基于振动速度与噪音的横梁动态特性优化
Optimization of Beam Dynamic Characteristics Based on Vibration Velocity and Noise
叶寒 1高艺 1刘军 1张军 2李莉 2刘旭波 1李诗晨 1董高翔 1姜乐付 1郭俊辉 2刘华2
作者信息
- 1. 南昌大学 先进制造学院,江西 南昌 330009
- 2. 江西省佳时特数控有限公司,江西 南昌 330052
- 折叠
摘要
针对某型小五轴高精密数控机床加工精度不高的问题,对其横梁的动态性能进行研究.采用锤击模态测试实验与有限元模拟计算相结合的方法,对横梁的固有频率进行研究;测量主轴不同转速下的振动速度和振动噪音,通过赋权处理,建立振动评价指标方程,得到优化目标;对所研究横梁进行形状优化.试验与仿真所得固有频率最大误差为5.76％;基于主轴振动情况确定83～117 Hz的频率范围,作为横梁设计时需要避开的低阶固有频率范围.经过形状优化后,横梁的一阶固有频率为139 Hz,相较于原横梁增加了约20.870％,横梁的动态性能得到改善.
Abstract
Aiming at the problem that of low machining accuracy of a certain type of small five-axis high-precision CNC machine tool is not high,the dynamics of its beam is studied.The natural frequency of the beam is studied by combining the hammering mode test experiment and finite element simulation calculation.Measure the vibration speed and vibration noise at different speeds of the spindle,and the vibration evaluation index equation is established through weighting processing to obtain the optimization target.The shape of the studied beam is optimized.The maximum error of the natural frequency obtained by the test and simulation is 5.76％,and the frequency range of 83～117 Hz is determined based on the spindle vibration,which is the low-order natural frequency range that needs to be avoided in the design of the beam.After shape optimization,the first-order natural frequency of the beam is 139 Hz,which is an increase of about 20.870％compared with the original beam,and the dynamics of the beam is improved.
关键词
动态性能/模态测试实验/有限元/赋权处理/振动评价指标Key words
dynamics/modal test experiments/finite elements/empowerment processing/vibration evaluation index引用本文复制引用
基金项目
小型立式五轴加工中心研发项目(HX202302170001)
出版年
2024
国家科技期刊平台
NSTL
万方数据