首先，确定了四旋翼直升机的设计方案。
First, the project of four-rotor helicopter has been decided.
对采用电控旋翼直升机的配平及操纵特性进行了研究。
Research on the trim and control characters of the helicopter was conducted, which featured with the electrical controlled rotor (ECR).
以此为基础，建立了电控旋翼直升机的飞行动力学模型。
Then the flight dynamics model of the ECR helicopter was constructed.
某型共轴双旋翼直升机计算实例表明，所得结果与该型直升机飞行特性一致。
Calculation example given indicates that the equations of dynamic response proposed for vertical movement and direction rotation reflect flight characteristics of this helicopter.
萤火虫项目是一种单旋翼直升机，使用美国混合动力(US Hybrid)公司制造的电池。
It's a single rotor helicopter powered by batteries made by US Hybrid.
本文基于模态分析理论和试验技术，提出了一套测定纵列式旋翼直升机在起落架上的刚体模态特性试验方法。
A test method of measuring rigid modal behavior of column rotor helicopter on landing gear is suggested in this paper.
为了进行有关的实验，作者研制了一种基于SG3524和IGBT功率管PWM驱动电路，它是一种用于四旋翼直升机的PWM驱动电路。
Next, to conduct corresponding experiment, a kind of PWM drive circuit based on the SG3524 and the IGBT voltage regulator is developed, and it's a kind of PWM driven circuit for Quadrotor.
这意味着它能像直升机一样悬停，但向前飞时可能减少主旋翼的速度并让这两个短翼提供部分提升力。
This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift.
增加旋翼桨叶数量也是一种方法，这使得每片桨叶负载的直升机重量降低了，因此产生的噪音更小。
Then there's increasing the number of rotor blades. This helps because each additional blade carries less of the weight of the helicopter, and thus produces less noise.
Pilobolus剧团以吸收不同寻常的元素出名，不过最为新奇的恐怕要属这两个在乔伊斯舞台上为舞者MattDelRosario伴舞的四螺旋桨直升机（学名“四旋翼飞行器”）。
Pilobolus is known for dances that incorporate unusual elements. Few, though, have been stranger than the two four-rotored helicopters that accompanied Matt Del Rosario on the stage of the Joyce.
这意味着它能像一架直升机那样作空中悬停，而在向前飞行时，又能降低主旋翼的速度，因为它的一对短翼提供了部分升力。
This means it can hover like a helicopter, but when flying forward can reduce the speed of the main rotor because the wings provide part of the lift.
为了使直升机在尘土中安全地着陆需要复杂的激光扫描仪去探测被旋翼的倒灌气流扬起的灰尘所隐藏的障碍物。
To land a chopper safely in the dirt requires sophisticated laser scanners to detect obstacles hidden by dust thrown up by the downdraught of the rotors.
立方直升机的这种配置让他可以像直升机一样盘旋，但在向前飞行时，主旋翼的转速可以将下来，让两侧的机翼提供升力，在此情况下，两台螺旋桨推进器就能发挥大作用了。
This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift. Its propellers give the extra oomph.
V - 22由贝尔直升机公司研发，并同波音旋翼飞机系统部合作一起生产制造。
The V-22 was developed by Bell Helicopter, which manufactures it in partnership with Boeing Rotorcraft Systems.
直升机与其他航空飞行器最本质的区别就在于它的旋翼系统。
Helicopters and other air craft the most essential distinction lies in its tilt-rotor system.
这架代号为GEN H - 4的直升机有两个向相反方向旋转的旋翼，最高飞行速度可达每小时50公里。
The helicopter, named GEN H-4, has a set of two rotors turning in opposite directions and can fly at a maximum speed of 50 kilometres (31 miles) per hour.
一旦旋翼大小固定，几乎决定了空气推进速度(如果你知道直升机重量)。
Once you set the rotor size, you pretty much have determined the thrust air speed (if you know the mass of the helicopter).
智能旋翼技术是目前直升机界的研究热点。
The smart rotor technology is the present hotspot in the helicopter world.
直升机旋翼既要提供升力又要提供向前的推力是造成这一情况的主要原因，同时旋翼产生的震动也是一个让直升机飞不能高速飞行的部分原因。
That is partly because of increasing vibration, but mainly because the spinning rotor blades provide both lift and propulsion.
飞行中的飞机以外的悬停控制叶片被用来创造一个倾斜力向量机在希望的方向就像直升机旋翼。
To fly the aircraft in anything other than a hover the control vanes are used to create a force vector to tilt the machine in the desired direction much like a Helicopter rotor.
应用该方法建立了直升机旋翼自转着陆过程的仿真模型，给出了全量模型和模型调整过程。
The simulation model for landing process of a helicopter with rotator self-rotating is built with the proposed method. The whole model and model tuning method are also given.
CV - 22非常特别的一点是它的倾转旋翼，它既可以作为直升机也可以作为飞机使用。
A unique feature of the CV-22 is that its rotors tilt so that it can act either as a helicopter or a plane.
本文详细介绍直升机旋翼实验台实时监视报警系统的功能，硬件配置以及软件设计方法。
This paper mainly introduces the function, the hardware and software of the monitoring system of the helicopter rotor testing device.
提出了一种在模型直升机旋翼故障试验台上模拟减摆器失效故障方法。
This paper presents a simulation method of the defective lag damper fault on a helicopter rotor test rig.
介绍了某直升机旋翼试验台的振动数据采集和预处理系统的设计和组成。
The design and the construction of a data acquisition and preprocessing system for a helicopter rotor test rig are described.
研究表明，本方法适用于转子动力学，直升机旋翼-机身耦合系统以及具有流体流动的管道系统的动力分析。
Research shows that, it is suitable for rotor dynamics, dynamic analysis of helicopter rotor blades fuselage systems and piping systems contained flow fluid.
试验研究了直升机机身受旋翼气流干扰时的空气动力特性。
The interaction effects of rotor wake on fuselage for helicopter were researched with experimental method.
四旋翼无人直升机由于其飞行控制相对容易，安全性也得到了较大的改善，越来越受到研究人员的关注。
Because the flight control of four-rotor unmanned helicopter is relatively easy and its security has been improved greatly, it is paid more attention by researchers.
四旋翼无人直升机由于其飞行控制相对容易，安全性也得到了较大的改善，越来越受到研究人员的关注。
Because the flight control of four-rotor unmanned helicopter is relatively easy and its security has been improved greatly, it is paid more attention by researchers.
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