12 results about "Viscosity coefficient" patented technology

This invention provides a method for detecting the spinnability and uniformity of spandex spinning dope. The method involves performing steady-state and dynamic tests on the spandex spinning dope to obtain its non-Newtonian index, viscosity coefficient, yield stress, maximum stress in the linear viscoelastic region, and maximum strain. Analysis of these test results yields a determination of whether the spandex spinning dope possesses excellent spinnability and uniformity. This method offers the advantages of rapid detection and accurate results. Spandex spinning dopes that pass this method exhibit minimal gelation during storage and excellent fluidity. During spinning, they show minimal yarn breakage and snagging, and a low probability of malfunctions, demonstrating excellent spinnability and uniformity.

The application discloses a viscoelasticity parameter inversion method, and belongs to the field of medical image processing and computational imaging. The method obtains the time-space image sequence data of the measured soft tissue after excitation, extracts the shear wave group velocity by using the time-of-flight method, and equivalently takes the shear wave group velocity as the phase velocity anchor point under the zero-frequency limit condition to determine the static shear modulus; the two-dimensional fast Fourier transform is used to extract the middle-high frequency band phase velocity dispersion curve; the rheological model of the measured soft tissue is constrained based on the static shear modulus, and the single-parameter fitting of the viscosity coefficient is combined with the middle-high frequency band phase velocity dispersion curve to obtain the viscoelasticity parameter.

An electronic system is provided, including a memory, a coating path planning processor, and a spraying apparatus. The spraying apparatus sequentially coats adhesive onto a surface. The coating path planning processor receives a mode selection signal and a first adhesive weight, coating height, coating order, viscosity coefficient, and surface tension coefficient from the memory. Based on the mode selection signal and the coating order, a path length is calculated starting from at least one of at least three nodes. A second adhesive weight is calculated based on the coating height, coating order, viscosity coefficient, surface tension coefficient, and path length. When the second adhesive weight is not equal to the first adhesive weight, the coating order is adjusted. When the second adhesive weight equals the first adhesive weight, a planning result representing the end of path planning is generated, and a sequence is generated based on the planning result and an optimization judgment signal.

This invention discloses an optimized method and system for preparing silicone gel for acne scar repair, relating to the field of silicone gel preparation technology. The method includes obtaining physicochemical indicators such as the viscosity coefficient, refractive index, and volatile content of silicone raw materials; using a rheological prediction model to calculate the expected viscosity change curve of the silicone raw material mixing process under the current reactor temperature field; comparing this curve with a process window threshold; if the curve exceeds the threshold, triggering a gradient temperature adjustment strategy and recalculating until the curve falls within the threshold; after determining the temperature adjustment strategy, introducing a state inversion algorithm to output the dispersity parameter of the initiator addition stage based on the crosslinking density index of the target product; and dynamically adjusting the stirring rate and the timing of dispersed phase addition according to the dispersity parameter to complete the preparation. This method enables precise control of the preparation process, improves product quality stability, and meets the performance requirements of silicone gel for acne scar repair.

The present application relates to the technical field of power equipment fault diagnosis, and discloses a kind of oil-immersed transformer fault diagnosis method, including synchronous acquisition transformer's operating phase voltage discrete sequence, load current discrete sequence, top oil temperature discrete sequence and box wall acceleration sequence;In light load steady state condition, identify transfer function parameter matrix, reconstruct core vibration reference component in dynamic condition and difference extraction winding vibration component;Relative viscosity coefficient is calculated using top oil temperature to dampen winding vibration component;In load transient time window, extract excitation force characteristics, macroscopic displacement characteristics and high-frequency distortion rate characteristics, map to three-dimensional state space, calculate space distortion volume and compare with reference threshold, output diagnosis result.The present application reduces the damping influence of core background vibration interference and oil temperature fluctuation, quantifies multi-source nonlinear degradation characteristics into volume index, and improves the recognition ability of early micro loose state of transformer winding.

