Abstract:Through the engineering experimental method,the performance of large load capacity air foil bearing was investigated.Through the construction of inverted dynamic pressure bearing experimental system,the takeoff characteristics,bearing ability,coating effect,bearing clearance and start stop life of the designed dynamic pressure bearing used for 132 kW wind turbine were experimentally investigated.A method was proposed to determine the takeoff speed of air foil bearing by using dynamics method,which could determine for the takeoff speed more accurately.The engineering experimental results for the practical manufactured bearing show that the bearings can take off at about 5 000 r/min,and its load capacity is greater than 154 N.The coating posses good friction reducing and antiwear effect,which can satisfy the 10 000 times of start stop requirements.The actual performance of the bearing is the best when the gap is about 03 mm.