38 results about "Pressure jump" patented technology

The invention relates to a method for determining the zones of a stratified porous medium whose physical properties are known, wherein the front or interface between fluids in place and injected flushing fluids moves in a stationary manner, without using a complete flow simulation. Starting from an a priori defined front form which separates two zones of uniform saturation, assumed to have a stationary displacement, the pressure field is determined independently in each zone. The pressure jump on either side of the front is then evaluated for any point of the interface. If it is zero, the form of the front is such that it can move in a stationary manner in the medium. If the pressure jump is not zero, the user deforms the interface and resumes the process until a stationary form is obtained. This process may not converge. In this case, we consider that a stationary front cannot form through the total thickness of the medium and the medium is divided so as to seek solutions in intermediate zones.

The invention provides a resistance-reducing technology mainly based on gas cushion resistance reduction. The resistance-reducing technology is characterized by installing resistance-reducing outer cover devices on the outer surfaces of parts, in contact with water bodies, of torpedoes, submarines and high speed surface ships. Gas jet-type resistance-reducing outer covers (1) are installed on the outer surface of the most front rectifying cone area of a torpedo and a submarine or all the outer surface of a torpedo body and a submarine body, and the front portion, the front lower portion and all the surface of the part below the water surface line of a high speed ship. The working gas of the gas jet-type resistance-reducing outer covers is provided by a pressure-jump booster fan (6) arranged in the torpedo body, the submarine body and the ship body or at the upper portion of the ship surface or a special gas yield engine (30) capable of generating high temperature and high pressure gas, or is provided by gas jet of a main engine of the torpedo and the submarine.

The invention relates to an anti-oxidation program controlled accurate loading experiment device and method for super-plasticity free bulging through photoelectric measurement. The device is mainly composed of anti-oxidation heating / loading systems I and II, a pole height photoelectric measurement system and a cooling system. The anti-oxidation heating / loading system I is a positive-pressure loading system, and the anti-oxidation heating / loading system II is a back-pressure loading system. Each of the two heating / loading systems is composed of a pure high-pressure argon source, a furnace outside heating and loading gas channel with pressure and temperature measurement and control functions and a control system. Non-oxidation heating can be performed on specimens through cooperation of the two anti-oxidation heating / loading systems, and loading modes such as constant pressure, pressure jump and superimposed back pressure can be achieved. Non-contact measurement is performed on the pole height of a bulging part through the photoelectric measurement system. Members required to be cooled are subjected to circulating cold water cooling through the cooling system. By means of the device, non-contact measurement of the pole height of the bulging part is achieved, specimen high-temperature oxidation can be effectively prevented, and the device and method have the advantages of being high in pressure adjusting accuracy, fast in response, safe and reliable in experiment process and the like.

The invention provides a pipeline leakage positioning method based on fuzzy reasoning. The method comprises collecting pressure signals and temperature signals of the head end and the tail end of a pipe line in real time; calculating time difference of pressure jump signals reaching the tail end and the head end of the pipeline if the pipeline has a leak point since the pressure jump signals caused by non-condition adjustment exist among the pressure signals of the two ends of the pipeline collected in real time; obtaining the distance between the pipeline leak point to the head end of the pipeline by utilizing a suction wave method, a generalized recurrent neural network positioning method and a temperature gradient method; positioning the leak point by utilizing a fuzzy reasoning algorithm and utilizing the distance between the pipeline leak point and the head end of the pipeline obtained by utilizing the suction wave method, the generalized recurrent neural network positioning method and the temperature gradient method. The three different positioning methods are adopted for positioning the pipeline leak point and different confidential coefficients are given for the three positioning results through fuzzy reasoning and parameter adaptive optimization of a subordinating degree function of a fish swarm algorithm, so that precise positioning of the leak point is realized.

The invention discloses an energy feedback shock absorber with damping stiffness changing along with a road condition. The energy feedback shock absorber adopts a combined piston structure, through the combination of a first bent circuit throttle oil way and a second bent circuit throttle oil way, oil liquid in the upper cavity of a cylinder barrel is connected with a hydraulic system through the first bent circuit throttle oil way and the first oil way of a piston rod, oil liquid in the lower cavity of the cylinder barrel is connected with the hydraulic system through the second bent circuit throttle oil way and the second oil way of the piston rod, pressure oil flow circulation generation is realized, and the vibration energy of the shock absorber is converted into storable electric energy; a gas bag arranged at the bottom of the cylinder barrel is communicated with an oil-gas separation pressure balance type energy accumulator gas cavity, the volume of the gas bag is increased or decreased through the elastic deformation of the gas bag, and the problem that the changes for the volumes of the upper cavity and the lower cavity of the cylinder barrel are unequal when the piston slides is effectively solved; a control device appropriately delays the opening time of a related electromagnetic check valve according to pressure jump feedback obtained by a first pressure sensor and a second pressure sensor, and the adaptive control that the damping stiffness of the shock absorber changes along with the road condition is realized, so that the frequency and amplitude of vibration between a frame and an axle is reduced, and the frame can be effectively protected from being damaged.

The invention discloses a volatile communication structure for end furnace chambers of a carbon secondary roasting furnace. The structure comprises the carbon secondary roasting furnace; both ends of the carbon secondary roasting furnace are provided with a volatile communication device; and ends of various bins of the end furnace chambers are provided with bin volatile passageways, and volatile passageway branch pipes used for connecting the volatile communication device and the bin volatile passageways. The structure has the advantages that the structure can make volatile produced in the bins of a downstream furnace chamber collected into the volatile communication device under the condition of basically same negative pressure and resistance. The condensation phenomenon of the volatile cannot appear in a pipeline, and the smoothness of the flow of the volatile is ensured during the operation across the central line of the furnace. The temperature of the furnace chambers and the binsin a flame system has even distribution, which is favorable for improving the quality of secondary roasting. The structure effectively avoids the pressure jump in the related bins, and is favorable for guaranteeing the personal safety of operation personnel.

The invention relates to a seabed natural gas hydrate slurry decomposition separation and silt removal modular mining system, which comprises a seabed excavating robot, a seabed decomposition separation and siltremoval gathering and transportation treatment station, an offshore mining operation platform and a seabed silt backfilling robot, wherein the seabed decomposition separation and silt removal gathering and transportation treatment station realizes fast connection with the seabed excavating robot, the offshore mining operation platform and the seabed silt backfilling robot through an integrated passage and fast plugs; devices in the gathering and transportation station are connected with fast sockets arranged on the inner wall of a sealed cabin through the fast plugs; the hydrate slurry is stored, decomposed and separated; the separated hydrate slurry is conveyed to an offshore platform; the separated silt is backfilled in situ by the seabed silt backfilling robot. The system has the beneficial effects that the problems of great energy consumption in the conveying process of directly lifting silt-containing slurry, easy occurrence of sand blockage in the pipeline conveying process, pipe explosion due to pressure jump in the pipeline and the like are solved; fast connection, operation and maintenance can be conveniently realized among the modules.