Results 51 to 60 of about 943 (177)

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source

Fault Diagnosis of Planet Gear Using Continuous Vibration Separation and Minimum Entropy Deconvolution

Applied Sciences, 2020
Planet gear is the most unique dynamic component in planetary gearbox. It rotates around sun gear while rotating around its own central axis, causing modulation effect in monitoring signal.
Jian Shen, Lun Zhang, Niaoqing Hu
doaj   +1 more source

Design and Performance of a Planetary Gearbox with Two DOFs

Machines
The article aims to describe the design and operation of a fundamentally new self-regulating planetary transmission, which, without a control system, changes the gear ratio under the influence of a variable external load. A self-regulating transmission can be created based on a kinematic chain with two degrees of freedom, having only one input ...
Dana Tulekenova, marco ceccarelli, Konstantin Ivanov, Matteo Russo   +3 more
openaire   +2 more sources

The Promise of Solid Lubricants for a Sustainable Future

Advanced Materials, Volume 38, Issue 8, 6 February 2026.
Lubricants are vital for technology, saving energy and resources. The industry seeks sustainable solutions beyond fossil fuels. Solid lubricants offer extremely low friction and reduce environmental impact, especially in harsh conditions. Can these solids truly replace liquid lubricants, or are they limited to extreme applications?
Philipp G. Grützmacher, Andrey A. Voevodin, András Korényi‐Both, Maria Clelia Righi, Christopher DellaCorte, Nazlim Bagcivan, Ali Erdemir, Carsten Gachot   +7 more
wiley   +1 more source

Planetary Gearbox Fault Diagnosis based on LMD Sample Entropy and ELM

Jixie chuandong, 2020
In order to solve the difficult problem of early fault feature extraction of planetary gearbox and consider that the planetary gearbox vibration signal is coupling and nonlinear，and the signal has multiple transmission paths，a planetary gearbox fault ...
Zhang Ning, Wei Xiuye, Xu Jinhong
doaj  

Advances in Triboelectric Nanogenerators With Rotating Structure

Carbon Energy, Volume 8, Issue 2, February 2026.
The rotating TENG has been widely studied for its superiorities of simple structure, high efficiency, and stable output. This review introduced the four different principles of rotating TENG and offered a thorough summary for performance and application research through three‐level classification. Importantly, the current existing problems, challenges,
Chuguo Zhang, Chunxu Xue, Yutong Chen, Yujie Qiang, Seeram Ramakrishna   +4 more
wiley   +1 more source

Root Crack Identification of Sun Gear in Planetary Gear System Combining Fault Dynamics with VMD Algorithm

Shock and Vibration, 2021
Planetary gearbox is widely used in various low-speed machines due to its large transmission ratio. However, the gears in a planetary gearbox are prone to the mechanical faults due to the complex dynamic heavy load.
Hongwei Fan, Yiqing Yang, Hongwei Ma, Xuhui Zhang, Xiang Wan, Xiangang Cao, Qinghua Mao, Chao Zhang, Qi Liu   +8 more
doaj   +1 more source

OPPORTUNITIES FOR THE APPLICATION OF A PLANETARY GEARBOX AS A REVERSING UNIT

Proceedings
The gearbox has been designed as a two-carrier unit with two brakes, and it has been depicted using the Wolf-Arnaudov symbols. The ideal torque ratios for six pairs of reversing gear ratios have been determined and the relationship between the ideal torque ratios of both planetary gear setsrequired for obtaining reversible transmission ratios was ...
Sanjin TROHA, Jelena STEFANOVIĆ MARINOVIĆ, Željko VRCAN, Kristina MARKOVIĆ, Marko PERIĆ   +4 more
openaire   +1 more source

Improving the Characteristics of the Direct FOC Strategy in DFIG‐Based Wind Turbine Systems Using FOIDD and FOPD Controllers

Energy Science &Engineering, Volume 14, Issue 2, Page 999-1021, February 2026.
This study presents a new control strategy for doubly fed induction generator (DFIG) wind turbine systems to overcome the limitations of traditional direct field control using proportional‐integral (DFOC‐PI) regulators, which are sensitive to coefficient changes and lead to low power quality.
Hamza Gasmi, Habib Benbouhenni, Z. M. S. Elbarary, Ilhami Colak, Tahar Tafticht, Salman Arafath Mohammed   +5 more
wiley   +1 more source

A novel information fusion method for the health monitoring of planetary gearbox based on veCMDE

Advances in Mechanical Engineering
Prognostic and health management of planetary gearbox can be of important to prevent catastrophic event and economic loss. The time-varying gear meshing position and the complex transmission path bring great challenge for the health monitoring of ...
Xianzhi Wang, Yang Zhang, Xijingyi Zhang, Chenyang Ma, Yongbo Li   +4 more
doaj   +1 more source