22 results about "Momentum transfer" patented technology

The invention provides a flow field analysis method capable of optimizing an anti-blocking adjusting stop valve structure, and belongs to the technical field of stop valves, and the method comprises the following steps: S1, based on an energy minimum multi-scale model, dividing each phase medium into a dense phase and a dilute phase through calculation of each phase distribution in each region in a valve; s2, correcting an inter-phase momentum transfer resistance relationship of the liquid-solid two-phase quasi-fluid model, and establishing a mass transfer and drag action relationship between a dilute phase and a dense phase to form a first-stage model; s3, performing medium serialization on the physical image of the first-stage model to form a single dilute phase and a single concentrated phase, establishing a mass exchange and drag action relationship between the dilute phase and the concentrated phase, ensuring that the concentrated phase and the dilute phase meet mass conservation, and constructing a second-stage model; according to the method, the defects of homogeneous hypothesis are corrected through the multi-stage model, the influence of particle aggregation on flow can be reflected, liquid-solid two-phase flow simulation is closer to the actual working condition, and the prediction error of the erosion risk area is greatly reduced.

The invention discloses an oil and gas shaft multiphase flow simulator MphaseSim modeling method and a PINN solving method, and relates to the technical field of oil and gas field exploitation, and the method comprises the following steps: pre-calibrating a modeling strategy, including calibrating gas-liquid two-phase flow, and calculating the average flow velocity according to the section occupied by the gas-liquid two-phase flow; mass transfer can occur between the calibrated gas and liquid phases, but the gas and liquid phases are always in a thermodynamic equilibrium state; in calibration steady-state analysis, the mass flow of any section of the shaft is equal, and the liquid holdup is calculated through a drift-assisted equation. According to the method, on the basis of a mass-momentum-energy coupling mathematical model, the SRK state equation and the drift flow model are combined, the phase change characteristics, momentum transfer and energy conversion rules of the gas phase and the liquid phase can be accurately represented, the model sealing performance is good, and the physical significance is clear; and the device can be stably applied to different types of oil and gas well scenes such as gas wells, deep oil wells and electric submersible pump wells, has no obvious numerical value divergence problem in long shaft flow simulation, and can effectively reflect the real production state of the shaft.

The invention discloses a fractured rock mass anchor rod anchoring performance impact tensile test system and test method, and relates to the technical field of mechanical property testing. A high-strength spring energy storage mechanism, a double-drop-hammer impact mechanism and a fixed cross beam of the system are respectively mounted on a guide supporting polished rod, and the double-drop-hammer impact mechanism and an impact plate are fixedly connected or not fixed and are respectively used for an impact test of a momentum transfer method and an impact test of a drop-hammer free falling body method. The technical problem that existing test equipment cannot be compatible with two test methods is solved. The test system can be used for carrying out a tensile impact test on the axial anchoring performance of an anchor rod at a rock mass joint surface, switching and integration of an impact test of a momentum transfer method and an impact test of a drop hammer and free falling body method are realized, a tester can provide larger impact energy at a small height, and the test efficiency is improved. Meanwhile, the synchronism of drop hammer impact can be guaranteed, and the impact test system can be suitable for tensile impact performance tests of anchor rods in concrete filled steel tubes and large-size rock masses.

This application provides an inertial measurement method and system based on atomic interferometry. The method includes: controlling a first atomic beam and a second atomic beam to exit into an interference region, and sequentially interacting with three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. The exit directions of the first and second atomic beams intersect and are symmetrical about the quantization axis. The effective pulse vector directions of the three pulse beams are adjusted so that the adjusted effective pulse vector directions are opposite to those of the original three pulse beams. The first and second atomic beams are then controlled to exit into the interference region, and sequentially interact with the adjusted three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. Based on the four momentum transfer probability signals, the inertial measurement result is determined. Thus, by reversing the effective pulse vector direction, the interference area is reversed, effectively suppressing noise and drift terms unrelated to the effective pulse vector direction.

