| The thesis work is based on the projects “Research of the vibration and noisemechanism and reliability on the large-size water lubricated rubber alloy bearing”which had been supported by National Defense Basic Scientific Research Program ofChina and National Natural Science Foundation of China (Grant No.51175521). Due tothe water pollution of river and sea by oil leakage of marine propulsion system isgetting worse, along with the common and key technology issues that need to be solvedurgently of vibration and noise reducing, safe and reliable, and energy and emissionreduction for the marine propulsion system of submarines, aircraft carrier and anechoicsubmarines, the high reliable and low noise water lubricated rubber alloy bearing undercoupling multi-field effect is studied based on the over10technological patents forinvention related to the high efficient transmission system based on the new-typecomposite material of the state key laboratory of mechanical transmission of chongqinguniversity and other relevant research results. The mixed lubricating behavior alongwith the load capacity and failure mechanism, water film dynamic characteristic andfriction and noise mechanism are studied, and some related experiments are conducted,in order to evaluate the influences of lubricating structure with multi-surfaces axialgrooves (including the grooves number, grooves radius and grooves fillet radius), rubberlayer thickness, rubber hardness and elastic modulus, L/D ratio et al on the lubricatingcharacteristic and friction noise of water lubricated rubber alloy bearing. The results layscientific and technological foundation for proposing the creative designing theory,method and technology on high-performance water lubricated rubber alloy bearing andtransmission systems and developing the new sources of environmental protectionindustries and economic growth. The research contents as follows:(1) A mixed lubrication model for water lubricated rubber alloy bearing isconducted considering the effects of lubricating structure with multi-surfaces axialgrooves, elastic deformation, surface roughness and thermal. Meanwhile the numericalsolution is developed according to the actual operation conditions.(2) The distribution of water film pressure, thickness and thermal are studied basedon the mixed lubricated model to evaluate the influences of speed, load, groovesstructure (including the grooves number, grooves radius and grooves fillet radius),rubber elasticity modulus, the bearing clearance and surface roughness on the mixed lubricating performance of water lubricated rubber alloy bearing under couplingmulti-field effect. The results reveal the mixed lubrication action and load capacity andfailure mechanism of water lubricated rubber alloy bearing.(3) The dynamic Reynolds equation considering the rubber deformation andlubricating structure with multi-curve groove based on the unsteady flows has beenderived. And the governing equation of water film dynamic stiffness and damping arepresented. On this basis, the influences of the load, speed, supply pressure, groovegeometry, aspect ratios and the bearing clearance on the water film dynamiccharacteristics are studied. The results will be the theoretical basis of steady analysis ofwater lubricated rubber alloy bearing.(4) The friction noise mechanism of the mechanical tribology system is studied toestablish the dynamic model for water lubricated rubber alloy bearing. And the complexmode of water lubricated rubber alloy bearing are analysed using the finite elementmethod to evaluate the stability and friction noise mechanism of water lubricated rubberalloy bearing. Furthermore, the influences of friction coefficient, speed, load, rubberhardness, grooves number and rubber thickness on the friction noise distribution arestudied to propose the optimal design method of low noise water lubricated rubber alloyrubber bearing.(5) The synthesis experiment platform of water lubricated rubber alloy bearing hasbeen developed aiming to advance the experiment method and condition consideringmulti field coupling issue. It is excellent to do the experiments of friction coefficient,water film pressure, water film thickness, axis trace, dynamic stiffness and damping andvibrating noise et al, considering the different frequency of exciting force, speed, waterenvironment. In addition, the related experiments are done that validate the correct oftheoretical analysis. Therefore, the experiment platform can provide the experimentalconditions for studying the innovative design theory and method of the multi-fieldcoupling water lubricated rubber alloy bearing. |
PDF Full Text Request