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Analysis and Testing of a Flyable Micro Flapping-Wing Rotor with a Highly Efficient Elastic Mechanism.
Biomimetics (Basel)
December 2024
Centre for Aeronautics, Faculty of Engineering and Applied Sciences, Cranfield University, Bedford MK43 0AL, UK.
A Flapping-Wing Rotor (FWR) is a novel bio-inspired micro aerial vehicle configuration, featuring unique wing motions which combine active flapping and passive rotation for high lift production. Power efficiency in flight has recently emerged as a critical factor in FWR development. The current study investigates an elastic flapping mechanism to improve FWRs' power efficiency by incorporating springs into the system.
View Article and Find Full Text PDFA Compact Piezo-Drive Rotatable Scanning Tunneling Microscope in a 12 T Cryogen-Free Magnet.
Microsc Res Tech
December 2024
University of Science and Technology of China, Hefei, People's Republic of China.
Atomically resolved scanning tunneling microscope (STM) capable of in situ rotation in a narrow magnet bore has become a long-awaited but challenging technique in the field of strong correlation studies since it can introduce the orientation of the strong magnetic field as a control parameter. This article presents the design and functionality of a piezoelectrically driven rotatable STM (RSTM), operating within a 12 T cryogen-free magnet and achieving a base temperature below 1.8 K, along with spectroscopic capabilities.
View Article and Find Full Text PDFControl strategy of the novel stator free speed regulating wind turbine generation system.
PLoS One
December 2024
Tianjin Mingyang Wind Power Equipment Co., Ltd. Tianjin, China.
Building a high-proportion renewable energy power system is a key measure to address the challenges of the energy revolution and climate change. However, current high-proportion renewable energy systems face issues of frequency instability and voltage fluctuations. To address these challenges, this paper proposes a novel topology for a stator free speed regulating wind turbine generation system.
View Article and Find Full Text PDFCascade control method for hydraulic secondary regulation drive system based on adaptive robust control.
ISA Trans
November 2024
Ningbo Institute of Technology, Beihang University, Ningbo 315800, China. Electronic address:
Article Synopsis
- The hydraulic secondary regulation drive system uses a hydraulic servo motor for precise position tracking but suffers from issues like high inertia and low damping, which reduce control accuracy.
- This paper proposes a cascaded control strategy that incorporates adaptive robust control, utilizing a fifth-order model to split the system into inner and outer control loops for better management of uncertainties and disturbances.
- Experimental results demonstrate that this new method significantly improves position tracking accuracy by 50% to 80% compared to traditional methods, even under varying frequency commands.
From Fine-Grain to Coarse-Grain Modeling: Estimating Kinetic Parameters of DNA Molecules.
Acta Biotheor
November 2024
Amazon Web Services, 7 W34th Street, New York, NY, 10001, USA.
Coarse-grain models are essential to understand the biological function of DNA molecules because the length and time scales of the sequence-dependent physical properties of DNA are often beyond the reach of experimental and all-atom computational methods. Simulating coarse-grain models of DNA, e.g.
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