Ultra-high-speed hybrid ceramic triboelectric bearing with real-time dynamic instability monitoring

Article Chemistry, Physical

A high-speed and long-life triboelectric sensor with charge supplement for monitoring the speed and skidding of rolling bearing

Zhijie Xie et al.

Summary: The paper introduces a non-contact triboelectric bearing sensor for monitoring the speed and skidding of rolling bearing. It has an ultra-wide working speed range and long service life.

NANO ENERGY (2022)

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Article Engineering, Mechanical

Experimental and theoretical approaches for determining cage motion dynamic characteristics of angular contact ball bearings considering whirling and overall skidding behaviors

Shuai Gao et al.

Summary: This study proposed a comprehensive bearing dynamic model focused on cage characteristics and introduced several indicators describing cage stability and skidding degree based on experimental and theoretical results. It identified factors affecting bearing skidding and instability of the cage.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Engineering, Mechanical

Stability and skidding behavior of spacecraft porous oil-containing polyimide cages based on high-speed photography technology

Shuai Gao et al.

Summary: Experimental study was conducted on the stability and skidding degree of the porous oil-containing polyimide cage used in spacecraft rolling bearings. The results showed that the oil-content ratio, applied load, and rotation speed all influenced the vibration level, skidding ratio, and whirl radius fluctuation amplitude of the cage.

TRIBOLOGY INTERNATIONAL (2022)

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Article Chemistry, Physical

Semisolid-lubricant-based ball-bearing triboelectric nanogenerator for current amplification, enhanced mechanical lifespan, and thermal stabilization

Myunghwan Song et al.

Summary: The study demonstrated the use of commercial lubricants to improve the electrical output of TENGs, effectively reducing frictional wear and enhancing the mechanical lifespan of the device.

NANO ENERGY (2022)

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Article Chemistry, Physical

Triboelectric based high-precision self-powering cage skidding sensor and application on main bearing of jet engine

Shuai Gao et al.

Summary: A high-precision self-powering triboelectric bearing skidding sensor is developed for real-time monitoring of bearing skidding and cage stability. The sensor has advanced real-time performance and monitoring accuracy, and its output performance has been optimized through experiments. The applicability and performance of the sensor's dynamic model have been validated.

NANO ENERGY (2022)

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Article Chemistry, Physical

Ultra-compact triboelectric bearing based on a ribbon cage with applications for fault diagnosis of rotating machinery

Ziyuan Jiang et al.

Summary: A ribbon-cage-based triboelectric bearing (RTB) is proposed for the fault diagnosis of rotating machinery. The RTB utilizes existing structures of rolling bearings and adds an insulating film and electrodes to form a compact triboelectric nanogenerator. The fabricated RTB prototype demonstrates self-sensing and self-powering capabilities and is used in fault diagnosis of rotating machinery. Results show that the RTB output current can accurately diagnose faults with a classification accuracy exceeding 90%.

NANO ENERGY (2022)

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Article Green & Sustainable Science & Technology

A highly efficient triboelectric negative air ion generator

Hengyu Guo et al.

Summary: This study introduces a corona-type, mechanically stimulated triboelectric NAI generator that efficiently produces negative air ions for air purification. The device is simple, safe, and effective, offering a sustainable solution for improving indoor air quality.

NATURE SUSTAINABILITY (2021)

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Article Engineering, Mechanical

On-line real-time mistuning identification and model calibration method for rotating blisks based on blade tip timing (BTT)

Dongfang Hu et al.

Summary: Identifying mistuning parameters and calibrating the FEM of the mistuned blisk in real-time is meaningful for acquiring dynamic characteristics and predicting stress response. The synergistic effect of mass and stiffness mistuning is presented by a standard coefficient. The BR-IDC approach improves FEM precision through real-time mistuning identification and model calibration.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2021)

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Article Engineering, Mechanical

Ball bearing skidding and over-skidding in large-scale angular contact ball bearings: Nonlinear dynamic model with thermal effects and experimental results

Shuai Gao et al.

Summary: Rolling elements in rolling element bearings should continuously roll on raceways for pure rolling, but skidding or over-skidding may occur with improper loading and lubrication, especially in low-load roller bearings. An empirical study shows the inaccuracy of theoretical values for determining slipping of rolling elements, and proposes a more accurate KH-THD model that considers thermal effects for large-scale industrial bearings.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2021)

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Article Multidisciplinary Sciences

Anomalous collapses of Nares Strait ice arches leads to enhanced export of Arctic sea ice

G. W. K. Moore et al.

Summary: Ice arches at the northern and southern ends of Nares Strait, a key passage in the Arctic, are forming for shorter durations, leading to increased ice transport and accelerating the export of multi-year ice.

NATURE COMMUNICATIONS (2021)

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Article Engineering, Mechanical

Triboelectric mechanical sensors-Progress and prospects

Qiang Gao et al.

Summary: The development of triboelectric nanogenerators and sensors has increased the intelligence level of equipment and promoted their application in fields such as the internet of things and biomedicine. Triboelectric mechanical sensors have made significant progress in monitoring mechanical motion, vibration, pressure, and tactile perception.

EXTREME MECHANICS LETTERS (2021)

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Article Engineering, Mechanical

Behaviour of an angular contact ball bearing with three-dimensional cubic-like defect: A comprehensive non-linear dynamic model for predicting vibration response

Shuai Gao et al.

Summary: This paper proposes an advanced dynamic model to study asymmetric defects on angular contact ball bearing raceways. The results show that the circumferential size of the 3D defect significantly affects the contact force distribution, leading to impulse vibrations in the bearing system. Avoiding extension of defects in the circumferential direction and reducing the radial-axial load ratio can mitigate vibration impulses.

MECHANISM AND MACHINE THEORY (2021)

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Review Chemistry, Multidisciplinary