Distribution of the vibration effect within the stacked boxes during vehicular road transportation of tomatoes

C. Ranatunga, H. Jayaweera, S. Suraweera, T. Ariyaratne
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引用次数: 2

Abstract

Parameters of the Road-Vehicle-Load system influence the vibration effects generated at vehicular road transportation. Vertical vibration acceleration (PSDmax) experienced by the tomato boxes and tomatoes within the box was studied using the popular transport means in Illukkumbura area in Matale. The road quality was estimated using the International Road Roughness Index (IRI). Fully loaded Mitsubishi Canter truck at an average speed of 20 kmh-1 on a road rated at IRI between 2 to 3.5 mm/m registered increasing trend in the PSD of vibration from the front side towards the rear side of the truck in the horizontal direction. The observed average PSD values are in the approximate ratio, front : middle : rear ≈ 1 : 3: 6. Also the PSD of the vibration was found to be amplified from the bottom stack towards the topmost stack in the vertical direction. The observed average PSD values at 1st, 2nd, 3rd, and 4th stacks are in the approximate ratio, 1 : 1 : 1.5 : 2.5. PSD of vibration was studied with a fully loaded truck at different speeds on a road consisting of segments rated at varying IRI. The fully loaded truck at different speeds on a road consisting of segments rated at varying IRI registered varying PSD values of vibration. Even at lower speeds such as 25 kmh-1 the vibration acceleration produced at “poor” quality (IRI > 5 mm/m) roads was nearly 4 times higher compared to that produced at “fair” (IRI 2 to 3.5 mm/m) or “good” quality (IRI 0.9 to 2 mm/m) roads. Registered pattern of the PSD appears to be similar at the tomato boxes and at the tomatoes within the same box.
番茄车辆公路运输过程中堆垛箱内振动效应的分布
道路-车辆-荷载系统的参数影响车辆道路运输时产生的振动效应。利用马塔莱伊鲁克库姆布拉地区常用的运输工具,研究了番茄箱和箱内番茄的垂直振动加速度(PSDmax)。采用国际道路不平度指数(IRI)对道路质量进行评估。在平均速度为20km -1的满载三菱中心卡车上,在额定IRI为2 ~ 3.5 mm/m的道路上,在水平方向上,从卡车的前部到后部的振动PSD呈增加趋势。观测到的平均PSD值为前:中:后≈1:3:6的近似比值。在垂直方向上,振动的PSD从最底部向最顶部增大。在第1、第2、第3和第4层观测到的平均PSD值近似为1:1:1.5:2.5。研究了一辆满载卡车在不同速度下行驶在由不同IRI路段组成的道路上的振动PSD。满载卡车以不同的速度行驶在由不同IRI等级的路段组成的道路上,记录了不同的PSD振动值。即使在较低的速度下,如25公里/小时,在“差”质量(IRI > 5毫米/米)道路上产生的振动加速度比在“一般”(IRI 2至3.5毫米/米)或“好”质量(IRI 0.9至2毫米/米)道路上产生的振动加速度高近4倍。在番茄箱和同一箱内的番茄上,PSD的记录模式似乎是相似的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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