The invention discloses a reaction coupling type momentum transfer propulsion system and method, and relates to the technical field of aerospace propulsion, and the reaction coupling type momentum transfer propulsion system comprises a double-momentum operation orbit, a synchronous deflection unit and a momentum conversion medium; the propelling method comprises the steps that the double tracks are unfolded, the momentum conversion medium is accurately accelerated through force equal in size and opposite in direction, counter-acting force is offset as much as possible, the double tracks synchronously deflect to the target direction to a preset angle after a certain speed is reached, the momentum conversion medium is decelerated to be relatively static, and the counter-acting force borne by the tracks in the process serves as propelling power; reverse synchronous acceleration and reverse synchronous deflection are adopted, counter-acting force is coupled and counteracted as far as possible to maintain system stability, pure electric energy is adopted for driving, no mass loss exists in the propelling process, and repeated propelling can be achieved, so that the higher acceleration upper limit is achieved. The method is suitable for medium-long distance space electromagnetic propulsion, deep sea equipment propulsion and other scenes.

This invention relates to a wing with enhanced aerodynamic performance for flapping wings based on biomimetic leading-edge feathers, belonging to the field of aircraft design and manufacturing technology. It solves the problems of high maneuverability and difficulty in variable-attitude flight of existing flapping wings, effectively improving the leading-edge flow and enhancing flapping wing flight performance. This invention improves the evolution of the incoming boundary layer by introducing biomimetic leading-edge feathers to the leading edge of a curved wing body to form directional vortex pairs; it enhances the aerodynamic performance of flapping-wing UAVs by suppressing and / or improving boundary layer separation at high angles of attack through vortex-induced downwash and momentum transfer; the biomimetic leading-edge feathers do not change the existing wing aerodynamic shape, and the hardware design is completed by adding small-scale spoiler structures to the leading edge, resulting in a simple overall structure and easy maintenance; and through free control of the feather characteristic shape, number, and angle, it serves the aerodynamic enhancement of flapping-wing UAVs under different flight conditions and performance requirements.

This invention discloses a two-component atomic interferometer for large momentum transfer based on four-wave dual-diffraction Raman spectroscopy. It includes a vacuum system, within which cold atomic clusters comprise two components. First, second, and third Raman lasers incident on the vacuum system constitute the Raman light of the first component, while first, second, and fourth Raman lasers constitute the Raman light of the second component. Frequency variations in the third and fourth Raman lasers compensate for the Doppler frequency shift caused by the difference in recoil velocity during the large momentum transfer of the two atomic components. This invention utilizes the insensitivity of the two-component atomic interferometer to the third frequency of the Raman laser. By independently adjusting the frequency of the non-shared lasers of the two-component atomic interferometer, it achieves large momentum transfer in the two-component atomic interferometer while ensuring common-mode suppression of phase noise in the two-component atoms, and without limiting the number of recoil photons by the Doppler frequency shift difference, thus improving the accuracy of differential measurements.

The application provides a flow field analysis method for optimizing the structure of a plug prevention and adjustment stop valve, and belongs to the technical field of stop valves, and comprises the following steps: step S1: based on an energy minimum multi-scale model, each phase medium is divided into a dense phase and a dilute phase through calculation of phase distribution in each region in the valve; step S2: the interphase momentum transfer resistance relationship of a liquid-solid two-phase pseudo-fluid model is corrected, a mass transfer and drag force action relationship is established between the dilute phase and the dense phase, and a first stage model is formed; step S3: the physical picture of the first stage model is continuously changed in medium, a single dilute phase and a dense phase are formed, a mass exchange and drag force action relationship between the two is established, the dense phase and the dilute phase are ensured to satisfy mass conservation, and a second stage model is constructed; in the application, the defects of the homogeneous phase assumption are corrected through the multi-stage model, the influence of particle aggregation on flow can be reflected, liquid-solid two-phase flow simulation is closer to actual working conditions, and the prediction error of an erosion risk area is greatly reduced.

