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Detecting sound waves generated by leaks in buried water distribution pipes
(2017-01-01)
It is common to use guided sound waves to detect leaks or cracks in pipelines. Applications include the nondestructive testing of oil and gas pipelines, which normally takes places at ultrasonic frequencies, as well as the ...
Aplicação da série de Fourier como análise acústica de instrumentos musicais
(Universidade Tecnológica Federal do ParanáToledoBrasilLicenciatura em MatemáticaUTFPR, 2016-11-24)
Music has always been part of the history of humanity, its origin was sensorial and rhythmic. Later, because of a systematic and logical organization of the sounds, the musical notes were invented. For centuries, the study ...
Analysis of wave scattering from non-symmetric discontinuities in one-dimensional wave-guides
(2017-01-01)
Predicting the scattering from waves that are incident on a damaged section of structure is of importance in structural health monitoring and nondestructive testing techniques to detect dam-age. High frequency waves are ...
Laser ultrasonics system for measurement of speed of sound in gases
(2012-06-21)
In this work we developed a setup to measure the speed of sound in gases using a laser ultrasonics system. The mentioned setup is an all optical system composed by a Q-switched Nd:YAG laser to generate the sound waves, and ...
Laser ultrasonics system for measurement of speed of sound in gases
(2012-06-21)
In this work we developed a setup to measure the speed of sound in gases using a laser ultrasonics system. The mentioned setup is an all optical system composed by a Q-switched Nd:YAG laser to generate the sound waves, and ...
Avaliação do desempenho do método do traçado de raios para simulação da acústica de uma sala
(Universidade Tecnológica Federal do ParanáCuritibaBrasilDepartamento Acadêmico de MecânicaEngenharia MecânicaUTFPR, 2015-01-13)
This project proposes to work in the acoustic area, more precisely in the simulation field. Acoustic analysis methods will be addressed, simulation programs and techniques of sound wave measurements. A program made by UNB ...
A method to infer the three Cartesian wavelengths of a mountain wave from three soundings
(American Meteorological Society, 2010-04)
The number of atmospheric sounding techniques and the amount of missions within each of them continue to grow at the present time. The probability of having two or more profiles in a given region and time interval therefore ...