基于ABAQUS的圓柱滾子軸承動力學研究
發(fā)布時間：2018-09-17 19:05
【摘要】：滾動軸承作為旋轉(zhuǎn)機械中最重要的零部件,其運行狀態(tài)的好壞直接影響到整臺設備的性能和使用壽命。疲勞失效作為滾動軸承最常見的失效類型,最初來源于疲勞載荷下形成的次表面裂紋,后逐漸演化為宏觀的疲勞剝落。疲勞剝落的形成使?jié)L動軸承逐漸趨于失效并且伴隨著動力學性能的改變。因此,研究滾動軸承在完好和帶有缺陷狀態(tài)以及在不同轉(zhuǎn)速下的動力學特征,對于滾動軸承的故障機理研究和故障診斷具有十分重要的意義。本文主要研究內(nèi)容包括:(1)建立了基于ABAQUS/Explicit的單列圓柱滾子軸承有限元動力學分析模型�？偨Y了圓柱滾子軸承的運行狀況并確定其動力學仿真邊界條件,為了更接近軸承實際運行狀態(tài),在有限元模型的建立中未對滾動體進行任何自由度的約束。為了對單一滾動體-套圈接觸對的接觸力動態(tài)響應進行研究,模型采用面對面接觸和通用接觸結合的方式建立接觸關系并且通過對運轉(zhuǎn)過程中滾動體公轉(zhuǎn)和自轉(zhuǎn)轉(zhuǎn)速的分析驗證了該動力學模型的正確性。(2)分析了無缺陷滾子軸承在不同內(nèi)圈轉(zhuǎn)速下的動力學行為,包括軸承各部件運動學規(guī)律、等效應力分布、接觸應力分布和接觸狀態(tài)特點、參考點軸心軌跡變化以及外圈節(jié)點加速度響應。根據(jù)滾動體不同環(huán)形路徑的切應力分布和數(shù)值變化規(guī)律分析了軸承缺陷產(chǎn)生機理;通過對比分析單一滾動體-套圈接觸對接觸力分量變化,得出了接觸力分量隨滾動體位置的變化規(guī)律。(3)研究了不同轉(zhuǎn)速下外滾道帶有局部剝落缺陷的滾子軸承動力學行為。在無缺陷圓柱滾子軸承動力學仿真的基礎上,建立外圈承載區(qū)下端帶有局部剝落缺陷的動力學模型,并以此分析了不同轉(zhuǎn)速下滾動體進入、經(jīng)過和滾出剝落缺陷的動力學響應特性。根據(jù)滾動體-外圈接觸力歷程輸出和接觸力分量變化規(guī)律,確定滾子進入和滾出缺陷的時刻,并以此估計剝落缺陷的周向尺寸。
[Abstract]:As the most important parts in rotating machinery, the running state of rolling bearing directly affects the performance and service life of the whole equipment. As the most common failure type of rolling bearing, fatigue failure originates from the subsurface crack formed under fatigue load, and then evolves into macroscopic fatigue spalling. The formation of fatigue spalling makes rolling bearings tend to fail gradually and with the change of dynamic performance. Therefore, it is of great significance to study the dynamic characteristics of rolling bearings in intact and defective states and at different rotational speeds for the study of fault mechanism and fault diagnosis of rolling bearings. The main contents of this paper are as follows: (1) the finite element dynamic analysis model of single row cylindrical roller bearing based on ABAQUS/Explicit is established. The running condition of cylindrical roller bearing is summarized and its dynamic simulation boundary condition is determined. In order to get closer to the actual running state of the bearing, the rolling body is not constrained by any degree of freedom in the establishment of finite element model. In order to study the dynamic response of the contact force of a single rolling body-ring contact pair, The contact relationship is established by the combination of face to face contact and universal contact. The correctness of the dynamic model is verified by the analysis of the rolling body rotation and rotation speed. (2) the non-defect roller is analyzed. The dynamic behavior of bearings at different inner ring speeds, It includes the kinematics law of bearing components, equivalent stress distribution, contact stress distribution and contact state characteristics, the change of axis locus of reference point and acceleration response of outer ring joint. According to the shear stress distribution and numerical variation law of different annular paths of rolling body, the mechanism of bearing defect is analyzed, and the change of contact force component of single rolling body and ring contact is compared and analyzed. The dynamic behavior of roller bearing with local flaking defect in outer raceway under different rotational speeds is studied. On the basis of dynamic simulation of non-defect cylindrical roller bearing, a dynamic model with local flaking defects at the lower end of the outer ring bearing area is established, and the entry of the rolling body at different rotational speeds is analyzed. Dynamic response characteristics of exfoliating defects through and out. According to the relation between rolling body and outer ring contact force and the change of contact force component, the time of roller entering and rolling out of defect is determined, and the circumferential dimension of flaking defect is estimated.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH133.33
本文編號：2246822
[Abstract]:As the most important parts in rotating machinery, the running state of rolling bearing directly affects the performance and service life of the whole equipment. As the most common failure type of rolling bearing, fatigue failure originates from the subsurface crack formed under fatigue load, and then evolves into macroscopic fatigue spalling. The formation of fatigue spalling makes rolling bearings tend to fail gradually and with the change of dynamic performance. Therefore, it is of great significance to study the dynamic characteristics of rolling bearings in intact and defective states and at different rotational speeds for the study of fault mechanism and fault diagnosis of rolling bearings. The main contents of this paper are as follows: (1) the finite element dynamic analysis model of single row cylindrical roller bearing based on ABAQUS/Explicit is established. The running condition of cylindrical roller bearing is summarized and its dynamic simulation boundary condition is determined. In order to get closer to the actual running state of the bearing, the rolling body is not constrained by any degree of freedom in the establishment of finite element model. In order to study the dynamic response of the contact force of a single rolling body-ring contact pair, The contact relationship is established by the combination of face to face contact and universal contact. The correctness of the dynamic model is verified by the analysis of the rolling body rotation and rotation speed. (2) the non-defect roller is analyzed. The dynamic behavior of bearings at different inner ring speeds, It includes the kinematics law of bearing components, equivalent stress distribution, contact stress distribution and contact state characteristics, the change of axis locus of reference point and acceleration response of outer ring joint. According to the shear stress distribution and numerical variation law of different annular paths of rolling body, the mechanism of bearing defect is analyzed, and the change of contact force component of single rolling body and ring contact is compared and analyzed. The dynamic behavior of roller bearing with local flaking defect in outer raceway under different rotational speeds is studied. On the basis of dynamic simulation of non-defect cylindrical roller bearing, a dynamic model with local flaking defects at the lower end of the outer ring bearing area is established, and the entry of the rolling body at different rotational speeds is analyzed. Dynamic response characteristics of exfoliating defects through and out. According to the relation between rolling body and outer ring contact force and the change of contact force component, the time of roller entering and rolling out of defect is determined, and the circumferential dimension of flaking defect is estimated.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH133.33
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