3 edition of Application of stiffened cylinder analysis to ATP interior noise studies found in the catalog.
Application of stiffened cylinder analysis to ATP interior noise studies
1984 by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va .
Written in English
|Statement||E.G. Wilby and J.F. Wilby.|
|Series||NASA contractor report -- 172384., NASA contractor report -- NASA CR-172384.|
|Contributions||Wilby, John F., Langley Research Center., Bolt, Beranek, and Newman, inc.|
|The Physical Object|
In both cases the results indicate that the modeling assumptions of the sequentially coupled analysis appear to be valid for the solutions in the muffler interior. Contour plots of the pressure magnitude and phase for the muffler exterior at Hz are shown in Figure 8 and Figure 9. Conclusions concerning "noise kit" effects are based on a small sample. However, these data have been useful for estimation of currently used (i.e., off-the-shelf) technology levels and for use in conjunction with the health/welfare analysis and the noise control technology analysis to set the study levels for each equipment type. analysis and design can now be done reliably using computational methods. † Hamming authored a numerical methods book many years ago. The quotation cited is the frontispiece of the book. report typos and errors to W.H. Mason Introduction Monday, Janu File Size: 1MB. Elastomeric bearings are widely used by structural engineers, but their behavior is not well understood. The paper provides a brief description of the state of knowledge throughout the world with respect to these bearings.
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Get this from a library. Application of stiffened cylinder analysis to ATP interior noise studies. [E G Wilby; John F Wilby; Langley Research Center.; Bolt, Beranek, and Newman, inc.].
The analytical model shown in Fig. 1 is a finite stiffened plate (dimensions a, b, and h) covered by a decoupling coating, which is immersed in semi-infinite water. E 1, υ 1, ρ 1, and η 1 are Young's modulus, Poisson's ratio, density, and structural loss factor of the stiffened plate, respectively.
E 2, υ 2, ρ 2, and η 2 are Young's modulus, Poisson's ratio, Application of stiffened cylinder analysis to ATP interior noise studies book, and structural loss Cited by: 7. The proposed approaches are also validated by comparing the present results with solutions of Takahashi and previous studies of stiffened plates.
Numerical results indicate that the flexural vibration of the plate has a significant effect on the sound absorption coefficient in the water but has little influence in the by: 2.
Akhilesh has 10 years of experience in the analysis and design of mufflers for automotive and industrial applications which includes consultancy. His other research interests include computational and experimental aeroacoustics, array processing techniques such as time-reversal and beamforming for source localization, and application of the.
The present paper is devoted to the analysis of the behavior of a composite reinforced cylinder under various loadings. More precisely, we present an optimization procedure which aims to choose the most efficient values of the geometric parameters defining the composite reinforcements and the most efficient position of the stiffeners on the surface of the by: Journal of 9/11 Studies Vol October, A Discussion of "Analysis of Structural Response of WTC 7 to Fire and Sequential Failures Leading to Collapse" Therese P.
McAllister, Robert MacNeill, Omer Erbay, Andrew Sarawit, Mehdi Zarghamee, Steven Kirkpatrick and John Gross Journal of Structural Engineering, JanuaryVol.No. Analysis of thick spacer fabrics to reduce automobile interior noise Article (PDF Available) in Measurement Science and Technology 18(7) May with 1, Reads How we.
Based on analysis results, new unified strength predictor equations have been developed for the stiffened plate systems with conventional steel and/or high performance steel (HPS). The noise and vibration characteristics of a prototype turbocharged gasoline engine incorporating the improved multiple-link VCR mechanism were compared with those of an internal combustion engine having a conventional piston-crank system and nearly the same configuration except for the major moving by: Generated noise of moving objects in different fluids is one the most important subjects among scientists and researchers.
Accordingly, in the present work, effects of splitters with different length and location on sound pressure level of circular cylinder are investigated by COMOSL software. Aerodynamic and aero-acoustic analyses are done in an air channel with Reynolds.
Key words: Back pressure, perforation, CFD analysis, mufflers. INTRODUCTION Engine exhaust noise is controlled through the use of silencers and mufflers. Well-designed exhaust systems collect exhaust gases from engine cylinders and discharge them as quickly and silently as possible.
