排序方式: 共有28条查询结果,搜索用时 15 毫秒
1.
2.
由于混料试验中的响应变量常受到定性因子的影响,故通常采用分类模型来建模.通过已有的D-最优设计的结论导出A-,R-最优设计的方差函数以及等价条件,并给出实例分析. 相似文献
3.
4.
In this paper, we focus on the construction of structure preserving algorithms for Birkhoffian systems, based on existing symplectic schemes for the Hamiltonian equations. The key of the method is to seek an invertible transformation which drives the Birkhoffian equations reduce to the Hamiltonian equations. When there exists such a transformation,applying the corresponding inverse map to symplectic discretization of the Hamiltonian equations, then resulting difference schemes are verified to be Birkhoffian symplectic for the original Birkhoffian equations. To illustrate the operation process of the method, we construct several desirable algorithms for the linear damped oscillator and the single pendulum with linear dissipation respectively. All of them exhibit excellent numerical behavior, especially in preserving conserved quantities. 相似文献
5.
A new conserved quantity of mechanical systems with differential constraints 总被引:1,自引:0,他引:1 下载免费PDF全文
A new conserved quantity of non-Noether symmetry for the mechanical systems with differential constraints is studied. First, the differential equations of motion of the systems are established. Then, the determining equations and restriction equations of the non-Noether symmetry are obtained and a new conserved quantity is given. Finally, an example is given to illustrate the application of the results. 相似文献
6.
由于混料试验中的响应变量常受到定性因子的影响,故通常采用分类模型来建模.通过已有的D-最优设计的结论导出A-,R-最优设计的方差函数以及等价条件,并给出实例分析. 相似文献
7.
8.
Potential method of integration for solving the equations of mechanical systems 总被引:1,自引:0,他引:1 下载免费PDF全文
This paper is intended to apply a potential method of integration
to solving
the equations of holonomic and nonholonomic systems. For a holonomic
system, the differential
equations of motion can be written as a system of differential equations
of first order and its fundamental partial
differential equation is solved by using the potential method of
integration. For a nonholonomic system,
the equations of the corresponding holonomic system are solved by using
the method and then the restriction of
the nonholonomic constraints on the initial conditions of motion is
added. 相似文献
9.
The Hamilton--Jacobi method for solving ordinary differential equations is presented
in this paper. A system of ordinary differential equations of first order or second
order can be expressed as a Hamilton system under certain conditions. Then the
Hamilton--Jacobi method is used in the integration of the Hamilton system and the
solution of the original ordinary differential equations can be found. Finally, an
example is given to illustrate the application of the result. 相似文献
10.
In this paper, the stability with respect to partial variables for the
Birkhoff system is studied. By transplanting the results of the partial
stability for general systems to the Birkhoff system and constructing a
suitable Liapunov function, the partial stability of the system can be
achieved. Finally, two examples are given to illustrate the application of
the results. 相似文献