基于形状记忆复合材料的水下低噪声火工分离装置设计与性能研究
Design and Performance Study of an Underwater Low-Noise Pyrotechnic Separation Device Based on Shape Memory Composites
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摘要:针对水下武器装备对低噪声分离技术的迫切需求，设计了一种基于环氧基形状记忆复合材料（SMC）的火工分离装置。以SMC为初始锁紧元件，利用火工药剂燃烧热量触发其变形解锁。通过动态热机械分析（DMA）测定材料玻璃化转变温度（208.5 ℃），并获取回复精度（13次循环后≥98%）及静态力学性能（纵向模量36.21 GPa）等关键参数。构建含点火器、火药柱与分瓣螺母的试验装置，通过水下噪声测试（1.5 m布点）及高速摄影冲击试验验证性能。装置分离冲击降至296g（较传统火工分离装置降低85%），水下噪声90.11 dB（低于100 dB目标），接近海洋自然噪声水平（80~90 dB）。实航测试（水平距离1 km）表明，装置工作噪声被航行噪声掩蔽，声学隐身特性显著。SMC与火工技术的结合实现了低冲击、低噪声分离，为水下隐蔽装备提供了新思路。
Abstract:To meet the urgent demand for low-noise separation technology in underwater weapon systems, a pyrotechnic separation device based on epoxy-based shape memory composites (SMC) was designed. The SMC serves as the initial locking element, and heat generated by pyrotechnic combustion triggers its shape recovery for unlocking. Key material parameters were obtained through dynamic mechanical analysis (DMA), including a glass transition temperature of 208.5 ℃, recovery accuracy ≥98% after 13 cycles, and longitudinal elastic modulus of 36.21 GPa. An experimental setup incorporating an igniter, propellant charge, and split nut was constructed. Performance was validated via underwater noise testing (measurement at 1.5 m) and high-speed photography for impact assessment. The device achieved a separation shock of 296g, representing an 85% reduction compared to conventional pyrotechnic devices, and an underwater noise level of 90.11 dB (below the 100 dB target), approaching the natural oceanic noise range (80~90 dB). Real navigation tests at a horizontal distance of 1 km demonstrated that the operational noise was masked by vessel background noise, indicating significant acoustic stealth performance. The integration of SMC with pyrotechnic technology enables low-shock, low-noise separation, offering a novel approach for stealthy underwater systems.
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