The invention discloses a design method and system of a COMSOL-based microfluidic detection device, and the method comprises the following steps: determining the structural size of a microfluidic device by taking the flow velocity of liquid in the microfluidic device as a control target; physical parameters of the capillary pump are determined through experimental determination; describing momentum transfer by using a Navier-Stokes equation, and establishing a control equation of fluid motion in combination with a mass conservation continuity equation; based on the structure size of the microfluidic device, the physical parameters of the capillary pump and the control method, constructing a microfluidic model guided by the micropump by using COMSOL, and performing simulation; parameters of the microfluidic model are adjusted according to simulation result feedback, and the design of the microfluidic device is completed. A two-dimensional model is used for approximately simulating a three-dimensional microfluidic structure, an actual experiment and a simulation experiment are combined, a high-value theoretical reference basis is provided for experimental research, and the device is convenient to adjust and optimize in the actual experiment.

The application discloses a COMSOL-based microfluidic detection device design method and system, which comprises the following steps: taking the liquid flow speed in the microfluidic device as a control target, determining the structural size of the microfluidic device; determining the physical parameters of the capillary pump through experimental measurement; using the Navier-Stokes equation to describe momentum transfer, and combining the mass conservation continuity equation to establish the control equation of fluid motion; based on the structural size of the microfluidic device, the physical parameters of the capillary pump and the control method, using COMSOL to construct a micro-pump-guided microfluidic model and to simulate; according to the simulation result, adjusting the parameters of the microfluidic model to complete the design of the microfluidic device. The application uses a two-dimensional model to simulate a three-dimensional microfluidic structure, combines the actual experiment with the simulation experiment, provides a high-value theoretical reference for the experimental research, and is convenient for adjusting and optimizing the device in the actual experiment.

The present invention relates to a method, a computer program with instructions, and a device for controlling a light projection of a means of locomotion. The invention also relates to a means of locomotion that uses a method or a device according to the invention. In a first step, at least one virtual object is projected into an environment of the means of locomotion (10). In addition, a movement of a body part of a living being relative to the projected virtual object is detected (11). Based on the detected movement, a virtual energy or momentum transfer to the projected virtual object is calculated (12). The projection of the virtual object is then adjusted according to the virtual energy or momentum transfer (13).

The present application belongs to the technical field of geological disaster monitoring, and discloses a debris flow velocity inversion method based on an optical flow model, and proposes an integrated optical flow framework for simultaneously inverting the surface velocity field and the front velocity of the debris flow. Through three sets of large-scale flume experiments, the method provides a robust and accurate tool for characterizing complex flow kinematics. By simultaneously measuring the surface velocity field and the front velocity, the main limitations of existing computer vision techniques are overcome, and a more comprehensive understanding of the flow process is achieved. The core scientific contribution lies in the new physical insights obtained through synchronous measurement: the research results provide direct and strong observational evidence, which links the high-frequency velocity pulses at the front to the secondary surge dynamics propagating from the tail. This discovery is crucial for understanding internal momentum transfer and energy dissipation. At the methodological level, the framework is superior to the benchmark deep learning tracker in terms of reproducing flow velocity statistical characteristics and ensuring numerical accuracy.

This invention discloses a method and apparatus for sputtering deposition of optical thin films based on a dual-pulse source, belonging to the field of optical thin film manufacturing technology within optical manufacturing. This invention adjusts the corresponding deposition parameters for different substrates and targets to achieve the deposition and preparation of various optical thin films. The dual-pulse source consists of a main source and an auxiliary source. High-energy charged particles generated by the main pulse source bombard the target surface, undergoing cascade collisions within several atomic layers. Energy exchange occurs between the particles and the target. When the target atoms gain sufficient energy to overcome their atomic barriers, they leave the target surface and deposit on the substrate to form a thin film. High-energy particles generated by the auxiliary pulse source bombard the surface of the growing thin film. Film molecules gain greater kinetic energy through energy and momentum transfer with the high-energy particles, resulting in enhanced film adhesion and a denser surface arrangement. This invention can achieve the preparation of multiple types of optical thin films while also improving the filling density and performance of optical thin films.

