Free Vibration and Hardening Behavior of Truss Core Sandwich Beam

Table 1

Comparison of natural frequencies of the sandwich beam with the first group of parameters.

Mode	Ahmed	Hwu	Lou	Present
1	56	58	57	57.14
2	—	221	219	219.58
3	451	459	465	465.17
4	—	742	767	768.18
5	1073	1048	1105	1106.69