Ref ,

in the
Int. Journ. of Bifurcation and Chaos **9**(6), 1009-1039, (1999),
(IJBC).

See also a Gallery of multispiral Strange Attractors in the modified Chua's dynamical system

See also some multispiral Strange Attractors in some nonautonomous dynamical system

See also some multispiral Strange Attractors in some Brocket type system

See also some multi-buckle Strange Attractors in some Van der pol type system

Kapitaniak [1997] studied the following quasi-periodically forced system which was first proposed by Reich [1961]:

{dx}/{dt} = y-f_2(x), {dy}/{dt} = -beta[x+(v+1)y)+A(sin(omega_1 . t) + sin(\omega_2 . t)],

where x and y are functions of t, f_2 is the Chua's nonlinearity and, beta, A, v, omega_1 and omega_2 are the parameters of the system. In the ref. given above, I modified f_2 to get some new multispiral strange attractors:

left-1-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
right-1-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
Combination of these previous attractors with the formation of a double-one-spiral chaotic attractor. |

left-2-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
right-2-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
Combination of these previous attractors with the formation of a double-two-spiral chaotic attractor. |

left-3-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
right-3-spiral strange attractor exhibited by the modified Reich-Kapitaniak's system |
Combination of these previous attractors with the formation of a double-three-spiral chaotic attractor. |

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