Criteria and Summary of Performance of Portable Ground Runup Suppressors for Jet Aircraft
by Jose C. Ortega and John W. Little
Bok Engelsk 1963
| Utgitt | Wright-Patterson Air Force Base, Ohio : Directorate of Aerospace Ground Equipment Engineering Research and Technology Division Air Force Systems Com. , 1963
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| Omfang | 124 s. : ill.
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| Opplysninger | Project No. 8131, Task No. 813106 (Prepared under Contract No. AD 33(657)-10067 by Western Electro-Acoustic Laboratory, Inc., Los Angeles, California). - TABLE OF CONTENTS: 1.0 INTRODUCTION 2.0 DEVELOPMENT OF ACOUSTICAL CRITERIA AND PERFORMANCE SPECIFICATIONS FOR NOISE SUPPRESSORS FOR GROUND MAINTENANCE RUNUP OF TURBOJET ENGINES AND TURBOJET-POWERED AIRCRAFT 2.1 Introduction 2.1.1 Type of Performace Rating 2.1.2 Applicability of Ratings 2.1.3 Classes of Acoustical Performance for Suppressors 2.1.4 Measurement of Performance Relative to Procurement Specification 2.2.1 Air Force Operations Information 2.2.2 Types of Performance Rating 2.2.3 Applicability of Ratings and Criteria 2.2.4 Classes of Acoustical Performance 2.2.5 Special Considerations 2.3 Concluding Remarks 3.0 ASSESSMENT OF CURRENT TECHNOLOGY OF PORTABLE NOISE SUPPRESSOR DESIGN AND DETERMINATION OF REQUIRED RESEARCH AND DEVELOPMENT AREAS 3.1 Introduction 3.2 Development of a State of the Art Portable Ground Runup Suppressor 3.2.1 Description of a Portable Ground Runup Suppressor 3.2.2 Acoustical Effectiveness of Noise Suppressor Components 3.2.3 Portable Ground Runup Engine Compressor Noise Suppressor 3.2.4 State of the Art Portable Ground Runup Suppressor 3.3 Evaluation of Current Portable Noise Suppressor 3.4 Areas for Future Research and Development 4.0 DEVELOPMENT OF ACOUSTICAL PERFORMANCE MEASUREMENT PROCEDURES AND SPECIFICATIONS FOR USE IN THE EVALUATION OF GROUND RUNUP NOISE SUPPRESSORS 4.1 Introduction 4.2 Measurement Procedures 4.2.1 Meteorological Conditions 4.2.2 Effects of Terrain on Sound Propagation 4.2.3 Microphone Measurement Locations in the Evaluation of a Ground Runup Suppressor 4.2.4 Data Averaging Methods 4.3 Instrumentation 4.3.1 Microphones 4.3.2 Octave Band Filters 4.3.3 Meters 4.3.4 Tape Recorders 4.3.5 Microphonics 4.4 Proposed Noise Suppressor Evaluation Specification and Procedure 4.4.1 General 4.4.2 Microphone Measurement Locations 4.4.3 Meteorological Conditions 4.4.4 Terrain Features 4.4.5 Engine Operating Conditions 4.4.6 Background Noise 4.4.7 Time of Day 4.4.8 Instumentation 4.49 Supplementary Data 4.4.10 Data Reduction Methods LIST OF REFERENCES ILLUSTRATIONS APPENDIX I Air Base Noise Exposure Survey Table I Ground Crew Noise Exposure Table II Relative Noise Output of USAF Operational Aircraft APPENDIX II Tabular Summary of Air Base Noise Exposure Survey Table III Noise Exposure Survey Results for Section I (Tactical) Air Force Bases Noise Exposure Survey Results for Section II (Strategic) Air Force Bases Table IV Real-Ear Attenuation at Threshold of Standard Air Fore Ear Protectors Table V Classification of Suppressors
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| Emner | |
| Dewey |
