279 results about "Pressure response" patented technology

A multiple stage variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the multiple stage blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.

An expandable reamer apparatus and methods for reaming a borehole, wherein a laterally movable blade carried by a tubular body may be selectively positioned at an inward position and an expanded position. The laterally movable blade, held inwardly by blade-biasing elements, may be forced outwardly by drilling fluid selectively allowed to communicate therewith by way of an actuation sleeve disposed within the tubular body. Alternatively, a separation element may transmit force or pressure from the drilling fluid to the movable blade. Further, a chamber in communication with the movable blade may be pressurized by way of a downhole turbine or pump. A ridged seal wiper, compensator, movable bearing pad, fixed bearing pad preceding the movable blade, or an adjustable spacer element to alter expanded blade position may be included within the expandable reamer. In addition, a drilling fluid pressure response indicating an operational characteristic of the expandable reamer may be generated.

An airfoil and method of fabricating an airfoil including a first and a second side coupled together at a leading and a trailing edge and extending there between. The airfoil includes a plurality of first chord sections having a first chord length and extending outward from one of the first side or second side of the airfoil at the leading edge and a plurality of second chord sections having a second chord length and extending outward from the one of the first side or the second side of the airfoil at the leading edge. The leading edge including spaced-apart wave-shaped projections defining a waveform. The configuration defining a three-dimensional crenulated airfoil configured to facilitate desensitization of an airfoil unsteady pressure response to at least one impinging upstream generated wake or vortex by decorrelating spatially and temporally and reducing in amplitude an unsteady pressure caused by interaction of the airfoil with the upstream generated wake or vortex.

An electronic device can include: a pixel array layer disposed on a substrate and including a plurality of pixels, each of the plurality of pixels including a thin film transistor and an organic light emitting device; an encapsulation layer covering the pixel array layer; a shielding layer disposed on the encapsulation layer; and a touch sensing layer disposed on the shielding layer to sense coordinates of a touch input, in which the touch sensing layer includes a pressure response member for sensing a touch force of the touch input.

A water leakage monitoring system including a water leakage position estimator which includes a periodic data acquiring unit for fetching predetermined-period flow rate pressure data stored in a monitoring device, and for fetching a signal related to a flow rate change and pressure changes expecting a water leakage reaction time calculating unit for calculating a pressure reaction time lag between two pressure changes, a pressure propagation velocity estimating unit for estimating a pressure propagation velocity using the pressure reaction time lag and a distance between two pressure gauges located in a water distribution block stored in a pipeline network map data, and a flow rate change position estimating unit for receiving a signal related to the flow rate change, and estimating a flow rate change position using pressure propagation velocity and a flow meter and pressure gauge locating positions of the pipeline network map data.

The invention provides a method which uses transient online diagnosis coupling frequency response to position the leakage of natural gas pipeline, and relates to a natural gas pipeline failure detection and positioning method which can solve the problems that the existing method for detecting and positioning the leakage of the natural gas pipeline can not detect in real time, has long detection period, low positioning precision and high error report rate; real-time pressure value and real-time flux value are respectively collected at the upstream and downstream of the pipeline; the real-time downstream pressure value and the real-time flux value when the pipeline runs stably are reduced by the practical real-time pressure value and the practical real-time flux value at the downstream; if both of the two differences exceed the valve value, the leakage is considered to occur, otherwise the values are collected again; an excitation pressure wave is generated at the downstream end of the pipeline and the wave speed of the response wave of the excitation pressure wave is gained; according to the wave speed of the excitation pressure response wave and the time difference when the excitation pressure response wave is transmitted to the upstream and the downstream, the position of the leakage point is gained. The measurement and collection of the values are completed by normal equipments and the method can be used both in the built pipeline or pipelines under construction.

