| The efficiency and energy loss of construction machinery contact the soil-engaging surface shape of their working parts. The soil-engaging surface design level of working parts directly affects the drag reduction energy performance of construction machinery. In order to optimize the shape of the soil-engaging surface and improve the soil-engaging surface design level, thereby reducing working resistance and energy consumption of construction machinery, this study explores the relationship between the intrinsic geometric properties and working resistance characteristics of the soil-engaging surface of construction machinery working parts. This article selects the bulldozing plate surface to explore the relationship between the two.Make mathematical modeling for bulldozing plate model tested in the soil bin by pre-investigator. Map the parabolic and bionic bulldozing plate model with the cutting angle of50°,55°and60°; and establish parametric equations of the six surfaces. In order to strengthen the theoretical comparative, increase the parametric equation of flat surface bulldozing plate with the cutting angle of90°. Calculate the first base quantity E, F&G and the second base quantity L, M&N of the seven surfaces. Researching working resistance and function E&L of bulldozing plates, it is found that there is an optimum variation range of E&L value to make the bulldozing plate at least working resistance. Bulldozing plates with55°cutting angle have an excellent E&L value and the least working resistance.For further study, design bulldozing plates with55°cutting angle of parabolic surface, circular surface, bionic surface, cycloidal surface, involute A surface and involute B surface. Meanwhile, design the flat surface bulldozing plate with the cutting angle of90°. Make mathematical modeling for seven kinds surfaces of bulldozing plates and establish parametric equations of the seven surfaces. For farther study of the surface geometrical properties, add the principal curvature κn as the research object, which reflects significant flexural properties of surface. Calculate the first base quantity E, F&G, the second base quantity L, M&N and the principal curvature along the alignment direction κn of the seven surfaces.Make three-dimensional modeling for seven bulldozing plates by UG; and make three-dimensional modeling for seven solid models of the bulldozing plate cutting the soil. Import seven solid models of the bulldozing plate cutting the soil into ANSYS/LS-DYNA for preprocessor. Then submit them to LS-DYNA solver for solving, as finite element analysis.After solving, submit the simulation results to LS-PREPOST for general post-processing analysis. Make the stress, strain diagrams on bulldozing plate forward direction, vertical direction and bulldozing plate-soil longitudinal section. Record stress and strain data, and make a line chart. Analyze the corresponding soil stress and strain characteristics of different bulldozing plates, in order to evaluate the performance of bulldozing plates.Submit the simulation results to LS-PREPOST for time history post-processing analysis. Draw physical quantity curves as velocity, acceleration, energy consumption on bulldozing plate forward direction, vertical direction and the overall space of bulldozing plate-soil system, bulldozing plate and soil. Analyze the variation of above parameters to research dynamics features of different bulldozing plates.Make function image on the first base quantity E, the second base quantity L and the principal curvature along the alignment direction κn of seven different bulldozing plate surfaces. And analyze bulldozing plate mechanical properties of simulation in contact with geometric characteristics of soil-engaging surface. |
