小型履带式采伐机转向理论分析与计算
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摘要
为改善小型履带式采伐机转向性能和提高采伐机采伐作业时的工作效率,运用转向动力学和履带行走机构转弯理论对小型采伐机的履带行走机构进行转向阻力矩和转向受力分析,并推导出理论转弯半径、转向阻力矩、转向参数的数学表达式。以履带行走机构接地长度,轨距以及采伐机自重等参数为例进行计算,计算出理论转弯半径、理论转向阻力矩、转向系数、转向比。结果表明,当转向系数k>0.5时,慢侧履带制动,快侧履带提供切线牵引力与实际工作情况完全吻合;同时验证了理论分析的准确性,为小型履带式采伐机的转向理论研究提供了理论依据。
In order to improve the steering ability and working efficiency of the small-scale crawler cutting machine,steering dynamics and crawler system turning theory was applied to analyze the steering torque and steering force of the small crawler cutting machine turning,and deduce the mathematical expression of theoretical turning radius,turning resistance moment and steering parameters.Taking some parameters such as crawler ground length,track gauge and the self weight of the cutting machine to calculate the turning radius,steering torque,steering coefficients and steering ratio in theory. The results showed that while steering coefficient k > 0. 5,the theoretical slow track brake,the fast track providing tangential traction coincided with the actual work,and the accuracy of theoretical analysis was verified,so as to provide a theoretical basis for steering small crawler cutting machine.
In order to improve the steering ability and working efficiency of the small-scale crawler cutting machine,steering dynamics and crawler system turning theory was applied to analyze the steering torque and steering force of the small crawler cutting machine turning,and deduce the mathematical expression of theoretical turning radius,turning resistance moment and steering parameters.Taking some parameters such as crawler ground length,track gauge and the self weight of the cutting machine to calculate the turning radius,steering torque,steering coefficients and steering ratio in theory. The results showed that while steering coefficient k > 0. 5,the theoretical slow track brake,the fast track providing tangential traction coincided with the actual work,and the accuracy of theoretical analysis was verified,so as to provide a theoretical basis for steering small crawler cutting machine.
引文
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[13]AL-MILLI S,SENEVRATNE L D,ALTHOEFER K.Track-terrain modelling and traversability prediction for tracked vehicles on soft terrain[J].Journal of Terramechanics,2010,47(3):151-160.
[2]周君,王殿龙,徐伟,等.履带车辆硬地面转向阻力矩算法的研究[J].起重运输机械,2010(5):20-23.
[3]王红岩,王钦龙,芮强,等.高速履带车辆转向过程分析与试验验证[J].机械工程学报,2014(16):162-172.
[4]罗恩志,冯江,张敏,等.基于滑转条件下的履带车辆原地转向特性研究[J].农机化研究,2013(2):240-243.
[5]PARK W Y,CHANG Y C,LEE S S,et al.Prediction of the tractive performance of a flexible tracked vehicle[J].Journal of Terramechanics,2008,45(1):13-23.
[6]周鸣宇,叶龙,祁建.大型双履带车辆转向性能的研究[J].机械设计与制造,2013(12):87-89.
[7]朱爱斌,王步康,田超,等.履带行走机构功率损耗分析系统设计与实现[J].工程设计学报,2011(6):444-448.
[8]宋海军,高连华,李军,等.履带车辆转向功率分析[J].车辆与动力技术,2007(1):45-48.
[9]杨春梅,杨博,马岩,等.林间履带式多功能底盘的设计与分析[J].安徽农业科学,2013,41(8):3 710-3 712.
[10]周新年,陈辉荣,游航,等.基于时间序列的天然林林分直径分布预测模型[J].福建林学院学报,2013,33(4):298-304.
[11]郭明春,刘建锋.杉木人工林林分生长模拟[J].福建林学院学报,2011,31(1):65-68.
[12]周新年,赖阿红,周成军,等.山地森林生态采运研究进展[J].森林与环境学报,2015,35(2):185-192.
[13]AL-MILLI S,SENEVRATNE L D,ALTHOEFER K.Track-terrain modelling and traversability prediction for tracked vehicles on soft terrain[J].Journal of Terramechanics,2010,47(3):151-160.