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罗祎 , 陈鑫 . 水下空气腔角反射器声散射特性 [J ] . 兵工学报 , 2019 , 40 ( 10 ): 2129 - 2135 . DOI: 10.3969/j.issn.1000-1093.2019.10.019 http://doi.org/10.3969/j.issn.1000-1093.2019.10.019 针对水下金属板角反射器目标强度低、具有明显的频率特性等不足，设计了一种新的弹性空气腔角反射器。采用结构有限元耦合流体边界元法，对水下空气腔角反射器和单层金属薄板角反射器的声散射特性进行仿真计算和对比，分析了入射波频率为5～15 kHz范围内，平板厚度、入射角度等因素对不同类型角反射器目标强度的影响及其散射机理并进行了实验验证。研究结果表明：空气腔角反射器散射强度大，无明显的频率特性，去耦作用明显；空气腔角反射器声散射仿真结果和消声水池实测数据进行对比，二者基本一致；相比笨重且回波强度较弱的单层金属板角反射器，空气腔角反射器具有更优的反声性能和更轻的质量，是理想的水下声反射装置。

LUO Y , CHEN X . Acoustic scattering characteristics of underwater air-filled cavity corner reflector [J ] . Acta Armamentarii , 2019 , 40 ( 10 ): 2129 - 2135 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2019.10.019 http://doi.org/10.3969/j.issn.1000-1093.2019.10.019 In accordance with the weakness of low target strength and obvious frequency characteristics of underwater elastic metal plate corner reflectors, a new air-filled cavity elastic corner reflector is designed. The scattering acoustic fields of underwater air-filled cavity corner reflector and single layer metal sheet corner reflector are simulated and compared by using the structural finite element coupled fluid boundary element method (IBEM). The influences of thickness and incident angle on the target strengths and scattering mechanisms of different corner reflectors within 5-15 kHz frequency of incident wave are analyzed and verified through experiment. The research results show that the air-filled cavity corner reflector has great scattering intensity and no obvious frequency characteristics, and the decoupling effect is obvious. The simulated results are in basic agreement with the experimental results. Compared with the cumbersome single layer metal corner reflector with weak reflection intensity, the air-filled cavity corner reflector has better acoustic reflection performance and lighter weight, and is an ideal underwater acoustic reflection device. Key

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HONG Z Z S , ZHANG H , MA C C , et al. Multi-field stress response of centrifugal compressor impeller in variable altitude environment [J ] . Acta Armamentarii , 2021 , 42 ( 3 ): 478 - 486 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.03.004 http://doi.org/10.3969/j.issn.1000-1093.2021.03.004 The change laws of multi-field load and stress response of turbocharger centrifugal compressor impeller are studied for the static strength failure of impeller in a variable altitude environment. The unidirectional steady-state fluid-structure interaction method is used to calculate the single-field stress and multi-field coupling stress of impeller under aerodynamic, thermal, and centrifugal loads. The results indicate that, when only the inlet pressure and inlet temperature are changed according to the altitude without changing the true flow rate and the true revolving speed, the flow angle at impeller inlet increases with altitude, resulting in a larger static pressure difference on the leading edge of the long blade; and the maximum aerodynamic stress is then transferred from the trailing edge to the leading edge of the long blade. In the same case, the thermal load, thermal stress and maximum coupling stress decrease with altitude. When the working conditions of the supercharged engine remain unchanged, with the increase in altitude， the absolute changes in the aerodynamic and thermal stresses of the impeller are small, and the increase in the compressor speed brings a large increase in the centrifugal stress, which in turn leads to an increase in coupling stress.

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张宝振 , 王汉平 , 窦建中 , 等 . 发射筒易碎前盖开盖过程的流体与固体耦合仿真方法 [J ] . 兵工学报 , 2021 , 42 ( 8 ): 1660 - 1669 .

ZHANG B Z , WANG H P , DOU J Z , et al. Fluid-structure coupling simulation method for the opening process of fragile front cover of canister launcher [J ] . Acta Armamentarii , 2021 , 42 ( 8 ): 1660 - 1669 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.08.010 http://doi.org/10.3969/j.issn.1000-1093.2021.08.010 The opening process of fragile front cover of canister launcher in the pressure wave is a typical fluid-structure interaction problem. In order to study this opening process, the static tensile and compression test，and the dynamic tensile and compression test are carried out on the polyurethane composite material of fragile front cover，respectively. The subroutine VUSDFLD is used to expand the concrete damage plasticity (CDP) constitutive model to describe the loading and cracking conditions of the fragile front cover. Based on the computational fluid dynamics (CFD) simulation results of the flow field in the canister launcher, an Euler’s method-based model of the same case is built and verified, and the opening process of the fragile front cover is simulated by the coupled Eulerian-Lagrangian (CEL) algorithm. It shows that the simulated results based on the developed CDP model are in good agreement with the experimental data; and the simulation method combining CFD and CEL algorithms can effectively solve the fluid-structure interaction problem of opening process of fragile front cover and has higher accuracy.

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田金山 , 宁克焱 , 庞惠仁 , 等 . 齿形线圈励磁的新型电涡流缓速器电磁特性 [J ] . 兵工学报 , 2023 , 44 ( 1 ): 290 - 297 . DOI: 10.12382/bgxb.2022.0709 http://doi.org/10.12382/bgxb.2022.0709 针对重载车辆用快响应、易控电涡流缓速器功率密度低的问题，提出一种利用轴向凸起的齿形线圈构建三维磁路，并通过过励磁设计抑制去磁效应的新型电涡流缓速器。应用有限元技术，建立新型高能电缓与传统端面磁路、轴面磁路电缓稳态、似稳态电磁场计算模型，分析新型电缓的磁路、气隙磁密、电涡流分布和过励磁制动特性。结果表明，新型电缓电涡流分布在转子内表面整个轴向空间内，当转速小于3 500 r/min时，其制动扭矩明显高于另两种传统电缓，且过励磁设计能够有效提升新型电缓的制动性能，线圈电流密度提高至3倍时，制动扭矩增加0.65倍，能够为车辆紧急制动提供瞬时大扭矩，使车辆制动距离缩短30%。

TIAN J S , NING K Y , PANG H R , et al. Study on electromagnetic characteristics of a novel eddy current brake excited by toothed coils [J ] . Acta Armamentarii , 2023 , 44 ( 1 ): 290 - 297 . (in Chinese) DOI: 10.12382/bgxb.2022.0709 http://doi.org/10.12382/bgxb.2022.0709 To improve the power density of fast-response and easily controlled eddy current brakes for heavy-duty vehicles, the method of constructing a three-dimensional magnetic circuit by using axially convex toothed coils and overexcitation design technology are proposed. Based on the finite element method, the steady-state and quasi-steady-state electromagnetic field calculation models of the novel high-energy eddy current brake and two traditional eddy current brakes are established, and their magnetic circuit, air gap magnetic density, eddy current distribution and overexcitation braking characteristics are analyzed. The results show that the eddy current of the novel high-energy eddy current brake is distributed in the whole axial space on the inner surface of the rotor. When the speed is less than 3 500 r/min, its braking torque is significantly higher than the other two traditional eddy current brakes. And the overexcitation design can effectively improve the braking performance. Since the coil current density is increased to 3 times, the braking torque is increased by 0.65 times, which can provide instantaneous high torque for vehicle emergency braking and shorten the braking distance of the vehicle by 30%.

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