Article
Automation & Control Systems
Feifei Bu, Fuqiang Xuan, Zhida Yang, Yu Gao, Zihao Pan, Michele Degano, Chris Gerada
Summary: This article proposes a RPTC strategy to effectively reduce speed fluctuation for a direct-drive permanent magnet synchronous motor servo system operating at low speeds with different torque disturbances. The RPTC controller design is investigated for robust stability and antidisturbance capability, showing good performance for periodic and nonperiodic torque disturbances at low speeds. The strategy also has a simple implementation without requiring precise speed feedback or specific torque disturbance information.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Engineering, Electrical & Electronic
Giacomo Scelba, Giulio De Donato, Abdelrahman A. M. Elsman, Luigi Danilo Tornello, Giuseppe Scarcella, Fabio Giulii Capponi
Summary: The aim of this article is to provide an accurate modeling of rotor position measurement and evaluate its impact on speed estimation. The concept of instantaneous quantized speed is introduced, and time-harmonic formulations are derived to deal with torque disturbances. Analytical and numerical results validate the filtering action of speed estimation algorithms on the harmonics of the instantaneous quantized speed. Experimental verification is also presented.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Lishuai Feng, Siyang Yu, Fengge Zhang, Shi Jin, Yujiang Sun
Summary: This study investigates the impact of rotor dynamic eccentricity on air-gap flux density, cogging torque, and losses in low-speed high-torque permanent magnet synchronous motors (LHPMSM) using both analytical methods and finite element analysis. The results indicate that increasing rotor eccentricity leads to a significant increase in harmonic distortion rate of air gap magnetic density and stator copper losses.
Article
Acoustics
Moli Chen, Nan Zheng, Jun Zheng, Zhu Jin, Guihuo Luo
Summary: This paper proposes a phase demodulation algorithm based on downsampling and local resampling (DSLR) to improve the accuracy of torsional vibration measurements. The effectiveness of the algorithm is validated through torsional vibration simulations and experiments.
SHOCK AND VIBRATION
(2022)
Article
Engineering, Electrical & Electronic
An Li, Dong Jiang, Xiangwen Sun, Zicheng Liu
Summary: This study proposes a novel online drive topology conversion technology for expanding the speed range of permanent magnet synchronous motors. By analyzing the stability of the motor and implementing a zero-current mode-conversion method, smooth topology conversion is achieved without affecting the continuous operation of the motor. The proposed dual-mode topology and zero-current mode-conversion methods have been verified for stability and dynamic performance on a PMSM experimental platform.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Can Wang, Yun Le, Shiqiang Zheng, Bangcheng Han, Baotian Dong, Qi Chen
Summary: This article explores a disturbance suppression method for the high-speed magnetically levitated rotor (MLR) system based on improved linear extended state observer (LESO). The model of the high-speed MLR system with base motion is established, and the characteristics of the gyroscopic torque disturbance are analyzed. A LESO with adaptive notch filter is designed for disturbance estimation and compensation of the magnetic bearing, and an innovative gain compensator is utilized to improve controller dynamic performance. Simulation and experimental results demonstrate the effectiveness of the proposed method in rejecting gyroscopic torque disturbances in high-speed MLCC.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Multidisciplinary Sciences
Celine Park, Taehyun Yang, Sang-Hyun Rah, Hyun Gyu Kim, Tae-Young Yoon, Min Ju Shon
Summary: Single-molecule magnetic tweezers provide a powerful tool for studying structural changes in biomolecules. However, the speed limit in image recording and thermal fluctuations of the magnetic beads has hindered its application. This article describes a high-resolution MT setup that can resolve nanoscale dynamics of biomolecules, demonstrated through experiments on DNA hairpins and SNARE complexes.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2023)
Article
Instruments & Instrumentation
Jeffrey Mc Hugh, Alice L. Thorneywork, Kurt Andresen, Ulrich F. Keyser
Summary: In this paper, we demonstrate a non-stereoscopic, video-based particle tracking system with optical tweezers to study fluid flow in the vicinity of glass nanopores in 3D. By using the quadrant interpolation algorithm, the video-based particle tracking is extended to displacements out of the trapping plane of the tweezers, allowing the study of flow from nanopores oriented at an angle to the trapping plane. Mapping of the voltage driven flow in 3D volumes outside nanopores revealed polarity dependent flow fields, consistent with the model of voltage driven flow in conical nanopores.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Engineering, Aerospace
Saumitra Barman, Manoranjan Sinha
