频率波动 frequency fluctuation; frequency flutter; frequency jitter 国外汇兑，外汇 foreign exchange .
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Then the gradients of flutter speed and frequency of wing with respect to the design variables were deduced with analytical method.
使用解析方式推导得到机翼的临界颤振速度、颤振频率对于设计变量的灵敏度表达式。
The sensitivity formulas about natural frequency and flutter damp to structure parameters were discussed, and the math models about optimization design were established.
建立固有振动频率和颤振阻尼对结构参数的敏度公式，设计两种不同优化问题的数学模型。
The variation of aerodynamic parameters of cascade NACA0012 and PROF under different reduced frequency shows that the reduced frequency is an important factor that influences the flutter.
NACA0012和PROF叶栅在不同折合频率下气动参数随时间的变化表明，折合频率是影响叶栅颤振的重要因素。
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