Lightweight Design For Seeker Servo Frame Based On Lattice Structure

Using lattice structure instead of solid material to fill parts is a way for lightweight parts to ensure that parts strength,stiffness and related physical properties unchanged effectively under the premise of a larger weight loss ratio.With combination of mechanical properties and preparation process of the lattice structure,this paper proposes a design method to light part weight based on the filling of lattice structure,Besides in the process of filling the lattice structure to achieve the lightweight parts,the evaluation for lattice structure of mechanical properties and simulation analysis and are focused on.We give out the design scheme of part lightweight based on the dot matrix structure filled.Taking the missile seeker servo frame as the example,the main contents of this paper are described as follows:(1)In order to solve the deficiency of traditional methods,the improved lightweight method based on the filling of lattice structure is proposed.Taking the servomotor frame of the seeker as an example,the concrete implementation scheme is given.(2)According to the working condition of the servomotor frame of the seeker,we analyze the force and modal of the seeker servo frame to obtain vibration modes of each frame.The outer frame of the seeker servo system is optimized by topology to obtain the density gradient of the outer frame,according to the result of force analysis and modal analysis.(3)Selecting the appropriate lattice structure type and optimizing the filling position based on the ease of manufacturing,filling and the density gradients obtained in topology optimization.The homogenization equivalent parameters of lattice structure is obtained based on the material mechanics experiment and analysis of the mechanical properties and failure modes of the selected lattice structure.(4)The post-simulation analysis is proposed through filling equivalent homogeneous material according to the performance of lattice structure into the seeker servo frame.The impact performance and stiffness between lattice-filled frame and solid frame is compared to verify the effect of weight reduction of the servo frame.(5)The impact test of the lightweight frame fabricated by 3D printing is implemented and the results present the correctness of the simulation analysis.The method can guide the lightweight design process of the parts based on the dot matrix structure,shorten the design cycle,reduce the workload and reduce the cost.