Summary: This study derives the attitude dynamics of a rigid satellite actuated using a double-gimbal variable-speed control moment gyro (DGVSCMG) within the framework of geometric mechanics. It proposes a cascaded adaptive fixed-time sliding mode control for achieving high-precision attitude control, and considers factors such as actuator saturation and system uncertainties.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Green & Sustainable Science & Technology
Shiyi Zhao, Jinhui Xia, Ruilong Deng, Peng Cheng, Qinmin Yang
Summary: With the increasing proportion of wind power generation in the power system, the vulnerabilities of the cyber links of wind turbines are gradually exposed. This paper develops an adaptive observer-based resilient control method to defend against time-delay attacks (TDA) in wind turbines. The proposed control scheme effectively mitigates the impact of TDA and ensures the output performance of the wind turbine system.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2023)
Article
Automation & Control Systems
Bo Shuang, Zi-Qiang Zhu
Summary: In this article, a method for simultaneous sensorless rotor position and torque estimation is proposed for interior permanent magnet synchronous machines at standstill and low speed. The proposed method estimates the torque using high-frequency inductances identified from the current variations due to high-frequency square wave voltage injections in the estimated dq-axes, which are simultaneously used for sensorless rotor position estimation. Both simulations and experiments are conducted to verify the effectiveness of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Zhizhou Zhao, Wenwu Song, Yongxin Jin, Jiaxing Lu
Summary: This paper investigates the effects of rotational speed changes on clearance flow in fluid machinery through numerical simulation of a rotor-stator system cavity flow. Increasing the rotating Reynolds number leads to a gradual increase in shear stress and separation of swirling vortex at specific conditions.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Dongran Song, Xiao Tan, Xiaofei Deng, Jian Yang, Mi Dong, M. H. Elkholy, M. Talaat, Young Hoon Joo
Summary: Efficient power generation and reduced operational cost are crucial for wind energy. This study proposes a hybrid REWS prediction framework that combines mechanism analysis, data-driven techniques, and Lidar measurements. The framework initially predicts REWS through mechanism modeling and time delay analysis, and then improves accuracy using a residual prediction model based on data-driven techniques. The proposed method enhances the performance of wind turbines by improving REWS prediction accuracy.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Optics
Chenglin Zuo, Jun Ma, Chunhua Wei, Tingrui Yue, Jin Song
Summary: The photogrammetric system can address the dynamic issues of the rotor by identifying reflective targets, which is crucial for validating and optimizing helicopter performance.
Article
Acoustics
Kristen Railey Kita, Supun Randeni, Dino DiBiaso, Henrik Schmidt
Summary: This study demonstrates the passive tracking of UUVs using high-frequency motor noise in a shallow-water experiment with passing boats. By combining measurements of bearing, range rate, and speed and applying an unscented Kalman filter, the tracking accuracy is improved compared to traditional methods.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Biochemistry & Molecular Biology
Aakash Basul, Angelica C. Parentez, Zev Bryant
JOURNAL OF MOLECULAR BIOLOGY
(2016)
Editorial Material
Biology
Aakash Basu, Taekjip Ha
Article
Biology
Aakash Basu, Samuel Lagier, Maria Vologodskaia, Brian A. Fabella, A. J. Hudspeth
Article
Biochemistry & Molecular Biology
Aakash Basu, Matthew Hobson, Paul Lebel, Louis E. Fernandes, Elsa M. Tretter, James M. Berger, Zev Bryant
NATURE CHEMICAL BIOLOGY
(2018)
Article
Biophysics
Aprotim Mazumder, T. Roopa, Aakash Basu, L. Mahadevan, G. V. Shivashankar
BIOPHYSICAL JOURNAL
(2008)
Article
Biochemistry & Molecular Biology
Zev Bryant, Florian C. Oberstrass, Aakash Basu
CURRENT OPINION IN STRUCTURAL BIOLOGY
(2012)
Article
Physics, Condensed Matter
D. Chowdhury, A. Basu, A. Garai, P. Greulich, K. Nishinari, A. Schadschneider, T. Tripathi
EUROPEAN PHYSICAL JOURNAL B
(2008)
Article
Biochemistry & Molecular Biology
Aakash Basu, Allyn J. Schoeffler, James M. Berger, Zev Bryant
NATURE STRUCTURAL & MOLECULAR BIOLOGY
(2012)
Review
Chemistry, Multidisciplinary
Sonisilpa Mohapatra, Chang-Ting Lin, Xinyu A. Feng, Aakash Basu, Taekjip Ha
Review
Biochemistry & Molecular Biology
Aakash Basu, Dmitriy G. Bobrovnikov, Taekjip Ha
Summary: The mechanical deformations of DNA are involved in nucleoprotein interactions and DNA manipulation events. Progresses in single-molecule, structural, and computational methods have characterized the mechanical properties of DNA, and sequencing technology has allowed measuring how these properties vary with sequence and epigenetic modifications. These technological advancements have contributed to the emerging idea that variations in the mechanical properties of DNA play a fundamental role in regulating diverse processes involved in chromatin organization at a genome-wide level.
JOURNAL OF MOLECULAR BIOLOGY
(2021)
Article
Education, Scientific Disciplines
Aakash Basu, Debashish Chowdhury
AMERICAN JOURNAL OF PHYSICS
(2007)
Article
Physics, Fluids & Plasmas
Aakash Basu, Debashish Chowdhury
Article
Physics, Fluids & Plasmas
Lipsa Nanda, Aakash Basu, S. Anantha Ramakrishna