Precision reduction drives
The gearboxes that let a robot joint move precisely and hold a load. A few Japanese firms set what is possible.
judged, with a citation claimed, no citationNumber: papers, preprints and grants the feeds collected — unreviewed
Searched for “harmonic drive”, “strain wave gear”, “cycloidal reducer”, “robot joint reducer” in titles and abstracts.
All stagesFundamental researchApplied / labPilot / demonstrationEarly commercialAt scaleNewestMost cited
Collected by the feeds
- Design and Validation of Quadruple Circular-arc Tooth Profiles for a Strain Wave Gear Using FE Analysis and Experiments
Strain wave gears are widely used in applications that require high reduction ratios, compact designs, and high positioning accuracy. However, increasing torque capacity remains a key challenge, particularly due to the high stresses at the flex spline tooth root. This study…
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Stress-strain analysis of cycloidal gear tooth segment using FEM
In robotics and industrial automation, cycloidal reducers are widely used due to their high transmission ratios, compact design, and low backlash. However, their specific kinematics and multiple simultaneous contacts result in complex stress and deformation states, particularly…
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOIPDF
- Modeling Load-, Velocity-, and Temperature-Dependent Transmission Errors of Cycloidal Drives for Industrial Robots Using Fourier Series
Industrial robots are rarely used for machining tasks due to their limited path accuracy. This accuracy is mainly limited by inaccuracies in the drive trains. Compliance and transmission errors occur in the joint gearboxes. While transmission errors have been extensively studied…
Fundamental research · No laboratory or pilot wording.From arXiv · not yet reviewedDOIPDF
- Dynamic Modeling and Fault Characteristic Analysis of Harmonic Drives with Flexspline Tooth Root Crack
Harbin Engineering UniversityHarbin Institute of TechnologyBeijing Institute of Aeronautical MaterialsChina Electronics Standardization Institute
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Modeling and Experimental Analysis of the Transmission Error in Top-Hat Harmonic Drive Considering Manufacturing and Assembly Errors
Top-hat-type harmonic drives are widely used in industrial robots and high-end equipment due to their large hollow structure, high load capacity, and high precision. However, unlike cup-type harmonic drives, the transmission error characteristics of top-hat-type structures are…
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Chebyshev Surrogate Modeling and Robust Multi-Objective Optimization of Dynamic Transmission Error in Harmonic Drives Under Parameter Uncertainty
To address the influence of multi-source probabilistic uncertain parameters on the dynamic transmission error (DTE) of harmonic drives, this paper proposes a robust DTE modeling and multi-objective optimization method. First, a Chebyshev surrogate model is constructed by…
Jiangsu University of Science and Technology
Applied / lab · Says "prototype".From OpenAlex · not yet reviewedDOI
- Nonlinear H∞ optimal control of reconfigurable robot manipulator via adaptive torque estimation
Reconfigurable Robot Manipulators (RRMs) have extensive applications in power grids, industrial 4.0 and flexible manufacturing, disaster rescue and exploration, as well as complex environments such as earthquakes and fires. This study examines the performance of reconfigurable…
Jilin Electric Power Research Institute (China)State Grid Jilin Electric Power (China)Changchun University of Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Multisensor Fusion-Driven Transfer Learning for Remaining Useful Life Prediction of Harmonic Drives
Reliable estimation of remaining useful life (RUL) is essential for enabling condition-based maintenance decisions. Nonetheless, most current RUL prediction techniques encounter considerable difficulties under varying operational conditions, mainly due to the complex and diverse…
Beihang UniversityChongqing University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOIPDF
- Novel discrete flexible multibody model for ball bearings with deformable rings in harmonic drive applications
Deformable ball bearings play a critical role in harmonic drives, where the transmission principle relies on elastic deformation of thin-walled components. Classical models based on rigid rings or computationally expensive FEM approaches struggle to capture the dynamic behaviour…
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Flexspline tooth fault detection in harmonic drives using instantaneous angular speed signal energy-difference weighting
