Fig. 11
From: Combined method of identification of free oscillations of perforated riffled plates
The natural oscillation frequency of PVS with row riffles arrangement. (a) pb = 6 mm; (b) pb = 6.4 mm; (c) pb = 6.8 mm. (hole width bh = 3.2 mm; pl = 30 mm; nrb = 19 pcs.; nrl = 21 pcs.; l = 0.1 mm; 1–6 modes of oscillations).
