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By phase portraits, Poincar\u00e9 sections and bifurcation diagrams, the rich dynamic behaviors of this system are demonstrated, such as an onion-like strange attractor, pitchfork and attractor merging bifurcations, period-doubling routes to chaos, and chaotic transients in the case of small damping. Moreover, the chaos persists as the damping is reduced to zero.<\/jats:p>","DOI":"10.1142\/s0218127410026642","type":"journal-article","created":{"date-parts":[[2010,5,11]],"date-time":"2010-05-11T06:51:47Z","timestamp":1273560707000},"page":"1499-1507","source":"Crossref","is-referenced-by-count":38,"title":["PERIODICALLY FORCED CHAOTIC SYSTEM WITH SIGNUM NONLINEARITY"],"prefix":"10.1142","volume":"20","author":[{"given":"KEHUI","family":"SUN","sequence":"first","affiliation":[{"name":"School of Physics Science and Technology, Central South University, Changsha 410083, China"},{"name":"Department of Physics, University of Wisconsin Madison, WI 53706, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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