67 results about "Flow interference" patented technology

The invention discloses a one-hole grouting and filling dual-purpose method implemented by the aid of ground gas extraction drill holes. The one-hole grouting and filling dual-purpose method is applicable to underground coal mines. The one-hole grouting and filling dual-purpose method includes extracting pressure relief gas of adjacent coal seams by the aid of the first ground gas drill holes in exploitation procedures; tripping grouting stopping wooden plugs in the first ground gas drill holes after extraction is completed and then gas starts to be extracted by the second ground gas drill holes, and cutting second cut solid casings to form cut openings; forming channels communicated with separation layers; grouting and filling separation layer zones; removing the grouting stopping wooden plugs after the separation layers are filled and the gas is completely extracted by the second ground gas drill holes; starting to grout and fill gobs; circularly extracting pressure relief gas of the follow-up ground gas drill holes in an integral coal mining working face and grouting and filling cover rock. The one-hole grouting and filling dual-purpose method has the advantages that the pressure relief gas is extracted while the cover rock is grouted and filled, accordingly, construction of special ground grouting drill holes can be omitted, the difficult problem of filled grout and gas flow interference can be solved, and problems in the aspects of gas extraction and earth surface subsidence control can be solved.

The invention discloses a water dispenser used water system leak detection device and method, which mainly adopt the flow interference detection method and a low-cost gas flow detection device consisting of a high-sensitivity gas flow detection pipe and a high-sensitivity induction detector, rather than a high-price precision flowmeter. When the fact that pressure gas for detecting a water system of the water dispenser enters the water system of the water dispenser and is balanced is detected, an air floater inside the gas flow detection pipe can drift as long as leakage exists in the water system of the water dispenser, the displacement of the floater can be detected by the induction detector immediately, and the detecting system locks a signal and alarms immediately.

A method of propagating a brake pipe braking command along a fluid carrying brake pipe (14) interconnecting members of a transportation system, the transportation system comprising a communication system (24) for exchanging information between a controlling member of the system and controlled members of the system includes identifying an unexpected brake pipe fluid flow condition at a first controlled member (e.g. 12) of the transportation system inconsistent with a communication system braking command issued by a controlling member of the transportation system. The method also includes disabling an ability of the first controlled member to control a brake pipe flow so that a brake pipe braking command issued by the controlling member is propagated along a brake pipe to a second controlled member of the transportation system downstream of the first controlled member with reduced brake pipe fluid flow interference from the first controlled member.

The invention provides a method for improving the power generation efficiency of a wind turbine unit. The method includes the steps that 1, statistical data of deviations delta theta nn generated by wind indicators, suffering from wake flow interference, under all wind speed sections vn and all impeller rotating speed sections omega n are measured; 2, the statistical data obtained in the step 1 are input into a database; 3, the current wind speed v and the current impeller rotating speed omega are measured, and the current wind direction theta' is measured; 4, according to the current wind speed v and the current impeller rotating speed omega measured in the step 3, the database is searched for the deviation delta theta generated by the wind indicators, suffering from wake flow interference, corresponding to the wind speed v and the impeller rotating speed omega, the actual wind direction theta is calculated according to the formula: theta=theta'-delta theta; and 5, the actual wind direction theta calculated in the step 4 serves as the actual wind direction to participate in wind turbine yaw control. Due to the fact that the wind direction deviations generated by the wind indicators, suffering from wake flow interference, at different wind speeds and different impeller rotating speeds are corrected, wind facing of the wind turbine unit is more accurate, the power generation efficiency of wind turbines is improved, and the power generation amount is higher.

The present invention claims a combined interference phase alignment solution based on Bayes estimation and inter-data flow power allocation. Firstly, optimal estimation of a current CSI is obtained by means of Bayes estimation, such that a sending end can obtain better CSI. Secondly, during forward communication, an interference suppression matrix is designed by maximizing a ratio of desired signal power to an inter-cell interference and noise power sum; during reverse communication, a pre-coding matrix is designed by maximizing an overall signal interference ratio of a receiving end; and the forward communication and the reverse communication are iteratively computed till convergence to obtain optimal pre-coding and interference suppression matrices. Then, a water injection power allocation solution applied to interference alignment is combined. Finally, inter-data flow interference is rotated into a signal space of a target receiving data flow by aligning phases of a sending signal flow and a receiving signal flow. Simulation shows that compared with other robust algorithms, the solution has a certain performance advantage in either ideal CSI or delay error CSI.

