121 results about "Simulated rainfall" patented technology

The invention provides a rainfall and earthquake coupled slope simulation method and system. The method comprises the following steps: constructing a coupling numerical model through multi-physics field data of a slope; the dynamic coupling effect of rainfall and earthquake is simulated by initializing a seepage field and loading earthquake power; the stability of the simulation result is comprehensively evaluated through iteration of a strength reduction method, and whole-process coupling from seepage to dynamic response of the slope is achieved. SeismoSignal is used for processing seismic waves, and the problem that the value of kinematics parameters is not zero when the seismic action is finished is avoided; the allowable maximum negative pore water pressure boundary is assigned to the slope surface of the side slope, the actual steady-state seepage field of the side slope is restored, and the seepage field in the side slope under different rainfall conditions is accurately calculated; by adopting an unsaturated soil dynamic seepage model for a seepage field, Rayleigh damping is introduced and an earthquake load is applied, so that cross-time scale coupling is realized. The method is simple and convenient to operate, high in calculation efficiency and accurate in calculation result, and has practical significance and value in research of the problem in the rock-soil field.

The invention discloses a deep learning-based less-data small-watershed water level forecasting method. The method comprises the following steps of: acquiring historical hourly rainfall data of a plurality of upstream rainfall stations of a small watershed and historical hourly water level data of a downstream water level station; preprocessing the acquired data, and screening rainfall sessions with the rainfall capacity of over 15mm per hour within 24 hours and corresponding water level data; the method comprises the following steps: performing data enhancement through a double-generation GAN model, generating simulated rainfall data by a first GAN model by taking white noise as input, generating simulated water level data by a second GAN model by taking rainfall data as input, combining historical data and simulated data, performing normalization, and dividing the data into a training set, a verification set and a test set according to a proportion; constructing a CNN-LSTM hybrid prediction model, training the model by taking a Nash coefficient as an optimization target, and verifying the prediction model by adopting a progressive verification strategy; and deploying the model for real-time water level prediction to obtain a water level prediction result. The method can break through the bottleneck of few data, and achieves the high-precision mountain torrent early warning of the small watershed water level.

The invention belongs to the related technical field of waterlogging simulation, and particularly relates to an urban waterlogging simulation device and method based on a digital twin system, and the device comprises the digital twin system, a physical sand table, a sensor, and a microcontroller. The twin system is connected with the physical sand table through a microcontroller and sensors arranged on the physical sand table, and is used for simulating the underground pipe network and surface ponding conditions of the urban target area under the rainfall condition, and regulating and controlling the physical sand table through the microcontroller to realize dynamic verification of the urban inland inundation process; the sensor is used for collecting underground pipe network and surface water accumulation condition data in the physical sand table in real time and transmitting the data back to the twin system, bidirectional interaction and synchronous display of the virtual environment and the physical sand table are achieved, and dynamic simulation and verification of the urban inland inundation process are achieved on the whole. Wherein the twinborn model is composed of a pipe network model, a road model and a building model. According to the invention, real-time mapping and interaction of the physical experiment and the virtual model of the urban drainage system can be realized.

Three-dimensional target detection in complex weather is a key problem in intelligent driving, and extreme weather is easy to interfere with a sensor, so that the detection precision is reduced. The invention provides a three-dimensional target detection method in complex weather based on millimeter wave radar and vision fusion, and designs an image generation module for simulating complex environment images such as rainfall, snowfall and the like aiming at the problem of scarcity of bad weather image data in a public data set. And by adopting a self-distillation mechanism, multi-modal knowledge learned by the teacher model in normal weather is migrated to the student model trained in bad weather, so that the detection performance in a complex environment is improved. Besides, in order to enhance the multi-modal information fusion capability, gating fusion modules are introduced into the teacher model and the student model, and a learnable gating fusion mechanism is utilized to dynamically adjust weight distribution of multi-modal feature fusion. According to the method, the robustness and the detection precision of the model under the complex weather condition are effectively improved.