Primary system design considerations include: 1. Each noise problem is different. Let us help you get the analysis you need. To find out if any of our noise prediction codes can be used for your application, please contact: Paula Dempsey, Ph.D. Danielle Koch Analysis: COMPUTATIONAL AEROACOUSTICS LABORATORY.
This paper is the second of two papers describing a method for modeling muffler components having perforated flow tubes, as for example those found frequently in Cited by: Stiffness Co of a cylinder. Because of the elasticity of oil the behaviour of a hydraulic cylinder may be described like the stiffness of a mechanical spring.
The stiffness Co of a cylinder can be described with: Under influence of an external force ΔF the cylinder piston will show a displacement ΔL.
The stiffness now may be defined with:File Size: KB. horizontal-application bearing by a factor of at rpm and a factor of at rpm.
Thus, the vertical-application bearing does impart a larger centering force to the journal relative to the horizontal-application bearing when the journal is not carrying a radial static by: 1. As the development of the economic society, the new orbit form such as modern tram track arises at the historic moment.
Considering the urban internal environment, a higher request is put forward on vibration and noise reduction.
This passage is devoted to analyze the noise reduction performance of the granule material, which gained by recycling the waste : Ting Lin Liu, Jie Ling Xiao, Zhi Peng Hu, Wang Ping. Eg: Pipes, Boilers, storage tanks etc. These cylinders are subjected to fluid pressures.
When a cylinder is subjected to a internal pressure, at any point on the cylinder wall, three types of stresses are induced on three mutually perpendicular planes. They are, 7. THIN CYLINDERS Three types of stresses: 1. Part of book: Heavy Metals. Introductory Chapter: Introducing Heavy Metals.
By Martin Koller and Hosam M. Saleh. Part of book: Heavy Metals. Synthesis of Silver Nanoparticles. By Remziye Güzel and Gülbahar Erdal. Part of book: Silver Nanoparticles - Fabrication, Characterization and Applications.
Thermochemical Treatment of Metals. Structural analysis comprises the set of physical laws and mathematics required to study and predicts the behavior of structures.
The subjects of structural analysis are engineering artifacts whose integrity is judged largely based upon their ability to withstand loads; they commonly include buildings, bridges, aircraft, and : Siddharth Rajvanshi.
Computational aeroacoustics is rapidly emerging as an essential element in the study of aerodynamic sound. As with all emerging technologies, it is paramount that we assess the various opportuni ties and establish achievable goals for this new technology.
This paper presents the application of the Self-exited Acoustical System (SAS) for monitoring stress changes in steel. The change of the speed of wave propagation, which is associated with the change of the resonance frequency in the system is caused by the deformation of the examined material.
The SAS system is based on this phenomenon and can be used for an Cited by: 1. Increasing demands on the capabilities of engine thermo-fluid dynamic simulation and the ability to accurately predict both performance and acoustics have led to the development of several approaches, ranging from fully 3D to simplified 1D models.
The quasi-3D approach is proposed as a compromise between the time-demanding 3D CFD analysis and the fast 1D approach; it Cited by: 9.
International Journal & Magazine of Engineering, Technology, Management and Research A Peer Reviewed Open Access International Journal Volume No: 2 (), Issue No: 8 (August) August Page m mass. transmission will be more. on capacity will be more. dissipation will be more.
This work presents a vibroacoustic response model for a fluid-loaded, simply supported rectangular plate covered by a composite acoustic coating consisting of damping and decoupling layers. The model treated the damping layer and base plate as a unified whole under pure bending moments and the decoupling layer as a three-dimensional, isotropic, linear elastic by: 1.
Interior cabin noise presents a challenging problem in most aircraft. The level of passenger comfort must be balanced with the cost, complexity, and physical constraints of potential noise reduction technologies.
The situation presents numerous engineering tradeoffs, and continues to evolve as new higher-powered engine designs are introduced. Current AASHTO and AISC specifications require that an intermediate transverse stiffener attached on the shear web panel be designed not only to have a proper bending rigidity to meet the simply supported condition when the web panel buckles, but to have a proper area in order to resist the compression developed due to diagonal tension in the postbuckling range as well.
2 Parchen et al.  in an airfoil side edge by using a porous material, which in turn reduced the induced drag on airframe as well as the noise generated from the pressure fluctuations at the side edge.