A system and method for regulating pressure inside a vehicle (“cabin pressure”) with reduced noise is disclosed. The system can include a forward gate and an aft gate that can be moved from a closed position to an open position to release cabin pressure in a controlled manner. The forward gate and the aft gate can comprise one or more flow disruptors. A first portion of the flow disruptors can be fixed and a second portion can be moveable between a retracted position and a deployed in position. In the retracted position the one or more flow disruptors can reduce broadband noise through the system by smoothing air flow therethrough. In the second position, the one or more flow disruptors can create boundary layer turbulence. The boundary layer turbulence can prevent, or delay, flow separation reducing tonal noises therethrough. In this manner, flow efficiency can be increased and noise reduced.

The invention provides a dust discharging and preventing as well as cooling device for inner hole plasma spraying. The device comprises an air draft dust-screening drum, an exhaust fan, a cooling air nozzle, a cooling air ring I and a support; a cylinder arranged on an upper side of the air draft dust-screening drum is communicated with the exhaust fan via an aluminum foil hose; a lifting mechanism is used to drive an inner hole spray gun to make vertical up and down movement with the air draft dust-screening drum and spray the inner wall of an inner hole workpiece fixed on a rotating mechanism; jet spots sprayed on the inner wall of the inner hole workpiece by the inner hole spray gun are externally locally reduced in temperature via the cooling air nozzle fixed on the cylinder; and open holes formed on the cooling air ring I blow cooling air to a gap to realize cooling and dust preventing for of the inner hole workpiece. The device can effectively reduce the temperatures of the inner hole spray gun and the inner hole workpiece in the inner hole spray process, ensure long-time work reliability of the inner hole spray gun and reduce coating heat stress on the inner wall of the inner hole workpiece and air flow interference and dust pollution of the inner hole workpiece.

A method of propagating a brake pipe braking command along a fluid carrying brake pipe (14) interconnecting members of a transportation system, the transportation system comprising a communication system (24) for exchanging information between a controlling member of the system and controlled members of the system includes identifying an unexpected brake pipe fluid flow condition at a first controlled member (e.g. 12) of the transportation system inconsistent with a communication system braking command issued by a controlling member of the transportation system. The method also includes disabling an ability of the first controlled member to control a brake pipe flow so that a brake pipe braking command issued by the controlling member is propagated along a brake pipe to a second controlled member of the transportation system downstream of the first controlled member with reduced brake pipe fluid flow interference from the first controlled member

An acoustophoresis device which includes a substantially vertical flow path of the fluid mixture in order to improve separation of particles / secondary fluid from a primary fluid is disclosed. The vertical flow path reduces velocity non-uniformities in the acoustic chamber resulting from gravity forces. The device includes an acoustic chamber in which multidimensional acoustic standing waves are generated. The fluid can be introduced into the acoustic chamber using a dump diffuser in which a plurality of inlets enter near the bottom of the acoustic chamber such that flow symmetry reduces both, gravity driven flow non-uniformities, and any flow interference effects between inlet mixture flow into the acoustic chamber and the continuous gravity driven particle cluster drop out.

A flat pipe with variable flow capacity comprises a main body shaped as a flat tube wherein opposing ridges are installed at the inner upper and lower positions of the main body, and thin-film spacers are installed between said pairs of ridges, forming multiple passages in the main body. Due to the flexibility of the thin-film spacers, the passages of the main body may stretch to a larger diameter to adjust to increased flow. If the flow is significantly enlarged, the main body will flex at the ridges causing the thin-film spacers to separate which in turn opens flow to the main body, essentially creating one main passage with a large diameter. When flow is stopped or decreased, the main body will restore elastically and resume shape as a flat pipe. According to the above, the present invention discloses a pipe which is easily stored and prevents twisting which could result in deformation, breakage and flow interference.

A flat pipe with variable flow capacity comprises a main body shaped as a flat tube wherein opposing ridges are installed at the inner upper and lower positions of the main body, and thin-film spacers are installed between said pairs of ridges, forming multiple passages in the main body. Due to the flexibility of the thin-film spacers, the passages of the main body may stretch to a larger diameter to adjust to increased flow. If the flow is significantly enlarged, the main body will flex at the ridges causing the thin-film spacers to separate which in turn opens flow to the main body, essentially creating one main passage with a large diameter. When flow is stopped or decreased, the main body will restore elastically and resume shape as a flat pipe. According to the above, the present invention discloses a pipe which is easily stored and prevents twisting which could result in deformation, breakage and flow interference.