The invention relates to the technical field of permeable material testing, solves the problem that a more complete material selection basis cannot be provided for engineering design in the prior art, and provides a method, a device and equipment for testing the heat dissipation performance of an evaporative cooling material and a storage medium. Acquiring a first mass change value of the to-be-tested sample in the simulated rainfall process; when the instantaneous moisture content meets a preset condition, rainfall simulation is stopped, and a second mass change value of the to-be-tested sample in a preset duration is obtained; placing the to-be-tested sample in the wind tunnel test platform, and obtaining a third mass change value and a surface temperature change value of the to-be-tested sample and an environment temperature change value, a humidity change value and a wind speed change value of the wind tunnel test platform; and obtaining a heat dissipation performance evaluation result of the to-be-tested sample based on the parameters. According to the method, quantitative, comparable and repeatable evaluation of the cooling capacity of the permeable material is realized, and a scientific basis is provided for material performance judgment and application scene selection.

The system comprises a water storage container and a control system, a partition plate and a moving plate connected with a driving mechanism are arranged in the water storage container, a sensor system of the control system is used for monitoring state parameters of the moving plate and the water supply flow of the water storage container, and after the target rainfall intensity is determined, the target rainfall intensity is determined; the controller is used for obtaining state estimation of the moving plate based on the state space model and the state parameters of the moving plate, calculating real-time rainfall intensity by combining the water supply flow of the water storage container, and dynamically controlling the driving mechanism to operate in a closed-loop mode with the target of reducing the error between the target rainfall intensity and the real-time rainfall intensity. The movable plate is driven to move relative to the partition plate to adjust the water outlet area, rainfall holes of the water storage container discharge water to simulate rainfall for an irrigation test, dynamic response continuous adjustment of simulated rainfall intensity can be achieved, natural rainfall scenes of different rainfall intensities and modes can be reproduced in a high-precision mode, a reliable test platform is provided for agricultural irrigation research, design is flexible, and the test efficiency is high. The operability is high.

The utility model relates to the technical field of rainfall simulation, in particular to an artificial rainfall simulation device which comprises a water supply system, a control system, an intelligent terminal system and an acquisition system. The water supply system comprises a water tank, a water pump, a water inlet pipe and a rainfall sprayer. The water pump is arranged on the water inlet pipe and used for pumping water in the water tank to the rainfall sprayer. A control valve is arranged on the rainfall spray head; the intelligent terminal system is used for man-machine interaction, communication with the control system is realized by connecting a local area network built by the system, and data of the intelligent terminal system can be timely transmitted to the control system; the acquisition system comprises a rain gauge and a pressure sensor. The pressure sensor is arranged on the water inlet pipe and used for collecting the pressure value of the water inlet pipe. And the rain gauge is arranged below the rainfall spray head and is used for collecting rainfall. The device has the effect of facilitating rainfall research by simulating artificial rainfall.

The invention discloses a slope soil erosion prediction method, system, equipment and medium, and relates to the technical field of soil erosion, and the method comprises the following steps: taking slope soil with different grain composition as a research object, and carrying out a rainfall simulation experiment; constructing a production and construction project soil erosion prediction model according to the product of a subrainfall erosivity factor, a soil erodibility factor, a slope length factor, a slope factor and a slope surface area on the basis of the grain composition characteristic particle size; and predicting the soil erosion of the slope surface of the to-be-predicted production and construction project through the production and construction project soil erosion prediction model. According to the model disclosed by the invention, a direct quantitative relationship between the characteristic particle size and the erosion strength is established, so that an acquisition way of the soil erodibility factor is simplified, the dependence of the model on complex and expensive soil physical and chemical parameter analysis is greatly reduced, and the operability and the popularization efficiency of the model in a production field are greatly enhanced.

