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Monday, April 20, 2020 | History

3 edition of Performance optimization of a rotor alone Nacelle for acoustic fan testing found in the catalog.

Performance optimization of a rotor alone Nacelle for acoustic fan testing

C. C. Cunningham

Performance optimization of a rotor alone Nacelle for acoustic fan testing

  • 347 Want to read
  • 25 Currently reading

Published by National Aeronautics and Space Administration, Glenn Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], Springfield, VA .
Written in English

    Subjects:
  • Acoustic properties.,
  • Automatic control.,
  • Error analysis.,
  • Nacelles.,
  • Rotor speed.,
  • Test chambers.,
  • Wind tunnel tests.

  • Edition Notes

    StatementC.C. Cunningham, W.K. Thompson, and C.E. Hughes.
    Series[NASA technical memorandum] -- NASA/TM-2000-210599., NASA technical memorandum -- 210599.
    ContributionsThompson, W. K., Hughes, C. E., NASA Glenn Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16012049M

    Acoustic Noise Reduction and Power Factor Correction in 39 Fig. 5. SRM model conguration. Fig. 6. Asymmetric converter for SRM. reluctance motor for a nite set of currents and rotor positions are implemented in the lookup Tables of the model. The load dynamic equation is: J d w m dt + B w m = Te T` (2) where, Te is the electromagnetic. The backward-curved centrifugal fan with rectangular casing is used to the air conditioners and the air cleaners that is required the compact and flexible design. We have studied the fan with rectangular casing by experiments and numerical simulation. It is pointed out that the performance of the fan with the rectangular casing is better than. Kamaya et al. examined the characteristics of a small fan with a diameter of mm, but few other researchers have published reports on fans of this size. The objective of the research by Kamaya et al. was reduce the noise emitted by the fan adjusting the clearance between the fan blades and the frame, and the shapes as seen from.


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Performance optimization of a rotor alone Nacelle for acoustic fan testing by C. C. Cunningham Download PDF EPUB FB2

Performance Optimization of a Rotor Alone Nacelle for Acoustic Fan Testing c.c. Cunningham, W.K. Thompson, and c.E. Hughes Glenn Research Center, Cleveland, Ohio Prepared for the 39th Aerospace Sciences Meeting and Exhibit sponsored by the American Institute of Aeronautics and Astronautics Reno, Nevada, JanuaryNational Aeronautics andFile Size: 9MB.

The Rotor Alone Nacelle (RAN) system, developed at GRC by the Engineering Design and Analysis Division (EDAD) and the Acoustics Branch, used nacelle-mounted lasers and an automated control system to maintain concentricity as thermal and thrust operating loads.

Performance optimization of a rotor alone Nacelle for acoustic fan testing (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: C C Cunningham; W K Thompson; Christopher E Hughes; NASA Glenn Research Center.

Additional Physical Format: Online version: Cunningham, C. Performance optimization of a rotor alone Nacelle for acoustic fan testing (OCoLC) For the rotor alone testing, the fan and nacelle, including the inlet, external cowl, and fixed area fan exit nozzle, were modeled in the test hardware; the internal outlet guide vanes located.

testing of a rotor alone nacelle (RAN) in NASA Glenn's 9'x15' Low Speed Wind Tunnel (LSWT) is presented. The purpose of the RAN system was to provide an "acoustically clean" flow path within the nacelle to isolate that portion of the total engine system acoustic signature attributed to.

4 Improving Fan System Performance Axial fans, as the name implies, move an airstream along the axis of the fan. The air is pressurized by the aerodynamic lift generated by the fan blades, much like a propeller and an airplane wing.

Although they can sometimes be used interchange-ably with centrifugal fans, axial fans are commonly. Fan Noise Source Diagnostic Test: Rotor Alone Aerodynamic Performance Results [Christopher E. Hughes, Nasa Technical Reports Server (Ntrs), Et Al] on *FREE* shipping on qualifying offers.

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchersCited by: Performance optimization of a rotor alone nacelle for acoustic fan testing.

Cunningham, W. Thompson and; Tunnel testing of the Wright brothers Model B airfoil. Drew Landman, Julian Alvarez, Determination of noise sources within a high-speed jet via simultaneous acoustic measurements and real-time flow.

Hileman, B. Thurow and. HE HIGH AERODYNAMIC PERFORMANCE LOW -NOISE FAN FOR BY 4 M ACOUSTIC WIND TUNNEL sections are m/s and m/s, respectively. The required OASPL of the background noise is dB(A) at the wind speed of 80m/s [14] (calculated based on the 1/3rd octave spectrum in the frequency range of Hz to 20 kHz ofFile Size: KB.

The basic idea of the shape optimization is to minimize the far field acoustic radiation by controlling the geometry of an engine duct. A noise prediction and optimization system for turbofan. An optimal procedure for the design of rotor blade that generates low vibratory hub loads in nonaxial flow conditions is presented and applied to a helicopter rotor in forward flight, a condition where vibrations and noise become severe.

