Impact analysis of shock environment from floating shock platform on equipment response
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摘要: 对浮动冲击平台提供给设备的冲击环境及舰载设备在不同冲击环境下的响应进行了数值模拟和理论分析。以美国中型浮动冲击平台为计算模型，将设备基座的冲击环境与德国规范BV 043-85进行了比较，为分析两个体系在设备抗冲击要求中谱加速度的差异，对不同舰载设备进行数值模拟计算，并通过虚拟约束边界模态方法，提出不同冲击环境下基础激励的多自由度系统响应的计算方法。数值分析及理论计算结果表明：冲击谱中谱加速度对舰载设备响应影响较小，而谱位移和谱速度对设备响应有较大影响，理论计算得到的多自由度系统响应与数值模拟结果较一致，同时在进行浮动冲击平台设计时可不考虑谱加速度对设备响应的影响。Abstract: The shock environment of floating shock platform for the equipment and the response of ship board equipment under different shock environment were studied by numerical simulation and theoretical analysis. Based on the calculation model of American intermediate floating shock platform, the shock environment of equipment base was compared with German BV specification. In order to analyze the difference of spectrum acceleration between the two systems in impact requirements of the equipment, numerical simulations for different ship board equipment were carried out. Through the modal method of virtual constraint boundary, a model for the multi-degree freedom system with basic excitation under different shock environment was proposed. Numerical analysis and theoretical results show that the spectrum acceleration of shock spectrum has little effect on the response of ship board equipment, but spectrum displacement and velocity have significant effect on equipment response. The response of multi-degree freedom system analyzed by theoretical calculations is consistent with the numerical simulation results. Meanwhile, during the design of floating shock platform, the influence of spectrum acceleration on equipment response does not need to be considered.
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图 4 增大谱加速度后增压锅炉响应
Figure 4. The response of supercharged boiler after increasing the spectrum acceleration
图 5 规范BV 043-85要求冲击环境下齿轮箱响应
Figure 5. The response of gearbox under the shock environment of BV 043-85
图 6 增大谱加速度后齿轮箱响应
Figure 6. The response of gearbox after increasing the spectrum acceleration
表 1 不同基础激励的系统位移响应幅值
Table 1. The amplitude of displacement response
基础激励 A/cm 子结构1 子结构2 子结构3 基座 初始冲击环境 1.7 0.9 2.6 0.5 a=280g 1.8 0.9 2.5 0.5 v=4 m/s 1.5 1.8 3.9 0.9 d=5 cm 1.6 2.3 2.6 1.1 
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