Abstract: Against the impact of strong vibration on the dynamic performance of thrust hydraulic cylinder during the process of Tunnel boring machine(TBM)’s rock break and excavation, the dynamic response of the mathematical model of hydraulic cylinder under the axial foundation vibration is built, and the correctness of the model is experimentally verified. Thrust hydraulic cylinder failure region under different vibration parameters is studied, the pressure fluctuation amplitude is positive linear correlated to vibration amplitude, and maximum when vibration frequency is near to natural frequencies, and can be considered as a constant when increase to 90 Hz. Structure parameters are optimized by response surface methodology. Optimized hydraulic cylinder can withstand vibration amplitude-frequency region wider than 45% before optimization when normally works. The optimization of hydraulic cylinder structural parameters by response surface methodology can provide theoretical basis for the design and selection of TBM thrust hydraulic cylinder.

Key words: dynamic characteristic model, foundation vibration, response surface methodology, thrust hydraulic cylinder