Research on the Simulation Method for Equivalent Stiffness of Bolted Connection Thin Plate Structures

Table 5

Nonlinear parameters of bolted beam structures under different excitation forces and bolt preloads.

Bolt preloads (KN)	Excitation force (N)	First-order peak frequency (Hz)	Displacement amplitude (m)	Damping coefficient C (Ns/m)	Cubic item stiffness (N/m^3)
1	10	20.921	0.01516	0.0414
	12.5	20.914	0.02384	0.0329
	15	20.907	0.02701	0.0348
2.5	10	20.816	0.01338	0.0476
	12.5	20.807	0.02223	0.0355
	15	20.798	0.03323	0.0285
5	10	20.763	0.01425	0.0448
	12.5	20.755	0.02138	0.0373
	15	20.747	0.03325	0.0288
10	10	20.526	0.02157	0.0396
	12.5	20.520	0.02837	0.0281
	15	20.514	0.03333	0.0287