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Saturday, July 11, 2020 | History

3 edition of Acoustic environment accuracy requirements for response determination found in the catalog.

Acoustic environment accuracy requirements for response determination

Mark R Pettitt

Acoustic environment accuracy requirements for response determination

a final report of work performed under contract no. NAS8-33379

by Mark R Pettitt

  • 234 Want to read
  • 39 Currently reading

Published by The Center in [Huntsville, Ala.?] .
Written in English

    Subjects:
  • Space vehicles -- Mathematical models,
  • Turbulent boundary layer,
  • Acoustical engineering

  • Edition Notes

    Statementby Mark R. Pettitt ; for National Aeronautics and Space Administration, George C. Marshall Space Flight Center
    SeriesNASA-CR -- 171003, Wyle laboratories-research staff research report -- WR 83-43, NASA contractor report -- 171003, Research report (Wyle Laboratories) -- WR 83-43
    ContributionsGeorge C. Marshall Space Flight Center, Wyle Laboratories. Scientific Services & Systems Group
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14927842M

    ISO describes how sound pressure levels can be determined by direct measurement, by extrapolation of measurement results by means of calculation, or exclusively by calculation, intended as a basis for assessing environmental noise. Recommendations are given regarding preferable conditions for measurement or calculation to be applied Category: w. Using the acoustic intensity method between the pressure and the intensity that is indicated when the probe is located in a totally diffuse sound field). But also the actual measurement conditions, i.e. acoustic environment, reverberation time, extraneous sound sources influence the useful frequency range of the measuring by: 5.

    the algorithm leads to a more accurate localization of acoustic emission events and offers totally new perspectives for acoustic emission imaging and for acoustic tomography in general. 1. Introduction and Outline Localization algorithms in acoustic emission (AE) testing mostly use the assumption of a. Acoustic positioning systems can yield an accuracy of a few centimeters to tens of meters and can be used over operating distance from tens of meters to tens of kilometers. Performance depends strongly on the type and model of the positioning system, its configuration for a particular job, and the characteristics of the underwater acoustic environment at the work site.

    In two studies the impact of overall IEQ on comfort was modelled, based on the effects of single environmental conditions on comfort,.This was done to learn about physical conditions of the thermal and acoustic environments and air quality which lead to the same levels of overall satisfaction with IEQ and to estimate how much a change of each condition affects overall by: Vibro-acoustic virtual prototypes were used to predict the acoustic response of a PLF cavity when excited by an ADF of dB OSPL ranging from 5 to 8, Hz, generated at lift off. Coupled deterministic techniques, using FEM/FEM and FEM/BEM, were applied to the fairing problem in a low-frequency band, considering accurate and efficient Cited by: 1.


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Acoustic environment accuracy requirements for response determination by Mark R Pettitt Download PDF EPUB FB2

A general purpose computer program was developed for the prediction of vehicle interior noise. This program, named VIN, has both modal and statistical energy analysis capabilities for structural/acoustic interaction : M. Pettitt. Acoustic environment accuracy requirements for response determination: a final report of work performed under contract no.

NAS 2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. ASTM Standards. E Practice for Characterizing Acoustic Emission Instrumentation.

E Practice for Verifying the Consistency of AE-Sensor Response Using an Acrylic Rod. E Guide for Acoustic Emission System Performance.

Defining the Acoustic Requirements for a Building and Community Cities throughout the United States have building codes that typically include acoustical requirements. These code mandates are specified in terms of ASTM standards.

The most common standards used in building codes are Sound Transmission Class (STC) and Impact Insulation Class (IIC). Report: Good acoustic environment more than just freedom from noise Contents PREFACE 3 CONTENTS 5 1.

BASIC PRINCIPLES IN ACOUSTIC QUALITY 7 The acoustic environment affects our 7 experience 7 Silence – not always a good acoustic 8 environment 8 The significance of nature and the cultural 8 environment 8 Different claims and expectations 9 Size: KB.

Acoustics in Healthcare Environments 5 WHY ACOUSTICS MATTER IN HEALTHCARE ENVIRONMENTS Creating a comfortable acoustic environment in healthcare environments can play an important role in supporting safety, health, healing, and well-being for all occupants.

