bluuebunny/crossref_metadata_2025 huggingface dataset:
The FAST Galactic Plane Pulsar Snapshot Survey. VI. The Discovery of 473 New Pulsars*
Authors: Han J. L. , Zhou D. J. , Wang C. , Su W. Q. , Yan Yi , Jing W. C. , Yang Z. L. , Wang P. F. , Wang T. , Xu J. , Cai N. N. , Sun J. H. , Yang Q. L. , Xu R. X. , Wang H. G. , You X. P.
Published: December 2024

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the most sensitive telescope at the L-band (1.0–1.5 GHz) and has been used to carry out the FAST Galactic Plane Pulsar Snapshot (GPPS) survey in the last 5 yr. Up to now, the survey has covered one-fourth of the planned areas within ±10∘ from the Galactic plane visible by FAST, and discovered 751 pulsars. After the first publication of the discovery of 201 pulsars and one rotating radio transient (RRAT) in 2021 and 76 RRATs in 2023, here we report the discovery of 473 new pulsars from the FAST GPPS survey, including 137 new millisecond pulsars and 30 new RRATs. We find 34 millisecond pulsars discovered by the GPPS survey which can be timed with a precision better than 3 μs by using FAST 15 minute observations and can be used for pulsar timing arrays. The GPPS survey has discovered eight pulsars with periods greater than 10 s including one with 29.77 s. The integrated profiles of pulsars and individual pulses of RRATs are presented. During the FAST GPPS survey, we also detected previously known pulsars and updated parameters for 52 pulsars. In addition, we discovered two fast radio bursts plus one probable case with high dispersion measures indicating their extragalactic origin.
Research on extraction resistance of the certain automatic gun based on projection pursuit method
Authors: Liu D , Bai C J , Zhang S M , Tang P B , Wang H J , Zhao J Y
Published: December 2024

The extraction resistance is the key factor in restricting the continuous firing of the certain automatic gun automaton. The coupling effects of plastic deformation, contact, friction, thermal expansion and inertia during the extraction process are not easy to analyze the factors affecting the extraction force of automatic gun. Therefore, the problem that excessive extraction resistance in the firing process of automatic guns causes the automaton to slow down or even stop firing, the projection pursuit method is used to quantitatively classify and evaluate the extraction resistance of automatic guns to improve the accuracy and objectivity of the analysis of affecting factors. An evaluation index system of hull extraction resistance of automatic gun was established based on the classification of influencing factors, influencing indicators and characteristic values of influencing indicators. An evaluation model was formed with the characteristic values of influencing indicators of hull extraction resistance as the sample set, and the weights of each influencing index were obtained, which with higher weights were consistent with the key indicators considered in the design process of automatic gun automata. The comprehensive evaluation sequence of the extraction resistance of the certain automatic gun under several design parameters is obtained, and the evaluation results are verified by finite element simulation method, which provides an important reference for the design of automatic gun.
Adaptive-Extended-State-Observer-Based Robust Control of Electrohydraulic Missile Launcher With Disturbances Rejection
Authors: Zhao Gaoyang , Zhu Weilin , Wang Jinyuan , Yao Jianyong , Sun Hui , Zhou Ning
Published: December 2024

In this paper, a disturbance-compensated robust controller was used for electrohydraulic missile launchers with the aim of improving the motion accuracy of the system. In the case of both matched and unmatched disturbances, adaptive extended state observers were employed in order to estimate unmodelled disturbances, external disturbances, and so forth. It was thus resolved to implement a feedforward compensation mechanism in order to counteract the effects of unknown disturbances, based on online estimates of the disturbances with the intention of enhancing the performance of the proposed controller. In addition, in order to address the problems of difficulty in obtaining the differential value of the virtual control law and “Curse of Dimensionality”, an improved first-order sliding-mode differentiator (IFOSMD) was employed. The theoretical analysis demonstrated the stability of the multi-observer and the closed-loop system under the proposed control scheme. The efficacy of the controller was demonstrated through the utilisation of numerical simulations.
Design and simulation analysis of electromagnetic gun feeding and conveying device
Authors: Pei Changgui , Liu Xin , Zhou Xiaozhi
Published: December 2024

The electromagnetic gun is a new type of weapon equipment powered by electric energy. Compared with the traditional artillery, the electromagnetic gun has the obvious advantages of high and controllable initial velocity, no explosive in the bore, and high safety. It is a new concept weapon that will be developed in the future. At present, there are many researches on the launching mechanism of electromagnetic gun, but the related research on the matching ammunition supply system is not yet mature. Therefore, in this paper, aiming at the characteristics of electromagnetic gun without propellant, through the comparison and selection of various ammunition supply system schemes, the ammunition supply scheme of horizontal magazine was determined, and the structural design and strength check were carried out to complete the model of each component and the overall assembly of ammunition supply system. After that, the finite element method was used to check the strength of the sprocket, and the dynamic simulation analysis of the ammunition supply system was carried out, so as to complete the design work of the whole ammunition supply system. This paper provides a certain reference for the development of electromagnetic gun feeding system.
Thermodynamic Modelling and Analysis on Pneumatic Recuperator of Artillery Based on Energy Equation
Authors: Chen Liang , Guangsong Chen , Linfang Qian
Published: December 2024

