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Committee on SST-Sonic Boom Subcommittee on Physical Effects Report on Physical Effects of the Sonic Boom February 1968

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SUBCOMMITTEE ON PHYSICAL EFFECTS Dr. Everett F. Cox, Chairman Research Scientist Whirlpool Corporation St. Joseph, Michigan Dr. James K. Angell Chief, Atmospheric Trajectory Branch Environmental Science Services Branch U.S. Department of Commerce Silver Spring, Maryland Dr. Nathan M. Newmark Professor and Head Department of Civil Engineering University of Illinois Urbana, Illinois Mr. Jack W. Reed Sandia Corporation, 7111 Albuquerque, New Mexico Mr. John A. Robertson Director, Technical Services United States Gypsum Company Arlington, Virginia Staff Mr. Richard H. Tatlow I President Abbott, Merkt & Company, Inc. New York, New York Mr. J. Neils Thompson Director and Professor Balcones Research Center The University of Texas Austin, Texas Mr. Luke J. Vortman Sandia Corporation, 7111 Albuquerque, New Mexico Mr. Joseph H. Zettel Products Manager Johns-Manville Corporation Manville, New Jersey Vice Chairman Col. John P. Taylor, USA F (Ret.) Executive Secretary Committee on SST-Sonic Boom National Academy of Sciences Washington, D.C. Mr. Donald M. Weinroth Consultant Committee on SST-Sonic Boom National Academy of Sciences Washington, D.C.

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19 February 1968 Dr. John R. Dunning, Chairman Committee on SST-Sonic Boom National Academy of Sciences 2101 Constitution Avenue, N. W. Washington, D. C. 20418 Dear Dr. Dunning: At the 20 February 1967 meeting of the Committee, the Subcommittee on Physical Effects was requested to examine the current status of matters relating to "structural" response to sonic booms and to report what further research should be conducted. Transmitted herewith is the requested report; its transmittal has been delayed in order that the Subcommittee might review the final report on the physical effects aspects of the Edwards AFB program and preliminary data on alleged damage resulting from the Department of the Air Force operational-suitability testing of the SR-71. Overall, the Subcommittee is principally concerned about (1) the need for greater accuracy in the statistical description of the variations of boom signatures and physical responses; (2) the implications of the true sta- tistical descriptions of the "natural" variations of boom signatures from the presently accepted "computed" boom signatures; (3) the lack of attention being given to the notions of incipient and progressive damage of materials; and (4) the lack of progress being made in the development of simulator capability inasmuch as continued overflight test programs can result in data which, at best, only partially close the gap in knowledge. Accordingly, the Subcommittee recommends that the research outlined below (in descending order of priority) be undertaken promptly and pursued vigorously: 1. Design, construction, and operation of two types of simulators 2. Repetitive testing in simulators of a wide range of damage- susceptible materials and assemblies

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Dr. John R. Dunning Page Two 19 February 1 3. Static and dynamic testing of glass and glass systems 4. Acceleration and expansion of ESSA's sonic boom studies 5. Census, by sample survey, of window panes in selected cities 6. Evaluation of environmental parameters of material and building responses to natural phenomena 7. Theoretical study of critical earth structures 8. Interdisciplinary group study of legal-structural considerations 9. Study of means of accomplishing a national boom monitoring network. Sincerely, - C Everett F. Cox, Chairman Subcommittee on Physical Effects

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Subcommittee on Physical Effects Richard H. Tatlow Nathan M. Newmar Everett F. Cox, Chairman January 1968

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CONTENTS Section page I INTRODUCTION 1 Purpose and Scope 1 Conduct of Study 1 Organization of Report 1 II DISCUSSION 2 Program Basis 2 Simulators and Repetitive Testing 2 Glass Problems 6 Propagation Theory 8 Earth Structures 9 Noise Recorders 10 Legal Considerations 10 III CONCLUSIONS AND RECOMMENDATIONS 12 Conclusions 12 Recommendations 13