bluuebunny/crossref_metadata_2025 huggingface dataset:
Trajectory Tracking Control for USVs Based on Red-billed Blue Magpie Optimized ADRC
Authors: Luo Zhang Zi , Chongwei Han , Kai Shen , Qikai Hao , Jiayue Jiang , Ziyi Zhang
Published: December 2024

Aiming at the characteristics of the underdriven surface unmanned ship trajectory tracking problem such as strong coupling, nonlinearity, under-driving and strong disturbance, the mathematical model of the system is established by considering the problem of parameter uncertainty. Combining the Red-billed Blue Magpie Optimizer (RBMO) and the Line-of-Sight (LOS) guidance law and the Active Disturbance Rejection Control, the problem of mutual coupling between the states of the system is solved, and the decoupled two-channel Active Disturbance Rejection Control is formed. The optimization algorithm of the red-billed blue magpie is used to optimize nine parameters of the dual-channel Active Disturbance Rejection Control, which solves the problem of the numerous parameters of the Active Disturbance Rejection Control and the difficulty of parameter tuning. The simulation results show that the control method can enable the system to track the circular trajectory related to the time parameter under the condition of parameter ingestion and subject to external perturbation, with high tracking accuracy and anti-perturbation ability, which provides a new technical way for the research of trajectory tracking control of underdriven surface unmanned vessels.
Analysis on Fluid-Solid Coupled Heat Transfer of the High Speed Rocket Sled Slipper
Authors: Yang Yang , Zhang Chenhui , Liu Jin , Zhang Chuanxia , He Xiangfeng
Published: December 2024

In order to determine the heat transfer situation in the gap between the slipper and the rail in high speed rocket sled test, based on heat transfer theory and the calculation results of the steady-state flow field in the narrow gap between the slipper and the rail, coupled calculations were conducted on the flow field around the slipper and the slipper structure field. With a heating time of 0.1s, aerodynamic heat transfer results of the slipper structure with different gaps and different Mach numbers were obtained. The results showed that the temperature of the slipper increased with the increase of Mach number, and the thermal environment of the slipper was the most severe when the gap was 5mm and Mach number was 6, the internal temperature of the slipper gap was about 200K higher than the outer surface part, and only the outer layer material of the slipper, which is about 1mm thick, is significantly heated.
Numerical simulation of mechanical and aerodynamic interference characteristics of the separation of sabot and projectile in integrated launch package (ILP) for electromagnetic railgun
Authors: Zeng H Y , Chen K , Zhou F
Published: December 2024

The integrated launch package(ILP) for electromagnetic railgun(EMR) has a very high initial velocity as it launches. The sabot petals automatically disengage from the ILP after launch due to the aerodynamic force of the external flow field. Their stabilization upon separation will directly affect the flight of the core projectile of ILP and the final target striking effect. In the case of ILPs equipped with various types of sabots, the characteristics of the aerodynamic interference including surge and eddy currents, will be different during the separation. In this paper, the numerical simulations to analyze the aerodynamic characteristics of the outflow field of five types of ILPs (A1~A3 and B1~B2) in five typical separation states at zero angle of attack and Mach number 6.5 are carried out by means of the steady state solution of the outflow field in the air domain based on computational fluid dynamics (CFD). According to the results, the aerodynamic interference characteristics between projectile and sabot petals during the separation are analyzed and compared. Based on the numerical simulations, we conclude that the A1 sabot petals design exhibits favorable aerodynamic characteristics, potentially enhancing the separation process and improving the end-strike performance of the ILP.
Research on aerodynamic optimization of hypersonic missiles
Authors: Tianyang Zhang , Jiahao Zhang , Qingbo Yu
Published: December 2024

To investigate the impact of different components on the aerodynamic characteristics of hypersonic missiles and missiles’optimization, a numerical simulation model of the typical hypersonic missile aerodynamic optimization was developed based on Ansys/Fluent. Based on this foundation, the missile was three-dimensionally modeled using Solidworks software. Detailed aerodynamic performance analysis was conducted on its head, tail, and canard configuration, which included key aerodynamic performance indicators such as drag coefficient and lift-drag ratio. The research findings indicate that the aerodynamic performance of the missile head design significantly affects the missile structure under investigation. Appropriate increase in the number of tail fins can effectively enhance the overall aerodynamic performance of the missile, however, if the number exceeds a certain limit, it may exert a detrimental impact on performance. In addition, at high attack angles, the use of canard configuration can significantly increase the missile’s lift coefficient and stability.
Research on Guidance and Control Method of UAV for Ground Attack Missions
Authors: Zhao Juncheng , Gong Zheng , Yang Yi , Chen Yongliang , Bai Yalei
Published: December 2024

