高速开盒机凸轮机构的动态特性分析及改进
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摘要
凸轮机构作为开盒机的主要机构,对其进行详尽的动态特性分析,将对开盒机的动态性能提升具有重要指导意义。将凸轮连杆和凸轮轴进行柔性化处理,建立凸轮机构的多柔体模型,对多刚体模型和多柔体模型的仿真结果进行了对比。基于多柔体模型,分析了输入转速、阻尼系数、材料参数和结构参数对机构动态性能的影响。结果表明,多柔体模型的仿真结果对开盒机的初始装配具有指导意义。减小凸轮厚度同时增大阻尼可以改善机构动态特性,使开盒机提速运行。同时,利用ANSYS对改变厚度后的凸轮进行模态分析,为避免共振和更为全面的动力学分析提供了依据。
As the main mechanism of the opener,the cam mechanism has detailed dynamic characteris-tics analysis,which will have important guiding significance for the dynamic performance improvement of theopener. The cam link and the camshaft are flexibly processed to create a multi-flexible body model of the cammechanism,and the simulation results of the multi-rigid body model and the multi-flexible body model arecompared. Based on the multi-flexible body model,the effects of input speed,damping coefficient,materialparameters and structural parameters on the dynamic characteristic of the mechanism are analyzed. The resultsshow that the simulation results of the multi-flexible model have guiding significance for the initial assembly ofthe opener. Reducing the cam thickness and increasing the damping can improve the dynamic characteristics ofthe mechanism and enable the opener to run at a faster speed. At the same time,using ANSYS to perform modalanalysis on the cam with varying thickness,a basis for avoiding resonance and more comprehensive dynamicanalysis is provided.
As the main mechanism of the opener,the cam mechanism has detailed dynamic characteris-tics analysis,which will have important guiding significance for the dynamic performance improvement of theopener. The cam link and the camshaft are flexibly processed to create a multi-flexible body model of the cammechanism,and the simulation results of the multi-rigid body model and the multi-flexible body model arecompared. Based on the multi-flexible body model,the effects of input speed,damping coefficient,materialparameters and structural parameters on the dynamic characteristic of the mechanism are analyzed. The resultsshow that the simulation results of the multi-flexible model have guiding significance for the initial assembly ofthe opener. Reducing the cam thickness and increasing the damping can improve the dynamic characteristics ofthe mechanism and enable the opener to run at a faster speed. At the same time,using ANSYS to perform modalanalysis on the cam with varying thickness,a basis for avoiding resonance and more comprehensive dynamicanalysis is provided.
引文
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[2]张策.机械动力学[M].北京:高等教育出版社,2008:237-430.
[3]何雪明,何楷,武美萍,等.基于冲击模型的含间隙高速凸轮机构动力学分析[J].食品与机械,2017,33(9):84-89.
[4]张兴钰,葛正浩,李成平,等.基于刚柔耦合模型的弧面分度凸轮机构动力学分析[J].机械传动,2016,40(1):136-139.
[5]金国光,秦凯旋,魏展,等.基于ADAMS的共轭凸轮打纬机构动态设计与仿真[J].天津工业大学学报,2016,35(1):65-69.
[6]魏展,金国光,袁汝旺,等.高速共轭凸轮打纬机构柔性动力学分析[J].机械工程学报,2017,53(3):81-89.
[7]田亚平,康军凤.阻尼对高速凸轮机构动力学的影响分析[J].机械传动,2010,34(3):59-61.
[8]陈立平,张云清,任卫群,等.机械系统动力学分析及ADAMS应用教程[M].北京:清华大学出版社,2005:56-62.
[9]万朝燕,李培行,庄绪红.基于ADAMS的凸轮机构弹性动力学分析[J].大连交通大学学报,2010,31(1):45-48.
[10]何海琴,李延平,常勇.基于Pro/E和ADAMS的新型凸轮机构建模及仿真分析[J].机械传动,2016,40(2):88-90.
[11]万晓文,王文格,席亮.高速共轭凸轮机构的动态特性分析[J].机械设计,2014,31(2):27-31.
[12]龙凯,程颖.齿轮啮合力仿真计算的参数选取研究[J].计算机仿真,2002(6):87-88.
[13]冯志友,汪梦.基于ANSYS的新型4自由度并联机构动态特性分析[J].机械设计,2016,33(3):88-91.