基于双向渐进结构优化法的油茶籽脱壳机辊筒的拓扑优化设计
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摘要
辊筒是油茶籽脱壳机中的关键部件,辊筒的设计水平对脱壳机脱壳的质量与产量起到关键作用。对于目前存在的辊筒质量偏重、转动惯量过大的设计问题,应用双向渐进结构优化法(BESO)设计辊筒的新结构。对油茶籽脱壳机的辊筒建立了结构拓扑优化的数学模型,使用Abaqus进行了仿真实验,编写Python优化程序对模型进行了结构优化。根据优化结果结合仿真实验设计出了新辊筒。在同样载荷约束下,通过对比优化前后两种辊筒的应力与位移,新辊筒的应力分布更加均匀,新辊筒在强度、刚度允许的前提下,其体积、质量比原辊筒减少了37. 2%,降低了辊筒的材料成本;转动惯量减小31. 8%,使其启动和制动时间更短,同时可以选择功率更小的电机,有效减少了整机耗电量。该方法为后续辊筒的设计提供了新的思路。
Roller is the key component of dehulling machine for oil-tea camellia seed. The design level of roller plays a key role in the quality and output of dehulling machine. For the existing design problems of heavy weight and excessive moment of inertia of roller,the new structure of the roller was designed by the bidirectional progressive structural optimization( BESO) method. The mathematical model of topology optimization for the roller of dehulling machine for oil-tea camellia seed was established. Simulation experiment was carried out using Abaqus,and the model structural was optimized by the Python optimization program. According to the optimization results and simulation experiment,new roller was designed. Under the same load constraint,comparing the stress and displacement of the rollers before and after optimization,the stress distribution of new roller was more uniform. When the strength and stiffness of the new structure was within the allowable range,the volume and mass of the new roller reduced by 37. 2% compared with those of the original roller,so the material cost of the roller was reduced. The moment of inertia of roller decreased by 31. 8%,and the starting and braking time were shorter,at the same time,a smaller power motor could be selected to effectively reduce the power consumption of the whole machine. The method provided a new idea for the design of the subsequent roller.
Roller is the key component of dehulling machine for oil-tea camellia seed. The design level of roller plays a key role in the quality and output of dehulling machine. For the existing design problems of heavy weight and excessive moment of inertia of roller,the new structure of the roller was designed by the bidirectional progressive structural optimization( BESO) method. The mathematical model of topology optimization for the roller of dehulling machine for oil-tea camellia seed was established. Simulation experiment was carried out using Abaqus,and the model structural was optimized by the Python optimization program. According to the optimization results and simulation experiment,new roller was designed. Under the same load constraint,comparing the stress and displacement of the rollers before and after optimization,the stress distribution of new roller was more uniform. When the strength and stiffness of the new structure was within the allowable range,the volume and mass of the new roller reduced by 37. 2% compared with those of the original roller,so the material cost of the roller was reduced. The moment of inertia of roller decreased by 31. 8%,and the starting and braking time were shorter,at the same time,a smaller power motor could be selected to effectively reduce the power consumption of the whole machine. The method provided a new idea for the design of the subsequent roller.
引文
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[2]钟旭美,张百刚,朱杰.我国油茶籽的综合利用[J].粮油食品科技,2007,15(2):34-36.
[3]黄凤洪,李文林,夏伏建,等.油茶籽脱壳机的研制与应用[J].农业工程学报,2006,22(11):147-151.
[4]隋允康,叶红玲,杜家政.结构拓扑优化的发展及其模型转化为独立层次的迫切性[J].工程力学,2005,22(S1):107-118.
[5]郭中泽,张卫红,陈裕泽.结构拓扑优化设计综述[J].机械设计,2007,24(8):1-6.
[6]李文林.油茶籽低温压榨吸附精炼技术与设备研究[D].北京:中国农业科学院,2016.
[7]张洁,徐伟民,何东平.文冠果破壳力影响因素的研究[J].中国油脂,2016,41(3):100-102.
[8]谢亿民,杨晓英,STEVEN G P,等.渐进结构优化法的基本理论及应用[J].工程力学,1999,16(6):70-81.
[9]任高晖.基于BESO法的结构拓扑优化研究及应用[D].哈尔滨:哈尔滨工程大学,2016.
[10]LI Q,STEVEN G P,XIE Y M.A simple checkerboard suppression algorithm for evolutionary structural optimization[J].Struct Multidiscip O,2001,22(3):230-239.