本文選題：螺栓聯(lián)接梁 + 結(jié)合部��； 參考：《東北大學》2012年碩士論文

【摘要】：螺栓聯(lián)接是機械結(jié)構(gòu)系統(tǒng)中最常見的聯(lián)接形式之一,通常情況下,螺栓聯(lián)接結(jié)構(gòu)的結(jié)合部會對系統(tǒng)的動力學特性產(chǎn)生很大的影響。與剛性聯(lián)接對照,結(jié)合部的力學特性參數(shù)會使結(jié)構(gòu)的固有頻率、剛度和阻尼等發(fā)生改變,而表現(xiàn)出非線性動力學特性。因此,為了精確的分析螺栓聯(lián)接結(jié)構(gòu)的動力學特性,預(yù)測其振動響應(yīng),有必要創(chuàng)建螺栓聯(lián)接結(jié)構(gòu)系統(tǒng)的非線性動力學模型,并辨識結(jié)合部的動力學特性參數(shù)(主要是剛度和阻尼參數(shù))。本文以螺栓聯(lián)接梁為例,主要研究螺栓聯(lián)接結(jié)構(gòu)結(jié)合部對系統(tǒng)動力學特性的影響,以及辨識結(jié)合部的動力學特性參數(shù)的方法。 首先,對非線性系統(tǒng)的辨識方法進行分類概述,介紹多種不同的非線性參數(shù)辨識方法,提出通用的辨識流程,為螺栓聯(lián)接梁的非線性參數(shù)辨識提供技術(shù)參考。 其次,對螺栓聯(lián)接梁結(jié)構(gòu)進行非線性表征測試,介紹檢測原理以及相應(yīng)的測試實施方法,搭建針對螺栓聯(lián)接梁結(jié)構(gòu)的振動測試系統(tǒng),并分別采用諧波失真、相干函數(shù)和頻響函數(shù)三種方法檢測螺栓聯(lián)接梁非線性的存在性及其特征。 然后,在表征測試和機理分析的基礎(chǔ)上,采用并聯(lián)的Iwan模型模擬接觸面之間的非線性動力學現(xiàn)象,對懸臂螺栓聯(lián)接梁,提出用Duffing方程描述螺栓結(jié)合部的動力學特性,建立非線性解析模型。結(jié)合實驗測試,用改進的力映射狀態(tài)法(Force-state mapping method)識別出了螺栓聯(lián)接梁結(jié)合部的剛度和阻尼參數(shù)。 最后,研究了從頻域辨識螺栓聯(lián)接梁結(jié)合部參數(shù)的方法�；谡駝恿豪碚�,建立螺栓聯(lián)接梁的兩自由度非線性模型,定義結(jié)合部的連續(xù)性條件,采用經(jīng)典的多尺度法對模型的四階偏微分方程進行半解析求解,獲得線性項的解析解和非線性項的頻率響應(yīng)函數(shù)。并在實驗的基礎(chǔ)上分別辨識出模型中的線性參數(shù)和非線性參數(shù),獲得完整的兩自由解析模型,進而辨識出螺栓聯(lián)接梁結(jié)合部的動力學特性。 本文是從非線性振動學理論出發(fā),在創(chuàng)建螺栓聯(lián)接梁非線性動力學模型的基礎(chǔ)上,分別研究從時域和頻域辨識其結(jié)合部動力學特性參數(shù)的方法。所提出的技術(shù)思路和方法可以作為辨識其他組合結(jié)構(gòu)非線性動力學特性的參考。
[Abstract]:Bolt connection is one of the most common connection forms in mechanical structure system. In general, the joint of bolt connection structure will have a great influence on the dynamic characteristics of the system. Compared with rigid joints, the mechanical properties of the joints change the natural frequency, stiffness and damping of the structure, and exhibit nonlinear dynamic characteristics. Therefore, in order to accurately analyze the dynamic characteristics of bolted connection structure and predict its vibration response, it is necessary to establish a nonlinear dynamic model of bolted connection structure system. The dynamic characteristic parameters (stiffness and damping parameters) of the joint are identified. In this paper, the effect of bolted connection structure on the dynamic characteristics of the system and the method of identifying the dynamic characteristic parameters of the joint are mainly studied in this paper, taking the bolted connection beam as an example. Firstly, the identification methods of nonlinear systems are classified and summarized, various nonlinear parameter identification methods are introduced, and a general identification process is proposed, which provides a technical reference for nonlinear parameter identification of bolted connection beams. Secondly, the nonlinear characterization test of bolted connection beam structure is carried out, the detection principle and corresponding test implementation method are introduced, and the vibration testing system for bolted connection beam structure is built, and harmonic distortion is adopted respectively. Coherence function and frequency response function are used to detect the nonlinearity of bolted connection beam. Then, on the basis of characterization, testing and mechanism analysis, a parallel Iwan model is used to simulate the nonlinear dynamic phenomena between contact surfaces. For the cantilever bolt connection beam, the Duffing equation is proposed to describe the dynamic characteristics of the bolt joint. A nonlinear analytical model is established. Combined with the experimental results, the stiffness and damping parameters of the bolted connection beam are identified by the improved force mapping state mapping method (Force-state mapping method). Finally, the method of identifying the joint parameters of bolted connection beam in frequency domain is studied. Based on the vibration beam theory, a nonlinear model of two degrees of freedom for bolted connection beam is established, and the continuity condition of the joint is defined. The fourth order partial differential equation of the model is solved semi-analytically by the classical multi-scale method. The analytical solution of the linear term and the frequency response function of the nonlinear term are obtained. On the basis of experiments, the linear and nonlinear parameters of the model are identified, and the complete two-free analytical model is obtained, and then the dynamic characteristics of the bolted joint are identified. Based on the theory of nonlinear vibration and the establishment of nonlinear dynamic model of bolted connection beam, this paper studies the method of identifying the dynamic characteristic parameters of the joint from the time domain and the frequency domain, respectively. The proposed technical ideas and methods can be used as a reference for identifying nonlinear dynamic characteristics of other composite structures.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH131.3

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