6 results about "Compressibility" patented technology

This invention discloses a passive buoyancy compensation method using gas-liquid mixing for profiling buoys, belonging to the field of buoyancy adjustment technology for marine observation buoys. This method constructs a passive buoyancy compensation system containing gas and liquid chambers, and adjusts the gas-liquid volume ratio to achieve linear and continuous adjustment of the system's equivalent compressibility coefficient, dynamically matching the compression characteristics of seawater at different depths. A mathematical model of the overall force on the buoy is established to determine system design parameters. Sensors are deployed to collect buoy depth and axial acceleration data, calculate motion parameters, predict and estimate the depth, and compare it with the target depth. When the deviation threshold is exceeded, an active fine-tuning judgment process is initiated. Active adjustment is disabled during the inertial-dominated phase, and during the non-inertial phase, the controller sends a fine-tuning command to the active buoyancy system to execute reverse buoyancy adjustment. The passive buoyancy compensation method using gas-liquid mixing provided by this invention can achieve low-power buoyancy control with passive adjustment as the primary method and active adjustment as a secondary method, effectively extending the underwater operational life of the buoy.

This invention discloses a method and system for calculating high-frequency noise of underwater vehicles based on fluid compressibility. The method includes: obtaining the local static pressure of the flow field; calculating the density distribution of the compressible water flow based on the local static pressure and the compressibility characteristics of the water; constructing a flow control equation considering fluid compressibility based on the density distribution of the compressible water flow, and solving the velocity distribution, pressure distribution, and density fluctuation distribution of the flow field through numerical iteration; constructing the FW-H equation based on the density distribution, velocity distribution, pressure distribution, and density fluctuation distribution of the compressible water flow; and embedding the flow control equation and the FW-H equation considering fluid compressibility into a computational fluid dynamics solver for solving, thereby obtaining the high-frequency noise calculation results of the underwater vehicle. This invention can effectively control the high-frequency noise rise phenomenon and improve the accuracy of high-frequency noise prediction for underwater vehicles.

The utility model relates to the technical field of engineering blasting, and specifically discloses an engineering blasting water hole blasting charge structure, which comprises a baffle, the baffle is a cylindrical structure with open ends, a supporting plate is fixedly connected to the lower part of the inside of the baffle, a buffer plate is arranged directly above the supporting plate, a plurality of springs that are uniformly distributed in a circular shape are fixedly connected between the supporting plate and the buffer plate, a base is arranged on one side of the baffle, the gas compressibility and the elastic support mechanism are combined, the technical bottleneck of pressure balance and the stability of the propellant column in deep water blasting is broken through, the modular sealing connection design greatly reduces the construction difficulty of complex working conditions, the baffle is infinitely expanded through a standardized threaded interface, the hole depth limit is broken through, the positioning accuracy of the device in the inclined blast hole is significantly improved through self-adaptive counterweight, and the safety and the economy are both improved as a whole.

Device and method for determining a property, in particular a viscosity or compressibility, of a fluid, in particular a functional fluid, of a component (102), in particular a viscosity or compressibility, wherein measurement data characterizing an operating characteristic of the component (102), in particular a power and / or a rotational speed of a pump with which the fluid is pumped, and / or a displacement of a hydraulic cylinder driven by the fluid, are acquired (206), wherein, depending on the acquired measurement data, a characteristic parameter for the function of the component (102), in particular a power signal and / or a force-displacement characteristic curve, is determined (208), wherein the property is determined depending on a result of a comparison between the determined characteristic parameter and a predetermined characteristic parameter for the function of the component (102).in particular a given power signal and / or a given force-displacement characteristic, is determined (210).

The application relates to the technical field of temperature-pressure phase diagram modeling, and discloses a temperature-pressure phase diagram modeling method based on a Grover model, which comprises the following steps: S1: obtaining the thermal expansion coefficient, volume and isothermal bulk modulus thermodynamic data of a rare earth tantalate system under different temperature and pressure conditions; S2: respectively correcting the molar volume and the isothermal compressibility under standard atmospheric pressure, reducing the influence of excessive sensitivity of the heat capacity on the coupling relationship between the temperature and the pressure, so as to realize the correction of the Grover model; and S3: obtaining the Gibbs free energy change through the corrected Grover model state equation, and linearly superimposing the Gibbs free energy change and the Gibbs free energy under standard atmospheric pressure given by a thermodynamic database to obtain a temperature-pressure phase diagram model. The application can ensure the accuracy of the obtained Gibbs free energy, thereby ensuring stable modeling and ensuring the reliability of the phase diagram.

A tight reservoir compressibility evaluation method at logging scale belongs to the technical field of fracturing in downhole operation in the petroleum industry, and comprises the following steps: S1, gamma, density, acoustic data are introduced into the ground stress profile software to obtain the ground stress, Young's modulus and Poisson's ratio parameters, and the horizontal stress difference coefficient, stress quality coefficient and brittleness index factor are respectively calculated according to the formula; S2, the minimum horizontal principal stress is taken as the main control factor of compressibility, and the partial correlation coefficients of the horizontal stress difference coefficient, stress quality coefficient, brittleness index, macroscopic crack factor and the main control factor are measured under the condition of controlling other factors; S3, the compressibility coefficient is obtained by multiplying the values of each influencing factor and the corresponding weight. Through post-pressure test analysis, it is verified that the tight reservoir compressibility evaluation method at logging scale is reliable and simple, and can effectively guide the single well fracturing design.