Application of optimum design in missile structure

  • Detail

The application of optimization design in missile structural design

1 introduction

its scratch resistance is greatly improved. Structural optimization design is a theory and method to seek the best design for various engineering structural design problems, such as the selection of important structural parameters, parameter matching, structural verification, etc., making full use of the latest achievements of modern mathematics, physics, mechanics and calculation methods. Missile body is an important safety component of missile weapon system. It bears various loads such as impact and aerodynamics, and bears components such as seeker, gyroscope, warhead, engine and steering gear, including not only components sensitive to vibration and impact, but also initiating explosive devices. Therefore, its structural design must be reliable. In the past, the static strength design method was mainly used, but with the continuous improvement of missile performance requirements, the traditional design method can not meet the needs. On the basis of meeting the reliability requirements, how to reduce the mass of missile body structure has become one of the important problems to be solved

structural optimization design includes topology optimization, geometric optimization (shape and position), size optimization and other aspects. It not only reflects the development process of the problems in this field from simple to deep, but also reflects the continuous deepening of the designers' understanding of the problems. Structural optimization has experienced more than 40 years of research and development. At present, the technology of size optimization and geometric optimization has been relatively mature, and has been successfully applied in some industrial fields such as aviation, aerospace, automotive and so on. Topology optimization is still in the early stage of development, and its application is relatively few, but it has become one of the research hotspots in the field of structural optimization in recent years. The optimal structural topology plays a very important role in structural optimization design. In the missile structure design, Solvay is integrated to provide medical equipment manufacturers with the promises, experience and innovative digital design, topology optimization, shape optimization and size optimization technology they need. A series of optimization studies are carried out on the missile structure, and the digital design and optimization process of the missile structure is established. The practical research shows that the design platform method and optimization process can effectively ensure the efficiency and quality of missile structural optimization design

2 traditional tactical missile structure design process and its existing problems

2.1 traditional tactical missile structure design process

traditional structure design includes spacecraft, aircraft, missiles and other structure design model structure design, and the development of its structure design technology mainly takes the test verification as the main path of FEM analysis for analysts. The classical structural design method converts the dynamic load into static load, focuses on static design, takes the test verification as the main basis, and through such a continuous and repeated design process as design, verification and RE modification (as shown in Figure 1). Obviously, this can no longer meet the needs of the development of modern technology. In order to continuously meet the requirements of improving missile performance, the useless dead weight of the structure must be reduced as much as possible on the premise of ensuring the reliability of the test and verification of the structure. Using digital design means, the optimization design concept is incorporated into the design process. Considering the product structure performance and design objectives, the traditional missile structure design process in Figure 1 shows the best product that meets the engineering requirements

Figure 1 traditional missile structure design process

2.2 some problems in the traditional missile structure design process

1) isolation and disconnection between CAD design and CAE analysis. Designers know little about finite element analysis, and analysts don't know much about structural design and manufacturing process. Designers design according to experience, design standards and similar products, while their strength, stiffness, mode and stability analysis need to be transferred to analysts for analysis and calculation. In many cases, analysts only play the role of verification. If they don't meet the requirements, they need to carry out a new round of design

2) the optimization design is mainly carried out after the design is completed. If the scheme cannot meet the performance requirements of the oil viscosity is too large, the optimization is carried out on the basis of its design results. Although it can meet the performance requirements to a certain extent, it is difficult to achieve the optimal scheme. It is mainly for designers to improve based on experience or some information fed back by analysts

3) the traditional design method has low efficiency and long cycle, so it is difficult to achieve a successful design and optimal design

3 missile structure integrated digital design optimization platform and its optimization design process

3.1 missile structure integrated digital design optimization platform

in order to improve design efficiency and quality, shorten design cycle and reduce development cost, it is necessary to optimize and reengineer the missile structure design process, that is, to adopt the integrated design, analysis and Optimization Platform Based on network and PDM system, and apply digital design means, Optimize the structural design process and incorporate the optimization design concept into the whole structural design process. The platform adopts modern digital integration technology and integrates digital design, digital analysis, digital simulation, integrated optimization design and product data management. It can efficiently carry out missile structure design in an integrated environment. The structure of the integrated design platform is shown in Figure 2

3.2 missile structure integrated optimization design process

due to the increasingly high performance requirements of missiles, missile structure design should not only meet the factors of strength, stiffness, stability and so on, but also as a class of aircraft, structural weight is also one of the key factors of concern, and structural design optimization is becoming increasingly important. Therefore, it is necessary to ensure the optimization of design results in the design process. In the conceptual design stage, the load condition, constraint condition and spatial position condition of the structure are considered, and the best force transmission route and material distribution are designed to obtain the best topological structure and the minimum weight. Optimization technology and its design tools are very useful in structural design. Structural optimization can be integrated into the whole missile structural design process, and the schematic diagram of the design process is shown in Figure 3. It can be seen from the figure that the whole design process uses CAD tools UG NX2, CAE analysis tools and optimization design tools. From the beginning of conceptual design to the preliminary design to the end of detailed design, the optimization concept runs through the whole design process

figure 3

4 conclusion

according to the requirements of missile structure design, using digital design means, integrated three-dimensional design, topology optimization, shape optimization and size optimization tools, designed the missile structure integrated digital design and optimization process. The case study shows that the design platform can effectively realize the optimization design of the projectile structure, that is, the topology optimization design is carried out to obtain an optimal force transmission path and weight reduction scheme, and then the shape optimization design is carried out to the obtained results to obtain a more detailed structural state. (end)

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