Eguations of mathematical model. Criteria of durability. Composite materials. Beams, plats and shells. Finite element method. Types of elements, approximation. Fibres and matrixes. Object-model-shema of calculation. Calculation of constrution. Types of tasks: statics, dynamics, linear, nonlinear, thremoelasticity. Complex: ALGOR, COSMOS, ANSYS, RASMA-durability, stiffness, stablity. Modelling and analysis of kinematic of mechanisms with changeable structure.