The history of experimental modal analysis began in the 1940's with work oriented toward measuring the modal parameters of aircraft so that the problem of flutter could be accurately predicted.
试验模态分析的历史始于1940年，用于测量飞机的模态参数，以准确预测颤振问题。
Based on analysis and study, this paper advances Suggestions and solutions to the problem about iron loss increasing of punched cold-rolled non-oriented silicon steel sheet after heat treatment.
针对冷轧无取向硅钢冲片在热处理后铁损值升高的问题进行了分析研究，并提出了解决措施和建议。
To deal with this problem, a net-like model of the knowledge-oriented manufacturing system was constructed which was applicable in bottleneck analysis in flexible product line.
为此，建立了知识化制造系统的网状模型，该模型适用于柔性生产线的生产瓶颈分析。
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