The invention relates to the technical field of soil erosion and cadmium migration simulation experiments, in particular to a karst slope cropland soil erosion and cadmium migration simulation experiment device and method.The karst slope cropland soil erosion and cadmium migration simulation experiment method comprises the steps that a preset soil sample is placed on a soil erosion simulation platform, and environmental factors are adjusted according to experiment requirements; comprising terrain gradient, earth surface rock exposure rate, underground porosity and geological structure; starting a rainfall simulation system, performing rainfall simulation according to preset rainfall intensity, duration and mode, starting a data acquisition system at the same time, and monitoring and recording rainfall parameters in real time; in the rainfall process, soil erosion phenomena including earth surface / underground sediment yield, runoff yield and erosion rate are observed and recorded, and sediment samples are collected through a sediment collector; and performing cadmium concentration determination on the collected sediment sample and runoff sample by using a cadmium concentration analysis instrument, and recording data. And a coupling mechanism between the erosion process and cadmium migration can be more comprehensively understood.

The invention relates to the technical field of urban area configuration, and particularly discloses a service area low-impact measure optimization method and equipment based on an SWMM model. According to the method, the rainfall flood management model of the target service area is constructed through the storm flood management model (SWMM), runoff response under the rainfall condition can be accurately simulated in combination with sub catchment area division and low-impact measure optimization, and compared with a traditional static design method, the low-impact measure design efficiency is remarkably improved, and the method has the advantages of being high in practicability and the like. Therefore, the waterlogging problem caused by the rainstorm in the urban service area is effectively relieved; according to the method, the efficiency coefficient is introduced as a quantitative index, iterative optimization is carried out through comparison with the preset threshold value, and it is ensured that the layout parameters of the low-influence measures can dynamically adapt to terrain, soil and rainfall characteristics of different service areas.

The invention belongs to the technical field of water hammer effect suppression in regional rainfall simulation, and particularly relates to a water hammer effect suppression, regulation and control method for a regional rainfall simulation system. By monitoring the pressure change in the pipeline in real time and dynamically adjusting the valve opening degree of the adjusting valve according to the pressure data of the adjusting valve and the spray head, effective suppression of the water hammer effect in the rainfall simulation process is achieved, the stability of the rainfall simulation experiment is improved, the accuracy of the experiment result is ensured, and in addition, the experiment efficiency is improved. According to the scheme, pipeline water flow characteristics and real-time pressure changes are fully considered, so that prediction, regulation and control of the water hammer effect are more accurate, the requirement of high-precision simulation is met, in a rainfall simulation experiment, equipment damage and data deviation caused by the water hammer effect are effectively avoided, and in addition, the experiment efficiency is improved. And the potential water hammer effect risk in the real-time rainfall process can be early warned, and timely intervention is performed by adjusting the opening degree of the valve, so that the stability of the rainfall simulation experiment is further improved.

The invention relates to the technical field of rainfall simulation, and discloses a portable field artificial rainfall simulation device which comprises a connecting rod, and the outer wall of the connecting rod is fixedly connected with a fixing block used for supporting other structures; the second limiting mechanism is mounted on the connecting rod and used for limiting a connected structure; the spraying mechanism is mounted on the second limiting mechanism and is used for simulating rainfall; the first limiting mechanisms are mounted at the two ends of the connecting rod and used for limiting the connecting rod; the lifting mechanism is mounted on the lower surface of the first limiting mechanism and used for adjusting the rainfall height; the lifting mechanism comprises a first connecting pipe. The rotating sleeve is rotated to drive the threaded rod to move, the first sliding block slides in the first connecting pipe, movement of the threaded rod is limited, the first connecting block is driven to move through movement of the threaded rod, the second connecting block is driven to move through movement of the threaded rod, and then the effect that the height is adjusted to be used in different terrains is achieved.

The utility model belongs to the field of field experiment systems, and discloses a rain reduction experiment device for a high and cold peat land, which comprises a rain interception assembly, a support assembly and a water cut-off assembly, the rain intercepting assembly is used for guiding rainwater to the outside of the sample plot; the supporting assembly is used for supporting the rain intercepting assembly above the ground of the high and cold peat land; the water cut-off assembly comprises a waterproof piece which is used for surrounding the outer side of the supporting assembly and extends into the position below the ground of the high and cold peat land. The device disclosed by the utility model can well realize simulated rain reduction of the high and cold peat land, accurately obtain an experimental structure and avoid interference to the natural state of an ecological system.

