Dynamic response characteristics of the protection system for a projectile-borne recorder under high impact loading
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摘要: 为了给弹载记录仪的防护设计提供依据，从机械振动的角度揭示了高冲击载荷作用下弹载记录仪防护系统的动力学响应机理。在分析弹载记录仪内部载荷传递关系的基础上，基于双自由度弹簧-质量-阻尼系统建立了一种简化的防护系统动力学响应模型，并开展了数值模拟，通过脉冲响应分析和谐响应分析辨识了模型参数。理论计算与数值模拟的对比分析结果表明：建立的动力学响应模型能较准确地预测高冲击载荷作用下弹载记录仪防护系统的动力学响应特性。在此基础上，以模型的幅频响应特性为依据，分析了防护系统动力学响应特性随各种参数的变化规律。研究结果可为更有效地指导弹载记录仪的防护设计提供依据。Abstract: To provide an optimal direction for the protection design of a projectile-borne recorder, the dynamic response mechanism of the protection system for the projectile-borne recorder under high impact loading was revealed according to the mechanical vibration theory. On the basis of analysis for the load transfer relation, a simplified dynamic response model based on the two-degree-of-freedom spring-mass-damper system was established. To verify the credibility of the model, numerical simulation was carried out, and the parameters of the response model were identified according to the impulse response analysis and the harmonic analysis. Based on the result that the values of the theoretical calculation agreed well with those of the numerical simulation, it was concluded that the proposed model was more suitable to describe the dynamic response characteristics of the protection system under high impact loading. According to the amplitude-frequency response characteristics, the change of the dynamic response characteristics along various parameters was analyzed, which could be applied to guide the protection design of the projectile-borne recorder.
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图 9 不同频率正弦信号输入的模拟结果
Figure 9. Simulated results of sinusoidal signals with different frequencies
图 10 稳态幅值随正弦信号频率的变化规律
Figure 10. Steady amplitude curve of sinusoidal signals at different frequencies
图 11 不同固有频率时的幅频响应特性
Figure 11. Amplitude-frequency response characteristics at different natural frequencies
图 12 不同阻尼比时的幅频响应特性
Figure 12. Amplitude-frequency response characteristics at different damping ratios
表 1 材料参数
Table 1. Material parameters
材料 密度/
(kg·m−3)弹性模量/
GPa泊松比 屈服强度/
MPa安装基座 7 800 210 0.30 835 机械壳体 4 500 110 0.34 820 缓冲材料 1 500 0.15 0.41 50 电路组件 2 455 110 0.34 820 
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