نتایج جستجو برای: ultrasonic additive manufacturing

تعداد نتایج: 171459  

2013
Rafael M. Duarte Juan M. Mauricio Villanueva Maxwell M. Costa Raimundo C.S. Freire Sebastian Y.C. Catunda Wendell M. Costa

Abstrac t This paper presents a procedure for wind speed measurement using ultrasonic transducers based on short-time Fourier transform (STFT). The measurement of wind speed was performed by estimating the ultrasonic transit-time (ToF). For this purpose the estimated ToF was used the technique of digital signal processing, based on the STFT. The ultrasonic signal detection was performed by sett...

1999
Lahouari Ghouti Chi Hau Chen

In ultrasonic nondestructive evaluation (NDE) of materials, pulse echo measurements are masked by the characteristics of the measuring instruments, the propagation paths taken by the ultrasonic pulses, and are corrupted by additive noise. Deconvolution operation seeks to undo these masking effects and extract the defect impulse response which is essential for identification. In this contributio...

2016

In conjunction with America Makes, the nation’s leading and collaborative partner in additive manufacturing (AM) and 3D printing technology and the Manufacturing Extension Partnership (MEP) of the National Institute of Standards and Technology (NIST), Penn State’s Center for Innovative Materials Processing through Direct Digital Deposition is sending an open invitation to Small to Medium Enterp...

Journal: :Journal of Applied Physics 2017

Journal: :International Journal of Mathematical, Engineering and Management Sciences 2016

Journal: :Advances in Production Engineering & Management 2013

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