Development Of The Two-disc Testing Rig And Performance Test

In the air power transmission system, the value of the―dn‖of the precisionbearings has exceeded3×106(mm r/min), the consequent complex conditions of hightemperature, high pressure, high shear rate, in this condition, the rheological behavior ofthe lubricating materials need to be studied. The shear rate of the lubricating oil canreach more than104/s, but the present general rheometer is commonly less than103/s,and without heating. Therefore, this paper is mainly based on the principle of rotatingliquid lubricant rheological testing, to establish and improve the testing platform, whichcovered high temperature, high shear and high pressure, to test the rheological behaviorof the lubricant and the traction coefficient for the development of synthetic lubricantslubrication under harsh conditions to provide a basis for performance analysis.This paper discussed the judgment method of the status of EHL. A variety ofrheological models were discussed and were compared. The typical EHL drag curvewere also discussed. Finally, the paper elaborated the generation of the traction andcalculations of the traction.This paper determined the performance index of the two-disc testing rig, and madesure the design of the test machine mechanical system based on the performance indexof the machine. The structure of the testing rig had been designed and the3D softwarehad been used to establish a three-dimensional modeling of mechanical testing machineparts.The ANSYS Workbench had been used to analyzed the static analysis of thespindle, concluded the stress, strain and deformation under the action of the maximumload. The modal analysis was carried on the spindle, and the first6natural frequenciesand mode shapes of the spindle were calculated. It is much greater than the frequencycorresponding to the maximum speed of the spindle, therefore, the design caneffectively avoid the resonance region to ensure the normal operation.The major components of the testing rig were designed. The major components ofthe testing rig include of the two discs, the power systems, the loading systems, the fueland oil return systems and the signal acquisition systems.The testing rig was assembled and debugged, and its testing and control systemwas tested. The testing rig can achieve the designed performance index. The tractioncoefficient of aviation lubricating oil (4050) was tested under the contact pressure of1.2GPa, at the rolling speed of15m/s and at room temperature and compared with thatby empirical formula, the principal reason for the testing rig error is that fully completelubrication is not formed between rollers.