On the modern battlefield, suicide drones have a low ability to break through the air defense fire network when using traditional ballistics against ground targets. The adoption of ballistic trajectory with landing constraints can effectively improve the survivability of missiles and the attacking effect on ground targets. Starting from the pure proportional navigation, the relationship between the ballistic angular rate and the target line-of-sight angular rate of the traditional proportional guidance is expanded to the relationship between the missile’s overload and the target’s line-of-sight angle, so as to realize the effect of controlling the missile’s overload to indirectly control the ballistic angle to the target’s line-of-sight angle of convergence, which ensures the fast tracking of the target and at the same time, makes the missile attack the target’s trajectory more gently. Attacking the target with the overload control method guarantees that the overload of the missile during the guidance process is within a reasonable range, which effectively reduces the probability of missing the target. By selecting appropriate proportional navigation coefficients and incorporating bias terms with controlled descent angles, a three-dimensional guidance and control method is designed to achieve precise targeting with longitudinal descent angle constraints on fixed ground targets. This guidance and control method remains effective even under hypersonic conditions, as verified through hardware-in-the-loop simulation, confirming its effectiveness and precision.
Aircraft attitude signal noise reduction based on improved wavelet
Authors: Lei Yang , Tianyang Zong
Published: December 2024

Based on the conventional soft threshold function and hard threshold function, an improved wavelet method for aircraft signal noise reduction is proposed. The results show that copared with the traditional soft threshold function and hard threshold function, the mean relative error of SNR after noise reduction is increased by 8.93%, and the mean relative error of MSE is decreased by 16.13%. The improved threshold function has obvious advantages in the preprocessing of attitude measurement, and can better retain signal characteristics.
A systematic modeling and effectiveness evaluation framework for heterogeneous missile swarm systems
Authors: Li Xuan , Shi Renhe , Jiao Yingjie , Gao Nannan
Published: December 2024

Heterogeneous missile swarm employs different kinds of missiles to work cooperatively for systematic warfare, which attract much attention in recent years. In order to effectively calculate and evaluate the systematic fighting capacity of heterogenous missile swarm in different scenarios, a systematic modeling and effectiveness evaluation framework is proposed in this paper. Firstly, the combat loop is defined, where the task assignment between missiles and targets is carried out using the contract net auction algorithm. Then the systematic model of heterogeneous missile swarm is constructed in terms of Observation-Orientation-Decision Action(OODA) loop network. Finally, the uncertain self-information method is used to calculate the system’s effectiveness. It can be seen from the results of the engineering example that the framework fully considers the whole process of the combat system, which can comprehensively and effectively evaluate the system effectiveness of the heterogeneous missile swarm system.
The Impact of Magnet Structures on Target Magnetic Anomaly Detection
Authors: Tianhan Yang , Shizhong Li
Published: December 2024

To address the limitation of short detection ranges in conventional magnetic sensors, excitation magnetic fields can be used to enhance the target’s magnetic anomaly and thereby extend the detection range. By arranging permanent magnets to create excitation magnetic fields around the magnetic sensor, targets are magnetized, producing significant magnetic anomalies that can be detected by the sensor. Four different magnet configurations were tested in simulations to compare the response characteristics of the magnetic sensor using a typical iron rod as the target. Based on these simulations, a magnetic detection device was designed and experimentally validated. The results demonstrate that excitation magnetic fields effectively increase the magnetic anomaly and detection range compared to conditions without permanent magnets. When two permanent magnets are placed vertically with the magnetic sensor’s measurement point at the center, the excitation field has the most pronounced effect on the iron rod’s magnetization, resulting in the largest magnetic anomaly and improving signal acquisition. This study offers a novel approach to enhancing the detection capabilities of magnetic sensors.
Anti-jamming Method of FM Fuze Based on Deep Learning
Authors: Zhang Jin-yu , Yan Xiao-peng , Hao Xin-hong , Zhang Jin-cheng
Published: December 2024

In response to the challenges posed by sweeping jamming and Digital Radio Frequency Memory (DRFM) jamming in Frequency Modulation Continuous Wave (FMCW) fuzes, a jamming mitigation method based on deep learning method is proposed in this paper. Initially, the target beat frequency signal data affected by sweeping jamming and DRFM jamming is gathered and analysed using the Transformer method. A comparison is made between the classification and recognition outcomes of Transformer model and Support Vector Machine (SVM) methods to identify the optimal model. Subsequently, the feature information of the echo signal under interference is extracted using Empirical Mode Decomposition (EMD) decomposition, and the target features are reconstructed. Experimental results utilizing simulated data confirm that the proposed method achieves a classification accuracy of 92% and ensures that the fuze detonation distance remains within the pre-set 9 m range.
Evaluation Method for Anti-Chaff Jamming Performance of Typical Radio Fuze
Authors: Xiangli Wenting , Su Hong , Li Tie , Hou Yali , Cui Dong
Published: December 2024

Chaff jamming is one of the common countermeasures in electronic warfare against radio fuze. Currently, there is no unified and effective evaluation criterion and method for the anti-chaff jamming capability of radio fuze. An evaluation method for the anti-chaff jamming performance of radio fuze during the missile-target encounter trajectory phase is proposed. A dynamic echo model of chaff clouds was established. The echo signals of the chaff cloud and the target were calculated and the fuze actuation were simulated and analyzed. The results show that this evaluation method can effectively assess the anti-chaff jamming performance of typical radio fuze.
Study on the influence of the initial position of the projectile on the internal ballistic performance in the engraving process
Authors: Wu Y H , Dai J S , Lin S Y , Gao Y F , Cui K K
Published: December 2024

