In order to accomplish the fan shaft's high-cycle fatigue/low-cycle fatigue (HCF/LCF) complex fatigue experiment under combined loading of axial force

principal torsion

vibration torsion and rotating moment

the sample's boundary conditions was simulated truly without inducing other extra loading. A loading method under these conditions was proposed based on mechanism design skills

hydraulics kills and computer data acquisition technology

meanwhile four kinds of loading control and calibrated system were established

and a fan shaft fatigue experiment device of high bypass ratio turbofan engine was designed. Making use of computer measurement and control systems

this experiment device can achieve the harmonious loading of axial force

principal torsion

vibration torsion and rotating moment by signal extraction

electro-hydraulic servo valve and mechanism system. Result showed that the high circle loading frequency could reach to 9Hz

the precision of low circle fatigue

vibration torsion and 92.75% the rotating moment to be loaded was superior to than ±0.12%

±2% and ±5%

respectively

the maximum error of rotating moment didnt exceed ±9%. This experiment device has well repeatability and linearity.