octave pass band to filter the road spectrum curve; repeating the procedures above for all test roads to obtain all flat road spectrum curves and drawing the curves in the 8-grade road grading map of a double-log coordinate; and calculating the average values of all spectrum values in each ...
The typical road spectrum generation method comprising the steps of: collecting the roads sectional spatial domain data, road surface after the formation of a cross-sectional space domain curve, Fourier transform into a road spectrum curve; multi-octave band-pass filter curve of the road; for all...
The deviation being closed to one or two decibels; • for each 1/3 octave band, one can note a rather good agreement between calculations and measurements above 500 Hz and particularly when considering the real measured 1/3 octave emission spectrum (red bars, 'intermediate' prediction) in ...
The kurtosis which is a measure for how much the shape of the spectrum around the centre of gravity is different from a Gaussian shape. It is equal to . (v) Band energies and energy densities for the following seven octave based frequency intervals: 0?Hz–200?Hz, 200?Hz–400?Hz, 400?