Due to positioning errors and forcing cone wear, the projectile’s initial position in the chamber will change. The initial position of the projectile will influence the initial conditions of the band engraving in the rifling, which in turn affects the dynamic impact characteristics of the rotating band in the engraving process. In the present work, a small-caliber naval gun was taken as the research object, the internal ballistic procedure was used to calculate the combustion process in the chamber, and the engraving resistance and the internal ballistic performance were comparatively analyzed. The result shows that the farther initial distance leads to a smaller chamber pressure and projectile velocity. Compared to the case where the rotating band is attached to the forcing cone, increasing the distance between the band and the forcing cone by 1mm, 2mm, and 3mm respectively reduces the maximum chamber pressure by 8.3%, 13.3%, and 15.0%; correspondingly, the projectile velocity decreases by 1.6%, 2.6%, and 3.1%, respectively; while the maximum engraving resistance exhibits a relatively small change.
Numerical simulation study on the damage characteristics of ice sheet penetration by shaped charge jet
Authors: Feng Chenghang , Yi Jianya , Wang Zhijun , Yin Jianping
Published: December 2024

The value of polar regions in resources, transportation, geostrategy and other aspects becoming more and more prominent, in order to develop advanced ice-breaking combat weapons and enrich the operational means of our army in carrying out polar missions, this paper establishes a numerical simulation model of the jet penetrate the ice sheet by applying the flow-solid coupling algorithm in the dynamics analysis software LS-DYNA, investigates the damage characteristics of the ice sheet under the impact of the jet and analyzed the results of the penetration of the ice sheet by shaped charge jet formed by two typical liner, to obtain the crack morphology of the ice sheet and the destruction of the law, in the same calibre and charge conditions, the jet formed by eccentric sub hemisphere liner perforation aperture is more suitable for ice-breaking open charge; in order to further study the jet penetration produced by the initial destruction of the ice sheet on the impact of the underwater explosion to break the ice, through the export of the model file restart method simulated by the jet through the ice sheet after the underwater explosion process, the results show that the initial damage formed by the shaped charge jet penetration in the study of underwater explosion ice breaking cannot be ignored, the diameter of the hole in the ice sheet increased by 13.46%, the initial hole will increase the subsequent underwater explosion on the destruction of the ice sheet.
Molecular dynamics simulations on shock response and plasticity behaviors of semi-coherent {001} Ni/Al laminate composite
Authors: Wang Yu , Hao Junhui , Liu Bin , Suo Xinkun , Fang Haijiang
Published: December 2024

Molecular dynamics (MD) simulations were used to explore the shock response and plasticity behaviors of a semi-coherent {001} Ni/Al laminate composite premised on interfaces. Firstly, the impedance-matching theory can reasonably explain the impacts that interfaces have on the propagation of shock waves. The findings illustrate that “reflection-unloading” occurs at the Ni-Al interfaces; however, “reflection-loading” occurs at the Al-Ni interfaces. The interfaces have been observed to have discontinuities of shock wave stress, characterized by elastic-plastic properties of heterogeneous materials adjoining the interfaces. Secondly, the stacking fault pyramids and dislocation activities in the Al layers were derived using shock modeling of a multilayer target. Thirdly, we studied the formation of stacking fault pyramids, a process involving decomposition and synthesis of perfect dislocations, and the process of FCC→BCC→HCP continuous phase transition.
Penetration resistance of spliced of constrained ceramic-metal composite structures
Authors: Wu Hao , Wu Yang , Wu Guodong , Liu Zide
Published: December 2024

Aiming at the problems of edge weakening effect and gap defects in ceramic metal composite structure, the anti-penetration performance of ceramic metal composite structure was studied. Based on the experimental study of ceramic metal composite structure against 7.62 mm armor-piercing incendiary projectile penetration, the numerical model of ceramic metal composite structure against penetration was established. According to the experimental results, the reliability of the numerical simulation method was verified, and the anti-penetration performance at the ceramic joint was analyzed. The results show that the aluminum alloy sandwich plate can provide effective support for the ceramic. With the increase of the thickness of the aluminum alloy sandwich plate, the anti-penetration performance of the composite structure is improved. The anti-penetration performance of the composite structure increases with the increase of the thickness of the UHMWPE backplane. When the backplane reaches a certain thickness threshold, increasing the thickness of the backplane cannot significantly improve the anti-penetration performance of the composite structure. Adding a certain thickness of metal separator at the joint can effectively reduce the damage of ceramics.
Study on precise arrangement of spherical fragments in blast-fragmentation warhead
Authors: Wang Cunhong , Li Guangjia , Xue Jianfeng , Kong Qingqiang , Kong Lin , Fu Wei , Zheng Wenkai , Cao Yuwu , Sun Xingyun
Published: December 2024

