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Fully pneumatic semi-active vibratio...

Schaeffer, Hans William.

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Fully pneumatic semi-active vibration isolator design and analysis.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fully pneumatic semi-active vibration isolator design and analysis./
Author:	Schaeffer, Hans William.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	135 p.
Notes:	Source: Masters Abstracts International, Volume: 57-01.
Contained By:	Masters Abstracts International57-01(E).
Subject:	Automotive engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10282318
ISBN:	9780355334661

Fully pneumatic semi-active vibration isolator design and analysis.
Schaeffer, Hans William.

Fully pneumatic semi-active vibration isolator design and analysis. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 135 p.

Source: Masters Abstracts International, Volume: 57-01.

Thesis (M.S.)--Iowa State University, 2017.

The research presented in this thesis provides a methodology of designing, modeling and controlling a fully pneumatic semi-active vibration isolator system. The prototype vibration isolator system has the ability to adjust the damping and natural frequency characteristics of the system. It consists of an air spring, a variable orifice valve, and an accumulator. In this configuration, the spring characteristics are provided by the air spring and accumulator, while the variable orifice valve provides the damping characteristics. The valve is computer regulated according to the innovative control laws that were developed for the pneumatic system. The vibration isolator system is designed to work in the vibration environment that is typically observed in the case of Class 7 and 8 vehicles as defined by the U.S Department of Transportation Federal Highway Administration. In order to design a vibration isolator system for the intended application, a benchmarking study was conducted to gain additional insight on OEM vibration isolator systems features and limitations. Based on the insights obtained from this study, the design requirements for the system were defined.

ISBN: 9780355334661Subjects--Topical Terms:

2181195
Automotive engineering.

Fully pneumatic semi-active vibration isolator design and analysis.
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100 1 $a Schaeffer, Hans William. $3 3348342
245 1 0 $a Fully pneumatic semi-active vibration isolator design and analysis.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 135 p.
500 $a Source: Masters Abstracts International, Volume: 57-01.
500 $a Adviser: Atul G. Kelkar.
502 $a Thesis (M.S.)--Iowa State University, 2017.
520 $a The research presented in this thesis provides a methodology of designing, modeling and controlling a fully pneumatic semi-active vibration isolator system. The prototype vibration isolator system has the ability to adjust the damping and natural frequency characteristics of the system. It consists of an air spring, a variable orifice valve, and an accumulator. In this configuration, the spring characteristics are provided by the air spring and accumulator, while the variable orifice valve provides the damping characteristics. The valve is computer regulated according to the innovative control laws that were developed for the pneumatic system. The vibration isolator system is designed to work in the vibration environment that is typically observed in the case of Class 7 and 8 vehicles as defined by the U.S Department of Transportation Federal Highway Administration. In order to design a vibration isolator system for the intended application, a benchmarking study was conducted to gain additional insight on OEM vibration isolator systems features and limitations. Based on the insights obtained from this study, the design requirements for the system were defined.
520 $a This paper presents a methodology of producing a plant model that is based on supplier's engineering specifications and experimental characterization. The plant model includes a complete characterization of nonlinear pressure to volume and effective area to ride height relationships. A detailed design process of selecting and implementing components to optimize system performance is also provided. The plant model was then used to design three semiactive controllers that use position and pressure feedback signals that exploit the nonlinear characterizations to measure direct force generation. The semi-active controllers that were designed for this novel pneumatic vibration isolator system include: a LQI (Linear Quadratic Impulse) optimal controller, Modified Skyhook controller, and a Relative Displacement controller. This vibration isolator system was designed, fabricated, and tested using a prototype electronic height control system. A comprehensive design process for the specialized height control system is also presented.
520 $a The performance of the system was evaluated using a custom testing apparatus that was built specifically for this vibration isolator research. The testing apparatus was designed to accommodate different isolator systems and excite them with simulated road disturbances to obtain head-to-head system comparisons. This research presents a comparison between the system performances of an OEM Peterbilt cab suspension unit and the innovative fully pneumatic semi-active vibration isolator prototype using the three different control laws. It was found that the properly tuned controllers were able to provide desired dynamic characteristics over the range of common ride frequencies.
590 $a School code: 0097.
650 4 $a Automotive engineering. $3 2181195
690 $a 0540
710 2 $a Iowa State University. $b Mechanical Engineering. $3 1023689
773 0 $t Masters Abstracts International $g 57-01(E).
790 $a 0097
791 $a M.S.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10282318