Based on the octagonal truss, a new lightweight lattice impeller (L-impeller) is designed. The 3D printing process of the design impeller is simulated by Finite Element Method (FEM). The machinability and simulation feasibility of the design impeller are verified by SLM280 Metal 3D printer. The printing process of L-impeller and solid impeller (S-impeller) under different power is analyzed and compared. The results show the maximum residual deformation of L-impeller is 20.19% smaller than that of S-impeller, and the maximum residual stress is 10.69% smaller than that of L-impeller, which means that the L-impeller will have better printing performance.
Abstract A design method of centrosymmetric lattice structure is proposed. The centrosymmetric lattice is applied to the lightweight design of concentric cylindrical structures. Combining homogenization method and finite element method, the advantage of centrosymmetric lattice concentric cylinder in reducing the maximum stress is verified, and the stress distribution of centrosymmetric lattice concentric cylinder is more uniform along the circumference; two kinds of centrosymmetric lattice solids are selected, and the parametric method is used to study the influence of three parameters on the static response of a centrosymmetric lattice concentric cylinder under axisymmetric surface pressure.The results show that the maximum stress of the central symmetric concentric cylinder is less than that of the parallel array lattice cylinder under axisymmetric surface pressure;the stress distribution of the cylinder under axisymmetric load is periodic along the circumference, and the stress distribution of the concentric cylinder is more uniform than that of the parallel array lattice while the centrosymmetric lattice is applied to the lightweight design of concentric cylinder; the maximum stress increases with the increase of inside thickness and decreases with the increase of outside thickness; the increase of lattice section size will reduce the stress of outside and lattice of concentric cylinder, while the maximum stress of inside is less affected by the size of lattice section.
A lattice compressor impeller whose stiffness and strength can be adjusted freely between unfilled impeller and solid impeller is designed. After ensuring the better calculation accuracy of Asymptotic Homogenization (AH) method, the static performance of lattice impeller with different cell filling rate is analyzed by AH method. The results show that the stiffness and strength of the lattice impeller are between unfilled impeller and solid impeller. The lattice impeller has better circumferential anti distortion ability and higher working efficiency. At the same time, the smaller axial stress provides strength guarantee for the design of a higher speed compressor impeller.
Abstract In this paper we apply the multilevel augmentation method to solve an ill-posed integral equation via the iterated Lavrentiev regularization. This method leads to fast solutions of discrete iterated Lavrentiev regularization. The convergence rates of the iterated Lavrentiev regularization are achieved by using a certain parameter choice strategy. Finally, numerical experiments are given to illustrate the efficiency of the method.
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