58 results about "Slip factor" patented technology

The invention provides a well test analysis control system for a low permeability gas reservoir and a method thereof. The method comprises the following steps: measuring bottom hole pressure value of a gas well in a period after well startup to obtain a relation value between pressure difference and time; judging whether the relation value equals a preset relation value, if yes, performing the next step, or correcting well test interpretation parameters corresponding to the preset relation value; taking the well test interpretation parameters corresponding to the preset relation value as the well test interpretation parameters of the gas well; analyzing gas permeation situation of the gas well according to the well test interpretation parameters so as to control exploitation of the well gas; wherein, the well test interpretation parameters comprise gas slip factor, low level permeability, skin factor, well bore storage coefficient, flow coefficient and formation pressure. The well testinterpretation according to the method perfectly accords with actual condition of the gas reservoirs, accurately describe the gas reservoirs, and provide a reference for determining production system.

Techniques are provided for tuning a rotary positive displacement pump. The techniques include apparatus featuring a signal processor configured to the present invention may take the form of apparatus comprising a signal processor that may be configured to receive signaling containing information about actual pump performance data related to the operation of a rotary positive displacement pump; and determine corrected published pump performance data to operate the rotary positive displacement pump by compensating published pump performance data based at least partly on the actual pump performance data. The corrected published pump performance data may include a corrected published rated power, flow and slip factor, and the actual pump performance data contains information about actual power, specific gravity and viscosity related to the operation of the rotary positive displacement pump and received from a pump controller or controlling device, including a variable frequency drive.

The invention discloses a control method of tandem cold rolling mill emulsion section cooling, comprising the following steps: a. collecting the device parameter of a rolling mill and the key parameter of band steel to be rolled; b. collecting a technological lubrication institution parameter; c. giving emulsion section cooling flow distribution initial value and iteration precision; d. calculating corresponding work roll thermal crown; e. calculating the lateral distribution value of a slipping factor; f. comparing the slipping factor maximum value with a critical value; g. calculating the lateral distribution value of a slip injury index; h. comparing the maximum value of the slip injury index with the critical value; i. calculating the corresponding strip shape distribution value; j. calculating the function value of a strip shape objective function; and k. judging whether Powell condition is available, and obtaining the control curve of the optimal section cooling flow. The control method of the invention combines device section condition with practical flow control precision to set the emulsion flow in sections, reduces problems of slipping, hot slip injury and the like caused by lubrication and ensures the strip shape and the surface quality index of chassis outlet strip steel rolled stock.

A method for setting the concentration of the emulsion in the ultra-thin strip rolling of a five-stand cold tandem rolling unit, comprising the following steps executed by a computer: 1. Collecting the main equipment of the unit, the characteristics of the strip to be rolled, the main rolling process and Process lubrication system parameters; 2. Define relevant process parameters; 3. Calculate roll bending force and roll shifting amount; 4. Assign values ​​to relevant search process parameters; 5. Calculate concentration process parameters; 6. Calculate search process speed of maximum rolling speed; 7. Calculate the friction coefficient of each stand under the current conditions; 8. Calculate the rolling force, rolling power, slip factor, thermal slip index and vibration coefficient of each stand under the current conditions; 9. Calculate the working roll of each stand Thermal convexity; 10. Calculate the outlet plate shape and pressing width; 11. Obtain and output the optimal ratio concentration. The invention can increase the rolling speed, ensure the rolling efficiency, avoid slipping, thermal slipping and vibration, and ensure the minimum shape of the end stand exit and the pressing width of the work roll end.

The method involves detecting a slip factor based on a rotational speed of a driven wheel, and detecting the motor torque, where the slip factor is detected as an alteration of pedal rotation speed over a turning rate sensor at the driven wheel. A pedal rotational torque is detected (130), and a drive unit is controlled based on the detected slip factor. A sum of the motor torque and the pedal rotational torque is controlled based on the detected slip factor. The slip factor is compared with a threshold value, and a slippage state of the driven wheel is determined based on the comparison. Independent claims are also included for the following: (1) a control device for a pedal-driven vehicle (2) a pedal-driven vehicle.

The invention discloses a method for determining slip factors of a centrifugal pump on the basis of internal flow measurement under all conditions. The method includes measuring internal non-steady flow laws of the centrifugal pump under different conditions by PIV (particle image velocimetry) experiments; obtaining an average slip speed of an outlet of an impeller of the centrifugal pump under the different conditions by an arithmetic method on the basis of absolute speed distribution obtained by the PIV experiments and computing slip factors of the centrifugal pump under the different conditions; computing angle factors of liquid flows of the centrifugal pump under the different conditions; performing PIV measurement for internal flow of the centrifugal pump at different specific speeds to obtain angle factors of liquid flows at different specific speeds and under different conditions; and creating relation between the angle factors of the liquid flows and the specific speeds under the different conditions by unary linear regression so as to determining a computational formula of the slip factors of the centrifugal pump under the different conditions. The method has the advantages that the slip factors of the centrifugal pump under the different conditions can be accurately computed, and energy conservation transformation for an existing pump can be carried out by a centrifugal pump energy and performance computational formula created on the basis of the method.