摘要 : In this paper we present the variational equations of constrained Birkhoffian systems and study their solution. Itis proven that, under some conditions, a particular solution of variational equations can be obtained by using a fir... 展开 In this paper we present the variational equations of constrained Birkhoffian systems and study their solution. Itis proven that, under some conditions, a particular solution of variational equations can be obtained by using a firstintegral. At the end of the paper, an example is given to illustrate the application of the results. 收起