The present invention discloses a satellite attitude pointing adjustment method based on multi-body momentum moment transfer, which includes calculating an attitude error value according to a target attitude angle and an initial attitude angle of satellite rotation; calculating an angular acceleration of rotation based on the attitude error value; solving for the angular acceleration of rotation of the satellite body based on the attitude dynamics equation of momentum moment; updating the angular velocity of rotation of the satellite body and the angular velocity of rotation and the rotation angle of the end rod of the robotic arm; determining whether the rotation angle satisfies the joint angle range constraint condition, and if so, proceeding to the next step, otherwise terminating the algorithm; updating the real part and the imaginary part of the quaternion, then calculating three components of the attitude angle of satellite rotation, then calculating the attitude angle of satellite rotation, and then calculating the attitude error value between the attitude angle of satellite rotation and the target attitude angle; and finally determining whether the attitude error value is less than a preset threshold, and if so, performing attitude pointing adjustment according to the three components, otherwise returning to the step of calculating the angular acceleration of rotation.

The present invention relates to the field of spacecraft safety technology, and in particular to a method and system for controlling the attitude recovery of a probe under a micrometeoroid impact, comprising: detecting whether a system-level failure occurs after a micrometeoroid impacts a space gravitational wave detector; if not, monitoring the detector state parameters to perform state estimation and obtain estimated values of the detector attitude angular velocity and the relative velocity of a proof mass; performing recovery control based on the detector posture and the proof mass posture when an intersatellite laser link exists; and performing recovery control based on the estimated values of the detector attitude angular velocity and the estimated values of the proof mass relative velocity when an intersatellite laser link does not exist, thereby re-establishing the laser link. When a micrometeoroid impacts a probe, the present invention converts the momentum transferred to the probe by the micrometeoroid impact into monitorable probe state parameters, and implements different recovery control strategies based on the probe state parameters, thereby rapidly achieving recovery of the probe attitude pointing direction.

A pressure sensor and method for sensing pressures in the sub-atmospheric pressure region are discussed. The pressure sensor comprises :a substrate having a surface in contact with a gas whose pressure is to be measured. A driving means for generating a surface acoustic wave in the surface of the substrate. A detecting means for detecting a change in at least one property of the surface acoustic wave caused by a damping effect due to momentum transfer or drag force from gas molecules interacting with the sensing surface, the detecting means being configured to determine a pressure of the gas from the detected at least one property change.

The present invention relates to a method, a computer program with instructions, and a device for controlling a light projection of a means of locomotion. The invention also relates to a means of locomotion that uses a method or a device according to the invention. In a first step, at least one virtual object is projected into an environment of the means of locomotion (10). In addition, a movement of a body part of a living being relative to the projected virtual object is detected (11). Based on the detected movement, a virtual energy or momentum transfer to the projected virtual object is calculated (12). The projection of the virtual object is then adjusted according to the virtual energy or momentum transfer (13).

The invention provides a cold atom gravimeter sequential control method and device for controlling speed distribution evolution, and the method comprises the steps: introducing a radio frequency drive light pulse which is matched with the instantaneous centroid speed and thermal speed distribution in an atom falling process; the atoms with different instantaneous centroid velocities and different thermal velocity distributions are sequentially acted by the radio frequency driving light pulses matched with the atoms, so that the thermal velocity distribution width of the atoms is rapidly reduced, the proportion of the atoms participating in the effective interference or momentum transfer process is effectively improved, the atomic signal contrast and interference fringe visibility are enhanced, and the measurement accuracy is improved. The method has a direct effect on gravity measurement sensitivity and statistical noise reduction.

