نتایج جستجو برای: acoustical method
تعداد نتایج: 1633475 فیلتر نتایج به سال:
Acoustical signals from mechanical systems reveal the operating conditions of mechanical components and thus benefit for machinery condition monitoring and fault diagnosis. However, the acoustical signals directly measured by the sensors in essential are the mixed signals of all the sources, and normally it is very difficult to be used for source identification or operating feature extraction. ...
Some acoustical nonlinear effects in biological media at medical ultrasonic frequencies and intensities were studied experimentally. The imaging method of acoustical nonlinearity parameter, as a basic parameter in nonlinear acoustics, was developed and investigated. Results indicate tidt the difference between normal and diseased tissues in nonlinearity parameter tomography is more sensitive th...
There is a general lack of understanding on the accuracy theoretical and empirical models which can be used to predict acoustical properties unsaturated granular media. It also unclear how well these are suited for parameter inversion in application In this work three popular prediction available commercial software packages, e.g. COMSOL Multiphysics, invert key non-acoustical parameters two ty...
A collocation method with the modified equilibrium on line method (ELM) forimposition of Neumann and Robin boundary conditions is presented for solving the two-dimensionalacoustical problems. In the modified ELM, the governing equations are integrated over the lines onthe Neumann (Robin) boundary instead of the Neumann (Robin) boundary condition equations. Inother words, integration domains are...
This paper reports the results of reproducibility experiments on the interlaboratory characterization of the acoustical properties of three types of consolidated porous media: granulated porous rubber, reticulated foam, and fiberglass. The measurements are conducted in several independent laboratories in Europe and North America. The studied acoustical characteristics are the surface complex ac...
In this investigation, the acoustical impedance of an internal combustion engine is measured and simulated. The measurements are based on the two microphone transfer function method, which is described in the standard ISO/FDIS 10543-2. The method uses the transfer function between two microphones positioned on a waveguide connected to the impedance to be measured. Some improvements are proposed...
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