Precision and adaptability of the math model of the system significantly affect validity of power grid stability analysis.

The paper presents voltage stability analysis of radial distribution networks.

The nonlinear influence must be considered in the analysis of stability of concrete filled steel tubular arch bridge in construction.

Through the analysis of stability and survey in fieldwork to pre-solid transform by pileuping the coal in the project of Wenzhou Electric Power Plant (phase 2), engineers harvest a lot of valuable materials and results, put forward the plans to control the transform, which are the reference to the later designs and constructions.

Based on the fold catastrophe and its potential function,combining the measured data of a plate strain meter at the dam heel of the Longtan RCC dam,and taking pressure,temperature and time factors into consideration,the statistical model was established and the analysis of stability was made.

, In order to calculate the buckling load of ‘A’ form derrick and the sensitivities of its elements' many structural parameters, in this paper, the one order and two order sensitivities of many parameters against buckling load are calculated when the several structural parameters of the elements are changed randomly using the random perturbation finite element method of buckling analysis.

On riew of the demand of steel structure buckling analysis,this thesis has derived a new thin-wall element stiffness matrix in 3-D space based on the thin-wall structure theory,with the section warping considered in the process adopting a different shape function for pull, press and bending component.

The displacement variational principle was used to develop the spline finite member element method for buckling analysis of thin walled members with shear lag effect.