The fragmentation arrangement of a blast-fragmentation warhead plays a crucial role in determining its damage performance. While extensive research has been conducted on explosive detonation driving and dynamic performance, there is a lack of reports regarding fragmentation arrangement methods. This study primarily focuses on the precise arrangement of spherical fragments within a warhead, building upon the conventional cylindrical warhead design. We discuss two main types of fragment arrangements: staggered and centripetal. Furthermore, the analysis further into staggered arrangements with single-layer, double-layer, triple-layer, and multi-layer configurations, providing a theoretical calculation formula for determining the thickness of the spherical fragment module. Finally, we explore the impact of charge radius and fragment size on the module thickness, noting a gradual increase in thickness with larger fragment radius and charge radius, before eventually stabilizing. Additionally, it investigates the effects of double-layer and triple-layer spherical fragment arrangements on warhead quality using a Φ350 mm ×1200 mm cylindrical warhead. The findings suggest that staggered arrangement of spherical fragments can enhance charge quality and overall damage performance of the warhead while offering valuable insights for the designing of high-quality blast-fragmentation warheads.
Design of Command Launch Unit Real Time Simulation Software Based on Windows XP+RTX
Authors: Zhang Duo , Chang Yutong , Lyu Fang , Zhang Xiao , Cheng Simin
Published: December 2024

In the hardware-in-the-loop simulation environment of a certain type of tactical missile, the real-time simulation software which is developed based on the Windows XP platform is needed for simulation calculation and simulated launch control. By analyzing the overall architecture of the simulation system and the real-time principle of RTX, as well as studying the characteristics of real-time VMIC and RS422 communication in RTX environment, the real-time communication process of software is designed, and the simulation software of the transmission control unit, based on Windows XP+RTX environment, is developed. This design enables software control of simulated launch of missiles and real-time communication of data. According to the results of hardware-in-the-loop simulation experiments, the simulation software meets the requirements.
Multi-objective optimization of structural parameters for the monorail sled connecting plate
Authors: Xie LinQing , Wang Tao , Ba WeiTao , Fan Kun , Li Kang , Liu Yang
Published: December 2024

Addressing the multi-objective optimization of structural parameters for the monorail sled connecting plate, the static strength and modal characteristics were computed using the finite element method. The optimization objectives were set to minimize the total mass of the structure, reduce maximum equivalent stress, and maximize the first-order modal frequency. A proxy model for the finite element analysis and calculation of connecting plates was constructed based on a BP neural network, and the trained model exhibits strong predictive capabilities. During the optimization process, an improved MOPSO is introduced, merging the external archive maintenance strategy from CDMOPSO with the dynamic mutation strategy from ASMOPSO. The Pareto solution set produced by this refined MOPSO exhibits a lower IGD value. A mathematical model for multi-objective optimization of connecting plate structural parameters was established, and the Pareto solution set was calculated. Compared to the initial structure, the optimized one showed a reduction of 8.41% in overall mass, a decrease of 40.47% in maximum equivalent stress, and an increase of 34.29% in the first-order modal frequency, thereby verifying the optimization algorithm’s feasibility.
Numerical simulation of EFP forming and penetration characteristics for shaped charge with a small aspect ratio
Authors: Chen Min , Guo Huanguo , Li Peipei , Chen Tinghao , Sun Xu
Published: December 2024

In this paper, the effects of main charge aspect ratio, liner curvature radius, liner wall thickness, and other factors on the forming characteristics of the explosively formed projectile(EFP) were studied based on the AUTODYN simulation platform. The influence laws of various factors on the forming characteristics of EFP were obtained, and the structure of the shaped charge with a small aspect ratio was optimized. Numerical simulations showed that, in the data range studied in this paper, to obtain the ideal penetration effect, the aspect ratio of the main charge should be selected from 0.65 to 0.8, the wall thickness of the liner should be generally selected from 0.02 to 0.05 times of charge diameter (CD), and the liner curvature radius should be 90 mm to 110 mm. At the same time, the influence law of each factor on armor steel penetration is obtained, which provides a theoretical basis for selecting suitably shaped charge structures under different damage requirements.
Modelling and analysis of nonlinear dynamics of rigid-flexible coupled structures
Authors: Zhao Bingxin , Gu Xudong
Published: December 2024

In the rigid-flexible coupled structure, the coupling between the elastic deformation motion of the flexible structure and the wide range of the rigid body motion will make the dynamic behaviour of the structure more complicated. This paper established a class of rigid body structures with flexible attachments as a rigid body-cantilever beam coupling model. The nonlinear dynamic equations of the structure are established by taking the dynamic stiffening into consideration. The dynamic responses of the structures are obtained by numerical simulations. The results show that the transverse vibration frequency of the flexible beam increases with the increase of the angular velocity of the rigid body. Moreover, there will be a significant difference between the two results obtained by the linear dynamics model (LM) and the nonlinear dynamics model (NM) in certain situations due to the effect of the dynamic stiffness term.
Research on dynamic penetration of shaped charge jet under the condition of projectile and target rendezvous
Authors: Wang Yizhen , Yin Jianping , Xu Can , Zhang Xuepeng , Yi Jianya
Published: December 2024

