Analysis of Acoustic Characteristics of Arbitrary Triangular Prism and Quadrangular Prism Acoustic Cavities

Table 4

The first eight natural frequencies (Hz) of quadrangular prism acoustic cavities with different shapes.

Mediums	Shapes	Model sequence
		1	2	3	4	5	6	7	8
Air	Quadrilateral	208.17	235.92	340.00	344.78	396.33	398.66	413.83	464.77
		208.17^a	235.87	339.94	344.76	396.17	398.54	413.67	464.61
	Square	170.00	170.00	240.42	340.00	340.00	340.00	380.13	380.13
		169.99^a	169.99	240.39	339.94	339.94	339.94	380.03	380.03
	Rectangular	85.00	170.00	170.00	190.07	240.42	255.00	306.47	340.00
		85.00^a	169.99	169.99	190.05	240.39	254.98	306.41	339.94
	Rhombus	144.75	226.67	226.67	331.34	340.00	369.53	373.46	392.60
		144.74^a	226.64	226.66	331.25	339.94	369.43	373.39	392.51
	Trapezoidal	164.29	204.61	277.48	340.00	340.90	375.55	377.61	396.82
		164.28^a	204.59	277.44	339.94	340.85	375.43	377.51	396.69
Water	Quadrilateral	906.14	1026.94	1480.00	1500.80	1725.20	1735.36	1801.39	2023.12
		906.06^a	1026.90	1479.80	1500.50	1724.60	1734.80	1800.80	2022.50
	Square	740.00	740.00	1046.52	1480.00	1480.00	1480.00	1654.69	1654.69
		739.97^a	739.97	1046.40	1479.80	1479.80	1479.80	1654.20	1654.20
	Rectangular	370.00	740.00	740.00	827.35	1046.52	1110.00	1334.05	1480.00
		370.00^a	739.97	739.97	827.29	1046.40	1109.90	1333.80	1479.80
	Rhombus	630.09	986.67	986.73	1442.29	1480.00	1608.54	1625.65	1708.09
		630.05^a	986.54	986.65	1441.90	1479.80	1608.10	1625.40	1708.60
	Trapezoidal	715.14	890.64	1207.85	1480.00	1483.93	1634.76	1643.72	1727.32
		715.11^a	890.57	1207.70	1479.80	1483.70	1634.20	1643.30	1726.80

^aResults from finite element software ABAQUS.