When agricultural vehicles operate in the field, the soft road excitation makes it difficult to measure the vehicle vibration. A camera-accelerator system can solve this issue by utilizing computer vision information; however, the relationship between the field road surface and the vehicle vibration response remains an unsolved problem. This study aims to investigate the correlation of the soft road excitation of different long-wave surfaces with the vehicle vibration response. Vibration equation between the vehicle and soft road surface system was established to produce an effective roughness model of the field soft road surface. In order to simulate the vehicle vibration state under different long-wave road surfaces, the soil rectangular pits with 21 kinds of different spans and depths were applied to the road surfaces, and a tractor vibration test system was built for vibration test. The frequency spectrum analysis was performed for the vibration response and the roughness signals of the road surfaces. The results showed that coefficient (R²) of frequency correlation between the roughness excitation and the original unevenness at the excitation point at the rear end of the rectangular soil pit fell within 0.9641∼0.9969. The main frequency band of the vibration response fell within 0∼3 Hz, and the phenomenon of quadruple frequency existed. The correlation of roughness excitation with quadruple frequency fell within 0.992165∼1. The primary excitation points were located at the rear end of the rectangular soil pit. In addition, it also indicated that when the vehicle was driven without autonomous power, the vehicle vibration frequency mainly depended on the excitation frequency of the field road surface and the frequency at the maximum vehicle vibration intensity was 2 or 3 times of that at the maximum field soft road excitation. These findings may provide a reference for optimal design of vibration reduction and control for agricultural vehicles.

中文翻译：

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通过振动感应从野外道路和车辆之间的相互作用感知激励特性

当农用车辆在野外作业时，柔和的道路激励使其难以测量车辆的振动。摄影机加速器系统可以通过利用计算机视觉信息来解决此问题；但是，野外路面与车辆振动响应之间的关系仍然没有解决。这项研究旨在研究不同长波表面的软路面激励与车辆振动响应之间的关系。建立了车辆与软路面系统之间的振动方程，以产生有效的现场软路面粗糙度模型。为了模拟不同长波路面下的车辆振动状态，在路面上应用了21种不同跨度和深度的矩形矩形坑，并建造了用于振动测试的拖拉机振动测试系统。对路面的振动响应和粗糙度信号进行了频谱分析。结果表明，系数（R ²）在矩形土坑后端激励点处的粗糙度激励与原始不均匀度之间的频率相关性在0.9641〜0.9969之间。振动响应的主频带在0〜3Hz以内，存在四倍频现象。粗糙度激励与四倍频的相关性在0.992165〜1之间。主要激发点位于矩形土坑的后端。另外，还表明，当车辆在没有自主动力的情况下行驶时，车辆的振动频率主要取决于野外路面的激励频率，并且在最大车辆振动强度下的频率是最大振动强度的2或3倍。场软路激励。