.
520 $a The traditional valvetrain in the combustion engine is the mechanically driven camshaft system. It can provide one fixed valve timing determined by the shape of cams and engine crank angle, and the shape of cams is designed in view of the tradeoff among fuel efficiency, emissions, and engine torque and etc. This optimization of the shape of cams, however, is efficient at very short range of engine operation. Therefore, variable valve timing (VVT) is highly required to achieve the significant improvement in the fuel economy, lower emissions and better torque output.
520 $a To provide the variable valve timing to the combustion engine, several new devices using mechanical, electro-hydraulic, and electromagnetic principle have been studied and proposed in the past years. One device, which simple and provides great freedom in valve timing, is the double solenoid actuator. However, solenoid actuator of this type can provide the most flexible valve timing but have significant drawbacks such as a high current draw during start-up, and a continuous current necessary to latch the valve. These drawbacks result in poor power efficiency in valve operation.
520 $a In this dissertation, new electromagnetic engine valve actuators are introduced. To overcome the problems that double solenoid type of actuators has, permanent magnets are employed in proposed actuators. The new actuators introduced in following chapters are classified into two types. One is permanent magnet-nonmoving type and the other is permanent magnet-moving type. The performance and characteristics of proposed actuators are compared, and the advantages of proposed actuators over conventional double-solenoid actuator are studied.
520 $a Finite element (FE) analysis is performed to confirm their performance and characteristics. Several shortcomings in previous researches using the lumped parameter models to simulate electromagnetic engine valve system were found: the eddy current effects were not included, the nonlinear property of material was oversimplified, and the flux leakage to the air was neglected. The FE models in this dissertation dealt successfully with these shortcomings and presented more accurate simulation results. The results of simulations of the proposed actuator showed improvement in performance and a great possibility of practical employment.
590 $a School code: 0028.
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0548
710 2 0 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 66-08B.
790 1 0 $a Lieu, Dennis K., $e advisor
790 $a 0028
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3187071