基于多体动力学仿真的拖拉机动力换挡同步时间预测

IF 1.4 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
Hyun-Woo Han, Jung-Su Han, W. Chung, Ji-Tae Kim, Young-Jun Park
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引用次数: 2

摘要

highlightspretion对功率换挡传输的同步时间进行了预测。推导了同步时间的解析方程,建立了多体动力学模型。将模型结果与同步器功率换档试验结果进行了比较。减少了自动变速器设计的计算量和设计时间。同步时间决定了自动传动系统换挡执行机构的能力。现有的测量这一时间的方法只考虑一个转动惯量,因此不能应用于同步器两侧有湿式多片离合器的拖拉机的动力换挡变速器(PST)。考虑轴向力随时间变化为一阶函数,并考虑轮毂和齿轮的等效转动惯量,预测PST同步时间。首先,我们推导了同步时间的解析方程。然后,我们建立了一个多体动力学(MBD)模型,其中包括湿式多片离合器的拖动扭矩。MBD模型由同步器、连杆机构和换挡执行机构输出轴作为刚体系统组成。在两个换挡阶段对同步器进行了功率换挡测试,要求系统的最大换挡力。测量了换挡执行机构的扭矩(换挡系统的输入)和换挡执行机构输出轴的角位移(换挡系统的输出)。然后将仿真模型的结果与位移试验的结果进行了比较。与试验结果比较,仿真结果在7.63%的精度范围内,基于换挡执行器的扭矩最大值。该方程在8.25%的最大误差范围内得到了验证。由于湿式多片离合器的拖拽力矩远远小于目标换挡系统中同步器的锥面力矩,因此该方程没有考虑湿式多片离合器的拖拽力矩。所提出的方程可以减少计算时间,并在自动变速器的早期设计阶段实现更精确的同步器和换挡执行器的尺寸。关键词:多体动力学,动力换挡,同步时间,同步器,拖拉机传动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction of Synchronization Time for Tractor Power-Shift Transmission Using Multi-Body Dynamic Simulation
HighlightsPrediction of synchronization time was performed for a power-shift transmission.We derived an analytical equation for synchronization time and developed a multi-body dynamics model.Model results were compared with results of a power-shift test on a synchronizer.Reduced computation and design time was achieved for automatic transmission design.Abstract. Synchronization time determines the capacity of a shift actuator for an automatic transmission system. Existing approaches for measuring this time only consider one rotational inertia and therefore cannot be applied to the power-shift transmission (PST) of a tractor with wet multi-plate clutches on both sides of the synchronizer. This study aims to predict the PST synchronization time by considering time-varying axial forces as first-order functions and the equivalent rotational inertias of the hub and the gear. First, we derive an analytical equation for the synchronization time. We then develop a multi-body dynamics (MBD) model that includes the drag torque of the wet multi-plate clutches. The MBD model is composed of a synchronizer, a linkage, and an output shaft of a shift actuator as a rigid-body system. A power-shift test was performed on the synchronizer at two shift stages requiring the maximum shift force of the system. The torque of the shift actuator (the input of the shift system) and the angular displacement of the output shaft of the shift actuator (the output of the shift system) were measured. The results of the simulation model were then compared with those of the shift test. Compared with the test results, the simulation results were validated within 7.63% accuracy, based on the maximum value for the torque of the shift actuator. The proposed equation was validated within a maximum error range of 8.25%. The proposed equation did not consider drag torque of the wet multi-plate clutches because that torque is much smaller than the cone torque of the synchronizer in the target shift system. The proposed equation can reduce computation time and will enable more precise sizing of the synchronizer and shift actuator in the early design stages of automatic transmissions. Keywords: Multi-body dynamics, Power-shift transmission, Synchronization time, Synchronizer, Tractor transmission.
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来源期刊
Transactions of the ASABE
Transactions of the ASABE AGRICULTURAL ENGINEERING-
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.
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