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Related Experiment Video

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Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

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Study on precision reliability evaluation method of harmonic drive based on NIPCE considering wear.

Xian Zhang¹, Changming Zhang², Peng Wang²

¹School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong, 723001, China. zhangxian_0905@sina.com.

Scientific Reports

|April 25, 2025

Summary

This study introduces a new method to evaluate harmonic drive precision reliability, considering wear for better failure prediction and maintenance. The approach accurately estimates reliability, confirming its effectiveness against test data.

Keywords:

Contact pair wear Harmonic drive NIPCE Precision dynamic reliability Sparse grid

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Published on: June 4, 2020

Area of Science:

Mechanical Engineering
Reliability Engineering
Tribology

Background:

Harmonic drives are crucial in precision applications.
Wear-induced precision degradation is a key failure mode.
Accurate reliability evaluation is needed for proactive maintenance.

Purpose of the Study:

To propose a dynamic reliability evaluation method for harmonic drive precision, considering wear.
To enable precise estimation of reliability for failure prediction and maintenance.
To analyze the impact of different wear components on overall precision reliability.

Main Methods:

Established a dynamic model of harmonic drives incorporating contact pair wear.
Utilized Non-Intrusive Polynomial Chaos Expansion (NIPCE) for uncertainty analysis of the dynamic model.
Improved uncertainty analysis efficiency using sparse grids.
Developed a precision dynamic reliability evaluation method using an explicit surrogate model derived from polynomial chaos expansion and Monte Carlo simulation.

Main Results:

The wear between the flexspline (FS) and Circular Spline (CS) significantly impacts precision reliability more than FS and Wave Generator (WG) wear.
The proposed method's precision dynamic reliability trends align with experimental precision degradation test results.
The effectiveness of the dynamic reliability evaluation method considering wear was verified.

Conclusions:

The developed method provides accurate dynamic reliability evaluation for precision harmonic drives.
Understanding wear's impact on specific components (FS/CS vs. FS/WG) is critical for reliability assessment.
This approach supports enhanced failure prediction and proactive maintenance strategies in precision engineering.