The invention relates to a cloud computing network flow prediction method based on time sequence statistics segmentation, which comprises the following steps: carrying out time-phased resource occupation statistics on a virtual machine in a cloud computing network, establishing a Markov state model according to a statistical result, and carrying out network flow prediction in a next time period according to the model. Compared with the prior art, for non-periodic network behaviors, the method carries out time sequence data analysis and prediction on a network boundary bandwidth monitoring result, flow characteristics and time sequence trends of different services in the network are identified, and the possibility of network adjacent flow interference hidden troubles in a future period of time is judged, so that a resource adjustment strategy is optimized, and too frequent scheduling and adjustment are avoided.

The invention belongs to the field of adaptive optics and provides a method for measuring a response matrix of a liquid crystal corrector through a least square method. Zernike mode wave surfaces composed of large quantity of random coefficients are adopted in the method, the calculated wave surfaces are sequentially applied to the liquid crystal corrector, and light dot matrix slope data corresponding to the wave surfaces are sequentially detected through a Hartmann wavefront detector to form a measurement matrix. Furthermore, errors in measurement are eliminated through the calculation relation between the measurement matrix and a response matrix and the least square matrix method, and an accurate response matrix is obtained. Fiber optic bundle self-adaption correction imaging under turbulent flow interference is conducted through the response matrixes of conventional measurement and least square method measurement respectively. As shown in the figure, (a) is before correction, and (b) and (c) respectively correspond to imaging effects of the two methods before and after. It can be seen that the response matrixes measured through statistics in the least square method indeed enable imaging definition to be improved, and the crest of (c) is three times that of the (b) according to radial average power detection.

The present invention provides a heating device with cathode oxygen depletion (COD) function for a fuel cell vehicle, in which an existing COD and a heating device for improving cold startability of the fuel cell vehicle are integrated. For this purpose, the present invention provides a heating device with COD function for a fuel cell vehicle, the heating device including: a housing having an inlet and an outlet formed on both ends thereof; a start-up heater and a shut-down heater provided in parallel on one side of the housing in a direction perpendicular to a coolant flow direction; and a plurality of heaters for heating coolant provided in parallel on the other side of the housing in a direction perpendicular to the coolant flow direction, wherein cross sections in the coolant flow direction of each of the respective heaters change periodically along the longitudinal direction of the heater so as to cause a flow disturbance.

An atmosphere controlled, resealable foodstuff container includes a base tray and a cover. The cover and base tray are constructed of a substantially gas impermeable material. The cover and base tray include resealing members. When connected, the cover and base tray define a generally enclosed and sealed interior space for foodstuffs. The container includes at least one atmosphere control member, such as a membrane, which controls the flow of gases through an opening in the container. The member may be located over a recessed opening in the cover to permit the containers to be stacked without gas flow interference. A label extends over the recess, thus obscuring the membrane from view to the purchaser without affecting the membrane atmosphere control function. The base tray may be opaque for use as a serving tray and the cover transparent to permit viewing of the product.

An atmosphere controlled, resealable foodstuff container includes a base tray and a cover. The cover and base tray are constructed of a substantially gas impermeable material. The cover and base tray include resealing members. When connected, the cover and base tray define a generally enclosed and sealed interior space for foodstuffs. The container includes at least one atmosphere control member, such as a membrane, which controls the flow of gases through an opening in the container. The member may be located over a recessed opening in the cover to permit the containers to be stacked without gas flow interference. A label extends over the recess, thus obscuring the membrane from view to the purchaser without affecting the membrane atmosphere control function. The base tray may be opaque for use as a serving tray and the cover transparent to permit viewing of the product.

The invention relates to a rectilinear propulsion ship which comprises a ship body, wherein at least one group of rectilinear paddle driving device is arranged on the ship body; and in the rectilinear paddle driving device, at least two transmission wheels are connected through a rectilinear paddle belt, and a plurality of paddles are arranged on the rectilinear paddle belt. According to the rectilinear propulsion ship provided by the invention, a traditional propeller rotation water pushing way is changed to a rectilinear paddle type propulsion way, water-pushing speed and turbulent flow interference are reduced, the area of a propulsion device, which is in contact with water is expanded, and propulsion performance and energy conservation efficiency can be improved; furthermore, energy efficiency under various rotational speed and cruising speed conditions can be kept unchanged, large-scale energy conservation can be realized on the whole and endurance capability of an electric ship can be greatly improved.

