756results about How to "Reduce thrust" patented technology

Embodiments of the invention relate to a vehicle comprising a plurality of inclined rotors that are operable to provide at least one of thrust and torque vectoring according to a desired thrust and/or torque vectors.

This invention concerns an aircraft propulsion system in which an engine has an engine core comprising a compressor, a combustor and a turbine driven by a flow of combustion products of the combustor. At least one propulsive fan generates a mass flow of air to propel the aircraft. An electrical energy store is provided on board the aircraft. At least one electric motor is arranged to drive the propulsive fan and the engine core compressor. A controller controls the at least one electric motor to mitigate the creation of a contrail caused by the engine combustion products by altering the ratio of the mass flow of air by the propulsive fan to the flow of combustion products of the combustor. The at least one electric motor is controlled so as to selectively drive both the propulsive fan and engine core compressor.

The invention relates to a position keeping method of a stationary orbit satellite, particularly to a position keeping method of an electric propulsion stationary orbit satellite, and belongs to the technical field of the orbit control of a satellite. Four thrusters of an electric propulsion system are mounted at the northwest, the northeast, the southwest and the southeast of the satellite back floor. For the four thrusters, the tangential distances and the normal distances relative to a satellite centroid are the same, and the thrust directions pass through the satellite centroid. A position keeping period comprises a one-day orbit determining period and n two-day small control periods, wherein the four thrusters in one small control period are respectively started, and at the same time, the orbit inclination, the flat longitude drifting ratio and the eccentricity ratio are controlled. The position keeping method disclosed by the invention solves the problem of the position keeping of the stationary orbit satellite of the electric propulsion system.

The invention provides a low-friction halogenated nano- or microparticulate coating and method for forming the coating on articles, such as implantable medical articles. The halogenated nano- or microparticles, desirably fabricated from PTFE, are present on the surface of the coating and covalently coupled to a coupling component, which facilitates formation of the coating. The coatings are biocompatible and can be formed on a selected portion of a medical device in a straightforward process. In some aspects the nano- or microparticulate coatings are formed on a system for the insertion of a medical device, wherein the system includes a catheter.

A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The bit body has a table near the center of the blade to reduce the speed at which the drill bores into hard material. The blade has a central slot extending into the forward end thereof such that the slot defines inner side walls and a bridge extending between the inner side walls. The bridge has sloping sides the define a central cutting edge so as to cut particles of hard material accumulating in the slot. The inner side walls intersect the leading faces of the blade and form cutting edges which further cut particles loosened at the center of the cut. Also, relief flats relieve the concentration of forces at the ends of the primary cutting edges of the blade.

The invention discloses a method for designing a bias orbit of a spacecraft in a halo orbit in a sun-earth three-body gravitational field. The invention proposes a semi-analytic-solution-based orbit design method for a task demand of thrusting the spacecraft in the halo orbit to a heliocentric grave orbit by adopting a small thrust force in the sun-earth three-body gravitational field. According to the method, the calculation amount can be greatly reduced while the orbit precision is ensured. In addition, the invention proposes a method for realizing orbit maneuvering by adopting a minute continuous thrust system which mixes a variable reflectivity solar sail with electric propulsion. The method for realizing the orbit maneuvering by a mixed thrust force is capable of greatly reducing fuel consumption. The purpose of orbit maneuvering with minimum fuel consumption is achieved through optimization design of a posture angle of the solar sail. Compared with a conventional pulse bias orbit design method, the method proposed by the invention has the advantages that the calculation time can be shortened to a great extent on the premise of ensuring the solving precision.