To explore the penetration behavior of jets under dynamic impact conditions and to predict and assess the dynamic penetration power of shaped charge jets, finite element methods were employed to numerically simulate shaped charge warheads under various impact conditions. Combined with theoretical analysis, the simulations analyzed the variations in perforation and dynamic penetration depth of the jet into target plates. Using a random forest algorithm, the influence weights of different factors on the dynamic penetration depth of the jet were obtained. Furthermore, an engineering model for predicting the dynamic penetration depth of shaped charge jets was established through a linear regression model. The research results indicate that the impact velocity is the most critical factor affecting the dynamic penetration depth of shaped charge jets. The dynamic penetration depth of the jet into targets within a certain range of impact velocities is approximately linear. The established engineering model can effectively predict the penetration power of jets under dynamic impact conditions.
Tension Performance Prediction and Experiment of Optical Smart Composites Using Micromechanical Failure Theory
Authors: Zhang Yunqian , Luo Lilong , Zhang Guofan , Chang Liang , Nie Xiaohua
Published: December 2024

Embedding fiber optic sensors in composites can long-term instantly monitor the deformation and damage within the composite structure, which realizes structural health monitoring and life prediction. However, fiber embedding generally brings damage in terms of the composite material integrity and continuity, resulting the extreme stress concentration in the interface of the optical fiber and composite. Therefore, the mechanical properties of the composite material are potentially influenced unfavorably. To investigate the influence of microstructures such as optical fibers on the macroscopic tensile mechanical properties of composites, this paper develops a progressive damage analysis model inspired by the micromechanical failure theory. The established model can predict the stiffness and strength properties of fiber smart composites. The model is further verified by comparing the obtained tensile failure mechanism with the experimental results. The results show that the maximum relative error of the destructive load is only 3%, which demonstrates the accuracy and validity of the model. The work of this paper can provide guides for the optimization and strength prediction of smart composite structures with embedded optical fibers.
Precipitation Behavior of Secondary γ′ Phase of Nickel-based Superalloy during Gradient Cooling Process
Authors: Fu Pei , Liu Wei , Zhou Ping , Xie Ziwei
Published: December 2024

Nickel-based superalloy is an indispensable strategic material in aerospace, national defense, and other fields. Heat treatment is an important process for preparing nickel-based superalloys because of its great influence on the microstructure and mechanical properties. In this paper, the end-quench test and numerical simulation were applied to study the relationship between the cooling rate and precipitation behavior of the secondary γ′ phase of the nickel-based superalloy efficiently. The in situ end-quench test system was established to reduce temperature error caused by heat loss during specimen movement, providing an accurate initial temperature distribution for quenching. Besides, the process including the induction heating and the gradient cooling was simulated to obtain the cooling rate at any position of the specimen. The results show that in the cooling rate range of 51~1574 K /min, when the cooling rate decreases, the morphology of the secondary γ′ phase changes from spherical to nearly square or irregular polygon, and the size increases from 27.8nm to 161.4nm. Furthermore, a double logarithmic correlation was found between the average cooling rate and the size of the secondary γ′ phase, which had great meaning in designing and optimizing the heat treatment process of the nickel-based superalloy.
Tracking and control of UAV-borne gun under complex operating conditions: A constraint-following approach
Authors: Ma Yuze , Guo Xiaoyuan , Wu Jing , Ma Jie , Liu Feifei , Si Zhihui , Li Xiaojiao
Published: December 2024

A control problem for UAV-borne gun stability based on constraint-following approach was addressed in this paper. The objective was to design a control to drive the gun stability control system to follow a stability constraint approximately: with the consideration of (possibly) time-varying uncertainty, the gun adjusts from the off-target position to the target direction and tracks steadily as the target moves. In this paper, multibody dynamics and control system co-simulation method was used to verify the stability of the controller. Compared with other linear controllers, the constraint-following controller adjusts the gun to the target position faster and follows the enemy vehicle target more stably.
Research on the compressive mechanical behavior and constitutive model modification of novel refractory high-entropy alloy (Ti2Zr)1.5NbVAl0.25
Authors: Zheng H L , Wang Z X , Li Z K , Xu L Z , Wang J B , Du Z H
Published: December 2024

