Compare of Time Domain Method with Frequency Domain Method in Nonlinear Flutter Analysis for Panels of Supersonic Airplane Research on the Nonlinear Dynamics Analysis of Regenerative Tool Chatter

超声速飞行器壁板非线性 颤振 响应分析的 时域法与频域法对比研究再生型切削颤振的非线性动力学分析

The Effect of Different Initial Warfarin Dosages on the Time of Target International Normalized Ratio in Patients with Nonvalvular Atrial Fibrillation or Atrial Flutter

非瓣膜病房颤或 房扑患者应用不同起始剂量华法林对INR达标 速度的影响

The calculated characteristics of the time response in generalized axes is used to identify flutter or divergence occurred in the wing .

根据计算得到的广义坐标 时间响应的特性来判断机翼在给定来流条件下是否发生了 颤振或静发散。

Direct identification of aerodynamic rational function can meet the preliminary information of aerodynamic force for time domain and frequency domain of flutter analysis . So the establishment of corresponding theory and test technique has important practical engineering value .

直接识别气动力有理函数可以 同时满足 时域和频域 颤振分析对前期气动力信息的需求，相应的理论体系和试验技术的建立具有重要的工程实用价值。

Furthermore it performed the parametric analysis in terms of feedback gains and delayed time using the root locus method thus obtaining the system ′ s flutter stability boundary .

进而采用根轨迹方法就反馈增益和延迟 时间进行参数分析，获得系统的 颤振稳定性边界。

At the same time the substantiating test techniques have been described especially the analog simulation test technique sub-critical flutter test closed-loop test etc.

同时，还介绍了几种试验验证技术，主要是模拟仿真试验技术、亚临界 颤振试验、闭环系统试验等。

Method of Time Frequence Syntony for Flutter Boundary Prediction

颤振边界预测的 时频共振方法研究

At the same time by changing the structure damping ratio its influence to the flutter critical wind speed is also studied .

同时，通过改变结构阻尼比的大小，研究了结构阻尼对 颤振临界风速的影响。

In the acoustical design it can be used to control the reverberation time eliminate echo flutter echo sound focusing etc. In the noise control it can be used in sound absorption and noise reduction in the room .

在音质设计中用于控制混响 时间，消除回声、 颤动回声、声聚焦等音质缺陷；在噪声控制中用于室内吸声降噪以及通风空调系统和动力设备排气管中的管道消声等。

Using unsteady Euler codes to solve aerodynamic loads coupled with structural equations using improved Runge-Kutta time marching method the flutter of one-degree of freedom-buzz that often occurs in transonic flows is studied in time-domain .

运用非定常Euler方程求解气动力，耦合结构运动方程，采用改进的四步龙格- 库塔推进方法，在时间域内研究了音速附近发生的单自由 颤振问题。

Finally the 2D unsteady Navier-Stokes flow solver is coupled with two-degree-of-freedom flutter motion equation in time domain to investigate the flutter characteristics of several supercritical airfoils .

最后，本文将二维非定常 Nayier-Stokes方程解算器与颤振运动方程耦合，研究了超临界翼型的跨音速 颤振特性。