查询词典 harmonics

Calls were found from sonograms to be very simple with more harmonics and with high note repeat. Songs are more complex.

同时发现其声谱图结构比较简单，表现出高度的音节重复并多有谐波的现象。

This deviation from perfect sinusoids is usually expressed in terms of harmonics distortion of the voltage and current waveforms.

这种偏离完全正弦的畸变称为电压、电流波形的谐波畸变。

This paper presents the carrier swapping method, this method not only can balance the DC current, but also can reduce the AC current harmonics. This paper introduces the principle of this method and gives the experimental results.

本文提出了载波轮换均流方法，此方法既可实现直流均流，又可降低交流谐波，本文介绍了其原理，给出了实验结果。

The principle of the novel single-phase hybrid active power filter is described in detail. Based on the above analysis, Kalman filtering approach for estimation of harmonics is presented to improve the speed and precision of harmonic detection, and it also can avoid the influence made by voltage distortion on harmonic detection. A new current control strategy based on energy balance is presented to regulate the active part absorbing or releasing active power and control the inverter to produce current opposite to the harmonic current reflowing in injection branch, the above method combined with harmonic current tracking control that keeps the stabilization of dc-side voltage and improve the reliability of the system.

并详细分析了系统的滤波原理，提出了基于卡尔曼增益自调整的改进型动态谐波含量估计方法，能够快速准确的跟踪检测电网谐波电流，并且克服了电力机车等冲击性负荷引起的电网电压畸变对谐波检测精度的影响；提出了基于逆变器两侧能量平衡的电流控制方法使有源部分吸收或释放一定有功或无功功率及产生与注入支路回灌谐波电流相反的抑制电流，然后联合电网谐波电流跟踪控制以获得系统参考信号，保证了直流侧电压的稳定，提高了装置可靠性，增强了系统滤波性能。

A tuned circuit in the plate is used to peak response, maximizing output and helping to suppress harmonics.

屏极所接的调谐回路作为发射配谐，使发射达到最大并能抑制谐波。

These results show that the choice of pole number and slot number has a significant effect on the performance and the proper choice of the pole-slot number combination and pole embrace can weaken the effect of output voltage harmonics and reduce usage of magnet material,as well as save cost,which are helpful to obtain the better performance.

结果表明：极槽匹配对直驱式风力永磁发电机性能有很大影响；通过合理选择极数、槽数以及极弧系数，可以减少输出电压谐波分量的影响，降低永磁材料的使用，节省成本，有助于直驱式风力永磁发电机获得良好的性能。

Application of smoothed pseudo Wigner-Ville distribution in detecting harmonics and short duration voltage variations.

平滑伪Wigner-Ville分布在电力系统谐波和电压变动检测中的应用。

The digital users signals comprising in-phase component and quadrature component are converted to analog baseband signals by digital-to-analog converters 104 and 114, which are followed by lowpass filters 106 and 116 for removing harmonics at unwanted frequencies.

包括同相分量和正交分量的数字用户信号通过数模转换器104和114转换成模拟基带信号，在数模转换器104和114的后面具有低通滤波器106和116，低通滤波器106和116用于去除在不期望频率处的谐波。

In Chapter 5 and 6, a suite of calculation method of branch model and their parameters, which can fully consider the effects of various spatial harmonics, is worked out. In the last chapter, the calculation method of the asynchronous starting characteristics of the new type machines at quasi-stationary state have been discussed in details.

第四章则针对变极凸极同步电机的特点，通过对其气隙磁场谐波性质及其作用的分析，得出了若干具有理论和实用价值的结论，在此基础上，第五、六两章则提出并建立了一套能够充分考虑各种性质空间谐波影响的支路模型及其参数计算方法。

Switching power supply ; line trap ; harmonics

开关电源；阻波器；谐波

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。