Blade shape and structural properties are the design parameters to be identified within a binary genetic optimization algorithm under aeroelastic stability Cited by: 2.

Acoustic Performance of an Advanced Model Turbofan in Three Aeroacoustic Test Facilities [Nasa Technical Reports Server (Ntrs)] on *FREE* shipping on qualifying offers.

A model advanced turbofan was acoustically tested in the NASA Glenn 9. mental results such as performance and sound characteristics, turbulent inflow statistics and far field sound spectra. A further objective is to present the test rigs which were used to obtain those data. DESIGN PHILOSOPHY AND FAN GEOMETRY The University of Siegen axial fan "USI7" is a low pressure rotor-only fan with a low solidity blade.

Overview of Lecture • Noise Sources and Generation Mechanisms – Sources of Noise for Typical Fans – Fluid-Structure Interaction as a Noise Generation Mechanism – Coupling to the Duct: Propagating Modes and Cut-off Phenomena • Modeling of Fan Noise The Acoustic Analogy Computational Methods:Aeroacoustics and UnsteadyAerodynamics The Linear Cascade Model.

Optimization of Air Induction System for Acoustic Performance Sri Siva Sai Meduri QuEST Global Services Pte Ltd Sundaram V, Sathish Kumar S FCA Engineering India Pvt Ltd GT CONFERENCE INDIA – Pune, India.

© FCA US LLC. Research Article Optimal Design and Acoustic Assessment of Low-Vibration Rotor Blades dini, 1 ne, 1 e, 2 ni, 1 etti 1 Department of Engineering, Roma Tre University, Rome, Italy Department of Mechanical, Materials and Manufacturing Engineering, e University of Nottingham, Nottingham NG R D, UK.

A baseline supersonic throughflow fan has been designed and tested at the NASA Lewis Research Center in order to demonstrate proof-of-concept and provide an experi­ mental data base for this unique type of turbomachine. The aerodynamics of the rotor, which was tested in both an isolated and a stage configuration, is discussed in somewhat.

For these architectures, fan noise is projected to become the dominant source overall. In a classical turbofan as the present configuration, the interaction between the wake of the rotor and equally-distributed Outlet-Guide Vanes (OGV) has been found to be the dominant mech-anism that contributes to fan noise (Ruijgrok, ; Peake and Parry.

Acoustic Optimization of Rotor-Stator Interaction Noise by Trailing-Edge Blowing Michael Kohlhaas1, Konrad Bamberger,2 and Thomas Carolus3 Institut für Fluid- und Thermodynamik, Universität Siegen, Paul-Bonatz-Str. Siegen, Germany The paper deals with a novel approach for minimizing tonal rotor-stator interaction noise.

The aerodynamic test rig was set up according to the Chinese National Standard GB/T and GB/T for the industrial fan performance and conditions, which corresponded to the ISO ().As shown in Fig.

2, it mainly consisted of the pressure orifices (for measuring fan static pressure and discharge flow rate), thermometer (for measuring the fan outlet temperature), multiple Cited by: 7. In order to analyze the influence of the inner-outer diameter ratio of the fan upon the aerodynamic and acoustic performance of the unit when the external diameter of the fan is fixed at mm, five cases of inner-outer diameter ratios, i.e.(prototype value), and are chosen for calculating the FR and the BSPL, and Cited by: 2.

The mesh was built according to a nonorthogonal body fitted coordinate system with an immersed blade, using a block-structured topology. The mesh consisted of about 9 × 10 6 nodes and hexahedral cells. Table 3 provides details of the rotor grid. Concerning the distribution of the elements in the axial direction, it consists of 16%, 50% and 34% of nodes respectively upstream of the leading Author: Stefano Bianchi, Domenico Borello, Alessandro Corsini, Franco Rispoli, Anthony G.

Sheard. A Novel Numerical Approach for Generation and Propagation of Rotor-Stator Interaction Noise by Krishna Patel A Thesis Submitted to the acultFy of Graduate Studies through the Department of Mechanical, Automotive & Materials Engineering in Partial ul llmenF t of the Requirements for the Degree of Master of Applied Science at the University of.

Acoustic engineers always face challenges for achieving optimized AIS design with packaging space constraints. Conventionally, AIS optimization is an iterative procedure. This paper emphasizes a one dimensional (1D) approach for optimization of AIS to meet the functional requirements for flow and : Manish Dixit, Deepak Mudgal, Saurabh Gandhe.

Anju and Rajasekaran Design and Performance Analysis of High Speed Switched Reluctance Motor Drive for Various Industrial Applications Fig. 8/6 pole SRM The controllable parameters of SRD are turn-on angle, turn-off angle, phase voltage and phase current. And the control strategies commonly used in this SRD are mainFile Size: KB.

