bluuebunny/crossref_metadata_2025_split huggingface dataset:
Battery status estimation using extended belief rule base with novel rule reduction method
Authors: Zhu H Z , Xiao M Q , Li J F , Liu Zh Zh 
Published: July 2020

Abstract
The status estimation for lithium battery is playing more and more important role in preventing the catastrophic failure of the system. The traditional data-driven methods treat the battery status estimation as a black box, which denies interpretability of the health status estimation process. Originated from belief rule base(BRB) methods, the extended belief rule base(EBRB) broadened the possible application areas of BRB. By transferring measured data into extended belief rules, EBRB combines the advantages of accuracy from data driven methods and interpretability from belief rule based methods. This paper employs EBRB to deal with battery status estimation problem. Moreover, in this paper, we proposed a novel rule reduction method to optimize the performance of EBRB. The effectiveness of the proposed method is verified by the data of spacecraft applied batteries. Comparison among the proposed method, conventional EBRB and BP neural network is given in this paper to further illustrate the performance of the proposed method.
Optimum design of the inlet port profile of a ramjet extended range projectile
Authors: Wang X , Li T 
Published: July 2020

Abstract
The air-inlet is one of the important components of the stamped extended range engine. Its performance directly affects the thrust of the ramjet engine, which in turn affects the range of the projectile. Because the stamped extended range projectile has the characteristics of simple structure, light weight and small volume, the inlet profile of the stamped extended range projectile is generally unadjustable, and the air-inlet surface quality directly determines the performance of the air-inlet. And the resistance characteristics of the shells. Since the air-inlet is associated with the curved portion of the projectile, the curved portion is one of the main sources of resistance to the projectile, so it is necessary to optimize the design of the air-inlet profile. Firstly, based on the CFD flow field simulation, the optimal design method of the air-inlet profile is studied. The parametric modeling, flow field simulation and optimization strategy of the air-inlet are integrated on the platform to realize automatic optimization. The optimization of the nozzle is optimized by this optimized design method, which proves its feasibility. Then, the single-objective optimization and multi-objective optimization of the air-inlet profile are carried out, and the geometric model is established to more accurately describe the flow field characteristics and obtain a more accurate air-inlet profile. Finally, a supersonic wind tunnel test was carried out on the optimized air-inlet, and the wall static pressure and the total outlet pressure of the windward side and the leeward side were measured and compared with the simulated Mach number of 2.5 and 2.0. Comparative Results. The two are basically the same, indicating that the numerical simulation results can basically reflect the pressure change and the change of the total pressure in the air-inlet. Therefore, the reliability of simulation-based optimization results is high.
Simulation study on the jet formation and penetration capability of hypervelocity double-layer liner shaped charges
Authors: Xie J W , Wang H F , Zheng Y F , Geng B Q , Ge Ch 
Published: July 2020

Abstract
The jet formation and penetration capability of hypervelocity double-layer liner shaped charges (HDLLSCs) against rolled homogeneous armor (RHA) targets are investigated by numerical simulation. The HDLLSCs with different cone angle and relative position of disc are simulated to investigate the influence of these parameters on penetration capability and compare with a traditional conical shaped charge (CSC). The simulation results show that, the tip velocity of the jet formed by HDLLSCs with a tantalum disc is lager by 6.8% compared with that formed by the CSCs. The three stages of jet formation for HDLLSC including converge, formation, and secondary impact are revealed and discussed. The penetration capability of HDLLSCs is influenced by the coupled effect of cone angle and relative position of disc, a larger relative position of disc is more suitable for a large cone angle. In addition, the standoff also has a significant effect on the penetration depth of HDLLSCs, the penetration depth increases from 3.31 charge diameter (CD) to 6.52 CD with the standoff increasing from 1.5 CD to 4.0 CD. Moreover, the penetration depth of the jet formed by HDLLSCs is larger by 18.5% compared with that formed by the CSCs at the standoff of 4.0 CD.
Simulation analysis of residual stress of autofrettaged barrel under multi-field coupling loads
Authors: Gao X K , He Q , Liu P K , Shao X J , Wang Z S 
Published: July 2020

Abstract
High-pressure guns repeatedly withstand transient high pressures and high temperatures, which have a great influence on the residual stress of the barrel. In order to study the stress distribution of autofrettaged barrel under multi-field coupling during launch, the mechanical autofrettage gun barrel and finishing process of the barrel was simulated by ANSYS finite element software, in which the finite element model considering the initial residual stress of the autofrettaged barrel was established, and the dynamic and static continuous process simulation of the barrel was carried out. On the basis of obtaining the residual stress distribution, an analytical model under the coupling of transient pressure field and temperature field is established. The APDL language programming is used to calculate the time and space distribution of the stress of the key parts of the barrel. A phenomenon is found that the equivalent stress on the outer surface of the barrel increases sharply with the increase of the pressure, and then rises to the highest point with the temperature of the barrel. After the fire process, the equivalent stress slowly recovers with the decrease of the temperature. The law of external surface stress rise in the fire period is a step process. It provides a theoretical basis for studying the residual stress release law the safety design of barrel.
Finite element modeling of bullet-barrel interaction and mechanism analysis of swing phenomenon of bullet
Authors: Liu H Sh , Xu Ch 
Published: July 2020

Abstract
The process of bullet-barrel interaction refers to the following physical process: after the gun is fired, the bullet moves forward under the push of powder gas, interacts with the barrel by extrusion, friction, contact and collision, and finally leaves the barrel. The swing phenomenon of bullet, which has a great influence on the shooting accuracy, is formed in this process. In order to study the formation of swing phenomenon and effect of barrel structure on swing, a finite element simulation model for the interaction process of a sniper rifle is established and calculated in this paper. The movement and stress distribution of bullet and barrel in bullet-barrel interaction process are obtained by simulation calculation, the swing of the bullet under different bore throat taper and rifle type is compared, and the intuitive process of the swing phenomenon of the bullet is obtained. Based on the calculation results, the following conclusions are obtained: Firstly, the dynamic process of bullet swing formation and amplification is obtained. In pre-shooting stage and extrusion stage, because of eccentricity of structure and other reasons, the bullet’s axis deviates in the process of embedding to form initial disturbance, called formation stage. In post-extrusion stage, the initial disturbance is continuously amplified due to the combined action of bullet structure, contact between bullet and barrel, and the pressure of powder gas, finally, the swing phenomenon of bullet is formed, called the amplification stage. Secondly, the effects of bore throat angle and rifle type on bullet swing are obtained.
Numerical study on the damage behavior of concrete target influenced by penetration velocity and target properties
Authors: Zheng Z J , Ma T B , Xu X Zh 
Published: July 2020

Abstract
The influence of initial penetration velocity and target properties on the damage behavior of concrete target by kinetic energy (KE) projectiles are studied numerically. Numerical models of penetration at different velocities were established, the failure of concrete and the law of the impact at different initial velocities ranging from 950 m/s to 1500 m/s on the damage behavior of concrete target is obtained. Damage process of concrete target slabs with different strengths and thicknesses under various impact load was carried out and the relationships between the damage behavior and the target strength ranging from 35 MPa to 95 MPa and the thickness ranging from 1 m to 2 m were obtained. Combination with the experiment results demonstrates that, the descent rate of the initial velocities increase as the initial velocities were improved. The higher the strength of the target, the less the residual velocity decrease caused by increasing the strength of the target. Under the condition of the same thickness increase amplitude, higher totally thickness of the targets results in greater penetration resistance. Furthermore, the overload peak value and the oscillation period of the impact load are positively related to the initial velocity and target thickness. With the increase of penetration depth, the impact load presents a first dramatic increase, then gradual decrease trend with obvious oscillations.
Research on dynamic response of pbo fiber-reinforced composite under high-speed penetration
Authors: Wang R H , Li F Q , Wang X C , Xu J L , Li S H , Chen Y W , Wang D Y 
Published: July 2020

Abstract
The damage mode and failure mechanism of the PBO composite are studied of the penetrating speed from 900 m/s to 1900 m/s, based on the dynamic response of the PBO fiber-reinforced composite target under high-speed penetration. Firstly, the mechanical properties of the projectile and the target material under high strain rate were characterized, and then the penetration of high-speed projectile into target is simulated. Finally, the penetration test is verified. The results show that the dynamic response mechanism of PBO composite target under high-speed penetration varies significantly with the penetrating speed.
The control algorithm of a programmable tandem detonator
Authors: Kuczerski T , Gibalski D 
Published: July 2020

Abstract
The article describes the results of laboratory tests of the algorithm of control of programmable detonators designed for tandem systems. Control elements were made on the basis of microcontrollers using RISC architecture. The detonator has a system to quickly excite the precursor charge and can be programmed at any time to delay the detonation of the main charge. The lack of delay in excitation of the precursor charge was realized using a comparator. The article presents the results of preliminary laboratory tests of the control algorithm of the executed system. The flexibility of the solution to program any delay time for the excitation of the main load provides a wide range of practical applications.
Reactive Molecular Dynamics Simulation of FTDO Explosive
Authors: Gonçalves R.F.B. , Rocco Bruno T. , Rocco Leopoldo , Rocco J.A.F.F. 
Published: July 2020

Abstract
Predicting explosion parameters is an important step when planning for blast tests or the design of blast resistant buildings and of explosive materials and formulations. This paper presents reactive molecular dynamics simulations of furazanotetrazinedioxide (FTDO) explosive, a new and highly energetic material, calculated with the software LAMMPS with ReaxFF force field. The decomposition steps and chemical mechanism of the material decomposition was elucidated and the Arrhenius parameters of the global decomposition reaction was calculated based on a first order approach with six different isothermal simulations sets. Results present an original mechanism for the detonation/decomposition and an activation energy and frequency factor with high linear determination coefficient. These results are the first ones published for this material and present a good comparison for future experiments.
A stochastic vulnerability analysis method for armored vehicles with active protection systems (APS)
Authors: Feng B , Liang X , Du W G , Qiu C L , Hou R S 
Published: July 2020

Abstract
A stochastic vulnerability analysis method for armored vehicles with APS was proposed. A two-processes threat-target interaction, including an interception process and a damage process, replaced the one-process of threat-target interaction in the traditional vulnerability method. Depending on the vulnerability results of the incoming threat, various residues-after-interception because of detection or interception failure, deflection, explosion and/or decomposition of the threat and collateral damage was generated and treated as input in the damage process. After randomization of the interception point, the residual penetrator deflection, warhead performance, behind armor debris, and component vulnerability characterization, a stochastic vulnerability analysis was performed. The stochastic model could provide damage states of all the critical components of interest, more practical and informative compared to the expected model.
Numerical simulation of 3D barrel system based on thermal-structural coupling under continuous firing
Authors: Gu Z C , Lu H T , Wang S , Yan W M , Xu C 
Published: July 2020

Abstract
In order to study the laws of temperature field and deformation field of the 5.56mm rifle under continuous firing, the barrel system was taken as the research object, the transient temperature field and the deformation field of the 3-D barrel system under continuous firing of 150 rounds was calculated by using thermal-structural coupling method based on ANSYS. The temperature of multiple positions of the combat gun that partially removed the lower handguard was measured by the thermal imager. The difference between the test results and the simulation results was kept below 20%. The results of simulation and experiment showed: (1) The peripheral parts of the barrel have important influence on the temperature field and deformation field of the barrel system, and it is not negligible for the study of the thermal effects of combat gun under continuous firing. (2) The temperature of the inner wall increases with the number of projectiles under continuous firing, and the chromium layer has a significant effect of reducing thermal pulse. (3) Because the barrel is heated more unevenly, it will increase the inner diameter of the barrel and offset the axis. In a word, studying and analyzing the laws of temperature field and deformation field of the rifle can lay the foundation of the thermal management theory of firearms.
Numerical simulation of high-strength concrete under uniaxial/triaxial compression based on meso-scale model
Authors: Zhang X Y , Wu H J , Li J Z , Pi A G , Huang F L 
Published: July 2020

Abstract
According to the meso-scale characteristics and structural composition of concrete, a three-dimensional finite element mesoscopic model is established based on the random aggregate generation method and the background grid projection method. Based on the improved Ottosen yield conditions, the stress-strain curves and damage parameter data of concrete are calculated, and the CDP model is applied to carry out numerical simulation under static uniaxial and triaxial compression conditions. The results show that the stress-strain curve obtained from the numerical simulation is basically consistent with the experiment, and the crack development along the ITZ can be observed in the meso-scale model, which is consistent with the experimental details. It is proved that the modeling method and parameter calculation method in this paper is accuracy and have good applicability.
Tracking of small infrared targets based on convolutional neural network
Authors: Fan Qiang , Sun Gangbo , Zou Erbo 
Published: July 2020

Abstract
As an important application of computer vision, visual tracking has been studied more and more. However, there are still many problems to be solved for infrared target detection, especially for weak infrared target detection and tracking. In addition, convolutional neural networks are widely used in visual applications such as target detection, recognition, and tracking. Therefore, in this paper, an infrared weak target detection and tracking method is designed. Based on the criteria of visual saliency, the real target can estimate by calculating the Euclidean distance between the target and its neighbours. The detected position of the target is sent to a fully convolutional siamese network DeepCF for tracking. As we know, the factors such as lighting changes, scale changes and occlusion cause the tracking failure. Therefore, a tracking confidence T is proposed to judge whether the target is lost. The motion trajectory of the target is continuously estimated if it is lost. The experimental results show that the above method can effectively detect and track infrared weak targets.
A two-stage stabilizing device of multi-degree gimbal based on flexible structure
Authors: Qi Y , Ji M , Wang H L , Xu Q Q , Wang G 
Published: July 2020

Abstract
This paper presents a new type of flexible structure of the gimbal device, the device is composed of multiple flexible supporting structure and cross butterfly voice coil motor, which can realize multi degree of freedom movement, compared with the traditional two-axis four-frame structure, has the advantage of high precision, no friction and compact bodies, and can improve the whole stability of stabilization system precision. The modal simulation of the whole flexible support gimbal is carried out by using ANSYS software, and the results show that the gimbal meets the performance requirements of the stabilized aiming system and can realize multi-degree-of-freedom movement. Finally, through the simulation comparison between the FSM structure and the stabilized aiming system of the universal frame device, the result show that the stability accuracy of the system after FSM compensation is 10urad, while the accuracy error of the flexible structure gimbal is not greater than 5urad, that is, the stability accuracy of the device can be improved. Introduction.
Numerical multi-loop integration on heterogeneous many-core processors
Authors: de Doncker E , Yuasa F , Almulihi A , Nakasato N , Daisaka H , Ishikawa T 
Published: July 2020

Abstract
We report on multi-loop integral computations executed on a PEZY/Exascaler large-scale (immersion cooling) computing system. The programming model requires a host program written in C++ with a PZCL (OpenCL-like) kernel. However the kernel can be generated by the Goose compiler interface, which allows parallelizing program loops according to compiler directives. As an advantage, the executable derived from a program instrumented with Goose pragmas can be run on multiple devices and multiple nodes without changes to the program. We use lattice rules and lattice copy (composite) rules on PEZY to approximate integrals for multi-loop self-energy diagrams with and without masses. GPU results are also given and the performnce on the different architectures is compared.
In situ analysis and visualization of massively parallel simulations of transitional and turbulent flows
Authors: Cadiou A. , Buffat M. , Pera C. , Di Pierro B. , Alizard F. , Le Penven L. 
Published: July 2020

Abstract
The increase of computational resources with the generalization of massively parallel supercomputers benefits to various fields of physics among which turbulence and fluid mechanics, making it possible to increase time and space accuracy and gain further knowledge in fundamental mechanisms. Parametric studies, high fidelity statistics, high resolutions, can be realized. However, this access poses many problems in terms of data management, analysis and visualization. Traditional workflow, consisting of writing raw data on disks and performing post-processing to extract physical quantities of interest, considerably slows down the analysis, if not becomes impossible, because of data transfer, storage and re-accessibility issues. This is particularly difficult when it comes to visualization. Usage has to be revisited to maintain consistency with the accuracy of the computation step and in this context, in situ processing is a promising approach. We developed an in situ analysis and visualization strategy with an hybrid method for transitional and turbulent flow analysis with a pseudo-spectral solver. It is shown to have a low impact on computational time with a reasonable increase of resource usage, while enriching data exploration. Large time sequences have been analyzed. This could not have been achieved with the traditional workflow. Moreover, computational steering has been performed with real-time adjustment of the simulations, thereby getting closer to a numerical experiment process.
QED and electroweak radiative corrections to polarized Bhabha scattering
Authors: Arbuzov A B , Bondarenko S G , Dydyshka Ya V , Kalinovskaya L V , Rumyantsev L A , Sadykov R R 
Published: July 2020

Abstract
Complete one-loop electroweak radiative corrections to polarized Bhabha scattering are presented. Numerical results are shown for the conditions of future circular and linear electron-positron colliders with polarized beams. A new Monte Carlo event generator for simulation of Bhabha scattering is created. Higher order QED collinear radiation factors are evaluated in the next-to-leading logarithmic approximation.
Further developments of FORM
Authors: Ueda T , Kaneko T , Ruijl B , Vermaseren J A M 
Published: July 2020

Abstract
Form is a symbolic manipulation system, which is especially advantageous for handling gigantic expressions with many small terms, as often occurs in real problems in perturbative quantum field theory. In this work we describe some main features of FORM, such as the preprocessor and $-variables with emphasizing on benefit of metaprogramming, and introduce a new feature: a topology generator.
Ntuples and compact matrix element representations
Authors: Maître Daniel 
Published: July 2020

Abstract
In this contribution I will discuss the practicalities of storing events from a NNLO calculation on disk with the view of “replaying” the simulation for a diferent analysis and under diferent conditions, such as a diferent PDF ft or a diferent scale setting. I also present a way to store a compact representation of the matrix elements for low multiplicity processes.
The Game of Triangles
Authors: Preti Michelangelo 
Published: July 2020

AbstractWe present STR (Star-Triangle Relations), a Mathematica package designed to solve Feynman integrals by means of the method of uniqueness in any Euclidean spacetime dimension. We provide a set of tools to draw Feynman diagrams and interact with them only by the use of the mouse. Throughout the use of a graphic interface, the package should be easily accessible to users with little or no previous experience on diagrams computation.
Towards an efficient method to compute two-loop scalar amplitudes
Authors: Guillet J.Ph. , Pilon E. , Shimizu Y. , Zidi M. S. 
Published: July 2020

Abstract
We report on an ongoing work initiated by Prof. Shimizu, proposing a method to numerically compute two-loop scalar integrals as sums of two-dimensional integrals of generalised one-loop N-point functions analytically computed and integrated over some simple weight functions. The analytic computation of the generalised one-loop N-point functions in a systematic way motivates a novel approach sketched in this talk.