An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

Table 6

Natural vibration frequency of the specimen.

Work condition	Natural frequency (hz)	Work condition	Natural frequency (hz)	Work condition	Natural frequency (hz)	Work condition	Natural frequency (hz)
1	49.76	26	42.48	46	42.39	66	37.67
8	49.72	28	42.48	48	42.37	68	39.16
10	49.73	30	42.39	50	42.49	70	39.19
12	49.71	32	42.38	52	42.37	72	39.19
14	49.76	34	42.48	54	42.37	74	39.18
16	44.50	36	42.35	56	42.37	76	39.20
18	44.80	38	42.47	58	42.47	78	26.85
20	44.80	40	42.46	60	39.17	80	28.80
22	44.50	42	42.49	62	37.68	82	28.95
24	42.48	44	42.37	64	39.18