Harmonic drives are widely used in industrial robots. However, due to the flexspline’s high contact ratio and the elastic deformation, conventional signal processing, such as synchronous averaging, struggle to extract information about flexspline tooth faults. To address this…
Kunming University of Science and Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Analysis on the mechanical performance of an externally excited harmonic drive
This paper presents a design method for a harmonic drive (HD) with the full conjugate tooth profiles and dual-eccentric circular-arcs (DECA) external wave generator (WG). First, the conjugate combined cycloid tooth profile (CCTP) equations for the circular spline (CS) and…
Tianjin UniversityGuizhou Electromechanical Research and Design Institute
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Enhancing gear shaping precision and reducing noise via DRL
This study addresses the critical demand for high-precision, low-noise gears in humanoid robot joint reducers. Conventional gear shaping processes typically achieve only GB/T 10,095.1-2022 Grade 6-7 precision, which cannot meet the requirements of silent transmission (30–45 dB)…
Tianjin University of Technology and EducationTianjin University of TechnologyBeijing Machine Tool Research Institute
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOIPDF
- Structural Optimization of Harmonic Drive Flexspline to Improve Fatigue Lifetime
To address the limitations of existing studies on harmonic drive (HD) systems, such as the lack of systematic exploration of the influence of flexspline (FS) structural parameters on service lifetime and insufficient parameter optimization strategies, this study establishes a…
Lanzhou University of TechnologyLongdong University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Research Progress on Mechanical Properties and Fatigue Failure of Harmonic Drive Flexspline
Purpose—The flexspline of a harmonic drive constitutes a thin-walled structure with discontinuous gear rim and cylinder configuration, where cyclic stresses induce stress concentration, followed by crack initiation, propagation, and ultimately fatigue failure. This paper reviews…
Lanzhou University of TechnologyLongdong University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOIPDF
- Physics-Informed Neural Networks with Unscented Kalman Filter for Sensorless Joint Torque Estimation in Humanoid Robots
This paper presents a novel framework for whole-body torque control of humanoid robots without joint torque sensors, designed for systems with electric motors and high-ratio harmonic drives. The approach integrates Physics-Informed Neural Networks (PINNs) for friction modeling…
Fundamental research · No laboratory or pilot wording.From arXiv · not yet reviewedDOIPDF
- Physics-Informed Learning for the Friction Modeling of High-Ratio Harmonic Drives
This paper presents a scalable method for friction identification in robots equipped with electric motors and high-ratio harmonic drives, utilizing Physics-Informed Neural Networks (PINN). This approach eliminates the need for dedicated setups and joint torque sensors by…
Fundamental research · No laboratory or pilot wording.From arXiv · not yet reviewedDOIPDF
- Fault Diagnosis of Harmonic Drives Using Multimodal Collaborative Meta Network With Severely Missing Modality
The existing fault diagnosis of harmonic drives is difficult to deploy vibration sensors, and the diagnosis accuracy is insufficient only using current signal. Therefore, we propose an intelligent fault diagnosis method using a multimodal collaborative meta network (MCMN) with…
University of Hong KongSouth China University of Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Knowledge Embedded Autoencoder Network for Harmonic Drive Fault Diagnosis Under Few-Shot Industrial Scenarios
The development of Internet of Things technology provides abundant data resources for prognostics health management of industrial machinery, and data-driven methods have shown their powerful ability in the field of fault diagnosis. However, these methods have several limitations…
South China University of Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Comprehensive design and whole-cavity simulation of a multi-beam inductive output tube using a 3rd harmonic drive on the grid
In this paper, we discuss the design and whole-cavity simulation of a Multi-Beam Inductive Output Tube (MBIOT) that uses a 3rd harmonic component to the drive voltage on the grid. High-efficiency inductive output tubes (IOTs) are typically characterized by efficiencies up to 70 -…
