Experimental evaluation of coupling loss factors of thin plates

Using statistical energy analysis method to gain knowledge of coupling loss factors (CLFs) of structural elements of complex mechanical systems is fundamental, therefore the evaluation of CLFs for different constructional connections of thin rectangular plates merits studying. CLFs for different constructional perpendicular connections of thin rectangular plates were investigated. Three types of couplings were studied: line junction, stiff bridges, and point connections. Investigations were realized with method of energy stored at anechoic chamber. Experimental test included two kinds of connections of tested perpendicular plates: welded line junctions and point junctions. Several combinations of thickness ratio on CLFs values were tested for welded plates. Also, the distribution points were studied to show the impact on CLFs. There is evidence of decreasing of CLFs for larger ratios of thickness especially for higher frequency bands. Acoustic power flow across riveted junctions shows up to 20 dB lower tr...