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Statistical Analysis Method
Here is the the chart displaying parametric and non-parametric statistic…
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What is Power Spectral Density (PSD)?
When dealing with signals such as vibration signal, sometimes PSD comes into our attention. PSD was used to measure signal power content/energy variation in the frequency domain and it is measured using complex mathematical calculations and measured as frequency per unit mass. Power This term indicates the magnitude of power spectral density functions in respect…
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What is the interest of measuring seat transmissibility?
Reference : Neil J. Mansfield, Human Response to Vibration, CRC Press 2005
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Python Optional Packages
Matplotlib = for 2D and 3D plotting in the consoles. Pandas = for viewing and editing Series and DataFrames in the Variable Explorer. Numpy = for viewing and editing two or three dimensional arrays in the Variable Explorer. Scipy = 0.7.3 – for working with symbolic mathematics in the IPython console. Cython = to run…
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Root Mean Square level
y = rms(x) y = rms(x,dim)
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Power Spectral Density estimate using PWELCH
pxx = pwelch(x) pxx = pwelch(x,window) pxx = pwelch(x,window,noverlap)pxx = pwelch(x,window,noverlap,nfft) [pxx,w] = pwelch(___) [pxx,f] = pwelch(___,fs) [pxx,w] = pwelch(x,window,noverlap,w) [pxx,f] = pwelch(x,window,noverlap,f,fs) [___] = pwelch(x,window,___,freqrange) [___] = pwelch(x,window,___,trace) [___,pxxc] = pwelch(___,’ConfidenceLevel’,probability) [___] = pwelch(___,spectrumtype) pwelch(___)