39results about How to "Improved aerodynamic stability" patented technology

The invention discloses a self-anchored hybrid beam cable-stayed suspension cooperative system bridge, belongs to the technical field of constructional engineering, and particularly relates to a design for a large-span bridge in the bridge engineering. The bridge is characterized in that after a cable tower and side hole piers are manufactured, a cantilever is assembled to a concrete main bridge of the cable-stayed bridge; after the cantilever is assembled to a side hole, a main cable is hung, two ends of the main cable are anchored on an anchor block at the outer end of a concrete beam respectively, and the anchor block is pulled to a temporary anchor structure by a temporary anchor cable; a hanging rod is hoisted to span each section of steel main beam by a cable crane; after folding, the temporary anchor cables are detached in batch, and the main cables are completely anchored at two ends of the concrete main beam so as to finish the system conversion from temporary ground anchorage to self anchorage; and deck paving and rail construction are finished, the cable force of the whole bridge is adjusted, and the bridge is formed. The self-anchored hybrid beam cable-stayed suspension cooperative system bridge has the effects and advantages of solving the problems of the large-span bridge in design and construction, reducing the height of the tower, fully playing a role of materials, reducing the construction cost, shortening the construction period and reducing the risk in the construction process.

A finless projectile provides improved ease of use, aerodynamics, muzzle velocity, drag, target, and excursion accuracy, structural integrity, terminal effectiveness and safety, at lower cost. The finless projectile includes a slug, a forward projectile body, an aft projectile body, an obturator, and a pad. The finless projectile is a full bore projectile that defines a hollow core, but does not include a sabot nor does it carry explosives. The finless projectile functions by kinetic energy transfer from the projectile to the target by deforming the target. The center of gravity of the finless projectile is forward of the center of pressure to provide static stability to the finless projectile.

An umbrella device which has a shank, an umbrella-like cap formed as a membrane and a driver. The membrane is connected to the shank and is caused by the driver to move from a position of rest where it droops limply around the shank to an open position where it is essentially horizontal due to the centrifugal forces of the membrane produced by the rotation of the membrane by the driver.

A ballistically launched foldable multirotor vehicle has a central body frame. A battery is located in an upper vertical location of the vehicle and positions a center of mass of the vehicle to provide aerodynamic stability during a launch. Fins are attached to the central body frame such that aerodynamic forces on the fins shift an aerodynamic center (AC) of the vehicle downward below the center of mass of the vehicle. Three or more foldable arms are attached to the central body frame via a hinge and exist in two states—a closed state where the foldable arms are parallel to a central body axis, and an open state (after launch) where the foldable arms extend radially outward perpendicular to the central body axis. Rotors mounted to each foldable arm are controlled by a motor to enable flight.

A solid projectile for a firearm having a central cylindrical section defining a bearing surface and an integral, coaxial leading section tapered into a uniform conical surface, the apex at the distal end thereof projecting to a point or apex. The apex angle of the conical surface of the leading section of the projectile is within the range of 20°-40° of arc.

The present disclosure relates to a method for improving aerdynamic stability of a working fluid flow through a compressor of a turbomachine, in particular through a compressor of gas turbine used for power production, particularly against rapidly changing aero speed of the compressor. The method comprises to introduce a first water mass flow to the working fluid flow of the compressor. Furthermore, the disclosure relates to a turbomachine, in particular a gas turbine, which can be driven according to the above method.

The invention relates to a ground-anchored-self-anchored suspension combined system bridge which belongs to the technical field of constructional engineering and particularly relates to a design of a long-span bridge under a complex geologic condition in bridge engineering. The ground-anchored-self-anchored suspension combined system bridge is characterized in that after a tower and a lateral hole pier are constructed, a concrete main girder of a cable-stayed bridge begins to be assembled through a cantilever; after the cantilever is assembled to a lateral hole, a main cable is suspended, one end thereof is anchored on a permanent anchor block, the other end thereof is anchored on a concrete girder external anchor block, and the anchor blocks are pulled on a temporary anchor through temporary anchor cables; the end of a main girder provided with the permanent anchor block is horizontally supported on a bridge abutment; each segment of a main steel girder in a span is hoisted through a cable crane; after folding, the temporary anchor cables are dismantled in batches, and the main cable is completely anchored at the end part of the main girder to finish the system switching from the temporary anchor to a self-anchor. The invention has the effects and advantages that material performance is fully exerted, and by aiming at the complex geologic condition, the huge anchor is saved, the construction cost is lowered, the construction period is shortened, and the risk in the construction process is reduced.

