The magnification change has no influence on boundary frequency while the nonlinearity of damping, time constant and pure time delay are its main influencing factors. 放大倍数不改变系统的分界频率,但阻尼大小、时间常数和纯延时等非线性环节是影响分界频率的主要因素。
A one way wave equation based on the second order absorbing boundary condition in frequency domain 一种基于单向波方程的频域二阶吸收边界条件
Influence of Boundary Condition on High Frequency Inducting Plate Bending 船舶板材边界条件对高频感应弯板成形的影响
2, Influence of varying effective index and stochastic deviations of domain boundary on the conversion efficiency of difference frequency generation ( DFG) in quasi-phase-matching ( QPM) waveguides are analyzed. 分析了变有效折射率和畴边界随机偏差对准相位匹配波导中差频转换效率的影响。
The research showed the relationship between the boundary conditions and the blade natural frequency, and offered the theoretical foundation for the numerical study of blade model and failure analysis. 通过大量的数值模拟,得出了各种边界条件与叶片固有频率变化关系,进而提出了弹性模拟叶片边界约束的计算模型,为叶片模态有限元数值计算及故障分析提供了理论基础。
An approach, which can be called boundary spectrum and energy of frequency belt, is proposed based on the local wave spectrum. With these methods we can find the fault in rolling machine and reciprocating machine. 提出了基于局域波时频谱的边界谱分析,以及频带能量分析方法,并运用这些方法对旋转机械和往复机械的不同故障进行了有效的诊断。
Mixed boundary and frequency dispersion suppressing in elastic wave numerical simulation 弹性波数值模拟的混合边界与频散抑制
Inversion method of a single magnetic boundary in the frequency domain 频率域磁性单界面反演方法
This paper discussed the methods for treating the boundary conditions of T steam turbine blade by finite element model analysis, analyzed the influence of various of the boundary conditions on the natural frequency of blade, and advanced the elastic computing model simulated the boundary conditions. 对汽轮机叶片有限元模态分析的边界条件处理方法进行了探讨,分析了各种边界条件对叶片自振频率的影响。
Frequency Band Boundary Problem of Wavelet Frequency Characteristics 小波频率特性的频带边界问题
Effect of Force Boundary Conditions on Accuracy of Natural Frequency of Beam by Rayleigh-Ritz Theory 力边界条件对瑞利-李兹法求梁固有频率的影响
By detecting and comparing the difference between currents at both sides of the boundary in selected frequency band, the fault section can be determined by the locator. 通过比较边界两侧特定频段电流成分的差异,自主判断故障区段。
Compared with the nomal consonants acoustic analysis of the disordered ones showed that, the lower boundary frequency got down, spectrum distribution in frequency became widen, as well as the lower frequency components were enhanced. 语音声学分析显示,与正常辅音相比,有发音错误的辅音频率下限下移,频率分布范围变宽,低频成份增加。
It is pointed out that there is a boundary problem for most frequency band boundary frequencies: the frequency band energy leaps at the left and right sides of the boundary frequencies, and the leap directions are reverse. 在边界频率左、右两侧,频带能量有巨变现象,并且能量的跳变方向相反。
The coupled viscous boundary could be used not only in frequency domain but also in time domain. 本文耦合粘性边界是和频率无关的,可以适用于频域和时域的计算。
In this paper, according to the equivalence principles, far field approximation and boundary conditions, high frequency approximation method has been developed to analyze the EM scattering by a rectangular conducting flat plate coated with radar absorbing material ( RAM). 根据等效原理、远场近似和边界条件,采用高频近似方法来分析雷达吸波材料涂层的矩形导电平板的电磁散射。
Experimental study on turbulent boundary layer pressure fluctuation frequency spectrum 湍流边界层压力起伏频谱特性研究
A concise second order absorbing boundary condition in frequency domain 一种简明的频域二阶吸收边界条件
In this paper, boundary volue method is used for dynamic analysis of towering structures. The boundary volue equation and the frequency equation of dynamic analysis have been derived and a set regularized program of the calculation has been set up for calculating eigenvalues and eigenvectors. 本文将结构分析的边值法[1]用于高耸结构动力分析,导出了动力分析的边值法方程和频率方程,建立了一套求频率和振型的程序。
Chinese Name Recognition Based on Boundary Templates and Local Frequency 边界模板和局部统计相结合的中国人名识别
The three-dimensional finite difference approximation of Mur's absorbing boundary condition is presented in frequency domain. With the discrete formulation of Maxwell's equation for finite difference frequency domain, it is convenient to solve three-dimensional electromagnetic scattering problem. 本文构造了三维Mur二阶吸收边界条件的频域差分离散格式,结合Maxwell方程组频域有限差分方程,可方便地分析三维电磁问题。
In this paper a concrete practical soil-structure interaction problem-calculation of dynamic stiffness coefficients of foundation is solved with the finite element-local transmitting boundary method in frequency domain. 本文采用有限元-局部透射边界方法在频域内求解了土与结构相互作用问题中的一个具体实用问题:地基动力刚度系数的计算。
There exists the recrystallization cube texture with high orientation intensity in the sample recovered and then annealed at lower temperature, and the ∑ 7 grain boundary occurs with high frequency which corresponds to the sharp cube texture component and S texture component. 高强度的再结晶立方织构和一定强度的S织构共存的样品,∑7重位晶界具有较高的出现频度。
The formulas from an interface relaxation equation for the calculation of specific relaxation time and capacitance dispersion frequency are related to the electrophysics parameters of the grain and grain boundary. The calculations of dispersion frequency are coinciding with the measure values qualitatively. 界面驰豫方程确定的特征驰豫时间和电容弥散频率计算式,与晶粒和晶界的电物理参数相关,弥散频率的计算值与实验结果定性相符。
Construction of the Absorbing Boundary Conditions in Frequency Domain 频域吸收边界条件的构造理论
We acquire simplified formula of boundary condition for vibration calculation after analyzing boundary sensitivity factors influencing modal frequency value. 通过对桅杆边界条件敏感因素分析,得出边界条件计算的简化公式。
In order to take account of the influence of boundary condition to vibration frequency and vibration shape, a beam model with spring_mass boundary is adopted. 采用边界为弹簧-集中质量梁模型,考虑梁振动时边界条件对频率与振型的影响。
Application of Two-dimensional Boundary Element Method to Resonant Frequency Problem of Accelerator Cavity 应用二维边界元法计算加速器谐振腔的谐振频率
In features extraction step, system extracts four eigenvalues like high/ low frequency energy, color saturation energy and average boundary flicker frequency. The eigenvalues were based on the semitransparent and flickering characters of smoke. 在特征提取环节中,根据烟雾的半透明性和闪烁频率两种特性系统提取了可疑图元的高低频能量,颜色饱和度能量和边界平均闪烁频率四种特征值。
The optimal rotational component is presented for element lumped mass matrix of Euler beam element corresponding to different boundary conditions. More accurate natural frequency of vibration can be obtained through the presented lumped mass matrix. 考虑不同的边界条件,给出了欧拉梁单元集中质量矩阵转角项的最优值,算例结果表明利用本文给出的建议值可以得到较为准确的自振频率。