The application provides an X-ray momentum transmission type mass and foreign matter detection method and system, and relates to the field of nondestructive testing. A photon event stream vector transmitted through a measured object is acquired; a frequency band cutting is performed on the photon event stream vector based on a preset energy comparison logic, a first feature matrix representing a low-frequency band energy distribution and a second feature matrix representing a high-frequency band energy distribution are acquired; a spatial integral calculation is performed on the second feature matrix by using a high-energy idle baseline, an absolute scalar mass prediction value is acquired; a spatial gradient absolute value of the first feature matrix is extracted, and a foreign matter mask image is generated in combination with a foreign matter determination threshold. The technical problem that the quality characteristics and material composition attributes are coupled to cause detection failure is solved.

The invention discloses a large momentum transfer two-component atom interferometer based on four-wave double-diffraction Raman, which comprises a vacuum system, a cold atomic group arranged in the vacuum system comprises atomic groups of two components, a first Raman laser, a second Raman laser and a third Raman laser which are incident to the vacuum system form Raman light of a first component, and a second Raman laser and a third Raman laser which are incident to the vacuum system form Raman light of a second component. The first Raman laser, the second Raman laser and the fourth Raman laser form Raman light of a second component; and the frequency of the third Raman laser and the frequency of the fourth Raman laser are changed to compensate Doppler frequency shift caused by the recoil speed difference in the atomic large momentum transfer process of the two components. The characteristic that the two-component atom interferometer is insensitive to the third frequency of Raman laser is utilized, and the frequency of non-shared laser of the two-component atom interferometer is independently adjusted, so that large momentum transfer of the two-component atom interferometer of which the number of recoil photons is not limited by Doppler frequency shift difference is realized while common-mode suppression of two-component atom phase noise is guaranteed, and the large momentum transfer of the two-component atom interferometer is realized. And the differential measurement precision is improved.

The invention relates to the technical field of photoelectric demonstration devices, in particular to a momentum transfer photoelectric demonstration device and demonstration method. A plurality of swing mechanisms are linearly arranged in a showcase in the photoelectric demonstration device, the swing end of each swing mechanism is provided with a swing rod, the lower swing end of each swing rod is provided with a bulb, and the bulbs are in contact with one another in sequence when being static so as to form a momentum transfer demonstration swing mechanism; the swing mechanisms located on the two sides can swing to the set height and fall down reversely when the bulbs on the swing mechanisms are impacted, and the bulbs can sequentially flash when being impacted under the control of the control system so as to display the momentum transmission state. And a visual effect of infinite peeping or snakelike pendulum is formed in combination with a closed space created by the deformable plane mirror and the semi-reflecting and semi-transmitting mirror. Through cooperation of the linearly arranged swing mechanism, the contact type bulb, the deformable plane mirror and the control system, the momentum transfer state can be visually displayed, and the demonstration clarity and observability are improved.

The application discloses a double-layer flooding area compound river channel flow velocity distribution model and turbulent flow characteristic analysis method based on Tsallis entropy, and is applied to the technical field of river channel hydrodynamic characteristic research. Firstly, a symmetric compound river channel physical model with a deep main channel and a double-layer flooding area structure is built, multiple test working conditions are set, and three-dimensional instantaneous flow velocity data are collected; after data preprocessing, the average flow velocity distribution law is analyzed, the double-turning causes of the main channel flow velocity and the turbulent flow evolution characteristics of the flooding area are determined; based on the Tsallis entropy theory, combined with the turbulent flow structure and the momentum transfer law, a modified flow velocity distribution model is constructed by introducing a Gaussian correction term, and key model parameters are determined; the flow velocity is calculated, and the model precision is verified. The application solves the technical problems that the traditional model cannot represent the double-turning characteristics of the double-layer flooding area compound river channel, has poor adaptability and low prediction precision, and has clear physical meaning of model parameters and high prediction precision.