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# Volume 24, Number 5, 2019 Sergey Chaplygin Memorial Issue

 Sergey Chaplygin. On the Occasion of his 150th Birthday Abstract Citation: Sergey Chaplygin. On the Occasion of his 150th Birthday, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 447-449 DOI:10.1134/S1560354719050010
 García-Naranjo L. C. Integrability of the $n$-dimensional Axially Symmetric Chaplygin Sphere Abstract We consider the $n$-dimensional Chaplygin sphere under the assumption that the mass distribution of the sphere is axisymmetric. We prove that, for initial conditions whose angular momentum about the contact point is vertical, the dynamics is quasi-periodic. For $n=4$ we perform the reduction by the associated $\mathrm{SO}(3)$ symmetry and show that the reduced system is integrable by the Euler–Jacobi theorem. Keywords: non-holonomic dynamics, integrability, quasi-periodicity, symmetry, singular reduction Citation: García-Naranjo L. C., Integrability of the $n$-dimensional Axially Symmetric Chaplygin Sphere, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 450-463 DOI:10.1134/S1560354719050022
 Adabrah A. K.,  Dragović V.,  Radnović M. Periodic Billiards Within Conics in the Minkowski Plane and Akhiezer Polynomials Abstract We derive necessary and sufficient conditions for periodic and for elliptic periodic trajectories of billiards within an ellipse in the Minkowski plane in terms of an underlining elliptic curve. We provide several examples of periodic and elliptic periodic trajectories with small periods. We observe a relationship between Cayley-type conditions and discriminantly separable and factorizable polynomials. Equivalent conditions for periodicity and elliptic periodicity are derived in terms of polynomial-functional equations as well. The corresponding polynomials are related to the classical extremal polynomials. In particular, the light-like periodic trajectories are related to the classical Chebyshev polynomials. Similarities and differences with respect to the previously studied Euclidean case are highlighted. Keywords: Minkowski plane, relativistic ellipses and hyperbolas, elliptic billiards, periodic and elliptic periodic trajectories, extremal polynomials, Chebyshev polynomials, Akhiezer polynomials, discriminantly separable polynomials Citation: Adabrah A. K.,  Dragović V.,  Radnović M., Periodic Billiards Within Conics in the Minkowski Plane and Akhiezer Polynomials, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 464-501 DOI:10.1134/S1560354719050034
 Markeev A. P. On the Stability of the Regular Precession of an Asymmetric Gyroscope at a Second-order Resonance Abstract The motion of a rigid body about a fixed point in a homogeneous gravitational field is investigated. The body is not dynamically symmetric and its center of gravity lies on the perpendicular, raised from the fixed point, to one of the circular sections of an ellipsoid of inertia. A body with such mass geometry may precess regularly about a nonvertical axis (Grioli’s precession). The problem of the orbital stability of this precession is solved for critical cases of second-order resonance, when terms higher than degree four in the series expansion of the Hamiltonian of the perturbed motion should be taken into account. Keywords: rigid body, precession, stability Citation: Markeev A. P., On the Stability of the Regular Precession of an Asymmetric Gyroscope at a Second-order Resonance, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 502-510 DOI:10.1134/S1560354719050046
 Bustamante M. D.,  Lynch P. Nonholonomic Noetherian Symmetries and Integrals of the Routh Sphere and the Chaplygin Ball Abstract The dynamics of a spherical body with a non-uniform mass distribution rolling on a plane were discussed by Sergey Chaplygin, whose 150th birthday we celebrate this year. The Chaplygin top is a non-integrable system, with a colourful range of interesting motions. A special case of this system was studied by Edward Routh, who showed that it is integrable. The Routh sphere has a centre of mass offset from the geometric centre, but it has an axis of symmetry through both these points, and equal moments of inertia about all axes orthogonal to the symmetry axis. There are three constants of motion: the total energy and two quantities involving the angular momenta. It is straightforward to demonstrate that these quantities, known as the Jellett and Routh constants, are integrals of the motion. However, their physical significance has not been fully understood. In this paper, we show how the integrals of the Routh sphere arise from Emmy Noether’s invariance identity. We derive expressions for the infinitesimal symmetry transformations associated with these constants. We find the finite version of these symmetries and provide their geometrical interpretation. As a further demonstration of the power and utility of this method, we find the Noetherian symmetries and corresponding integrals for a system introduced recently, the Chaplygin ball on a rotating turntable, confirming that the known integrals are directly obtained from Noether’s theorem. Keywords: Noether’s theorem, nonholonomic systems, symmetry, Routh sphere, Chaplygin ball Citation: Bustamante M. D.,  Lynch P., Nonholonomic Noetherian Symmetries and Integrals of the Routh Sphere and the Chaplygin Ball, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 511-524 DOI:10.1134/S1560354719050058
 Esen O.,  Jiménez V. M.,  de León M.,  Sardón C. Reduction of a Hamilton – Jacobi Equation for Nonholonomic Systems Abstract We discuss, in all generality, the reduction of the Hamilton – Jacobi equation for systems subject to nonholonomic constraints and invariant under the action of a group of symmetries.We consider nonholonomic systems subject to both linear and nonlinear constraints and with different positioning of such constraints with respect to the symmetries. Keywords: Hamilton – Jacobi, theory of reduction, nonholonomic systems; constrained systems, nonlinear constraints, reconstruction, symplectic reduction, Marsden –Weinstein reduction, symmetries Citation: Esen O.,  Jiménez V. M.,  de León M.,  Sardón C., Reduction of a Hamilton – Jacobi Equation for Nonholonomic Systems, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 525-559 DOI:10.1134/S156035471905006X
 Bizyaev I. A.,  Borisov A. V.,  Mamaev I. S. Different Models of Rolling for a Robot Ball on a Plane as a Generalization of the Chaplygin Ball Problem Abstract This paper addresses the problem of the rolling of a spherical shell with a frame rotating inside, on which rotors are fastened. It is assumed that the center of mass of the entire system is at the geometric center of the shell. For the rubber rolling model and the classical rolling model it is shown that, if the angular velocities of rotation of the frame and the rotors are constant, then there exists a noninertial coordinate system (attached to the frame) in which the equations of motion do not depend explicitly on time. The resulting equations of motion preserve an analog of the angular momentum vector and are similar in form to the equations for the Chaplygin ball. Thus, the problem reduces to investigating a two-dimensional Poincaré map. The case of the rubber rolling model is analyzed in detail. Numerical investigation of its Poincaré map shows the existence of chaotic trajectories, including those associated with a strange attractor. In addition, an analysis is made of the case of motion from rest, in which the problem reduces to investigating the vector field on the sphere $S^2$. Keywords: nonholonomic mechanics, Chaplygin ball, rolling without slipping and spinning, strange attractor, straight-line motion, stability, limit cycle, balanced beaver-ball Citation: Bizyaev I. A.,  Borisov A. V.,  Mamaev I. S., Different Models of Rolling for a Robot Ball on a Plane as a Generalization of the Chaplygin Ball Problem, Regular and Chaotic Dynamics, 2019, vol. 24, no. 5, pp. 560-582 DOI:10.1134/S1560354719050071

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