scholarly journals Numerical Analysis of Indoor Sound Quality Evaluation Using Finite Element Method

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yu-Tuan Chou ◽  
Shao-Yi Hsia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Speech Intelligibility ◽  
Sound Absorption ◽  
Multipath Propagation ◽  
Sound Field ◽  
Interior Space ◽  
Environmental Friendliness ◽  
Indoor Space ◽  
Element Method

Indoors sound field distribution is important to Room Acoustics, but the field suffers numerous problems, for example, multipath propagation and scattering owing to sound absorption by furniture and other aspects of décor. Generally, an ideal interior space must have a sound field with clear quality. This provides both the speaker and the listener with a pleasant conversational environment. This investigation uses the Finite Element Method to assess the acoustic distribution based on the indoor space and chamber volume. In this situation, a fixed sound source at different frequencies is used to simulate the acoustic characteristics of the indoor space. This method considers the furniture and decoration sound absorbing material and thus different sound absorption coefficients and configurations. The preliminary numerical simulation provides a method that can forecast the distribution of sound in an indoor room in complex situations. Consequently, it is possible to arrange interior furnishings and appliances to optimize acoustic distribution and environmental friendliness. Additionally, the analytical results can also be used to calculate the Reverberation Time and speech intelligibility for specified indoor space.

scholarly journals A Hybrid Smoothed Finite Element Method for Predicting the Sound Field in the Enclosure with High Wave Numbers

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Haitao Wang ◽  
Xiangyang Zeng ◽  
Ye Lei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sound Field ◽  
Numerical Dispersion ◽  
Computational Accuracy ◽  
Dispersion Error ◽  
High Wave ◽  
Wave Numbers ◽  
Smoothed Finite Element Method ◽  
Element Method

Wave-based methods for acoustic simulations within enclosures suffer the numerical dispersion and then usually have evident dispersion error for problems with high wave numbers. To improve the upper limit of calculating frequency for 3D problems, a hybrid smoothed finite element method (hybrid SFEM) is proposed in this paper. This method employs the smoothing technique to realize the reduction of the numerical dispersion. By constructing a type of mixed smoothing domain, the traditional node-based and face-based smoothing techniques are mixed in the hybrid SFEM to give a more accurate stiffness matrix, which is widely believed to be the ultimate cause for the numerical dispersion error. The numerical examples demonstrate that the hybrid SFEM has better accuracy than the standard FEM and traditional smoothed FEMs under the condition of the same basic elements. Moreover, the hybrid SFEM also has good performance on the computational efficiency. A convergence experiment shows that it costs less time than other comparison methods to achieve the same computational accuracy.

Analysis of Acoustic Performance of Compound Muffler by Finite Element Method

2012 ◽  
Vol 529 ◽  
pp. 257-263
Author(s):  
Deng Hui Cai ◽  
Xin Tan Ma
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Transmission Loss ◽  
Complex Structure ◽  
Three Dimensional ◽  
Sound Field ◽  
Acoustic Vibration ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Element Method

Since the theory of one-dimensional plane wave can not accurately predict the internal sound field of the complex structure muffler. The three-dimensional finite element method is adopted to establish the acoustic model of the composite muffler based on the application of composite muffler model. Transmission loss and characteristics of internal sound field of the composite muffler's are calculated through acoustic vibration software Sysnoise. The calculation shows that the muffler under the interference of fluid flow has the higher transmission loss compared with the absence of liquidity function with an additional silencer band. The analysis method and conclusions provide a basis for the design of composite muffler.

