Torsional Vibration Absorbers: A Testing and Evaluation Apparatus

2001 ◽  
Author(s):  
Alan G. Haddow ◽  
Steven W. Shaw
Keyword(s):  
Torsional Vibration ◽  
Vibration Absorbers ◽  
Testing And Evaluation

An Experimental Study of Torsional Vibration Absorbers

2001 ◽  
Author(s):  
Alan G. Haddow ◽  
Steven W. Shaw
Keyword(s):  
Experimental Study ◽  
Dynamic Behavior ◽  
Systematic Study ◽  
Torsional Vibration ◽  
Theoretical Background ◽  
Controlled Environment ◽  
Vibration Absorbers ◽  
Test Apparatus ◽  
First Time ◽  
Theoretical Results

Abstract This paper presents results from tests completed on a rotor system fitted with pendulum-type torsional vibration absorbers. A review of the associated theoretical background is also given and the experimental and theoretical results are compared and contrasted. An overview of the test apparatus is provided and its unique features are discussed. To the best knowledge of the authors, this is the first time that a systematic study of the dynamic behavior of torsional vibration absorbers has been undertaken in a controlled environment.

Torsional Vibration Suppression by a Centrifugal Pendulum Vibration Absorber

2005 ◽  
Author(s):  
Yukio Ishida ◽  
Tsuyoshi Inoue ◽  
Taishi Kagawa ◽  
Motohiko Ueda
Keyword(s):  
Torsional Vibration ◽  
Large Amplitude ◽  
Vibration Suppression ◽  
Torsional Vibrations ◽  
Vibration Absorbers ◽  
Harmonic Vibrations ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Automobile Engines ◽  
Large Amplitude Vibration ◽  
Driving Torque

Driving torque of rotating machinery, such as automobile engines, changes periodically. As a result, torsional vibrations occur and cause serious noise and vibration problems. In this study, the dynamic characteristics of centrifugal pendulum vibration absorbers restraining torsional vibration is investigated both theoretically and experimentally. In the theoretical analysis, the nonlinear characteristics are taken into consideration under the assumption of large amplitude vibration of pendulum. It is clarified that the centrifugal pendulum, although it has remarkable effects on suppressing harmonic vibration, induces large amplitude harmonic vibrations, the second and third superharmonic resonances, and unstable vibrations of harmonic type. We propose various methods to suppress these secondarily induced vibration and show that it is possible to suppress torsional vibrations to substancially zero amplitude in all through the rotational speed range.

Some Early Experiences of Mechanical Vibration in Marine Engine Systems

1970 ◽  
Vol 185 (1) ◽  
pp. 1023-1089 ◽  
Author(s):  
W. Ker Wilson
Keyword(s):  
Torsional Vibration ◽  
Mechanical Vibration ◽  
Viscous Friction ◽  
Vibration Absorbers ◽  
Connecting Rod ◽  
Helical Springs ◽  
Reciprocating Engine ◽  
Twin Screw ◽  
Mass Balancing ◽  
Vibration Tests

Everything which is struck rings; everything has a particular ring.—Pythagoras of Samos (582-507 B.C.) The lecture is divided into the following sections. Introduction. Early days. Camshaft drives. Camshaft drive at free end and after end of crankshaft; later developments. Mass balancing of internal-combusion engines. Single-piston assemblies; unbalanced centrifugal and inertia forces. Mass balancing opposed-piston engines. Ship vibration; scavenge-crank balance weights; scavenge-pump reciprocating parts; crankshaft-coupling-bolt failures; change of firing order; results and conclusions from vibration tests. Differential-stroke (mass-balanced) opposed-piston engines; first fully balanced opposed-piston engines; lever-driven scavenge pumps. Transverse (rolling) vibration of engine frame. Experimental determination of the natural frequency of transverse (rolling) vibration of opposed-piston engines; transverse vibration of engine frame in twin-screw ships and its control. Torsional vibration. Investigation of side-connecting-rod failures; investigation of torsional vibration; retiming the crankshaft system; general; marine steam reciprocating engine. Devices for controlling torsional vibration. Tuned and damped vibration absorbers; dynamic vibration absorbers in opposed-piston-engine propulsion systems; Bibby peripheral grid springs; vibration absorbers at free ends of crankshafts; experimental absorber with peripheral helical springs; Doxford-Bibby absorber. Later history. Large six-cylinder opposed-piston engines; alternative viscous-friction dampers; modified vibration absorber; stiffer crankshafts; P-type engines; J-type engines.

Nonlinear Aspects of the Performance of Centrifugal Pendulum Vibration Absorbers

1964 ◽  
Vol 86 (3) ◽  
pp. 257-263 ◽  
Author(s):  
D. E. Newland
Keyword(s):  
Torsional Vibration ◽  
Large Amplitude ◽  
Vibration Absorbers ◽  
Aircraft Engines ◽  
Reciprocating Engines ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Large Amplitude Motion

Centrifugal pendulums have been used for many years to limit the torsional vibration of reciprocating engines. Recently small pendulums, designed to swing through amplitudes of about 45 deg, have been tested for lightweight aircraft engines. These have not functioned properly, and have been found to swing through much larger angles than expected, damaging the stops limiting motion of the pendulum counterweight. This paper investigates the large-amplitude motion of centrifugal-pendulum vibration absorbers.

scholarly journals Developments in the Design of Centrifugal Pendulum Vibration Absorbers

2020 ◽  
Vol 25 (2) ◽  
pp. 266-277
Author(s):  
David E. Newland
Keyword(s):  
Torsional Vibration ◽  
System Performance ◽  
Vibration Absorbers ◽  
Aircraft Engines ◽  
Current State ◽  
Practical Design ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Automobile Engines ◽  
The Subject ◽  
Design Requirements

For over 60 years, the torsional vibration of reciprocating aircraft engines has been controlled by centrifugal pendulum vibration absorbers. Loose weights attached to an engine's crankshaft act as tuned-mass absorbers by oscillating at a frequency in proportion to rotational speed. More recently, similar loose masses have been attached to the flywheels of automobile engines. The need to achieve increased power from fewer cylinders, while reducing weight and improving economy, has exacerbated torsional vibration of the drive train. The dynamics of a wheel carrying many centrifugal pendulums of bifilar design has been the subject of a growing literature, but much less has been written about roller-type pendulums and about overall system performance. This paper is a new analysis of bifilar and roller systems and their design requirements. The current state of knowledge about practical design limitations is explained and the need for further research discussed.

Torsional Vibration Suppression by Roller Type Centrifugal Vibration Absorbers

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Yukio Ishida ◽  
Tsuyoshi Inoue ◽  
Tomohiko Fukami ◽  
Motohiko Ueda
Keyword(s):  
Torsional Vibration ◽  
Vibration Suppression ◽  
Vibration Absorbers ◽  
Nonlinear Dynamical ◽  
Dynamical Characteristics ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Automobile Engines ◽  
Long Time ◽  
The Difference

Centrifugal pendulum vibration absorbers (CPVA) have been used for a long time as a method to suppress torsional vibration. Recently, roller type CPVA, that has a similar characteristic but simpler structure, have been investigated and started to be used in some automobile engines. However, only the linear dynamical characteristics of the roller type CPVA have been focused, and the influence of the nonlinearity affecting on vibration suppression has not been clarified. This study mainly focuses on the explanation of nonlinear dynamical characteristics of roller type CPVA. Especially, it clarifies the importance of consideration of nonlinearity in the design of the roller type CPVA, both theoretically and experimentally. Furthermore, the difference between the pendulum type CPVA and roller type CPVA are discussed from the viewpoint of the effect of vibration suppression.

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