45results about How to "Additional resistance is small" patented technology

The invention discloses a horizontal testing device for a reliability test of an aircraft landing gear door uplock. The horizontal testing device is composed of a connecting and supporting structure, a simulated door structure and a driving and loading structure, wherein the door uplock to be tested, the simulated door structure and the driving and loading structure are all installed on the connecting and supporting structure, the simulated door structure comprises a lock ring, a lock ring support, a rotary cross beam and a bearing support, and the driving and loading structure comprises a composite rocker arm, a transmission connecting rod, a main bearing shaft, a hydraulic actuator cylinder, an actuator cylinder transmission connecting rod, a loading assembly and a loading transmission connecting rod. The horizontal testing device can be matched with a vibration table to achieve vibration stress loading, can be matched with a comprehensive environment testing box to achieve the change of working temperature, can be matched with a hydraulic system to achieve the work triggering of the door uplock to be tested, and can simulate the loading of aerodynamic loads through a loading structure. According to the horizontal testing device, the loading structure is compact, the degree of freedom of work is high, additional resistance is small, circular motion of the lock ring can be achieved, and load control is accurate.

To provide a turbofan jet engine for a supersonic aircraft, which enables a supersonic cruise with small additional drag due to engine installation while minimizing the jet noise at takeoff. In the turbofan jet engine, two fans, i.e., a front fan and an aft fan, are disposed, and an air inlet and an air outlet are provided on each of the front and aft fans, whereby at takeoff, air is introduced to each of the air inlets of the front and aft fans to drive the front and aft fans in parallel, and the air is then ejected from each of the outlets. On the other hand, during a supersonic cruise, an inlet of an aft fan duct is coupled to an outlet of a front fan duct, where external air is introduced only to an air inlet of the front fan duct and the air compressed through the front fan is fed to the aft fan duct and further compressed through the aft fan, and ejected from a nozzle, so that the front and aft fans are driven in series.

The invention provides anoil well low differential pressure addition sand prevention process method. The method includes the following steps of step 1 preparingwellholes, lifting original well tubularcolumns, conductingexploratory sand, pigging, scraping tubes, and performingpressure tests on oil tubes and casings; step 2, pretreating stratum, after the tubular columns are put in, openingaoil tubevalve to control spray, conducting nitrogen foam flowback, conducting exploratory sand, and washing wells; step 3, performing gravel filling sand prevention construction; step 4, performing sand filter tube hanging sand prevention construction; step 5, performing anti-adsorbent agent squeezing construction. The methodcan reduce the additional resistance of a gravel filling layer and a wellhole sand blocking layer of the well near the oil reservoir oil well of water flooding, polymer flooding and the polymer flooding converting into the subsequent water flooding, and is the most effective sandprevention process for loosing extract production of the oil well in the middle and later periods of sandstone oil reservoirs.

The invention discloses a foldable fence device for a ship air layer drag reduction system, which is arranged on a ship flat bottom of an air layer drag reduction ship, a ship bottom cabin is arrangedabove the ship flat bottom, and the foldable fence device comprises a plurality of air hole coamings and a plurality of driving structures. The cavitation coamings are rotationally connected to the lower surface of the flat bottom of the ship, and after the cavitation coamings are rotationally unfolded, the cavitation coamings are matched to define a cavitation used for containing an air layer ofthe air layer drag reduction ship. Each cavitation coaming is provided with one or more driving structures, each driving structure comprises a driving part and a transmission part, the driving partsare arranged in the ship bottom cabin, one end of each transmission part is connected with the corresponding driving part, the other end of each transmission part penetrates through the ship bottom tobe connected with the corresponding cavitation coaming, and a sealing structure is arranged between each transmission part and the ship bottom; the driving piece drives the cavitation coaming to rotate relative to the boat flat bottom through the transmission piece, and unfolding or folding of the cavitation coaming is achieved. According to the ship bottom cutting device, the ship bottom needs to be cut and machined only at the position where the transmission part penetrates through, and therefore transformation of the ship bottom is small.

