机械固定结合面刚度特性建模与应用研究

发布时间：2018-05-25 19:03

本文选题：机械固定结合面 + 接触分形　；参考：《华中科技大学》2011年硕士论文

【摘要】：机电装备中机械结合面特性对整机性能影响很大。统计表明,整机刚度的40%～60%来源于结合面,因此,机电装备研发中机械结合面刚度特性建模十分重要。本文在国家“高档数控机床与基础制造装备”科技重大专项“高速立卧式加工中心”项目支持下,对机械固定结合面刚度特性建模方法进行研究。主要研究工作包括: 首先系统总结了当前有关机械结合面特性的研究工作,分析了国内外不同研究方法的特点,针对已有研究工作的不足,确定了本文研究的方向和目标。本文结合G-W接触模型的配对统计规律和M-B接触模型的粗糙面分形特性,提出并建立了描述结合面几何特性的模型。该模型在相同分形维数条件下,具有单重分形特性;不同分形维数条件下,具有双重分形特性的特点。接着,在结合面配对接触几何特征模型的基础上,分析了微触点的弹塑性变形规律和尺寸分布规律,提出了一种机械固定结合面配对接触力学特征模型,该模型以解析形式给出结合面的法向接触刚度和切向接触刚度。为了便于数值分析应用,采用应变能法推导出了该模型的等效虚拟材料模型。最后,运用三维建模平台CATIA、SpaceClaim和有限元建模工具ABAQUS,考虑结合面刚度特性的影响,分别建立固定螺栓结合面样件动力学模型和固定导轨结合面样件动力学模型。通过实验测试,验证本文所提出相关模型的有效性。将本文提出的方法应用于高速卧式加工中心HMC80的动态特性研究工作中,检验了本文所研究方法的适用性。
[Abstract]:The characteristics of mechanical bonding surface have great influence on the whole machine performance in electromechanical equipment. Statistics show that 40% of the stiffness of the whole machine comes from the bonding surface, so it is very important to model the stiffness characteristics of the mechanical joint in the research and development of mechanical and electrical equipment. In this paper, under the support of the National "High-grade NC Machine tool and basic Manufacturing equipment" Science and Technology Major Project "High Speed horizontal Machining Center", the modeling method of stiffness characteristics of mechanical fixed joint surface is studied. The main research work includes: Firstly, this paper systematically summarizes the current research work on the characteristics of mechanical joints, analyzes the characteristics of different research methods at home and abroad, and determines the direction and goal of this study in view of the shortcomings of the existing research work. Based on the pairing statistics of G-W contact model and the fractal characteristics of rough surface of M-B contact model, a model to describe the geometric properties of the contact surface is proposed and established in this paper. The model has single multifractal property under the same fractal dimension condition and double fractal characteristic under different fractal dimension condition. Then, on the basis of the contact geometry characteristic model, the elastic-plastic deformation law and the size distribution law of the microcontact are analyzed, and a mechanical contact mechanical characteristic model of the fixed contact surface is proposed. The normal contact stiffness and tangential contact stiffness of the combined plane are given in analytical form. In order to facilitate numerical analysis and application, the equivalent virtual material model is derived by strain energy method. Finally, using the three-dimensional modeling platform CATIAN SpaceClaim and finite element modeling tool Abaqus, considering the effect of the stiffness characteristics of the interface, the dynamic models of the fixed bolt joint surface and the fixed guide rail joint surface are established respectively. The experimental results show that the proposed model is effective. The method proposed in this paper is applied to the study of dynamic characteristics of HMC80 in high speed horizontal machining center, and the applicability of the method studied in this paper is tested.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH122

【引证文献】