The invention discloses an active stability control method based on an aero-engine stability margin estimation. The method comprises the following steps: (1) an aero-engine surge real-time model; (2)surge margin estimation algorithm and simulation; (3) Active stability control law of aeroengine. As to that problem of aerodynamic stability of an aero engine, By utilizing the residual stability margin to improve the aerodynamic stability of the engine, The real-time model of engine surge and the estimation model of engine stability margin are established. The active stability control law is designed by robust control method, and the closed-loop control loop of engine stability margin is constructed, which ensures that the dynamic performance brought by the residual stability margin can be brought into full play under the condition of stable operation of the engine in transient state. In addition, this scheme can make the engine work at the high performance point with small surge marginduring acceleration, improve the acceleration performance of the engine and enhance the maneuverability of the aircraft.

A system for improving the performance of a powered boat that includes both methods and apparatuses that provide a powered boat means to stabilize, control, and optimize the powered boat's performance when the powered boat is in powered motion. The system provides capabilities of enhancing the powered boat's performance by responding to both aerodynamic and hydrodynamic effects upon the powered boat when the powered boat is in motion. Some embodiments of the system are capable of altering its means of response to aerodynamic effects while the powered boat is in powered motion, other embodiments are capable of altering the powered boat's response to hydrodynamic effects while the powered boat is in powered motion, and still other embodiments are capable of altering the powered boat's response to both aerodynamic and hydrodynamic effects while the powered boat is in powered motion. Certain embodiments of the system are capable of utilizing aerodynamic elements that operate on the air stream flowing within a tunnel formed within a multihull of a powered boat, while other embodiments are capable of mitigating the effects of water impacts upon the roof of a tunnel formed within a multihull powered boat. Still other embodiments are capable of responding to aerodynamic effects by interacting with portions of the air stream that passes above the boat while mitigating the potential for negative effects due to cross-winds impacting the structure which rises above a deck of the powered boat.

The invention aims to provide a control method of a titanium alloy compressor tip clearance. The control method is characterized in that an abradable sealing coating is sprayed on the inner wall of acasing; tips of rotor blades are compositely electroplated with a Ni / c-BN coating; and the abradable sealing coating and the Ni / c-BN coating are used as a pair of abradable sealing friction pair, thereby forming a novel gas circuit sealing coating structure. In the operation process of an engine, the tips of the rotor blades can cut into the abradable sealing coating on the inner wall of the casing, thus grooves capable of improving the sealing effect are reserved, ideal radial airflow gaps are formed, and the maximum pressure difference is obtained, so that the power of the engine is remarkably improved, the consumption of aviation kerosene is reduced, and the one-time test run percent of pass of the whole engine is improved.

The invention discloses an airship comprising an airship body; the airship body comprises an upper half part and a lower half part; the upper half part and the lower half part both comprise arc projections, wherein eh arc projection of the upper half part is higher than that of the lower half part. The airship is spindle-shaped; the interface contours of the upper half part and the lower half partare oval. The design of the airship's surface increases the lift of the airship's surface, thus saving the power consumption of the airship.

A deployable panel for a vehicle, the deployable panel including: a telescopically adjustable body, where, when in a retracted state, the body is configured to be enclosed within at least a portion of the vehicle, and where, when in an extended state, the body is configured to reduce aerodynamic drag generated during movement of the vehicle or increase aerodynamic stability against external forces impacting at least one side of the vehicle; and a linear actuator installed within the body, the linear actuator configured to telescopically adjust the body from the retracted state to the extended state or somewhere therebetween.

The invention discloses a distributed parameterized impeller self-circulation treatment casing which is composed of a casing body, an air inlet channel, impeller blades, a front channel, a rear channel and air entraining bridge circuits; the air entraining bridge circuits are fixed to the outer side of an impeller casing, and air flows back in the bridge circuits through the front channel and therear channel connected to a channel front edge of the impeller casing; and the front channel and the rear channel of the impeller self-circulation treatment casing are located at the positions with different axial chord lengths away from an impeller inlet respectively, an inner wall face two-dimensional molded line is formed by fitting and optimizing a structured curve so as to ensure that jet flow is close to the wall face as much as possible, and the outer wall face molded line is a controllable contraction molded line, so that the effects of guiding and accelerating airflow are achieved. The impeller self-circulation treatment casing utilizes the airflow pressure difference in rotor channels corresponding to the self-circulation front channel and the self-circulation rear channel to perform air exhaust and air injection. According to the treatment casing structure, the blocking margin and the stall margin of the centrifugal impeller can be improved, the purpose of reducing the efficiency loss is achieved, and the impeller can operate and work at a larger margin.

