Model-scale sound propagation experiment

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National Aeronautics and Space Administration, Langley Research Center , Hampton, Va
Sound -- Transmis
Other titlesModel scale sound propagation experiment.
StatementWilliam L. Willshire.
SeriesNASA technical memorandum -- 100602.
ContributionsLangley Research Center.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL18030651M

The purpose of this paper is to report the results of a scale model propagation ex- periment to investigate grazing propagation above a finite impedance boundary.

The experiment used the same ground plane and was performed in the same anechoic chamber as the model scale propagation experiment described in reference 1.

The first experiment. Note: Model-scale sound propagation experiment book are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

Full text of "Model-scale sound propagation experiment" See other formats NASA Technical Memorandum Model-Scale Sound Propagation Experiment (NASA-TM) HODEL-SCALE SOOND N PROPAGATION EXPERIMENT (NASA) 32 pCSCL 20A Unclas G3/71 William L.

Wiltshire, Jr. April NASA National Aeronautics and Space Administration Lengtoy. Journal of Sound and Vibration () (2), ACOUSTIC BOUNDARY LAYER INFLUENCE ON SCALE MODEL SIMULATION OF SOUND PROPAGATION: EXPERIMENTAL VERIFICATION M.

ALMGREN Department of Building Acoustics, Chalmers University of Technology, S 96 GSteborg, Sweden (Received 5 October ) The theoretically predicted effect [1] of the acoustic boundary Cited by: 4. Journal of Sound and Vibration () (2), ACOUSTIC BOUNDARY LAYER INFLUENCE ON SCALE MODEL Model-scale sound propagation experiment book OF SOUND PROPAGATION: THEORY AND NUMERICAL EXAMPLES M.

ALMGREN Department of Building Acoustics, Chalmers University of Technology, S 96 Geborg, Sweden (Received 30 Januaryand in revised form 3 May ) Scale model Cited by: 9.

Dec 11,  · This paper discusses the design and operation of a measurement apparatus used to conduct scale-model underwater acoustic propagation experiments, presents experimental results for an idealized waveguide, and compares the measured results to data generated by two-dimensional (2D) and three-dimensional (3D) numerical models.

The main objective of this paper is to demonstrate the Author: Jason D. Sagers, Megan S. Ballard. Numerical Modelling and Laboratory Experiments on Underwater Sound Propagation Over a Shear Supporting Bottom The experiment was carried out at model scale in a large water tank, and measured the transmission loss, as a function of depth and range, in a water column above a geoacoustic model of the sediment and sub-bottom.

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Glegg S.A.L Author: Allen Hundley, Stewart A. Glegg, Juan I. Arvelo, Herbert Uberall. Model scale tests to investigate the sound propagation through the engine nozzle system and the jet shear layers were carried out.

The present paper focuses on fan noise radiation from the bypass. A New Algorithm for the Nonlinear Propagation of Broadband Jet Noise Article in AIAA Journal 47(1) · January with 21 Reads How we measure 'reads'. identifying nonlinear propagation effects via comparisons of power spectra measured at different distances.

This can be of particular importance in anechoic, model-scale jet noise measurements, where many frequencies of interest are above the audio range and maximum propagation range is limited by chamber size.

Limitations in. Very often the scale model is smaller than the original and used as a guide to making the object in full size. Scale models are built and collected for many reasons including, in engineering, for.

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF.

Visit to get more information about this book, to buy it in print, or to download it as a free PDF. Application of 'steady' state finite element and transient finite difference theory to sound propagation in a variable duct - A comparison with experiment K. BAUMEISTER, W.

EVERSMAN. Via Inductance II. The following values for the inductance of an interplane via were collected using the incremental inductance technique described in chapter 5 ofHigh-Speed Signal Propagation: More Black Magic, and discussed in detail during my video "Inductance of Via", which will be shown as part of my new Advanced class.I hope you find the numbers.

Scale model experiments on floating offshore wind turbines A Thesis Research Report Submitted to the Faculty of WORCESTER POLYTECHNIC INSTITUTE in partial fulfillment of the requirements for the Degree of Masters of Science In Mechanical Engineering SUBMITTED BY: _____ Syed Kazim Naqvi May APPROVED BY.


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Babinsky, H and Harvey, JK () Shock Wave-Boundary-Layer Interactions. Cambridge Univ Pr. Book Section. Nübler, K and Colliss, SP and Lutz, T and Babinsky, H and Krämer, E () Numerical and experimental examination of shock control bump flow physics.

