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Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements./
Author:	Liao, Wei-Hsin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1997,
Description:	159 p.
Notes:	Source: Dissertations Abstracts International, Volume: 59-02, Section: B.
Contained By:	Dissertations Abstracts International59-02B.
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9732313
ISBN:	9780591419405

Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements.
Liao, Wei-Hsin.

Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements. - Ann Arbor : ProQuest Dissertations & Theses, 1997 - 159 p.

Source: Dissertations Abstracts International, Volume: 59-02, Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 1997.

This item must not be sold to any third party vendors.

This thesis consists of two parts: (1) analysis of the current active constrained layer (ACL) damping treatment; (2) development and analysis of a new and enhanced ACL (EACL) configuration. Analysis illustrates that the ACL treatments can enhance the damping ability of the passive constrained layer (PCL) system. However, it is also recognized that the viscoelastic layer will reduce the direct control authorities from the active source to the host structure. The significance of these effects depends very much on the viscoelastic layer thickness and material properties. This study has identified the viscoelastic material (VEM) parameter regions that will provide the satisfactory active-passive hybrid actions. A new EACL configuration is proposed to improve the active action transmissibility of the current ACL treatment. Introducing edge elements, the active action from the piezoelectric cover sheet can be transmitted to the host structure more directly. It is recognized that the bypass effect of the edge elements can significantly improve the active action transmissibility of the ACL treatment, and the EACL could even achieve more control authority than a purely active configuration. On the other hand, the edge elements will slightly reduce the VEM passive damping effect. However, the EACL system will still have significant passive damping from the VEM. Combining the hybrid active and passive actions, the EACL with sufficiently stiff edge elements not only could outperform the ACL, but also could perform better than the purely active system. It is concluded that the system performance is very related to the stiffness of the edge elements. With careful analysis, we can map out the required critical stiffness for successful designs. In addition, analysis also shows that the EACL treatment is a more robust design. That is, it could outperform both the PCL and the purely active systems throughout a much broader design space than the ACL configuration. With these desirable characteristics, the EACL could be used to realize an overall optimal active-passive hybrid system.

ISBN: 9780591419405Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

piezoelectric

Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements.
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020 $a 9780591419405
035 $a (MiAaPQ)AAI9732313
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100 1 $a Liao, Wei-Hsin. $3 3681564
245 1 0 $a Active-passive hybrid structural control: An enhanced active constrained layer damping treatment with edge elements.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1997
300 $a 159 p.
500 $a Source: Dissertations Abstracts International, Volume: 59-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Wang, Kon-Well.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1997.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a This thesis consists of two parts: (1) analysis of the current active constrained layer (ACL) damping treatment; (2) development and analysis of a new and enhanced ACL (EACL) configuration. Analysis illustrates that the ACL treatments can enhance the damping ability of the passive constrained layer (PCL) system. However, it is also recognized that the viscoelastic layer will reduce the direct control authorities from the active source to the host structure. The significance of these effects depends very much on the viscoelastic layer thickness and material properties. This study has identified the viscoelastic material (VEM) parameter regions that will provide the satisfactory active-passive hybrid actions. A new EACL configuration is proposed to improve the active action transmissibility of the current ACL treatment. Introducing edge elements, the active action from the piezoelectric cover sheet can be transmitted to the host structure more directly. It is recognized that the bypass effect of the edge elements can significantly improve the active action transmissibility of the ACL treatment, and the EACL could even achieve more control authority than a purely active configuration. On the other hand, the edge elements will slightly reduce the VEM passive damping effect. However, the EACL system will still have significant passive damping from the VEM. Combining the hybrid active and passive actions, the EACL with sufficiently stiff edge elements not only could outperform the ACL, but also could perform better than the purely active system. It is concluded that the system performance is very related to the stiffness of the edge elements. With careful analysis, we can map out the required critical stiffness for successful designs. In addition, analysis also shows that the EACL treatment is a more robust design. That is, it could outperform both the PCL and the purely active systems throughout a much broader design space than the ACL configuration. With these desirable characteristics, the EACL could be used to realize an overall optimal active-passive hybrid system.
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650 4 $a Mechanical engineering. $3 649730
650 4 $a Mechanics. $3 525881
653 $a piezoelectric
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690 $a 0346
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertations Abstracts International $g 59-02B.
790 $a 0176
791 $a Ph.D.
792 $a 1997
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9732313