A New Method for Detecting the Time-Varying Nonlinear Damping in Nonlinear Oscillation Systems: Nonparametric Identification

Table 1

Three test cases.

Case	𝜆(𝑡)
1	0.1(1+𝑒^−0.25(𝑡−7)2)
2	0.1(1+0.5sin(𝑡))
3	0.1(1+0.5sin(2𝜋𝑡))𝑒^−0.1(𝑡−10)2