The invention relates to a circular awning with a cable dome and a spatial steel truss being combined and a construction method of the circular awning. The circular awning comprises an awning roof and a main body; the circular awning is an approximately spherical segment surface; the awning roof is of a cable dome structure; the main body is of a spatial steel truss structure; the bottom end of the cable dome is fixedly connected with the top end of the spatial steel truss structure. The spatial steel truss structure comprises at least one layer of weft curved beam which is a polygonal spatial steel truss. The spatial steel truss structure comprises at least two layers of weft curved beams and radial curved pillars; the radial curved pillars are connected with each layer of weft curved beams, and every two adjacent radial curved pillars are connected through weft pull rods which are arranged at intervals according to fixed latitudes. The circular awning disclosed by the invention combines tensile and rigid structures, integrates inward tension of the tensile structure and outward thrust of the spatial steel truss structure, and realizes self-balance of inside and outside stresses; the stress of an arched steel structure is reduced, the integral structural stability is better, and meanwhile, the horizontal thrust of the lower part of the steel truss structure and a support is reduced, the maintenance cost of late-stage anticorrosion is reduced, and the construction efficiency is high.

The invention discloses a rotating power-assisted mechanism and a lifting table applying the same. The rotating power-assisted mechanism comprises a transmission shaft arranged on a supporting memberand a driving device driving the transmission shaft to rotate, a slider is connected on the transmission shaft in a threaded manner, an energy storage element with axis parallel to that of the transmission shaft is arranged on the supporting member, the first end of the energy storage element is connected with the supporting member while the second end of the same is connected with the slider, andthe energy storage element is used for applying thrust on the slider and providing power assistance for rotating of the transmission shaft through the slider. The rotating power-assisted mechanism and the lifting table are low in manufacturing cost, simple in structure and high in safety.

The invention discloses a microwave-assisted rock breaking TBM cutter head for hard rocks. The cutter head comprises a TBM cutter head body, wherein the TBM cutter head body mainly comprises a single-edge rock breaking hobbing cutter, a double-edge rock breaking hobbing cutter, a plurality of water injection dedusting openings and a plurality of microwave-assisted rock breaking emitters; the cutter head covers rock breaking paths in different tracks through the combination of the double-edge rock breaking hobbing cutter and the single-edge rock breaking hobbing cutter; a cutter head panel is provided with the water injection dedusting openings; the cutter head panel is provided with the microwave-assisted rock breaking emitters; each microwave-assisted rock breaking emitter comprises a microwave emitting disc, a wave guiding structure and a microwave emitting module. The cutter head has the advantages that a microwave emitting device is started in case of hard strata, rocks are rapidlyheated through microwave, mechanical properties of rocks, such as the point load strength, uniaxial compressive strength and tensile strength, are reduced, rock joint fissure assisted TBM hobbing cutter rock breaking is added, the penetration speed of disc cutters is improved, the rock breaking rate is improved, the thrust and torque of TBM equipment are reduced, abrasion of the hobbing cutters in hard rocks and cutter changing frequency are reduced, the construction period can be greatly reduced, and the construction investment can be reduced.

A component-placing apparatus for driving a nozzle in the rotational and vertical directions for applying suction to a component includes a rotary actuator and a linear actuator having a stator connected to a stator of the rotary actuator such that these stators are immovable relative to each other. A spline shaft is connected to a rotating shaft of the rotary actuator, and a nozzle connecting shaft having a suction nozzle disposed at the bottom thereof is engaged with the spline shaft and is allowed to move only rectilinearly. A hollow holder encircling the nozzle connecting shaft with rotary bearings being interposed therebetween is connected to a mover of the linear actuator, and the hollow holder is engaged with the stator of the linear actuator with a linear guide being interposed therebetween.

The invention relates to a waterpower oscillator through which effective pressure can be exerted on a drill bit and well drilling efficiency can be improved in the technical field of oil exploitation. The waterpower oscillator comprises an upper connector, a stator, an outer shell and a lower connector all of which are sequentially connected in a sealed mode. A rotor is eccentrically arranged inside the stator, and the lower end of the rotor is sequentially connected with a cardan shaft upper connector, a cardan shaft and a cardan shaft transmission rod. The lower end of the cardan shaft transmission rod is connected with the outer shell in a sealed mode, the lower end of the outer shell is in threaded connection with the lower connector in a sealed mode, the lower end of the cardan shaft transmission rod is provided with a vibration valve in a matched and sleeved mode, and the vibration valve can do reciprocating sliding motion along the matched surface relative to the cardan shaft transmission rod. The lower end of the vibration valve is provided with a movable valve plate in a sealed and sleeved mode, wherein the movable valve plate and the vibration valve can do the synchronous movement, the upper end of the lower connector is correspondingly provided with a fixed valve plate attached to the movable valve plate, the movable valve plate and the fixed valve plate are respectively provided with a sector channel with the area larger than that of a half circle. An annular hollow part through which liquid can flow is formed among the rotor, the cardan shaft upper connector, the cardan shaft, the stator and the outer shell, the cardan shaft transmission rod is provided with a channel communicated with the annular hollow part, and the channel is communicated with a vibration valve cavity and the sector channels.