The invention discloses a flow control method for inhibiting surface cavitation phenomenons of an underwater vehicle and a hydrofoil. The method comprises the steps that porous medium materials are adopted and fixed to the local or total fixing wall surface of the underwater vehicle or the hydrofoil, and the specific fixing position is one of the following situations: A, the porous medium materials are fixed to the upstream region of the primary cavitation position of the fixing wall surface of the underwater vehicle or the hydrofoil; B, the porous medium materials are fixed to the neighborhood of the primary cavitation position of the fixing wall surface of the underwater vehicle or the hydrofoil; C, the porous medium materials are fixed to the corresponding cavitation region of the fixing wall surface of the underwater vehicle or the hydrofoil; D, the porous medium materials are fixed to the corresponding cavitation tail portion and the neighborhood region of the fixing wall surface of the underwater vehicle or the hydrofoil; E, the porous medium materials are fixed to the corresponding cavitation tail downstream region of the fixing wall surface of the underwater vehicle or the hydrofoil. According to the flow control method, the cavitation flow phenomenons of the porous medium neighborhood even the fixing wall surface of the whole underwater vehicle or the hydrofoil are effectively inhibited.

The invention discloses a retractable tail boom undercarriage of a tail sitter type vertical takeoff and landing aircraft. The retractable tail boom undercarriage consists of the tail sitter type vertical takeoff and landing aircraft, main landing gears, a tail boom, supporting rods, tail boom driving mechanisms and supporting rod driving mechanisms, wherein the main landing gears are symmetrically arranged below the tail sitter type vertical takeoff and landing aircraft and serve as main supporting components of the aircraft parking on the ground. The tail boom and the supporting rods are respectively mounted on the upper side and the lower side of wings of the aircraft; the tail boom is provided with tail boom rods, vertical fins, a horizontal tail and horizontal tail driving mechanisms;the tail boom driving mechanisms and the supporting rod driving mechanisms are symmetrically arranged on two sides of an aircraft fuselage and are used for driving the tail boom and the supporting rods to be opened or closed; the retractable tail boom undercarriage realizes a supporting effect when the aircraft parks on the ground and realizes the effects of manipulating and balancing the aircraft when the aircraft is in a horizontal flying state. The retractable tail boom undercarriage of the tail sitter type vertical takeoff and landing aircraft has the characteristics of compact structure,light weight and multiple functions.

The invention relates to a plowland deep soil reservoir setting machine. A plow pan is formed in soil after dry farming land is used for a long time, therefore, the water permeability and the water holding capacity of the soil are reduced; the surface runoff can be generated during the snow melting period in spring or after torrential rain in summer to cause water, soil and fertilizer runoff, therefore, the water and fertilizer supply amounts for crops are reduced, and the crop yield is decreased. The plowland deep soil reservoir setting machine comprises a stand (3) which is connected with a feeding device; a pneumatic charging machine (12) is arranged on the stand, a rat runway opener column (5) is connected to the lower part of the stand, the back side of the rat runway opener column is connected with a feeding pipe (4), and a rat runway opener (6) is connected to the lower part of the rat runway opener column; the stand is connected with ground wheels (8) through a ground wheel bracket and a bracket base (9), the front end of the stand is connected with a suspension rack (10), a control device (11) is arranged on the stand, and the control device comprises an automatic control system and a hydraulic driving control system. The plowland deep soil reservoir setting machine is used for setting a soil reservoir in the deep layer of plowland and improving the crop yield.

The invention relates to a selective inflow control device based on the cyclone resistance increasing effect. The selective inflow control device based on the cyclone resistance increasing effect comprises a central tube, an outer cylinder, a controller main body and a flow guiding device, wherein the outer cylinder sleeves the center tube, an annular cavity is formed between the outer cylinder and the center tube, and one end of the outer cylinder is hermetically connected with the middle part of the center tube; the controller main body is fixed to the center tube, the controller main body is configured to enable fluid in the annular cavity to be introduced into the center tube, the controller main body is provided with two cyclone systems for identifying and distinguishing fluid and increasing resistance to the fluid in a distinguishing mode; and the flow guiding device is arranged in the annular cavity, the flow guiding device is fixed to the outer wall of the center tube and is configured to be capable of guiding the fluid to the controller main body. The selective inflow control device based on the cyclone resistance increasing effect has the function of accurately identifying fluid and can automatically adjust the current limiting resistance according to the change of the property, composition and inflow rate of the formation fluid, the bottom water coning phenomenon isprevented, and long-term stable production of horizontal wells is ensured.