In order to model recoil motion of artillery elaborately, the pneumatic recuperator was modelled and analyzed by thermodynamic theory, and a recuperator force model based on energy equation was proposed. The thermal power, mechanical power and gas equation of state were considered. Comparison with the classical recuperator force model based on polytropic process, the change of gas state with time is directly considered in this model. The effectiveness of the model was verified based on firing experiment data of a soft recoil artillery, and numerical analysis was carried out based on a normal recoil artillery. The results show that the recuperator force model based on energy equation can describe the hysteretic nonlinear properties of the gas state, and can predict the changes of gas pressure and temperature at the end of firing process relative to the start.
Adaptive Prescribed-Time Nonlinear Control for Chain Magazine
Authors: Li Pengfei , Ma Jiahua , Chen Wei , Hu Jian , Deng Wenxiang , Luo Minzhou , Yang Xiaowei
Published: December 2024

To address the issue of the chain magazine system failing to achieve stability within a specified timeframe during operation and to enhance the precision and robustness of its performance, an adaptive prescribed-time robust controller (APTRC) was designed for position control of the chain magazine. The newly introduced controller enables the system to reach stability within the designated time, regardless of initial conditions, thereby improving the robustness of control system against uncertainties and external disturbances. The stability of the controller itself and the closed-loop system was verified using the Lyapunov stability criterion. Simulation results indicate that the controller achieves the desired performance with high control accuracy under three different load conditions: no load, half load, and full load.
Research on the Impact of Rocket Salvo with Different Launch Spacings on Launch Containers
Authors: Guo Zhangxia , Yang Fengyi , Xie Jingyun
Published: December 2024

In the case of a multiple-launch rocket system firing in salvo, the rocket gas jet with different spacing will have different effects on the launch box. In this paper, the multi-barrel rocket launcher launch box was taken as the research object, and the development process of the double-launched and four-launched rocket gas jet impinging launch box under different spacing was numerically simulated. The results showed that under the double salvo, with the increase of the emission spacing, the speed of the gas jet increased, the degree of mutual interference decreased, and the surface pressure on the launch box gradually decreased. A smaller emission spacing would form a stronger airflow interference. The change trend of the four-shot salvo was similar to that of the double-shot salvo, and the change of the phenomenon is more obvious. This study provides a useful reference for further understanding the salvo law of rocket launcher and provides strong support for improving the performance of rocket launcher.
Comparison Study of 155mm Caliber Howitzer Barrel Rifling Depth
Authors: Yan Lijun , Xu Yaofeng , Zhang Shiquan , Yang Diao , Wang Yan , Lei Xin
Published: December 2024

Rifling depth is a very important parameter of howitzer barrel design, which has great influence on howitzer firing performance and security. At present, there are two types of barrel rifling depth design, which are 1.27mm depth rifling and 2.3mm depth rifling. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and the rifling depth of projectile. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and rotating driving side force when deep rifling howitzer and shallow rifling howitzer are used. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and rotating driving side force when deep rifling howitzer and shallow rifling howitzer fires unguided projectiles and guided projectiles. It can be found by comparison that shallow rifling howitzer does better. It can be found by comparison that shallow rifling howitzer does better that deep rifling howitzer in barrel life and guided projectile firing security. Research of this paper will produce an important meaning to our nation’s next generation howitzer.
Simulation Analysis of Large Caliber Howitzer Barrel Forcing Cone Structure
Authors: Yan Lijun , Xu Yaofeng , Zhang Shiquan , Yang Jianwei , Guo Junhang , Lei Xin
Published: December 2024

Forcing cone, whose function is mainly to accommodate bearing band of projectile, is an important design parameter of howitzer barrel design. Forcing cone’s taper directly influences engraving resistance of projectile and wear of starting part of rifling. So structure design of forcing cone is very important to barrel life. So structure design of forcing cone is very important to barrel life. This paper simulates nine types of forcing cone structure and analysis the results. Based on the simulation results, the best forcing cone scheme is closed. This research will provide support to our nation’s next generation 155mm caliber howitzer.
Research on anti-UAV target allocation based on clustering algorithm
Authors: Chi Zhang , Yongliang Yang , Chun Zhang , Haorui Wang , Xiangang Sun
Published: December 2024

With the rapid development of fixed-wing and rotary-wing small tactical UAVs in recent years, cluster attacks based on small tactical UAVs have become one of the main threats to the current air defense system. In the context of the increasing threat of cluster UAVs to air defense in the future, this paper takes the fight against cluster UAVs as the combat goal and the coordinated air defense combat as the combat means. Through clustering algorithm, a large number of cluster UAVs are divided into combat groups, so as to avoid the time waste in switching when switching fire. After simulation analysis, the algorithm has certain guiding significance in improving the efficiency of anti-cluster UAVs.
Analysis of mechanical properties of cased telescoped ammunitions during firing
Authors: Zhang S M , Liu D , Bai C J , Ma C Y , Wang H J , Wang G B
Published: December 2024

