|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
Peer-reviewed Journal Articles, etc >
Vibration analysis during grass harvesting according to ISO vibration standards
| Title: | Vibration analysis during grass harvesting according to ISO vibration standards |
| Authors: | Kang, Tae-Hwan Browse this author | | Kaizu, Yutaka Browse this author |
| Keywords: | RTK-GPS | | IMU | | ISO standard | | Fourier transformation | | 1/3 Octave band center frequency | | Vibration acceleration |
| Issue Date: | Nov-2011 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Computers and Electronics in Agriculture |
| Volume: | 79 |
| Issue: | 2 |
| Start Page: | 226 |
| End Page: | 235 |
| Publisher DOI: | 10.1016/j.compag.2011.10.003 |
| Abstract: | This research evaluated the working efficiency and comfort of operation by measuring vibration acceleration of tractors during grass harvesting. A real-time kinematic global positioning system and an inertial measurement unit installed in a tractor normally used by farmers during grass harvesting were used to acquire tractor vibration acceleration data. Analysis of the position and vibration acceleration data of tractors by a Fourier transformation yielded a power spectrum of vibration acceleration at each frequency (1-10 Hz) and position. The root mean square of vibration acceleration at each frequency (1-10 Hz) was calculated with the center frequency of the 1/3 octave bands (1.0,1.25,1.6,2.0,2.5,3.15,4,5,6.3,8,and 10 Hz) based on ISO standards. To evaluate the working efficiency in the grassland, geographical information system maps were generated using the power spectrum of vibration acceleration and the limit on working time for each frequency that negatively affected the tractor driver. The vibration acceleration in the longitudinal (ax) and lateral (ay) directions at the center frequency of the 1/3 octave band below 2.0 Hz exceeded the fatigue-decreased proficiency and reduced the comfort boundaries stipulated in ISO 2631 (1974). In the area where working characteristics are severe, the vibration acceleration in the vertical direction (az) is high. The vibration acceleration in the az direction at the center frequency of the 1/3 octave band (5-10 Hz) clearly indicates discomfort during grass harvesting and a decrease in the work efficiency beyond one hour. The total vibration acceleration (av) at the center frequency of 5.0 Hz of the 1/3 octave band served to evaluate comfort in the whole field during grass harvesting - the av value is higher than that at other frequencies. The area with severe working characteristics showed a higher av value at the center frequency of 8.0 Hz than that at other frequencies. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/48178 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 海津 裕
|
