GDN-01 INFLUENCE OF GEAR ECCENTRICITY ON SIDEBANDS OF MESH FREQUENCY : DERIVATION AND DETECTION OF AMPLITUDE MODULATION BY TRANSMISSION ERROR MEASUREMENT(DYNAMICS AND NOISE PROBLEMS OF GEARS AND GEAR BOXES)

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  • KUROKAWA Syuhei
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • BEKKI Atsushi
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • MATSUKAWA Yoji
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • UMEZAKI Yoji
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • DOI Toshiro
    Department of Mechanical Engineering, Graduate School, Kyushu University

Description

The influence of gear eccentricity is normally considered that it is not so important for gear transmissions. However gear eccentricity causes large delay motion, and tooth meshing noise is subjected to two kinds of modulations; frequency modulation and amplitude modulation. That is one of sources of beat noise and sideband noise of mesh frequency. The purpose of this research is to clarify the influence of gear eccentricity on the characteristics of noise spectrum using transmission error analysis. In this paper, relations between amplitude modulation and sidebands of mesh frequency were investigated. By assuming that the mesh wave is purely sinusoidal, the modulated spectrum was calculated theoretically. Sideband spectrum consists of two components, whose amplitudes were calculated by modulation indices. To identify the concrete modulation indices, the amount of amplitude modulation was detected directly by transmission error measurement under load. From measured data, modulation indices can be calculated using amplitude of mesh frequency components and amount of amplitude modulation.

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