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9 results about "Slip velocity" patented technology
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Anti-skid brake control method and device, electronic equipment and storage medium
The invention relates to the technical field of aircraft brake control, in particular to an anti-skid brake control method and device, electronic equipment and a storage medium, and the method comprises the steps of firstly obtaining a first slip rate threshold value and a second slip rate threshold value; then determining a first slip speed interval, a second slip speed interval and a third slip speed interval according to the airplane speed, a first slip rate threshold value and a second slip rate threshold value, and adjusting bias voltage modulation stage output by adopting a variable parameter adjusting method according to the interval where the slip speed of the airplane wheel is located and the slip speed of the airplane wheel; then, the slip speed threshold output is adjusted according to the slip speed of the airplane wheel and a third slip speed threshold value, and the wheel speed change rate threshold output is adjusted according to the change rate of the wheel speed and a wheel speed change rate threshold value; and finally, the sum of the slip speed threshold output, the wheel speed change rate threshold output and the bias voltage modulation stage output is calculated, the braking torque of a brake is controlled according to the obtained sum, and the effect of improving the braking efficiency is achieved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method for testing friction characteristics of rubber
The invention relates to the technical field of rubber friction characteristics, and discloses a method for testing rubber friction characteristics, which comprises the following steps: preparing a rubber wheel according to sample requirements of a testing machine, additionally arranging a slip rate control device, controlling the rotating speed of the rubber wheel, and enabling the rubber wheel to freely roll and slip relative to a friction disc of the testing machine during testing. Test parameters including a slip angle, a load, a slip rate, a test distance and a test temperature are set, the equipment is operated to carry out friction test on each test working condition, and a sensor of the testing machine is utilized to automatically record related data. According to the invention, different slip speeds are realized by controlling the slip rate, the rubber wheel rolls while slipping, the contact area is not fixed at the same position, and the temperature of the contact area does not rise sharply, so that the temperature does not affect the test result.
Owner:GITI RADIAL TIRE (ANHUI) CO LTD
Method for testing and characterizing lateral sliding friction coefficient of tire
The invention discloses a method for testing and characterizing the lateral sliding friction coefficient of a tire, which comprises the following steps of: S1, warming the tire, and removing an oxide film on the surface of the tire to enable the temperature of the tire to reach the working temperature; and S2, applying a vertical load to the tire to enable the tire to roll freely, and performing quasi-steady-state side deviation on the tire at a set side slip angle loading rate to obtain a change curve of the lateral force and the aligning torque along with the side slip angle. According to the invention, the lateral slip state of the tire is approximately maintained in the whole course, the transition process from a linear region to a peak region in the lateral deviation movement of the tire is avoided, the influence of the slip speed and the tread temperature is coupled, the wear of the tire is reduced, and the test time is shortened; according to the characterization method, the change relation among the sliding speed, the tread temperature and the lateral sliding friction coefficient is visually presented through a thermodynamic diagram, and a visual basis is provided for research on the multi-factor coupling effect of the lateral sliding friction coefficient.
Owner:GITI RADIAL TIRE (ANHUI) CO LTD
Method for predicting flow blockage of multi-scale particles in pump
The invention discloses a method for predicting flow blockage of multi-scale particles in a pump. According to the method, pump body unit flow channels are reconstructed for a pump body grid, a complete pump flow field is mapped, an expansion domain is constructed around a CFD unit, the space relation between particles and the expansion domain is recognized, the intersection volume is calculated, and therefore parameters such as local porosity, the specific surface area and the slippage speed are obtained. A structural blockage coefficient is established based on a Kozeny-Carman model, a dynamic blockage coefficient is formed in combination with a dimensionless slip velocity, and finally, a total blockage index is obtained to be used for judging the blockage risk. The method can accurately identify the particle blocking position and degree in the pump, and is suitable for operation analysis of various solid-containing pumps.
