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Fatigue Life Analysis on Elastic Thin-Wall Component of Harmonic Gear Drive

Author: PanYinLiang
Tutor: YangWei
School: Chongqing University
Course: Vehicle Engineering
Keywords: Harmonic Drive Flexspline Dynamic characteristic Strain Test Fatigue damage
CLC: TH132.46
Type: Master's thesis
Year: 2011
Downloads: 79
Quote: 0
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Abstract


Harmonic gear transmission has many advantages relative to traditional transmission mode, therefore, more and more widely in the industrial field, especially in aviation, automobile manufacturing, medical equipment and other precision mechanical transmission areas. However, the key components of the harmonic gear drive flexspline is a flexible thin-walled structures, dynamic characteristics and life has been a major factor in restricting the performance of the harmonic gear. Flexspline dynamic characteristics and fatigue life of great theoretical significance and practical value. (Funding No.: 50975295), the National Natural Science Foundation project funded flexspline of the harmonic reducer flexible thin-walled structures studied and mastered the the flexspline dynamic characteristics and conditions of dynamic strain, on this basis, on flexspline fatigue damage analysis and predict the fatigue life of flexible wheel. XB-50-80-type harmonic reducer and its key components - cup flexspline finite element modeling and modal finite element analysis and experimental testing, flexspline first four free module shapes and natural frequencies. Analysis of its modes of deformation and frequency of the harmonic reducer work, the results show that the the flexspline vibration shaped mainly for the flexspline cup radial stretch and the bottom of the cup axial tensile and bending. In the harmonic reducer work conditions will not arouse the flexspline the inherent vibration type. In the flexspline middle and bottom of the inner wall of the arrangement of strain gages, set conditions were 300r/min no-load, 300r/min full load, 1000r/min no load and 1000r/min fully loaded, dynamic strain testing flexspline. The experimental test using SRI-PMD wireless test equipment, the United States, the sampling frequency is set to 2378Hz. The test results show that: the flexspline the dynamic strain was cyclical changes, the variation frequency of the gear unit input shaft and output shaft rotational frequency of the superimposed strain large value appears in the bottom of the flexspline along the bottom of the cup radially, maximum strain amplitude close to 10000με. Speed ??and load of the impact of the flexspline central strain, but the strain of the bottom of the flexspline influenced by the load load increased strain increases. To establish harmonic reducer impact - the dynamic contact model harmonic reducer transient analysis using LS-DYNA analysis software, VPG finite element analysis software flexspline for fatigue damage analysis, and their life forecast. Flexspline initial fatigue position set the input rotational speed reducer 1000r/min, the load of the rated load, the tooth root and the tooth tip, the damage by the axis of the tooth along the inside to the bottom extension. In addition, bottom portion due to the torsion of the output shaft and have a greater sprain.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Reducer and transmission
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