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Optical methods of generation and detection of ultrasound wave in thin-wall structures
Trnka, Jan ; Landa, Michal
Double pulse holointerferometry and laser interferometry were used to study guided waves propagation in thin-wall structures. The full-field visualisation of the displacements caused by generated waves was carried out by DPHI with ruby laser like a s ce of light and the source of quided waves in different time after impact. The time history of displacements and velocities was detected noncontactly in the points on the surface by vibrometr Polytec.
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Identification of parameters of mechanical systems with dissipation layer
Pešek, Luděk
The contribution deals with identification of parameters of non-linear reological couplings, which are used for numerical modelling of a dissipation layer. The layer is considered as elastomeric. The methodology for this identification is herein presented and tested on the study case of circular ring on visco-elastic layer cushioning. As a non-linear contribution to the elastic force of this coupling the cubic function was used.
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Buckling of shells by FEM
Krásný, I. ; Leština, J. ; Plešek, Jiří
Methods presented in the paper: non-linear analyses, the results are real stability limits: classical anal., the results are ideal stability limits which must be reduced by coefficients reflecting the differences between the ideal and real stability l
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