查询词典 harmonic wave

According to the frequency-domain convolution theorem, we can prove the peak frequency and phase are frequency and phase of the harmonic wave signal.

根据频域卷积定理证明最大峰值点的频率和相位就是信号的实际频率和相位，依据由卷积关系得出的关于幅值的方程求出校正幅值。

The GKS stability theorem for one-dimensional model of hyperbolic initial and boundary value problem, Trefethen's explanation and extension based on the concept of group velocity are generalized firstly. Another possible high-frequency instability mechanism in numerical realization of MTF is pointed out based on his explanation and extension, namely, coupling effect of outgoing harmonic wave along one direction and node motion in the other directions can reverse the energy propagation in multi-dimensional discrete grids.

本文概述了—维双曲型偏微分方程组初边值问题数值稳定性的GKS定理及Trefethen基于群速度概念对这一定理的解释和推广；并应用Trefethen的解释和推广指出了MTF在数值实现中可能出现的另一种高频失稳机制，即在多维离散网格中，沿某一空间方向的外行简谐波，由于与其他空间方向节点运动的耦合效应可以使能量传播方向反向。

The dispersivity of wave propagation implies that phase velocity of a single harmonic wave is a function of the angle frequency.

本论文基于上述耦合模型，对单轴应变一维情况讨论了非线性饱和-非饱和多孔介质中波传播过程的失稳现象和逸散性。

With the filling nitrogen of 0.9 MPa, the maximal pressure ratio reaches 1.21 and the operation frequency is 25 Hz. The ratio of the harmonic wave of the engine was very little and the frequency jumping was not found in present experiments.

在充气压力为0.9MPa的条件下，该热声发动机最大压比可达1.21，远高于驻波型热声发动机，实验结果和理论分析均表明系统的工作频率为25Hz左右，实验装置的谐波比例非常小，且也没发现频率跳变等现象。

Application of wavelet filter in harmonic wave detection of power system.

小波滤波器在电力系统谐波检测中的应用。

According to longitudinal vibration partial differential equation of rod, the longitudinal vibration displacement response of uniform infinite rods by the harmonic point forces was derived.

longitudinal vibration ； wave approach ；从杆纵向振动的偏微分方程出发，推导了无限长杆在简谐点力作用下的纵向振动位移响应，在此基础上，基于结构线性假设和波的叠加原理，得出了有限长梁纵向振动谐响应的波动表达式，列出了常用的边界条件。

Supposition of two vibrations with same frequency and direction, condition generated mechanical wave, dynamic equation of plane harmonic wave.

同方相同频率的两个简谐振动的合成；机械波产生的条件；平面简谐行波的运动学方程。

Week 4 Supposition of two vibrations with same frequency and direction, condition generated mechanical wave, dynamic equation of plane harmonic wave.

第4周 同方相同频率的两个简谐振动的合成；机械波产生的条件；平面简谐行波的运动学方程。

Output current is sine wave and does not include unnecessary high harmonic wave.

输出电流为正弦波，不包括多余的高次谐波。

In this paper, we use Fourier transformation to analyse the spectrum of the finite-length harmonic wave train, and point out that the relationship between frequency width and continuance of a wave train obeys the indeterminate relation in quantum mechanics.

本文应用富里哀变换对有限长简谐波列进行了频谱分析，指出波列频宽与持续时间之间服从量子力学的测不准关系。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。