三角平台是干嘛的啊

1) double trigonomatry platform
双三角平台2) dual three-level
双三电平
1.The mathematical model of a dual three-level STATCOM which consists of two three-level inverters connected together through the inter-phase transformer is presented by means of the switching function concept.
利用开关函数的概念,建立了由2个三电平逆变器和1个输出耦合变压器构成的双三电平STATCOM的数学模型,并对其直流电压波形和交流侧输出电压和电流波形进行了仿真分析.仿真结果表明在工频方波调制方式下,通过合理选择电感和电容参数可获得谐波含量较小的电压和电流波形,从而可用低频大功率开关器件构成开关损耗尽可能小且对电网谐波污染小的高压大容量STATCOM装置.同时,所建立的数学模型及分析方法可推广应用于其它类似结构的电力电子电路的理论分析与仿真研究中3) double-delta wing
双三角翼
1.In order to increase the ceiling,enlarge the range and extend the endurance of a certain aircraft,double-delta wings are adopted so as to enhance the trainer capabilities and meet the operational requirement.
为了加大某型机航程、升限、延长留空时间,在原型机上采用双三角翼改进气动特性,以期提高该机性能,满足使用需求。
2.The vortex visualization and surface pressure distribution for a 75°/45°double-delta wing were carried out in the water tunnel and in the low speed wind tunnel of