76 results about "Foreign object damage" patented technology

A nacelle for housing a gas turbine engine is disclosed. The nacelle comprises an inlet lip defining a leading edge of the nacelle and a conduit located within the inlet lip, the conduit having a fluid circulating therein. The fluid provides a heat source. An energy attenuating member is located within the inlet lip between the leading edge and the conduit. The energy attenuating member provides protection to the conduit from foreign object damage and is thermally conductive such that heat transfer communication between the conduit and the leading edge is provided.

The present invention relates to systems and methods for real-time health monitoring of engines to monitor turbomachinery blades during engine operation and report anomalous behavior and shape of the blades if it occurs, such as damage by FOD. The system comprises sensor(s) for obtaining a blade reflection profile from a blade passing by the sensor(s) during a revolution of the rotor in combination with a processor for performing timing calculations and/or fingerprint comparisons with reference data to identify a change in blade fingerprint relative to the reference data, which may indicate blade damage. Such systems can reduce operational costs, enhance safety and improve operational readiness by facilitating condition-based maintenance of engine rotors as opposed to schedule-based solutions. The invention can prevent the needless loss of life and assets caused by undetected minor levels of blade damage that may lead to unexpected catastrophic failure of an engine.

A foreign object damage protection system comprises a sensor for detecting a foreign object, a fluid in a reservoir, a means for dispensing the fluid, the means for dispensing the fluid in communication with the reservoir, and a control unit, whereby when the sensor detects a foreign object, the control unit causes fluid to be dispensed from the reservoir through the means for dispensing and towards the foreign object. The sensor is attachable to one or more locations on an aircraft, such as a wing, nose, windshield, fuselage or tail. The sensor can be a radar sensor, weather radar sensor, weather radar sensor modified to detect objects at short ranges, infra-red sensor, forward-looking infrared sensor, a light detection and ranging sensor, motion sensor, thermal sensor, or video sensor. The system provides a way to protect an aircraft from striking foreign objects, such as birds, in the path of the aircraft.

The invention relates to a method for evaluating the FOD resistance of an aero-engine blade. The method comprises steps of carrying out impact dynamics simulation of foreign object damage on a simulated blade numerical model; obtaining the relation between the macroscopic characteristics of the notch and the foreign object type, the impact speed and the impact angle, determining foreign object damage test conditions on the basis of the relation, carrying out an external simulated object damage test on the simulated blade by using an air cannon, and observing the macroscopic characteristics ofthe impact notch; Taking the static stress and the dynamic stress under the working load at the dangerous position of the front edge of the blade as the initial static load and the dynamic load of thehigh-cycle fatigue test, carrying out the high-cycle fatigue test on the damaged simulated blade, obtaining the high-cycle fatigue strength of the blade through a stepping method, and evaluating theFOD resistance of the blade according to the result of the high-cycle fatigue test; And carrying out foreign object damage simulation and high-cycle fatigue test on a small number of real blades to obtain the high-cycle fatigue strength of the real blades so as to verify the conformity of the simulated blades and the real blade test result.

Apparatuses and methods for preventing foreign object damage (FOD) to aircraft engines are disclosed. In one embodiment, a deployable blocker is coupled to a wing portion and/or a fuselage portion of the aircraft and is configured to prevent debris from travelling on a direct trajectory from a landing gear wheel to an engine air inlet. In other embodiments, the blocker can prevent debris from bouncing off the wing lower surface into the engine inlet, or sticking to the wing lower surface and falling into the engine inlet. The deployable blocker can cover at least a portion of the landing gear when the landing gear is retracted and the blocker assembly stowed. In another embodiment, the blocker can be mounted to the landing gear.

A device for protecting aircraft equipment against contact by a foreign object including an interference arrangement disposed in an air inlet upstream from the aircraft equipment where the interference arrangement is configured to physically obstruct passage of the foreign object within the air inlet.

An aircraft designed to prevent foreign object damage to the aircraft. The aircraft includes an engine coupled aft of the aircraft's landing gear, and a deflecting member is coupled to the aircraft between the landing gear and an inlet of the engine so that when the deflecting member is extended, it intersects with a portion of lines of sight between the landing gear and an inlet of the engine.

A crossfire tube for attachment between casing bosses of combustors includes a bellows assembly having a bellows with opposite cylindrical ends welded to annular flanges. The annular flanges include a bolt circle for securing the flanges to the combustor bosses. The flanges bear against a gasket for sealing against inserts welded to the casing bosses for retrofit in the sealing assembly to combustors or to seats where the inserts and bosses are formed integrally during original equipment manufacture. A telescoping cylindrical sleeve surrounds the bellows to protect from falling foreign object damage.

The invention relates to an airport runway foreign object damage detection system which comprises a terminal and at least one light emitting device and at least one camera device connected to the terminal. Each light emitting device is arranged at one side of a runway and is used for emitting near infrared light to illuminate the runway to generate light spots, and a projection of a foreign object is generated when the foreign object exists on the runway covered by the light spots. Each camera device is arranged at the other side of the runway and is used for shooting the light spots on the runway to obtain an image of the light spots. The terminal is used for processing the image, obtaining position information of the foreign object when the projection of the foreign object in the image is detected, and carrying out alarming. The invention provides the airport runway foreign object damage detection system, the identification of a micro foreign object is facilitated, the sensitivity of monitoring is improved, the automatic identification of FOD is realized, problems of low accuracy and low efficiency of artificial identification of FOD are avoided, and the projection of the foreign object can be quickly and accurately captured even under a strong sunlight background or in a condition of low visibility and water or oil on the runway.

