Nonlinear System Identification of Folding Fins with Freeplay Using Direct Parameter Estimation

Table 1

Natural frequency estimates and mean square errors.

Measurement points	Natural frequency estimates (Hz)	Mean square errors
No. 1 and no. 2	,	,
No. 1 and no. 3	,	,
No. 1 and no. 4	,	,
No. 1 and no. 5	,	,
No. 1 and no. 6	,	,
No. 2 and no. 3	,	,
No. 2 and no. 4	,	,
No. 2 and no. 5	,	,
No. 2 and no. 6	,	,
No. 3 and no. 4	,	,
No. 3 and no. 5	,	,
No. 3 and no. 6	,	,
No. 4 and no. 5	,	,
No. 4 and no. 6	,	,
No. 5 and no. 6	,	,