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Multifunctional Metamaterial with Reconfigurable Electromagnetic Scattering Properties for Advanced Stealth and Adaptive Applications.
Adv Mater
October 2024
School of Mechanical Engineering (SME), Nanjing University of Science and Technology (NJUST), 200 Xiao Ling Wei Road, Nanjing, 210094, China.
The rapid development of radar detection systems has led to an increased sensitivity to the electromagnetic (EM) scattering properties of detected targets. Flexible and adaptable EM scattering properties significantly enhance the survivability of battlefield weapons. This paper presents the design of a novel multifunctional metamaterial with reconfigurable EM scattering properties based on a bistable curved beam.
View Article and Find Full Text PDFDevelopment of a full aperture backscatter system for the Orion laser.
Rev Sci Instrum
July 2024
Orion Laser Facility, Atomic Weapons Establishment plc, Reading RG7 4PR, United Kingdom.
A full aperture backscatter system (FABS) is currently in development on the Orion laser at AWE to measure scattered light from the stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) processes. The light is to be collected through the full aperture of the final optic assembly and traverse back down the beam path, with fractions of this light being directed to an optics table. By measuring the energy of this backscattered light, it is possible to gain insight into some of the laser-plasma instabilities that are present on the laser system and should give an indication of some of the scattered light losses due to the SBS and SRS processes.
View Article and Find Full Text PDFCompressive mechanical properties of dry antler cortical bone cylinders from different cervidae species.
J Mech Behav Biomed Mater
April 2024
Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege, Liège, Belgium.
Antlers are bony structures composed predominantly of primary osteons with unique mechanical properties due to their specific use by deer as weapon and shield. Antler bone fracture resistance has attracted prior scrutiny through experimental tests and theoretical models. To characterize antler mechanical properties, compression of cubes, or bending or tensioning of rectangular bars have been performed in the literature with variations in the protocols precluding comparisons of the data.
View Article and Find Full Text PDFThe adaptive optical system requires a tilt-tip mirror (TTM) with high bandwidth to compensate for optical beam jitter caused by atmospheric turbulence in real time. This paper introduces a novel, to the best of our knowledge, design of a voice coil TTM using an octagonal flexible mechanism and optimizes its parameters through theoretical analysis and finite element simulations. The results show that its resonance frequency in the non-working direction is up to 1005.
View Article and Find Full Text PDFDesign of a Biaxial High-G Piezoresistive Accelerometer with a Tension-Compression Structure.
Micromachines (Basel)
July 2023
School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, China.
Article Synopsis
- A biaxial piezoresistive accelerometer is designed for measuring high-g acceleration in multidimensional applications like weaponry and aerospace.
- The study focuses on the measurement mechanism, sensor structure, and a signal test circuit to reduce interference from stress variations in a cantilever beam.
- Performance analysis using finite element methods reveals the sensor's capabilities, achieving a range of 200,000 g, sensitivities of 1.39 µV/g and 1.42 µV/g in the X and Y directions, and natural frequencies of approximately 510 kHz.
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