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IssuesArchive of Issues2007-6pp.841-841

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"Gennadii Grigoríevich Denisov: On the occasion of his eightieth birthday," Mech. Solids. 42 (6), 841-841 (2007)
Year 2007 Volume 42 Number 6 Pages 841-841
Title Gennadii Grigoríevich Denisov: On the occasion of his eightieth birthday
Abstract Gennadii Grigor'evich Denisov, Doctor of Physical and Mathematical Sciences, Professor, Head of Department at the Scientific Research Institute for Applied Mathematics and Cybernetics at Lobachevskii Nizhnii Novgorod State University, member of the National Committee in Theoretical and Applied Mechanics, celebrated his eightieth birthday on February 6, 2007.

Denisov is one of the most brilliant mechanicists in our country. He is known for his studies in applied and theoretical gyroscopy and dynamics of rigid bodies and mechanical systems with distributed parameters. His work is characterized by originality and novelty of the considered problems, discovery of qualitatively new phenomena lying beyond the framework of traditional concepts, and extraordinary clearness and accuracy of research. Denisov has always been interested in experiments and practically oriented problems. Under his supervision, research on contactless suspension of bodies in magnetic fields has been carried out for a long time. Magnetic suspensions were constructed for the following precision devices: free gyro, gyrocompass, anisotropy meter, rotational hysteresis meter, ultracentrifuge, vacuum pump, and gradiometer (which measures the Earth magnetic field inhomogeneity). These suspensions were used to manufacture prototypes of instruments with unique parameters and unprecedented accuracy. Theoretical and experimental studies of the magnetic suspension have led to the discovery of the autorotation phenomenon (where the rotor is rotated by the suspension itself), double rotation (where the motion of a rotor in a contactless suspension is the superposition of slow rotation about the dynamic symmetry axis and fast rotation about a perpendicular axis; this reduces detrimental moments badly affecting the device accuracy), and rotor roll (which is very dangerous in contactless suspensions and sliding bearings and leads to loads destroying the machine or the device). Denisov carried out very important studies of problems concerning rotational motions of a rigid body in fields of various physical nature. He also performed fundamental studies of rotational motions of a rigid body in a resisting medium and the phenomenon of destabilization of mechanical systems by friction. Denisov gave a convincing solution of the problem as to whether waves propagating in continua have momentum; this problem had been discussed in the literature for several decades. In the cycle of papers about free rotational motions of viscoelastic bodies, he revealed that their dynamics is significantly more complicated than that of absolutely rigid bodies; he also showed the possibility of fast stability change of the stationary rotation axis as the angular velocity varies and gave a new interpretation of the Chandler nutation and the Earth polar motion. Denisov proposed a simple mechanical model for explaining long-period variations in the Earth rotation velocity.

G. G. Denisov is characterized by call of duty and high honesty, understanding and deep interest in people, and amicability. He is very generous to his students and colleagues.

The students and colleagues heartily congratulate Gennadii Grigor'evich Denisov and wish him strong health and many new creative achievements in his activities.
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