谐波减速器弹性薄壁构件的疲劳寿命分析
发布时间：2018-09-12 17:28
【摘要】：谐波齿轮传动相对于传统传动方式而言具有众多优点,因此,在工业领域的应用越来越广泛,尤其在航空、汽车制造、医疗器材等精密机械传动领域。但谐波齿轮传动的关键部件柔轮是一弹性薄壁构件,其动态特性和寿命一直是制约谐波齿轮传动性能的主要因素。因此,对柔轮的动态特性和疲劳寿命研究具有重大的理论意义和实用价值。本文在国家自然科学基金项目资助下(资助号:50975295),对谐波减速器弹性薄壁构件柔轮进行了研究,掌握了柔轮的动态特性和各工况下的动态应变,在此基础上对柔轮进行了疲劳损伤分析,并预测了柔轮的疲劳寿命。 以XB-50-80型谐波减速器为研究对象,对其关键部件——杯型柔轮进行有限元建模,并进行有限元模态分析和实验测试,得到柔轮前四阶自由模态振型和固有频率。分析其振型的变形规律和频率对谐波减速器工作的影响,结果表明柔轮的振形主要表现为柔轮杯口的径向拉伸和杯底轴向拉伸和弯曲。在谐波减速器工作各工况中,不会激起柔轮的固有振型。 在柔轮内壁的中部和底部布置应变片,设定工况分别为300r/min空载、300r/min满载、1000r/min空载和1000r/min满载,测试柔轮的动态应变。实验测试采用美国SRI-PMD无线测试设备,采样频率设为2378Hz。测试结果表明:柔轮的动态应变呈周期性变化,其变化频率为减速器输入轴和输出轴旋转频率的叠加,应变较大值出现在柔轮底部沿杯底的径向,最大应变幅值接近10000με。转速和载荷对柔轮中部的应变影响不大,但柔轮底部的应变受载荷影响较大,载荷增加应变增加。 建立谐波减速器的冲击-动力接触模型,利用LS-DYNA分析软件对谐波减速器进行了瞬态分析,利用VPG有限元分析软件对柔轮的进行疲劳损伤分析,并对其寿命进行了预测。在设定减速器输入转速为1000r/min,载荷为额定载荷时,得到柔轮的最初疲劳位置为轮齿齿根和齿顶部位,损伤情况由轮齿内侧沿轴线向底部延伸。另外,杯底部位由于受到输出轴的扭转而产生较大的扭伤。
[Abstract]:The harmonic gear transmission has many advantages compared with the traditional transmission mode. Therefore, it is more and more widely used in the industrial field, especially in the field of precision mechanical transmission such as aviation, automobile manufacturing, medical equipment and so on. But the key component of harmonic gear transmission is flexible wheel which is an elastic thin-walled component. Its dynamic characteristics and life are the main factors restricting the performance of harmonic gear transmission. Therefore, it is of great theoretical significance and practical value to study the dynamic characteristics and fatigue life of flexible wheel. In this paper, supported by the National Natural Science Foundation of China (Grant No.: 50975295), the elastic thin-walled flexible wheel of harmonic reducer is studied, and the dynamic characteristics of the flexible wheel and the dynamic strain under various working conditions are mastered. On this basis, fatigue damage analysis of flexible wheel is carried out, and fatigue life of flexible wheel is predicted. Taking the XB-50-80 harmonic reducer as the research object, the finite element modeling of its key component, cup flexible wheel, is carried out, and the first four free mode modes and natural frequencies are obtained by finite element modal analysis and experimental test. The influence of the deformation law and frequency of the vibration mode on the work of harmonic reducer is analyzed. The results show that the vibration shape of the flexible wheel is mainly the radial drawing of the cup mouth and the axial drawing and bending of the cup bottom. In the harmonic reducer working conditions, will not arouse the inherent mode of flexible wheel. Strain gauges are arranged in the middle and bottom of the inner wall of the flexure wheel under the setting conditions of 300r / min full load 300r/min and 1000r / min 1000r/min full load respectively. The dynamic strain of the flexible wheel is measured. The SRI-PMD wireless testing equipment is used in the experiment, and the sampling frequency is 2378 Hz. The test results show that the dynamic strain of the flexible wheel changes periodically, and the variation frequency is the superposition of the rotation frequency of the input shaft and the output shaft of the reducer. The larger strain appears in the radial direction of the bottom of the flexible wheel along the bottom of the cup, and the maximum strain amplitude is close to 10000 渭 蔚. The rotation speed and load have little effect on the strain in the middle of the flexible wheel, but the strain at the bottom of the flexible wheel is greatly affected by the load, and the strain increases with the increase of load. The impact dynamic contact model of harmonic reducer is established. The transient analysis of harmonic reducer is carried out by using LS-DYNA analysis software. The fatigue damage analysis of flexible wheel is carried out by using VPG finite element analysis software, and its life is predicted. When the input speed of the reducer is set at 1000r / min and the load is rated, the initial fatigue position of the flexible wheel is the root of the gear tooth and the top part of the tooth, and the damage extends from the inside of the gear tooth to the bottom along the axis. In addition, the bottom of the cup due to the torsion of the output shaft to produce a greater sprain.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.46
