CAJ | 학술논문

将汽车在极限工况下的转向操作建模为周期转向激励的非线性振动系统的响应,结合打靶法和Floquet理论分析了周期转向的稳定性和分岔行为.应用Poincare映射分析了不同的质心位置和不同的车速对极限工况下汽车转向频率特性的影响.结果表明,汽车周期转向时可能发生鞍结分岔和倍周期分岔,发生鞍结分岔还常伴有跳跃现象;极限工况下汽车的转向频率特性与常规工况有很大的不同,转向频率对汽车的稳定性有显著影响,必须采用非线性分析方法.
장기차재겁한공황하적전향조작건모위주기전향격려적비선성진동계통적향응,결합타파법화Floquet이론분석료주기전향적은정성화분차행위.응용Poincare영사분석료불동적질심위치화불동적차속대겁한공황하기차전향빈솔특성적영향.결과표명,기차주기전향시가능발생안결분차화배주기분차,발생안결분차환상반유도약현상;겁한공황하기차적전향빈솔특성여상규공황유흔대적불동,전향빈솔대기차적은정성유현저영향,필수채용비선성분석방법.
The vehicle steering manoeuver in critical conditions was modeled as the response of a nonlinear vibration system with external periodic steering excitation.The stability and bifurcation behavior of the periodic steering motion were analyzed with shooting method and Floquet theory.By using Poincare mapping, the influences of cg position and vehicle velocity on steering frequency behaviors under critical condition were analyzed.The result shows that (1) saddle-node bifurcation and periodic bifurcation may be found when steering periodically under critical condition and jumping phenomenon often follows saddle-node bifurcation; (2) the steering frequency behavior has large differences under critical condition from that under ordinary condition.The steering frequency affects the vehicle stability significantly under critical condition, so the nonlinear analyzing method is necessary.