12 results about "Compressibility" patented technology

A method can include determining carbon dioxide acoustic properties for at least supercritical carbon dioxide using thermodynamics that relate isothermal compressibility and adiabatic compressibility: determining fluid-saturated rock acoustic properties using the carbon dioxide acoustic properties; and performing a seismic workflow using the fluid-saturated rock acoustic properties.

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.

The invention relates to the technical field of thin interbed compressibility evaluation, in particular to a comprehensive compressibility evaluation method for a thin interbed tight reservoir, which comprises the following steps: acquiring original geological parameters and original engineering parameters of a target thin interbed reservoir, and sequentially executing two different types of preset micro-dynamic excitation operations on the target thin interbed reservoir, synchronously acquiring a multi-dimensional response signal generated by the stratum under each excitation operation; for each type of excitation operation, based on the corresponding multi-dimensional response signal, determining a conduction mode sequence of the event signal under the type of excitation in the longitudinal direction; conducting mode sequences determined by all types of excitation operations are fused and analyzed, and a dynamic coupling strength index and a stress interference mode between thin interlayers are determined; by analyzing conduction behaviors of the dynamic response signals, real controlled factors of stress wave propagation and fluid pressure transmission in the fracturing process can be directly reflected, and the pertinence and accuracy of evaluation are improved.

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 invention discloses a cross-medium aircraft high-speed water outlet flexible load reduction rectifying device, and relates to the technical field of cross-medium aircraft structure protection. The device conformally wraps the head of the aircraft and sequentially comprises an inner side bonding layer, an anti-static pressure air bag layer, an energy absorption foam layer and an outer side protection layer from inside to outside, underwater collapse is prevented through the internal pressure of preset gas of the anti-static pressure air bag layer, and low-frequency large-displacement buffering is provided through the compressibility of the gas at the water outlet moment; high-frequency impact is absorbed through deformation of the energy-absorbing foam layer, and transition from a blunt-end inner shape to a pointed-end outer shape is achieved. And supercavitation is formed through the streamline shape, so that the water outlet resistance is reduced. Through the material, shape and thickness design of each layer, water outlet resistance reduction and pressure resistance keeping in a deep water environment and efficient buffering at the water outlet moment are achieved, the underwater launching success rate is effectively increased, and precise instruments at the head of an aircraft are protected.

The invention belongs to the technical field of metal component detection, and discloses a high-strength anti-seismic bracket performance testing device, which comprises a hydraulic tension testing machine, and an upper driver and a lower driving system which are arranged on the hydraulic tension testing machine. Through cooperation of structures such as the buffer mechanism, fracture stress pushes the first oil tank and the fixing device to ascend and suddenly extrude hydraulic oil into the second oil tank, the fixing device enters the first oil tank, the stress acts on the hydraulic oil in the fixing device, and the flow characteristic of the hydraulic oil can effectively weaken generation of instantaneous stress; the compressibility and the fluidity can disperse the propagation velocity of pressure waves and prolong the stress release time, through flow limitation of the steel pipe and downward thrust of the spring telescopic rod, the flow velocity is reduced, the effect of weakening impact force is enhanced, the stress borne by the spring telescopic rod is weakened by the damper, the stress generated by component breakage is further absorbed, and the service life of the spring telescopic rod is prolonged. And the damage probability of internal electronic elements and structures of the hydraulic tension testing machine is greatly reduced.

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.

The invention relates to the technical field of aerospace vehicle aerodynamics ground tests, in particular to a wing body assembly large attack angle asymmetric separation flow experiment method and system. The method comprises the following steps: presetting train number parameters of a wind tunnel test model, a multi-color continuous oil supply module, a pressure image acquisition module, a flow display module, a pressure measurement module and a wind tunnel; image data and pressure data are synchronously acquired, the image data are pixel-level resolution time sequence oil flow image data formed on the basis of the surface of the wind tunnel test model, and the pressure data are acquired high-precision pressure distribution data on the surface of the wind tunnel test model; based on the acquired image data and the pressure data, acquiring an asymmetry degree, a bistable depth, a fitting coefficient and a compressibility suppression ratio; if the bistable depth is gt; 0.05 and the fitting coefficient is gt; when 0.9 is reached, judging that the state is an obvious bistable state; and otherwise, determining the state as weak bistable state / no bistable state.

The invention provides a gas reservoir flowing substance equilibrium reserve calculation method, and relates to the technical field of gas reservoir reserve calculation. The method comprises the steps that basic parameters of a constant-volume gas drive gas reservoir and dynamic data of well bottom flowing pressure actually measured in the stable production stage of a gas well are sorted and smoothed; secondly, initial flowing bottomhole pressure and a pressure square difference initial value are determined, and it is assumed that the pressure square difference is constant; then, the average formation pressure, the gas deviation coefficient and the gas isothermal compression coefficient in the gas well stable production process are circularly calculated; then constructing a gas reservoir flowing substance balance equation considering the non-Darcy effect, and calculating dynamic data of variables X and Y; adjusting a pressure square difference value through iteration, and performing linear fitting on the X and Y scatter points until the longitudinal axis intercept of a linear function approaches zero, so as to determine a straight slope; and finally calculating the single well control reserves according to the slope and the basic parameters. According to the method, the limitation of Darcy seepage hypothesis is overcome, and accurate reserve evaluation based on whole-process data is realized.