Kazimieras Ragulskis

Analytical, numerical, and experimental investigation of self resonance in vibration excitation systems

Eccentric angular motion transfer mechanisms are analyzed in the paper. The de-balancing mass has an additional degree of freedom in these mechanisms. It was found that certain types of such mechanisms posses interesting nonlinear dynamical features when a self-resonance motion mode occurs. Such self-resonance motion mode takes place when the main driving element rotates with relatively high angular velocity, but low frequency vibrations are generated in the range of fundamental frequency of the system. Analytical, numerical and experimental investigations of nonlinear vibration excitation systems were performed. Such vibration excitation systems have high practical value as there is no necessity for complex vibration control equipment -- the stability of operation is guaranteed by non-linear dynamical interactions. Laser velocity measurement system was used for experimental investigations of the dynamical properties of the system. The results of the investigations validated the results of the theoretical analysis and provide a background for developing new type of dynamical mechanisms.

Investigation of the effect of self-resonance of vibration excitation systems

Eccentric type dis-balance type vibration excitation systems are analyzed in the paper. It is assumed that the dis-balance has an additional degree of freedom. It is shown that resonance vibrations in such systems can occur in the regime of self-resonance which is understood as a mode of motion when the driving shafts angular frequency is high, but the generated vibration frequency is relatively low. Experimental investigations of the effect of self-resonance enabled to define the zones of existence of such motion modes. Such principle of vibration excitation can be successfully exploited in different areas of engineering as it eliminated the necessity of complex and expensive vibration control and stabilization equipment.

Investigation of Self Resonance in Vibration Excitation Systems

Eccentric angular motion transfer mechanisms are analyzed in the paper. The debalancing mass has an additional degree of freedom in these mechanisms. It was found that certain types of such mechanisms posses interesting nonlinear dynamical features when a self-resonance motion mode occurs. Such self-resonance motion mode takes place when the main driving element rotates with relatively high angular velocity, but low frequency vibrations are generated in the range of fundamental frequency of the system. Numerical and experimental investigations of nonlinear vibration excitation systems were performed. Such vibration excitation systems have high practical value as there is no necessity for complex vibration control equipment – the stability of operation is guaranteed by non-linear dynamical interactions. Digital holographic system was used for experimental investigations of the dynamical properties of the system. The results of the investigations validated the results of the theoretical analysis and provide a background for developing new type of dynamical mechanisms.

Analysis of the dynamics of the vibratory tabular valve

Construction of a novel vibratory tabular valve- and its design optimization is presented in the paper. The principle of the system operation is based on the effect of dynamic positioning of a steel ball in a vibrating tube. Theoretical analysis of the stability of this non-linear system is coupled together with the experimental study of an operating valve. Laser holographic interferometry is used for the identification and optimization of working regimes of the system.