Structural optimization of tractor frame for noise reduction

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Structural optimization of tractor frame for noise reduction

Koizumi, T. / Tsujiuchi, N. / Sawabe, S. / Kubomoto, I. / Ishida, E.

This paper describes understanding and modeling of the dynamic characteristic of the tractor frame, and decrease of vibration and noise of the tractor by design modification of the frame. First of all, we measured the vibration characteristics each part of the tractor, and the noise characteristic in the cabin. As the result, we confirmed that the bending mode of the frame greatly influence the vibration characteristic of the tractor, and noise in cabin become very loud for resonance frequency of its mode coincide with resonance frequency in the cabin. Secondly, we separated the full structure of the frame into the sub-structure of a case and joint part, and modeled each one. Then we improved the model accuracy by the use of model tuning with sensitivity analysis, constructed a dynamic model for the frame. By comparing the analytical results with the experimental results, the validity of the dynamic model was verified. Finally, we carried out design change of the frame with the object of increasing stiffness while reducing weight. As the results of this modification, we could shift the objected natural frequency more than 13 Hz if it is needed. And also it could be said that noise level inside the cabin can be effectively suppressed at leased 4 dB.