Stretched, perforated, and auralized: A case study of integrating acoustic treatment into the modern museum to control sound propagation and room acoustics.

2008 ◽  
Vol 124 (4) ◽  
pp. 2563-2563
Author(s):  
Ryan Biziorek
Keyword(s):  
Sound Propagation ◽  
Room Acoustics ◽  
Acoustic Treatment

A case study of acoustic intervention in classrooms

2020 ◽  
pp. 1351010X2097576
Author(s):  
Ajish K Abraham ◽  
M S Ravishankar
Keyword(s):  
Standard Deviation ◽  
Speech Intelligibility ◽  
Mean Value ◽  
Effective Learning ◽  
Acoustic Treatment ◽  
Speech Clarity

High reverberation times (RTs) have always been an acoustic barrier to effective learning in classrooms. Acoustic corrections to reduce RT involve complex acoustic treatment. Previous studies have indicated that classrooms in most schools do not meet the established acoustic criteria, as the school authorities refrain from such acoustic treatment. Aim of the study was to optimize the RT within classrooms through easily-implementable acoustic corrections. Different combinations of acoustic corrections have been experimented in eight classrooms, through a step-by-step approach to optimize RT. After each acoustic modification, the RT was measured and the speech clarity parameter C50, was estimated. At the final step, RT of the classrooms was diminished to a mean value of 0.74 s (standard deviation = 0.04) from the initial mean value of 4.37 s (standard deviation = 0.42). C50 values corresponding to the final acoustic correction were found to fall within good speech intelligibility scale.

The Influence of Room Acoustics on Solo Music Performance: An Empirical Case Study

2013 ◽  
Vol 99 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Zora Schärer Kalkandjiev ◽  
Stefan Weinzierl
Keyword(s):  
Music Performance ◽  
Room Acoustics ◽  
Solo Music

Beam Tracing with Refraction

2012 ◽  
Vol 37 (3) ◽  
pp. 301-316 ◽  
Author(s):  
Marjan Sikora ◽  
Ivo Mateljan ◽  
Nikola Bogunović
Keyword(s):  
Good Accuracy ◽  
Sound Propagation ◽  
Fem Simulation ◽  
Sound Intensity ◽  
Room Acoustics ◽  
Acoustic Lens ◽  
Refraction Method ◽  
Art Room ◽  
2D And 3D ◽  
3D Topology

Abstract This paper presents the beam tracing with refraction method, developed to examine the possibility of creating the beam tracing simulation of sound propagation in environments with piecewise non- homogenous media. The beam tracing with refraction method (BTR) is developed as an adaptive beam tracing method that simulates not only the reflection but also the refraction of sound. The scattering and the diffraction of sound are not simulated. The BTR employs 2D and 3D topology in order to efficiently simulate scenes containing non-convex media. After the beam tracing is done all beams are stored in a beam tree and kept in the computer memory. The level of sound intensity at the beginning of each beam is also memorized. This beam data structure enables fast recalculation of results for stationary source and geometry. The BTR was compared with two commercial ray tracing simulations, to check the speed of BTR algorithms. This comparison demonstrated that the BTR has a performance similar to state-of- the-art room-acoustics simulations. To check the ability to simulate refraction, the BTR was compared with a commercial Finite Elements Method (FEM) simulation. In this comparison the BTR simulated the focusing of the ultrasound with an acoustic lens, with good accuracy and excellent performance.

An explicit time-domain FEM for acoustic simulation in rooms with frequency-dependent impedance boundary: Comparison of performance in 2D simulation with frequency-domain FEM

2021 ◽  
Vol 263 (5) ◽  
pp. 1120-1129
Author(s):  
Takumi Yoshida ◽  
Takeshi Okuzono ◽  
Yui Sugimoto ◽  
Kimihiro Sakagami
Keyword(s):  
Frequency Domain ◽  
Fourth Order ◽  
Time Domain ◽  
Sound Propagation ◽  
Room Acoustics ◽  
Absorbing Boundary ◽  
Frequency Dependent ◽  
Impedance Boundary ◽  
Acoustic Simulation ◽  
2D Simulation

Accurate boundary modelings that address the frequency-dependent sound absorption characteristics of various sound absorbers are crucial for wave-based room acoustic simulation. In time-domain simulations, however, a computationally demanding convolution appears in frequency-dependent impedance boundary conditions. The present paper proposes a room acoustic solver with a fourth-order accurate explicit TD-FEM, incorporating a frequency-dependent absorbing boundary condition efficiently using a recursive convolution method, namely the auxiliary differential equation (ADE) method. Its performance against the fourth-order accurate frequency-domain FEM is examined via 2D real-scale room acoustic problems, solving a sound propagation in an office room up to 4.5 kHz. Firstly, we describe briefly the formulation of the proposed room acoustics solver based on the explicit TD-FEM. Then, the discretization error property of the proposed method is evaluated via an impedance tube problem, including a frequency-dependent impedance boundary of porous sound absorber. Finally, the accuracy and efficiency of the proposed method are demonstrated with the comparison of frequency-domain FEM solver, which uses a sparse direct solver for the solution of the linear system at each frequency. Results showed the proposed method can perform an acoustic simulation with significantly low computational costs compared to the frequency-domain solver while keeping an acceptable level of accuracy.

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