研究了广义Pfaff-Birkhoff-d'Alembert原理和广义Birkhoff系统在群的无限小变换下的形式不变性质.给出了形式不变性的判据,并由形式不变性导出Noether守恒量和新型守恒量.
The generalized Pfaff-Birkhoff-d'Alembert principle and the form invariance of the generalized Birkhoff's equations under the infinitesimal transformation of group are studied.The criterion of the form invariance is given and the Noether conserved quantity and a new conserved quantity are obtained by the invariance.