... of the motion effect in the MR pictures of thin layer samples and phantoms scanned by this MRI system. acoustic vibration and noise vibration measurement spectral analysis weak field magnetic resonance imager MRI devices working in a weak magnetic field are used for noninvasive MR scanning...

... is based on a 1:3 scale model of a T-junction with a flexible interlayer. It was used to obtain a significant reduction in the cost of the configurations under study. We chose to carry out vibration measurements by near-field acoustic holography (NAH) in order to avoid the risk of accelerometer...

... mode shapes that were obtained experimentally. 04 06 2010 06 07 2011 13 01 2012 13 01 2012 beams (structures) Doppler measurement impact (mechanical) least squares approximations measurement by laser beam motion measurement vibration measurement vibrations...

... not have the sensitivity to detect all critical flaws. This leads to conservative component designs with more mass than necessary. resonance inspection acoustics finite element modal analysis acoustic resonance finite element analysis modal analysis vibration measurement 26 10...

....2009.07.017 11 03 2009 10 11 2009 22 04 2010 22 04 2010 acoustic wave propagation bending elastic waves honeycomb structures Poisson ratio vibration measurement vibrations Since the end of the 1940s, honeycomb and sandwich structures have seen a widespread use...

... for the first time in literature, and may be used as a benchmark to evaluate other solution methodologies. Some subtleties are discussed about corner support arrangements. 20 01 2009 25 06 2009 14 04 2010 14 04 2010 elasticity Fourier series plates (structures) vibration...

... – 57 . 10.1115/1.2930154 24 11 2008 08 06 2009 18 03 2010 18 03 2010 failure (mechanical) machinery numerical analysis spectral analysis structural acoustics vibration measurement vibrations local mean decomposition empirical mode decomposition health...

... of the interfering vibrations, the bandpass filtered signal will be a mixture of the interfering signal and bearing fault signature. Hence, bandpass filtering cannot bring about any improvement for fault detection. As such, we propose to examine the spectrum of the vibrations measured from the machine at normal...

.... signature extraction wavelet transform bearing diagnosis deconvolution feature extraction Fourier transforms machine bearings vibration measurement wavelet transforms 05 05 2008 07 04 2009 18 06 2009 Illustration of the generalized signal transformation scheme...

... spectral analysers vibration measurement A cyclic symmetric structure of order N consists of N identical substructures S ( i ) , i = 1 , 2 , … , N , each of which spans an angle of 2 π / N . Cyclic symmetric rotors often appear in rotary...

... condition monitoring structural engineering computing support vector machines time series vibration measurement vibrations The extensive literature on structural health monitoring (SHM) has documented the critical importance of detecting damage in aerospace, civil, and mechanical engineering...

... monitoring feature extraction machine testing rolling bearings signal processing vibration measurement empirical mode decomposition intrinsic mode function health diagnosis of rotary machine components rolling bearings Growing demand for high quality production requires that deviation...

...Ben J. Halkon; Steve J. Rothberg Laser Doppler vibrometry is now a well established technique enabling noncontact vibration measurements in the most challenging of environments. Rotor vibration measurements are often highlighted as a major application of laser vibrometers due to their noncontact...

.... Ginsberg. 01 September 2001 01 Dec 2003 30 07 2004 vibration measurement vibrations sensors organic compounds beams (structures) displacement measurement design active noise control attenuators The focus of this research is in part to that of a larger study aimed...

...Yacine M. Amraoui; Nick A. J. Lieven This paper demonstrates a new method of conducting a noncontacting vibration measurement on light structures. Although laser vibrometry provides a routine method of acquiring response data, the method of achieving noncontacting point excitation of structures...

... to channel and dissipate the energy as required. vibration measurement laser velocimetry vibrations steel shear modulus Young's modulus velocity measurement 01 Aug 2001 01 Dec 2001 20 09 2002 Contributed by the Technical Committee on Vibration and Sound for publication...

... are subsequently used to predict dynamic response, avoid resonances, and even monitor structural change that are indicative of incipient failure 1 . vibration measurement turbines automatic testing piezoelectric devices electric sensing devices 01 Feb 2001 01 July 2001 Contributed...

... in the JOURNAL OF VIBRATION AND ACOUSTICS . Manuscript received Nov. 1999; revised Oct. 2000. Associate Editor: J. Q. Sun. 01 Nov 1999 01 Oct 2000 vibration measurement light interferometry Holographic interferometry opened new worlds of research by making possible accurate, global...

... OF VIBRATION AND ACOUSTICS . Manuscript received Oct. 1999; revised Aug. 2000. Associate Editor: M. I. Friswell. 01 Oct 1999 01 Aug 2000 micromechanical devices vibration measurement vibrations dynamic testing measurement by laser beam Modal parameters govern the dynamic...

... analysis vibration measurement Rolling element bearings are widely used as low friction joints between rotating machine components. Since the rotational motion is often a significant function of the overall system, such as wheels on a train, rollers in a paper mill, or a rotor on a helicopter...