On the Flexural-Torsional Vibration and Stability of Beams Subjected to Axial Load and End Moment

Table 8

Comparison between the experimental and FEM natural frequencies versus axial load, for an aluminum fixed-fixed beam.

Axial load; (N)	1st nat. freq. (Hz)			2nd nat. freq. (Hz)			3rd nat. freq. (Hz)
	Exp.; [45]	FEM; (5/40)	ANSYS; (5/40)	Exp.; [45]	FEM; (5/40)	ANSYS; (5/40)	Exp.; [45]	FEM; (5/40)	ANSYS; (5/40)
1962	36.0	36.1	36.1	93.1	94.0/94.0	94.1/94.0	177.0	180.3/179.1	180.5/179.5
4022	40.0	40.1	40.1	98.9	99.8/99.9	99.8/99.8	184.0	187.7/185.8	187.7/186.6
6671	44.5	44.6	44.6	106.6	107.4/107.4	107.4/107.4	193.9	196.5/195.5	196.7/196.1
7750	46.4	46.5	46.5	109.6	110.5/110.5	110.6/110.6	197.6	200.9/199.7	201.2/200.0
9810	49.5	49.6	49.6	114.9	115.7/115.6	115.6/115.5	204.4	207.4/205.8	207.4/206.2