摘要
为了提高自重式划船器的运动特性与力学性能,采用解析法建立了划船器的运动方程,获得了扶手、脚蹬、尾座的轨迹、速度和加速度等运动特性,并优化了划船器各杆件的长度尺寸,通过SolidWorks Motion软件对划船器进行运动学仿真。结果表明:仿真值与解析值高度吻合,验证了运动方程的准确性。经过对长度尺寸进行优化后,得到了划船器各杆件的最优长度L_(1)=225 mm,L_(2)=1 012 mm,L_(3)=820 mm,L_(4)=400 mm和L_(5)=1 010 mm。通过SolidWorks Simulation软件对划船器进行静力学仿真,获得往复周期内划船器最大应力存在的部位与出现的时刻,并优化了各杆件的截面尺寸。结果表明:整个往复周期内,最大应力的部位始终出现在扶手连架杆上;无论是后拉还是前推,扶手连架杆最大应力始终在距胸部最远位置时达到最大。经过对截面尺寸优化后,划船器整体自身质量减小到149.9 kg,最大应力为139.5 MPa,仍低于材料的屈服强度。
In this article,in order to improve the deadweight rowing machine's motion characteristics and mechanical properties,the analytical method is used to set up the motion equation of the rower;such motion characteristics as the trajectory,velocity and acceleration of the handrail,pedal and tailstock are worked out,and the length and size of the rower's each rod are optimized.The rower is subject to the motion simulation with the help of the SolidWorks Motion software.The results show that the simulated value is highly consistent with the analytical value,which has verified that the motion equation is accurate.After the optimization of length and size,the optimal length of the rower's each rod is L_(1)=225 mm,L_(2)=1012 mm,L_(3)=820 mm,L_(4)=400 mm and L_(5)=1 O10 mm.The rower is subject to the static simulation with the help of the SolidWorks Simulation software,so as to obtain the position and time of the maximum stress exerted on the rower in the reciprocating cycle,and then the section size of each rod is optimized.The results show that the maximum stress always occurs on the handrail connecting rod during the whole reciprocating cycle;the maximum stress on the handrail connecting rod always reaches the maximum at the farthest position from the chest,whether it is pulled back or pushed forward.Based on the optimized section size,the rower's overall mass reduces to 149.9 kg,and the maximum stress is 139.5 MPa,which is still less than the yield strength of the material.
作者
贺占亮
HE Zhanliang(School Physical and Health Education,Xinxiang Vocational and Technical College,Xinxiang 453000)
出处
《机械设计》
CSCD
北大核心
2023年第5期108-115,共8页
Journal of Machine Design
基金
新乡市政府决策研究招标课题(B19013)。
关键词
自重式划船器
优化设计
运动特性
最大应力
仿真分析
deadweight rowing machine
optimal design
motion characteristic
maximum stress
simulation and analysis
