Tribological Analyses for Safety Sliding Bearings in Response to Emergency such as Eathquake

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It is important to analysis and develop the sliding bearings to certificate safty operation used engin bearigs and rotarinary machin bearings which are used for reguge from harricane & typhoon and for relife of earthquake & tsunami.To investigate dynamic oil film observation in journal sliding bearings experimentally by two high speed video cameras because it is important to make clear boundary conditions in journal bearing used dynamically in engines and turbo machines, more accurate tester of multi-purpose journal bearings was developed, and experimental frictional force and pressure distribution in steady state were measured.For scientific engine analyses, a simultaneous and approximate analyses were proposed for connecting rod big end bearings, for piston pin bearings and for crank shaft main bearings. However, to save computation time for engine bearing analysis, it is better to innovate new iteration methods to introduce solutions of partial differential equations in finite width bearing theory. Some kinds of Runge-Kutta methods were proposed by using variable step methods with inherent algorithm of engine bearings, and the characteristic of variable step's Runge-Kutta methods in engine bearing analyses are clarified.And effects of balance weight on performance such as journal orbits of piston pin boss bearings and small end bearings & big end bearings of connecting rod are small as compared with result of main bearings. The four new approximate analyses considering balance weight were proposed for main bearings and influences of balance weight on main bearings were shown in good agreements of results by simultaneous analysis, and the effects of starbation were discussed.