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模态截断
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  “模态截断”译为未确定词的双语例句
    First Derivation of Vibration Modes for Truncated Model
    模态截断时振型的一阶导数
短句来源
    Bifurcation problems of the Lorenz equations of obtained from the Navier-Stokes equations for the flow between two concentric rotating spheres is discussed.
    对同心球间旋转流动的N av ier-S tokes方程谱展开后进行三模态截断,讨论了所得到的类Lorenz型方程组的分歧问题.
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  truncated model
One model of incomplete observations studied in the literature is the truncated model, where bothXi andYi are observed ifXi ≥Yi, and nothing can be observed otherwise.
      
The measured excitation energies were compared with spherical shell-model predictions obtained from suitably truncated model spaces.
      
The harmonic coefficients of a truncated model can then be obtained by solving linear systems.
      
If random cross validation is used to choose a truncated model, data should be adjusted for replicate differences within environments.
      
On a 3-component truncated model of a barotropic non-divergent rotating atmosphere in spherical geometry
      
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A set of formulas calculating higher-order updates and gradient for dynamic responses is derived by setting up the mapping relationship between the design variables space and the re-analysis variables space, hence, higher-order directional derivatives of dynamic response and the Taylor-series representation of dynamic reponse updates considered in the re-analysis variables space. and the technique of modal analysis is utilized. What is significantly noteworthy is that the computational effort needed in obtaining...

A set of formulas calculating higher-order updates and gradient for dynamic responses is derived by setting up the mapping relationship between the design variables space and the re-analysis variables space, hence, higher-order directional derivatives of dynamic response and the Taylor-series representation of dynamic reponse updates considered in the re-analysis variables space. and the technique of modal analysis is utilized. What is significantly noteworthy is that the computational effort needed in obtaining the expression of the convergent series is based entirely on the first-order information. The formulas are suitable to the dynamic response optimal design of large scale structures where the modal truncation can be employed to reduce the computational costs. Numerical examples are provided to illustrate accuracy and efficiency of the proposed procedures.

本文通过建立设计变量空间到重分析变量空间的映射关系,然后在重分析变量空间,考虑动响应高阶方向导数及动响应修改量的泰勒级数表达式,利用模态分析技术,推导出一套动响应高阶修改和计算动响应梯度的公式。其工作量完全同于一阶导数修改。公式适合于采用模态截断来限制计算代价的大型飞机结构动态优化设计。算例表明公式具有高精度和高效率。

This paper deals with the method to carry our computaion of the first de-n ation of vibration model for the condition of truncated mode, by means of which the first derivation of vibration model could be obtained just only by using reserved model and system matrixes.

本文研究了模态截断情况下,只用保留模态和系统矩阵来计算振型一阶导数的方法。

It is very important to calculate the sensitivities of the Frequency Response Function (FRF) in the areas of vibration control, structural optimization and so on. Based on the theory of modal superposition and power series expansion, a modal superposition method for the sensitivity analysis of FRF is proposed in this paper. In order to reduce the error of modal truncation in modal superposition, a modal acceleration method is derived at the same time. The acceleration algorithm can improve the accuracy of the...

It is very important to calculate the sensitivities of the Frequency Response Function (FRF) in the areas of vibration control, structural optimization and so on. Based on the theory of modal superposition and power series expansion, a modal superposition method for the sensitivity analysis of FRF is proposed in this paper. In order to reduce the error of modal truncation in modal superposition, a modal acceleration method is derived at the same time. The acceleration algorithm can improve the accuracy of the sensitivities quickly when modal truncation is adopted. Numerical example is also provided to demonstrate the efficiency of the proposed methods.

响函数灵敏度分析在结构动力优化和振动控制等许多领域中有着广泛的应用。基于模态展开和幂级数展开原理,提出了一种频响函数灵敏度分析的模态展开法。为了减少模态展开时的模态截断误差,文中同时给出了一种模态加速方法,该方法可大大提高模态截断时的灵敏度分析精度。通过对一数值实例计算表明,文中提出的方法非常有效。

 
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