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此外，由于不用空气螺旋桨驱动，所以噪音也比较小。Moreover, they are also quieter, as they are not driven by an airscrew.

空气螺旋包括螺旋桨、风车、风扇和直升机叶片等。The airscrew included various propellers, fans, windmills and helicopter blades, etc.

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达？芬奇还有一个可行的想法，即根据空气动力学的原理设计出一螺旋桨来驱动的直升飞机。His one workable idea was the propeller-driven helicopter designed around the airscrew principle.

早在公元前400年，中国人就在儿童玩具中使用了这种空气动力学的原理。As far back as 400B. C. , the Chinese were using the airscrew principle in building children's toys.

本文就是针对合作单位要求，研制了直升机旋翼负载模拟系统。Aiming at the demand of design, this paper analyses the helicopter airscrew electro-hydraulic servo loading system.

初教-6串列双座螺旋桨教练机，长期服役于我国空军及地方航校，至今仍然是我国初级教练机的主力。CJ-6 airscrew primary trainer, deployed in PLA airforce and civilian pilot training center for very long time, is still the main primary trainer of China.

论文结合实际的工程项目，以某型号直升机旋翼气动载荷模拟为研究内容，对加载系统的组成、系统数学模型进行分析和研究。In this thesis, the aerodynamic load simulation of one type of helicopter airscrew is studied, and the system's structure and its mathematic model are analyzed.

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直升机的半实物仿真试验室中模拟旋翼在飞行中所受空气动力载荷的重要设备是负载模拟器。In the helicopter's half-practicality simulation laboratory, load simulator is an important equipment to simulate the aerodynamic load acting on the airscrew while flying.

论文首先介绍了直升机旋翼加载系统的结构，在建立了单通道加载系统的数学模型的基础上，分析了加载系统的动念性能。First, the structure of helicopter airscrew loading system was introduced, On the basis of single channel loading system's math model, the system's dynamic performance was analyzed.

该论文先介绍了螺旋桨驱动电机的工作原理，分析了无刷直流电机转矩脉动产生的原因及消除或抑制方法。The work principle of the motor driving airscrew is presented in the dissertation. The reasons and the method of elimination or suppression of torque pulses produced by BLDCM are analyzed.