螺栓联接结合面动态特性研究

发布时间：2018-03-13 17:10

本文选题：螺栓联接　切入点：结合面　出处：《中北大学》2011年硕士论文　论文类型：学位论文

【摘要】：本文研究了螺栓联接结合面的多种有限元模型建模方法,探讨了不同模型对螺栓联接整体结构有限元分析结果的影响规律,针对其中两种主要建模方式,采用参数优化识别技术,提取了螺栓联接结合面单位面积的刚度和阻尼参数值,深入考察了相关参数在不同结合界面条件下的动态特性及其在螺栓预紧力变化条件下的变化规律。主要研究内容如下: (1)对螺栓联接结构进行了试验模态分析,得到了螺栓联接结构在不同结合面介质条件和螺栓预紧力下的动态特性参数,为螺栓联接结合面动态特性参数的识别和各类有限元模型的建立提供了参考依据。 (2)采用刚度矩阵单元建立了螺栓联接结合面的等效动力学模型,以试验模态分析的结果为依据,基于遗传算法利用有限元分析与试验模态分析相结合的方法识别得到了螺栓联接结合面单位面积刚度和阻尼值,并分析了这些参数在结合面不同结合介质条件下的动态特性及其在螺栓预紧力变化条件下的变化规律。 (3)为了更加准确的模拟螺栓联接结合面的动态特性,创建了一种新的结合面有限单元,对其进行了单元特性分析,得到了单元刚度矩阵,并基于该单元重新建立了螺栓联接结合面的动力学建模,以此模型为基础对结合面接触刚度参数值进行了识别。然后分析了结合面单位面积接触刚度的动态特性及其在螺栓预紧力变化条件下的变化规律以及它对螺栓联接结构整体动态特性的影响规律。 (4)研究了螺栓联接结合面多种基于有限元的模拟方法,并针对性地建立了螺栓联接结构的动力学模型,对其进行了有限元模态计算,然后对计算结果进行了对比研究。最后,基于研究的结果,以试验模态分析的数据为依据,分析了在不同的结合面介质条件和不同的螺栓预紧力矩下各种结合面有限元模拟方法对螺栓联接整体结构有限元模型计算结果的影响,并据此探讨了这些结合面有限元模拟方法对其动态特性的模拟精度及其适用范围和条件。
[Abstract]:In this paper, a variety of finite element modeling methods for bolted joints are studied, and the effects of different models on the results of finite element analysis of bolted joints are discussed. The stiffness and damping parameters per unit area of bolted joints are extracted by parameter optimization identification technique. The dynamic characteristics of the related parameters under different bonding interface conditions and the variation law of the bolt pre-tightening force were investigated. The main contents of the study are as follows:. 1) the experimental modal analysis of bolted connection structure is carried out, and the dynamic characteristic parameters of bolted connection structure under different interface medium conditions and bolt pretension force are obtained. It provides a reference for the identification of dynamic characteristic parameters of bolted joints and the establishment of various finite element models. (2) the equivalent dynamic model of bolted joint surface is established by using stiffness matrix element, which is based on the results of experimental modal analysis. Based on genetic algorithm, the unit area stiffness and damping value of bolted joints are obtained by combining finite element analysis with experimental modal analysis. The dynamic characteristics of these parameters in different bonding medium and the variation law of bolt pre-tightening force are analyzed. In order to simulate the dynamic characteristics of bolted joints more accurately, a new finite element is established, and the element stiffness matrix is obtained. Based on this unit, the dynamic modeling of bolted joint surface is established. On the basis of this model, the contact stiffness parameters of the joint face are identified, and the dynamic characteristics of the contact stiffness per unit area of the joint surface, the variation law of the contact stiffness under the condition of bolt pretightening force and its connection to the bolt are analyzed. The influence law of the whole dynamic characteristic of the connection structure. Finally, the dynamic model of bolted connection structure is established, the finite element modal calculation is carried out, and the results are compared. Based on the results of the study, based on the experimental modal analysis data, The influence of various finite element simulation methods on the finite element model of bolted connection is analyzed under different medium conditions and different pre-tightening moment of bolts. Based on this, the simulation accuracy, application range and conditions of these finite element simulation methods for the dynamic characteristics of the joints are discussed.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH131.3

【引证文献】