Topology design of reactive mufflers for enhancing their acoustic attenuation performance and flow characteristics simultaneously Jin Woo Lee Division of Mechanical Engineering, Ajou University, San 5 Woncheon‐Dong, Yeongtong‐Gu, Suwon –, Republic of Korea.

The Acoustic and Language Model Optimizer Scheduler Use the Acoustic and Language Model Optimizer Scheduler to set up or revise the schedule for user profile optimization tasks. Because optimization can require a significant amount of your computer's resources, Nuance recommends that you schedule the tasks to run when your computer is idle.

In addition, the design optimization fan's aerodynamicperformance as well as its sound power. As a result, some component of the here along with the optimum, low noise fan design that resulted from the extensive testing program that was conducted as part of this : J Stuart Bolton, Peter Konieczny.

moderating motor shaft power absorbed by the fan, while retaining the original cooling capacity. The datum fan was a radial flow rotor with radially aligned straight blades. The aerodynamic performance and acoustic behaviour of the datum fan have been measured, in order to establish a basis for redesign.

Counter-Rotation, Performance, Acoustic Noise. Introduction. Wind is clean, renewable and. homegrown. energy resource for the electrical power generation, and has been utilized effectively to cope with the warming global environment.

The traditional wind turbines with the large sized wind rotor generate the high output at theAuthor: K. Kubo, T. Kanemoto. The common reactive muffler has poor acoustic properties in high frequency, so aluminum foam is applied to the reactive muffler and the impendence compound muffler is designed.

The acoustic performance of the muffler is analyzed; the interior sound field of the muffler is modeled and meshed in the ANSYS, then they are imported into SYSNOISE, and imposed reasonable boundary conditions to Author: Huai Qian Bao, Chang Tian Wang, Jun Li.

T1 - Characteristics of Blade Passing Frequency Noise of a Centrifugal Fan, and a Method for Noise Reduction. AU - Ohta, Yutaka. AU - Outa, Eisuke. AU - Tajima, Kiyohiro. PY - /1/1. Y1 - /1/1. N2 - Fan noise data are categorized into source characteristic terms and a frequency response term expressing attenuation in the propagation by: 2.

clearance of % fan diameter is ignored by extruding the blades to the duct. Although tip flow leakages could generate quadrupole type broadband noise, the latter is thought to be negligible in this low speed application. The finest grid resolution around the rotor and stator is % fan diameter and % fan diameter in the inter-stage space.

Inlet flow distortions, which are caused by fluid mixing, cause a significant deterioration in fan performance. An experimental test rig for an industrial fan with dual inlets and a mixing chamber was constructed. The flow fields in the mixing chamber of the fan were numerically investigated. Consequently, impact parameters, including the length of the mixing chamber (,and mm) Cited by: 2.

• imperfect rotor dynamics • eccentricity of the fan • Vibration of the bearing system • Noise due to secondary flow through the cooling channels • Low geometrical resolution of rapid prototyping Traditional development cycle for small axial fans 1.

Design the blade geometry 2. Diesel Engine Cooling Fan Specifications - rpm = - Flow rate = 6 m3/s - Pressure = kPa - Hub diameter = m - Tip diameter = m - Number of blades = 9 - Solidity = 82% - Max. phase shift = 28 degrees An application to engine cooling systems.

schlensok c., henneberger g. () comparison of stator- and rotor-force excitation for the acoustic simulation of an induction machine with squirrel-cage rotor. In: Wiak S., Dems M., Komęza K. (eds) Recent Developments of Electrical by: 1. Aeroacoustic Optimization of a Low-Speed Fan João Miguel Rebelo Branco Thesis to obtain the Master of Science Degree in Aerospace Engineering Supervisor: Prof.

André Calado Marta Examination Committee Chairperson: Prof. Fernando José Parracho Lau Supervisor: Prof. André Calado Marta Member of the Committee: Prof. Luís Manuel Braga da Costa File Size: 4MB. optimize the performance of a single stage stable LNA through an optimization algorithm. Our optimized single stage LNA circuit provides a gain of dB and noise figure of dB.

These are the most important design parameter of a LNA. In this design, a microwave BJT numbered AT from Avago technologies was used. Therefore, if the sound source fan is installed in a Helmholtz resonance vessel, the vessel will become a speaker and noise will be increased. (2) The peak fan noise is the fan noise of rotation.

The turbulent flow sound in all frequency bands is increased gradually with increase of speed, and never Size: KB.REFERENCE – ACOUSTIC PERFORMANCE UL Classified Acoustical Performance Summary Acoustic Performance Product Family Sound absorption co-efficientsA – e mounting Published Articulation Value: Sound C Absorption B Published Value: Sound Transmission Class Total Acoustics Hz Hz Hz Hz Hz Hz NRC D CACD Mineral Fiber.Acoustic source identification of an axial fan in a duct considering the rotation effect.

Heo YH(1), Ih JG(1), Bodén H(2). Author information: (1)Center for Noise and Vibration Control, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeonby: 2.