In order to solve the cartridge extraction problem of cased telescoped ammunitions, a study was conducted on the dynamic process of cartridge during launching. The finite element simulation model is established firstly to analyse the mechanical properties of the cartridge during launching. Then the radial residual deformation and cartridge extraction force of the cartridge after chamber pressure unloading were obtained. Meanwhile, the effect of different yield limits of cartridge materials on the extraction performance was studied. The results show that as the yield limit of the cartridge increases, the maximum radial residual deformation first increases and then gradually decreases after unloading the chamber pressure, and the extraction force of the cartridge also shows the same trend. When the yield limit of the cartridge is greater than 1040 MPa, the extraction force goes to zero after pressure unloading, and the cartridge can be easily extracted.
Artillery servo system auto-coupling PID control based on improved dung beetle optimizer
Authors: Shen Kai , Han Chongwei , Liu Ye , Zhang Yue , Hu Xin , Zhao Xin , Dai Pu , Hao Qikai , Zhang Ziluo
Published: December 2024

This paper proposes an auto-coupling PID (ACPID) control strategy based on the improved dung beetle optimizer (IDBO) in light of the complex control problems, including nonlinearity, external interference, and internal uncertainty, encountered in artillery servo systems. First, an artillery servo system mathematical model was created. Second, we modified the dung beetle optimizer (DBO) algorithm by incorporating a Levy flight and mutation mechanism, an adaptive weight-changing spiral search approach, an enhanced boundary convergence factor, and PWLCM chaotic mapping. They made convergence go faster, convergence accuracy go higher, and the algorithm’s capacity to avoid local optima and global search got better. Next, we utilized IDBO to optimize ACPID’s speed factor. Finally, the simulation results demonstrated the potential applicability of IDBO-ACPID control in the field of artillery servo control, as evidenced by its quick response time, high control accuracy, strong anti-disturbance ability and robustness.
Visual Explanations from Deep Convolutional Networks for Aerial Image based on Confidence Enhancement
Authors: Song Xue , Congli Li , Zhe Wei , Yongfeng Liu
Published: December 2024

In recent years, the operational mechanism of decision processes in convolutional neural networks has prompted researchers to conduct in-depth research, and formed a visual interpretation theory method based on saliency map. This paper presents a deep convolutional network vision explanations method for aerial images. In this method, the gradient map of neural network is reconstructed by the “Increase of Confidence”, and the saliency map is obtained by combining the weight parameters. The experimental results show that compared with the classical visual interpretation methods, this paper has good subjective visual effect, achieves the best in the two indicators of Average Drop and Average Increase, and has more accurate positioning ability.
Mission Planning Method of Heterogeneous Reconnaissance System Based on Simulated Annealing Algorithm
Authors: Weidong Huang , Qinqin Wang , Junjie Li , Shiseng Jia , Xiaofeng Xu
Published: December 2024

The current methods of reconnaissance mission planning are studied, and the shortcomings of the current methods of heterogeneous reconnaissance mission planning are analyzed. A task planning method based on simulated annealing algorithm is designed, which has the optimal choice of task completion time and path. After defining the time constraint, the passage restriction, the reconnaissance coverage and the platform steering angle constraint, The problem is abstracted as an optimization mathematical problem. At the same time, the problem that the simulated annealing algorithm is easy to fall into local optimum is solved through the scattering point operator. The results show that the algorithm can achieve the autonomous mission planning capability of eight unmanned platforms.
Video Stabilization based on Sub-pixel Keypoints
Authors: Zhong Bihua , Wang Fangyi , Liu Tao , Liu Chengyi , Bai Hongyang , Wan Gang
Published: December 2024

With the continuous advancement of seeker technology and image processing techniques, the precision of guided weapons has increasingly improved. However, due to the rigidly fixed structure between the seeker and the guided weapon, the weapon is prone to experiencing disturbances and vibrations during flight, which can deteriorate the real-time video quality monitored by the seeker and, consequently reduce the precision of the guided weapon. To enhance the precision of guided weapons, it is necessary to mitigate the adverse effects of vibrations through video stabilization techniques. This paper proposes a video stabilization framework based on sub-pixel keypoints detection. It utilizes a lightweight network to detect keypoints, employs the Lucas-Kanade (LK) optical flow method for motion estimation, and smooths the camera’s motion path with an adaptive filter. Experimental results show that the proposed algorithm has an average processing time of approximately 0.2s per frame, achieving a stability index of 0.9262, a PSNR index of 22.3074, and an SSIM index of 0.7188. This demonstrates a balanced performance in terms of computational efficiency and stabilization, exhibiting excellent comprehensive performance.
A Classification Method for Multichannel MI-EEG Signal with FPCA and DNN
Authors: Hou Yunhui , Shen Na , Lin Yubin
Published: December 2024

