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The three-dimensional solid model of the chassis which is the support structure for the wheeled robot's load and power parts is established. Based on the theory of elasticity, the relation equations of the three direction stress and strain of the chassis structure are given. The calculation analysis and simulation are completed by the finite element method, and the structural stress and strain of the chassis under loads and driving forces are obtained. Through simulating and analyzing the stress, strain and deformation values and distribution on the chassis structure, it makes a basis for the design and research of the chassis with light weighted and appropriate stress and deformation. more...

DC magnetic biasing problem,caused by the DC grounding electrode, threatened the safe operation of AC power grid. In this paper, the characteristics of the soil stratification near DC grounding electrode was researched. The AC-DC interconnected large-scale system model under the monopole operation mode was established. The earth surface potential and DC current distribution in various stations under the different surface thickness was calculated. Some useful conclusions are drawn from the analyzed results. more...