Optimized Finite Element Method for Acoustic Scattering Analysis With Application to Head-Related Transfer Function Estimation

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Mahdi Farahikia ◽  
Quang T. Su
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hearing Aids ◽  
Transfer Functions ◽  
Acoustic Scattering ◽  
Sound Field ◽  
Solid Sphere ◽  
Maximum Deviation ◽  
Logarithmic Scale ◽  
Element Method

Obtaining head-related transfer functions (HRTFs) is a challenging task, in spite of its importance in localizing sound in a three-dimensional (3D) environment or improving the performance of hearing aids, among their various applications. In this paper, an optimized finite element method through adaptive dimension size based on wavelength (frequency) for acoustic scattering analyses using ansys is presented. Initial investigation of the validity of our method is conducted by simulating scattered sound field for a solid sphere exposed to a far-field plane sound wave at 100 (equally spaced in logarithmic scale) frequencies between 20 and 20 kHz. Comparison of the equivalent HRTF results between the two methods shows a maximum deviation of less than 0.6 dB between our method and the analytical solution depending on the angle of rotation of the sphere with respect to sound source.

scholarly journals 1317 Sound Field Analysis of Ultrasonic Cleaner Using Finite Element Method

2009 ◽  
Vol 2009.47 (0) ◽  
pp. 459-460
Author(s):  
Ken-ichi YANO ◽  
Noritoshi NAKAGAWA ◽  
Chaoqun Wu ◽  
Yasuhisa SEKIGUCHI
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sound Field ◽  
Field Analysis ◽  
Element Method

Estimation of Sound Absorption Performance of Complex Perforated Panel Absorbers by Numerical Finite Element Method and Examinining the Role of Different Layouts Behind It

2019 ◽  
Vol 18 (03) ◽  
pp. 1950013
Author(s):  
Z. Hashemi ◽  
M. R. Monazzam ◽  
A. Fahim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sound Absorption ◽  
Current Method ◽  
The Finite Element Method ◽  
Impedance Tube ◽  
Absorption Performance ◽  
Numerical Finite Element ◽  
Element Method

Perforated panels are one of the structures that are widely used nowadays. The sound absorption behavior of materials is studied by solving the equations governing the wave propagation in these materials. In this paper, the finite element method (FEM) was used to predict the absorption performances of few different perforated composite panels. Also, the studied structures were examined by two-microphone impedance tube to validate the results of the numerical method. The relative consistency of the results of the current method with the results of the impedance tube suggests the accuracy of this method in simulating the absorption rate of perforated composites. In addition, the results of evaluating various layouts (arrangements) showed that the use of absorber materials with higher flow resistivity at the back of the perforated panel and at the beginning of the sound wave entry increases the absorption performance by 1.6 times than that of the inverse layout ratio.

scholarly journals Finite-Element Method for Calculating the Sound Field in a Tank with Impedance Boundaries

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Qi Li ◽  
Junhua Xing ◽  
Rui Tang ◽  
Yiming Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Standing Waves ◽  
Sound Field ◽  
Water Tank ◽  
Wave Tube ◽  
Finite Element Software ◽  
Standing Wave Tube ◽  
Element Method

In this paper, a finite-element method for calculating the sound field in a water tank with impedance boundaries is proposed based on the theory of standing waves in a tube. The equivalent acoustic impedance of the tank walls is calculated by establishing a three-dimensional axisymmetric virtual standing-wave tube in finite-element software, whereupon boundaries with that impedance are used as the tank boundaries. Since the impedance is the property of the material itself, the calculated impedance value can be used for the calculation of the three-dimensional sound field. The sound field due to a point source in a glass tank is calculated using the proposed method, the correctness of which is assessed experimentally. By comparing the experimental and numerical results, the proposed method is shown to be correct.

Optimization of Sound Source Model for the Simulation of High Speed Train Interior Noise Using Finite Element Method

2014 ◽  
Vol 1061-1062 ◽  
pp. 776-779
Author(s):  
Di Wu ◽  
Jian Min Ge
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Acoustic Analysis ◽  
Sound Field ◽  
Source Model ◽  
High Speed Train ◽  
Area Source ◽  
Good Agreement ◽  
Element Method

When finite element method was adopted in acoustic analysis, area source was defaulted to be of the same amplitude and phase in its whole region. While in practical, there are differences in amplitude and phase between different parts of the area. In this paper, the area source was divided into several sub-area sources so that the source can be modeled with higher accuracy. The optimized area sources were used in simulation of interior sound field of high-speed train. Calculations prove that the simulated result has very good agreement with the measured one.

Sign in / Sign up

Export Citation Format

Share Document