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Nonlinear dynamics of harmonic drive considering pitch deviation

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A Correction to this article was published on 20 March 2023

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Abstract

Pitch deviation as a short periodic error affects the transmission stability of harmonic drive. A measurement method is proposed to obtain the pitch deviation of a harmonic drive based on extraction of tooth profile indexing information with discrete point datum of tooth profile projection. The measured pitch deviations are introduced to a simplified nonlinear dynamic equation ignoring the flexible deformation of flexspline. The transition process of nonlinear dynamics of the system with the change of comprehensive transmission error, torque and meshing frequency are investigated and compared the dynamic characteristics with the pitch deviation to those without pitch deviation. The characteristics of neighboring periodic motions appeared in the system which affect the transmission stability are discussed. Saddle-node bifurcation, doubling periodic bifurcation and inverse doubling periodic bifurcation are found in the system and their influences on the system motion are investigated. The exploration of the dynamic characteristics of harmonic drive from the perspective of nonlinear dynamics is helpful in the selection of system parameters for improving the transmission stability of harmonic drive.

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Acknowledgements

The authors are grateful for the financial support from Open Project of Enterprises Key Laboratory of High-performance Servo System in Guangdong Province, China (Grant No. HPSKL2021KT03), and many contributions and new ideas from Mr. Zhong Chengbo to our research in the paper.

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Correspondence to Jing-zhong Xing.

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The original online version of this article was revised as the name of the first author was incorrectly spelled Chen instead of Cheng

Appendix

Appendix

See Tables

Table 2 Measurement datum of pitch deviation for the flexspline

2 and

Table 3 Measurement datum of pitch deviation for the circular spline

3.

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Cheng, Zf., Shi, Lt., Xing, Jz. et al. Nonlinear dynamics of harmonic drive considering pitch deviation. Meccanica 57, 2885–2902 (2022). https://doi.org/10.1007/s11012-022-01605-6

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