The invention discloses a dynamic driving environment human physiological characteristics and biomechanics test platform which mainly consists of a dynamic excitation system, a three-dimensional digital adjustable seat system, a three-dimensional adjustable driving mechanism and a human physiological characteristics and biomechanics test system. The invention can simulate the dynamic environment (vibration environment) of automobiles, which means to implement the stepless frequency conversion, the amplitude, the frequency fixation and frequency sweep vibration for the variable acceleration; simulate the posture operation of the automobiles in various driving environment; measure the human physiological character indexes of the human electromyography signals, the human arterial blood flow, the human blood pressure response, the human heartbeat number of a driver, etc., and the vibration response of every human part, the contact stress of a human-chair interface and the body pressure distribution of human buttock and back; study and comprehensively test the human physiological characteristics and the human biomechanics of the driving postures of different populations. Through the stimulation on a dynamic driving environment human physiological characteristics and biomechanics test system, scientific data required by the automobile human-machine interface design for populations with different shapes can be obtained.

A temperature independent pressure sensor for selectively determining pressure is provided. The sensor comprises a resonance sensor circuit, a pressure sensitive component disposed on the sensor circuit, and an electromagnetic field modulator. A temperature independent pressure sensor system comprises a resonance sensor circuit, a pressure sensitive component disposed on the sensor circuit, an electromagnetic field modulator, and a processor that generates a multivariate analysis of sensor response pattern that is based on a change in an environmental pressure of the sensor system. A method of detecting a pressure response pattern in a temperature independent manner is also provided.

The invention discloses a subcritical coordinative control method based on multiple model predictive control. The method comprises the following steps: determining a plurality of preset local prediction models according to a non-linear work condition range, as well as dynamic responses of main steam pressure and power of a subcriticla machine set; designing a controller for each local prediction model, selecting a control variable, and obtaining an output increment of each local prediction model through an interpolation formula; and during each control period, obtaining an actual control output increment according to an output increment of each controller in a weighing manner; and correcting a feed-forward channel. By adopting the method disclosed by the invention, control output during a transition period can be smoothed, as a result, load and pressure response characteristics of the machine set can be improved effectively; and the subcritical coordinative control method based on multiple model predictive control can adapt to large-scale change in work conditions.

A pressure relief system for detecting and abating an overpressure in a pressurized fluid. The system includes a pressure response assembly that has a pressure responsive member, such as a buckling pin, configured to buckle when a predetermined force is applied to the member. When the buckling pin buckles, a piston slides to expose an inlet to a communication path to an actuator assembly. The actuator assembly includes a pair of sliders that move from a retracted position to an extended position when pressurized fluid enters an actuator assembly housing. The sliders have a rack that turns a pinion when the sliders move from the retracted position to the extended position. The pinion is rigidly attached to a rotatable actuator shaft. Rotation of the actuator shaft causes a valve assembly to open or close to direct the pressurized fluid through an overpressure path.

The present invention relates to a method for real time mechanical imaging of a prostate with a transrectal probe. In the method, generating a composite two- and three-dimensional prostate mechanical image from a plurality of partial mechanical images extracted from pressure response data and a probe orientation data starts with examining the prostate by pressing a probe head pressure sensor array against it at various overlapping locations. Merging of partial mechanical images together is accomplished by analyzing an overlap between each subsequent and previous partial mechanical image. Finding the prostate is assisted with a supplemental pressure response data indicating the location of a sphincter known to be about 4-5 cm away from the prostate. Data processing is improved by including probe orientation data to further increase the accuracy and sensitivity of the method. The probe is equipped with a two-dimensional head pressure sensor array, a supplemental shaft sensor array and orientation tracking sensors including a three-axis magnetic sensor and a two-axis accelerometer sensor for calculating elevation, rotation and azimuth angles of the probe.

A method for determining the flow of an anode gas out of an anode sub-system. The method includes providing pressure measurements at predetermined sample times over a predetermined sample period and using the pressure measurements to calculate a slope of a line defining a change of the pressure from the beginning of the time period to the end of the time period. The slope of the pressure line is then used in a flow equation to determine the amount of gas that flows out of the anode sub-system, which can be through a valve or by system leaks.

