Based on the field and lab measuerement in harvest time, Physical and mechanical properties of fritillaria ussuriensis maxim (FUM) are researched. Geometrical properties of FUM are analyzed using mathematical statistics method, and the variation sections of main index values of two kinds of FUM are obtained. Mechanical properties of FUM outsifting in screen penetrating process are tested by means of friction experiment, the friction coefficient and angle of repose of two kinds of FUM are obtained using mathematical statistics method. Grade sieve machine is designed based on the analysis of mechanophysical properties of FUM. The main parameters are: shape of sieve pore is rectangle, screen diameter is 20mm, sieve pore dimension of upper layer is 13×20mm2, middle layer is 9×18mm2, and under layer is 7×10mm2. By testing of friction coefficient and angle of repose and movement and dynamics analysis of grade sieve, outsifting velocity is 7<<9rad/s and acceleration is 4<a<13m/s2 in screening process.
In this paper, for turning the inner ring groove of a large nuclear cylindrical shell, based on requirements of machining condition, the matching tool assembled are designed. Based on the platform of finite element simulation analysis, the deformation and stress analysis of the tools overall structures are carried out, this provides a theoretical basis for the static strength evaluation of the tools. Through the dynamics modal analysis of the tools, natural frequencies and modal shapes of the tools are obtained, this provides a theoretical basis to evaluate the dynamic characteristics of the tools, in particularly, the resonance characteristics. Through static and dynamic analysis, the reasonableness of structural design of the tools is evaluated theoretically.
In this paper, the passes of 25 # equilateral edge angle iron finishing mill group were designed, which included finished product pass K1, and the intermediate passes K2、K3、K4, also the finite element software ANSYS / LS-DYNA was applied for three passes rolling process simulation to verify the rationality of passes design, and the rolling force curve was simulated. It offers a reference for of 25 # angle iron processing.
The mathematical model was established, the pragram was made to optimize the lengths and angles of each link by means of inner point penalty function method. Involving 12 scheduled points, the track of a certain point on the coupler of a planar four-bar linkage was realized and previewed using Matlab. The optimum program presented here could enhance the design efficiency and insure the design accuracy markedly. By this method the coupler-curve involving more than or less than 12 points could be realized, and more complex multi-linkage could be designed.
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