The invention provides a test model of a soil slope rain wash protection device and a design method, and belongs to the technical field of engineering simulation tests. The test model comprises a test soil slope; each protection test group comprises at least one protection unit, the protection units of different protection test groups are different in at least one of size, number and spacing, each protection unit comprises a protection structure, the protection structure comprises a gabion mesh cage and broken stones located in the gabion mesh cage, and the broken stones are arranged in the gabion mesh cage. The two opposite sides of the protection unit in the width direction are a back plane and a step surface respectively; the pressure sensor group is arranged at the target position of each protection unit; the deformation sensors are arranged on the step surfaces of the protection units; the dust and sand box is arranged on the ground in front of the slope surface of the test soil slope and is used for collecting the amount of muddy water falling from the test soil slope; and the rainfall model is used for simulating a rainfall scene. The slope protection structure meeting the stress requirement can be designed according to a specific soil slope.

The invention discloses a mudslide simulation test device for a waste slag field in a rainy environment in the technical field of mudslide simulation tests, which comprises a water tank part and a simulation part, and is characterized in that the water tank part comprises a base, a plurality of groups of adjusting rods and a soft tank; the bottom of the adjusting rod is fixedly connected with a sliding block, the top of the adjusting rod is fixedly connected with a fixed fork, and a floating fork is rotationally connected into the fixed fork and used for rotating along with the shape of the soft groove and attaching to the bottom of the soft groove. The length of the adjusting rod is adjustable for adjusting the height distribution of the soft body groove; the simulation part comprises an erecting rod fixedly connected with the top of the base and an installed water tank, a spraying plate is installed at the top of the erecting rod, the water tank is communicated with the spraying plate, and the spraying plate is located above the soft body groove and used for simulating rainfall; according to the invention, the soft body groove can be bent into a desired trend, so that various simulation working conditions are provided, more actual conditions can be met, and more accurate data can be obtained.

The invention belongs to the technical field of clothing performance detection, and discloses a clothing waterproof performance evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: placing a clothing supporting device wearing a to-be-detected clothing and an evaluation inner shirt in a rainfall simulation device, and adjusting the rainfall parameters of the rainfall simulation device to evaluate the waterproof performance of the to-be-detected clothing; natural rainfall phenomena with different rainfall intensities are simulated, and water seepage scores of the to-be-detected clothes under the natural rainfall phenomena with the different rainfall intensities are determined according to the water seepage conditions of the evaluation underwear and the to-be-detected clothes under the natural rainfall phenomena with the different rainfall intensities. By simulating a real wearing scene and a variable rainfall environment, the water seepage score is determined according to the water seepage conditions of the evaluation underwear and the to-be-tested garment, so that the waterproof performance of the garment is evaluated, and the evaluation efficiency of the waterproof performance of the garment is improved.

The application discloses a device for simulating karst collapse under conditions of simulated rainfall and variable karst passages, which comprises a cover soil layer simulation box, a water head control mechanism arranged on the outer side of the cover soil layer simulation box, a rainfall mechanism arranged above the cover soil layer simulation box, a test soil body contained in the cover soil layer simulation box, a karst hole simulation opening formed in the bottom of the cover soil layer simulation box, and a karst cave simulation box arranged below the cover soil layer simulation box. A simulation pipeline is connected between the karst hole simulation opening and the karst cave simulation box, and the simulation pipeline corresponds to the shape of the simulated karst passage. The simulation pipeline is a hose. A pipeline shaping assembly is further arranged between the karst hole simulation opening and the karst cave simulation box, and the pipeline shaping assembly can shape the simulation pipeline into a required shape. The application can simulate variable karst passages.