A new accurate identification method has been proposed to address the lack of interpretability in current deep learning-based feature extraction methods for motor imagery electroencephalogram (MI-EEG) signals. This method combines functional principal component analysis (FPCA) and deep neural networks (DNN) for four classifications of MI-EEG signals. The process involves preprocessing the acquired MI-EEG signals and obtaining power spectral density (PSD) versus frequency curves in the alpha band for multiple channels and samples through FIR filtering. All PSD-frequency curves are then functionally smoothed according to the theory of functional data analysis (FDA). Feature parameters are derived using FPCA, and the parameters of all samples are normalized. Training samples are selected randomly for clustering training with DNNs. Category prediction is carried out on the test data classification samples. This method is applied to 4×120 four-categorized MI-EEG samples, each from six channels obtained from Enobio test, a wireless EEG system from Spain Neuroelectrics, involving left hand, right hand, left foot, and right foot motor imagery at a sampling rate of 500Hz. 80% of the samples were used for training, and the remaining 20% were used for testing. The prediction accuracy ranged from 84.3% to 91.66%. While this multivariate feature parameter extraction method has clear mathematical and physical significance, it does demand a high sampling rate of 500Hz.
Enhancing Artillery Barrel Wear Detection via CRNN-Based Acoustic Analysis and Domain Adaptation
Authors: Qi Wanlong , Liu Jiancheng , Gou Yingdong , Han Zaikun , Li Bo , Wang Kexin
Published: December 2024

The wear of artillery barrels directly impacts the accuracy and firepower of weapon systems, and precise detection of barrel wear is paramount for enhancing military capabilities. This study proposes a sound-based method for detecting artillery barrel wear, aimed at addressing the challenges of invasiveness and inefficiency in traditional methods, as well as the high cost and resource demands of modern approaches. We introduce AcouDAR, an end-to-end adaptive framework designed to elevate information extraction capabilities through the integration of time convolutional networks (TCN) and bidirectional gated recurrent units (Bi-GRU). Additionally, a domain adaptation module comprising domain alignment and domain relevance elimination modules is incorporated to mitigate the model’s reliance on specific historical sound data of artillery barrels and to bolster its adaptability in real-world scenarios. Extensive experimentation validates the superior performance of the AcouDAR model in detecting artillery barrel wear.
Simulation study of aerodynamic ablation characteristics of ballistic missile laser fuzes
Authors: Zha Jipeng , Chen Shuai , Hao Yufeng , Zhang Xiangjin
Published: December 2024

When a ballistic missile re-enters the atmosphere at hypersonic speed, the warhead and the incoming flow have a violent effect, resulting in a rapid increase in the air temperature of the surrounding flow field, and the persistent high temperature will make the optical window of the ballistic laser fuzes appear ablation phenomenon, which seriously affects the ranging accuracy of the laser detection system. In this paper, the optical window of the laser fuze is taken as the research object, quartz glass is chosen as the optical window material, and the thermal response of the optical window of the laser fuze detection system is numerically simulated according to the heat flux density parameter of the ballistic missile when it re-enters the atmosphere. The simulation results show that the quartz glass as the optical window has good ablation resistance and thermal insulation performance.
Effect of Phenolic Resin Pyrolysis on Thermal Properties of SiFRP Composites under High Heating Rates
Authors: Meicong Wang , Xin Yang , Jixiang Shan , Yonggang Lu , Yanru He , Zhiwei Ding , Yupeng Hu
Published: December 2024

During the ablation process of resin-based composite materials, residual carbon generated from pyrolysis of phenolic resin change the thermal performance of the material. Phenolic resin pyrolysis process depends on temperature and heating rate. Based on the mass loss curves of phenolic resin under high heating rates (5K/s, 50K/s, 100K/s), the study analyzes the variations in thermal performance parameters of SiFRP composite materials with temperature assuming phenolic resin and silica fibres are in parallel in heat transferring. As temperature rising, the pyrolysis conversation ratio of phenolic resin increases, thermal conductivity and specific heat capacity of the composites increase accordingly. The greater the heating rates, the smaller the change of thermal conductivity and specific heat capacity of composites at the same temperature. The complete pyrolysis temperature of phenolic resin is positively correlated with the temperature rise rate. When the temperature rise rate is very large (such as 100K/s), the influence of pyrolysis on the thermal properties of composites can be ignored at medium and low temperature.
Research on Thrust and Drag Matching in Modal Transition Segment of Combined Power Aircraft
Authors: Xie Mutian , Liu Demian , Gong Zheng
Published: December 2024

