12 results about "Pressure wave propagation" patented technology

The invention discloses a heat exchange station leak detection positioning system based on a pressure fluctuation rule, and particularly relates to the field of monitoring positioning, and the system comprises a dynamic site selection module which is used for determining the position of a detection point through multi-pipeline parameter cooperative matching; the working condition self-adaptive module is used for dynamically adjusting a sampling strategy according to the operation load of the heat exchange station; the leakage screening module is used for establishing a leakage judgment threshold value in combination with historical data and real-time working conditions; the propagation velocity correction module is used for analyzing the propagation velocity of the pressure waves by integrating medium and pipeline characteristics; the double-constraint positioning module is used for realizing leakage point positioning by combining time difference and characteristic value double constraints; the closed-loop verification and correction module is used for verifying a positioning result through theoretical verification and actual measurement to realize digital and intelligent management; through the three-dimensional coupling feature extraction and multi-working-condition threshold value dynamic correction method, the limitation of single parameter judgment is avoided, the leakage judgment accuracy is improved, and a scientific basis is provided for operation and maintenance decision making.

The invention discloses a water hammer eliminating device and method based on cloud network intelligent interconnection, and belongs to the technical field of fluid conveying system safety protection. Aiming at the problems of response lag, node isolation, lack of predictive ability and poor fault tolerance of a traditional water hammer elimination device, the invention provides an intelligent protection scheme fusing cloud edge collaboration and physical data hybrid modeling. The device comprises a distributed data acquisition module, a water hammer elimination execution module, an intelligent control module and a cloud platform, real-time fluid parameters are collected, pipe network topological information is combined, the action time sequence is calculated based on the pressure wave propagation speed and the node distance, and pre-action is started before pressure waves arrive; a physical simulation model and an LSTM data driving model are fused to predict the water hammer risk, the safety redundancy time and the execution strategy are dynamically adjusted, and local autonomy and fault tolerance under communication interruption are supported. Millisecond-level pre-action and multi-node cooperative pressure relief are achieved, the water hammer peak pressure is remarkably reduced, and the safety and the intelligent operation and maintenance level of a complex pipe network are improved.

This application relates to the field of pump station regulation technology, providing a hydraulic optimization control method and system for flow balance among cascade pump stations. The method includes: constructing a water distribution correlation topology through water balance analysis; loading real-time interval water distribution demand to locate the M water distribution flows of M pump stations; simulating the pressure wave propagation process of water distribution demand changes and outputting transient terminal flow rates; calculating initial PID weight allocation based on the deviation between the target flow rate of the pump station and the water distribution flow rate; compensating the initial PID weights based on the deviation between the target terminal flow rate and the transient terminal flow rate, and executing independent PID control and pressure surge regulation coordinated control. This application solves the technical problem that in the process of flow scheduling among cascade pump stations, due to changes in water source and fluctuations in pump station flow demand, it is impossible to accurately regulate the flow balance among pump stations, leading to water resource waste and low efficiency of cascade pump stations. It achieves the technical effect of improving the stability and flow regulation efficiency of cascade pump stations and ensuring optimal allocation of water resources.

The invention discloses a digital twinning and hanging load coupled well leakage monitoring system and method. According to the system, a full-shaft multi-physics-field coupled digital twinborn model is constructed, a fluid density correction model changing along with pressure and temperature and an unsteady fluid mechanics calculation method are combined, and the theoretical pumping pressure and the theoretical hook hanging load are obtained; based on the deviation between the actually-measured pump pressure and the theoretical pump pressure and the deviation between the actually-measured hook hanging load and the theoretical hook hanging load, a pump pressure-hanging load cooperative judgment mechanism is established, and well leakage state recognition is achieved; determining a well leakage position through a virtual monitoring node arranged along a shaft in combination with pressure wave propagation characteristics; meanwhile, self-adaptive switching of monitoring modes is achieved according to the state of the underground pressure measuring instrument. The accuracy and real-time performance of well leakage identification can be improved, and the influence of temperature and pressure disturbance on the identification result is reduced.

