Abstract: The designed missile can not meet the requirements due to the influence of uncertainty on the overall parameters of modular tactical missile. An optimization design of modular tactical missile is made in consideration of uncertainty. A 38 kg helicopter-borne air-to-ground missile (HBAGM) is taken as a case study in the present paper. The robust design optimization (RDO) theory is applied to solve the problem of insensitive HBAGM weight under both design variable and design parameter uncertainties. A missile RDO model is established, including missile conceptual design, surrogate model and robust optimization. Three uncertain problems which exist in modular HBAGM conceptual design, namely, payload weight and center-of-mass location, velocity characteristic, and flight trajectory, are taken into account in a probabilistic setting. The RDO results show that the HBAGM weight is much less insensitive to the uncertainties with a slight weight penalty, and the constraints are also satisfied with much higher probabilities. Comparison of various schemes suggests that the increases in flight height and terminal cruise velocity reduce the effects of uncertain parameters on HBAGM weight. The constraint probabilities can be significantly improved by increasing the terminal cruise velocity as well as tail fin span, and decreasing the wingspan. Key

Key words: tacticalmissile, conceptualparameter, modularization, robustness, optimizationdesign, uncertainty