| Abstract [eng] |
In this paperwork the strength calculation and optimization of special holder which is used to connect chassis with hydraulic lift is performed. The research consists of four parts, where the strength calculations and optimizations are provided. In the first part of this work the impact place of loading influence to lifting mechanism underframe is determined. As much as power is put away from the platform zone center, the reactions in the hinges are growing. In the second part the largest reactions and most dangerous moments of time are found. Changes of three hinges reactions are determined, when tail lift is lifting the biggest load and it is in the most dangerous place. These reactions are investigating when tail lift is lifting platform from the lowest point (ground) to highest position. Investigated that the maximum reaction comes 0s (starting elevation), 3,6 s ; 5,52 s and 10 s. Considering that platform from the lowest point will be held to the highest in 10 s. In the third part the strength of tail lift special holder is investigating. Also, the topology (there are added or removed additional elements near the retainer) and geometry optimization is done. The strength of special holder was investigated using the method of finite element. During the optimization, the method of scanning was used. The function of objective is to minimize the weight of holder. Restrictions of optimization: tensions according to von Mises criterion did not exceed 254 MPa, contact tensions – 1016 MPa. Variables of optimization without topological elements are sheet thickness, internal bending radius, relief hole diameters and other. The mass of final holder in compare to the first option decreased 20 %. |
