山地烤烟苗期揭膜机机架结构优化

Optimization Design of Mountain Flue-cured Tobacco Seedling Plastic MulchRemoving Machine Chassis' Structure Based on ANSYS Workbench

为降低山地烤烟苗期揭膜机机架质量,本文通过DesignModeler建立了山地烤烟苗期揭膜机机架的几何模型,对揭膜机匀速作业和调头两种工况下的机架进行了应力分析,采用多目标遗传算法对机架结构进行了优化。结果表明:机架最大应力出现在揭膜机掉头工况下横梁方钢管与立柱连接处,应力值为123.89 MPa;优化后机架总质量为5.9564 kg,比优化前减轻了19.84%;优化后机架最大应力为129.84 MPa,虽比优化前略重,但远小于机架所用材料Q235的最大许用应力值235 MPa。

To reduce the mass of mountain flue-cured tobacco seedling plastic mulch removing machine chassis,the geometric model of mountain flue-cured tobacco seedling plastic mulch removing machine chassis was established by Design Modeler. Then the stress on the chassis in constant speed working condition and turn around condition was analyzed and the maximum stress of the chassis at the connection between steel beam and column in the turn around condition was obtained. The maximum stress was 123.89 MPa which was within the safty margin. The multi-objective genetic algorithms optimization method was used by putting the chassis＇ mass as objective function to optimize the structure of chassis in the turn around condition to obtain the optimal thickness of the key square steel tube＇s wall. The optimal mass of the chassis was 5.9564 kg which was decreased 19.84%. The maximum stress of chassis was 129.84 MPa which was less than 235MPa--the maximum allowable stress of Q235 which chassis used.