In recent years, high-entropy alloys have been widely applied across various fields. To explore the mechanical properties of high-entropy alloys and their characteristics under extreme environments, ingots of a quinary high-entropy alloy (Ti2Zr)1.5NbVAl0.25 were prepared. The material’s compression mechanical properties were studied under quasi-static conditions at room temperature with strain rates ranging from 0.001s−1 to 0.1s−1, dynamic compression at strain rates ranging from 1300s−1 to 3100s−1, and compression at a strain rate of 1900s−1 and temperatures from -80°C to 400°C. Impact specimens subjected to strain rates of 1300s−1 and 3100s−1 at room temperature were recovered for metallographic analysis. The results indicate that (Ti2Zr)1.5NbVAl0.25 exhibits significant strain-hardening behavior and strain rate sensitivity. Under medium to high strain rates, the alloy undergoes a phase transformation from a single-phase BCC structure to a mixture of BCC and B2 phases upon impact, with 2500s−1 being the threshold strain rate for phase transformation. The original parameters of the Johnson-Cook constitutive model were fitted based on experimental data, and modifications were made to the strain rate hardening and temperature terms in the original model. The modified Johnson-Cook constitutive model demonstrates improved prediction of the mechanical properties of (Ti2Zr)1.5NbVAl0.25 high-entropy alloy at both room temperature and under extreme environments.
Anti-migration of DOS by Using HTPB/GO liner and GO film
Authors: Lu Zhehong , Li Jingyi , Wang Yanlong , Zhu Ziqiang , Jiang Wei , Huang Rong , Hu Yubing
Published: December 2024

The enhancement of anti-migration performance in insulation materials is critical for the stability and reliability of solid rocket motors (SRMs). This study explores two innovative methods to improve the barrier properties of Ethylene Propylene Diene Monomer (EPDM) insulation layers. Firstly, a composite liner combining Hydroxyl-Terminated Polybutadiene (HTPB) and Graphene Oxide (GO) was synthesized through a solution blending method. Additionally, a GO film was fabricated and integrated with the HTPB liner and EPDM to create a multilayer sandwich structure. The incorporation of these materials was found to significantly enhance the anti-migration performance, with the composite samples showing a 16.89% improvement over standard samples. The layered structure of GO effectively impedes the migration of dioctyl sebacate (DOS), enhancing the anti-plasticizer migration properties of the EPDM. While the multilayer sandwich samples also demonstrated improved performance, issues with adhesion between the GO film and EPDM lead to reduce its effectiveness. Future research will focus on improving the adhesion between the GO film and EPDM to further enhance anti-migration performance. This study provides valuable insights for developing high-performance EPDM insulation materials with enhanced anti-migration properties for aerospace applications.
STM32-based firearm system storage environment monitoring and control system
Authors: Ji Mengke , Yin Jianping , Wang Zhijun , Yi Jianya , Li Xudong
Published: December 2024

In order to realize real-time monitoring of the storage environment of the firearm system, adjust the storage environment of the firearm system, and turn on the safeguard measures in a timely manner, so that the missile weapon system is always in a suitable storage environment and its storage life is maximized. In this paper, a weapon environmental monitoring and control system based on STM32 microcontroller is designed. The system takes the STM32F103ZET6 microprocessor as the core, uses sensors such as temperature and humidity, light, smoke and gas concentration to collect environmental information, and then transmits the data to the OLED screen for display, and at the same time completes the communication between the device and the cloud platform through the Wi-Fi module. The system will automatically alarm through the buzzer and screen prompts, and the App mobile phone will also send out corresponding prompts. The test results show that the system can effectively realize real-time remote monitoring and control of the storage environment, and the system has low power consumption, simple operation and good compatibility, and has certain application value.
Orthogonal optimization analysis on the jet penetration behaviour of biconical reactive liner
Authors: Liu Yize , Su Chenghai , Wang Haifu
Published: December 2024

In order to improve the penetration depth and hole diameter of concrete target penetrated by reactive jet, a biconical reactive shaped charge was designed in this paper. Based on ANSYS-LSDYNA numerical simulation platform, orthogonal optimization design method was used to optimize the structure of biconical reactive shaped charge. The influences of the upper cone angle, lower cone angle, upper liner ratio of liner, liner thickness and charge length-diameter ratio on jet formation and penetration were obtained. On this basis, the three performance indicators of penetration depth, cross-sectional area of hole and damage area were analysed and discussed, and a set of optimal structural parameters were obtained. Numerical simulation results showed that the optimal biconical reactive shaped charge could cause penetration depth of 1075.88mm (5.97CD), the cross-sectional area of 0.070172m2, and damage area of 0.084427m2 to the semi-infinite thick concrete target at 3CD standoff. Compared with control variable method, the improvements of three performance indicators can reach 29.83%, 32.26% and 127.00% respectively.
Precise calculation for underwater internal ballistics based on bi-directional coupling
Authors: Sun Zhiqun , Li Qiang , Qu Pu , Lu Lin
Published: December 2024

An accurate calculation method for underwater internal ballistics considering motion resistance is proposed based on bi-directional coupling. The resistance of the projectile against water is often neglected in underwater classical internal ballistic modelling, leading to less precise calculations. In this paper, the mutual influence of the projectile motion and the water current is considered comprehensively by establishing a bi-directional coupling model of the fluid and the projectile. The launching process of the underwater projectile is simulated in detail using a combination of computational fluid dynamics (CFD) and classical internal ballistics (CIB). The numerical simulation results show that the bi-directional coupling model has high accuracy in predicting the trajectory, initial velocity and pressure distribution. Compared with the traditional bi-directional coupling model, the bi-directional coupling model can reflect the actual situation more accurately, which significantly improves the reliability and accuracy of underwater ballistics research. The research results of this paper provide new theoretical support for underwater ballistic design and are of great significance for improving the performance of underwater weapon systems.
Life test and inner bore damage analysis of high chamber pressure gun barrel
Authors: Geng Xuehao , Li Haoyang , Liu Feifei , Gao Tan , Yang Ruiqiang , Zhao Zhiyi , Yu Bing
Published: December 2024

