Experimental Investigation of Thermal Modal Characteristics for a Ship’s Foundation under 300°C

Table 4

Natural frequency and rate of change at different temperatures of the foundation (unit: Hz).

Measuring point	Order	20°C	100°C	200°C	300°C	Rate of change
1	First order	98.75	98.75	91.25	89.375	0	7.59%	9.49%
	Second order	361.25	358.75	351.875	343.75	0.69%	2.59%	4.84%
2	First order	98.75	98.75	91.25	89.375	0	7.59%	9.49%
	Second order	362.5	358.75	351.875	343.75	−1.03%	2.93%	5.17%
3	First order	98.75	98.75	88.125	89.375	0	10.76%	9.50%
	Second order	321.875	316.875	314.375	308.75	1.55%	2.33%	4.08%
4	First order	98.75	98.75	88.125	89.375	0	10.76%	9.50%
	Second order	/	/	/	342.5	/	/	/