The invention discloses a prerotation fan-shaped conduit for a right-handed single-screw ship. The prerotation fan-shaped conduit comprises a first vane, a second vane, a third vane, a fourth vane and an arc guide plate; from the rear side of a screw propeller, the left side of a longitudinal central line of a screw impeller hub is sequentially provided with the second vane and the first vane from top to bottom, the right side is sequentially provided with the third vane and the fourth vane from top to bottom, an angle formed between the first vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees, an angle formed between the second vane and the longitudinal central line of the screw impeller hub is 25 to 30 degrees, an angle formed between the third vane and the longitudinal central line of the screw impeller hub is 35 to 45 degrees, and an angle formed between the fourth vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees. Compared with the three-vane prerotation triangular conduit, the third vane plays a role in supporting and reinforcing the prerotation and is also arranged outside an air bubble sensitive area, and the adverse impact on the air bubble performance can be avoided.

The invention provides an Ackerman steering trapezium control method, device, mechanism and system and an automobile with the system. According to the Ackerman steering trapezium control method, a first steering vehicle wheel and a second steering vehicle wheel are controlled by the Ackerman steering trapezium control mechanism to change in a preset range according to an Ackerman theoretical curve. The Ackerman steering trapezium control method comprises the following steps that torque data, rotation angle and acceleration data, position data of a first retractable steering arm and a second retractable steering arm and vehicle speed data are acquired; according to the torque data, the rotation angle and acceleration data, the position data of the first retractable steering arm and the second retractable steering arm and the vehicle speed data, the first retractable steering arm and the second retractable steering arm are controlled to conduct extension and retraction to drive the firststeering vehicle wheel and the second steering vehicle wheel to change in the preset range according to the Ackerman trapezium theoretical curve. According to the Ackerman steering trapezium controlmethod, pure rolling of the vehicle wheels can be achieved at the same time of vehicle steering, and the steering performance is improved.

The invention relates to a high-viscosity medium flow distributing type mixer, which is applied to occasions of mixing of high-viscosity mediums, adding new mediums to high-viscosity mediums and the like. The high-viscosity medium flow distributing type mixer adopts the technical scheme that a branch pipe extends into a pipe body from the side surface; a plurality of finger-shaped pipes are radially expanded, and welded to the end part of the branch pipe; the tip ends of the finger-shaped pipes are distributed at the whole cross section of the pipe body. The high-viscosity medium flow distributing type mixer has the advantage that by adopting the type of gradually and uniformly adding new mediums to the high-viscosity medium flow field, the mixing is realized by the natural flowing of the medium, so that the disturbance of fluid is not needed, and the additional drag is little.

The invention provides a low-resistance electromagnetic pin puller and a spacecraft, and relates to the technical field of aerospace technologies. The low-resistance electromagnetic pin puller comprises a pin puller housing, an armature moving part, a coil assembly and a resetting mechanism, wherein the armature moving part is inserted into the pin puller housing and can move relative to the pin puller housing; the coil assembly and the reset mechanism are both arranged in the pin puller housing, and the coil assembly is arranged outside the armature moving part and the reset mechanism in a sleeving manner; and a reset gap is reserved between the reset mechanism and the armature moving part, and the reset mechanism is provided with a vent hole group for discharging air in the reset gap. The low-resistance electromagnetic pin puller can reduce the additional resistance caused by the fact that the air cannot be discharged, it is ensured that the armature moving part can move quickly, andthe use state in space is consistent with the ground test state.

The invention discloses a general shovel tip of an ant-lion-like vibration and structure coupling resistance-reducing deep-loosening shovel. In order to solve the problems of large working resistance,high deep-loosening operation cost and large deep-loosening energy consumption of a deep-loosening machine. The shovel tip comprises a structurally bionic deep-loosening shovel tip body and a vibrating bionic member; a shovel tip matrix in the structurally bionic deep-loosening shovel tip body is a triangular curved plate structure member with uniform thickness; the contour curve of the cross section of the shovel tip matrix is a simplified arc-shaped geometric contour line which is obtained through bionic reverse calculation of the contour curve of the cross section of the back of an ant lion; the outer diameter of the simplified arc-shaped contour line is 400 mm-500 mm; the inner diameter of the contour line is smaller than the outer diameter of the contour line, and the difference between the inner diameter of the contour line and the outer diameter of the contour line is double the thickness of the shovel tip matrix, wherein the thickness of the shovel tip matrix is 6 mm-10mm. Theback of the shovel tip matrix is provided with base mounting holes in the vibrating bionic member, main cover plate base mounting holes and threaded holes opposite to auxiliary cover plate base holes. The vibrating bionic member is fixedly bolted to the back of the shovel tip matrix through a main cover plate, a vibrating motor fixing frame and an auxiliary cover plate in the vibrating bionic member.