This paper is devoted to research the inner bore damage laws of high chamber pressure tank gun barrel, A larger caliber tank gun barrel is chosen as study object and a full life test is conducted for this barrel, three life-related parameters(muzzle velocity, chamber pressure and inner bore size) are measured during the test. The life of this gun barrel is judged to end according to the high chamber pressure gun barrel life criteria after 658 fired rounds. Life-related parameters variation analysis and initial erosion condition inspection of this test gun barrel are conducted after the test, and several high chamber pressure gun barrel damage laws are obtained. The damage laws have guiding significance for damage mechanism research and life enhancement technology study of high chamber pressure gun barrel.
Research on the penetration-deflagration coupled characteristics of encased reactive fragments
Authors: Zhang Jiahao , Zhang Tianyang , Liu Chengzhe
Published: December 2024

To investigate the penetration-deflagration coupled characteristics of encased reactive fragments, a numerical simulation model of the encased reactive fragments penetration plate was developed based on Ansys/Lsdyna. Firstly, the mechanical response of the encased reactive fragments penetration plate was obtained using the Johnson-Cook material model, which yielded the internal pressure distribution of the reactive material. Subsequently, the JWL model was used to simulate the penetration-deflagration process, where the JWL parameters of the reactive material were determined based on the condensed reaction material detonation theory. The results indicate that a larger plate thickness value leads to a decrease in the overall internal pressure of the reactive material, thereby reducing the reaction rate of the reactive material. The plate thickness has a marginal impact on the reaction of the encased reactive fragments, but it significantly influenced the deformation and break of the shell, this paper gives the optimal shell and plate thickness under the impact conditions. coefficient and stability.
Application of Target Enhancement Method Based on Image Super-resolution in the Field of Explosion and Shock
Authors: Zhang X , Wang C L , Qian B W , Ke M , Wu Z H , Meng Z , Zhang B T
Published: December 2024

In the explosion and impact scenes, there are a large number of images with poor imaging quality due to the insufficient resolution of high-speed camera hardware, and in order to accurately analyze the impact of the damage element and the power of the projectile, it is necessary to greatly improve the image quality from the technical level, and the image super-resolution algorithm can play a role in this field. Through the research and analysis of the mechanism and application effect of a variety of different super-resolution algorithms, the enhanced super-resolution adversarial generation network with good effect in the field of explosion and impact is selected, which has a good effect on image features and edge contour recognition of objects. In this paper, the algorithm is applied to the scenarios of encounter between the projectile and the target, fragmentation field, shock wave field, thermal effect analysis, etc., and the super-resolution enhanced damage scene map is quickly obtained, which provides reliable data support for the accurate analysis of the damage element.
Numerical simulation of shaped charge jet forming and penetrating characteristics of anti-armor and anti-personnel composite warhead
Authors: Wang C X , Ren X T , Zhang Y
Published: December 2024

The anti-armor and anti-personnel composite warhead is a kind of high-efficiency warhead with both anti-armor and anti-personnel effect, which is suitable for weapons such as cruise missile and UAV-brone ammunition. Based on the ANSYS/LS-DYNA numerical simulation software, the influence of the structural parameters of the biconical warhead on the forming characteristics and anti-armor power of the shaped charge jet was studied. The results show that the main mechanism of fragment influence on jet forming characteristics is to reduce the driving pressure of detonation by reducing the charge mass. Prefabricated fragments have little delay effect on radial rarefaction wave propagation in detonation products, and the existence of fragments increases the penetration depth by 1.41% under the same charge mass. The research results provide a useful reference for the overall structure design, material selection and structure optimization of the anti-armor and anti-personnel composite warhead.
Research on the Correlation between the Barrel Temperature and the Parameters of Interior Ballistic and Charge
Authors: Zhu Wenfang , Feng Yuan , Wang Yuwei , Qu Yingzhi
Published: December 2024

Aiming at the problem that the barrel life of a large calibre artillery is obviously lower than the international advanced level, and the thermal erosion inside the barrel is serious, based on modern interior ballistic theory and heat transfer theory, a simulation of one-dimensional two-phase flow interior ballistic, heat exchange process between gas-solid two-phase flow and the barrel is carried out. The influence of maximum pressure in bore, charge, propellant explosion temperature, barrel structure and other parameters on the barrel temperature is obtained, and the correlation between the barrel temperature and parameters of interior ballistic and charge is analyzed, providing direction for the design of low-ablation interior ballistic and charge.
Gas-Liquid Separation of Liquid Hydrogen in Microgravity: Optimization of Structural Parameters, Angles, Rotational Speeds, and Gas-Liquid Ratios
Authors: Li Zehao , Xu Wenlong , Zhu Honglai , Gao Yaru , Chen Chongwu , Zhao Haitao
Published: December 2024

