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首页> 外文会议>14th International ISTVS conference >The Effect of a Suspension on Traction on a SandyLoam Soil
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The Effect of a Suspension on Traction on a SandyLoam Soil

机译：悬浮液对砂壤土牵引力的影响

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Suspensions are becoming more commonly available on agricultural tractors butrnthere is little published information on their effect on traction. The paper reviews the initialrnresults of experiments carried out with the aim of investigating the effect of wheel vibration onrntraction using a 495/70 R24 XM47 radial tyre and a coil spring and damper suspension as usedrnon high mobility agricultural tractors. Some new results and modelling are presented. Tractionrnand vibration data were collected using a single wheel tester operating on a compacted sandyrnloam soil in a ground level soil tank with a sine wave cut into the surface. Resulting vibrationrnoutput and drawbar pull were measured with the suspension active and locked out of use. Arntrack vibration input amplitude of ± 5 mm to ±7 mm, a wavelength of 0.76 m and tyre pressuresrnof 1 bar, 1.5 bar and 2 bar were used. The range of forward speeds included input vibration atrnthe tyre’s natural frequency. Wheel static loads of 2060 kg and 1065 kg were compared with therncontrol load of 1560 kg. The tyre characteristics of dynamic radial stiffness, damping, andrnvibration amplitude transmissibility were determined.rnFor the sandy loam soil and tyre used, the main conclusions were: The greatest variation ofrndrawbar pull was found at the tyre’s natural frequency and at the higher tyre pressure of 2 barrnwith the suspension locked out of use. Increasing the wheel load to 2060 kg had a large effect inrnreducing the draw bar pull variation. Reducing the tyre pressure to 1 bar had a greater effect inrnreducing the draw bar pull variation. Reducing tyre pressure increased tyre damping andrnincreasing the tyre load also increased tyre damping. The suspension had a large effect inrnreducing the variation in drawbar pull at the higher tyre pressure of 2 bar but had little effect at arntyre pressure of 1 bar. As the input frequency reduced towards the natural frequency of thernspring and sprung mass the draw bar pull variation can increase to be comparable with orrngreater than with the suspension locked out of use. The drawbar pull variation with thernsuspension active was found to be very similar over the input frequency range for all therncombinations of tyre pressure and load used. Models based on predicting the tyre dynamic loadrnfit the general form of the data collected but the experimental error requires more analysis andrnevaluation.
机译：悬架在农用拖拉机上越来越普遍，但是关于它们对牵引力的影响的公开信息很少。这篇论文回顾了实验的初步结果，目的是研究使用495/70 R24 XM47子午线轮胎和螺旋弹簧和减震器悬架作为二手高机动性农用拖拉机的车轮振动对牵引的影响。介绍了一些新的结果和建模。牵引和振动数据是使用单轮测试仪收集的，该测试仪在地面土壤罐中的压实沙壤土上操作，正弦波切入地面。在悬架处于活动状态并停止使用时，测量由此产生的振动输出和牵引杆拉力。使用的Arntrack振动输入振幅为±5 mm至±7 mm，波长为0.76 m，轮胎压力为1 bar，1.5 bar和2 bar。前进速度的范围包括轮胎固有频率的输入振动。车轮静载荷为2060 kg和1065 kg，控制载荷为1560 kg。确定了轮胎的动态径向刚度，阻尼和振动振幅传递率的特征。对于所用的沙壤土和轮胎，主要结论是：在轮胎的固有频率和较高轮胎压力2下，最大拉拔力变化最大。悬架已锁定，无法使用。将车轮载荷增加到2060 kg会对减小拉杆拉力变化产生很大影响。将轮胎压力降低至1 bar具有更大的效果，可降低牵引杆的拉力变化。降低轮胎压力会增加轮胎阻尼，增加轮胎负载也会增加轮胎阻尼。在较高的轮胎压力为2 bar的情况下，悬架具有显着的减小牵引力变化的作用，而在轮胎压力为1 bar的情况下，悬架作用很小。随着输入频率朝着弹簧和弹簧质量的固有频率降低，拉杆的拉力变化可能会增加，从而与orrngreater相当，而悬架被锁定而不再使用。发现在轮胎频率和所用载荷的所有组合下，悬架有效的牵引力变化在输入频率范围内非常相似。基于预测轮胎动态载荷的模型适合所收集数据的一般形式，但实验误差需要更多的分析和重新评估。

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