Combined power aircraft often experience altitude and speed loss during the modal conversion phase due to mismatches in thrust and drag. To address this issue, a thrust-drag matching strategy using the interior-point method was developed, optimizing the objective function with throttle constraints to minimize these losses. A six-degree-of-freedom model was created on the MATLAB/Simulink platform to analyze the aircraft’s dynamics. To resolve longitudinal and lateral instability during conversion, a stabilizing control law using pitch rate, roll rate, and yaw rate was introduced. The reliability of this control law was verified through modal characteristic analysis. Monte Carlo simulations demonstrated that the proposed thrust-drag matching strategy ensures successful modal conversion even under disturbances, validating both the robustness of the control law and the rationality of the strategy.
Low illumination image enhancement based on improved CLAHE algorithm
Authors: Tianyang Zong , Lei Yang
Published: December 2024

In the case of low light, the target features will be weakened or even disappear, thus affecting the target detection effect based on aerial images. In order to improve the image effect, an improved CLAHE algorithm is designed. In the process of image enhancement, the CLAHE algorithm is improved according to image pixel size and histogram characteristics, which can improve the smoothness of CLAHE algorithm for uniform color parts. The experimental results show that the improved CLAHE algorithm is better than other histogram equalization algorithms, and the method has low cost and practical application value.
The simulation of MMV fuze echo characteristics in rainfall based on Monte Carlo
Authors: Yang Bing , Liang Yanbin , Shi Xiaoshan , Liu Chunhua , Huang Zhonghua
Published: December 2024

To enhance the adaptability of millimeter wave (MMV) fuzes in rainy conditions, the attenuation and scattering impacts of rainfall was conducted. Furthermore, a mathematical model was formulated to study the characteristics of MMV fuze echo signals under rainfall environments, and the MMV fuzes echo signals are simulated based on the Monte Carlo method. The results show that rainfall leads to a substantial increase in the bottom noise of the echo signal, and the rainfall backward scattering signal mainly exists in the low-frequency region, but even in the heavy rain and rainstorm environment, the MMV fuze proximity ranging effect is basically unaffected. The results of the study can provide a reference basis for the adaptability of MMV fuze to complex environments.
Design of Anti-Interference Ultra-Wideband Fuze Waveform Based on Chaotic Pulse Position Modulation
Authors: Wu Kaiwei , Hao Shijun , Liu Chunhua , Shi Xiaoshan , Huang Zhonghua
Published: December 2024

In modern warfare, the increasingly complex electromagnetic environment and the enhanced capabilities of intelligent jamming techniques pose a threat to the survival rate of radio fuzes on the battlefield. To improve the anti-jamming performance and thereby enhance the battlefield survivability of radio fuzes, this paper proposes a chaotic pulse position modulation (PPM) method for ultra-wideband (UWB) radio fuzes based on nonlinear mapping. Simulations validate that the proposed method exhibits better autocorrelation characteristics and superior anti-jamming performance compared to unmodulated UWB radio fuzes.
Underdetermined blind source separation method of high-power microwave signals based on parametrically optimal variational modal decomposition
Authors: Zhang Chenyang , He Rong , Wang Shaoxiang , Zhang Xiangjin
Published: December 2024

Reconnaissance and identification of enemy military targets in modern battlefields are becoming increasingly difficult. A high-power microwave signal separation method based on parameter-optimal variational modal decomposition (VMD) is proposed. Firstly, three different electromagnetic signals are mixed with high-power microwave signals and superimposed with additive Gaussian white noise as the mixed signals, and at the same time, a cubic nonlinear function and a limiting threshold function are introduced to process the mixed signals to simulate the complex battlefield electromagnetic signals intercepted by the receiver. Secondly, the Sparrow Search Algorithm (SSA) is used to globally optimize the decomposition parameters of the VMD algorithm, which decomposes the single-channel observation signal into a number of eigenmode functions. The VMD algorithm decomposes the single-channel observation signal into several intrinsic mode functions, then reconstructs the multidimensional observation signals, performs the singular value decomposition of the autocorrelation matrix of the multidimensional observation signals, estimates the number of source signals of the single-channel observation signals and calculates the correlation coefficients of the Intrinsic Mode Functions (IMFs) with the single-channel observation signals, so as to reconstruct the multichannel observation signals. Finally, the Joint Approximate Diagonalization of Eigenmatrices (JADE) algorithm is used for blind source separation of the multichannel observation signals. Simulation results show that the correlation coefficient between the separated signal and the high-power microwave source signal obtained by this method is 0.9015, and the method has good effectiveness and feasibility.
Camouflaged target detection based on infrared saliency map and visible image fusion
Authors: Zhang Tianyuan , Peng Ruihui , Sun Dianxing , Lai Jie , Huang Yasheng , Du Yun
Published: December 2024

In order to effectively improve the detection ability of camouflaged targets and fully utilize the potential of target detection algorithms, this paper proposes a camouflaged target detection method based on the fusion of thermal infrared saliency map and visible image. Firstly, the saliency map of the target’s infrared band is obtained through the instance segmentation network dedicated to the camouflaged target, and then the saliency map is fused with the target’s visible image with pixel-level weighting, thus obtaining the fused image of the same target in two bands, and this fusion method is aimed at the enhancement of specific regions of the camouflaged target. The target detection by YOLOv8, the experimental results show that the method of this paper has a significant improvement in image detection performance, can effectively improve the recognition ability of camouflage targets.
Research on dynamic response behavior of the fuze with a combined fuze-warhead structure under different impact positions of bullets
Authors: Wang Qiang , Niu Lanjie , Fan Chenyang , Qv Zhuojun , Xv Rui
Published: December 2024

