A novel simulation method for fuze warhead system (FWS) at very low altitude flight is proposed to solve adaptability issues of the traditional one in the naval battle. Firstly, a simulation system framework is presen...A novel simulation method for fuze warhead system (FWS) at very low altitude flight is proposed to solve adaptability issues of the traditional one in the naval battle. Firstly, a simulation system framework is presented. Then the detailed implementation of a novel general fuze model, a novel sea echo model and a novel warhead dynamic effectiveness power field algorithm including the simulation system are presented. Finally, simulation results show good performance of the proposed method. The proposed method can simulate the echo signal when the complex fuze antennas detect target and the sea at the same time, and can truly reflect the target positions hit by the warhead fragments. The proposed method can solve the existing problems in the FWS simulation system.展开更多
This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,...This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,from which the ball bearings are possible failures according to the results.Subsequently,three schemes against impact loadings,full-element deep groove ball bearing and integrated raceway,needle roller thrust bearing assembly,and gaskets are utilized for redesigning the actuator to effectively reduce the bearings’stress.However,multi-objectives optimization still needs to be conducted for the gaskets to decrease the stress value further to the yield stress.Four gasket’s structure parameters and three bearings’peak-peak stress are served as the four optimization variables and three objectives,respectively.Optimized Latin hypercube design is used for generating sample points,and Kriging model selected according to estimation result can establish the relationship between the variables and objectives,representing the simulation which is time-consuming.Accordingly,two optimization algorithms work out the Pareto solutions,from which the best solutions are selected,and verified by the simulation to determine the gaskets optimized structure parameters.It can be concluded that the simulation and optimization method based on these components is effective and efficient.展开更多
An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD (computational fluid dynamics) and the least-square method. Compared with the traditional ...An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD (computational fluid dynamics) and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3%. It satisfies the engineering requirements.展开更多
在当今军事技术的快速发展中,高速自锐侵彻战斗部在毁伤深埋高价值硬目标与多层建筑时,具有巨大的战略价值;文章通过建立动力学响应和磁场分析模型,深入研究自锐战斗部侵彻6 m C40混凝土靶板和多层钢筋混凝土靶板时引信的力学与磁场响...在当今军事技术的快速发展中,高速自锐侵彻战斗部在毁伤深埋高价值硬目标与多层建筑时,具有巨大的战略价值;文章通过建立动力学响应和磁场分析模型,深入研究自锐战斗部侵彻6 m C40混凝土靶板和多层钢筋混凝土靶板时引信的力学与磁场响应特性,为提高侵彻自锐战斗部毁伤精度提供支撑;在引信动力学响应的研究中,战斗部侵彻混凝土靶板历程,侵蚀后的靶板呈现出漏斗形状,随着战斗部侵彻的深入,应力波的稀疏效应逐渐减弱,战斗部的速度线性衰减,并在最终进入稳定侵彻模式的过程中,速度下降约52%;由于应力波在战斗部内部的传递与叠加导致引信位置检测的过载信号较为震荡;在引信磁场分析的研究中,地磁倾角为90°、地磁偏角为0°(即地磁场垂直于靶板中心线)时,X、Y轴磁通密度幅值小、信号无规律、穿层特征不明显;Z轴磁通密度幅值大、信号规则、穿层特征明显;地磁场强度越大,钢筋半径越大,地磁倾角越大,侵彻靶板层信号特征越明显。而Z轴磁通密度不受地磁偏角影响。展开更多
文摘A novel simulation method for fuze warhead system (FWS) at very low altitude flight is proposed to solve adaptability issues of the traditional one in the naval battle. Firstly, a simulation system framework is presented. Then the detailed implementation of a novel general fuze model, a novel sea echo model and a novel warhead dynamic effectiveness power field algorithm including the simulation system are presented. Finally, simulation results show good performance of the proposed method. The proposed method can simulate the echo signal when the complex fuze antennas detect target and the sea at the same time, and can truly reflect the target positions hit by the warhead fragments. The proposed method can solve the existing problems in the FWS simulation system.
基金The authors would like to acknowledge National Defense Pre-Research Foundation of China(Grant No.41419030102)to provide fund for conducting experiments.
文摘This paper presents an actuator used for the trajectory correction fuze,which is subject to high impact loadings during launch.A simulation method is carried out to obtain the peak-peak stress value of each component,from which the ball bearings are possible failures according to the results.Subsequently,three schemes against impact loadings,full-element deep groove ball bearing and integrated raceway,needle roller thrust bearing assembly,and gaskets are utilized for redesigning the actuator to effectively reduce the bearings’stress.However,multi-objectives optimization still needs to be conducted for the gaskets to decrease the stress value further to the yield stress.Four gasket’s structure parameters and three bearings’peak-peak stress are served as the four optimization variables and three objectives,respectively.Optimized Latin hypercube design is used for generating sample points,and Kriging model selected according to estimation result can establish the relationship between the variables and objectives,representing the simulation which is time-consuming.Accordingly,two optimization algorithms work out the Pareto solutions,from which the best solutions are selected,and verified by the simulation to determine the gaskets optimized structure parameters.It can be concluded that the simulation and optimization method based on these components is effective and efficient.
基金Sponsored by Project Fund From PLA Equipment Command (5140504204BQ4205) .
文摘An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD (computational fluid dynamics) and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3%. It satisfies the engineering requirements.
文摘在当今军事技术的快速发展中,高速自锐侵彻战斗部在毁伤深埋高价值硬目标与多层建筑时,具有巨大的战略价值;文章通过建立动力学响应和磁场分析模型,深入研究自锐战斗部侵彻6 m C40混凝土靶板和多层钢筋混凝土靶板时引信的力学与磁场响应特性,为提高侵彻自锐战斗部毁伤精度提供支撑;在引信动力学响应的研究中,战斗部侵彻混凝土靶板历程,侵蚀后的靶板呈现出漏斗形状,随着战斗部侵彻的深入,应力波的稀疏效应逐渐减弱,战斗部的速度线性衰减,并在最终进入稳定侵彻模式的过程中,速度下降约52%;由于应力波在战斗部内部的传递与叠加导致引信位置检测的过载信号较为震荡;在引信磁场分析的研究中,地磁倾角为90°、地磁偏角为0°(即地磁场垂直于靶板中心线)时,X、Y轴磁通密度幅值小、信号无规律、穿层特征不明显;Z轴磁通密度幅值大、信号规则、穿层特征明显;地磁场强度越大,钢筋半径越大,地磁倾角越大,侵彻靶板层信号特征越明显。而Z轴磁通密度不受地磁偏角影响。
