| 1. | Equation(4－198)yields a first approximation for the change in the natural frequency of vibration .
方程（4198）给出了一级近似下的固有振动频率的改变量。 |
| 2. | Equation ( 4 198 ) yields a first approximation for the change in the natural frequency of vibration
方程（ 4 198 ）给出了一级近似下的固有振动频率的改变量。 |
| 3. | In this essay , the answer to natural frequency of vibration and periodic time will given in the response spectrum method
而本文是通过反应谱法，求解泵站的自振频率、周期。 |
| 4. | The results indicate that the natural frequency of vibration of multispan stone arch bridge is closely packed and it has adequate safety allowance
研究结果表明，多跨度石拱桥作为一个整体，其自振频率较为密集，桥梁具有足够的安全裕量。 |
| 5. | These phenomena are roots of the unsteady excitation . ansys was used to solve the structure dynamic equations to obtain the natural frequency of vibration and mode shape of the blade
本文应用工程软件ansys完成了叶片的振型和自振频率分析，结合数值计算得出的气动激扰，进行了叶片的共振分析。 |