The invention discloses a lithium ion battery thermal runaway safety evaluation method and system, and the method comprises the steps: constructing a coupling test environment of a battery pack, collecting environment adaptation parameters of the battery pack in a preset period, and positioning a thermal runaway trigger point according to the environment adaptation parameters; acquiring an initial energy source parameter of the thermal runaway trigger point, and calculating a sympathetic detonation critical distance based on the initial energy source parameter; positioning an out-of-control spreading point according to environmental adaptation parameters acquired periodically, acquiring a thermal out-of-control time difference between the thermal out-of-control trigger point and the out-of-control spreading point, and calculating a thermal out-of-control spreading speed by combining a coupling test environment; and comparing the sympathetic detonation critical distance with the distance between the adjacent batteries, and judging whether thermal runaway propagation enters a risk propagation stage or not based on a comparison result. Compared with a traditional safety evaluation test, the method has the advantages that the coupling effect of heat accumulation and mechanical shock in an actual scene is reproduced, and quantitative research on sympathetic detonation of adjacent batteries caused by pressure wave propagation is carried out by comparing a sympathetic detonation critical distance with a fixed distance.

The invention discloses a dynamic pressure balance regulation and control method and system for a water conveying pipeline, and relates to the technical field of fluid conveying control, and the method comprises the following steps: collecting synchronous pressure data of a plurality of monitoring points arranged along the water conveying pipeline, endowing a unified time scale, constructing a pressure change sequence sorted according to time, and a pressure sudden change time point is marked in the pressure change sequence. By constructing a pressure change sequence and a propagation delay record with a unified time scale, the method achieves the recognition of a pressure wave propagation direction and an echo time point, and prevents a reflection echo from being misjudged and repeatedly triggered and adjusted. Meanwhile, by generating an adjustment time window and implementing reverse fine adjustment and asymmetric rollback control, the adjustment action and echo superposition process is interrupted, pressure oscillation is restrained, and the operation stability and safety of the water conveying pipeline are improved.

This invention provides a method for calculating the bulk modulus of elasticity of an ultra-high pressure common rail system. The method includes: constructing an ultra-high pressure common rail system test system; selecting measuring points X and Y; recording the pressure signal curves of measuring points X and Y during injection under fixed camshaft speed, injector pulse width, and high-pressure fuel line length; calculating the ultra-high pressure wave propagation velocity u = L / t under each operating condition; calculating the pressure wave propagation velocity at different fuel pressures and temperatures; calculating the fuel density corresponding to the pressure wave propagation velocity under the corresponding pressure and temperature conditions; obtaining the formula for calculating the bulk modulus of elasticity of the ultra-high pressure common rail system under different fuel pressure and temperature conditions; and verifying the calculation results. The method for calculating the bulk modulus of elasticity of an ultra-high pressure common rail system described in this invention can accurately calculate the bulk modulus of elasticity of the system under different fuel pressure and temperature conditions.

The invention discloses a municipal pipeline internal blockage three-dimensional positioning and quantitative evaluation method based on cooperation of pulse pressure waves and ultrasonic guided waves. Comprising the following steps: S1, acquiring basic parameters of a target pipeline and initializing a propagation model; s2, performing pressure wave excitation and multi-point signal acquisition; s3, establishing an in-pipe pressure wave propagation model and introducing blockage equivalent impedance; s4, performing pulse pressure wave-based blockage axial position inversion and blockage degree preliminary quantification; s5, performing ultrasonic guided wave excitation and annular signal acquisition; s6, enabling the blockages attached to the inner wall of the pipe to be equivalent to a local contact stiffness-additional mass-damping system, constructing a circumferential abnormal index, and calculating the circumferential position angle of the blockage, so as to achieve the circumferential accurate positioning of the blockage based on the torsional wave characteristics without reflecting echoes; s7, fusing the pressure wave information and the guided wave information, and performing blockage position three-dimensional schematic reconstruction; and S8, carrying out joint inversion and correction on the blockage degree.