The invention relates to a method for controlling a steering system, the steering system and a vehicle. The steering system comprises two steering wheels and two sub-steering devices, wherein the twosub-steering devices are used for respectively driving the two steering wheels. The control method comprises the steps of determining a target steering wheel which corresponds to a steering signal anda first target steering angle of the target steering wheel in response to the obtained steering signal of the vehicle; determining a second target steering angle of the other steering wheel except the target steering wheel according to the first target steering angle of the target steering wheel, wherein the first target steering angle and the second target steering angle meet a steering angle corresponding relation; and controlling one sub-steering device to drive the target steering wheel to steer according to the first target steering angle, and controlling the other sub-steering device todrive the other wheel except the target steering wheel to steer according to the second target steering angle. Thus, the two wheels can be steered according to the steering angle corresponding relation for reducing additional resistance and excessive abrasion of tires in a driving process.

The invention discloses an oil well fluid self-adaption device and a fluid control device. The oil well fluid self-adaption device comprises an oil pipe and an outer pipe and further comprises the fluid control device, the oil pipe is concentrically arranged in the outer pipe, an annular channel is formed between the oil pipe and the outer pipe, the outer pipe is provided with an outer pipe fluidinlet, the oil pipe is provided with a radial fluid control port, and the radial fluid control port is provided with the fluid control device. The oil well fluid self-adaption device can automaticallyadjust flowing resistance passing through the oil well fluid self-adaption device according to fluid properties, specifically, when the water content is low, the oil well fluid self-adaption device has certain resistance to a fluid, the influence of the heel end effect and reservoir heterogeneity can be offset, and a production profile is propelled in a balanced mode; and along with the increaseof the water content, the flowing resistance of the fluid control device is remarkably increased, the flow of a water outlet layer section is remarkably inhibited, and long-term stable production of an oil-gas well is guaranteed.

The invention relates to an overhead arc-shaped slide way type rack traction device. The device comprises a front-end trolley, a front-end rack box, a tail-end rack box, a transmission gear, wheels, an arc-shaped slide way, brackets and a fixed rail. The front-end trolley can move along the fixed rail, one end of the front-end rack box is connected with the front-end trolley, and the other end ofthe front-end rack box is hinged to the tail-end rack box and meshed with the transmission gear through a rack; the arc-shaped slide way is composed of a horizontal straight section and an arc section, supported by the brackets and arranged at the left end of the transmission gear; the wheels are fixedly arranged at the end of the tail-end rack box. The tail-end rack box can be driven to roll, horizontally move, rotate, swing and warp in the air along the arc-shaped slide way, the impact force and energy consumption of equipment are remarkably reduced, the equipment weight is reduced, the running stability and safety of the equipment are improved, the requirements for larger traction weight, longer traction stroke, higher strength, larger impact force and narrow places are met, and the device is simpler in structure and more practical.

The invention discloses a scraper conveyor and a loader with fusion covering textures. The scraper conveyor and the loader respectively comprise a middle plate, a bottom plate and channel steel, wherein at least one of the middle plates, the bottom plates and the channel steels is covered with a texture in a fusion way; each texture consists of at least one of a straight wearing strip, a diamond-shaped wearing strip, a curved-shaped wearing strip, a splay-shaped wearing strip, and a V-shaped wearing strip; the height of each texture is 1.5 to 2.5mm. The scraper conveyor and the loader with the fusion covering textures have the advantages that the abrasion-prone parts of the middle plates, the bottom plates and the channel steels of each part of the scraper conveyor and the loader are critically protected by the fusion covering textures, the service lives of the scraper conveyor and the loader are prolonged, the number of overlapping points is reduced, and the energy consumption is decreased.