| 1. | Simulations for identification of flutter derivatives of bridge section using the coupled - forced - vibration method
桥梁颤振导数的耦合强迫振动仿真识别 |
| 2. | A comparative study between time - domain method and frequency - domain method for identification of bridge flutter derivatives
桥梁颤振导数识别的时域法与频域法对比研究 |
| 3. | The researcher also concludes that in the range of reduced velocity , the flutter derivatives equal to the function of it
在折减风速的实用范围之内，颤振导数只是折减风速的函数。 |
| 4. | The identification of flutter derivatives for bridge sectional model has long been a key issue in long - span bridge flutter and buffeting analysis
长期以来，桥梁断面颤振导数的识别都是大跨度桥梁颤抖振响应分析中的重点和难点问题。 |
| 5. | And the result shows that the self - excited loads and the flutter derivatives satisfying the linear relationship as to the streamline section - like thin plate
结果表明对薄平板这一类近乎流线体的断面，自激力与振动参数之间能较好地满足线性关系。 |
| 6. | 2 . a systematic test has been carried out to observe how the model actuating frequencies and amplitudes affect the flutter derivatives , and the effect is found to be quite minor
通过系列试验考查了模型驱动频率和振幅对颤振导数的影响，验证了驱动频率和振幅对颤振导数影响很小。 |
| 7. | While the flutter self - excited loads of a bluff section has a quality of obvious nonlinearity . and the application of flutter derivatives to self - excited loads of the bluff section is close to a linear relationship . 5
而钝体断面的颤振自激力高次谐波分量较大，具有较明显的非线性响应特征，验证了用颤振导数表示钝体的自激力只是一种线性近似。 |
| 8. | A test has been carried out on three typical bridges sectional models of flutter derivatives to find the general rules with the change of flutter derivatives of the bridges sectional model . and it has been discovered that this change depend on the torsional damping , an element closely relating to the h * 2 and a * 2 4
通过对三种典型断面颤振导数的测试，考查了各颤振导数随断面形状的变化趋势，说明了最主要的变化体现在与扭转阻尼有关的h _ 2和a _ 2项。 |
| 9. | The result of the experiment shows that the proposed forced vibration method device has the quality of stability and repetitiveness of the data , the wide range of the testable reduced velocity , the exactness of coupled and direct flutter derivatives . and it does not need to employ any complicated identification system to check it further
结果显示：本文提出的强迫振动法装置具有试验数据稳定、数据重复性好、可测量的折减风速范围宽、交叉项导数与对角项导数具有同等精度和不需要复杂的系统识别过程等一系列优点。 |
| 10. | As to the current problems existing in the identification for these flutter derivatives , the dissertation tries to trace the development in the identification for the past unsteady aerodynamic forces of long - span bridges . it also investigates the method for flutter and buffeting analysis and the flutter derivatives . based on the present methods used in obtaining the unsteady aerodynamic forces and flutter derivatives , and co - funded by a natural scientific fund from the nation and a key project fund from the railway ministry , the current research has attempted to develop a device which can be employed in the wind tunnel to test flutter derivative through a forced vibration method
鉴于目前桥梁断面颤振导数识别的水平和存在的问题，本文通过对大跨度桥梁非定常气动力、颤振分析方法及颤振导数识别方法的回顾和评述，基于现有的非定常气动力和颤振导数的测试方法，在国家自然科学基金与铁道部重点学科基金的联合资助下，研究开发了一套在风洞中采用强迫振动法测试颤振导数的装置。 |
