Comparison of Noise Attenuation Level by Convergent and Divergent Cylindrical Duct with Space Constraints
نویسنده
چکیده
This paper shows the details of comparison of noise attenuation level by convergent and divergent cylindrical duct with space constraints by using Transmission loss parameter. Reactive muffler is noise reduction element on exhaust system. Two basic term is used for noise attenuation first is transmission loss (TL) and other is insertion loss (IL). The main aim of this paper is to use of TMM, FEA (Wave 1-D & Comsol) as well experimental method (two load method) for muffler’s TL measurement for central inlet and side outlet position. Afterword to achieve by proven results analysis is done for convergent and divergent cylindrical duct. Also FEA based tool Comsol Multiphysics and Wave 1-D is used to validate and comparing the results. FEA tool is used for virtual prototyping which has already validated with various case studies. Also by comparing the experimental results by fabricated muffler with FEA results for central inlet and central outlet shows the validation of results. So the optimization can be achieved by using FEA tool by using virtual protyping.
منابع مشابه
Application of Single-Frequency Time-Space Filtering Technique for Seismic Ground Roll and Random Noise Attenuation
Time-frequency filtering is an acceptable technique for attenuating noise in 2-D (time-space) and 3-D (time-space-space) reflection seismic data. The common approach for this purpose is transforming each seismic signal from 1-D time domain to a 2-D time-frequency domain and then denoising the signal by a designed filter and finally transforming back the filtered signal to original time domain. ...
متن کاملThe Impact of Divergent and Convergent Tasks on Iranian EFL Students’ Reading Comprehension Success
This study was an attempt to investigate the effect of divergent and convergent tasks on intermediate EFL students' reading comprehension success. The participants of this study involved sixty male and female EFL learners who were enrolled in the intermediate level at Kish English Institute in Yasuj. To make them homogeneous in terms of their general English knowledge, they were asked to take p...
متن کاملSpatial modelling of railway noise propagation
In recent decades, population growth and progress of technology have shaped large and compact urban settlements. Existence of huge transportation systems and developed urban infrastructures are among the most important properties of modern cities. In spite of prompt transit and facilitated daily activities, development of transportation systems causes many problems, including traffic, air and n...
متن کاملThe impact of physical spaces on divergent and convergent problem-solving performance
What consequences does the embodied and situative nature of cognition have for problem solving? Research on situative and embodied cognition has shown that certain aspects of attention and perception are attuned to physical characteristics and settings (Bhalla & Proffitt, 1999). Further, some recent research has suggested that the cognitive and neural substrates of search processes in semantic ...
متن کاملDisplacement Field Due to a Cylindrical Inclusion in a Thermoelastic Half-Space
In this paper, the closed form analytical expressions for the displacement field due to a cylindrical inclusion in a thermoelastic half-space are obtained. These expressions are derived in the context of steady-state uncoupled thermoelasticity using thermoelastic displacement potential functions. The thermal displacement field is generated due to differences in the coefficients of linear therma...
متن کامل