The invention relates to a modeling method and system for a rainwater collection system based on gamma distribution and computer equipment. The method comprises the following steps: based on rainfall parameters including rainfall depth, rainfall duration and non-rainfall duration, simulating rainfall characteristics, and constructing a rainfall characteristic probability density function based on gamma distribution; simulating the runoff collected in the rainfall period to obtain the water amount of the runoff intercepted by the roof; simulating the residual water volume to obtain the range of the residual water volume when the rainfall cycle starts; simulating overflow based on the residual water quantity to obtain overflow; the probability density function, the water amount intercepted by the roof and overflow are synthesized, and water-saving and waterlogging-reducing efficiency parameters are constructed. By adopting the method, random rainfall characteristics can be simulated with high precision, and the method has the characteristic of few occupied computing resources.

The application discloses a kind of simulation devices of multiple terraces of strike-slip fault dislocation, including experiment table, combination experiment box being set on experiment table, sliding assembly being set at the bottom of combination experiment box for adjusting position, lifting assembly being connected on combination experiment box for adjusting space parameter and rainfall assembly being set above combination experiment box for simulating rainfall, by the present application, combination experiment box is adjusted in multiple times lifting during strike-slip fault simulation process, to simulate the complex lifting history of crust in nature, and the formation of river terrace controlled by it, the structure of the present application is simple, easy to operate, easy to implement.

The test device comprises a supporting frame and a test cylinder installed at the upper end of the supporting frame, a permeable base plate is detachably connected to the position, close to an opening in the lower end of the test cylinder, of the inner wall of the test cylinder, and a multi-stage inverted filter layer is detachably connected to the upper end of the permeable base plate; a plurality of monitoring assemblies and thermocouples are arranged on the inner wall of the test cylinder, a lower end opening of the test cylinder is communicated with a liquid guide hopper in a matched mode, a negative pressure regulation and control assembly is arranged on one side of the supporting frame, a water spraying assembly is detachably connected to the upper end of the outer wall of the test cylinder, a liquid supply assembly is arranged on the other side of the supporting frame, and a micropore injection and infiltration assembly is arranged on one side of the water spraying assembly. A plurality of guide grooves are formed in the inner wall of the test cylinder, the outer wall of the test cylinder is wrapped with a temperature control assembly, and a control cabinet is installed on one side of the upper end of the supporting frame. According to the invention, the unsaturated infiltration process under complex natural conditions such as rainfall and underground water level change can be simulated, slurry can be uniformly distributed in a soil body, and the discreteness of a mineralization effect is reduced.

The invention belongs to the technical field of artificial rainfall simulation, and particularly relates to a rainfall intensity adjusting and controlling system and device of an artificial rainfall device. According to the invention, through dynamic closed-loop control, each spraying unit can be adjusted in real time according to local monitoring data, drastic rainfall intensity fluctuation caused by non-uniform water power distribution of a pipe network is eliminated to the greatest extent, water pressure and flow of the spraying units and the whole simulated rainfall area are accurately regulated and controlled, and simulation distortion of the area rainfall process is avoided; meanwhile, unnecessary opening degree adjustment of a pump station and a valve is reduced, energy consumption is reduced, multi-stage modules are clear in labor division, initial regulation, water pressure compensation and dynamic fine adjustment are conducted, the rapid response and self-adaptive capacity is achieved, convergence to the target strength can be achieved in a short time, modular design is achieved, all subsystems are clear in responsibility, and the system is suitable for large-scale popularization and application. And flexible adjustment can be realized according to project scale or special requirements without large-scale overall transformation.

The present application belongs to the technical field of soil centrifuge simulation rainfall test, and discloses a rainfall device for improved centrifugal model rainfall test. The rainfall device comprises a centrifugal box, a rainfall module and a fixing module. The rainfall module is arranged above the centrifugal box to simulate rainfall, and the fixing module is used for fixing the rainfall module above the centrifugal box. The rainfall module comprises a water source, an atomizer water pump and a water outlet unit connected by a water delivery pipe in sequence. The atomizer water pump is used for providing atomized water pressure in the water delivery pipe. The water outlet unit comprises a U-shaped water delivery pipe and a nozzle. The height of the inner wall of the top of the water inlet pipe of the U-shaped water delivery pipe is lower than the height of the inner wall of the bottom of the water outlet pipe, so as to prevent the water in the U-shaped pipe from overflowing to form a cavity. Through the present application, the problems of nozzle leakage, cavity in the pipe, rainfall delay and uneven distribution of rainfall on the surface of the soil under the combined action of gravity, Coriolis force and centrifugal force are solved.

