id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
fumecheng-10743	Ma, Hongjin	SIMPLIFIED HAMILTONIAN-BASED FREQUENCY-AMPLITUDE FORMULATION FOR NONLINEAR VIBRATION SYSTEMS	2022	11	.pdf	application/pdf	4177	175	63	The frequency formulation is [25] 2 2 2 1 2 2 1 1 2 R R R R = − − ω ω ω (11) We can see that the frequency formulation requires only a simple calculation of two integrals, making it much attractive and promising in the nonlinear vibration theory. cos ( ) 2 2 cos B R t t P B t P B B P B B t P B t = + − − = − + ω ω ω ω ω ω ω (12) 2 2 22 2 2 2 2 2 2 2 22 2 2 2 ( ) sin ( cos ) ( ) 2 2 ( )	cache/fumecheng-10743.pdf	txt/fumecheng-10743.txt