排序方式: 共有4条查询结果,搜索用时 9 毫秒
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动Hamilten系统,给出了当其一阶Melnikov函数恒等于零时的二阶Melnikov函数的表达式,并由此研究了由该系统的Poincare分支及Hopf分支产生的极限环数目,得到了当二阶Melnikov函数不恒为零时,该系统的极限环个数的最小上界的完整结论。 相似文献
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非自旋航天器混沌姿态运动及其参数开闭环控制 总被引:12,自引:0,他引:12
研究万有引力场中受大气阻力且存在结构内阻尼的非自旋航天器在椭圆轨道上平面天平动的混沌及其参数开闭环控制问题.在建立数学模型的基础上确定出现混沌的必要条件并数值验证混沌的存在性,提出非线性振动系统混沌运动的参数开闭环控制并应用于控制航天器的混沌姿态运动. 相似文献
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B. SAHOO S.PONCET 《应用数学和力学(英文版)》2013,34(12):1465-1480
This investigation deals with the effects of slip, magnetic field, and non- Newtonian flow parameters on the flow and heat transfer of an incompressible, electrically conducting fourth-grade fluid past an infinite porous plate. The heat transfer analysis is carried out for two heating processes. The system of highly non-linear differential equations is solved by the shooting method with the fourth-order Runge-Kutta method for moderate values of the parameters. The effective Broyden technique is adopted in order to improve the initial guesses and to satisfy the boundary conditions at infinity. An exceptional cross-over is obtained in the velocity profile in the presence of slip. The fourth-grade fluid parameter is found to increase the momentum boundary layer thickness, whereas the slip parameter substantially decreases it. Similarly, the non-Newtonian fluid parameters and the slip have opposite effects on the thermal boundary layer thickness. 相似文献
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