7 results about "Liquid dynamics" patented technology

The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.

The invention discloses a method, device and equipment for determining a dyne value of a substrate surface and a storage medium, and relates to the technical field of computers. The method comprises the following steps: acquiring a plurality of frames of test images recording the dynamic wetting process of test liquid on the surface of a base material; determining the shrinkage speed of the test liquid on the surface of the base material according to the multiple frames of test images; and determining a target dyne value of the surface of the base material according to the shrinkage speed. According to the technical scheme, the dynamic change of the wetting process is recorded and quantitatively analyzed through multiple frames of images, the corresponding relation between the shrinkage speed and the dyne value based on image calculation is more accurate, the random error of manual visual judgment is remarkably reduced, and the test result has good repeatability and comparability.

The invention discloses a high-precision reconstruction method for a dynamic liquid level of a trace liquid. The method comprises the following steps: synchronously acquiring a binocular image sequence of the dynamic liquid level of the trace liquid to be measured; based on the binocular image sequence, obtaining an initial three-dimensional point cloud of the dynamic liquid level through stereoscopic vision three-dimensional reconstruction; constructing a fluid mechanics constraint model of the micro-liquid based on the action of surface tension and gravity; performing iterative optimization processing on the initial three-dimensional point cloud by taking a fluid mechanics constraint model as a constraint condition to obtain an optimized dynamic liquid level three-dimensional model; based on the optimized dynamic liquid level three-dimensional model, the liquid level height and the volume capacity of the micro liquid are calculated. According to the method, visual three-dimensional reconstruction and fluid mechanics constraints are fused, the liquid level form better conforms to the physical reality through iterative optimization, the measurement precision, response speed and anti-jamming capability of the micro-liquid in the dynamic process are remarkably improved, and the method is suitable for the precise metering requirements of the fields of biomedicine, chemical analysis and the like for micro-upgrading liquid.

The invention provides a dual-path battery health state estimation method based on an electrical coupling model, which comprises the following steps: step 1, establishing an electrical coupling model of a battery, the electrical coupling model comprising a gas-liquid dynamic model and an equivalent circuit model; 2, performing parameter identification on the gas-liquid dynamic model and the equivalent circuit model respectively; 3, constructing a joint estimation state equation based on the key parameters obtained through identification, and carrying out fusion estimation on the battery state; and 4, providing a battery health state estimation method based on the gas-liquid coupling model. According to the method, through dual prediction of the gas-liquid dynamic model and the equivalent circuit model, high-precision parameters of the gas-liquid dynamic model and structural simplicity and convenience of the equivalent circuit are considered, and accuracy and robustness of a prediction result are ensured; meanwhile, the parameter identification of the gas-liquid dynamic model is convenient, the parameter is used as the aging characteristic of the battery, the physical significance of the model is reflected, and errors generated by model prediction iteration can be avoided.

The utility model discloses a hydraulic positioner which comprises a base, and an overturning adjusting module is installed on the base. The overturning adjusting module comprises a first air cylinder installed at the bottom of the base, the movable end of the first air cylinder is connected with a rotation angle adjusting module, and the rotation angle adjusting module is rotationally connected with the two sides of the upper portion of the base respectively. A pneumatic chuck is mounted on the rotation angle adjusting module; according to the utility model, the hydraulic driving system is adopted to adjust the turning displacement of the positioner, so that the stability of the positioner in long-time operation is improved, the operation precision is higher, the hydraulic driving system is suitable for heavy workpieces with higher load, the abrasion of parts of the positioner can be reduced when the positioner bears larger load, and the working efficiency is improved. And the service life of the positioner is prolonged, and the maintenance cost is reduced.

This invention relates to a closed-loop axial hydrostatic / hydrostatic bearing spindle system for an inertial friction welding machine. The invention aims to address the problem that in inertial friction welding machines, the system cannot adaptively adjust the oil film thickness of the hydrostatic / hydrostatic thrust bearing according to the magnitude of the axial upsetting force from start to finish, thus failing to form a fully closed-loop system. The spindle system is equipped with opposing double-sided hydrostatic / hydrostatic thrust bearings. One side is a load-bearing hydrostatic / hydrostatic thrust bearing (11), and the other side is a non-load-bearing hydrostatic / hydrostatic thrust bearing (12). The non-load-bearing hydrostatic / hydrostatic bearing (12) acts as a back pressure, improving the oil film stability and stiffness of the load-bearing hydrostatic / hydrostatic thrust bearing (11), increasing welding accuracy, facilitating control of axial shortening, and improving welding stability and efficiency. The specific structure is shown in Figure 1.

The invention provides a sodium ion battery SOC accurate estimation method based on an improved gas-liquid dynamic model and a battery management system, and the method comprises the following steps: building a gas-liquid dynamic model used for describing the charge-discharge and polarization process of a battery, the gas-liquid dynamic model constructs a gas total solubility equation in the process of dissolving gas in liquid by simultaneously considering gas gap filling solubility and gas hydration solubility; and estimating the state of charge (SOC) of the battery based on the gas-liquid dynamic model and the input and output data of the battery. A traditional gas-liquid dynamic model only simulates the polarization effect of a battery through gas gap filling solubility, voltage rebound characteristics strongly related to the polarization reaction are difficult to completely describe, and large errors exist in the model. Therefore, the gas hydration solubility is introduced during modeling, and the gas-liquid dynamic model is improved, so that the polarization dynamic behavior of the sodium ion battery is represented more accurately, and the SOC estimation precision is improved.