Title

Survey and Evaluation of Sonic Fatigue Testing Facilities

Description

A survey and evaluation of the sonic fatigue testing facilities throughout the country has been made to establish present methods and techniques of testing and to determine the necessity of performing other environmental tests in combination with high intensity noise.Fifteen facilities were visited and detailed descriptions of these facilities are presented. The facilities are considered in terms of their functions as design, proof testing, and research tools, and such things as sound sources, the theoretical background of sonic fatigue work, test methods and specimen arrangements, instrumentation and data acquisition, time and costs, and combined environments are discussed and evaluated. In addition, what are considered the most feasible design and proof testing procedures, within the framework of present theory and equipment, are presented. A few of the general conclusions are that:1. The most economical procedure for developing sonic fatigue resistant structures consists of the general steps:(a) Design panels with discrete frequency siren methods(b) Perform semi-qualification tests with broad band sources such as broad band sirens or modulated air flaw speakers (not jet engines).(c) Perform a full scale proof test.
2. The effects of temperature and pressure (and perhaps corrosion) can only be assessed by combined tests.3 Combined tests for nuclear radiation should not be considered in the foreseeable future.4. In many instances the effects of correlation can be approximated in a discrete frequency siren test by orienting a specimen in a manner determined by consideration of the sound level contours existing on the aircraft.

Index Abstract

Contrails and DTIC

Photo Quality

Not Needed

Report Number

ASD TR 61-185

Index Price

$0.00

Report Availability

Full text available by request

Creator

Bianchi, Ralph A.

Bradshaw, Ronald T.

Farrell, James H.

Reed, F. Everett

Date

1962

Extent

364

Corporate Author

CONESCO Consultants in Engineering Science

Laboratory

Flight Dynamics Laboratory

Identifier

AD0277124

AD0277124

Contract

AF 33(616)-7003

DoD Project

1370

DoD Task

13963

Distribution Conflict

No

Access Rights

OTS

Distribution Classification

1

Date Issued

1962-03

Abstract

A survey and evaluation of the sonic fatigue testing facilities throughout the country has been made to establish present methods and techniques of testing and to determine the necessity of performing other environmental tests in combination with high intensity noise.Fifteen facilities were visited and detailed descriptions of these facilities are presented. The facilities are considered in terms of their functions as design, proof testing, and research tools, and such things as sound sources, the theoretical background of sonic fatigue work, test methods and specimen arrangements, instrumentation and data acquisition, time and costs, and combined environments are discussed and evaluated. In addition, what are considered the most feasible design and proof testing procedures, within the framework of present theory and equipment, are presented. A few of the general conclusions are that: 1. The most economical procedure for developing sonic fatigue resistant structures consists of the general steps: (a) Design panels with discrete frequency siren methods (b) Perform semi-qualification tests with broad band sources such as broad band sirens or modulated air flaw speakers (not jet engines). (c) Perform a full scale proof test.
2. The effects of temperature and pressure (and perhaps corrosion) can only be assessed by combined tests.3 Combined tests for nuclear radiation should not be considered in the foreseeable future.4. In many instances the effects of correlation can be approximated in a discrete frequency siren test by orienting a specimen in a manner determined by consideration of the sound level contours existing on the aircraft.

Provenance

Bombardier/Aero

Type

report

Subject

Jet Engines

Acoustics

Sonic Fatigue

Aircraft

Defects (Materials)

Environmental Tests

High Intensity

Test Facilities

Fatigue Tests (Mechanics)

Noise (Sound)

Publisher

Wright-Patterson Air Force Base, OH : Flight Dynamics Laboratory, Aeronautical Systems Division, Air Force Systems Command

Format

xiv, 364 pages : ill. ; 28 cm.

AD Number

AD277124

DTIC Record Exists

Yes