Design and optimization of a missile transporter semi-trailer structure

Abstract

Minimizing weight, maximizing strength, and maximizing stiffness are the three main challenges of designing semi-trailer structures. This paper presents the design and optimization process of a lightweight missile transporter semi-trailer chassis. The semi-trailer supports up to 40 tons of payload. The payload consists of three generic missiles with a standard length up to 12.5 m. The stacking of these missiles up-shifted the overall center of gravity. The high center of gravity endangered the safe maneuvering of the semi-trailer. The design process went through several iterations to meet the functional and installation requirements of the payload. A finite element model simulated the structure with respect to the loading conditions. Then, the model was implemented to formulate an optimization problem. The optimization objectives were to minimize the chassis weight and constrain the stress to an acceptable value at the same time while safely supporting the payload. The optimization problem solution successfully achieved a balanced trade-off between structural weight, stiffness, and rigidity. The new optimized design is approximately 12.6% lighter and 10.1% stiffer than the initial design for bending loads.