Liquid hydrogen (LH2) is a high-efficiency cryogenic propellant extensively used in the aerospace industry due to its superior specific impulse and energy density. Despite its advantages, managing LH2 in orbit presents significant challenges, particularly in microgravity, where fluid transport and gas-liquid interface stability are adversely affected. This study addresses these challenges by investigating the effects of different structural parameters, angles, rotational speeds, and gas-liquid ratios on LH2 gas-liquid separation through comprehensive numerical simulations validations. We analyze the impacts of various pore diameters and axial spacings, as well as the evolution of gas-liquid configurations at different angles and rotational speeds. Additionally, we explore the effects of different gas-liquid ratios on separation performance. Our findings identify optimal parameter combinations and elucidate key mechanisms influencing gas-liquid separation efficiency. The study employs high-precision models and microgravity simulation experiments to validate the numerical results, providing a robust foundation for optimizing LH2 management devices. This research contributes valuable insights into the management of liquid hydrogen (LH2) in microgravity environments and provides foundational knowledge that may benefit future deep-space exploration missions.
Study on the leakage mechanism of sealing with hyperelastic rough surfaces based on iterative algorithm
Authors: Jiang C Y , Lin X X , Li X , Sun S J , Wang L J , Yang B
Published: December 2024

The sealing structures, found in various equipment used in daily life, industry, and the military, play roles in preventing leaks, contamination, and toxic gases. This study focuses on the sealing interface of hyperelastic rough surface, employing an iterative algorithm to calculate the leakage process under fluid action and determine the critical leakage pressure. By substituting the fluid load on the sealing interface before leakage with a uniformly distributed pressure, this algorithm accurately identifies the boundaries of fluid and sealing contact regions through continuous iteration. Consequently, it solves the sealing interface state under a certain pressure and incrementally increases the hydrostatic pressure to obtain the critical leakage pressure. This research visualizes the sealing leakage process and determines the critical leakage pressure of the sealing interface, offering practical value for engineering applications and providing guidance for the design and manufacturing methods of sealing components.
Bidirectional dual closed-loop trajectory tracking control based on chassis model identification
Authors: Dai Changhua , Wang Dingheng , Yang Wei , Zhang Yue , Duan Yuanchao , Lu Yongchao , Zhao Kai
Published: December 2024

The field of trajectory tracking control for ground vehicles has problems such as unknown control object manipulation characteristics, missing dynamic digital models, and susceptibility to distortion of upper-layer tracking control algorithms. This paper first proposes a method for identifying the chassis forward/inverse dynamics model based on vehicle-level state variables and control variable methods to solve these issues. Secondly, the control object manipulation characteristics and dynamic fitting digital model are obtained based on a specific electric drive-tracked chassis. Thirdly, a linear quadratic regulator is used as the core path tracking algorithm, and a dual closed-loop trajectory tracking control algorithm based on the inverse dynamics fitting model is established for both lateral and longitudinal position feedforward + velocity feedback correction. Finally, systematic verification is conducted using the Simulink simulation environment and real vehicles. The verification results show that the proposed model identification method supports vehicle-level state fitting accuracy maintained within 3%, and the trajectory tracking control algorithm maintains tracking accuracy within 0.1m under extreme U-turn conditions. The dual closed-loop control structure enhances control accuracy and robustness.
The Fast Super-Twisting Sliding Mode Controller for a Class of Coaxial UAVs with Disturbance
Authors: Wang Yanqin , Fu Jian , Chen Zhi , Zhou Jie
Published: December 2024

In response to the flight attitude control issue of coaxial UAVs, a non-singular fast Super-Twisting sliding mode control algorithm for the attitude feedback control system is proposed. By analyzing the flight states of the coaxial UAV, a new nonsingular fast terminal Super-Twisting sliding mode control algorithm is designed for the attitude control system of UAV with established mathematical model. The experimental results show the effectiveness, stability and rapidity of proposed algorithm for the coaxial UAV, which are better than traditional sliding mode control algorithm.
Analysis of Application and Development of Sealing Structures for Special Vehicle Doors and Covers
Authors: Yan Zhiwu , Wu Kun , Liu Fang , Bao Zhiguang , Zhang Hongwei , Zhang Jiao , Wang Dehai , Zhao Ruoshi , Hou Liming
Published: December 2024

Special vehicles are equipped with doors and covers at various parts of the hull to meet the needs of personnel entry and exit as well as maintenance and servicing due to the functional and human factors engineering requirements. The airtight and watertight performance of these doors and covers directly affects the vehicle’s capabilities for biological and chemical protection and its ability to fording. A failure in sealing could endanger the safety of personnel inside the vehicle, and the sealing performance of doors and covers is closely related to the design of the sealing structure. Focusing on the design and usage characteristics of doors and covers for special vehicles, this paper analyzes various aspects including sealing mechanisms, sealing forms, and sealing structures. It discusses practical examples of sealing structures for doors and covers on special vehicles, and identifies the basic structural forms and development trends of sealing for doors and covers on special vehicles.