75results about How to "Reduce dynamic pressure" patented technology

Fuel is conveyed by at least one high-pressure pump from a low-pressure region into a high-pressure region including a pressure-accumulator line consisting of at least two separate accumulator units connected to one another by means of feed lines, and to fuel injectors for the cylinders. The accumulator units each have an accumulator volume for serving at least two cylinders, and accumulator covers provided on both end faces. All the functional units are integrated into these accumulator covers in terms of fuel delivery and transfer, and at least one separate pump accumulator is arranged in the high-pressure region between the high-pressure pump and the assembled pressure-accumulator line. The pump accumulator is connected to at least one accumulator cover of an accumulator unit of the pressure-accumulator line for fuel conveyance and is capable of being acted upon by at least one high-pressure pump.

Fuel is conveyed by at least one high-pressure pump from a low-pressure region into a high-pressure region including a pressure-accumulator line consisting of at least two separate accumulator units connected to one another by means of feed lines, and to fuel injectors for the cylinders. The accumulator units each have an accumulator volume for serving at least two cylinders, and accumulator covers provided on both end faces. All the functional units are integrated into these accumulator covers in terms of fuel delivery and transfer, and at least one separate pump accumulator is arranged in the high-pressure region between the high-pressure pump and the assembled pressure-accumulator line. The pump accumulator is connected to at least one accumulator cover of an accumulator unit of the pressure-accumulator line for fuel conveyance and is capable of being acted upon by at least one high-pressure pump.

A personal watercraft has a jet pump propulsion device. An engine powers the propulsion device and a control device controls engine speed. A steering mechanism steers a thrust direction of the propulsion device. An engine load sensor or an engine speed sensor senses an engine load or an engine speed, respectively. A steering position sensor senses an angular position of the steering mechanism. The control device decreases engine speed when the engine load or the engine speed is greater than a preset engine load or the engine speed, respectively, and the angular position of the steering mechanism is greater than a preset angular position.

The invention belongs to the field of drilling leakage prediction and the field of artificial intelligence machine learning, and particularly relates to a drilling leakage probability prediction method based on a naive Bayesian algorithm. The method comprises the following steps: extracting oil reservoir historical development data from an oil reservoir well history database of a certain oil reservoir development area, preprocessing the oil reservoir historical development data, creating a sample set and a test set, determining characteristic attributes and an output category space from the sample data, and counting the prior probability of each characteristic attribute value according to drilling leakage parameter data of the sample set; calculating conditional probabilities by adopting priori probability learning, calculating by adopting different conditional probabilities when feature attribute values are continuous values and discrete values, calculating corresponding conditional probabilities by selecting a mode of combining every two features to improve the generalization performance of the model, jointly calculating posteriori probabilities by adopting the priori probabilities, and establishing a naive Bayesian model classifier; performing verification by adopting the verification set, and inputting the real-time drilling parameter data into the model to obtain the corresponding leakage probability.

This invention discloses a film lubrication method for thrust bearing roller cone races and ribs, which forms a wedge clearance between the large end surface of a roller and inside wall of a ring rib and fills it with lubrication oil, when the shape, size of the clearance and axial load, glide speed and viscosity of the oil are matched to each other, a dynamic pressure film is formed between the two surfaces, in which the wedge clearance is formed by cone roller spherical large end surface and the ring rib spherical ring, so it's easy to form a dynamic pressure film by selecting race SRQ of the inner surface of the race and axis ring and srq of the cone large end surface reasonably.

The invention provides an under-floor air supply data center refrigeration system. The under-floor air supply data center refrigeration system comprises two rows of cabinets, the air inlet ends of which are arranged in a face-to-face manner; air return devices, which are connected with the air outlet ends of the cabinets; air return ducts provided with built-in heat exchangers; a machine room elevated through hole floor; and a cooling channel formed by the cabinets, a channel door, the elevated through hole floor, and a top part closing plate in an encircled manner. The hot air exhausted by the air outlet ends of the cabinets are delivered by the air return devices to the heat exchangers for cooling. The heat exchangers are disposed in the air return ducts, and one side of each of the air return ducts is connected with the corresponding air return device, and the other side of each of the air return ducts is connected with the lower part of the elevated through hole floor. The cooled air enters the lower part of the floor, and is delivered to the cooling channel by the through hole floor after being mixed and stabilized. The cool air in the cooling channel is sucked in by the cabinets, and then is exhausted by the cabinets to complete heat dissipation circulation. The under-floor air supply data center refrigeration system is advantageous in that energy loss of a draught fan on an end of an air conditioner is saved, and problems of common under-floor air supply systems such as non-uniform air supply in the length direction of the cooling channel, two fast bottom air supply speed, small air inlet quantity of servers on the lower parts of the cabinets, and easy generation of local hot spots are improved, and therefore the internal temperature of the cabinets is reduced, and the integrated heat dissipation efficiency of the cabinets is improved.

A viscoelastic polisher to be used for polishing. The viscoelastic polisher includes a viscoelastic layer provided on a major surface of a base disk and having a hole of a predetermined radius formed in a center portion thereof, and the base disk has a plurality of grooves equiangularly provided in the major surface thereof as extending radially outward from a center portion thereof. This arrangement ensures stable supply of an abrasive liquid, and obviates a need for formation of grooves in the viscoelastic layer.

The present invention provides wind flow bodies for use with a structure for decreasing the carrier wing effect on the structure by the formation of turbulence or reducing the dynamic pressure by deflecting the wind flow. The invention further provides a method for securing the composition of a structure against the onslaught of heavy winds, whereby zones, which are suitable for the formation of a critical carrier wing effect during heavy wind flow are identified on the structure, and the position of a wind flow body for generating turbulence for dampening the carrier wing effect, is then determined. Further zones are identified which are suitable for the formation of the dynamic pressure, and the operating position of a wind flow body is then determined for deflecting the corresponding wind flow for reducing the dynamic pressure.

The invention discloses a fleet management system. A fleet comprises one core vehicle and a plurality of team vehicles, wherein the core vehicle and the team vehicle are each provided with an OBD system, a V2V communication unit, a storage unit, a distance sensor and an execution unit, the core vehicle is further provided with a control unit, the V2V communication units communicate in a broadcasting manner among vehicles, on the one hand, the team vehicle receives a scheduling instruction form the core vehicle, on the other hand, the team vehicle transmits an equipment parameter and oil consumption condition to the core vehicle, the control unit of the core vehicle calculates an optimal distance between vehicles and load of the fleet, so that the fleet proceeds by a shortest vehicle distance, so as to reduce wind resistance loss and balance overall load of the fleet.

A prosthetic heart valve either of the mechanical type or the bio prosthetic type, comprises a tubular or cylindrical frame element, a plurality of injectors, a suturing member surrounding the tubular or cylindrical frame element, tether lines to secure the device during diastolic filling but more predominantly during systolic contraction that creates a vortex effect with externally supplied pressurized fluid injected angularly within a transport structure is provided. Such a unit is utilized to accelerate the hemodynamics, reduce the energy required for said transport or both. The annular frame is designed to allow a passageway for blood flow and regulating flow during systolic contraction. Such a result is achieved through the introduction of pressurized fluid (blood) via a plurality of injectors situated evenly around the circumference of the subject tubular or cylindrical unit, and angled uniformly for an even pressure injection of fluid within the conveyance component thereof.

A lifting foil having a lower trailing course having a margins and an upper leading course margins connected in a manner to enhance lift of the foil.