谐振

A novel hybrid active power filterwith series resonance circuit turned at fundamental frequency is proposed,which is composed of high-capacity passive power filtersfor harmonic currents suppression as well as reactive power compensation and an active power filterfor improving filtering performance as well as overcoming resonance problem due to PPFs.

提出一种基波串联谐振式混合型有源滤波器，利用大容量无源滤波器实现谐波抑制和无功补偿；采用有源滤波器改善系统滤波效果并阻尼无源滤波器与系统阻抗之间的串、并联谐振。

In order to avoid the analysis difficulties of DBD circuit in time domain method, a new fundamental wave analysis method of DBD circuit is presented since the current of inverter is closed to sinusoidal wave.

3为降低时域分析方法的复杂和烦琐，本文利用串联谐振电路工作时电流接近正弦波这一特性，提出了串联负载谐振式DBD电路的基波分析方法，推导了DBD电源中主要电气量的表达式。

The Coupled resonator model and the distribution of the electric Field on the axisin the singly periodic cavity chain and biperiodic chain with full-cavity terminationsare analysed by Helmholtz Equation using the symmetry properties of the structure.

本文从场的对称特性来解析整腔结束的单周期和双周期谐振腔链的振荡模式，并给出它们的场分布，作为对用等效电路理论研究谐振腔链的振荡模式和场分布的另一校核方法。

In the process of ultrasonic vibration cutting, the resonant frequency of mechanical syntonic system varies in a wide range because of system's heating up and variable loads.

在超声振动切削中，由于系统的发热及加工负载的变化，机械谐振系统的谐振频率会在较大范围内发生变化。

Simulation results of winding current wave under different frequencies show that much harmonic is generated in the winding currents because of the gap variation, and an enough amplitude of vibration can be obtained near the syntony point.

对不同频率下绕组电流波形的仿真结果表明，在发生谐振的时候，系统气隙的周期变化会在电流中产生很多谐波，并在谐振点附近可以获得足够的振幅。

The theory of QRMT is that exogenous physical resonance of the music sympathizes with endogenesis biological resonance of the body, supplying body with weightily undertone vibration energy of 16-150HZ , and through syntony process, activating biological activity and producing the same frequency syntony effect with every organ.

量子波动共振音乐治疗主要是让音乐的「外源性物理振动」与人体的「内源性生物振动」产生共鸣，给予人体16-150HZ 的重低音频振动能量，透过谐振激发生物的本来活性，便可以与人体器官产生同频谐振的作用。

A method for analytical calculation of the resonance length for ultrasonic torsional fatigue samples is recommended. The angular displacement amplitude and torsional stress/strain amplitude on the surface of samples are derived.

介绍了一种超声疲劳扭转试样谐振长度解析计算方法，并给出了扭转谐振状态下试样表面的角位移和应力应变分布函数。

The proposed inverter has a new auxiliary resonant commutation cell. It provides that all main switching power devices in the soft-switching inverter operate at zero-voltage-switching turned-on and the auxiliary switches operate at zero-current-switching turned-off. In addition, this thesis presents an improved control scheme to minimize the operation of auxiliary resonant circuit for efficiency improvement.

所研制之柔切式数位变流器，系利用新型辅助谐振单元，使主功率开关操作於零电压切换，辅助开关操作於零电流切换，在此也提出改善之控制方案，以避免多余的辅助开关切换，因此能有效降低谐振电流所造成的额外导通损失，以提升系统之效率。

Compared with the previous circuit, the current of the main switch is decreased and the converter losses are reduced because of the soft-switch; adjusting the turns ratio of the auxiliary winding can decrease the voltage of the rectifier.

应用于推挽正激电路[6，7]的软开关电路拓扑通常是考虑在其整流桥之后增加一个辅助谐振网络，利用谐振电容上的电压来封锁整流桥，从而达到零电流关断主管的目的。

The operation condition of a series-resonant converter is equivalently analyzed under open-loop condition. OCC condition and selection basis of resonant parameter and switching frequency are determined. The relationships between LED number, transformer turns ratio and constant current error are also determined, which provide scientific basis for the selection of LED number and transformer turns ratio.

文中通过对串联谐振变换器开环工作状态的等效分析，确定开环恒流条件和谐振参数与开关频率的选择依据，以及LED数目、变压器变比与恒流误差之间的关系，为LED数目及变压器变比的优化选择奠定了理论基础。

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。