The invention relates to a fluid-solid coupled gas shock wave adjusting bearing. At present, a widely used dynamic pressure foil-bearing is limited in carrying capacity and lacks of stability and the coating process requirements on the surface of a foil are high, and a static pressure-dynamic pressure mixed bearing is insufficient in carrying capacity at a slow rotating speed while is pneumatically unstable at a high rotating speed. The bearing provided by the invention comprises a bearing bush (1) which is provided with air supply throttling orifices (3), damping cavities (4) are arranged in the outlet positions of the air supply throttling orifices, one or more than one row of air supply throttling orifices and the damping cavities is uniformly distributed circumferentially on the inner surface of the bearing bush, and foil structures (7) are arranged between the outlets of the damping cavities and a rotor (2); the foil structures comprises bump foils (6) and flat foils (5). By changing the air supply pressure of the bearing, the throttling orifice structures and the damping cavity structures, the fluid-solid coupled gas shock wave adjusting bearing can be matched with a large-gap high-load bearing working condition. The invention is the fluid-solid coupled gas shock wave adjusting bearing.

The present disclosure relates to a method for improving aerdynamic stability of a working fluid flow through a compressor of a turbomachine, in particular through a compressor of gas turbine used for power production, particularly against rapidly changing aero speed of the compressor. The method comprises to introduce a first water mass flow to the working fluid flow of the compressor. Furthermore, the disclosure relates to a turbomachine, in particular a gas turbine, which can be driven according to the above method.

The invention discloses a composite wing unmanned aerial vehicle and an aerodynamic balance method. The composite wing unmanned aerial vehicle comprises a fuselage, wings located on the two sides of the fuselage, a main rotor located at the front end of the fuselage and auxiliary rotors installed on the wings. The unmanned aerial vehicle further comprises a pneumatic balance mechanism, the pneumatic balance mechanism comprises an air chamber installed on the vehicle body and drainage pipes connected to the air chamber, every two drainage pipes form a group, and each group of drainage pipes comprises a left drainage pipe and a right drainage pipe which are located on wings on the two sides of the vehicle body correspondingly. The controllability of the unmanned aerial vehicle is improved, and the use safety of the unmanned aerial vehicle is improved.

A penetrator includes a fore body comprising a pin and having a center of aerodynamic pressure forward of a center of gravity and a stabilizing portion comprising a material of lower density than that of the fore body and a plurality of outwardly extending fins for improving an aerodynamic stability of the projectile and defining a bore in which the pin is received for removably attaching the fore body thereto such that, when attached to the fore body, a center of gravity for the penetrator is forward of a center of aerodynamic pressure for the penetrator.

The invention discloses a miniature fixed-wing unmanned aerial vehicle with a belly adsorbed on a wall surface, which comprises a main wing, a vector power system, a pneumatic control surface, a vertical fin, an adsorption-separation system and a belly equipment bin, wherein the adsorption-separation system is mounted on the middle upper side of the belly; the adsorption-separation system comprises bionic adsorption dry glue and a separation servo mechanism; the bionic adsorption dry glue is laid on the outer side of the belly in the front-back direction of the main wing and is used for adsorbing a wall surface; two sets of separation servo mechanisms are symmetrically mounted on two sides of the belly and are used for realizing separation of the bionic adsorption dry glue from the wall surface; and the separation servo mechanism comprises a wall separation servo steering engine, a wall separation cam and a wall separation rocker arm. After the unmanned aerial vehicle flies to a preset site for a long distance, low-power-consumption long-time adsorption on a vertical wall surface can be realized, a reconnaissance task can be executed in the adsorption process, and the unmanned aerial vehicle is separated from the wall surface and returns after being completed.

The invention belongs to the technical field of carrier-based aircraft engine design, and particularly relates to a method and device for improving the aerodynamic stability of a carrier-based aircraft engine based on state identification. The method for improving the aerodynamic stability of the carrier-based aircraft engine based on state identification comprises the following steps that firstly, landing gear state, flight height, engine mach number and engine accelerator lever position information of an aircraft are acquired; then the validity of a takeoff status identification signal of the aircraft is determined; then the flight state of the aircraft is determined, and finally the compressor inlet adjustable stator blade angle control law and the engine nozzle control law of the aircraft under different flight states are separately arranged, so that the aerodynamic stability of the engine is improved. According to the method and device for improving the aerodynamic stability of the carrier-based aircraft engine based on state identification, a2 and A8 geometric area control methods are classified and designed in detail according to the flight state, a takeoff / ejection takeoffstate and a landing / go-around state according to the engine use environment, so that the aerodynamic stability of the engine is greatly improved, and the aerodynamic stability working margin of the carrier-based aircraft engine is greatly increased.

The invention discloses an airship comprising an airship body; The airship body comprises opposite upper ball crown part and a lower ball crown part, wherein the bottoms of the upper ball crown part and the lower ball crown part are sealingly connected so that the profiles of the airship is dish-like. The camber of the upper ball crown is larger than that of the lower ball crown so that the airship body has a positive curved dish profile. According to the airship of the invention, the dish-like design is adopted so as to reduce wind resistance in all directions during flight and increase the profile lift of the airship, therefore saving power consumption.