侵彻战斗部-引信宽频域加载特性

Analysis of Loading Characteristics of Penetrating Warhead on Fuze in Wide Frequency Domain

为揭示侵彻过程中战斗部对引信边界载荷的影响规律,建立战斗部动力学模型和有限元模型。通过有限元差分法计算和数值模拟分析战斗部在不同频率半正弦信号激励下对引信的瞬态加载特性,并采用数值模拟和打靶试验研究弹靶作用时弹体和引信体的过载时域响应特性,通过冲击响应谱数值计算得到引信过载在频域范围的响应放大倍数。研究结果表明:侵彻战斗部在宽频域范围具有明显的轴向振动放大特性。引信过载频响特性与谐响应分析结果表明,侵彻战斗部在宽频域范围轴向振动放大特性的根本原因是战斗部1阶或多阶轴向振动固有频率的谐振,为指导弹载产品的抗高过载优化设计提供了依据。

A dynamic model and a finite element model of warhead are established to reveal the influence of warhead on the boundary load of fuse during penetrating.The transient loading characteristics of warhead on the fuze under the excitation of semi-sinusoidal signals with different frequencies are analyzed by using the finite element difference method and numerical simulation.The time-domain response characteristics of projectile and fuze under the impact of projectile on a target are studied through numerical simulation.Furthermore,the amplification factor of fuze overload response in the frequency domain is calculated by useing the shock response spectrum value.The results indicate that the penetrating warhead exhibits significant axial vibration amplification characteristics in a wide frequency range.The analyzed results of the overload frequency response characteristics and harmonic response of fuze indicate that the fundamental reason for the axial vibration amplification characteristics of penetrating warhead in a wide frequency range is the resonance of natural frequency of the first-order or multi-order axial vibration of warhead,which provides a basis for guiding the optimization design of high overload resistance of missile-borne products.