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SUMMARYThe paper presents a degree of freedom expanding method for dealing with the connections of 3D isopararnetric solid elements and the degenerated shell elements. By introducing two degrees of freedom to describe the elongation in the normal direction of the shell node linked with solid elements, a series of multipoint constraint equations which provide proper connections of solid and shell nodes are raised. The method gives a complete solution to the problem of connection between 3D isoparametxic solid elements and degenerated shell elements even for the thermal elasto-plastic problem. It can adapt to complex junctions and simplify programming. Numerical examples are also presented to demonstrate the accuracy and feasibility in thermal elasto-plastic analysis.

Mobile tail is an important part of the telescopic belt conveyor. It relies mainly on the hydraulic system to achieve its various functions, while the hydraulic height adjustment system is the basis of its different functions. So the operational principle of hydraulic height adjustment system of mobile tail was analyzed in this paper. Parameters which may affect the dynamic process were analyzed. Software AMESim was used to model and simulate the dynamic process. The velocity and displacement of piston and the pressure of the hydraulic cylinder were calculated by the software. Different pump flow and different heart diameter of one-way valve were used to analyze their influence on dynamic process, which provide a reference to the optimal design of hydraulic system of mobile tail.

Heavy-duty gas turbine is used widely in power generation industry for many advantages. Gas turbine inlet system is an important component of the gas turbine. The work to study the inlet elbow system was less in the past. In fact, structure design of the inlet elbow system has important influence on performance and life of the gas turbine. In this paper, the three-dimensional structural model of gas turbine inlet elbow system is built; the stress field for the inlet elbow system is analyzed by using finite element method (FEM). The maximum stress and distribution characteristics of stress field in the inlet elbow system is computed. It provides a reliable basis for reasonable design and safety evaluation of the inlet elbow system in gas turbine.