Aiming at the problem of unclear fuse detonation response in the process of different positions of the bullet impact detonator, to carry out research on the dynamic response behaviour of the fuse under the difference of the bullet impact position of the fuze-warhead combination structure. Through experiments and LS-DYNA numerical simulation, the influence of different positions of bullet impact booster on fuze reaction level and output pressure is analyzed. The results demonstrate that in the tests where the bullet made contact with the centre of the fuse, transmitting an explosive charge, the velocity of the bullet is 832 m/s, and the fuse exhibits a partial detonation level in response to the impact. The highest fuse response level occurs when the bullet strikes the centre of the pyrotechnic charge - partial detonation, the lowest fuse response level occurs when the bullet strikes the upper side of the pyrotechnic charge - burning, and the fuse response level occurs when the bullet strikes the lower side of the pyrotechnic charge - deflagration or explosion. The maximum fuse output pressure when the bullet strikes the centre of the pyrotechnic charge - 6.09 GPa, the minimum fuse output pressure when the bullet strikes the upper side of the pyrotechnic charge - 0.98 GPa, and the fuse output pressure when the bullet strikes the lower side of the pyrotechnic charge is 2.76 GPa.
Joint radar and communication based on piece-wised LFM signals
Authors: Wang Xin , Du Yingsen , Zhang Xiang , Wu Dan , Zhang Ke
Published: December 2024

Existing joint radar detection and communication(JDC) systems suffer from high peak-to-average power ratio(PAPR) or distance blind spot zones. In this paper, we present a novel JDC system based on piece-wised linear frequency modulation(LFM) signals. Based on the proposed piece-wised LFM modulation signal, the novel JDC system can achieve linear frequency modulation continuous wave(LFMCW) detection, and the PAPR and blind zone issues are solved. Besides, spread spectrum communication can be simultaneously conducted with the same modulation signal. Simulation results show that the proposed JDC system has similar detection performance to the traditional sawtooth LFMCW detection scheme, and the bit-error rate of communication is less than 10−6 when the the bit rate is 500kbps and the signal-to-noise ratio is 10 dB.
A study of effect of temperature and shock coupled loading on the response characteristics of fuze cook-offs
Authors: Huifeng Ban , Chenyang Fan , Zhuojun Qu , Ruifeng Liu , Rui Xu
Published: December 2024

To understand the effects of temperature and shock loading environments on the response characteristics of typical fuzes, temperature loading and combined temperature-impact loading tests were carried out to study the influence of environmental load on typical fuzes. The damage characteristics of the detonator under the coupling of temperature and temperature-impact load were analyzed by SEM, and the response characteristics of the fuze under different loading conditions were studied. The results show that the single high and low temperature storage and drop environments do not have a significant effect on the fuze casing; the temperature-overload coupling loading test intensifies the reaction degree of insensitive fuzes in the slow cook-off test, and the influence of low temperature environment is the most significant.
Design and Implementation of a Fuze Intermediate Frequency Echo Simulator System
Authors: Guo Yao , He Shuhuan , Yu Wenheng , Pan Xi
Published: December 2024

The fuse echo simulator plays a crucial role in fuse testing. This paper introduces a combined hardware and software solution for a fuze intermediate frequency (IF) echo simulation system. The system utilizes Direct Digital Synthesis (DDS) technology to generate controllable IF echo signals. By pre-storing classic target and environmental characteristic information data, the system is capable of incorporating diverse target and environmental parameters during the simulation of projectile-target encounter process, thereby enhancing the fidelity of the simulated echo signals. Experimental simulations and engineering validations have confirmed that the proposed system can accurately simulate various characteristics of echo signals, while exhibiting low temporal complexity and high real-time performance. These attributes render it effective for evaluating the dynamic performance of Frequency Modulated Continuous Wave (FMCW) fuse systems.
Research on detection performance of millimeter wave fuze under rainfall condition
Authors: Tong Ao , Zhang Yao , Pan Liwen , Pan Xi
Published: December 2024

