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。
The transmitting boundary in time domain has been applied to frequency domain.
本文将时域透射边界应用于频域。
Accuracy of the boundary in frequency do, main is first discussed and demonstrated in terms of one dimensional model of wave motion.
首先讨论了频域透射边界的精度，并用一维波动模型详细论证了它的精度和可行性。
Mechanism of the oscillation instability is then illuminated in frequency domain by amplification at the artificial boundary and multi-reflection of wave motion in a finite discrete model.
根据波在人工边界的放大效应和在有限离散模型中多次反射的概念在频域内阐明了这一常见的振荡失稳的机制。
The weak intonation is shown in the following features: low fundamental frequency, narrow pitch range, and the rising of boundary tone.
祈使句语气的弱化通常体现在以下几个方面：降低基频、缩小基频范围、以及抬高边界调。
From these dynamic solutions, frequency and mode shapes of sectorial plate and sectorial annular plate under boundary conditions of GSS and GRS are derived.
由动力学的一般解，导出了扇形板和扇形环板在广义弹性简支和广义刚性滑动边界条件下自由振动的频率方程和振型；
Emphasis in the discussion is put on presentation of finite element method in frequency domain, in which transmitting boundary has been adopted.
文中重点讨论了具有工程实用价值的引入了透射边界的频域有限元解法。
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, a coupling model of Beam element finite element boundary element Infinite boundary element for the analysis of structure foundation system in frequency domain is established.
采用梁单元、有限元、边界元、无限边界元相结合的方法，建立了频域中结构-半无限地基系统的分析模型。
According to the elastic thin plate theory and vibration theory, a boundary element method (BEM) was used to analyze the frequency characteristics of a thin plate in lateral free vibration.
根据弹性薄板理论和振动理论，运用边界元法(BEM)分析了薄板弯曲自由振动的频率特性。
The value of the boundary at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population.
四分位值在被分成四部分频数分布中位于25，50或75点的边界值，每部分包含四分之一人口。
The torsional vibration equation can be solved exactly in every segment, then the natural frequency is given by using continuous conditions and boundary conditions.
每一段的扭振方程可精确求出，然后，根据边界条件和连续条件可将扭振固有频率计算出来。
The boundary conditions has strong influence on the coupling effect, the stronger it is, the smaller frequency of free vibration is but the larger amplitude is.
边界条件对耦合效应有较大的影响，较强的边界条件使椭圆板热弹耦合自由振动的频率变低，但振荡幅度增大。
We propose a numerical method using boundary element to model the electromagnetic filed induced by artificial source in the frequency domain with 3-D topography.
提出了一种用边界元法计算频率域人工源三维地形电磁场的数值模拟方法。
Taking into account the boundary conditions, two results were gotten: 1) The nonlinear medium provides gain to small ripples which is beyond the Bespalov-talanov cutoff spatial frequency;
而考虑边界条件以后，出现了这样两个特征：在B-T理论截止频率以外的一些小纹波依然有一定的增益；
The stability of the algorithm is analyzed by method in frequency domain, and the stable boundary of robustness is given. The effectiveness of this algorithm is verified by simulation.
过程的动态特性用传递函数加纯滞后描述，用频域法分析了算法的稳定性，并给出了鲁棒稳定界，仿真验证了算法的有效性。
The vibrational modes and spectrum are very different if the free boundary condition is adopted, and the spectrum is divided into low, medium and high frequency branches.
若采用自由边界条件，则模花样和振动频谱完全不同，这时只能分为低频支、中频支和高频支。
In this paper, the boundary point method (BPM) is applied to the study of the non unique solution at characteristic frequency for exterior acoustic radiation caused by vibrating body.
文章利用边界点法，对振动体外部声辐射在特征频率处解的非唯一性问题进行了研究。
In polycrystalline samples, the intermediate-frequency mechanism is interpreted as the grain-boundary conduction mechanism.
而矿物多晶中间频率段的导电机制由颗粒边界所引起。
The vertical structures of temperature and wind in the boundary layer also have an effect on the vertical distribution of low-frequency spectra of horizontal wind velocity.
边界层温度和风速的垂直结构也会影响到水平风速低频谱的垂直分布。
By this Method, the natural frequency of revolution with geomeric axisymmetric imperfections was computed for two kinds of boundary conditions: one is fixed, the other is elastically supported.
计算中考虑了两种边界条件：一种是固定支承的；一种是弹性支承的。
Through numerical calculation, we get the frequency spectrum of one-dimensional diatomic chain in free and periodic boundary conditions.
通过数值计算，我们得到一维双原子链在自由边界与循环边界条件下的频谱。
Local artifical boundary condition in time domain is based on concept of travelingwave. It cannot simulate zero-frequency component(evanescent motion) generally.
时域局部人工边界是以行波概念为基础的，原则上不能用于模拟零频分量（消减运动）。
Two test methods, both test on boundary scan and test-by-divider, are described in details, especially focusing on the maximum output frequency, the range of output frequency and the time to lock.
分别给出了边界扫描测试和分频器测试两种测试方案，并对两种方案进行了比较，指出了各自的适用范围。
Numerical results showed that the proposed boundary could simulate the influence of far field and did not have the problem of low-frequency instability.
数值分析结果显示，该边界可较好地模拟远场介质的作用以及土体的辐射阻尼，具有良好的低频稳定性。
It is thought that the independent equation of the boundary relation in the frequency-domain is composed of two curl equations and the charged continuity equation of the boundary relation.
认为时域场的边值关系的独立性方程可以用两个叉乘方程，电荷连续性方程的边值关系和电磁场的初始条件来确定。
It is thought that the independent equation of the boundary relation in the frequency-domain is composed of two curl equations and the charged continuity equation of the boundary relation.
认为时域场的边值关系的独立性方程可以用两个叉乘方程，电荷连续性方程的边值关系和电磁场的初始条件来确定。
应用推荐