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This paper presents a numerical algorithm tuning aircraft landing gear control system with three objectives, including reducing relative vibration, reducing hydraulic strut force and controlling energy consumption. Sliding mode control is applied to the vibration control of a simplified landing gear model with uncertainty. A two-stage generalized cell mapping algorithm is applied to search the Pareto set with gradient-free scheme. Drop test simulations over un-even runway show that the vibration and force interaction can be considerably reduced, and the Pareto optimum form a tight range in time domain.