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2026 Vol.38, Issue 3 Preview Page

Research Article

Analysis of Noise and Seat-Mount Vibration Characteristics in an Agricultural Tractor Cab under Different Transmission Gear Combinations
Jung-Yeon Seo1
,
Jinho Won1
,
Jeongju Chae1
,
Seung-Je Cho2
,
Dae-Cheol Kim34*
,
Yongjin Cho34*
1Graduate Student, Department of Bioindustrial Machinery Engineering, Jeonbuk National University, Jeonju 54896, Korea
2Senior Researcher, Specialized Machinery and Robotics Group, Jeonbuk Technology Application Division (Specialized Machinery), Korea Institute of Industrial Technology, Gimje 54325, Korea
3Professor, Department of Bioindustrial Machinery Engineering, Jeonbuk National University, Jeonju 54896, Korea
4Professor, Institute of Agricultural Machinery ICT Convergence, Jeonbuk National University, Jeonju 54896, Korea
*Corresponding Author
30 September 2026. pp. 353-373
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Abstract

Modern agricultural tractors operate with various implements and transmission gear combinations that can affect cab vibration and noise even at the same engine speed. This study evaluated the seat-mount vibration and cab noise characteristics of an agricultural tractor under different transmission gear combinations. Experiments were conducted in an anechoic chamber equipped with a dynamometer using a 76.8 kW tractor at a rated engine speed of 2,200 rpm. The test conditions included neutral and 12 forward combinations of four main gears (1－4) and three range gears (L, M, and H). Vibration was measured in the X, Y, and Z directions using a triaxial accelerometer at the seat mounting point, whereas noise was measured at the operator’s left and right ear positions using microphone positions based on ISO 5131. The frequency-weighted root-mean-square (RMS) acceleration and total vibration value based on the weighting method specified in ISO 2631-1, power spectral density, and A-weighted equivalent sound pressure level (LAeq) were analyzed. The total vibration value ranged from 0.351 to 1.323 m/s2 under forward driving conditions and was highest under H4 (1.323 ± 0.071 m/s2). The Z-axis made the greatest contribution in 9 of the 12 combinations and accounted for approximately 91.5% under H4. For representative conditions, dominant frequencies ranged from 0.98 to 3.61 Hz. The X- and Y-axis spectra were characterized primarily by components within this range, whereas the Z-axis also exhibited secondary components near 23－25 Hz in all representative conditions and near 35－42 Hz in some scenarios. LAeq ranged from 79.87 to 92.76 dB(A) at the right ear and from 78.29 to 91.30 dB(A) at the left ear, with the highest levels observed under H3. Overall, the seat-mount vibration and cab noise depended on specific gear combinations rather than increasing consistently with the gear stage.

Keywords
Agricultural tractor
Cab noise
Power spectral density
Seat-mount vibration
Transmission gear combination
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Information
  • Publisher :Agriculture and Life Sciences Research Institute, Kangwon National University
  • Publisher(Ko) :None
  • Journal Title :Journal of Agricultural, Life and Environmental Sciences
  • Volume : 38
  • No :3
  • Pages :353-373
  • Received Date : 2026-07-29
  • Revised Date : 2026-08-20
  • Accepted Date : 2026-08-26
  • DOI :https://doi.org/10.22698/jales.20260025
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