Embodiments of the present disclosure provide a wind farm wind speed profile modeling method, device and equipment and storage medium, relating to the technical field of wind farms, comprising: representing the vertical momentum flux of the momentum equation as the vertical gradient form of the average wind speed, constructing the ordinary differential equation of the wind speed changing with the height, integrating the ordinary differential equation to construct the initial wind speed profile model; constructing the total eddy viscosity coefficient based on the environmental turbulence eddy viscosity coefficient and the wind farm additional eddy viscosity coefficient; based on the semi-infinite wind farm assumption, performing momentum analysis at the hub height of the wind turbine to construct the dynamic correction function of the integral constant; correcting the eddy viscosity coefficient of the initial wind speed profile model by using the total eddy viscosity coefficient, correcting the integral constant of the initial wind speed profile model by using the dynamic correction function of the integral constant, and obtaining the wind farm wind speed profile model. The present application can improve the model precision.

The application discloses a k-epsilon turbulent flow model enhanced mixing correction method suitable for air film cooling, provides a mixing function C for describing two different state fluids for the k-epsilon turbulent flow model m , so as to improve the fluid mixing prediction situation of the mixing area of the two fluids, and corrects the mixing function C m of the turbulent flow viscosity coefficient μ of the different mixing degree areas t , realizes the correction of the different mixing intensity areas of the two fluids, and improves the numerical prediction accuracy of the air film cooling efficiency mixing area.

The application discloses a rock creep constitutive model construction and application method, device, equipment and medium, relates to the rock mechanics numerical simulation technical field, and the method comprises the steps of taking the CVISC model as a basic framework; driving the creep damage coefficient and the viscosity coefficient to evolve in time through the rock failure time and the damage process correlation coefficient, constructing a creep damage mechanism, and introducing the creep damage mechanism into the basic framework; controlling the rock elastic modulus and the viscosity coefficient reduction driving creep strain increment increase through the water content, constructing a water damage unit, and introducing the water damage unit into the basic framework; determining the water influence range according to the geometric characteristics of the rock internal defects and generating a non-uniform water content field, coupling the non-uniform water content field to the water damage unit as an input parameter; and numerically simulating the nonlinear creep damage evolution process of the rock. The application can improve the prediction ability of the long-term deformation and damage process of the rock.

This invention relates to the field of industrial equipment automatic control technology, specifically to a method for coordinated speed adjustment in pear juice centrifugation for impurity removal based on a fuzzy PID algorithm. The method includes: acquiring multi-dimensional parameters of the feed pipe section; calculating the equivalent flow resistance viscosity coefficient using Hagen-Poiseuille's law; calculating the turbidity deviation and deviation change rate based on a fixed process target turbidity and real-time discharge turbidity; using the equivalent flow resistance viscosity coefficient as a feedforward correction factor; performing fuzzy inference and defuzzification processing in conjunction with the turbidity deviation and deviation change rate; outputting the compensation amounts for the proportional gain and integral gain of the PID controller; generating speed adjustment commands through incremental proportional-integral calculations; and performing safe speed coordinated adjustment in conjunction with the centrifuge current and actual speed. This method achieves adaptive matching between centrifuge speed and operating conditions, improving the stability and impurity removal effect of centrifugation.

This utility model relates to a vibration-damping support platform for multi-axis linkage machining of aerospace parts, including a base frame. A vibration-damping component is mounted on the top of the base frame, a connecting plate is fixedly mounted on the top of the vibration-damping component, a multi-axis linkage is fixedly mounted on the top of the connecting plate, and a support platform is fixedly mounted on the top of the multi-axis linkage. A central controller is located on one side of the base frame, and a power module is installed inside the central controller. This vibration-damping support platform for multi-axis linkage machining of aerospace parts uses a combination of magnetorheological dampers and shape memory alloy springs. With the intelligent control of the central controller, the viscosity coefficient of the magnetorheological damper can be changed by a current regulator, and the elastic modulus of the shape memory alloy spring can be changed by a temperature control module, specifically suppressing vibrations in different frequency bands and solving the problem of the single vibration isolation method in traditional platforms. Simultaneously, the positioning rod and the connecting frame work together to limit lateral displacement, reducing the impact of vibration transmission.

A method of determining an aperture area of a nozzle hole in a droplet jet device including a flow channel through which a liquid flows and the nozzle hole configured to spray the liquid, the method including determining the aperture area [m2] of the nozzle hole so that a jet flow of the liquid sprayed from the nozzle hole is fragmented into droplets, the liquid having a value of ρ0.45 / σ determined from a density [kg / m3] of the liquid and a surface tension [N / m] of the liquid in a range no lower than 300 and no higher than 900, and a kinematic viscosity coefficient [m2 / s] of the liquid in a range no lower than 1.0E-6 and no higher than 2.0E-5.