摘要
为了研究双驱动进给系统的动态特性,利用能量法建立了双驱动进给系统多自由度模型。该方法考虑了丝杠螺母副,支撑轴承及直线滚动导轨结合面参数的影响;根据拉格朗日方程推导了双驱动进给系统的刚度,质量矩阵,工作台的位移计算公式;数值仿真计算出系统的固有频率,并对其影响规律进行了进一步分析;研究表明系统轴向刚度、工作台的质量和位置是影响一阶固有频率的主要因素,增大丝杠跨距可以抑制工作台的扭转振动。试验结果表明该动力学模型能够准确地反映系统的动态特性。
In order to study the dynamic characteristics of a dual drive feed system,a multi degrees of freedom model of the system was established by using the energy method. The method considers the influences of the screw nut pair,the support bearing and the joint surface parameters of the linear rolling guide rail. According to the Lagrange equation,the stiffness,mass matrix and displacement expression of the double drive feed system were derived. The natural frequency of the system was calculated by numerical simulation,and the influential factors on it were analyzed.The research shows that the axial stiffness of the system,the mass and position of the working table are the main factors affecting the first order natural frequency. Increasing the distance between the screws can suppress the torsional vibration of the working table. The experimental results show that the dynamic model can accurately reflect the dynamic characteristics of the system.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第18期148-153,163,共7页
Journal of Vibration and Shock
基金
江苏省自然科学基金(BK20141400)
国家科技重大专项(2015ZX04014021)
