摘要
考虑随机因素的影响，研究主轴受迫振动对车削精度可靠性的影响及随机参数的可靠性灵敏度。车床主轴加工时受到动态切削力作用，使主轴产生受迫振动。利用有限元方法计算主轴振动频率响应。考虑到加工过程切削参数的随机性影响，对切削参数进行随机抽样，计算不同参数条件下的频率响应。采用神经网络训练方法拟合频率响应与随机参数之间的关系式。建立车削加工时主轴受迫振动产生圆柱度误差的可靠性功能函数，并采用一次二阶矩法计算可靠度与随机参数的可靠性灵敏度。
Abstract
The effect on cutting precision reliability of the spindle forced vibration and reliability sensitivity of random parameters are studied in consideration of random factors. The forced vibration of lathe spindle takes place under the action of dynamic cutting force during cutting process. The frequency response of spindle is calculated through using finite element method. The randomness was taken into consideration of cutting parameters and the frequency responses were calculated in the condition of different parameters based on random sampling. The function expression between frequency response and random parameters was obtained by using the neural network training method. The reliability performance function was established of cylindricity error generated from forced vibration of spindle during turning process, and the reliability and reliability sensitivity were calculated based on linear second order moment method.
Key words
forced vibration /
reliability /
reliability sensitivity /
neural network /
linear second order /
momentapp:addword:linear second order moment
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张义民 曹辉 王昊 杨周.
基于主轴动态响应的车削加工精度可靠性及灵敏度分析[J]. 振动与冲击, 2015, 34(23): 14-17
ZHANG Yi-min CAO Hui WANG Hao YANG Zhou.
Reliability and reliability sensitivity analysis of turning precision based on spindle dynamic response[J]. Journal of Vibration and Shock, 2015, 34(23): 14-17
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