Geyer et al.  conducted a number of experimental studies based on. equations for application to noise evaluation from rotating blades. The current article focuses only on control surface methods (i.e.
Kirchhoff, porous FW-H) and discusses issues with their application in various types of aerocoustic problems including rotor noise, jet noise, ducted fan noise, airfoil noise etc.).
At first the main formulations Cited by: A cylinder is subjected to an internal (gage) fluid pressure of 60 MPa. If the outside radius is times the inside radius, find the maximum and minimum tangential stress in the cylinder.
Also find. A simple method is presented for modeling perforated muffler components such as concentric resonators with perforated flow tube, and expansion chambers and reverse flow chambers with perforated inlet and outlet tubes.
The theory includes mean flow, but is confined to those configurations having one acoustically long dimension. It is based on a segmentation Cited by:  Mamta G. Pawar, Monarch K. Warambhe, Gautam R. Jodh, “Design and Analysis of Clutch Using Sintered Iron as a Friction Material”, International Journal of Innovative Technology and Exploring Engineering, vol.
3, issue-7, December  Rajesh Purohita, Pooja Khitoliyab and Dinesh Kumar Kolic, “Design and Finite Element Analysis of an.
aeroacoustic noise. Recently, Berg and Zayas6 investigated both the aeroacoustic noise and aerodynamic performance of a ﬂatback airfoil design in a series of anechoic wind-tunnel experiments. Similar perfor-mance studies of ﬂatback airfoils have also been investigated experimentally and numerically.4,7 Low-ﬁdelity.
home reference library technical articles sensors, transducers and detectors chapter mean-flow effects and nonlinear acoustics Notes on Acoustics Written by a noted authority in the subject area, this book is a comprehensive study of the theory and practical application of acoustics to numerous fields.
Access study documents, get answers to your study questions, and connect with real tutors for MECHANICAL Advanced Structural Dynamics and. absorber (TVA) designed and applied on a sample supported hollow cylinder structure. Then, the mitigation in vibration amplitudes as a result of this application is investigated.
In order to see the effectiveness of the TVA application, a physical structure during the experimental studies. allow assumptions that greatly simplify the analysis of the model. Parameter variation studies are presented and discussed in detail.
Substantial insight into factors that govern the stability of this kind of high speed rotor system was obtained. A new simplified model for stiffened plates in collapse analyses is developed. The model consists of large plate elements and beam-column elements.
It is formulated according to the typical collapse modes of stiffened plates under longitudinal thrust, which are investigated by conventional Finite Element Analysis (FEA).Cited by: 6.
Aerodynamics for Engineering Students, Seventh Edition, is one of the world’s leading course texts on aerodynamics. It provides concise explanations of basic concepts, combined with an excellent introduction to aerodynamic theory.
Interface Conditions of Finite-Difference Compact Schemes for Computational Aeroacoustics This can be solved using a conventional multi-diagonal matrix inversion technique. However, since all the modiﬁed wave numbers are cou-pled, it would not be straight forward to de-rive effective coefﬁcients for a boundary com.
" A. Lafitte, F. Perot, Investigation of the Noise Generated by Cylinder Flows Using a Direct Lattice-Boltzmann Approach, 15th AIAA/C EAS Aeroacoustics Conference (30th AIAA Aeroacoustics Confer ence), 11 - 13 MayMiami, Florida,AIAA " Wilde, A., Application of the Lattice-Boltzmann method in flow acoustics.
A Study of Experimental Acoustic Modal Analysis of Automotive Interior Acoustic Field Coupled with the Body Structure The accuracy of the vibro-acoustic coupled system model for the low frequency range depends on how accurately modal characteristics are represented at the input, output, and the structure-acoustic coupling by: This thesis studies the effects of temperature in friction modeling for a harmonic drive.
A mathematic model of how friction varies with temperature change is built based on the exponential friction model. The mathematic model is then used in building the nonlinear dynamic model of the harmonic drive.
A Cascaded Fuzzy Model of friction with temperature is proposed so that the Cited by: 2.analysis of sound attenuation devices. rt is felt that the application of this facility in two experimental ~reas. could lea.d to an acceptable design method for small:filter. These areas of investigation are: * 1) The analysis of elements bnsic to the design of complex mufflers and a study of their inter-Author: Stephen Philip Buckley.