Theoretical and Numerical Studies on Damped Nonlinear Vibration of Orthotropic Saddle Membrane Structures Excited by Hailstone Impact Load

Table 5

Frequencies (rad/s) under different pretensions and time instants.

Order	Time (s)	Pretension (N/m)
		1000	2000	3000	4000
1st order	0.000	653.370	690.417	725.732	759.517
	0.005	651.026	688.436	724.029	758.034
	0.010	649.307	686.983	722.781	756.947
	0.050	644.972	683.319	719.633	754.205
	0.100	644.594	682.999	719.358	753.965
		644.576	682.984	719.345	753.954
2nd order	0.000	785.375	816.955	847.390	876.795
	0.005	784.506	816.183	846.699	876.171
	0.010	783.869	815.617	846.192	875.714
	0.050	782.262	814.190	844.914	874.561
	0.100	782.122	814.066	844.803	874.460
		782.115	814.060	844.797	874.455
3rd order	0.000	858.477	948.671	1032.55	1110.97
	0.005	849.685	942.243	1027.60	1107.02
	0.010	843.237	937.528	1023.97	1104.12
	0.050	826.978	925.641	1014.82	1096.81
	0.100	825.559	924.603	1014.02	1096.17
		825.492	924.554	1013.98	1096.14