AD-All# 9"3 AIR FORCE A ROSPACE MEDICAL RESE ARCH LAB WRI64fT-PATT--ETC F/S 1//USAF SICCrNVOR NWTAL NOISE DATA HANDBOOK. VOI.UME 1 8. T-379 1N--ETC(U)NOV 61 H K HILLS

UNCLASSIFIED AMML-TR-75-N-VOL-148

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REPORT DOCMENTATION PAGE 9F=CMLM ON.=OTMMA2 6OVV ACCZEN NO 3. RECIPIENT S C TALO@ N 1119111

ANRL-TR-75-50, Vol. 148 *YP OFRPOTAPEIDCOEE

14. TITLE (and Stitlo) FY ORERTaPIDCVRD

USAF BtOENVIRONMENTAL NOISE DATA HANDBOOK: Volume 148 of a seriesT-37B In-Flight Crew Noise _____________

41. PERFORMING ORG. REPORT NUMUERS

7. AUTHOR(s) 0. CONTRACT OR GRANT NUMUER(S)

Harald K. Hille

S. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT. TASKAir Force AREA & WORK UNI NUMUIERS

Aerospace Medical Research LaboratoryAerospace Medical Division, Air Force SystemsCommad. Wright-Pattpr~gn AFR_ Q fl49A112M 19310839

It. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATE

Same as above I. r;J 115

14. MONITORING AGENCY NAME 6 ADDRESS(if different from Controlling Office) IS. SECURITY CLASS. (of ti. report)

UnclassifiedIS. DECL ASSI FICATION/ DOWNGRADING

SCH EDULE

1S. DISTRIISUTION STATEMENT (of this Report)

Approved for public release; distribution unlimited

17. DISTRISUTION STA1'EMIENT (of the abstract entered In Block 20, it different from Report)

I0. SUPPLEMEN4TARY NOTES

It. KELY WORDS (Continue an tever*@ side It noe..wj mid identify by Wleek anibee)

NoiseNoise EnvironmentsBioenvironmental Noise

\In-flight Crew Noise*T-37B Aircraft

30. n AT(Conlinuean reverse aide It necessary ,d ideeoi~'Ir bOcek nfumb"r)

-'The T-37B is a USAF two-seat primary trainer aircraft. This reportprovides measured data defining the bioacoustic environments at flightcrew/passenger locations inside this aircraft during norml fli ghttoperations.Daa rerpote a neloato fr 9difeen lik koniios.npsychoacoustic measures: overall and band sound pressure levels, C-weightedand A-weighted sound levels, preferred speech interference level, perceivednoise level, and limiting times for total daily exposure of personnel with and

D O 1473 EDITION OF, I NOV 66is OSSOLETE

SECURITY CLASSIFICATION OF THIS PA,6E (Wham 3=796VINO

SECURITY CLASSIFICATION OF THiS PAGE(fWnbs Data Eaees

without standard Air Force ear protectors Refer to Volume 1 of this handbook"USAF Bloenvironmental Noise Data Handboo Vol 1: Organization, Content andApplication," ANRL-TR-75-50(1) 1975, for dis sston of the objective and desigiof the handbook, the types of data presented, Aasurement procedures,instrumentation, data processing, definitions o quantities, symbols,equations, applications, limitations, etc.

II

SECUI7Y CL.ASIICAliON OPt

THIS pASlnrllha, Dat Dfm

PREFACE

This report was prepared by the Biodynamic Environment Branch, Air Force AerospaceMedical Research Laboratory, under Project/Task 723108, Crew Safety In Operational NoiseEnvironments.

The author acknowledges the efforts of Mr. John N. Cole who established the data analysisrequirements, Mr. Henry Mohinan and Mr. Fred Lampley of the University of Dayton whomsisted in the mechanics of data processing and Mrs. Norma Peachey who typed this report

and prepared it for publication.

NTIS GRA&IDTIC TAB

Unannounced Q3just iticat io

0Avail, and/or 0oPEyE

Dist Special

TABLE OF CONTENTS

PopeINTRDUCION ......................................................................................... 3IN.FLIGHT NOISE........................................................................................ 4

LIST OF TABLES

1. Measurement Location and Test Conditions forNoise Measurements ................................................................................. 5

2. Measured Sound Pressure Level1/3 Octave Band...................................................................................... 6-7OctaveBand ......................................................................................... 81-3

3.Measures of Human Noise Exposure.................................................................. 1611

2

INTRODUCTION

The T-37B is a USAF two-seat primary trainer aircraft manufactured by the Cessna AircraftCompany, Wichita, Kansas. Power is provided by two Continental J-69-T-25 turbojet engineseach rated at 1025 lbs. maximum takeoff thrust. The engines are manufactured by TeledyneCAE, Toledo, Ohio.

