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Study on Dynamic of Harmonic Drive with Composite Material Layer

Author: YanFeng
Tutor: YangWei
School: Chongqing University
Course: Vehicle Engineering
Keywords: Harmonic Drive Flexspline Transient Analysis Composite OptimizationDesign
CLC: U463.218
Type: Master's thesis
Year: 2013
Downloads: 6
Quote: 0
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Abstract


Harmonic gear transmits power by means of the elastic deformation waves of theflexible components during transmission process. It has the features such as simplestructure, less parts, small in size, more simultaneous meshing teeth, high precision,little backlash, high load-capacity and a large range of transmission ratio. Affected bythe load in the process of transmission, flexspline deforms periodically, what is more,the mesh load is non-uniform distributed along the circumference, and does not tangentto the center line of the flexspline. Because the circumferential torsion and radialdeformation of the flexspline are existed at the same time, it is easy to be damaged byfatigued resulting from the action of alternating stress. Aiming at solving the problem offatigue damage of harmonic drive, the transient analysis of harmonic drive under loadcondition has obtained been carried out. On the basis of the results of transient analysis,the influence laws that how composite layers which have different aspect ratios effecton the stress and strain of the flexspline are studied. The principal researches are asfollows：1）The transient dynamic analysis of the harmonic drive is researched under themaximum load condition. The transient damping ratio of the system is optimized bymeans of dynamic relaxation method. The displacement deformation regularity offlexspline under the action of elliptical cam wave generator and the trajectory offlexspline is studied. The results are shown that stress distribution of flexspline is notsymmetrical with the long axis of wave generator but with the center of wave generatorunder the simultaneous affection of wave generator and load, namely, flexsplinedeforms, and because of the torsional deflection of flexspline, the maximum stress isappeared on the dedendum of flexspline, while, stress of the cup bodies is relativelylower.2）According to the meshing force status and deformation of the flexspline underthe rated operating conditions, the bending stiffness optimization model of symmetrycomposite laminates has been established by means of equivalent bending stiffnessmethod, and the optimal bending lamination parameters are obtained.3）The optimized model of the ply angles of symmetry composite laminates isestablished with the method of genetic algorithm after determining the thickness, layernumber and loading conditions of composite layer. Then the stacking sequence of composite laminate plates with optimal flexural rigidity are obtained.4）Finally, the composite flexspline which has different layer sizes is designed, andthe stress and strain distribution laws of flexspline under rated load condition arestudied. The result shows that the maximum equivalent stress reduced by3%when thelength of composite layers are all10mm, but the maximum stress of flexspline isreduced to10.5%when the circumferential length of composite layers increases to25mm, and the maximum stress is still located at the dedendum of flexspline and closedto the bottom side. The strain of flexspline has decreased by37.4%after addedcomposite materials, but as laminated size increased, the descent rate of maximumequivalent strain is diminished.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Transmission > Mechanical transmission > Drive axle
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