A portable, vertical tower fan capable of generating a vertically oriented exhaust air stream that conforms better to a user at an elevation above a support surface. The device includes an vertically elongated housing, an air blower assembly located within the elongated housing and a base provides a space saving design.

Provided are a slant grouting control steel anchor pipe frame and a construction method thereof. A primary grouting body is poured to the peripheral space of a steel anchor pipe through a primary grouting pipe; after the primary grouting body is solidified, a secondary grouting body is poured to the outside through a secondary grouting hole in the steel anchor pipe wall in a compression mode, the secondary grouting body splits the primary grouting body through the secondary grouting hole and is diffused to a peripheral rock and earth mass and forms a mixed grouting body with the primary grouting body. A concrete beam is poured along a slope to wrap the top of the steel anchor pipe in the beam. The slant grouting control steel anchor pipe frame combines the advantages of an anchor rod frame and a grouting control technology, the steel anchor pipe is used as a protection measure and a secondary grouting channel, and by means of improvement of the strength of the peripheral rock and earth mass through the secondary grouting, a steel pipe and the peripheral rock and earth mass form a whole body to defend a slope together. A slant grouting control steel anchor pipe frame structure has the advantages of being advanced in technology, reasonable in economy, fast in construction and the like and is a novel slope reinforcing technology with good developing prospects.

A constant velocity universal joint comprises a plurality of trunnions which are formed to be spherical, sliding surfaces which extend in a flat configuration along an axial direction of an outer cup, and pairs of slipper members having one side surfaces which are formed with recesses for making contact with spherical surfaces of the trunnions and the other side surfaces which are formed with flat surfaces to make contact with the sliding surfaces, wherein the pair of slipper members are provided slidably with respect to the sliding surface and the spherical surface of the trunnion.

A pulse detonation engine including one or more fuel injectors comprising one or more piezoelectric driving stacks wherein a flow control member of each injector is driven directly by the one or more piezoelectric stacks without additional amplification means or interposing elements while a flow area of the nozzle is variably adjustable to deliver controlled flow rates in a desired flow profile to improve engine performance and reduce emissions. The pulse detonation engine configured to support variable mission and operational requirements including delivery of required thrust using specific fuel types and with power and performance of the pulse detonation engine variably adaptable. The fuel injectors associated with the pulse detonation engine configure to deliver specified flow rates with minimal linear movement of the flow control member. The injector and drive electronics configured to deliver higher frequency operation and response with increased operational stability.

A liquid supply mechanism includes a lower cover, an upper cover, a plunger, at least one resilient member and at least one damping member. The lower cover has a liquid outlet and the upper cover is connected to the lower cover. A chamber is formed between the lower cover and the upper cover. The chamber communicates with the liquid outlet and contains a cooling liquid. The upper cover has an axial hole. The plunger is movably disposed in the chamber. The plunger has an axial rod and the axial rod is inserted into the axial hole. The resilient member is disposed in the chamber. Opposite ends of the resilient member abut against the upper cover and the plunger. The damping member is disposed on the axial rod and abuts against an inner wall of the axial hole.

According to an aspect of the present invention, there is provided a lid system including: a lid mounted to a recess to be opened and closed; a locking unit that retains the lid in a locked state to keep the lid closed; and a lock releasing unit that releases the locked state to open the lid. The locking unit includes: a pin that is protruded from a peripheral edge of the lid to be engaged with a hole on the recess in the locked state and retreated to release the locked state. The lock releasing unit includes: a push button pushable in a pushing direction; and a pushing element moved to push the lock pin in an opposite direction of the pushing direction by being linked with the push button.