Vibration Dynamic Characteristics Simulation for Helicopter Main Gear Box Test Bench

New elements are usually used in developing promising products, and they are introduced to improve its characteristics. This study objective is aimed at making certain decisions to eliminate or reduce negative effects of design and technological solutions that are being identified only at the bench testing stage. Problem of resonant interactions between bench elements and main gear box units is connected to significant distortion of the product under development dynamic analysis results. Therefore, identifying resonant interaction conditions and obtaining reliable results in the course of developing any kind of units is relevant for the aviation industry enterprises. JSC "Reduktor--PM" created a universal bench, and it was involved in solving this task practically for the first time, since significant oscillation levels were registered significantly exceeding the calculated values in the process of testing the bench. To determine the bench element base frequencies, the modal analysis task was finalized to identifying natural frequencies of the bench structural elements and partial frequencies of these elements at installing the unit on the bench. Wave transformation pattern in complex structures significantly depends on the element base and the structural connection between its components. In fact, the wave field structure is n-dimensional. Nevertheless, general approaches to generating interaction conditions are possible on the basis of their expansion in coordinates. In this case, the algorithm for determining oscillation natural frequencies in the bench elements and in the structure as a whole is based on the modal analysis

Литература

[1] Ayrapetov E.L. Dynamic loading of multiple-tooth contacts. Vestnik mashinostroeniya, 1991, no. 8, pp. 18--21 (in Russ.).

[2] Ayrapetov E.L., Kosarev O.I. [Effect of different driving factors on oscillations of helical gearing with tooth frequency]. Progressivnye zubchatye peredachi. Dokl. Mezhdunar. simp. [Advanced Tooth Gearing. Proc. Int. Symp.]. Izhevsk, 1994, pp. 26--31 (in Russ.).

[3] Ayrapetov E.L., Kosarev O.I. Numerical modelling of vibration processes in helical gearing. Peredachi i transmissii, 1996, no. 1, pp. 21--28 (in Russ.).

[4] Bednyy I.A., Zinyukov P.I. [Mathematical modelling of vibrations in mechanisms with tooth gearing]. Progressivnye zubchatye peredachi. Dokl. Mezhdunar. simp. [Advanced Tooth Gearing. Proc. Int. Symp.]. Izhevsk, 1994, pp. 48--51 (in Russ.).

[5] Sedov V.L., Selivanovskiy Yu.M. Snizhenie vibratsii reduktora za schet povysheniya tochnosti izgotovleniya [Reducing redactor vibration by raising accuracy of manufacturing]. V: Vibroakusticheskaya aktivnost’ mekhanizmov s zubchatymi peredachami [In: Vibroacoustic activity of mechanisms with tooth gearing]. Moscow, Nauka Publ., 1971, pp. 98--100 (in Russ.).

[6] Kosarev O.I. [Determination of dynamic loading on teeth by numerical modelling method]. Teoriya i praktika zubchatykh peredach. Tr. Mezhdunar. konf. [Theory and Practice of Tooth Gearing. Proc. Int. Conf.]. Izhevsk, 1996, pp. 153--158 (in Russ.).

[7] Aparkhov V.I., Panchenko V.I. Special aspects of vibration excitation from tooth changeover in planetary gearing. Mashinovedenie, 1966, no. 4, pp. 46--54 (in Russ.).

[8] Ayrapetov E.L. Issledovanie statiki i dinamiki planetarnykh mekhanizmov. Avtoref. dis. d-ra tekh. nauk. [Study on statics and dynamics of planetary mechanisms. Abs. Dr. Sc. (Eng.) Diss.]. Moscow, IMASh Publ., 1973.

[9] Ayrapetov E.L., Genkin M.D. Dinamika planetarnykh mekhanizmov [Dynamics of planetary mechanisms]. Moscow, Nauka Publ., 1980.

[10] Aparkhov V.I., Fedoseev Yu.N. Issledovanie vzaimosvyazannosti kolebaniy tsentralʼnogo kolesa planetarnogo mekhanizma [Study on relations between vibrations of central gear in planetary mechanism]. V: Vibroakusticheskaya aktivnost’ mekhanizmov s zubchatymi peredachami [In: Vibroacoustic activity of mechanisms with tooth gearing]. Moscow, Nauka Publ., 1971, pp. 86--92 (in Russ.).

[11] Yampol’skiy I.D., Il’ichev V.Yu. Effect of joint construction on rotor system dynamics. Trudy MGTU, 2001, no. 581, pp. 187--201 (in Russ.).

[12] Yampol’skiy I.D., Il’ichev V.Yu. Study on forces and moments in joint of rubber-finger coupling at decentering of shaft axis. Trudy MGTU, 2000, no. 578, pp. 145--161 (in Russ.).

[13] Kozharinov E.V. Raschet i proektirovanie dempfera sukhogo treniya konicheskogo zubchatogo kolesa. Dis. kand. tekh. nauk [Calculation and design of rubbing friction damper of bevel gear wheel. Cand. Sc. (Eng.) Diss.]. Moscow, Bauman MSTU Publ., 2017.

[14] Timoshenko S., Goodier J.N. Theory of elasticity. McGraw-Hill, 1951.

[15] Babakov I.M. Teoriya kolebaniy [Oscillation theory]. Moscow, Nauka Publ., 1968.

[16] Biderman V.L. Teoriya mekhanicheskikh kolebaniy [Theory of mechanical vibrations]. Moscow, Vysshaya shkola Publ., 1972.

[17] Bolotin V.V., ed. Vibratsii v tekhnike. T. 1. Kolebaniya lineynykh system [Vibrations in technique. Vol. 1. Vibrations of linear systems]. Moscow, Mashinostroenie Publ., 1978.

[18] Panovko Ya.G. Osnovy prikladnoy teorii kolebaniy i udara [Fundamentals of oscillations and hit applied theory]. Leningrad, Mashinostroenie Publ., 1976.