本文编号：2239730
[Abstract]:The harmonic gear transmission has many advantages compared with the traditional transmission mode. Therefore, it is more and more widely used in the industrial field, especially in the field of precision mechanical transmission such as aviation, automobile manufacturing, medical equipment and so on. But the key component of harmonic gear transmission is flexible wheel which is an elastic thin-walled component. Its dynamic characteristics and life are the main factors restricting the performance of harmonic gear transmission. Therefore, it is of great theoretical significance and practical value to study the dynamic characteristics and fatigue life of flexible wheel. In this paper, supported by the National Natural Science Foundation of China (Grant No.: 50975295), the elastic thin-walled flexible wheel of harmonic reducer is studied, and the dynamic characteristics of the flexible wheel and the dynamic strain under various working conditions are mastered. On this basis, fatigue damage analysis of flexible wheel is carried out, and fatigue life of flexible wheel is predicted. Taking the XB-50-80 harmonic reducer as the research object, the finite element modeling of its key component, cup flexible wheel, is carried out, and the first four free mode modes and natural frequencies are obtained by finite element modal analysis and experimental test. The influence of the deformation law and frequency of the vibration mode on the work of harmonic reducer is analyzed. The results show that the vibration shape of the flexible wheel is mainly the radial drawing of the cup mouth and the axial drawing and bending of the cup bottom. In the harmonic reducer working conditions, will not arouse the inherent mode of flexible wheel. Strain gauges are arranged in the middle and bottom of the inner wall of the flexure wheel under the setting conditions of 300r / min full load 300r/min and 1000r / min 1000r/min full load respectively. The dynamic strain of the flexible wheel is measured. The SRI-PMD wireless testing equipment is used in the experiment, and the sampling frequency is 2378 Hz. The test results show that the dynamic strain of the flexible wheel changes periodically, and the variation frequency is the superposition of the rotation frequency of the input shaft and the output shaft of the reducer. The larger strain appears in the radial direction of the bottom of the flexible wheel along the bottom of the cup, and the maximum strain amplitude is close to 10000 渭 蔚. The rotation speed and load have little effect on the strain in the middle of the flexible wheel, but the strain at the bottom of the flexible wheel is greatly affected by the load, and the strain increases with the increase of load. The impact dynamic contact model of harmonic reducer is established. The transient analysis of harmonic reducer is carried out by using LS-DYNA analysis software. The fatigue damage analysis of flexible wheel is carried out by using VPG finite element analysis software, and its life is predicted. When the input speed of the reducer is set at 1000r / min and the load is rated, the initial fatigue position of the flexible wheel is the root of the gear tooth and the top part of the tooth, and the damage extends from the inside of the gear tooth to the bottom along the axis. In addition, the bottom of the cup due to the torsion of the output shaft to produce a greater sprain.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.46
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