Title

New Approaches to Flight Vehicle Structural Vibration Analysis and Control

Date

1962

Index Abstract

Not Available

Photo Quality

Undetermined

Report Number

ASD TDR 62-237

Creator

Heck, Manfred A.

Lyon, Richard H.

Maidanik, Gideon

Ungar, Eric E.

Corporate Author

Bolt, Beranek & Newman, Inc.

Laboratory

Flight Dynamics Laboratory

Extent

87

Identifier

AD0290798

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(615)-7973

DoD Project

1370

DoD Task

137009

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Distribution Conflict

No

Abstract

New methods are outlined for dealing with the vibration responses of complex flight vehicle structures to local and to diffuse acoustic excitation. Energy absorption at structural joints and acoustic radiation resistance are shown to be important in establishing levels of these responses. Some experimental results pertaining to energy absorption coefficients and radiation resistance are given, and procedures for estimating the latter are discussed. Feasibility studies of vibration absorbers utilizing viscoelastic spring elements and distributed mass systems and of vibration isolators compose6of viscoelastic leaf springs are summarized. Only the latter are found to possess some practical advantages over conventional systems. The results of experiments are presented which demonstrate that sound-tostructure coupling may be reduced significantly by the use of beams of special design whose stiffness decreases with increasing frequency. An analytical investigation is summarized which shows that generally damping of only the plates summarized which shows that generally damping of only the plates of beam-plate systems may be more desirable than damping of only the beams.

Report Availability

Not available via Contrails

Date Issued

1962-10

Index In

DTIC

Type

report