This volume provides measured data defining the bioacoustic environments produced inside theaircraft. Such data are essential to evaluate ear protection requirements, limiting personnelexposure times, voice communication capabilities, and annoyance problems associated withoperations of the T-37B aircraft

This volume is one of a series published by the Aerospace Medical Research Laboratory (AMRL)under the same report number (AMRI-TR-75-50) as a multi-volume handbook that quantifiesthe noise environments produced at flight/ground crew locations and in surroundingcommunities by operations of Air Force aircraft and ground support equipment. The far-field,community-type, noise data in the handbook describe the noise produced during groundoperations of aircraft, ground support equipment, and other ground-based equipment orfacilities.

Volume 1 of this handbook discusses the objectives and design of the handbook, the types ofdata presented, measurement procedures, instrumentations, data processing, definitions ofquantities, symbols, equations, applications, limitations, etc. Refer to Volume 1 (reference 1)forsuch information because it is not repeated in other handbook volumes.

A cumulative index lists those aerospace systems contained in the handbook, and identifies thespecific volumes containing each type of environmental noise data available (i.e., in-flight/flight crew and passenger noise, near-field/ground crew noise, far-field/communitynoise). Volume numbers are assigned sequentially as individual volumes are published. Thisindex is periodically updated as individual volumes are published, and is available upon requestfrom AMRL/BBE, Wright-Patterson AFB, OH 45433. Organizations on the distribution list forthe handbook will automatically receive a copy of the updated index as it is generated.

Direct any questions concerning the technical data in this report and other handbook volumesto: AMRL/BBE, Wright-Patterson AFB, OH 45433; AUTOVON 78-3675 or 78-53664;Commercial (513) 256-3675 or (513) 255-3664.

1. Cole, John N., USAF Bioenvironmental Noise Data Handbook, Volume 1: Organization,Content and Application, AMRL.TR-76.50 (1), Aerospace Medical Research Laboratory,Wright-Patterson Air Force Base, Ohio, 197&

3

IN-FLIGHT NOISE

Mmsurements

All noise measurements were made on-board a T-37B aircraft during typical speed, altitude, andflight maneuver conditions. These levels describe the standard T-37B environments but maynot be represeatative of those levels encountered if the aircraft has been configured diffrently(e.g., major equipment or structural changes).

Acoustic measurements were made inside the cockpit at the pilot's location. Table 1 lists themeasurement location and test conditions as numeric/alphabetic designators which are usedon the data pages. The designator 1/A means measurement location 1 and test condition A, etc.

The microphone was attached to the pilot's helmet by means of a lightweight boom. Thisarrangement enabled adjustment of the microphone close to the ear level at a distance of 0.1meter with its diaphragm parallel and facing away from the helmet's surface. In the analysis,microphone corrections for random incidence were applied to the overall systems response. Therecorded samples were analyzed using a four or eight second integration time to obtain a power-averaged level which effectively smooths out short duration fluctuations and best describes theexposure.

Results

The measured data presented in Table 2 define the sound pressure levels (SPL) produced insidethe T-37B aircraft at the specified location. This table includes the overall, 1/3 octave band, andoctave band levels. From these data, C-weighted and A-weighted sound levels, maximumpermissible time for one exposure per day (AFR 161-35) with and without standard Air Force earprotectors, preferred speech interference level, and perceived noise level are calculated andpresented in Table & These measures are widely used to assess the effects of noise on personneland their performance.

4

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TABLE 1MEASUREMENT LOCATION AND TEST CONDITIONS

T-378, WRIGHT-PATTERSON AFS, OH; 6 AUG 81SER NO. 00141

Location Position Height Above Deck

1 Co-Pilot Seated Head Level

Condition Description

A Engines Idle, Canopy Closed ECS ON, 39% RPMB Engines Idle, Canopy Closed, ECS OFF, 39% RPMC Engines Idle, Canopy Open, 39% RPMD Engines Military, Canopy Closed, ECS ON, 80% RPME Engines Military, Canopy Closed, ECS OFF, 80% RPMF TaxiG TakeoffH Climb to 6,000 ftI Cruise 6,000 ft, 220 KIAS, 95% RPMJ Climb to 20,000 ft, 160 KIAS, 99% RPMK Cruise at 20,000 ft, 205 KIAS, 98% RPM, ECS ONL Cruise at 20,000 ft, 205 KIAS, 99% RPM, ECS OFFM Start of Descent to 10,000 ftN Descend to 10,000 ft, at 17,000 ft, speed brakes out0 Descend to 10,000 ft, at 13,000 ft, speed brakes upP Cruise at 10,000 ft, 190 KIAS, 85% RPM, ECS ONQ Cruise at 10,000 ft, 190 KiAS, 85% RPM, ECS OFFR Descend to 6,000 ftS Landing Roll

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