Search academic texts

Information × Registration Number 0201U001085, 0197U013915 , R & D reports Title The elaboration of methods for estimation and avoidance of dangerous vibration stress level of rotor machines complex parts and assemblies popup.stage_title Head Matvyeyev Valentyn Volodymyrovych, Registration Date 16-01-2001 Organization Institute for problems of strength NASci of Ukraine popup.description2 A series of investigations has been performed involving the development of methods for assessing and precluding dangerous vibtation stress states of complicated parts of rotor machines and creation of selfbalancing devices. A method has been devised for determining the vibration state parameters for turbomachine bladed assembly. It allows a complete consideration of complex dising and operation features of components, their geometry that often changes in the course of operation, material inhomogeneity, inertia forces, temperature fields and initial stresses in the calculation of vibrations. A technique for analyzing a possible scatter in the level of vibration stresses of turbomachine blade assemblies as cyclically regular systems with a violated symmetry is proposed. A method has been developed for an experimental determination of non-stationary aerodynamic characteristics of blade cascade at arbitrary combinations of linear and angular displacements of a blade profile. A calculation-and-experimental procedure has been developed for determining the stability against flutter of blade assemblies with an alternating distribution of symmetry violation. Prototypes of selfbalancing devices have been designed and fabricated for rotors with both vertical and horizontal rotation axes. Theoretical and experimental justification of their operation has been performed. Laboratory testing of the devices in question revealed a possibility of appreciable reduction of rotor vibration parameters. Product Description popup.authors popup.nrat_date 2020-04-03 Close