Research On The Piston Ring- Liner Friction And Lubrication Considering The Influence Of Dynamic Responses Of Cylinder Liner And The Solid Particles In The Oil

The friction pair of cylinder liner-piston ring is one of the most important friction pair in the engine, its work performance is good or bad will directly influence the engine performance. While in the recent cylinder liner- piston ring friction lubrication system studies, most researchers propose a hypothesis that the cylinder liner surface is an ideal cylindrical shell for simulation without taking the cylinder dynamic deformation effects on oil film lubrication into consideration. And when taking the analysis of the oil film distribution between cylinder liner- piston ring, lubricating oil often be regarded as a single fluid contains no impurities element. This article preliminary research shows that the lubrication model only taking temperature characteristics effects on oil viscosities into consideration cannot well characterize the influence of solid particles to the cylinder liner- piston ring friction lubricating. Under this circumstance, this paper combines the method of the mathematical model calculation and finite element simulation to study and explore the friction lubrication process of the cylinder liner- piston ring, innovatively coupling the influence of cylinder liner dynamic deformation and oil solid particles on lubricate model. Three different kinds of combustion characteristic alternative fuels, coal diesel(F- T diesel), biological diesel oil and methanol diesel(M15), are been used as controllable liner dynamic response excitation source,and analysis of the combustion process in cylinder of different potential impact on the dynamics of the cylinder liner deformation.In this paper, the piston dynamics model of the piston in the cylinder liner is established, which is considering the impact of the gas pressure and reciprocating inertia force of the piston-cylinder assembly,and calculated to obtain a lateral displacement curve of the piston and the piston force curve sideswipe. On this basis, combined with the finite element analysis software Patran/Nastran to simulate the dynamic response of the cylinder liner by the gas shock and the piston side impact. Dynamic simulation by finite element informed Cylinder Liner in response to excitation mode component dynamic deformation occurred, and further found that the dynamic deformation amplitude is very close to Cylinder Liner- Piston Ring surface roughness of the order, show a direct impact on the formation and distribution of dynamic deformation of the cylinder liner lubricating oil film would be for Liner- Piston Ring lubricant film thickness between calculation and friction characteristics introduces a new factor.Then on the basis of two-dimensional Reynolds equation on average, with asperity contact mode and the Reynolds boundary condition as the foundation to establish the cylinder liner- piston system friction and lubrication behavior and dynamics behavior coupled mathematical model of hydrodynamic pressure lubrication. Which takes into account the coupling effect between the cylinder liner dynamic deformation and Cylinder- film lubrication between piston ring, compared and analyzed with and without cylinder liner deformation under the influence of friction and lubrication properties between the motion pairs. At the same time, in order to study the oil contained in the state of the solid particles of piston ring- liner friction lubricating characteristics and the effect of simplifying the particles affect the performance of the oil to change of viscosity-temperature characteristics, on the basis of the one-dimensional lubrication model, the introduction of solid particle concentration and particle size parameters, forecast analysis between the cylinder liner- piston ring liquid-solid two-phase lubrication condition.Finally on the single-cylinder water-cooled diesel engine has carried out a series of test research, analysis of the alternative fuel combustion characteristic, oil solid particle concentration under different operation conditions on the influence of the cylinder liner- piston ring friction lubricating property. Using continuous wavelet change dynamic deformation related to cylinder liner vibration are analyzed, based on the multi-resolution wavelet analysis to study the envelope of the characteristics of acoustic emission signal associated with the friction process, test analysis between the theoretical predictions and showed highly consistent, friction between internal combustion engine cylinder liner- piston ring lubrication for the future research and industrial practice provides highly directivity theory instruction.