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Structure-Borne Noise Estimates for the PTA Aircraft

Structure-Borne Noise Estimates for the PTA Aircraft
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 62
Release: 2018-07-16
Genre:
ISBN: 9781722779801

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Estimates of the level of in-flight structure-borne noise transmission in the Propfan Test Assessment Aircraft were carried out for the first three blade passage frequencies. The procedure used combined the frequency response functions of wing strain to cabin sound pressure level (SPL) response obtained during ground test with in-flight measured wing strain response data. The estimated cabin average in-flight structure-borne noise levels varied from 64 to 84 dB, with an average level of 74 dB. The estimates showed little dependence on engine/propeller power, flight altitude, or flight Mach number. In general, the bare cabin noise levels decreased with increasing propeller tone, giving rise to a plausible structure-borne noise transmission problem at the higher blade passage tones. Without knowledge of the effects of a high insertion loss side wall treatment on structure-borne noise transmission, no quantitative conclusions could be made. Unruh, James F. Unspecified Center...


90-3936 to 90-3971

90-3936 to 90-3971
Author:
Publisher:
Total Pages: 440
Release: 1990
Genre: Airplane sounds
ISBN:

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The Challenge of Crime in a Free Society

The Challenge of Crime in a Free Society
Author: United States. President's Commission on Law Enforcement and Administration of Justice
Publisher:
Total Pages: 368
Release: 1967
Genre: Crime
ISBN:

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This report of the President's Commission on Law Enforcement and Administration of Justice -- established by President Lyndon Johnson on July 23, 1965 -- addresses the causes of crime and delinquency and recommends how to prevent crime and delinquency and improve law enforcement and the administration of criminal justice. In developing its findings and recommendations, the Commission held three national conferences, conducted five national surveys, held hundreds of meetings, and interviewed tens of thousands of individuals. Separate chapters of this report discuss crime in America, juvenile delinquency, the police, the courts, corrections, organized crime, narcotics and drug abuse, drunkenness offenses, gun control, science and technology, and research as an instrument for reform. Significant data were generated by the Commission's National Survey of Criminal Victims, the first of its kind conducted on such a scope. The survey found that not only do Americans experience far more crime than they report to the police, but they talk about crime and the reports of crime engender such fear among citizens that the basic quality of life of many Americans has eroded. The core conclusion of the Commission, however, is that a significant reduction in crime can be achieved if the Commission's recommendations (some 200) are implemented. The recommendations call for a cooperative attack on crime by the Federal Government, the States, the counties, the cities, civic organizations, religious institutions, business groups, and individual citizens. They propose basic changes in the operations of police, schools, prosecutors, employment agencies, defenders, social workers, prisons, housing authorities, and probation and parole officers.


Noise Music

Noise Music
Author: Paul Hegarty
Publisher: Continuum
Total Pages: 240
Release: 2007-09-01
Genre: Music
ISBN: 9780826417275

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Noise/Music looks at the phenomenon of noise in music, from experimental music of the early 20th century to the Japanese noise music and glitch electronica of today. It situates different musics in their cultural and historical context, and analyses them in terms of cultural aesthetics. Paul Hegarty argues that noise is a judgement about sound, that what was noise can become acceptable as music, and that in many ways the idea of noise is similar to the idea of the avant-garde. While it provides an excellent historical overview, the book's main concern is in the noise music that has emerged since the mid 1970s, whether through industrial music, punk, free jazz, or the purer noise of someone like Merzbow. The book progresses seamlessly from discussions of John Cage, Erik Satie, and Pauline Oliveros through to bands like Throbbing Gristle and the Boredoms. Sharp and erudite, and underpinned throughout by the ideas of thinkers like Adorno and Deleuze, Noise/Music is the perfect primer for anyone interested in the louder side of experimental music.


Critical Thinking

Critical Thinking
Author: Gregory Bassham
Publisher:
Total Pages: 497
Release: 2008
Genre: Critical thinking
ISBN: 9780071101547

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Through the use of humour, fun exercises, and a plethora of innovative and interesting selections from writers such as Dave Barry, Al Franken, J.R.R. Tolkien, as well as from the film 'The Matrix', this text hones students' critical thinking skills.