摘要:
Procédé de commande d'une section detuyère variable d'un aéronef L'invention concerne un procédé de commande d'une position de tuyère de section variable d'un aéronef dans lequel, au cours d'un vol, on autorise le déplacement de la tuyère dans une position optimale après une durée prédéterminée.
摘要:
A multi-pulse rocket is equipped with a thermally insulating barrier that serves as a rupture disk or a movable plug or plate separating staged propellant grains. When a rupture disk it used, the disk can be equipped with a pyrotechnic actuator to weaken the disk upon command, enabling the propellant grain on the fore side of the disk to burst the disk at a relatively low pressure when ignition of the propeiiant grain is needed for additional thrust. Rupturing of the disk can also be controlled by attitude maneuvering ports on the tore side of the barrier whose open or closed conditions are controlled by independently operable closures. When a movable plug is used, the plug is movable between a closed position separating rocket chamber into subchambers isolating the propellant grains from each other and an open position allowing the flow of combustion gas between the two subchambers.
摘要:
A nozzle arrangement for use in a gas thruster is presented. At least one heater micro structure (20) is arranged in a stagnation chamber (12) of the gas thruster. The heater microstructure (20) comprises a core of silicon or a silicon compound coated by a surface metal or metal compound coating. The heater microstructure (20) is manufactured in silicon or a silicon compound and covered by a surface metal coating. The heater microstructure (20) is mounted in the stagnation chamber (12) before or after the coverage of the surface metal or metal compound coating. The coverage is performed by heating the heater microstructure and flowing a gas comprising low quantities of a metal compound. The compound decomposes at the heated heater microstructure (20), forming the surface metal or metal compound coating. The same principles of coating can be used for repairing the heater microstructure (20) in situ. The driving gas comprises preferably a compound exhibiting an exothermic reaction when coming into contact with a catalytically active material. If the gas is exposed to heater microstructures being covered with the catalytically active material, the gas is further heated by the catalytic reaction.
摘要:
A method and apparatus for thrust vectoring a flight vehicle during homing are disclosed. The flight vehicle includes a body; a plurality of attitude control mechanisms on the body; a multi-pulse motor housed at least partially in the body; and a control unit housed in the body. The control unit generates signals controlling an actuation of the attitude control mechanisms and the multi-pulse motor to initiate a follow-on burn of the multi-pulse motor to effect a maneuver directed by the actuation of the attitude control mechanisms. The method includes conserving a second burn of a dual pulse motor until target acquisition; acquiring a target; actuating a attitude control mechanism for the flight vehicle to alter the flight vehicle's heading; and initiating the second burn.
摘要:
According to the present invention, a method for multistage control of a flow control valve using a DC motor comprises a sleeve which is opened and closed according to the rotation of a DC motor such that a flow rate is adjusted. Provided is a method for multistage control of a flow control valve, wherein: in order to schedule, by stages, an angular speed value of a DC motor which is determined according to a driving voltage applied to said DC motor, an angular speed-limiting area of said DC motor, in accordance with each stage, is divided on the basis of a plurality of boundary values (SP1, SP2, SP3, SP4...); and the flow control valve is controlled such that the DC motor is rotated with a determined angular speed value according to an angular speed command (Sn) of the corresponding DC motor within one angular speed-limiting area, wherein if the angular speed value of the DC motor is out of the range of a boundary value (SPn) of the corresponding angular speed-limiting area, the flow control valve is controlled such that the DC motor is rotated with the determined angular speed value until the DC motor is out of the range of a boundary value (SPn+1) of the corresponding limiting area according to an angular speed command (Sn+1) of the corresponding DC motor within an angular speed-limiting area of a next stage.
摘要:
본 발명에 따르면, DC 모터의 회전에 따라 슬리브가 개폐되어 유량이 조절되는 DC 모터를 이용한 유량제어 밸브의 다단제어 방법에 있어서, 상기 DC 모터에 인가되는 구동전압에 따라 정해지는 DC 모터의 각속도값을 단계별로 스케줄링할 수 있도록 복수 개의 한계값(SP1, SP2, SP3, SP4...)을 기준으로 상기 DC 모터의 단계별 각속도 제한 영역을 구획하며, 하나의 각속도 제한 영역 내에서 해당하는 DC 모터의 각속도 지령(Sn)에 따라 DC 모터가 정해진 각속도값으로 회전하도록 제어하되, DC 모터의 각속도값이 해당 각속도 제한 영역의 한계값(SPn)을 벗어나게 되면, 다음 단계의 각속도 제한 영역 내에서 해당하는 DC 모터의 각속도 지령(Sn+1)에 따라 DC 모터가 해당 제한 영역의 한계값(SPn+1)을 벗어날 때까지 정해진 각속도값으로 회전하도록 제어하는 것을 특징으로 유량제어 밸브의 다단제어 방법이 제공된다.
摘要:
This propulsion system of a rocket motor assembly includes an array of attitude-control rocket engines, one or more oxidizer-fluid sources, one or more ignition-fluid sources, and, optionally, one or more primary rocket engines. Each of the attitude-control rocket engines has a respective combustion chamber and is offset from the longitudinal axis of the rocket motor assembly so that when a selected one or group of the attitude-control rocket engines is fired, the flight path of the assembly is diverted and/or the rocket assembly spins. The oxidizer-fluid and ignition-fluid sources are in operative communication with the attitude-control rocket engines to respectively permit oxidizer fluid and ignition fluid to be supplied to selected ones or groups of the attitude-control rocket engines. Optionally, a portion of the ignition fluid from the ignition-fluid source can be cooled and used to pressurize the oxidizer-fluid source.
摘要:
This invention discloses a fluid dynamic system including a fluid medium separated from a solid medium by a solid boundary, one of which media is moving with respect to the other, apparatus for controlling the motion of the moving medium, comprising, a perturbation-producing element at solid boundary, and a drive for cyclically driving the perturbation-producing element to produce cyclical fluid perturbations in the fluid medium sufficient to alter the motion of the moving medium. A method for including a fluid medium separated from a solid medium by a solid boundary in a fluid dynamic system is also disclosed.
摘要:
An impulse turbine system (10) includes a rotatably mounted turbine wheel (12) and a speed sensing system (40) to sense the speed of the turbine wheel (12). A flow diversion nozzle (14) normally provides a jet of driving fluid to power the turbine wheel (12). This nozzle (14) includes an internal flow diverter (30, 38, 58, 74, 76, 88, 90, 94, 104, 110, 118) which operates under the control of the speed sensing system (40) when the turbine wheel (12) reaches an overspeed condition to angularly divert the jet of driving fluid issuing from the nozzle opening (26).