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A STUDY ON DESIGN METHOD FOR HYDRO-MECHANICAL CONTINUOUSLY VARIABLE TRANSMISSION

Bibliographic Information

Other Title
  • 油圧機械式無段変速機の設計手法に関する研究
  • (Prediction of Noise Based on 1-D and 3-D Simulation)
  • (1-D・3-Dシミュレーションによる油圧騒音予測)

Abstract

<p>For agricultural tractor, these two performances have been very important; high efficiency and maneuverability because the operator has increasingly required the fewer fuel consumption and easier and more precise control of the tractor. Generally speaking, hydro-mechanical transmission (HMT) is well known for the high efficiency level and the step-less variable speed. However, HMT is hydraulic powered system then hydraulic noise may more often occur than the pure mechanical transmission.</p><p>Therefore, this paper shows how to predict the sound pressure level with only using the design parameters of HMT and transmission assembly parts. 1-D hydraulic circuit simulation model and 3-D FEM model of HMT have been developed, and the simulated results of the sound pressure level has been calculated. Moreover, the calculated sound pressure level has been validated by the actual measured data and the cause of prediction error has been found. These all results suggest the possibility that the hydraulic noise can be reduced in an optimal way at the design process, without any prototype testing.</p>

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