تحلیل انشعاب‌ های هم بعد یک و دو از یک مدل شکار- شکارچی گسسته زمان

نویسندگان
1 دانشگاه شهرکرد
2 دانشگاه فسا
چکیده
در این مقاله رفتار دینامیکی یک سیستم شکار و شکارچی گسسته را بررسی می کنیم. ابتدا شرایط لازم و کافی وجود نقاط ثابت از این مدل را بررسی می کنیم. سپس تمامی انشعابات ممکن از هم بعد یک مانند انشعاب تبادل پایداری، ﻓﻠﯿﭗ ﻭ

ﻧﺎیمارک-ﺳﺎﮐﺮ را به کمک نظریه ی منیفلد مرکز و فرم نرمال بررسی می کنیم. در ادامه کلیه ی انشعاب های هم بعد دو از این مدل مانند انشعاب رزونانس های قوی ‎$1:2$‎، ‎$1:3$‎ و ‎$ 1:4 $‎ را بررسی خواهیم کرد. شبیه سازی عددی و روش امتداد عددی نه تنها نتایج تحلیلی ما را تایید می کند بلکه رفتار مدل را در تکرار های بالاتر مانند تکرار های چهارم و هشتم را آشکار می سازد. رفتارهای تناوبی, شبه تناوبی, آشوبی, هم زیستی جاذبه های آشوبی و ... از این مدل در این شبیه سازی نمایان می شود که نشان دهنده ی رفتار غنی مدل است.
کلیدواژه‌ها

عنوان مقاله English

Codimension one and two bifurcation analysis in discrete predator-prey model

نویسندگان English

Javad Alidousti 1
Zohreh Eskandari 2
1 Shahrekord University
2 Fasa University
چکیده English

This paper studies the dynamical behavior of a discrete-time predator-prey analytically and numerically. The conditions and the critical coefficients for the transcritical, flip (period-doubling), and Neimark-Sacker are computed by using the center manifold and normal form technique. Besides, codimension-two bifurcations including strong resonances 1:2, 1:3, and 1:4 have been achieved. The numerical simulation and continuation method, not only confirm our analytical results but also reveals richer dynamics of the model, especially in the higher iteration.

کلیدواژه‌ها English

Flip
transcritical
Neimark -Sacker
Resonance
Stability
Predator-prey model
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