Equivalent friction coefficient measurement apparatus for rolling bearings and method thereof

An equivalent friction coefficient measurement apparatus for a rolling bearing, comprising:

• a machine body, a rotary shafting, a sliding seat, a rotational velocity sensor and a data acquisition/processing/calculation/display system, wherein the rotary shafting comprises a mandrel and two support bearings supporting the mandrel, and the rotary shafting is installed between the machine body and the sliding seat;
• the two support bearings are configured as air-floating spindle assemblies or measured rolling bearings or the air-floating spindle assembly and the measured rolling bearing, wherein the air-floating spindle assembly comprises an air-floating spindle base and an air-floating spindle, and the rotary shafting further comprises the measured rolling bearing when the two support bearings supporting the mandrel are air-floating spindle assemblies;
• the measurement apparatus further comprises a power device and a clutch device, a output shaft of the power device is configured to connect to or separate from a free end of one of the air-floating spindles through the clutch device when the two supporting bearings are air-floating spindle assemblies, or the output shaft of the power device is configured to connect to or separate from the mandrel through the clutch device when the two supporting bearings are measured rolling bearings, or the output shaft of the power device is configured to connect to or separate from the air-floating bearing spindle through the clutch device when the two supporting bearings are the air-floating spindle assembly and the measured rolling bearing;
• the rotational velocity sensor is configured to monitor a angular velocity of gyration of the mandrel;
• the data acquisition/processing/calculation/display system is configured to acquire and process the angular velocity of gyration signal of the mandrel monitored by the rotational velocity sensor, acquire a numerical relationship between the angular velocity of the mandrel and time under a condition of no power, and calculate a numerical relationship between the total kinetic energy of the rotary shafting and time, wherein a derivative with respect to time of the numerical relationship between the total kinetic energy of the rotary shafting and time at a certain moment is a friction power of the measured rolling bearing corresponding to the angular velocity at the certain moment;
• the data acquisition/processing/calculation/display system is configured to calculate and display an equivalent friction torque and the equivalent friction coefficient of the measured rolling bearing according to the relationship between the friction power and the equivalent frictional torque and the equivalent friction coefficient.