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Simulation and Mechanical Stress Analysis of the Lower Link Arm of a Tractor Using Finite Element Method

机译：使用有限元法测定拖拉机下连杆臂的模拟与机械应力分析

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The lower link arms are used for attaching tools to agricultural tractors, and different forces act on those while working. Awareness about the safety and deformed shape of the lower link under these forces can help us to reduce failures and financial losses. In this study, the lower arms of MF399 and MF285 tractors were simulated and mechanical analysis was discussed using the finite element method. Three-dimensional models for both of the lower arms were designed using reverse engineering, and constraints, boundary conditions and loads were applied on the models considering the tensile force at the maximum work depth of the equipment. Then, the finite element method was used for static, modal and fatigue analysis in ANSYS software and then safety factor obtained for the lower arms. The FEM of static analysis results showed that the maximum value of Von-Mises stress occurred at the junction point of the lower arms to the attachments. These results indicate the lower arm is safe enough for working with a usual furrower and chisel plow, but while working with a drill planter, the possibility of breaking is higher. Also to prevent resonance frequency, the natural frequencies of the lower arms were calculated using modal analysis. Fatigue analysis for the lower arms showed that the probability of failure is high around the hole of inhibitory chains. These results can be useful to optimize design process of the lower arms.
机译：下部连杆臂用于将工具连接到农业拖拉机，不同的力量在工作时采取行动。对这些力下较低环节的安全性和变形形状的认识可以帮助我们减少失败和金融损失。在这项研究中，模拟了MF399和MF285拖拉机的下臂，并使用有限元方法讨论了机械分析。使用逆向工程设计了两个下臂的三维模型，并在考虑到设备的最大工作深度的拉伸力的模型上应用了约束，边界条件和载荷。然后，有限元方法用于ANSYS软件中的静态，模态和疲劳分析，然后用于下臂获得的安全系数。静态分析结果的有限元表明，von-mises应力的最大值发生在下臂的连接点到附件。这些结果表明，较低的臂足够安全，以便使用通常的皱纹和凿犁，但在使用钻机播种机的同时，突破的可能性更高。还要防止共振频率，使用模态分析计算下臂的固有频率。下臂的疲劳分析表明，抑制链孔周围的失效概率高。这些结果可用于优化下臂的设计过程。

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