【摘要】：諧波齒輪傳動相對于傳統(tǒng)傳動方式而言具有眾多優(yōu)點,因此,在工業(yè)領(lǐng)域的應(yīng)用越來越廣泛,尤其在航空、汽車制造、醫(yī)療器材等精密機械傳動領(lǐng)域。但諧波齒輪傳動的關(guān)鍵部件柔輪是一彈性薄壁構(gòu)件,其動態(tài)特性和壽命一直是制約諧波齒輪傳動性能的主要因素。因此,對柔輪的動態(tài)特性和疲勞壽命研究具有重大的理論意義和實用價值。本文在國家自然科學(xué)基金項目資助下(資助號:50975295),對諧波減速器彈性薄壁構(gòu)件柔輪進行了研究,掌握了柔輪的動態(tài)特性和各工況下的動態(tài)應(yīng)變,在此基礎(chǔ)上對柔輪進行了疲勞損傷分析,并預(yù)測了柔輪的疲勞壽命。 以XB-50-80型諧波減速器為研究對象,對其關(guān)鍵部件——杯型柔輪進行有限元建模,并進行有限元模態(tài)分析和實驗測試,得到柔輪前四階自由模態(tài)振型和固有頻率。分析其振型的變形規(guī)律和頻率對諧波減速器工作的影響,結(jié)果表明柔輪的振形主要表現(xiàn)為柔輪杯口的徑向拉伸和杯底軸向拉伸和彎曲。在諧波減速器工作各工況中,不會激起柔輪的固有振型。 在柔輪內(nèi)壁的中部和底部布置應(yīng)變片,設(shè)定工況分別為300r/min空載、300r/min滿載、1000r/min空載和1000r/min滿載,測試柔輪的動態(tài)應(yīng)變。實驗測試采用美國SRI-PMD無線測試設(shè)備,采樣頻率設(shè)為2378Hz。測試結(jié)果表明:柔輪的動態(tài)應(yīng)變呈周期性變化,其變化頻率為減速器輸入軸和輸出軸旋轉(zhuǎn)頻率的疊加,應(yīng)變較大值出現(xiàn)在柔輪底部沿杯底的徑向,最大應(yīng)變幅值接近10000με。轉(zhuǎn)速和載荷對柔輪中部的應(yīng)變影響不大,但柔輪底部的應(yīng)變受載荷影響較大,載荷增加應(yīng)變增加。 建立諧波減速器的沖擊-動力接觸模型,利用LS-DYNA分析軟件對諧波減速器進行了瞬態(tài)分析,利用VPG有限元分析軟件對柔輪的進行疲勞損傷分析,并對其壽命進行了預(yù)測。在設(shè)定減速器輸入轉(zhuǎn)速為1000r/min,載荷為額定載荷時,得到柔輪的最初疲勞位置為輪齒齒根和齒頂部位,損傷情況由輪齒內(nèi)側(cè)沿軸線向底部延伸。另外,杯底部位由于受到輸出軸的扭轉(zhuǎn)而產(chǎn)生較大的扭傷。
[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.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.46

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