Additionally, maintaining speech privacy. Because environmental acoustics has a complex mathematical basis,it is often difficult to determine whether acousticalrecommendations are valid.

Handbook of Environmental Acousticssimplifies this decision-making process and provides easy-to-followexplanations of acoustic terminology, noise control design, andregulatory noise issues.

The book clarifies key aspects ofenvironmental noise in basic. Attitude Determination and Control Systems Scott R. Starin, NASA Goddard Space Flight Center John Eterno, Southwest Research Institute In the yearGalveston, Texas, was a bustling community of approximat people.

The former capital of the Republic of Texas remained a trade center for the state and was one of the largest.

Chapter 1 — Introduction. Product Support. Microphone Handbook Vol.1 BE 11–12 1− All such measures play an important part in achieving the renowned reliability and accuracy of Brüel&Kjær microphones. This reliability is based on the known per- formance parameters of the microphone.

The acoustic environment of a place or space is the sound from all the sources that could be heard by someone in that place [21]. Thus, the acoustic environment depends on the sources present and their spatial distribution, the location of the receiver and the propagation conditions along the paths.

Quality of the acoustic environment 6A. Present Situation Describe the present situation in relation to the quality of the acoustic environment, including any relevant disadvantages or constraints resulting from historical, geographical and/or socio-economic factors which File Size: 1MB.

HEARING LOSS DUE TO RECREATIONAL SOUND: REVIEW R. Neitzel, B. Fligor, WHO Make Listening Safe, WHO This document presents a review of existing evidence on risk of hearing loss due to exposure to loud sounds in recreational settings. The evidence will be used to stimulate discussion for determination of exposure limits to.

Development of effective diagnostic systems requires using high quality recordings, because of its influence on the accuracy of acoustic voice analysis [7].

Quality of records depends on. C Analytical accuracy. General laboratory documentation requirements discussed in this document are formatted into two sections, organic and inorganic analyses.

These specifications are intended to establish general, analytical documentation requirements that contract and subcontract laboratories should meet when generating data for USEPA File Size: KB. Standards for Internal Control in the Federal Government (known as the Green Book), provide the overall framework for establishing and maintaining an effective internal control system.

Office of Management and Budget (OMB) Circular No. A provides specific requirements for assessing and reporting on controls in the federal Size: 2MB.

The second was the Guidelines for Identification Audiometry (), adopted by ASHA in November The third was the Manual Pure-Tone Threshold Audiometry Guidelines (), adopted by ASHA in November ASHA encourages the professional community to use these guidelines.

Handbook of Environmental Acoustics simplifies this decision-making process and provides easy-to-follow explanations of acoustic terminology, noise control design, and regulatory noise issues.

The book clarifies key aspects of environmental noise in basic language, covering:5/5(2). Building on the engineering fundamentals, it provides you with specialist knowledge and skills, so you are ready to develop a career as a future leader in environment acoustics.

The course is endorsed by the Institute of Acoustics for the purposes of meeting the educational requirements for Corporate Membership of the Institute. In the absence of specific requirements or criteria, Annex A provides qualification criteria and measurement requirements to qualify anechoic and hemi-anechoic spaces for general purpose acoustical measurements.

ISO describes the divergence loss method for measuring the free sound field performance of an acoustic ry: w. tures to vibratory forces. To gain such an understanding an accurate, reliable and versatile vibration transducer is required.

In addition, advanced measure-ment and analysis equipment is often used. However, both the versatility and capability of such equipment would be wasted without an accurate vibration signal from a reliable vibration. bearing calculation requires hydrophone spacing (i.e., aperture) of one-half the wavelength of the received signal.

For example, the wavelength for a Hz signal is m, for a kHz signal is 10 cm, and for a kHz signal is 10 Size: KB.a list of device specifications including, but not limited to: temperature range, accuracy, and precision; c. the ambient temperature environment (range) in which the device may be used; d.Acoustic Response of an Impact Stop A Major Qualifying Project Submitted to the Faculty Of the WORCESTER POLYTECHNIC INSTITUTE In Partial Fulfillment of the Requirements for the Degree of Bachelor of Science By _____ Adam B.

Belanger require both strength for dimensional accuracy and low acoustic response. The results and.