Aiming at the characteristics that the performance of millimeter wave fuze is easily affected by the natural environment, this paper studies the performance of millimeter wave fuze under rainfall conditions. By analyzing the theory of rain attenuation effect and backscattering effect, it is concluded that the rain attenuation effect reduces the received power of the signal, and the backscattering effect reduces the signal to interference plus noise ratio (SINR) of the receiving end. Based on this, the signal propagation path model under rainfall conditions is established. Finally, the variation of the maximum reliable detection range with signal wavelength and rainfall rate is simulated under different SINR requirements, and the variation of signal to noise ratio (SNR) and SINR with rainfall rate is compared under different distances. The simulation results show that both the rain attenuation effect and the backscattering effect lead to the decrease of the maximum reliable detection distance of millimeter wave fuze. With the increase of rainfall rate, the detection performance of millimeter wave fuze decreases, and the detection distance decreases by about 23.2 % under extreme conditions. The rain backscattering effect on millimeter wave fuze is higher than its attenuation effect, and the influence of rain backscattering effect on millimeter wave fuze increases with the increase of detection distance. When the detection distance increases from 15 m to 30 m, the difference between SNR and SINR at the receiving end of millimeter wave fuze increases by about 3 times. This study has important reference significance for the application of millimeter wave fuze in precision guided weapons.
Analysis of the Response Characteristics of Ultra-Wideband Radio Fuze to Interference Signals
Authors: Hao Shijun , Xie Jialiang , Liang Yanbin , Wu Kaiwei , Yang Bing
Published: December 2024

The response characteristics of the fuze to the interference signal with reasonable characteristic parameters are similar to the real echo signal, which may lead to the confusion of signal processing and recognition system. To solve this problem, this paper analyzes the influence of characteristic parameters of interference signal on the response characteristics of fuze in detail from two perspectives of time domain and frequency domain, Based on the analysis of receiver principle, the amplitude-frequency response model of sampling integral differential circuit is established, and the response characteristics of interference signal are analyzed from the perspective of frequency domain. Based on the analysis of the time-frequency characteristics of the echo signal of the UWB fuze, a time-frequency function cutting method is proposed to evaluate the anti-jamming performance of the UWB fuze. This methodology was applied to the evaluation of the anti-jamming performance of the UWB fuze to sinusoidal amplitude-modulation interference signal and the results show that the theoretical analysis and simulation results are consistent, and the research provides theoretical guidance for the anti-interference of fuze.
Dynamic Analysis of Four-wing Butterfly Chaotic System
Authors: Nie Min , Wang Kangjian , Liu Yongzhi , Fan Bingjie , Li Tianxing , Zhu Peirong
Published: December 2024

To further explore the dynamic behavior in high-dimensional chaotic systems, the complex four-wing butterfly folding phenomenon was discovered based on the Qi system. The results indicate that η will make the Qi system evolve from four vortex structure to a complex wing butterfly folding case. The complex four-wing butterfly folding system were analyzed using tools such as the phase trajectory, time-domain waveform, equilibrium point, bifurcation diagram, and maximum Lyapunov exponent spectrum. Finally, the synchronization control of the system was studied using adaptive control based on stability theory. The stability of the controller was proved using Lyapunov analysis. The results showed that the controller could achieve synchronization of the system in about 3 steps. The discovery of the phase structure will provide more means for the encryption application of Qi system.
A Study of the Ammunition Base of Missile and Gun Combined Weapons
Authors: Tianfeng Fan , Yinhe Li
Published: December 2024

In the process of fighting against the enemy, the ammunition base was an important concept, which had an important effect on the combat mission, and even changed the battlefield situation, however, the early ammunition base was generally estimated by a coarse method based some data, it was lacked of the system research. As to this condition, this paper analysed the influence factors of the ammunition base, and proposed the prediction model of the ammunition base by using the ISM method and the DEMATEL method, and the prediction model of the ammunition base was established, then applied this method in ammunition base of missile and gun combined weapons, the result shows that the ammunition base of missile and gun combined weapons can satisfy the typical combat demand of the weapon.
Application of the damping bag on supersonic rocket sled tests
Authors: Fu Liang , Zeng Yi , Yang Yang , Han Guangbin
Published: December 2024

In recent years, ground-based ultra-high-speed systems such as high-speed rocket sled and super-high-speed railways have become a research hotspot, especially the rocket sled which can currently exceed March 8 in top speed. However, due to the non-perfect smoothness of the slide and the complex aerodynamic environment, the rocket sled has a serious impact on the test articles or test instruments on the rocket sled. Therefore, it is necessary to use vibration isolation facilities to reduce the vibration on the rocket sled. In this work, a vibration damper based on the 4 damping bags with high efficiency damping effect for high-frequency vibration is design. The FEM simulation, vibration table experiments and a supersonic rocket sled test are design to demonstrate the attenuation effect of the vibration damper. All results show the vibration damper can isolate elastic waves in the frequency range from 400 Hz to 2000 Hz.
Research on Digital UAV Test Methods
Authors: Xin Wei , Yan Wang , Yifu Zhuang
Published: December 2024

With the rapid advancement of artificial intelligence technology, the role of unmanned aerial vehicles testing and identification in the process of unmanned aerial vehicles development has become increasingly crucial. This article studies the digital definition of unmanned aerial vehicles testing and identification, the reasons for digital transformation, the connotation of digital transformation, and the capabilities within digital transformation, forming a relatively complete methodology for digital transformation in the field of unmanned aerial vehicles testing and identification, This provides a theoretical reference for the direction of digital transformation in unmanned aerial vehicles testing and identification.
Research on Digital Prototype Model Design of Missile Electrical System
Authors: Hang Xu , Hao Sun , Tianyao Zhang , Yi Lu , Huijie Duan , Nian Zhao
Published: December 2024

