Showing papers in "Defence Technology in 2020"

TL;DR: In this paper, a review of composites based on carbon fillers is presented to illustrate the detailed exploitation of various polymer nanocomposites in addition to especially mentioned epoxy composites.

TL;DR: An actual MADM application has been given to testify this new model and some comparisons between this novel MABAC model and two q-ROFNs aggregation operators are provided to further demonstrate the merits of the q-rung orthopair fuzzy MABac model.

TL;DR: Compared with other noise reduction techniques, the validity of CEEMDAN-MMSVC-LMSAF can be proved by the analysis of simulation signals and real underwater acoustic signals, which has the better noise reduction effect and has practical application value.

TL;DR: In this article, three schemes are applied to strengthen the polyurea-coated autoclaved concrete (AAC) panels through spraying 4 1/4mm thick Polyurea coating from top, bottom and double-sides.

TL;DR: The results show a promising application prospect for RNN in the field of positioning for INS/GNSS integrated navigation in the absence of GNSS signal, as it outperforms extreme learning machine (ELM) and EKF by approximately 30% and 60%, respectively.

TL;DR: In this paper, the influence of active constrained layer damping (ACLD) treatment towards precise control of frequency responses of functionally graded skew-magneto-electro-elastic (FGSMEE) plates by employing finite element methods.

TL;DR: In this article, a series of experimental tests were carried out on the rotating detonation combustor (RDC) with air-heater, and three different types of instability were observed in the experiments: temporal and spatial instability, mode transition and re-initiation.

TL;DR: A novel facial emotion recognition based on graph mining has been proposed in this paper to make a paradigm shift in the way of representing the face region and shows significant accuracy improvements by the proposed system in comparison to current published works in SAVEE database.

TL;DR: This method can effectively solve the MADM problem whose decision information is represented by q-rung orthopair fuzzy numbers (q-ROFNs) and whose attributes are incomplete and the effectiveness and superiority of the new model are analyzed.

TL;DR: The cylindrical DAA structure performed much better than its equal solid panel in both blast resistance and energy absorption capacity and can be used as a reference for different applications.

TL;DR: This paper proposes a new way of tracking, where an unmanned aerial vehicle (UAV) circles on one side of the tracked target, and develops a circular path algorithm for monitoring the relative position between the UAV and the target considering the real-time range and the bearing angle.

TL;DR: In this paper, the effect of alkaline treatment of sodium hydroxide (NaOH) on physical and dynamic mechanical analysis (DMA) viscoelastic properties of kenaf fiber filled natural rubber (NR)/thermoplastic polyurethane (TPU) composites was investigated.

TL;DR: In this article, the authors explored the use of natural fiber Jute-epoxy (JE), JuteepoxyRubber (JRE) sandwich composite composite for ballistic energy absorption.

TL;DR: In this paper, the dynamic response and damage model of reinforced concrete columns subjected to underwater explosions were investigated by means of scaled-down experiment models, and three damage models, including bending failure, bending-shear failure and punching failure, were identified.

TL;DR: According to the actual conditions of cooperative operations, a new MAV/UAV collaborative combat network model construction method based on a complex network is presented, and a method for evaluating the synergistic effect of the cooperative combat network is developed.

TL;DR: In this article, a review of the studies about the mechanism and process of protection against hypervelocity impacts using Whipple shield is presented, and some prospects and suggestions for future studies are put forward.

TL;DR: In this paper, the authors used Nettle fiber (NF)/bauhinia vahlii fiber (BF) based mono/hybrid epoxy composites at varying weight percentage of 2-6 wt% and evaluated the physical (void fraction and water absorption), mechanical (tensile strength, flexural strength, hardness) and sliding wear properties of as-fabricated composites.

TL;DR: In this article, the response of an explosion-welded Ti6Al4V/pure titanium with a flat interface to dynamic loading is investigated using a DIC system coupled with the SHPB.

TL;DR: In this article, the authors described the preparation and study of composite nanoparticles prepared by the sol-gel method which consists of two materials (Al2O3-CaO), and study the effect of these nanoparticles on the mechanical behavior of a polymer blend (EP 4% + 96% UPE).

TL;DR: In this article, 3D-Honeycombed CL-20 structures with low critical size of detonation have been fabricated successfully for intelligent weapon systems using a micro-flow direct ink writing (DIW) technology.

TL;DR: In this article, compression, tension and fatigue tests of various stacking sequences of plain jute/carbon reinforced polyvinyl butyral by hot hydraulic press technique were experimentally conducted.

TL;DR: In this article, the authors demonstrate application of spray evaporation to prepare reduced sensitive co-crystals of high performance nitramine explosives like HMX and CL-20 with a relatively less insensitive explosive 1,1-diamino-2,2-dinitroethylene or FOX-7.

TL;DR: In this article, the effect of winding orientation on the crashworthiness performance of hybrid tube was investigated under quasi-static compression load and the results showed that the hybrid kenaf/glass composite tube with high winding orientation showed the best winding orientation to enhance the energy absorber characteristics as energy absorption application.

TL;DR: In this article, the effect of SiC particle reinforcement and artificial ageing times on the microstructural modifications was characterized using optical and electron microscopy, electron backscattered diffraction and X-Ray diffraction.

TL;DR: In this paper, the influence of polyurea coating on steel plate deformation was investigated under near-field blast loads, produced by the detonation of 1 kg of spherical nitromethane charges, at a standoff distance of 150mm.

TL;DR: In this article, a simulation of the interface defeat of a long-rod projectile impacting on a ceramic target with a certain velocity is performed with the commercial finite element program AUTODYN.

TL;DR: In this article, a density-functional theory calculation was applied to optimize three configurations of TKX-50-AP compounds, and the geometry structure, electrostatic potential and binding energy of the compounds were predicted.

TL;DR: Numerical experiments demonstrate that the proposed “offline planning + online tracking” framework can achieve efficient and robust coordinated taxiing planning and tracking even in the presence of initial state error and continuous external disturbances.

TL;DR: In this article, the unidirectional [0°/90°/45°/-45°]s basalt fiber composites (UBFC) and the woven basalt composite (WBFC) were prepared by hot-pressing and three-point bending test, low velocity impact test, and ballistic test were performed to the prepared composites.

TL;DR: Both subjective and objective methods prove that the spots generated by this method are similar to the background spots, which provides a new technical method for the deformation camouflage pattern design and camouflage effect evaluation.