Owner:GENERAL MASCH KEY CORE INFRASTRUCTURE INNOVATION CENT (ANHUI) CO LTD +2
System and method for measuring gas-liquid two-phase slip velocity of unsteady cavitation flow
The invention provides a system and a method for measuring the gas-liquid two-phase slip velocity of an unsteady cavitation flow, and belongs to the technical field of complex multiphase flow measurement. Comprising a venturi type experiment section and a gas-liquid two-phase synchronous imaging velocity measurement system, and the venturi type experiment section adopts a modular structure in which a main body frame and a transparent plug-in are combined. The synchronous imaging velocity measurement system generates sheet laser through a double-pulse laser, realizes synchronous independent imaging of a gas-phase structure and liquid-phase tracer particles by combining four CCD (Charge Coupled Device) cameras and an optical filtering and density filtering technology, and reconstructs a three-dimensional transient velocity field of a gas phase and a liquid phase based on a stereoscopic vision principle. And on the basis, performing space-time alignment calculation on the two-phase velocity field to obtain transient distribution of the gas-liquid two-phase slip velocity in the unsteady cavitation flow. According to the invention, the gas-liquid two-phase slip velocity of the cavitation flow can be directly measured, and reliable experimental data can be provided for the correction of a cavitation numerical model.
Owner:JIANGSU UNIV
Method for predicting macroscopic friction coefficient of tire based on micro-friction performance of tread rubber
This invention discloses a method for predicting the macroscopic friction coefficient of tires based on the microscopic friction properties of tread rubber, belonging to the field of tire friction coefficient prediction technology. The method first obtains the shape and pressure distribution of the tire contact patch through experiments or simulations, establishing a three-dimensional complex contact patch model considering longitudinal grooves. Then, by conducting friction tests on tread rubber blocks, a microscopic friction model is established to show how the friction coefficient varies with contact pressure and slip velocity. Next, the slip velocity distribution within the contact patch is calculated, and combined with the contact pressure and the microscopic friction model, the friction coefficient at each point within the patch is determined. Finally, by integrating the stress over the entire contact patch area, the longitudinal dynamic friction coefficient of the tire is obtained, achieving accurate prediction from the microscopic properties of the tread rubber material to the overall macroscopic friction coefficient of the tire. This invention improves prediction accuracy, shortens the development cycle, and provides an effective tool for tire design and virtual vehicle matching.
Owner:HENAN UNIV OF SCI & TECH
Anti-skid brake control method and device, electronic equipment and storage medium
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Targeted tracer injection with online sensor
The invention is a method, a system, tools for use by the system, and an interpretation method for injecting and detecting tracers and conducting flow characterizing of a petroleum well. The method describes monitoring of travel time and slip velocity between two / three different phases (oil / water and possibly gas) in the well. The travel time and slip velocity are determined using an injection too for injection of an over pressurized injection of the partitioning tracers each of which would follow certain phase. The tracers are detected by an optical detection probe in the pipe. The slip velocity is obtained from the difference of travel time of two tracers which partition to two different phases.
Owner:RESMAN TECHNOLOGY AS
Friction clutch joint spline wear determination method, device, equipment, medium and product
The invention discloses a friction clutch joint spline abrasion determination method and device, equipment, a medium and a product, and relates to the field of mechanical transmission. The method comprises the steps that engine parameters, clutch parameters, load parameters, lubricating oil parameters, geometric parameters and spring parameters are obtained; according to the engine parameters, the clutch parameters, the load parameters, the lubricating oil parameters, the geometric parameters and the spring parameters, coupling iterative calculation is carried out by utilizing a joint process kinetic equation of a plurality of friction pairs of the clutch, and the time-varying friction torque and the time-varying slip speed of a joint spline are determined; and according to the time-varying friction torque and the time-varying slip speed, determining the abrasion loss of the tooth surface of the joint spline by utilizing a joint spline abrasion calculation model. According to the method, the accuracy of joint spline abrasion loss calculation can be improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1