The invention provides a soil column environment multi-scene simulation comprehensive test device and method, and belongs to the field of environmental geotechnical engineering. The device comprises a simulation box, a soil column unit, a wind erosion water level control unit, a temperature control system, a sunlight rainfall simulation system and a wind power simulation system. The simulation box is provided with an access door, a splash-proof rain cover, a ventilation grid, a permeable grid and a drainage pipe. The soil column unit is composed of a liquid collecting bottle, a base, a hollow cylinder set and a wind erosion water level control mechanism and can simulate different heat exchange working conditions. The wind erosion water level control unit drives the flexible waterproof cloth to ascend and descend through a motor, and wind erosion and water level control is achieved. The temperature control system adjusts the temperature in the box through the cold-heat exchange pipe. The sunlight and rainfall simulation system simulates rainfall and sunlight through a shower head and a sunlight irradiation lamp. The wind power simulation system generates stable airflow through the axial flow fan array. According to the invention, various environment scenes can be simulated at the same time, and the characteristic change of soil under different environment conditions can be accurately researched.

The utility model relates to the field of experimental devices, in particular to an experimental device capable of simulating various rainfall environments, which comprises a support bedplate and a test component, a test assembly used for simulating various rainfall environments is installed at the upper end of the supporting table plate, the test assembly comprises an experiment frame, two rotating cylinders, a driving motor, a conveying pipe, a flow dividing pipe, a communicating sleeve, a heating rod, an observation window, a water storage tank, a control panel and a rain gauge, the experiment frame is located at the upper end of the supporting table plate, and the two rotating cylinders are arranged in the experiment frame; multiple groups of through holes are formed around the outer walls of the rotating cylinders, and driving motors are arranged at one ends of the two groups of rotating cylinders on the outer wall of the experiment frame; the driving motor is adopted to drive the two rotating cylinders to rotate, the rotating speed and the angle of the rotating cylinders are adjusted according to experiment requirements, simulated rainfall with different raindrop sizes and distribution is generated, rainfall parameters are rapidly adjusted, different research purposes and experiment conditions are adapted, and the flexibility and the diversity of experiments are improved.

The invention relates to the technical field of slope engineering, and discloses a soil slope partition rainfall test device, a test box comprises a box body and a slope model, the slope model comprises a plurality of rainfall simulation areas, the bottom of a rain baffle is separated from the slope model, and a rainfall spraying mechanism comprises a water conveying pipe and a pressure nozzle. The rainfall simulation area located in the non-rainfall area is covered with a waterproof film, and a waterproof film is installed at the junction between the rainfall simulation area located in the non-rainfall area and the rainfall simulation area located in the rainfall area; the invention further discloses a test method of the soil slope partition rainfall test device. Test preparation; rainfall simulation: selecting a rainfall simulation area, covering a waterproof film and installing a rainproof plate; collecting data; according to the invention, the rainfall range of each region is effectively controlled, and precise simulation of local soil saturation, shear strength reduction and local failure mechanism of the slope under the rainfall condition is realized.

The utility model discloses an artificial simulated rainfall calibration system which comprises a rainwater collector, a water inlet connecting pipe, a rainwater temporary storage device, a middle connecting pipe, a water pumping connecting pipe and a rainfall sensor. The input end of the rainwater collector is used for collecting rainwater simulating rainfall, and the output end of the rainwater collector is connected with one end of the water inlet connecting pipe; the other end of the water inlet connecting pipe is connected with the output end of the rainwater temporary storage device; the other end of the rainwater temporary storage device is connected with one end of the middle connecting pipe, the other end of the middle connecting pipe is connected with the water pumping connecting pipe, and the water pumping connecting pipe is used for draining rainwater in the rainwater temporary storage device; the rainfall sensor is arranged on the outer side of the rain collector and is configured to detect rainfall and rainfall intensity within a period of time. The method is high in repeatability, can accurately measure and calibrate the rainfall amount and the rainfall intensity of artificial simulation rainfall, and reduces the labor burden.

