层叠法

并在实验室条件下搭建了实验平台，该平台以载波三角波层叠法为控制策略，运用了数字信号处理器（DSP）和可编程逻辑器件（FPGA）相结合的控制电路。

And under laboratory conditions to build an experimental platform , the platform to the carrier triangular wave cascade method for the control strategy , the use of a digital signal processor ( DSP ) and programmable logic devices ( FPGA ) combination of the control circuit .

然后，在逆变环节采用中点钳位型三电平逆变器，分别对其采用三角载波层叠法和空间矢量法进行控制。

Thirdly , neutral point clamped three level inverter realizes the voltage transformation with triangular carrier method and space vector control .

层叠堆焊法在大型零件修复上的应用

Application of Overlaying-welding Process to Repair of Large-sized Component

实践证明，层叠堆焊法对大型机械零件修复是一种有效方法。

Relevant operation practice shows that the overlaying-welding process is an effective approach to repair of large-sized mechanical component .

以拟建的大跨结构为例，运用有限元方法分析了无比钢结构实现大跨结构的两种方法：直接法、层叠桁架法，并分析了两种方法的经济性；

Then take a big span structure for example , analyzing two means & direct truss and cascade truss to realize span integra structure .

1-3型采用层叠-浸渍法和切割-填充法；

1-3 composites by stacking dipping and cutting filling methods ;