Figure 3

Chaotic attractors of system ( 3 ) in 3D spaces with \(\pmb{u_{1} = 0.001}\) , \(\pmb{u_{2} = 0.0002}\) , \(\pmb{q_{1} = 0.19}\) , \(\pmb{q_{2} = 0.21}\) , \(\pmb{\varepsilon_{1} = 0.15}\) , \(\pmb{\varepsilon_{2} = 0.15}\) and the initial state \(\pmb{( x_{1} ( 0 ),x_{2} ( 0 ),w_{1} ( 0 ),w_{2} ( 0 ) ) = ( 3.2,8.5,3.5,2.0 )}\) .