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机构地区:[1]扬州大学数学科学学院,江苏扬州225002 [2]泰州师范高等专科学校,江苏泰兴225400
出 处:《扬州大学学报(自然科学版)》2010年第4期13-16,33,共5页Journal of Yangzhou University:Natural Science Edition
基 金:江苏省高校自然科学基金资助项目(08KJB110013)
摘 要:采用MIRONENKO的反射函数法研究了双摆振动系统x′=A(t)x与y′=B(t)y的同相振动性,其中A(t)=(aij(t))2×2,B(t)=(bij(t))2×2.假设F(t),G(t)分别为x′=A(t)x,y′=B(t)y的反射矩阵,当A(t+2ω)=A(t),B(t+2ω)=B(t)时,矩阵F(-ω),G(-ω)分别相似于x′=A(t)x,y′=B(t)y的根本矩阵.若特征方程|λE-F(-ω)|=0与|μE-G(-ω)|=0具有相同的特征根,则x′=A(t)x与y′=B(t)y的稳定性相同.文中给出了特征方程|λE-F(-ω)|=0与|μE-G(-ω)|=0具有相同特征根的充分条件.Using the method of reflective function of Mironenko,this paper studies the nature of the synchronous vibration of the double pendulum system,x′=A(t)x and y′=B(t)y,where A(t)=(aij(t))2×2 and B(t)=(bij(t))2×2 are continuous on R.Suppose that F(t) and G(t) are the reflective matrix of system x′=A(t)x and y′=B(t)y respectively.If A(t+2ω)=A(t),B(t+2ω)=B(t),then F(-ω) and G(-ω) are similar to the monodromy matrix of system x′=A(t)x and y′=B(t)y respectively.If the roots of the characteristic equations |λE-F(-ω)|=0 and |μE-G(-ω)|=0 are equal,then the stability of null solution of x′=A(t)x and y′=B(t)y are the same.The sufficient conditions for the existence of the same roots of equations |λE-F(-ω)|=0 and |μE-G(-ω)|=0 are also given.
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