This invention provides a modular construction device and method for a pressure drainage system, relating to the field of drainage system construction technology. The method includes: determining a set of modules to be installed in the pressure drainage system using a module determination component; establishing an initial pressure field model of the construction area and calculating the pressure gradient field of the construction area using a pressure gradient field calculation component; performing module docking priority analysis on the set of modules to be installed using a docking priority analysis component; identifying pressure wave propagation prediction data for each module interface using a pressure wave propagation analysis component; and acquiring pneumatic execution parameters and buffer control parameters for controlling the operation of pneumatic actuators and elastic buffers using a control parameter acquisition component. This invention solves the technical problems of difficult construction, low efficiency, and difficulty in guaranteeing docking accuracy in existing pressure drainage systems. It achieves optimal docking sequence and parameter optimization in the construction of the pressure drainage system, ensuring safe, efficient, and accurate construction.

The application discloses a real-time monitoring method for backfill compactness of a ground source heat pump buried pipe, and relates to the technical field of construction quality control of a ground source heat pump system. P in ( t )、measuring point pore pressure time series data P i ( t )、slurry density p and grouting hole spatial coordinates, extracting pressure wave propagation time to calculate wave velocity, constructing a physical model describing the corresponding relationship between wave velocity v p and compactness D , inverting the compactness of the measuring point, generating a three-dimensional compactness distribution field through spatial interpolation to identify a defect area, converting the defect coordinates into global coordinates to calculate the grouting amount and grouting pressure, and realizing directional grouting. The application is mainly used for real-time monitoring of compactness, accurate identification of defects and targeted reinforcement in the backfill construction of a ground source heat pump buried pipe, thereby guaranteeing the construction quality.

This invention discloses a multi-scale analysis method and system for pressure fluctuations in a rotating flow field using phase-driven fusion. First, unsteady pressure data of the rotating flow field is acquired and a spatiotemporal snapshot matrix is ​​constructed. Then, the dominant frequency and low-order coherent modes of the pressure fluctuations are extracted through dynamic mode decomposition. Subsequently, a global phase field of the entire flow field is constructed based on the temporal information of the modes. Finally, spatial phase gradient analysis is performed on the phase field to determine the propagation direction of the pressure wave. The global multi-scale phase field is traversed to identify characteristic points of phase changes, and the characteristic points of all dominant frequencies are spatially superimposed. Finally, the spatial modes of each characteristic frequency, the global multi-scale phase field, the propagation direction of the pressure wave, and the location of the core excitation source are superimposed and fused. The modes and phase fields at different times are combined according to a time sequence to synthesize a spatiotemporal evolution holographic map of pressure fluctuations in the rotating flow field. This invention achieves precise localization of the pressure fluctuation excitation source and frequency-space-time correlation analysis of pressure fluctuations in the rotating flow field.

This invention relates to the field of mine backfilling and discloses a method, apparatus, equipment, and medium for predicting water hammer in backfill slurry pipelines. The method includes: constructing a non-Newtonian slurry water hammer propagation model for the backfill slurry pipeline; based on the non-Newtonian slurry water hammer propagation model, obtaining key water hammer parameters, including maximum water hammer pressure and pressure wave propagation distance, through a fluid dynamics simulation process; acquiring observed pressure monitoring data and historical pressure monitoring data through pressure sensors; constructing water hammer occurrence criteria, including primary criteria and statistical criteria, based on the maximum water hammer pressure, pressure wave propagation distance, and historical pressure monitoring data; and analyzing the maximum water hammer pressure, pressure wave propagation distance, and observed pressure monitoring data based on the primary criteria and statistical criteria to predict whether water hammer will occur in the backfill slurry pipeline. This application has positive effects such as high computational efficiency, clear criteria, and strong adaptability, and can provide strong protection for the safe and stable operation of mine backfill pipeline transportation processes.