The present invention provides a test device for simulating the migration process of pollutants under the action of temperature-moisture coupling, belonging to the field of soil environmental science research. The test device includes a variable-pressure gas supply device, a soil column pipe, an exhaust device, a simulated rainfall system, simulated evaporation and illumination equipment, and a data acquisition and analysis system. The variable-pressure gas supply device includes a polluted gas storage tank and a pressure controller; the soil column pipe includes an air inlet cavity, a simulated soil column cavity, and an exhaust cavity, and a sampling hole is left on the simulated soil column cavity; the data acquisition and analysis equipment includes a distributed optical fiber, a data acquisition instrument, a computer, and a gas chromatograph. The test device and test method provided by the present invention can accurately control temperature and humidity, simulate rainfall, evaporation, and illumination, and are applicable to a variety of soil types. The data is recorded in real time by a high-precision monitoring system to reveal the diffusion, convection, and adsorption patterns of gases in the soil.

The application provides a kind of urban rainfall area IDF curve establishment constraint method and system, comprising: collecting measured rainfall data, GCM simulation rainfall data;Establish spatial downscaling model, carry out spatial downscaling to the grid monthly rainfall of future period estimated by GCM;Calculate the conditional transition probability of each calendar month rainfall occurrence in future period;Generate the parameter set of driving random rainfall generator, input it into random rainfall generator to obtain future period daily rainfall sequence;Carry out time discretization of daily scale to hour scale to future period daily rainfall sequence;Extract annual maximum value sequence from future period hourly rainfall sequence to carry out regional frequency analysis, and construct urban rainfall regional IDF curve;Construct random forest model, and deduce the alternative factor of IDF curve migration change;Emergent constraint model is constructed, and the uncertainty of urban rainfall risk prediction under future climate change is reduced.The application improves the accuracy of rainfall frequency analysis.

The present application relates to the technical field of distance measurement, and particularly relates to a rain-shielded target terahertz one-dimensional range image measuring device. The device comprises a rain channel, a terahertz radar, a target and a rotary table. The rain channel is an equal cross-section channel with a rectangular cross section, and the rain channel is provided with multiple rain devices. Each rain device comprises multiple spray heads arranged at intervals on the top of the rain channel, and the rain devices are connected in parallel and controlled separately. The terahertz radar is arranged outside the front end of the rain channel and on the central extension line of the front end surface. The target is arranged outside the rear end of the rain channel and on the central extension line of the rear end surface, and the target is placed on the rotary table and rotates with the rotary table. The distance between the terahertz radar and the target satisfies that the radar beam of the terahertz radar does not interfere with the rain channel and completely covers the target. The working condition of the terahertz radar in the rain environment can be effectively simulated, and the one-dimensional range image of the target under the rain curtain shielding can be obtained by using the terahertz radar.

The utility model discloses a simulation test device for an anti-icing coating of a locomotive bogie, which belongs to the technical field of anti-icing simulation test devices and comprises a movable base, a water tank, refrigeration equipment and a filter plate, a test box is arranged on the upper surface of the movable base, and the filter plate is horizontally fixed in the test box. The test box has the advantages that by arranging the water tank, the water pump, the water spraying disc and the refrigeration equipment, water in the water tank can be pumped out through the water outlet pipe and the water guide pipe by controlling operation of the water pump, the water can be evenly sprayed into the test area through the water spraying disc, and therefore the rainfall environment is simulated in the test area; and meanwhile, the refrigeration equipment provides cooling and refrigeration effects in the test area and simulates a low-temperature environment, so that a low-temperature rainfall environment is simulated for the locomotive bogie placed in the test box, the anti-icing and anti-freezing effects of the anti-icing coating of the locomotive bogie are conveniently tested, the automatic simulation test of the anti-icing coating of the locomotive bogie is realized, and the operation is relatively simple.