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Gravity's effect on centrifugal pendulum vibration absorbers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Gravity's effect on centrifugal pendulum vibration absorbers./
Author:	Theisen, Thomas Michael.
Description:	116 p.
Notes:	Source: Masters Abstracts International, Volume: 50-03, page: 1964.
Contained By:	Masters Abstracts International50-03.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1503534
ISBN:	9781267092830

Gravity's effect on centrifugal pendulum vibration absorbers.
Theisen, Thomas Michael.

Gravity's effect on centrifugal pendulum vibration absorbers. - 116 p.

Source: Masters Abstracts International, Volume: 50-03, page: 1964.

Thesis (M.S.)--Michigan State University, 2011.

This work describes an analytical investigation of the effects of gravity on the dynamics and performance of centrifugal pendulum vibration absorbers (CPVAs). CPVAs are passive devices, consisting of movable masses suspended on a rotor, which act to reduce torsional vibrations in internal combustion engines and other rotating systems. When the system axis of rotation is not vertical, gravity acts directly on the absorbers, and can affect system behavior at low rotor speeds. The investigation is based on a mathematical model that is studied using perturbation methods and numerical simulations. The effects of gravity are captured by a parameter gamma, and are examined for different absorber designs and operating conditions, paying particular attention to cases relevant to internal combustion engines. It is found that the steady state system response can be divided into two cases, depending on the order n of the applied torque that leads to torsional vibrations. In the general case, n ≠ 1; 2, the absorber response to gravity and the applied torque are essentially uncoupled, and the system response can be systematically explored by the introduction of an equivalent system order tuning parameter. In the special cases, n = 1; 2, nonlinear interactions from gravity can alter the order n system response in a nontrivial manner. Specifically, we consider the n = 2 case, in which a superharmonic response of the absorbers can occur, and the features of this response depend on the number of absorbers N and other system parameters. These predictive results will be of use in the design of CPVAs for automotive engines currently being developed for low speed idle conditions.

ISBN: 9781267092830Subjects--Topical Terms:

845387
Engineering, Mechanical.

Gravity's effect on centrifugal pendulum vibration absorbers.
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035 $a (UMI)AAI1503534
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100 1 $a Theisen, Thomas Michael. $3 845688
245 1 0 $a Gravity's effect on centrifugal pendulum vibration absorbers.
300 $a 116 p.
500 $a Source: Masters Abstracts International, Volume: 50-03, page: 1964.
500 $a Advisers: Steven W. Shaw; Brian F. Feeny.
502 $a Thesis (M.S.)--Michigan State University, 2011.
520 $a This work describes an analytical investigation of the effects of gravity on the dynamics and performance of centrifugal pendulum vibration absorbers (CPVAs). CPVAs are passive devices, consisting of movable masses suspended on a rotor, which act to reduce torsional vibrations in internal combustion engines and other rotating systems. When the system axis of rotation is not vertical, gravity acts directly on the absorbers, and can affect system behavior at low rotor speeds. The investigation is based on a mathematical model that is studied using perturbation methods and numerical simulations. The effects of gravity are captured by a parameter gamma, and are examined for different absorber designs and operating conditions, paying particular attention to cases relevant to internal combustion engines. It is found that the steady state system response can be divided into two cases, depending on the order n of the applied torque that leads to torsional vibrations. In the general case, n ≠ 1; 2, the absorber response to gravity and the applied torque are essentially uncoupled, and the system response can be systematically explored by the introduction of an equivalent system order tuning parameter. In the special cases, n = 1; 2, nonlinear interactions from gravity can alter the order n system response in a nontrivial manner. Specifically, we consider the n = 2 case, in which a superharmonic response of the absorbers can occur, and the features of this response depend on the number of absorbers N and other system parameters. These predictive results will be of use in the design of CPVAs for automotive engines currently being developed for low speed idle conditions.
590 $a School code: 0128.
650 4 $a Engineering, Mechanical. $3 845387
690 $a 0548
710 2 $a Michigan State University. $b Mechanical Engineering. $3 845689
773 0 $t Masters Abstracts International $g 50-03.
790 1 0 $a Shaw, Steven W., $e advisor
790 1 0 $a Feeny, Brian F., $e advisor
790 1 0 $a Radcliffe, Clark J. $e committee member
790 $a 0128
791 $a M.S.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1503534