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模态截断
相关语句
  modal truncation
    Seismic Analysis of the Primary-secondary Coupling Structural System with Multi-connections by Using Modal Truncation Technique
    利用模态截断技术分析多点连接主次结构耦合系统的地震反应
短句来源
    Considering the incompleteness of measured structural mode shapes, the practical complete modal space theory is used to eliminate the influence of modal truncation error.
    考虑到所测的结构模态是不完备的,应用完备模态空间理论将未测的结构高阶模态用等效高阶模态来代替从而消除模态截断误差的影响。
短句来源
    Based on the modal truncation method and some approximate treatments,a structural mean square dynamic response expression under narrow-band random excitations as well as their sensitivities are derived. According to engineering practical requirements,a set of topology optimization formula and its procedure,with static loads and narrowband random excitations on the structure,are built. Numerical examples show that the method proposed is of good rationality and efficiency in engineering application.
    基于模态截断法和一些近似处理,导出了一套窄带随机均方动响应及其灵敏度公式,再根据工程实际要求,研究了静载荷和窄带随机载荷作用下结构的动力学拓扑优化设计方法和算法,提供的算例显示了本方法的合理性和有效性。
短句来源
    The mathematical model of the primary-secondary coupling structural system with multi-connections is proposed. By using modal truncation technique,the frequency-domain modal transfer function and displacement response of the primary and secondary structures are obtained respectively. The root mean square of displacement responses are calculated by integrating the power spectral density functions in frequency domain.
    建立了多点连接主次结构耦合系统的数学模型,并利用模态截断技术求出各自的模态响应传递函数和位移响应,以主次结构系统的位移功率谱密度函数在整个频率域内的积分得到位移响应的均方根值并与精确解进行比较.
短句来源
  mode truncation
    Partial derivatives of eigenvalues and eigen vectors with respect to random variables for structures are deduced by means of the concept of mode truncation.
    为求出随机特征对的方差 ,借助于模态截断概念推出诸特征值与特征向量对随机变量的偏导数。
短句来源
    Since the modes of foundation are dense,by taking the criterion of energy response as mode truncation index,the energy norm and criterion are established to calculate the mode truncated order of dynamic compaction response.
    由于地基模态密集,提出以能量响应信息的收敛作为模态截断的判断指标,建立能量范数和能量判据,计算强夯动力响应的模态截断阶数。
短句来源
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  modal truncation
Dynamic modeling and modal truncation approach for a high-speed rotating elastic beam
      
Since using lower-order transverse modes for modal truncation obviously can cause error, addition of more transverse modes may improve the result.
      
The effect of modal truncation and means to approximate corresponding dynamic displacement residuals are discussed for linear, anisotropic solid bodies and structures with general damping.
      
In this paper we examine order reduction of parabolic systems using modal truncation.
      
In the common method of modal truncation controllability constraints are first reformulated as an infinite sequence of moment equations, which is then truncated to a finite set of equations.
      
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  mode truncation
A new six-mode truncation of the Navier-Stokes equations on a two-dimensional torus: A numerical study
      
A model obtained via a six-mode truncation of the Navier-Stokes equations for an incompressible fluid on a two-dimensional torus is studied.
      
A five-mode truncation of the Navier-Stokes equations on a three-dimensional torus
      
In the former case a behavior is found which is quite similar to the ones of the Lorenz model and of a 5-mode truncation of the two-dimensional Navier-Stokes equations previously studied.
      
Sequences of infinite bifurcations and turbulence in a five-mode truncation of the Navier-Stokes equations
      
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This paper illustrates the method, based on modern control theory, for analyzing earthquake response of long-span structures in time domain. The earthquake is a non-stationary stochastic process,imparted the supports of the structure with time differences.The mode truncation technique is used for reducing the degree of freedom. This method is quite suitable for solution on computers.

本文用现代控制理论的时域方法对大跨度建筑物进行地震响应分析。将地震作用作为非平稳随机过程对待,结构支点处的输入有时间差。对于多跨结构采用模态截断法以缩减系统的自由度。文章所提供的方法易于在计算机上求解。

The presented time domain method for dynamic load identification tra- nsforms the equation of motion into the modal coordination. Then the modal force function can be identified under the assumption that within a small time interval the dynamic loads are step functions, and the time history of dynamic loads can be determined by inverse modal transformation. Some problems like modal truncation, the number of measuring point less than modal number, the number of identified load greater than modal number, the se1ection...

The presented time domain method for dynamic load identification tra- nsforms the equation of motion into the modal coordination. Then the modal force function can be identified under the assumption that within a small time interval the dynamic loads are step functions, and the time history of dynamic loads can be determined by inverse modal transformation. Some problems like modal truncation, the number of measuring point less than modal number, the number of identified load greater than modal number, the se1ection of time interyal and the noisy error in sampling data etc. will influence the precision of the load during the identifying. In this paper, the way to solve these problems will be discussed, and a simulation example is carried out to explain it.

已提出的识别动态力时域方法将系统的运动方程作模态坐标转换,认为在离散的 时间间隔中载荷是一个阶跃力.于是非耦合的方程可以逆解出动态载荷的时间历程。 在识别计算的过程中会出现一些问题,如模态截断、测点数少于模态数、识别力数多 于模态数、时间间隔的确定以及采样中的噪声干扰等,这些问题都会影响识别力的 精度。文中探讨了解决这些问题的途径,并以仿真实例加以说明。

The method for control of flexible beams transverse vibration with semi active stayed cable made up of magneto rheological damper is proposed, and the practicability, practical controlling scheme and its controlling algorithm are discussed. The simulation results for five different cases are presented. It is found that the semi active control method for flexible beams transverse vibration with semi active stayed cable composed of magneto rheological damper can avoid the “spillover” resulted from “modes...

The method for control of flexible beams transverse vibration with semi active stayed cable made up of magneto rheological damper is proposed, and the practicability, practical controlling scheme and its controlling algorithm are discussed. The simulation results for five different cases are presented. It is found that the semi active control method for flexible beams transverse vibration with semi active stayed cable composed of magneto rheological damper can avoid the “spillover” resulted from “modes truncation”, and are low power relied on and strong robust.

提出采用磁流变阻尼器构成的半主动斜拉索实现柔性梁横向振动的半主动控制 ,讨论了其可行性、具体控制方案和控制算法 .同时给出了在五种不同情况下的控制仿真结果 ,表明采用磁流变阻尼器实现结构半主动控制能避免“模态截断”而引起的“溢出”问题 ,具有能耗小、鲁棒性强的特点 .

 
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