This paper deals with the paradoxical properties of the solution of string vibration under a moving mass. The solutions published to date are not simple enough and cannot be applied to investigations in the entire range of mass speeds, including the overcritical range. We propose a formulation of the problem that allows us to reduce the problem to a second-order matrix differential equation. Its solution is characteristic of all features of the critical, subcritical, and overcritical motion. Results exhibit discontinuity of the mass trajectory at the end support point, which has not been previously reported in the literature. The closed solution in the case of a massless string is analyzed and the discontinuity is proved. Numerical results obtained for an inertial string demonstrate similar features. Small vibrations are analyzed, which is why the effect discussed in the paper is of purely mathematical interest. However, the phenomenon results in complexity in discrete solutions.
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Panovko, J.: Historical outline of the theory of dynamic influence of moving load (in Russian). Eng. Acad. Air Forces 17, 8–38 (1948)
Jakushev, N.Z.: Certain problems of dynamics of the beam under moving load (in Russian). Kazan Univ. 12, 199–220 (1974)
Dmitrijev, A.S.: The analysis of solutions of problems with lateral oscillatory vibrations of various beam structures under the motion of non spring point load (in Russian). Mach. Dyn. Problems 24, 18– (1985)
Saller, H.: Einfluss bewegter Last auf Eisenbahnoberbau und Brücken. Kreidels Verlag, Berlin und Wiesbaden (1921)
Inglis, C.E.: A Mathematical Treatise on Vibrations in Railway Bridges. Cambridge University Press, London (1934)
Schallenkamp, A.: Schwingungen von Trägern bei bewegten Lasten. Arch. Appl. Mech. (Ingenieur Archiv) 8(3), 182–198 (1937)
Bolotin, W.W.: On the influence of moving load on bridges (in Russian). Rep. Moscow Univ. Railway Transp. MIIT 74, 269–296 (1950)
Bolotin, W.W.: Problems of bridge vibration under the action of the moving load (in Russian). Izvestiya AN SSSR, Mekh. Mashinostroenie 4, 109–115 (1961)
Morgaevskii, A.B.: Critical velocities calculation in the case of a beam under moving load (in Russian). Mekh. Mashinostroenie, Izvestiya AN SSSR, OTN 3, 176–178 (1959)
Szcześniak, W.: Inertial moving loads on beams (in Polish). Scientific Reports, Technical University of Warsaw, Civil Engineering 112 (1990)
Ting, E.C., Genin, J., Ginsberg, J.H.: A general algorithm for moving mass problems. J. Sound Vib. 33(1), 49–58 (1974)
Smith, C.E.: Motion of a stretched string carrying a moving mass particle. J. Appl. Mech. 31(1), 29–37 (1964)
Frỳba, L.: Vibrations of solids and structures under moving loads. Academia, Prague (1972)
Wu, J.-J.: Dynamic analysis of an inclined beam due to moving loads. J. Sound Vib. 288, 107–131 (2005)
Metrikine, A.V., Verichev, S.N.: Instability of vibration of a moving oscillator on a flexibly supported Timoshenko beam. Arch. Appl. Mech. 71(9), 613–624 (2001)
Pesterev, A.V., Bergman, L.A., Tan, C.A., Tsao, T.-C., Yang, B.: On asymptotics of thesolution of the moving oscillator problem. J. Sound Vib. 260, 519–536 (2003)
Biondi, B., Muscolino, G.: New improved series expansion for solving the moving oscillator problem. J. Sound Vib. 281, 99–117 (2005)
Andrianov, I.V., Awrejcewicz, J.: Dynamics of a string moving with time-varying speed. J. Sound Vib. 292, 935–940 (2006)
Michaltsos, G.T.: Dynamic behaviour of a single-span beam subjected to loads moving with variable speeds. J. Sound Vibr. 258(2), 359–372 (2002)
Gavrilov, S.N., Indeitsev, D.A.: The evolution of a trapped mode of oscillations in a string on an elastic foundation G moving inertial inclusion system. J. Appl. Math. Mech. 66(5), 852–833 (2002)
Gavrilov, S.N.: The effective mass of a point mass moving along a string on a Winkler foundation. J. Appl. Math. Mech. 70(4), 641–649 (2006)
Rodeman, R., Longcope, D.B., Shampine, L.F.: Response of a string to an accelerating mass. J. Appl. Mech. 98(4), 675–680 (1976)
Kaplunov, Y.D.: The torsional oscillations of a rod on a deformable foundation under the action of a moving inertial load (in Russian). Izv Akad Nauk SSSR, MTT 6, 174–177 (1986)
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Dyniewicz, B., Bajer, C.I. Paradox of a particle’s trajectory moving on a string. Arch Appl Mech 79, 213–223 (2009). https://doi.org/10.1007/s00419-008-0222-9
- Moving mass
- Vibrations of string
- Inertial load