Stability analysis and evaluation of Shenguang-Ⅲ laser facility subjected to ambient vibration
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摘要: 在大型固体激光器结构稳定性设计中,数值模拟结果是结构稳定性设计的主要依据,故数值模拟的可信度至关重要。为了评估装置稳定性计算结果的可信度,基于现代模型验证与确认技术中关于不确定性源的量化及传播分析方法、模型形式误差与预测推断的叠加方法研究,对靶球结构的最大位移响应进行了预测推断。稳定性分析中为了快速进行不确定性参数的传播和灵敏度分析,使用二次响应面模型作为代理模型,灵敏度分析结果表明模态阻尼比对靶球结构的稳定性影响更大。对关心量的稳定性预测结果表明,靶球结构最大位移响应的上界与稳定性设计指标相比,安全裕度仍大于7,说明主机装置的稳定性设计具有足够的可信度。Abstract: In the stability design of a high-power laser facility, the simulation results are important references, and the reliability of the simulation results is important. In order to evaluate the reliability of the stability analysis results, the maximum displacement response of Shenguang-Ⅲ chamber is predicted based on uncertainty quantification and propagation methods, and the model form error and the prediction methods in the modern model verification and validation (VV). The quadratic polynomial response surface model is regarded as the metal model to improve the efficiency on the parameter propagating and sensitivity analyzing. The sensitivity analysis result shows that the modal damping ratios are more important than the mechanical parameters of the concrete. The stability prediction result of quantity of interest shows that the stability design margin of Shenguang-Ⅲ chamber is more than 7 times, which validates that the stability design of Shenguang-Ⅲ chamber is reliable enough.
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