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删除1字节 、 2020年11月18日 (三) 23:28
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==Stable, unstable and semi-stable limit cycles==
 
==Stable, unstable and semi-stable limit cycles==
 
稳定、不稳定和半稳定极限环
 
稳定、不稳定和半稳定极限环
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In the case where all the neighboring trajectories approach the limit cycle as time approaches infinity, it is called a ''[[stable manifold|stable]]'' or ''attractive'' limit cycle (ω-limit cycle). If instead, all neighboring trajectories approach it as time approaches negative infinity, then it is an ''unstable'' limit cycle (α-limit cycle). If there is a neighboring trajectory which spirals into the limit cycle as time approaches infinity, and another one which spirals into it as time approaches negative infinity, then it is a ''semi-stable'' limit cycle. There are also limit cycles that are neither stable, unstable nor semi-stable: for instance, a neighboring trajectory may approach the limit cycle from the outside, but the inside of the limit cycle is approached by a family of other cycles (which wouldn't be limit cycles).
 
In the case where all the neighboring trajectories approach the limit cycle as time approaches infinity, it is called a ''[[stable manifold|stable]]'' or ''attractive'' limit cycle (ω-limit cycle). If instead, all neighboring trajectories approach it as time approaches negative infinity, then it is an ''unstable'' limit cycle (α-limit cycle). If there is a neighboring trajectory which spirals into the limit cycle as time approaches infinity, and another one which spirals into it as time approaches negative infinity, then it is a ''semi-stable'' limit cycle. There are also limit cycles that are neither stable, unstable nor semi-stable: for instance, a neighboring trajectory may approach the limit cycle from the outside, but the inside of the limit cycle is approached by a family of other cycles (which wouldn't be limit cycles).
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稳定极限环是吸引子的例子。它们意味着自我维持的振荡: 闭合轨迹描述了系统的完美周期行为,任何来自这个闭合轨迹的微小扰动都会导致系统返回到它,使系统坚持到极限环。
 
稳定极限环是吸引子的例子。它们意味着自我维持的振荡: 闭合轨迹描述了系统的完美周期行为,任何来自这个闭合轨迹的微小扰动都会导致系统返回到它,使系统坚持到极限环。
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==Finding limit cycles==
 
==Finding limit cycles==
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