涡动力学是研究非定常空气动力学的一个有力切入点。
Vorticity dynamics is a good break point when researching unsteady aerodynamics.
本文提出了利用卡尔曼滤波技术识别线性定常振动系统参数的方法。
This paper presents a new method for identifying parameters of linear time-invariant vibration system by the use of Kalman filtering technique.
由于理论研究和实际应用的需要，非定常空气动力学模型的研究变得尤为重要。
In need of theoretical research and practical application, the study of unsteady aerodynamics model has become particularly important.
准确数值模拟机翼动态失速时非定常流场主要有湍流模型和数值算法两方面的难点。
The numerical simulation of the unsteady flow field around an oscillating airfoil is difficult because of the complexity of turbulence models and numerical methods.
实验证明，这种流量计不仅结构非常简单、实用，而且对非定常流量的测定具有较高的精度。
It is clarified by experiments that the flowmeter used for measuring unsteady flow is not only simple but also precise and practical.
并与定常条件下的计算结果进行了比较。
The results were also compared to those in steady conditions.
近年来，非定常问题受到了较大的关注。
In the recent years, more and more attention has been paid to unsteady problems.
非定常流下的数值模拟。
定常流下的数值模拟。
非定常力可以采用面元法或升力面方法计算得到。
Both panel method and lifting surface method can be used to calculate the unsteady force.
三维定常、非定常的计算结果表明本文的方法是有效的。
The results of three dimensional steady and unsteady flows show that the methods developed in the thesis are effective.
完成了超音速燃烧室内非定常准一维流的数值模拟研究。
A quasi one dimensional unsteady numerical analysis of supersonic combustor performance has been conducted.
本文给出了关于离散定常线性系统的稳定性的一个定理。
In this paper, a theorem on stability of discrete linear time-invariable systems is presented.
定常计算采用当地时间步法，非定常计算采用双时间步法。
For steady computation, local time step method is used; for unsteady computation, dual time stepping method is used.
该软件使用SOR方法来求解大规模定常热传导工程问题。
The software was used to solve big engineering problems of heat exchange via SOR.
本文讨论了日冕磁环中是否存在定常的高速虹吸流动的问题。
In this paper, whether the steady high-speed siphon flow exists in coronal magnetic loops is discussed.
使用跨音速非定常空气动力，对扑动间隙和旋转间隙进行研究。
Flapping and rotary gap have been investigated with the help of transonic unsteady aerodynamic forces.
这些系统能够用定常差分方程，有时甚至能用代数方程来描述。
They are described by ordinary difference equations, or in some cases by purely algebraic equations.
定常力输出机构就是在一定的输入范围内输出一恒定力的机构。
Constant-force-output mechanisms produce a constant output force for a range of input displacements.
本文采用逆方法研究并获得了应力偶流体的定常和非定常精确解。
By using inverse method, the analytical solutions of couple stress fluids were obtained for steady and unsteady cases.
计算结果表明，振荡叶栅非定常流场的压力响应在叶栅前缘较大。
The results show that the unsteady pressure response is large in the oscillating cascade leading edge.
针对线性定常系统，提出了考虑执行器故障的可靠极点配置问题。
Aiming at linear time-invariant system, puts forward the reliable pole placement problem considering actuator fault.
下游静叶干涉增加了动叶顶部间隙流的非定常波动强度和泄漏损失。
Downstream rotor-stator interaction increases the unsteady fluctuating intensities of the rotor tip clearance flow and the tip leakage loss.
本文提出了用小扰动欧拉振幅方程求解振动叶栅非定常流场的方法。
In this paper, the Euler amplitude equation is developed to obtain the unsteady flow field in vibrating cascades.
本文介绍一种带操纵面机翼的非定常跨声速流的有限差分计算方法。
A numerical method is presented for predicting unsteady transonic aerodynamic flow about aircraft wings with control surface.
本文采用数值方法对叶轮机基元非定常流和排间匹配进行深入研究。
Numerical studies about cascade unsteady flow and the edge-matching technique are presented in this paper.
对于发生变化的动态经济过程，应用定常参数模型进行预测时误差较大。
In forecasting dynamic economic processes by using the model with steady parameters, large errors are often discovered.
本文介绍了线性定常系统稳定性几何判据的原理及其计算机作图的实现。
This paper introduces the principle of geometric justification of stability in a linear ordinary system and realization of computer graphing.
本文介绍了线性定常系统稳定性几何判据的原理及其计算机作图的实现。
This paper introduces the principle of geometric justification of stability in a linear ordinary system and realization of computer graphing.
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