基于结构拓扑优化的绣花机压脚与针杆机构结构优化
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摘要
针对高速绣花机的压脚机构及针杆机构加速度突变引起的过度柔性冲击和运动失衡问题,首先通过机构运动学求解绣花机压脚及针杆机构运动规律。进一步基于结构拓扑优化的独立、连续、映射的方法,采用有限元技术将离散变量因子转为连续函数,再通过映射反映在部件的子域(单元)有无上进行零件优化,对产生过度柔性冲击的主要部件进行受力分析,划分不同网格区域形成不同子域(单元),用拓扑变量来定义各子域中的质量因素,在质量平衡的基础上减少产生柔性冲击的主要部件质量。工程实例表明,该方法使结构设计满足轻质要求,可达到降低柔性冲击的效果。
Aiming at the excessive flexibility impact and the destruction of the steady state of the machine due to sudden acceleration change of the presser foot mechanism and needle bar mechanism of the high speed embroidery machine, the paper firstly analyzed the movement rule of the presser foot mechanism and needle bar mechanism under high speed based on kinematics. Further, according to the analysis of the motion rule, the structural topology optimization based on the independent continuous mapping and finite element technology were used in the presser foot mechanism and needle bar mechanism. The discrete variable factor was transformed into a continuous function, and then the part was optimized by mapping to reflect 0 or 1 in the parts of subdomains. Several main components with excessive flexible impact forces were studied. They were divided into different grid areas, named subdomains(unit). The quality factors of each subdomains were defined by using topology variables, and the mass of the major parts with a flexible impact was reduced on the basis of mass balance. The engineering examples show that this method can meet the requirements of light quality and reduce the effect of flexible impact.
Aiming at the excessive flexibility impact and the destruction of the steady state of the machine due to sudden acceleration change of the presser foot mechanism and needle bar mechanism of the high speed embroidery machine, the paper firstly analyzed the movement rule of the presser foot mechanism and needle bar mechanism under high speed based on kinematics. Further, according to the analysis of the motion rule, the structural topology optimization based on the independent continuous mapping and finite element technology were used in the presser foot mechanism and needle bar mechanism. The discrete variable factor was transformed into a continuous function, and then the part was optimized by mapping to reflect 0 or 1 in the parts of subdomains. Several main components with excessive flexible impact forces were studied. They were divided into different grid areas, named subdomains(unit). The quality factors of each subdomains were defined by using topology variables, and the mass of the major parts with a flexible impact was reduced on the basis of mass balance. The engineering examples show that this method can meet the requirements of light quality and reduce the effect of flexible impact.
引文
[1] 林建龙, 罗志文, 张力.电脑刺绣机针杆机构位置精度分析[J].纺织学报, 2010, 31(7): 131-134.LIN Jianlong, LUO Zhiwen, ZHANG Li. Position accuracy analysis on needle bar mechanism of computerized embroidery machine[J].Journal of Textile Research, 2010, 31(7): 131-134.
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[9] FENG M Q,KIM D K,YI J H,et al.Baseline models for bridge performance monitoring[J].Journal of Engineering Mechanics, 2004, 130(5): 562-569.
[10] 隋允康, 叶红玲, 彭细荣, 等.连续体结构拓扑优化应力约束凝聚化的ICM方法[J].力学学报, 2007, 39(4): 554-563.SUI Yunkang, YE Hongling, PENG Xirong, et al. The ICM method of continuous structure topological optimization stress constraint condensation[J].Chinese Journal of Theoretical and Applied Mechanics, 2007, 39(4): 554-563.
[2] 林建龙, 孟春林, 傅程,等.电脑刺绣机针杆机构质心轨迹研究[J].纺织学报, 2005, 26(1): 70-72.LIN Jianlong, MENG Chunlin, FU Cheng, et al. Research on the mass center curve of the needle bar mechanism in computerized embroidery machine[J].Journal of Textile Research, 2005, 26(1): 70-72.
[3] 林建龙, 王小北, 顾翔.新型电脑刺绣机挑线机构设计分析[J].纺织学报, 2006, 27(12): 105-108.LIN Jianlong, WANG Xiaobei, GU Xiang. Analysis and design of new model thread-taking-up mechanism of thecomputerized embroidery machine[J].Journal of Textile Research, 2006, 27(12): 105-108.
[4] 罗志文, 林建龙, 唐永龙.电脑刺绣机针杆机构力矩分析[J].纺织学报, 2009, 30(12): 113-116.LUO Zhiwen, LIN Jianlong, TANG Yonglong. Moment analysis of needle bar mechanism on computerized embroidery machine[J].Journal of Textile Research, 2009, 30(12): 113-116.
[5] 郭慧昕.刺绣机含间隙针杆机构的稳健性分析与优化设计[J].纺织学报, 2010, 31(7): 131-136.GUO Huixin. Position robust analysis and design optimization of needle bar mechanism with joint clearance of automatic embroidery machine[J].Journal of Textile Research, 2010, 31(7): 131-136.
[6] 彭细荣, 隋允康.基于ICM法的高层建筑大型支撑体系拓扑优化[J].工程力学, 2017, 34(5): 17-22.PENG Xirong, SUI Yunkang. Topology optimization of mega braced systems of high-rise buildings based on ICM method[J].Engineering Mechanics, 2017, 34(5): 17-22.
[7] BANERJEE S, CHI C, SHINOZUKA M K. Filter-based identification of bridge fragility parameters[C]//ASCE.Proceeding of the 2011 Structure Congress. Las Vegas: Structure Congress, 2011: 240-250.
[8] 叶红玲, 隋允康.基于ICM方法三维连续体结构拓扑优化[J].固体力学学报, 2006, 27(4): 387-393.YE Hongling, SUI Yunkang. ICM-based Topological optimization of three-dimentional continum structure[J]. Acta Mechanica Solida Sinica, 2006, 27(4): 387-393.
[9] FENG M Q,KIM D K,YI J H,et al.Baseline models for bridge performance monitoring[J].Journal of Engineering Mechanics, 2004, 130(5): 562-569.
[10] 隋允康, 叶红玲, 彭细荣, 等.连续体结构拓扑优化应力约束凝聚化的ICM方法[J].力学学报, 2007, 39(4): 554-563.SUI Yunkang, YE Hongling, PENG Xirong, et al. The ICM method of continuous structure topological optimization stress constraint condensation[J].Chinese Journal of Theoretical and Applied Mechanics, 2007, 39(4): 554-563.