Title

Criteria For Comparing The Effectiveness Of Damping Treatments

Date

1961

Index Abstract

Contrails and DTIC condensed/truncated

Photo Quality

Not Needed

Report Number

WADD TR 61-25

Corporate Author

University Of Southampton

Laboratory

Materials Central

Extent

46

Identifier

AD0408982

AD0408982

Access Rights

OTS

Distribution Classification

1

Contract

AF 61(052)-332

DoD Project

7351 - Metallic Materials

DoD Task

73521

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Abstract

In this report, expressions are derived for the response of simple vibrating systems, from which criteria have been deducted to indicate the effectiveness of a damping treatment in attenuating the response. The criteria include factors by which the treatment increases the mass and stiffness of the system, together with the loss factor increment. The response quantities considered include bending stresses, accelerations, inertis forces and sound transmission associated with simple vibrating plates under harmonic and random excitation. Coincidence sound transmission is also briefly considered. It is shown that whereas the mass and loss factor increase is always advantageous, a stiffness increase in some instance is detrimental.

As an example, three different commercial treatments are compared on the basis of some of the criteria. With low treatment weights, the treatment providing the highest loss factor is superior judged by each criterion, but at higher weights according to some criteria a treatment having a lower stiffness, density and loss factor is more effective. The existence of optimum treatment weights for maxiumum effect upon the response is also shown by some criteria.

Report Availability

Full text available

Date Issued

1961-01

Subject

Vibration

Damping

Sound Transmission

Publisher

Wright-Patterson Air Force Base, OH : Wright Air Development Division, Air Research and Development Command, United States Air Force

Distribution Conflict

No

Provenance

IIT

Type

report

Format

1 online resource

Creator

Mead, D. J.