Том 48, № 6 (2019)

The ideas and results (fragments) of nonlinear wave mechanics and wave technologies along with the wave machines and facilities implementing them developed by the author and his colleagues, researchers at the Research Center for Nonlinear Wave Mechanics and Technology, Blagonravov Institute of Mechanical Engineering, Russian Academy of Sciences, spelled out by the author at the International Conference “Machines, Technologies, and Materials for Modern Mechanical Engineering” on the occasion of the 80th anniversary of the Blagonravov Institute of Mechanical Engineering are presented here.

The method of coordination of motions of the modules of a relative manipulation mechanism with three degrees of freedom is proposed. The method is based on using the constraint equations of the modules and the generalized coordinates of the mechanism as a whole. The problems of the construction of joint motion of modules implementing the program motion of the point of the output link of one module in the mobile coordinate system of another module were solved.

This article deals with the problem of describing the fields of vibration in string lattices with triangular (centered hexagonal) cells. The problems of this kind have not been adequately studied despite the fact that the required models find application in the dynamic analysis of various machines and structures as well as in crystallography and materials science. Equations of motion are provided. Problems of propagation of sinusoidal waves and induced oscillations under a random broadband force action are considered.

This article examines the procedure of kinematic and power analysis of the two-cleaner shoe system of grain harvesters. The procedure is based on presenting the design model of the drive system by combining standard modular elements of a four-link jointed mechanism and a block of design formulas. The analytical relations of the kinematic and power characteristics to the weight and geometric parameters of the links of the cleaning drive system are derived. The results of examining the two-cleaner shoe system of the grain harvester KZS-218 PALESSE GS12 are presented.

The problems of improving the accuracy of the definition of resistance to corrosive fatigue of the shafts of transmission gears, which operate under the effect of atmospheric precipitation and under variable complex loading (joint cyclical bend and torsion), were considered. According to the results of fatigue tests, the equations of the families of fatigue lines for the probability interval of no-failure P(N) = 50–99.9% were derived. The dependences to determining the coefficients of strength and durability in a wide interval of multicycle fatigue are obtained. The nomogram of these coefficients for a probabilistic estimate of the carrying capacity of the shafts at N = 10⁵–10⁸ cycles is given.

Nanocrystalline and submicrocrystalline titanium are synthesized using the methods of severe plastic deformation by twisting and equal channel angular pressing with subsequent cold rolling. The microhardness, magnetic susceptibility, and electrical resistivity have maximum values in highly strained titanium. Annealing in the temperature range of 673–1123 K leads to restoration and recrystallization manifested in decreases in the microhardness by a factor of 2, in the magnetic susceptibility by 15%, and in the resistivity by 20%.