直升机

Aimed at rapidity and low power consumption required by intelligent mines,based on correlation theory and pattern recognition technology,a new method is given,in which helicopter noise signal of time domain is analyzed directly,that is to estimate fundamental frequency by calculating self-correlation function,then recognize target thinking of the fundamental frequency as characteristic quantity.

预警识别是被动声探测的关键技术之一，其作用是探测环境噪声信号作为预警信号，当直升机或其它目标出现时，传声器检测到的声能首先被转化为一定幅度的电压信号，电路通过判断信号的大小和其它特征来确定是否出现直升机目标。

"OU"–Helipad for emergency and other government flying services.

其他指定用途」注明「直升机升降坪」–直升机坪提供紧急和其他政府飞行服务。

The Harrier can fly as fast as a jet airplane. It also can take off and land the way a helicopter can.

鹞式战斗机兼具喷气式飞机与直升机二者的优势：它的飞行速度与喷气式飞机一样迅猛，它还可以像直升机一样垂直起飞和降落。

The effects of ground on trimming and maneuvering control were studied.Taking a typical helicopter as an example,the trims for steady flight with different velocities and altitudes were first solved.Then control laws for lateral jink maneuver were obtained for helicopter NOE flight.The calculation results conform to the ground effect theory,and load factor and control variation of the maneuver can be used for reference.

以某直升机为算例，在近地飞行和考虑不同速度与高度时，分别进行了直升机稳定飞行时的配平计算，然后以侧向紧急转弯机动为例，对机动操纵规律的问题进行了计算分析，计算结果与地面效应的理论相符合，机动过载和操纵变化规律可以为飞行试验提供借鉴。

"Kazan Helicopters" is one of the largest helicopter producers.

卡赞直升机公司是世界上最大的直升机制造商之一。

Troy Brown said the Black Hawk helicopter was in the air for nearly three hours, and the Kiowa helicopter was airborne for about one hour.

特洛伊上尉布朗说，黑鹰直升机在空中近3个小时，而基奥瓦直升机约一小时空中。

In order to develop the passive acoustic intelligent mines for antihelicopter and anti-tank, this thesis systematically investigates the passive localization principle of acoustic array and some methods for tracking helicopters and tanks.

为反直升机、反坦克被动声探测智能地雷研制的需要，本文系统地探讨和分析了智能地雷被动声阵列定位原理，研究了智能地雷实现直升机、坦克目标定位的滤波、跟踪技术。

In the 15-second long video, a student in uniform gets off a white helicopter landing at the playfield of a school.

在这段15秒长视频中，一架白色直升机停在一所学校的操场上，从直升机上走下来一个穿校服的学生，直升机随后飞走。

This paper studies optimal helicopter flight operations in the event one-engine failure. A three-dimensional point mass with a yawing motion of UH-60A has been used to study RTO and CTO from an elevated heliport or from a heliport, A first order dynamic of the OEI contingency power is considered. Flight after engine failure are formulated as nonlinear optimal control problems.

双发及多发直升机单发失效后，直升机飞行所需要的功率由剩余发动机提供，而在某些需要大功率的飞行状态时，如起飞状态、着陆状态等，剩余发动机提供的功率可能满足不了，这就需要对剩余发动机的可用功率进行合理利用。

CH-53D is designed to transport personnel, supplies and equipment in support of amphibious and shore operations, equipped with two General Electric T64-GE-413 turboshaft engines, 3,925 shaft horsepower each.

CH-53"海上种马"中型运输直升机是美海军直升机部队的重要组成部分，承担大量的两栖运输任务。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。