On the route to strangeness without chaos in the quasiperiodically forced van der Pol oscillator

The non-chaotic strange attractor of a non-autonomous dissipative dynamical system with a two-frequency-quasiperiodic forcing is studied. Following results from T. Kapitaniak [Chaos Solitons & Fractals 1, 67 (1991)], numerical observations are refined and the route from torus to strange non-chaotic attractor is described in detail. Possible misinterpretations of experimental observations are discussed.