Beam Structure Damage Identification Based on BP Neural Network and Support Vector Machine

Table 1

Common kernel function.

Kernel function	Expression	Parameter
Liner kernel function	𝐾(𝑥𝑖,𝑥𝑗)=𝑥𝑖⋅𝑥𝑗
Polynomial kernel function	𝐾(𝑥𝑖,𝑥𝑗)=𝑥𝑖⋅𝑥𝑗+1^𝑑	𝑑
Radial basis function (RBF) kernel function	𝐾(𝑥𝑖,𝑥𝑗)=exp−𝛾𝑥𝑖−𝑥𝑗^2	𝛾>0
Sigmoid kernel function	𝐾𝑥𝑖,𝑥𝑗=tanh𝑏𝑥𝑖,𝑥𝑗+𝑐	𝑏, 𝑐