the course of consecutive experiments in this report aimed to a research or introductory identification about mechanical and acoustical properties of maple (acer velutinum) wood. studied factors were included quality factor (due to internal friction), acoustic coefficient, acoustical conversion efficiency as well as the modulus of elasticity (young’s modulus) which they were all accomplished us...

A new numerical method, named the acoustical wave propagator method, is introduced to describe the dynamic characteristics of one-dimensional structures with discontinuities. The acoustical wave propagator is derived and implemented by combining Chebyshev polynomial expansion and fast Fourier transformation. Numerical accuracy of the acoustical wave propagator method is examined and compared wi...

Since the dimensions of many of the objects/surfaces encountered in our daily lives are within an order of magnitude of the wavelength of audible sounds, diffraction is an elementary means of sound propagation. Despite its importance in the real-world, diffraction effects are often overlooked by acoustical modeling methods leading to a degredation in immersion or presence. This paper describes ...

This work investigates the application of photon mapping to model environmental acoustics. The resulting acoustic sonel mapping technique is a MonteCarlo based approach that can be used to model acoustic environments while accounting for diffuse and specular acoustic reflections as well as diffraction effects. This modeling is performed in an efficient manner in contrast to available determinis...

Sonel mapping is a Monte-Carlo-based acoustical modeling technique that approximates the acoustics of an environment while accounting for diffuse and specular reflections as well as diffraction effects. Through the use of a probabilistic Russian roulette strategy to determine the type of interaction between a sound and any objects/surfaces it may encounter, sonel mapping avoids excessively larg...

The acoustical impedance of a component is one of its most important characteristics. It is needed when acoustical simulations using lumped elements or electrical analog circuits are carried out. The calibration procedure for the two microphone transfer function method described in ISO 10534-2 is not sufficiently accurate in most cases. In this paper, a new calibration method for the two microp...