Fundamental research · No laboratory or pilot wording.From arXiv · not yet reviewedPDF
- Physics-Informed Neural Network for Model Prediction and Dynamics Parameter Identification of Collaborative Robot Joints
Collaborative robots have promising potential for widespread use in small-and-medium-sized enterprise (SME) manufacturing and production due to the development of increasingly sophisticated Human-Robot Collaboration technologies. However, predicting and identifying the behavior…
Aarhus UniversityUniversity of LiverpoolLeverhulme TrustLeverhulme Research Centre for Functional Materials Design
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Data-Driven Modeling and Analysis of Transmission Error in Harmonic Drive Systems: Nonlinear Dynamics, Error Modeling, and Compensation Techniques
Harmonic drive systems (HDS) are high-precision robotic transmissions featuring compact size and high gear ratios. However, issues like kinematic transmission errors hamper their precision performance. This article focuses on data-driven modeling and analysis of an HDS to improve…
Fundamental research · No laboratory or pilot wording.From arXiv · not yet reviewedPDF
- Fast superconducting qubit control with sub-harmonic drives
Increasing the fidelity of single-qubit gates requires a combination of faster pulses and increased qubit coherence. However, with resonant qubit drive via a capacitively coupled port, these two objectives are mutually contradictory, as higher qubit quality factor requires a…
Applied / lab · Says "we demonstrate".From arXiv · not yet reviewedPDF
- Cooperative Game-Based Approximate Optimal Control of Modular Robot Manipulators for Human–Robot Collaboration
Major challenges of controlling human-robot collaboration (HRC)-oriented modular robot manipulators (MRMs) include the estimation of human motion intention while cooperating with a robot and performance optimization. This article proposes a cooperative game-based approximate…
Changchun University of TechnologyToronto Metropolitan University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Online Fault Diagnosis of Harmonic Drives Using Semisupervised Contrastive Graph Generative Network via Multimodal Data
Harmonic drive is a core component of the industrial robot, its failure will directly affect the robot's performance. Moreover, as the harmonic drive often works with excessive speed and load, it may fail unpredictably. Therefore, online fault diagnosis is quite significant. In…
South China University of TechnologyGuangzhou Mechanical Engineering Research Institute (China)
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Fault Diagnosis of Harmonic Drives Based on an SDP-ConvNeXt Joint Methodology
Harmonic Drives (HDs) are key components of industrial robots, and damages or failures of the HDs can lead to robot paralysis or even cause operational accidents. To prevent this from happening, it is of great importance to design proper algorithms for fault diagnosis of the HDs…
Northeastern UniversityChangsha University of Science and TechnologyFoshan University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Prognostic health management of the robotic strain wave gear reducer based on variable speed of operation: a data-driven via deep learning approach
ABSTRACT The robotic reducer is prone to failure because of its unique characteristics. Data from vibration and acoustic emission sensors have been used for the prognostics of the reducer. However, various issues are associated with such traditional techniques. Hence, our…
Dongguk UniversitySeoul National University
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Compound Fault Diagnosis of Harmonic Drives Using Deep Capsule Graph Convolutional Network
The harmonic drive is a key component of the industrial robot. Because of its large reduction ratio and excessive dynamic loading, various kinds of faults may occur. In particular, since the robot is an integrated system, it is not unusual to have multiple harmonic drive…
South China University of Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- An equivalent mechanism model for kinematic accuracy analysis of harmonic drive
Dalian University of Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Effect of fine particle peening on surface integrity of flexspline in harmonic drive
Chongqing UniversityPolitecnico di Milano
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI
- Parameter design of double-circular-arc tooth profile and its influence on meshing characteristics of harmonic drive
Chongqing UniversityChinese Academy of SciencesShenzhen Institutes of Advanced Technology
Fundamental research · No laboratory or pilot wording.From OpenAlex · not yet reviewedDOI