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Establish the piston ring-cylinder liner frictional model using the software of GT-Suite combine both of the frictional condition and lubrication, analyze and compute the thickness of oil film between piston ring and cylinder liner, the distribution of oil stress, and the force and power of the friction in rated condition. Then, mainly analyze the thickness of oil film and power of friction at the first piston ring under different temperatures of lubrication oil and different speeds. The results indicate that: The lubrication effect at first piston ring is poor, and the consumption of frictional power is high. The frictional power is significantly reduced with the oil temperature increases. However, the thickness of the oil film will decrease with the oil temperature increases, which is bad to the lubricational condition. Considering both of the lubrication condition and the frictional power, the frictional characteristics are better when the oil temperature is maintained at 80-90°C. With the increase of rotational speed, the oil film thickness and frictional power increase, but comparing with the influence on the frictional power, the change of rotational speed has less influence on the oil film.

Projection pursuit regression is used to make model about the combustion chamber and total sound level of the combustion chamber in order to fit total sound level of An Aircraft Engine. At last the average relative error is small to indicate the model is better, so it is important for aero-engine design and reliability analysis.

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The engine speed characteristic simulation operation interface based on GT-POWER was developed by using VB6.0. VB has the characteristics of simple operation, high efficiency and powerful function. It can realize the background data modification, operation control and calculation result reading and storage of GT-Power model, and draw the engine speed characteristics after finishing the data. curve. Based on ACCESS database, the automatic input and storage of interface input data is realized. The data access, operation control and result reading of GT-POWER model are realized based on VB6.0 programming. The engine is validated by VB6.0 "PictureBox" control. Power, effective torque and effective ratio fuel consumption curve. For the needs of engine speed characteristic simulation, VB6.0 software is used for secondary development of GT-Power, and Chinese operation interface is obtained to simplify the operation process of engine speed characteristic simulation, reduce operation difficulty and improve calculation efficiency, which has certain engineering significance. The simulation method has the advantages of high flexibility, low cost, strong repeatability, and the like, and can obtain parameters that are inconvenient to measure. The results show that the developed engine speed characteristic simulation operation interface can simplify the operation process of engine speed characteristic simulation, reduce the operation difficulty and improve the calculation efficiency.