Some non linear dynamic equations with second and third degree variables are discussed, subharmonic orbits, heteroclinic orbits are obtained, and the conditions for chaos to occur are presented.

• 通过对含二次和三次非线性项动力方程的讨论,得到了系统的次谐轨道和异宿轨道等,给出了系统出现混沌的条件。