دانلود رایگان مقاله لاتین ماتریس انتقال برای تضعیف صدا از سایت الزویر
عنوان فارسی مقاله:
روش ماتریس انتقال برای تضعیف صدا در رسنترس با ورودی های مزاحم سوراخ دار
عنوان انگلیسی مقاله:
Transfer matrix methods for sound attenuation in resonators with perforated intruding inlets
سال انتشار : 2017
برای دانلود رایگان مقاله ماتریس انتقال برای تضعیف صدا اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Recently, research on traditional silencers (expansion chamber muffler [1], quarter wavelength tube [2], concentric perforated resonator [3], etc.) has been continuously addressed. However, the research on resonators with perforated intruding inlets (PII) which could distinctly improve the acoustic performance has been neglected. As a promising kind of silencer element, a resonator with PII has the advantages of a compact structure and a desirable sound attenuation performance especially at mid and high frequencies [4]. Compared to the extended-tube resonator, additional perforations can effectively adjust and probably widen the frequency range of sound attenuation. Considering the design and engineering application of resonators with PII, it is significant to develop analytical approaches applied in the prediction for the transmission loss (TL). The transfer matrix method [5] (TMM) based on plane wave theory is to obtain the four-pole parameters of a resonator, which are used to determine the TL. Chiu [6] used a one-dimensional (1D) TMM to calculate the TL of a muffler with perforated intruding inlet. In addition, with the effect of higher order modes excluded, the 1D approach is limited to the cut-off frequencies of plane wave [7]. Finite element method (FEM) takes more geometry details and three-dimensional effects into account [8], hence it can predict the acoustic performance more precisely. However, the model design and calculation process are time-consuming. It is also inconvenient to optimize the structure parameters if the acoustic performance is not satisfying. Therefore, apart from the 1D TMM, it is also necessary to develop a theoretical method, which is simultaneously accurate and efficient to calculate the TL of resonators with PII. A two-dimensional (2D) method is applicable to calculate the TL for axisymmetric resonators. Selamet [9,10] predicted the TLs of both a single-chamber and a dual-chamber circular expansion muffler with extended inlet/outlet using a 2D weightedintegration method. However, the acoustic continuity equations to be solved in the approach will be complicated when many chambers are connected, since the transfer matrixes of the silencer elements are not considered and all continuity equations must be solved at one time. In recent years, the 2D approach was mostly applied to dissipative mufflers with single chambers [10–12]. Until
برای دانلود رایگان مقاله ماتریس انتقال برای تضعیف صدا اینجا کلیک نمایید.
کلمات کلیدی:
PDF]Optimization of sound transmission loss and prediction of ... - Iasir.net iasir.net/AIJRSTEMpapers/AIJRSTEM14-308.pdf In order to attenuate the engine exhaust noise, a few muffler ... analyse the tube resonator by coupling the wave propagation in the center tube and outer cavity. ... with perforated plug tube consist of four acoustical elements straight inlet duct, ...... Intruding Tubes Using A Simulated Annealing Method” Journal of Marine ... Applied Acoustics - SciTitles www.scititles.com/journal-articles/1939?page=4 The relationship between noise and mode of delivery on recognition memory and ... methods for sound attenuation in resonators with perforated intruding inlets. attenuation for the simple expansion chamber muffler with a right ... https://www.cambridge.org/.../div-class-title-attenuation-for-the-simple-expansion-cham... by CH Wu - 2011 - Cited by 7 - Related articles However, the propagation of sound in the muffler with a right angle inlet can lead its sound power to be attenuated about 10 ~ 40dB at those particular frequencies. Keywords : Muffler ..... Straight-through Resonator with Mean Flow,” Jour- nal of Sound and ... of Perforated Intruding Tube Muffler Components,”. Applied ... [PDF]Pressure Loss Analysis of the Perforated Tube Attenuator docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2378&context=iracc by Z Liu - 2014 - Related articles inlet velocity increasing and descents little with the hole diameter rising. 1. ... the attenuation analysis of the perforated intruding tube attenuator and found that the porosity is an ... is seen that increasing the diameter of the co-axial pipe improves the noise reduction for the higher frequencies, ... muffler with an end resonator.