The invention aims at providing a coaxial dual-electromagnetic fuel gas injection valve with the flowing sectional area adjustable. The adjustable gas injection flow is achieved through a dual-valve-element dual-electromagnet control structure. The air inflowing and flow guiding process is achieved through a bypass structure and a flow guiding cavity structure; valve element control and gas way control are achieved through actuator control, and a gas injection function is achieved; through cooperation of an external guiding structure, an internal flow guiding cavity and a pressure balancing groove, the perpendicularity of a valve element is guaranteed, stable and reliable work of gas flow is achieved, and the high responding speed is achieved; through a mixed gas inflowing mode of combining direct gas inflowing of an axial main gas groove and gas inflowing of circumferential gas supplementing holes, high flow is achieved, the gas supplying efficiency of an engine is effectively improved, and meanwhile gas flow interference can be avoided, so that gas way stability is achieved; face sealing and high reliability of the fuel gas injection valve are achieved through multiple annular strip structures between the valve element and a valve base.

An acoustophoresis device which includes a substantially vertical flow path of the fluid mixture in order to improve separation of particles / secondary fluid from a primary fluid is disclosed. The vertical flow path reduces velocity non-uniformities in the acoustic chamber resulting from gravity forces. The device includes an acoustic chamber in which multidimensional acoustic standing waves are generated. The fluid can be introduced into the acoustic chamber using a dump diffuser in which a plurality of inlets enter near the bottom of the acoustic chamber such that flow symmetry reduces both, gravity driven flow non-uniformities, and any flow interference effects between inlet mixture flow into the acoustic chamber and the continuous gravity driven particle cluster drop out.

The invention relates to an unmanned aerial vehicle which takes off and lands down vertically. The unmanned aerial vehicle has pneumatic arrangement of double bodies and remote duck wings, a power system of the unmanned aerial vehicle is composed of four propellers with tilting mechanisms, which are arranged in a 'Y'-shaped manner, variable wings based on flexible structures are adopted as wings of the unmanned aerial vehicle, and a control surface of the unmanned aerial vehicle is of a flexible seamless control surface structure. The unmanned aerial vehicle has the beneficial effects that dueto adoption of a tiltable multi-rotor wing system, vertical lifting and landing down are achieved, and a 'waste weight' caused by a useless power system is avoided in level flight; due to adoption ofthe power system between the two bodies, air flow interference between the propellers and the bodies is avoided; due to adoption of the double bodies, the body rigidity can be improved, and the bodyweight can be reduced; due to adoption of the remote duck wings, the lift coefficient of the whole vehicle is increased, the position of a pneumatic center is adjusted, the rigidity of the vehicle isimproved, and the weight of the vehicle is reduced; due to adoption of the self-adaptive wings based on flexible structures, the pneumatic appearances of the wings are at optimal states constantly; and due to adoption of the flexible seamless control surface, the wings and the control surface are in seamless connection, so that interference resistance is reduced.

The invention discloses a low-frequency heterodyne ineterferometer used for laser wavefront detection, which adopts an acousto-optic frequency shifter heterodyne point diffraction interference system, greatly increases spatial resolution, can detect high-frequency errors in laser wavefronts, and enlarges dynamic range of measurement. In addition, an acousto-optic frequency shifter is adopted for phase shifting, no mechanical movement occurs, and the system has certain resistance to vibration and air flow interference.

The invention discloses a novel testing and evaluating system for intelligent water supply equipment. The system comprises a reservoir, a water inlet pipeline, a water outlet main pipe, an outlet pipe network and a control center. Water inlet pressure is maintained by using a constant-pressure pump, and municipal pipe network water supply pressure is simulated; three branches with different range flowmeters are connected behind the water outlet main pipe according to the water consumption amount, so that the measurement precision is guaranteed; valves are arranged in front of and behind the flowmeters according to the size of pipe diameters; a ball valve is arranged on the pipe with a small pipe diameter and a butterfly valve is arranged on the pipe with a big pipe diameter; pipe resistance loss and floor height are simulated by using loss due to valves at the outlet branch pipes; the pipe resistance loss before water entering buildings is simulated by the ball valves; the floor height is simulated by the reducing valves, and the pipe resistance loss after water entering buildings is simulated by another ball valves; a water source container and a water return container are combined into the reservoir, a flow baffle plate is additionally arranged in the middle of the reservoir to prevent discharge flow and incoming flow interference, and the waste of water resources is avoided.

