摘要
高速动平衡机摆架的动力学性能直接影响动平衡试验的准确性及安全性。采用三维有限元法建立某公司250 t高速动平衡机摆架的计算模型,并对其动刚度进行计算分析,且与试验值进行比较。在此基础上计算4种主刚度杆改进方案下摆架的动刚度特性,分析主刚度杆的刚度对高速动平衡机摆架的动刚度曲线的影响。结果表明,计算所得摆架的动刚度曲线与实测值吻合较好,该计算模型接近实际情况。主刚度杆的结构尺寸及材料的弹性模量的增大均会使摆架的动刚度增大,适当地改变主刚度杆的结构尺寸及材料特性,可使高速动平衡机摆架满足大质量转子的高速动平衡试验要求。通过主刚度杆的改进并不能使摆架的动刚度随转速变化的曲线趋于平缓。
The dynamic performance of high speed dynamic balancing machine directly affects the accuracy and safety of the dynamic balance test.The three-dimensional finite element method is adopted to numerically study the dynamic stiffness of a 250 t high speed dynamic balancing machine,which is compared with the experimental results.The dynamic stiffness characteristics of four improved models are evaluated,aiming to investigate how the stiffness of the main stiffness rod influences the dynamic performance of the machine.The results show that the calculated dynamic stiffness curves agree well with the experimental results.The dynamic stiffness of the machine increases with the increment of the structure size and material elastic modulus of the main stiffness rod;a suitable structure and material for the main stiffness rod enables the machine to meet the dynamic balance test requirements of the large-mass rotors.Improving the main stiffness rod cannot lead to a flat dynamic stiffness curve.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第1期75-79,共5页
Journal of Mechanical Engineering
基金
国家重点基础研究发展计划资助项目(973计划
2007CB707705)
关键词
高速动平衡机摆架
动刚度
有限元法
优化
High speed dynamic balancing machine Dynamic stiffness Finite element method Optimization
