Cieslik J.

The paper presents formulations on structural intensity calculations. Based on bibliography review equations enabled the evaluation of structural surface intensity and involved the loads (forces and moments) and strains (linear and angular). The modelling and computation is done for one and two dimensional structures: beams, plates and shells considered here as simple constructional elements. The numerical method of intensity evaluation was based on complex modal analysis and superposition of modes with use of finite elements method. There are presented results of the calculations which lead to the assessment of distribution of structural intensity vectors on the surface of simply supported rectangular steel plates connected by the different types of joints. The models included the source of vibrations (point and linear force excitation) and sink of energy considered as different configuration of damping elements. The changes of finite elements grid density enabled detailed analysis of total vibration energy flow in analysed plates through the place of joint. Solved problem was intended to show the usability of structure surface intensity method in diagnostics of joints and role of ribs in mechanical constructions specially those typical for the vehicles and other means of transport.