Fig. 5
From: Accurate acoustic classification research of visually similar monochrome porcelain fragments
Sound transmission analysis of monochrome porcelain fragments. a Sound transmission and resonance. b Frequency amplitude attenuation curves of sound source and samples L1, Y1, H1 and J1. c The acoustic loss coefficient of sampls and vibration frequency generator. d The changing trend of elastic coefficient of samples. e The relationship between Eli (elastic modulus index) and Δαi (sound loss index) of samples at the three strongest resonance peak frequencies, and that of samples at 20 Hz–20 kHz. f Histograms of water absorption, porosity and bulk density of samples