The invention discloses a dual-mode train tail device and a control method of the dual-mode train tail device. The dual-mode train tail device is installed on the train tail portion, and is mainly used for comparing position information of the train tail portion and a line database which is preset in the dual-mode train tail device, judging the communication system of a locomotive device in a running zone of the dual-mode train tail device, and selecting the corresponding communication mode from preset communication modes according to the communication system of the locomotive device to carry out transmission; the locomotive device which corresponds to the dual-mode train tail device is used for carrying out integrity detection on the basis of the position information, sent by the dual-mode train tail device, of the train tail portion, sending a query request to the dual-mode train tail device, and sending an air exhaust instruction to the dual-mode train tail device on the basis of air pressure response information when air exhaust is needed. According to the dual-mode train tail device and the control method of the dual-mode train tail device, the defects that in the prior art, reliability is poor, real-time performance is poor, faults cannot be easily identified, and universality is poor can be overcome, and the dual-mode train tail device and the control method of the dual-mode train tail device have the advantages that reliability and real-time performance are good, the faults can be easily identified, and universality is good.

The invention discloses an accumulator internal resistance measuring method, which comprises the following steps: first, preparing four terminals with two for measuring and other two for supplying alternating current actuation current signal; second, letting pressure response signal of accumulator multiplied by the sine pressure signal of constant alternating current source in the analog multiplier; third, transforming the alternating current signal output of analog multiplier into direct current signal through low-pass filter circuit; forth, sending the magnified direct current signal into the modular transformation mode.

A pressure response fracture port tool and method for its use reliably provides a noticeable indication at surface to an operator as to when the flow port is opened. The tool includes an outer housing and a sliding sleeve which resides within the outer housing. The outer housing has a first and second set of flow ports. The inner mandrel moves between a first position and a third position to expose the flow ports to the wellbore. The first set of flow ports, with its smaller area relative to the second set of flow ports, creates a noticeable pressure increase or spike that can be observed at surface when exposed to the wellbore. The second set of flow ports creates a noticeable pressure drop when it is exposed to the wellbore.

The invention provides a bistable liquid crystal handwriting device comprising a first substrate layer, a first electric conducting layer, a mixing layer, a second electric conducting layer and a second substrate layer. The mixing layer comprises, by weight, 30%-95% of smectic A-phase liquid crystals and 5-70% of polymers. When a pointed pen is used for writing on the handwriting device, selective pressure responses are performed by the device. After the handwriting device is powered on, written content can be erased. The bistable liquid crystal handwriting device has the advantages of high contrast, low price, portability and the like, can display white or colored character fonts or patterns and can be cut into any shape.

A multiple stage variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers (114, 115) in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the multiple stage blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.

The present invention discloses a method for estimating a fracturing reformation volume of a shale gas horizontal well. The method comprises the following steps: performing, by a production gas well, a shut-in pressure recovery test; performing deconvolution processing on a pressure-yield material; transforming a deconvolution result into a pressure response by means of an integral; drawing a pressure difference curve and a pressure derivative curve on a double logarithmic plot; and performing conventional test well interpretation on a curve graph, to estimate a fracturing reformation volume of an artificial fractured gas reservoir. According to the estimation method, a technical problem of after-pressure evaluation of a shale gas horizontal well is resolved from a dynamic perspective. The method is a complementary technical means to fracturing reformation effect evaluation, and has characteristics of being rigorous in method, simple in application, and accurate and reliable in analysis result.

The invention discloses an effect target structure for measuring a peak value of an impact wave pressure of a movable target and a testing method, and belongs to the field of impact wave pressure testing. Specifically, the structure can be used for measuring the impact wave pressure of a blast field of the movable target. The structure mainly comprises a pressure response membrane installation substrate (1), a central body (2), a pressure response membrane (3), a cover plate (4), a pressure response membrane sealing groove (5), a pressure response membrane pressure leading hole (6), a bolt installation hole (7), a compression bolt (8), and a fastening connection hole (9). The invention also discloses a method for measuring the impact wave pressure and mean load of the movable target. According to the invention, the effect target structure is installed on the movable target for measuring the impact wave pressure in a target region, and obtains the impact pressure and mean load of six points in a 500mm*126mm region according to a deformation value of the pressure response membrane (3).