The design of missile electrical systems involves various aspects such as electrical network, wiring harness connection relationships, wiring harness layout, and electromagnetic compatibility design. Traditional design methods cannot meet the design requirements of missile electrical systems due to many drawbacks. In this paper, a method to design digital prototype model is proposed. The digital prototype model consists of two parts: the design of cable electrical model is based on Capital and the design of cable structure model is based on NX. And the Digital Prototype model is archived by linking these two parts, which provides a guidance for cable manufacturing and production and laying a good foundation for future research.
Research on the recoil reduction efficiency of a recoilless launch gun with high projectile velocity
Authors: Liu Pengzhan , Jin Wei , Shi Zhiyu , Wang Yong , Zhao Xiongfei
Published: December 2024

Recoilless launch can improve the adaptability of unmanned platforms to weapons by eliminating recoil, but it has the disadvantage of reducing the initial velocity of the projectile. The initial velocity of the recoilless gun can be improved by increasing the charge mass, so research into the recoilless efficiency of recoilless firing with increasing charge mass is of great importance for future applications of recoilless weapons. Based on the combustible cartridge and induction ignition, the one-dimensional homogeneous flow internal ballistic of a recoilless gun with high initial velocity is established. The effect of the Laval nozzle diameter on the efficiency of the recoilless gun is then investigated. The results show that, compared to conventional guns, the recoil can be reduced to 1N-s without reducing the initial velocity of the projectile. A ballistic test on a slide-rail mount is carried out to verify the results of the analysis. The results should make an important contribution to the development of a recoilless rifle.
Investigation on the performance parameters of a blasting rarefaction wave low recoil gun
Authors: Jian Wang , Ziyi Luo , Cheng Cheng
Published: December 2024

The protection performance is needed higher and higher in the development of a modern war. However, with the increase of the projectile kinetic energy, the recoil will increase as well, which brings disadvantages in the gun weapon systems. In this paper, a new recoil gun with a blasting device based on the rarefaction wave is developed to meet the demand of reducing the recoil without loss of the kinetic energy. The physic process of the rarefaction wave gun is studied by a two-phase flow model of interior ballistics. Then the effects of nozzle structure parameters of the low recoil gun are investigated. Based on the study of parameters, an optimized nozzle structure is given. The muzzle velocity reduces only 0.61% and the recoil impulse reduces by 38.5%. The study provides a theoretical direction for the development of low recoil gun weapon.
Application and Research Progress of Reconfigurable Modular Turret for Artillery: A Review
Authors: Meng Fanzhe , Tian Yafeng , Wang Huating , Chen Chen , He Fan , Kou Yu , Zhang Yao
Published: December 2024

Artillery has become a vital component of modern military arsenals due to its high operational cost-effectiveness. The modularized turret is of great significance for artillery, as it improves the applicability of combat scenarios and the efficiency of logistic maintenance, while reducing the overall cost of maintenance throughout the weapon’s lifespan. This paper begins by defining a re-configurable modular turret and then proceeds to present the latest developments in turret modularization around the globe, with a particular focus on their current applications in the field of artillery. Secondly, the research trend of the reconfigurable modular turret is reviewed in terms of the ammunition supply system, the overall structural design, and the optimization of artillery. Finally, the key technologies of modular turrets are discussed in order to provide a reference for the development of reconfigurable modular turrets.
Simulation Research on the Control of Firing Stability of a New Generation Large-caliber Gun with Liquid-gas Composite Standing Hoes
Authors: Liu Huan , Huang Qiao Gao , An Cai Yun , Liu Peng Ke , Qi Xiao Bin , Zhang Shao Bin , He Qi
Published: December 2024

Both wheeled and tracked guns will show different forms of body vibration when firing, which seriously affects shooting accuracy. Therefore, in order to reduce the vibration as far as possible, a new generation large-caliber gun is equipped with a liquid-gas composite standing hoes, by adjusting some parameters, the vibration of the gun body can be reduced to a great extent, so as to improve the shooting accuracy. The dynamics simulation model of vehicle-gun with liquid-gas buffer standing hoes was established. Taking the inner diameter of the accumulator damping hole as the optimization objective, three inner diameters were selected for comparative study. the influence of the damping hole diameter on the firing stability and the ground support force of the standing hoes under the firing state of azimuth 0°、 altitude 0° and azimuth 30°、altitude 30° were investigated. The results show that the inner diameter of the accumulator damping hole is proportional to the maximum pitch angle of the vehicle body and inversely proportional to the support force of the standing hoes under different firing states. In order to comprehensively consider shooting stability and the force of the standing hoes, the inner diameter of the accumulator damping hole is 5mm as the optimal choice.