Free Vibration Analysis of Arbitrary-Shaped Plates Based on the Improved Rayleigh–Ritz Method

Table 4

Natural frequencies of the rectangular plate on different spring stiffness coefficients (Hz).

Mode	= 10^5D	= 10^6D	= 10^7D	= 10^8D	= 10^9D	= 10^5D
1	121.97	122.15	122.17	122.17	122.17	121.97
2	157.75	158.05	158.08	158.09	158.09	157.75
3	221.55	222.10	222.15	222.16	222.16	221.55
4	312.91	313.85	313.95	313.96	313.96	312.91
5	316.46	317.64	317.76	317.77	317.77	316.46
6	351.20	352.73	352.88	352.90	352.90	351.20
7	410.91	413.06	413.27	413.30	413.30	410.91
8	429.83	431.43	431.60	431.61	431.60	429.83
9	496.51	499.59	499.90	499.93	499.93	496.51
10	571.89	574.50	574.76	574.79	574.79	571.89