Design of the cam profile for piston cam engine;

The thesis considers the five cylinders Cam Piston Engine as a shafting system, it is composed of three simple substructures, cylinder block&outside axis substructure, cam&inside axis substructure, and piston substructure, based on a deep learning of the engine s feature of structure and working principle.

The model of virtual prototype of Cam Piston Engine Key Parts was set up by using Solidworks and ADAMS software.

The powerplant of propeller aircraft is composed of two main parts, piston engine and propeller.

The fracture failure of the piston engine exhaust pipe was analyzed from welding structure defects, welding structure defects and working environment etc.

The field inspection,fracture analysis and statics analysis were performed for a UAV piston engine exhaust nozzle with fracture failure.

The torpedo cylindrical cam motor with inclining rollers was studied.

Operating conditions of cam and roller tribo-pair has important influence on the operation of the torpedo cylindrical cam motor with inclining rollers.

Based on the virtual prototype technology and 3-dimension modeling software UG,the correlatively parameterized modeling and assembling for torpedo cam engine are developed using the top-down design idea to transmit the key parameters modified in the top control system to the detailed parts,thus to update the assembled model with the correlative parameters.

In order to further study the operational mechanism of torpedo cam engine with inclining rollers, this paper presents a method of calculating the parameters of the contact point between the cam and the roller, and preliminarily analyses the loading condition between the roller and the cam.

To evaluate the performance of cam engine with the counter-position placement,such a thermodynamic model based on the kinematic and dynamic analysis is developed and the corresponding program with the Runge-Kutta method is established.