Author: Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 628
Book Description
NASA Reference Publication
Author: Aeroacoustics of Flight Vehicles
Author: Harvey H. HubbardPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 616
Book Description
Mechanics of Flow-Induced Sound and Vibration, Volume 2
Author: William K. BlakePublisher: Academic Press
ISBN: 0128122900
Category : Science
Languages : en
Pages : 696
Book Description
Mechanics of Flow-Induced Sound and Vibration, Volume 2: Complex Flow-Structure Interactions, Second Edition, enables readers to fully understand flow-induced vibration and sound, unifying the disciplines of fluid dynamics, structural dynamics, vibration, acoustics, and statistics in order to classify and examine each of the leading sources of vibration and sound induced by various types of fluid motion. Starting from classical theories of aeroacoustics and hydroacoustics, a formalism of integral solutions valid for sources near boundaries is developed and then broadened to address different source types, including hydrodynamically induced cavitation and bubble noise, turbulent wall-pressure fluctuations, pipe and duct systems, lifting surface flow noise and vibration, and noise from rotating machinery. Each chapter is illustrated with comparisons of leading formulas and measured data. Combined with its companion book, Mechanics of Flow-Induced Sound and Vibration, Volume 1: General Concepts and Elementary Sources, the book covers everything an engineer needs to understand flow-induced sound and vibration. This book will be a vital source of information for postgraduate students, engineers and researchers with an interest in aerospace, ships and submarines, offshore structures, construction, and ventilation. - Presents every important topic in flow-induced sound and vibration - Covers all aspects of the topics addressed, from fundamental theory, to the analytical formulas used in practice - Provides the building blocks of computer modeling for flow-induced sound and vibration
NASA Technical Memorandum
Author: Aeroacoustics of Flight Vehicles: Noise sources
Author: Harvey H. HubbardPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 612
Book Description
Mechanics of Flow-Induced Sound and Vibration V2
Author: William K. BlakePublisher: Elsevier
ISBN: 0323145752
Category : Science
Languages : en
Pages : 569
Book Description
Mechanics of Flow-Induced Sound and Vibration V2
Aeroacoustics of Flight Vehicles: Theory and Practice. Volume 1: Noise Sources
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 616
Book Description
The field of aeroacoustics has matured dramatically in the past two decades. Researchers have gained significant theoretical and experimental understanding of the noise generated by aircraft power plants and their components. In addition, airframe noise and interior noise have been investigated extensively. The physical understanding obtained from these efforts has resulted in the development of hardware capable of reducing community noise and of meeting strict noise certification requirements. Reductions in overall sound pressure level of 20 to 30 dB have been obtained for some types of power plants, while in the same period their installed power has increased significantly. Current quiet flight vehicle designs are based on information reported in a multitude of journals, conference proceeding, research reports, and specialized books. Each of these scientific publications represents only incremental steps in the evolution of our present understanding of the various aeroacoustic noise generation and propagation mechanisms and procedures for noise control.
Scientific and Technical Aerospace Reports
Author: STAR
Author: A Method for Calculating Strut and Splitter Plate Noise in Exit Ducts
Author: Martin R. FinkPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 88
Book Description
Portions of a four-year analytical and experimental investigation relative to noise radiation from engine internal components in turbulent flow are summarized. Spectra measured for such airfoils over a range of chord, thickness ratio, flow velocity, and turbulence level were compared with predictions made by an available rigorous thin-airfoil analytical method. This analysis included the effects of flow compressibility and source noncompactness. Generally good agreement was obtained. This noise calculation method for isolated airfoils in turbulent flow was combined with a method for calculating transmission of sound through a subsonic exit duct and with an empirical far-field directivity shape. These three elements were checked separately and were individually shown to give close agreement with data. This combination provides a method for predicting engine internally generated aft-radiated noise from radial struts and stators, and annular splitter rings. Calculated sound power spectra, directivity, and acoustic pressure spectra were compared with the best available data. These data were for noise caused by a fan exit duct annular splitter ring, larger-chord stator blades, and turbine exit struts.