Structural Behavior Measurement
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 iranagouda007 Active In SP Posts: 1 Joined: Apr 2010 07-04-2010, 03:23 PM I need the details of the seminar and presentation on the topic as mentioned above.[/size][/font]
 reports-crawler Active In SP Posts: 291 Joined: Apr 2010 11-04-2010, 02:18 PM Structural behavioral Measurements This article concentrates on the measurement of the vibration of mechanical structures and machinery. Spectral Analysis: the most convenient way to analyze a vibration signal is to obtain its frequency spectrum because Resonances are also manifested as peaks in a frequency spectrum. also because Excitation forces (especially in rotating equipment), often provide sinusoidal excitation at specific frequencies. The FFT Analyzer: The FFT computes a discretized (sampled) version of the frequency spectrum of a sampled time signal.Present day FFT analyzers can compute a DFT in milliseconds. Rules of Digital Measurement: Time Waveform:The DFT assumes that the sampled time waveform contains N uniformly spaced waveform samples Frequency Waveform: The DFT assumes that the digital frequency spectrum contains N/2 uniformly spaced samples of complex valued data Nyquist Sampling: Shannonâ„¢s Sampling Theorem says that a frequency spectrum can only contain unique frequencies Zoom Measurements: A Zoom transform is essentially a digital filtering operation that takes place after the time waveform has been sampled and it involves re-sampling, frequency shifting, and low pass filtering of the sampled data. Digital Measurement Difficulties: Aliasing Aliasing of a signal occurs when it is sampled at less than twice the highest frequency in the spectrum of the signal.In FFT it is solved by passing the analog signals through anti-aliasing filters before they are sampled. Leakage: If a time signal is not periodic in the transform window, when it is transformed to the frequency domain, a smearing of its spectrum will occur. This is called leakage. for details , refer this pdf:   Structural Dynamics Measurements.pdf (Size: 481.33 KB / Downloads: 56)   VIBRATION-BASED STRUCTURAL MONITORING.pdf (Size: 496.18 KB / Downloads: 76) Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion