bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mode-locked orbits, doubling of invariant curves in discrete Hindmarsh-Rose neuron model
Authors: Muni Sishu Shankar 
Published: June 2023

Abstract
Similar to period-doubling bifurcation of fixed points, periodic orbits, it has been found since 1980's that a corresponding doubling bifurcation can also be found in the case of quasiperiodic orbits. Doubling bifurcations of quasiperiodic orbits has an important consequence on the dynamics of the system under consideration. Recently, it has been shown that subsequent doublings of quasiperiodic closed invariant curves lead to the formation of Shilnikov attractors. In this contribution, we illustrate for the first time in a discrete neuron system, the phenomenon of doubling of closed invariant curves. We also show the presence of mode-locked orbits and the geometry of one-dimensional unstable manifolds associated with them resulting in the formation of a resonant closed invariant curve. Moreover, we illustrate the phenomenon of crisis and multistability in the system.
Hypergeometric viable models in f(R) gravity
Authors: Hurtado Roger , Arenas Robel 
Published: June 2023

Abstract
A cosmologically viable hypergeometric model within the framework of the modified gravity theory f(R) has been derived based on the requirements of asymptotic behavior towards ΛCDM, the presence of an inflection point in the f(R) curve, and the viability conditions dictated by the phase space curves (m, r), where m and r denote characteristic functions of the model. To examine the constraints associated with these viability criteria, the models were expressed in terms of a dimensionless variable, namely R → x and f(R) → y(x) = x + h(x) + λ, where h(x) represents the deviation of the model from General Relativity. By employing the geometric properties imposed by the inflection point, differential equations were formulated to establish the relationship between

h
′
(
x
)

and h″(x). The resulting solutions yielded models of the Starobinsky (2007) and Hu-Sawicki types. However, it was subsequently discovered that these differential equations correspond to specific cases of a hypergeometric differential equation, indicating that these models can be derived from a more general hypergeometric model. The parameter domains of this model were thoroughly analyzed to ensure its viability.
The solvability of interval-valued Abel integral equations on a time scale with trigonometric representation of parameterized interval analysis
Authors: van Phut Lai , van Hoa Ngo 
Published: June 2023

Abstract
In this paper, the concept of the trigonometric representation of parameterized interval analysis is introduced to investigate a theory of the interval-valued Abel integral equation (IAIE) on a time scale. We provide suitable conditions to show that the IAIE on a time scale is solvable. Some simple examples are given to illustrate our main result.
Gravitational waves from eccentric extreme mass-ratio inspirals as probes of scalar fields
Authors: Zhang Chao , Gong Yungui , Liang Dicong , Wang Bin 
Published: June 2023

Abstract
We study eccentric orbits of the Schwarzschild spacetime for extreme mass ratio system (EMRI) in modified gravity theories with additional scalar fields.
Due to the additional energy and angular momentum carried away by the scalar field,
the orbit of the EMRI in modified gravity decays faster than that in general relativity.
The time that it takes the eccentricity e to reach the minimum is shorter and the values of the semi-latus rectum p and e at the turning point when e reaches the minimum are bigger for larger scalar charge d.
In addition to the calculation of energy fluxes with numerical methods,
we also use the Post-Newtonian expansion of the rate of energy carried away by the scalar field in eccentric orbits to understand the behaviors of the energy emission.
By adding the scalar flux to the open code FastEMRIWaveforms of the Black Hole Perturbation Toolkit,
we numerically generate fast gravitational waveforms for eccentric EMRIs with scalar fields
and use the faithfulness between waveforms with and without the scalar charge to discuss the detection of scalar charge d. The detection error of the scalar charge is also estimated with the method of the Fisher information matrix.
Design and analysis of high dynamic actuator and implementation on quadruped robot
Authors: Liang Z J , Jiang L , Zhao J X , Xing B Y , Xu P , Su B 
Published: June 2023

Abstract
Legged robot research is increasingly pursuing higher speed and higher dynamic manoeuvrability under higher load conditions, however, it poses more stringent challenges to the design of actuator. Under the constraints of actual size and weight restrictions, designing actuators that meet the requirements of high dynamic performance has become the pursuit of many robot designers, and has even become a key factor to limit and constrain the robot’s capability boundary. This paper takes the quadruped robot as the research object, and focuses on analysing the technical requirements of actuators under various gaits and working conditions, A 3-DOF pseudo-direct-drive actuator configuration scheme based on axial magnetic field is proposed. Under the control of the designed force-position hybrid control strategy, the test results of actuator and robot prove that the designed scheme can meet the high mobility with dynamic locomotion capability of the robot.
Research on fast matching method of suspension stiffness and damping based on unmanned special vehicle
Authors: Tang Zhi-yong , Lei Xu-Dong , Liu Hua , Feng Jie , Min Feng , Long Pei , Kan Lei 
Published: June 2023

Abstract
At present, the domestic research on the matching of stiffness and damping of the suspension system of unmanned special vehicles mainly adopts the empirical method and experimental method. This method is time-consuming and laborious, which prolongs the development cycle of unmanned special vehicles. In order to improve the vehicle ride comfort and reduce the research and development time, based on the single wheel two degree of freedom driving vibration model, this paper analyzes the influence of suspension stiffness and damping on the acceleration response of vehicle body, deduces the general calculation formulas of acceleration, suspension dynamic deflection and root mean square value of wheel dynamic load, and establishes the mathematical model of the optimal damping ratio of suspension system based on driving safety and comfort, The damping ratio design of the suspension system of an unmanned special vehicle is completed. The results show that this method can quickly and accurately complete the stiffness and damping matching design of suspension system, and shorten the time of vehicle design and development.
Ideal trajectory generation method of missile formation based on Gaussian pseudo-spectrum method
Authors: Zhang Benkang , Shen Jian , Wang Xiaoguang , Zhu Qingyu 
Published: June 2023

Abstract
With the increasingly complex combat environment and the diversity of combat tasks, important military targets are surrounded by multi-layer defense. Modern information warfare pays more attention to system confrontation and multi-system cooperative operations,and missile formation to attack targets is the main research content of this paper. For missile wing ideal trajectory generation problems, ensure the attack Angle of time and meet the design requirements, Gaussian pseudo-spectral method is used to generate guarantee missile attacks within the specified time shot on target, at the same time meet the attack Angle constraint at the end of the ideal trajectory, the more missiles cooperative engagement problems into the ideal trajectory tracking problem, avoid the estimate of the remaining time of flight.The main contents of this paper are as follows:(1) Gaussian pseudo-spectral method is used to generate the ideal trajectory model.(2)Use Matlab to simulate the established model.
A Weighted Fractional Fourier Transform Signal Synchronous Method based on Delay Multiplication for UAVs System
Authors: Zhang Xiaoyu , Fan Zhenzhen , Lv Zhenbin , Yu Xi , Yu Haiyang 
Published: June 2023

Abstract
Weighted fractional Fourier transform (WFRFT) is a novel anti-interception and anti-scanning communication method, which has been used in satellite communication system. On the analysis of the WFRFT signal and its characteristics, a synchronous method of WFRFT signal based on delay multiplication is proposed. This method estimated the rotation factor sequence by using delay multiplication, and demodulated the information by the estimated parameters. In addition, numerical simulations on AWGN channels are conducted to evaluate the performance of the proposed method according to average Bit-Error-Rate (BER) in different conditions of Signal-Noise-Rate (SNR). The simulation results show that the proposed method can effectively estimate the parameter and complete signal synchronization reliably.
Research on optimization and simulation of coordination of fuze and warhead for attack UAV based on damage trace model
Authors: Guo Yiran , Yang Chengwei , Li Juan , Mao Ruizhi , Guan Zhenyu , Li Jie , Chen Zihao , Li Jichu , Li Jiangtao , Ye Bobo 
Published: June 2023

Abstract
Facing the needs UAV of achieving intelligent and efficient damage for attack UAV in combat operations, there is a lack of research on the coordination of fuze and warhead for attack UAV considering the damage model and terminal trajectory correction. This paper proposes a novel method of the coordination of fuze and warhead to optimize the damage efficiency. A pilot-fight coordination simulation experiment is conducted under a certain actual combat background in the end. The method firstly gets the optimal detonation position and attitude results based on the simulated annealing algorithm and damage trace model. Then based on the trajectory planning results using the three-dimensional Dubins algorithm, the autonomous maneuver to the optimal detonation position and attitude considering the maximization of the damage effect are realized. The process of initiating battle and coordination is verified, and the feasibility and optimization effect of the developed algorithm are demonstrated. The research of this paper will also provide a new solution for the attack UAV pilot-fight operation control technology in practical application.
Integrated Guidance and Control Design for Guided Projectile Using Sliding Mode Method
Authors: Guan Jun , Yi Wenjun 
Published: June 2023

Abstract
According to the characteristics of special launch and flight environment such as high dynamic and large disturbance of guided projectile, the separate design method of traditional guidance system and control system will bring large errors, even affect the stability of the system, and the accuracy of projectile hitting the target is poor. In this paper, the guidance and control integrated control law of guided projectile is designed based on the sliding mode variable structure theory. The correctness, accuracy and stability of the designed control law are verified by numerical simulation. Numerical simulation shows that the guidance control integrated control law designed by sliding mode control theory can still have high control accuracy in the case of large perturbation. At the same time, Monte Carlo simulation shows that this method can meet the needs of engineering.
Research on Individual Performance Index of Air Cluster Combat Aircraft Based on Differential Game Theory
Authors: Liu Lei , Zheng Yuanxun , Lu Xinran , Du Lei 
Published: June 2023

Abstract
UAV cluster has the characteristics of low cost, large-scale and high autonomy, and has gradually become a new research direction in the field of military intelligence, and is widely used in combat tasks such as penetration reconnaissance, lure interference, large-scale saturation attack and regional sealing and control. Therefore, air cluster confrontation will become one of the main melodies of air combat in the process of confrontation, cluster aircraft individual performance index determines the overall cluster level, poor individual performance will make the cluster cannot effectively complete the task, excellent individual performance completes the task, but will bring the increase in the cost of cluster, so in the air cluster confrontation scenario, according to the target performance reasonable our individual performance has become important. Based on the innovative differential game theory, this paper studies the effective interception of the aircraft in the cluster high dynamic pursuit scenario, studies the relationship between the individual performance of the interceptor aircraft and the target aircraft, and effectively provides reference for the overall index design of the aircraft in the military field.
Dual-environment-driven MEMS pyrotechnic actuators
Authors: Li H , Luo J J , Xu X , Feng C Y , Liu T , Gao Y Y 
Published: June 2023

Abstract
In this paper, through the research on the driving mechanism and structure design of the MEMS silicon-based actuator that can realize the dual-environment force release function, a MEMS actuator that can be released from the dual-environment is designed. It is based on the mass-gear mechanism (inertial drive) centrifugal force drive design. The actuator can achieve 1.5mm output displacement under the control of 10V DC voltage, under the condition that the centrifugal is not less than 5000 r/min, it can realize the safety release function, and can resist overload 10000g. The micro-detonation device has a high degree of integration, initially realizes the function of releasing the force of the silicon-based inertial environment, and has good compatibility with MEMS technology.
Redundant architecture design and Human-machine system analysis of active side stick control system
Authors: Jian Li 
Published: June 2023

Abstract
This paper describes the advantages and disadvantages and principle of passive side stick and active side stick respectively. A redundant architecture of active side stick control system is proposed according to top-level function and safety requirements. The control unit with active-standby control channels, which has dissimilar command-monitoring hardware, can significantly improve the safety performance. Finally, the high angle of attack protection and high-speed protection of active side stick control system has been tested on one civil aircraft simulation platform, and it proves that the active side stick control system can effectively realize the tactile and warning function of envelope protection.
Research on high-speed bounding gait analysis and control of quadruped robot
Authors: Jiang L , Liu Y F , Wang Z R , Xing B Y , Tian C , Xu P , Liang Z J , Zhao J X 
Published: June 2023

AbstractIn order to improve the performance of the quadruped robot, the impact of high-speed gait is an important target to measure the performance of the robot. This paper elaborates the research methods of high-speed gait movement of quadrupeds, and a multi-rigid-body dynamics modelling method is presented. According to the analysis of high-speed bounding gait, the dynamic modelling of quadruped motion system is calculated. The motion planning for a rigid-torso quadruped robot based on Poincare Map is presented, and the high-speed bounding gait motion control strategy is established. The simulation experiments have been carried out, and the results have demonstrated the effectiveness of the motion planning model and high-speed bounding method.
Computational simulation study on disturbance of six-rotor UAVs due to ammunition launch
Authors: Zhenxiong Wang , Kai Kang , Xueying Hao , Huanming Hao , Jianghai Liu , Lang Cao 
Published: June 2023

Abstract
According to the multi-body dynamics theory, we analyzed and derived the influence laws of the ammunition launch angle, launch timing, mounting position, and mass on the stability of unmanned aerial vehicles (UAVs) by establishing a flight dynamics model of a six-rotor UAV in the process of ammunition launch. The analyses indicated that the ammunition launch angle, the longitudinal mounting position, and the multi-round ammunition launch timing significantly affect the disturbance of the UAV. When single-round ammunition is launched, selecting the appropriate ammunition mounting position can reduce the disturbance amplitude of the position of the UAV, and when multi-round ammunition is launched, the launch timing significantly affects the overall stability of the UAV. On the basis of the overall system and ammunition-related parameters, the optimal launch timing for different deployment methods can be derived. Through modeling analysis, we can qualitatively study the stability of the system during ammunition launch, providing a reference for the design of the ammunition launcher structure and the strike timing.
Study of External Energy Gun Automata Firing Control Based on Permanent Magnet Synchronous Motor
Authors: Li Changhong , Han Chongwei , Ma Jie , Zhang Gaosheng , Zhu Chao 
Published: June 2023

Abstract
In this paper, an external energy gun automata firing control method based on permanent magnet synchronous motor (PMSM) is presented. Firstly, on the basis of PMSM voltage equation and coordinate transform, current loop decoupling controllers are derived via the expected current closed loop time constant. The d-axis current and q-axis current can be tuned independently. Through the given mid-frequency interval criterion, the PMSM speed control method can be designed. Secondly, in order to implement the external energy gun automata firing control, the combined angle according to PMSM position and its over one circle count is solved first. The position controller is designed via Lyapunov stable theory. Last, an experiment is executed on a real external energy gun automaton and a PMSM position control system to verify the proposed method. The firing rate and firing shells length can be controlled. In order to decrease the firing rate without decrease PMSM speed, multiple single shells fired with given interval method can also be established and achieved. The experiment results verify the effectiveness of the proposed approach.
Terminal Explosion Power Test Flight Platform of Warhead
Authors: Hu Yunfei , Li Kang 
Published: June 2023

Abstract
Aiming at the shortcomings of high risk, high cost, low landing speed and low attitude accuracy of warhead terminal dynamic performance test, a low cost, recyclable and modular warhead terminal explosion power test flight platform is proposed. The overall scheme of two-stage flight is constructed, and the aerodynamic load of the flight process is analysed. In addition, the flight trajectory is designed. The numerical simulation results show that the flight platform can send the warhead to the specified test window, accurately control the drop velocity and attitude of the warhead in the test window, simulate the real flight environment of the warhead and the motion law of the terminal point. Therefore, the flight platform can realize the terminal explosion power test and test of the subsonic and supersonic warheads, providing technical support for the development of the warhead.
Modern Logistics Technology Based Ship Segment Outfitting Scheme
Authors: Qie Jinbo , Miao Yugang , Huang Minjian , Xie Ziming , Xie Xin 
Published: June 2023

Abstract
Shipbuilding occupies an important position in national defense and economy, which belongs to a typical large-scale complex production. In the modern shipbuilding mode, the segment outfitting process is the bottleneck of the whole shipbuilding. The outfitting cycle is long, and there are many resource constraints in the process. At present, China’s shipbuilding enterprises adopt the method of storage-yard based segment outfitting, which is relatively extensive in management and low in efficiency. This article points out that storage-yard based segment outfitting depends on complex dynamic scheduling, involving complex theoretical planning problems such as three-dimensional spatiotemporal coordination and flatbed transporter scheduling. Inspired by the segment outfitting line proposed in Germany and the modern logistics technology, the station design of the segment outfitting line was determined, and the centralized distribution with the intelligent logistics mode of outfitting parts is analyzed. The material and personnel coordination framework of the segment outfitting line is established. In the end, an assembly line based collaborative scheme of ship segment outfitting is proposed, with the characteristics of plan oriented, comprehensive perception, and dynamic synergistic.
Effects of pulse current waveform on electromagnetic railgun considering the eddy current effects
Authors: Li Yanzhao , Li Haiyuan 
Published: June 2023

Abstract
This paper investigates the effects of pulse current waveform on electromagnetic railgun considering the containment eddy current effects. First, a three-dimensional transient finite element model of the railgun with a metal containment and a pulse current waveform control model with constant feed energy are established. Then, taking the eddy current effect into account, the effects of different waveforms with constant feed energy on the eddy current, the rail current, the armature propulsive force, the rail repulsive force, the eddy current energy consumption, and the muzzle kinetic energy are analyzed. Finally, the simulation shows that reducing the slope of the rising edge of the pulse current can effectively suppress the eddy current and improve the muzzle kinetic energy. When the amplitude and the slope of the rising edge are determined, the excessively long flat top section will lead to more serious eddy current concentration at the ending moment of discharge, more eddy current loss, and less muzzle kinetic energy. Too high or too low amplitude of the pulse current is not conducive to the improvement of the muzzle kinetic energy. The investigation of this paper provides some references for the design of electromagnetic railgun and the selection of pulse current waveform.
Study on ballistic performance of metal matrix ceramic ball composite
Authors: Wang J H , Shi X M , Wang Q , Xia X , Fang X Z , Zeng T , Zhang L J , Ye C J 
Published: June 2023

Abstract
Different metal matrix ceramic composite plates were manufactured using different diameter ceramic balls. The ballistic resistance of these composite plates were investigated by firing 12.7mm, 25mm armor-piercing incendiary (API), and 200 standard explosively formed projectile(EFP). The tests results showed that these ceramic balls with higher mechanical properties performed better ballistic resistance, in the meantime, there was a correlation between diameters of the ceramic balls with projectile caliber. The quality protection factor of composite plate using 2mm diameter ceramic ball against 12.7mm armor-piercing incendiary (API) is better than 2.2; The mass effectiveness factor of composite plate using 6mm diameter ceramic ball against 25 mm armor-piercing incendiary (API) is better than 1.7; The quality protection factor of composite plate using 6mm diameter ceramic ball against 200 standard explosively formed projectile(EFP) is better than 3.5.