The Study Of Astronomical Navigation Simulation Teaching System

This degree thesis of Engineering Master is based on two studies,including the item of"Study on the friction characteristics of automatic transmission fluid(ATF)" and the item of "Study on test method of simulated SAEâ„–2 tester",which belongs to PetroChina Lubricant Company.The Author is an important participator of the former and responsible for the latter.To meet the requirement of new type ATF project carried out by PetroChina DaLian Lube Oil R&D Institute,we develop mimic SAEâ„–2 tester and carry out a study on repeatability and correlation,and use mimic SAEâ„–2 tester to evaluate the friction characteristics of base oil and additives in ATF.The following are the main conclusions.1.The existing bench assessments are not suitable for evaluation of the friction characteristics of ATF.Falex tester,Timken tester,the developed DGN friction and wear tester and small clutch friction tester can not carry out the evaluation of the friction characteristics of ATF.2.Based on the previous factors,including method of run,working conditions,the size of friction ship and steel ship,the material of friction chip and steel chip,the loading method of test element and so on,we copied and improved the SAEâ„–2 tester in laboratory,making it can execute more flexible test.By comparing test,the repeatability of the mimic SAEâ„–2 tester and the relevance of it to SAEâ„–2 tester have been tested and verified,that it can meet the requirements of evaluation of the ATF characteristics of friction.3.We studied the friction characteristics of ATF by the mimic SAEâ„–2 tester,the result showed the content of saturated hydrocarbon in base oil decide its friction durability.The higher content of saturated hydrocarbons in base oil,the better durability it will own.the minute quantities of sulfur compounds in the base oil may be impacted on its frictional characteristic at high temperature,similarity to the sulphurous base oil, the dispersant with sulfur also could have impact on the base oil's high temperature frictional characteristic.At the same time,the dispersant which have high calcium content could improve the friction durability;the dispersant own good temperature frictional characteristic,and the dispersant which have a definite amount of compound of phosphorus and boron could keep a higher level in mid-torque,it conform to the requirement of the frictional characteristic of ATF,including temperature stability and durability.By the compound experiment of dispersant,we found that the mid-torque has additive property.The additives except antirust,for instance antioxidant,antiwear additive,metallic passivator etc.have negative impact on the frictional characteristic of base oil.The results indicate mimic SAEâ„–2 tester developed by us can meet the requirement of developing new ATF.