Variability due to short-distance favorable sound propagation and its consequences for immission assessment. Van Renterghem and D. Botteldooren. Model-scale jet noise analysis with a single-point, frequency-domain nonlinearity indicator A loudness experiment. Fabien Bonnet, Hugues Nélisse and Jérémie Voix.

Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency.

For example: if a newborn baby's heart beats at a frequency of times a In SI base units: s−1. Task is specifically devoted to the experimental validation in model scale of the predictive methods developed in task This activity includes a proper validation of the velocity field to the propeller, of the cavitation patterns on the blades and of the noise radiated by the operating propeller.

A model solar system can be easily constructed on school grounds. In this outdoor lab, students walk between planets answering a series of questions from a worksheet. The solar system is scaled down so that the Sun is the size of a standard inch basketball (scale is approximately 1 inch = 91, miles).

See chart below. ITTC – Recommended 02 Procedures and Guidelines – –01–05 Page 3 of 16 Model scale noise measurements Effective Date Revision 00 test facilities and within an acceptable range of test-section blockage, to achieve the highest possible Reynolds number.

A typical diameter for a model scale propeller is mm. The ac. Auralization of Flyover Noise from Open Rotor Engines Using Model Scale Test Data. Stephen A. Rizzi, David Stephens, Jeffrey J. Berton Compressive sensing based beamforming and its application in aeroacoustic experiment.

Qingkai Wei, Wenjun Modelling the Nonlinear Sound Propagation and Radiation of Supersonic Fan Tones. Oluwaseun E. Physical modelling of hydraulics Introduction Definition: the physical hydraulic model A physical model is a scaled representation of a hydraulic flow situation.

Both the boundary conditions (e.g. channel bed, sidewalls), the upstream flow conditions and the flow field must be scaled in an appropriate manner (Fig. ).Cited by: 4.

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Acoustic software was used to compute the sound propagation on the surface of bogies.

The model scale was The experimental model was shown in Fig. 20(a). Head and tail shapes of the train model were completely symmetrical. Based on position characteristics of several major noise sources of the train model, the experiment Cited by: 2. The first experiment included a background speaker to provide interference noise at three different Signal-to-Noise Ratios to simulate noise propagating down a wind tunnel circuit.

The second experiment contained only the primary source and the wedges were removed from the floor to simulate reflections found in a wind tunnel environment. Although noise can be generated by turbulence in highspeed flows, most noise is generated by mechanical motion caused by forces acting on structures.

The motion can be very complex—for example, in the case of a panel on a machine. Consequently, the coupling between the moving structure and air. That was one of several trial programs that were undertaken by EPA at that time.

Other work included a number of system studies on airport noise and aircraft noise for FAA or EPA, environmental pollution type studies, sound propagation studies relative to siren propagation for warning sirens around nuclear plants. We will start here by using the largest object in the solar system, the Sun, as an exam-ple for how we will determine how large the planets will be in our scale model of the solar system.

The Sun has a diameter of ∼ 1, ( million) kilometers, more than times greater than the Earth’s diameter. "TO CREATE INFRASTRUCTURE AND EXPERTISE IN ORDER TO CARRY OUT R & D WORK IN AREAS OF OCEAN ENGINEERING AND RELATED FIELDS, WHICH HAVE DIRECT RELEVANCE IN THE NATIONAL CONTEXT." A First Course, Narosa Book Distributors, India.

Advanced Marine Vehicles HSE Management in Petroleum and Offshore Engineering, & Then, on the output of this classifier, sonification was performed (which means the conversion of the signal into sound files).

Then, there was a second ML classifier that operates this raw sound for LABS and image analysis for OBS. This algorithm provided AUC of ; AUC for raw sound wasfor FFT was and for spectrogram was Cited by: 1. Dec 26,  · Aircraft antenna wire. Posted by skipper on Wednesday, December 26, PM Just a quick question.

I've seen posts that shows aircraft antenna wire that looks very realistic. Can anyone tell me, or provide a web link that explains how this is accomplished?

I .A New Experimental Database for the Investigation of Soot in a Model Scale Swirled Combustor Under Perfectly Premixed Rich Conditions. M A Novel Reheat Combustor Experiment for the Analysis of High-Frequency Flame Dynamics: Concept and Experimental Validation Experimental Analysis of Wave Propagation in a Methane-Fueled Rotating.Small-scale model experiments Scale model experiments with frigate type hull forms have been used to investigate these two flow noise mechanisms.

In global terms, they depend on the non-dimensional Froude, Reynolds and Weber numbers, on the turbulence intensity and also on the water quality.

To scale the wave pattern.