查询词典 jacobian matrix

The main content of this paper is to research dynamic behavior and stability of nonlinear rotorbearing system, study the numerical methods that is used to this kind of system, solve oil film forces and its Jacobian matrix at any moment, in order to offer basis for project design.

本文主要研究非线性转子—轴承系统的动力学行为和稳定性，研究用于该类系统非线性动力特性的数值方法，求解任一时刻轴承油膜力及其雅可比矩阵，为工程设计提供依据。

Oil film forces and its Jacobian matrix at any moment of sliding bearing with finite length is determined using finite element method based on the variational inequalities principle.

根据不等式变分原理，采用有限元离散化方法，求解有限长径向滑动轴承任一时刻的油膜力及相应的Jacobi矩阵。

The unbalance forces due to the lumped eccentric mass are treated as general forces. Meanwhile, the potential energy expression about gravity based on finite element method is presented for convenience. Based on the variational inequalities principle, the finite element is used to determine the film forces produced by fluid film bearing and damper at any moment and its Jacobian matrix with respect to location and velocity of journal and bearing house.

在第二部分中，主要应用有限元方法及Hamilton原理对所研究系统进行了建模分析，着重对质量偏心问题进行了分析处理，并对此提出了两种处理方法：一、转化为对系统动能的影响；二、将其产生的离心惯性力视为非保守的广义力，并对其表达式进行了推导，同时为分析问题方便，基于有限元离散化方法，推导了重力的势能表达式。

The fluid film bearing-flexible rotor nonlinear system with squeeze film damper is modeled practically using the finite element method and the Hamilton principle.(3) The film forces produced by fluid film bearing and squeeze film damper are determined by finite element method at any moment, and the Jacobian matrix is also determined.(4) A method for analyzing the dynamics of a large system with local nonlinearities is presented. The stability and bifurcation of the equilibrium position and the unbalance responce of a fluid film bearing-flexible rotor system with squeeze film damper are investigated based on the assumption of an incompressible lubricant together with the long bearing approximation for fluid film bearing, short bearing approximation for squeeze film damper and the"π"film cavitation model.

主要研究内容包括下面几个方面：（1）对挤压油膜阻尼器-滑动轴承-转子非线性动力系统中的非线性现象进行了机理方面的研究；（2）应用有限元方法及Hamilton原理对复杂的挤压油膜阻尼器-滑动轴承-转子非线性动力系统进行了建模分析；（3）对滑动轴承及挤压油膜阻尼器中任一时刻的油膜力及相应的Ja-cobi矩阵的确定进行了分析；（4）对一类具有局部非线性的多自由度动力系统，提出了一种可以有效地分析其动力特性的方法；（5）采用实验与理论分析相结合的方法，对挤压油膜阻尼器-滑动轴承-转子非线性动力系统的动力特性进行了分析。

In comparison with the HD measured configuration, it can't make full use of all poles. It takes much longer time to inverse only several sounding points, and in the calculation of partial derivatives Jacobian matrix.

与高密度电阻率法测量装置对比，其对电极的利用率较低，仅几个电测深点的反演就需要很长的时间。

The impact of transfer contracts on node voltages is evaluated according to base-case Jacobian matrix and the partial derivatives of ...

定义flowgate为线路热极限和线路故障2种情况，分别计算基态潮流和考虑线路紧急故障情况下的区域间ATC值，并与线性分布因子法和重复潮流法计算结果相比较。IEEE30节点系统计算结果表明，该算法快速准确，满足在线计算和分析要求。

It is proved that -1 couldnt be the eigenvalue of Jacobian matrix of Poincare map at .fixed point by the analysis of the symmetry of.

对于单自由度双面碰撞振子，通过分析Poincare映射的对称性，证明了不动点不存在-1的特征根。

In this thesis, various conventional and ill-conditioned load flow calculation methods have been fully analyzed and evaluated in the aspect of convergence, and the relationship between the convergence and the Jacobian matrix of polar type load flow equation has been discussed and evaluated.

本文对常规潮流算法和常用病态潮流计算方法进行了全面的算法、收敛性分析、评价、比较。

The Predictor Corrector Primary Dual Interior Point Method is used to solve the OPF model. The effectiveness of load shedding is confirmed using the Q-V mode analysis method, which can be applied to compute eigenvalues of a reduced Jacobian matrix. The numerical results of 2 IEEE standard test systems demonstrate that the proposed OPF model is very effective since it automatically identifies the weak buses and circuits and calculates minimum load shedding.

论文采用了预测-校正原对偶内点法求解该模型，并通过Q-V模态分析研究切负荷前后系统降阶雅可比矩阵的特征值变化情况，评估切负荷控制措施的有效性。2个IEEE标准试验系统的仿真结果表明，该模型直接针对系统薄弱环节，自动辩识切负荷节点和最小切负荷量，具有很好的效果。

During calculation of the tangent vector, the complete Jacobian matrix is adopted so that the tangent vector is computed accurately. During calculation of initial power flow and correction steps FDCPF is used.

该方法在切向量求取环节，采用完整的雅可比矩阵做系数矩阵求取切向量，从而保证切向量的准确性；在初始潮流计算和校正环节采用快速分解法进行求解。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。