1) two frequencies-frequency conversion generator
双频变频发电机
2) dual frequency
双频
1.
Design of the reflector shape for dual frequency base-station antennas;
双频基站天线中的反射板形状设计
2.
On the basis of different behaviors of alternative electromagnetic field for induction and electromagnetic shaping, the process of dual frequency electromagnetic shaping of molten metal was firstly presented.
从固态金属感应加热熔化和液态金属电磁成形两个角度出发 ,讨论了金属熔体双频电磁成形中的频率选择 ,物理量的分布以及两种双频电磁成形的试验过程。
3.
On the basis of the theory of electromagnetic shaping, the concept of dual frequency electromagnetic shaping of liquid metal was presented, which mean that the one frequency electromagnetic field is used to melt the solid metal above its melt temperature and the other frequency electromagnetic field is used to make the liquid metal to a final shape.
对液态金属电磁成形的物理和数学模型进行了分析 ,提出了双频电磁成形的方法 (利用两种频率的电磁场实现固态金属无接触加热熔化和熔化后的金属无模壳电磁成形 )和原理。
3) dual-frequency
双频
1.
Design of mutimode & dual-frequency microwave sintering furnace;
多模腔双频微波烧结炉的设计
2.
Novel Design of an H-shaped Dual-frequency Microstrip Antenna;
新型h形双频微带天线的设计
3.
Design of Dual-frequency and Dual-circular-polarization Microstrip Antenna;
双频双圆极化微带天线实验设计
4) double-frequency
双频
1.
Analysis and inspection of double-frequency clock use in Linux kernel;
Linux内核采用双频时钟的分析及检验
2.
There are few ultrasonic generators for sludge treatment specifically, so we designed a double-frequency ultrasonic generating trough which could adjust frequency, energy density and treating time flexibly.
同时,单频超声波处理后污泥的厌氧产气累积增量高于双频超声波,为40。
5) dual-band
双频
1.
Design of dual-band circularly polarized annular slot antenna for wireless local area network applications;
无线局域网的双频圆极化圆环缝隙天线设计
2.
Design and simulation of novel dual-band microstrip antenna;
一种新型双频微带天线的设计与仿真
3.
Design of a Dual-band Dual-Polarization Stacked Microstrip Patch Antenna;
一种双频双圆极化层叠结构微带天线的设计
6) double frequency
双频
1.
Hardware design of double frequency wireless sensor network node;
双频无线传感器网络节点硬件结构设计
2.
A novel three-phase power factor correction with double frequency is proposed in this paper.
文中提出了一种新型的双频三相全桥功率因数校正器拓扑结构。
3.
real time,high precision,long distance measurement method by double frequency ultrasound is presented in this article.
本文介绍了一种在空气中实时、高精度、大范围双频超声波测距的原理及方法。
参考词条
补充资料：发电厂给煤机变频调速系统
发电厂给煤机是电厂制粉系统中重要组成部分，是电厂重要的辅助动力设备，其主要任务是为制粉系统磨煤机提供原料。
制粉系统工艺流程图
系统功能框图
根据给煤机稳定运行的重要性，采用冗余控制系统。
变频调速系统电气回路图
电气回路由空气开关、接触器、中间继电器、电流互感器、端子排、电缆等组成。变频器用双回路电源供电，当一路电源工作，则另一路电源作备用电源处于热备用状态，当工作电源失电或发生故障时，自动投入备用电源。
优点：实现软启动，启动电流小且平稳，减少对电网和设备的冲击。能连续无级调节给煤机的速度。给煤机长期运行在30Hz，节约能源。具有多种保护功能，易于维护、维修，符合工厂自动化发展趋势。
根据给煤机稳定运行的重要性，采用冗余控制系统。
电气回路由空气开关、接触器、中间继电器、电流互感器、端子排、电缆等组成。变频器用双回路电源供电，当一路电源工作，则另一路电源作备用电源处于热备用状态，当工作电源失电或发生故障时，自动投入备用电源。
优点：实现软启动，启动电流小且平稳，减少对电网和设备的冲击。能连续无级调节给煤机的速度。给煤机长期运行在30Hz，节约能源。具有多种保护功能，易于维护、维修，符合工厂自动化发展趋势。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。