The invention discloses a method and a system for damage repair of a tube plate and a caulk weld of a steam generator of a nuclear power station, and solves the technical problem that a conventional SG site repair technology cannot completely eliminate the influence of foreign object damage on SG. The method comprises the following steps: S1, conducting foreign object damage inspection on the tube plate and the caulk weld to obtain damage inspection data; S2, calculating the damage inspection data to obtain damage calculation data of the tube plate and the caulk weld; S3, conducting damage repair on the tube plate and the caulk weld based on the damage calculation data; and S4, after damage repair is finished, conducting repair inspection on the tube plate and the caulk weld to ensure that the repaired tube plate and the repaired caulk weld meet the equipment code requirement. Through the adoption of the method and the system, that the size of the repaired caulk weld meets the requirement is ensured, and a hardened layer and a stress corrosion risk can be eliminated.

The invention provides a foreign object damage gap calibration method capable of ensuring that a stress concentration coefficient is not less than 3. The method comprises the following steps of firstly, prefabricating an FOD notch in a blade, carrying out three-dimensional reconstruction on FOD damage through a three-dimensional optical scanning system to establish an FOD damage model; performingfinite element analysis on the blade model with an FOD, which is reversely obtained by three-dimensional reconstruction, calculating to obtain a stress concentration coefficient of the blade model, and recording a stress concentration coefficient value corresponding to the typical damage size; and building a neural network model by using a programming language, taking the damage size as the inputof the neural network, taking the stress concentration coefficient as the output of the neural network, and training the neural network model through loop iteration; and calibrating the damage size corresponding to the type of blade Kt = 3 through the trained network. When the anti-FOD capacity of the blade is assessed, an FOD notch can be prefabricated in the front edge of the blade through an air cannon method or a notch machining method according to the calibrated damage size.

A liner assembly for a duct includes noise attenuation panel for dissipating sound energy generated within the duct. A damage resistant acoustic panel for installation in high velocity impact prone locations includes a plurality of openings for communicating noise signals to the noise attenuation panel. At lease some of the openings includes a first diameter that extends a depth into the acoustic panel. The depth is no greater than the first diameter. A second portion extends the remainder of the thickness into the acoustic panel and includes a diameter greater than the first diameter. The increased area provided by the second diameter reduces restriction to the transmission of sound energy to the noise attenuation panel within an acoustic panel thickness required for protecting against foreign object damage.

A ceramic matrix composite blade for use in a gas turbine engine having an airfoil with leading and trailing edges and pressure and suction side surfaces, a blade shank secured to the lower end of each airfoil, one or more interior fluid cavities within the airfoil having inlet flow passages at the lower end which are in fluid communication with the blade shank, one or more passageways in the blade shank corresponding to each one of the interior fluid cavities and a fluid pump (or compressor) that provides pressurized fluid (nominally cool, dry air) to each one of the interior fluid cavities in each airfoil. The fluid (e.g., air) is sufficient in pressure and volume to maintain a minimum fluid flow to each of the interior fluid cavities in the event of a breach due to foreign object damage.

The present invention discloses a low foreign object damage nose weight for affixing to a either a standard or kinematic decoy flare comprising a thin walled nose cup having a closed end, an open end, an internal cavity, and at least one sidewall attached to said closed end and surrounding said internal cavity; and a metal powder disposed within the internal cavity for weighing down the forward end of the decoy flare, said nose cup capable of being affixed to a forward end of a decoy flare such that said powder is jettisoned from said nose cup upon burn out of a flare pellet subassembly of said decoy flare thereby reducing the weight of the nose cup and the possibility of foreign object damage to aircraft, ground troops, ground equipment and buildings resulting from the falling nose weight.

The invention discloses a method for detecting a dangerous part at the front edge of an aero-engine blade. The method comprises the steps of carrying out a dynamic stress test in an aero-engine working state test run, carrying out finite element modal calculation on blades, extracting a vibration stress simulation result under a modal corresponding to a dynamic stress test result, and the like. The stress level of each part of the front edge of the aero-engine blade under the working load can be detected, the dangerous part of the front edge of the aero-engine blade and the possible damage size during service can be accurately obtained, and data support can be provided for design of foreign object damage resistance of the aero-engine blade and formulation of a foreign object damage repairprinciple.

The hollow air pressure tamper-resistant shell container is similar to the glass hollow liner of the thermos bottle, but the container cover is also hollow, and the air pressure in the hollow part is less than atmospheric pressure. There are air pressure sensors and temperature sensors inside. The change is sensed by the air pressure sensor. Unauthorized opening of the container lid will cause the elastic mechanism in the container to send a signal. When the container is cooled by liquid nitrogen outside, it will be sensed by the temperature sensor in the container shell. The above signals are transmitted to the central control system, and then The central control system sends a control signal to the alarm, self-destruct device and other terminals.