The invention discloses a ship host active-disturbance-rejection controller which is characterized in that a system is composed of the active-disturbance-rejection controller, an accelerator servo mechanism, a ship host mathematic model and a wind wave flow interference signal. The input end of the active-disturbance-rejection controller receives a speed setting signal which is compared with an actual speed signal, and after the signal is processed by the active-disturbance-rejection controller, the output end of the active-disturbance-rejection controller is connected with the input end of the accelerator servo mechanism and transmits an output control signal. The output end of the accelerator servo mechanism is connected with the input end of the ship host mathematic model. The output end actual speed is connected with the input end of the active-disturbance-rejection controller. The ship host active-disturbance-rejection controller overcomes the defect that the rotational speed control process of a ship host has uncertainty caused by nonlinearity, time variation and disturbance of the environment, the speed switching control process of the ship host is rapid and smooth, adjustment of an accelerator is small, and the high-precision speed can be achieved.

The invention aims at providing a coaxial gas injection valve with a floating valve seat and with the adjustable circulation section area. Through a double-valve-element and double-electromagnet controlled structure, the adjustable gas injection flow is achieved. Through a floating valve seat structure, the function that reverse leakage caused by unbalanced inner pressure and outer pressure of the gas injection valve is avoided is achieved, and work reliability of the gas injection valve is guaranteed. Through cooperation of an outer guiding structure, an inner flow guiding cavity and a pressure balance groove, perpendicularity of valve elements is guaranteed, stable work of gas flow is achieved, work is reliable, and the high response speed is achieved. The mixed gas inflow manner of direct gas inflow through an axial main gas groove and gas inflow through a circumferential gas supplementing hole, large flow is achieved, the gas supply efficiency of an engine is effectively improved, meanwhile gas flow interference can be avoided, and stability of a gas path is achieved. Through a multi-girdle structure between the valve elements and the valve seat, face sealing of the gas injection valve is achieved, and reliability is high.

The invention discloses an axial flow fan ventilation wall which comprises an axial flow fan with the diameter of D. The axial flow fan ventilation wall further comprises two to three fan sets. Each fan set is composed of a plurality of axial flow fans. Impeller shafts of the axial flow fans in the same fan set are adjacent and parallel to one another. All the impeller shafts in the same fan set are located on the same plane which serves as the set cardinal plane. An included angle of 7 degrees to 13 degrees is formed between the set cardinal planes of every two adjacent fan sets, wherein the axial flow fans in one fan set sequentially correspond to the axial flow fans in the other fan set one to one, the central distance between every two corresponding axial flow fans is X, and X is larger than or equal to 1.8D and smaller than or equal to 2.5D. By integrating a plurality of small axial flow fans into a set and making a plurality of sets matched to form a complete ventilation wall, the air flow output by the ventilation wall is just like the air flow output by a single large axial flow fan. The included angle is formed between every two adjacent fan sets, and therefore the air flow interference between the fan sets is effectively avoided, air flow is stable, and the rated working condition efficiency is improved.

Systems and methods for flow sensing in a conduit are provided. One system includes a flow disturber disposed in a flow conduit and configured to impart a flow disturbance to the fluid flow. The system further includes a plurality of flow sensors disposed in the flow conduit and responsive to flow characteristics in the flow conduit. The system also includes a frequency resolver configured to determine frequency information related to the fluid flow based on the flow characteristics. The frequency resolver uses one or more time sample windows to select data samples for use in determining the frequency information, wherein a length of one or more of the time sample windows is based at least in part on the flow characteristics. The system additionally includes a processor configured to determine a flow rate of the fluid flow in the flow conduit using the frequency information.

The invention relates to an anti-interference method of a synchronous clock device of an intelligent substation. Two layers of active defensive measures are taken to resist the network interference. The anti-interference method comprises the following steps that firstly, the number of messages with the same CRC is counted, whether the number is larger than a threshold value or not is judged, and if yes, the messages are shielded in the set time; secondly, messages with the same target MAC address are detected, the flow of the messages is counted, whether the flow of the messages is larger than the threshold value or not is judged, and if yes, the messages are shielded in the set time; shaking removing and overtime process are carried out on an input pulse per second to resist the electromagnetic interference, and the stability of time tick signals is kept. By means of the method, under the situation of electromagnetic interference and network flow interference, time tick precision of the synchronous clock device is kept, and the synchronous clock device can stably and reliably run.

A carburetor comprising four distinct features providing improved performance: A sculpted chamber comprising D-shaped configuration; a fuel flow interference needle multiply comprised with bevel zones; easily accessible needle advancement and retraction means; and a centrally disposed auxiliary fuel jet aperture emission site.