Vibration analysis during grass harvesting according to ISO vibration standards
Vibration analysis during grass harvesting according to ISO vibration standards
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根据 ISO 振动标准对草收割期间的振动进行分析
DOI：
10.1016/j.compag.2011.10.003
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Kang;T.H.;Kaizu;Y.
通过测量拖拉机在割草过程中的振动加速度，评价拖拉机的工作效率和操作舒适性。采用实时动态全球定位系统和惯性测量装置，在农民通常使用的拖拉机上采集拖拉机振动加速度数据。对拖拉机的位置和振动加速度数据进行了傅里叶变换，得到了各频率（1- 10 Hz）和位置的振动加速度功率谱。根据ISO标准，以1/3倍频程（1.0，1.25，1.6，2.0，2.5，3.15，4，5，6.3，8，10 Hz）的中心频率为基础，计算了各频率（1- 10 Hz）下振动加速度的均方根值。为了评估在草原上的工作效率，地理信息系统地图生成的振动加速度的功率谱和工作时间的限制，对拖拉机司机产生负面影响的每个频率。在1/3倍频程带中心频率低于2.0Hz处，纵向（ax）和横向（ay）的振动加速度超过了疲劳降低能力，降低了ISO 2631（1974）规定的舒适度界限。在工作特性严重的区域，垂直方向（az）上的振动加速度高。在1/3倍频程（5- 10 Hz）的中心频率处沿z方向的振动加速度清楚地表明在割草过程中的不适和超过1h的工作效率的降低。在1/3倍频程频带的中心频率5.0Hz处的总振动加速度（aν）用于评价整个草坪在收割过程中的舒适性，aν值高于其他频率处的值。工作特性严重的区域在中心频率8.0Hz处的aν值比其它频率处的aν值大。
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 (1–10Hz) and position. The root mean square of vibration acceleration at each frequency (1–10Hz) 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 10Hz) 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 2.0Hz 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 azdirection at the center frequency of the 1/3 octave band (5–10Hz) clearly indicates discomfort during grass harvesting and a decrease in the work efficiency beyond 1h. The total vibration acceleration (aν) at the center frequency of 5.0Hz of the 1/3 octave band served to evaluate comfort in the whole field during grass harvesting—the aνvalue is higher than that at other frequencies. The area with severe working characteristics showed a higher aνvalue at the center frequency of 8.0Hz than that at other frequencies.