CN113686591B - Rainfall simulation method for intelligent network-connected automobile - Google Patents
Rainfall simulation method for intelligent network-connected automobile Download PDFInfo
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- CN113686591B CN113686591B CN202110973598.2A CN202110973598A CN113686591B CN 113686591 B CN113686591 B CN 113686591B CN 202110973598 A CN202110973598 A CN 202110973598A CN 113686591 B CN113686591 B CN 113686591B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a rainfall simulation method for an intelligent network-connected automobile, and belongs to the technical field of vehicle testing. The rainfall simulation method comprises the following steps: determining the type of a rainfall simulation device; determining rainfall characteristic parameters of the simulated rainfall; the rainfall characteristic parameters comprise rainfall height h, rainfall uniformity F, rainfall intensity I and rainfall wind speed W; determining model design association factors of each rainfall characteristic parameter; obtaining a design model of each rainfall characteristic parameter; and constructing a rainfall simulation test road. The rainfall simulation method of the invention firstly determines the type of the rainfall simulation device and provides a plurality of rainfall characteristic parameters, when a rainfall simulation test road is established, according to the requirements of vehicles on each rainfall characteristic parameter, the design model of each rainfall characteristic parameter is combined, so that the corresponding setting parameters of the rainfall simulation device can be easily obtained, and the real rainfall environment can be more reliably simulated.
Description
Technical Field
The invention relates to the technical field of vehicle testing, in particular to a rainfall simulation method for an intelligent network-connected automobile.
Background
With the rapid development of intelligent network automobiles, the severe simulation test of the automobiles in various environments becomes a necessary program before the mass production of the automobiles, so that a test field of the intelligent network automobiles is particularly required to be built; the rainfall simulation test road is an important component of test field construction, and a rainfall environment is simulated by utilizing a rainfall simulation device on the rainfall simulation test road, so that the traffic safety of vehicles under the rainfall environment condition, the recognition condition of vehicle sensing equipment on a target object and the like are detected.
The conventional rainfall simulation device mostly adopts the traditional artificial rainfall form used in the agricultural field or spray irrigation, and mostly only considers the final falling speed of the raindrops, and the quantitative design of other indexes is not involved, so that the rainfall environment cannot be simulated truly and reliably, and the testing requirement cannot be met.
Accordingly, there is a need to provide a rainfall simulation method for intelligent network-connected vehicles, which solves the above problems.
Disclosure of Invention
The invention aims to provide a rainfall simulation method for an intelligent network-connected automobile, which aims to solve the problems that only the final falling speed of raindrops is considered, the quantitative design of other indexes is not involved, and the rainfall environment cannot be simulated truly and reliably in the prior art.
In order to achieve the above object, the following technical scheme is provided:
a rainfall simulation method for an intelligent network-connected automobile comprises the following steps:
s1: determining the type of a rainfall simulation device;
s2: determining rainfall characteristic parameters of the simulated rainfall; the rainfall characteristic parameters comprise rainfall height h, rainfall uniformity F, rainfall intensity I and rainfall wind speed W;
s3: determining model design association factors of each rainfall characteristic parameter according to the type of the rainfall simulation device;
s4: obtaining a design model of each rainfall characteristic parameter;
s5: and according to the requirements of the vehicle on each rainfall characteristic parameter, constructing a rainfall simulation test road by combining the design model of each rainfall characteristic parameter.
Further, in step S1, the rainfall simulation device includes a plurality of water supply pipelines arranged in parallel, and the extending direction of the water supply pipelines is consistent with the extending direction of the rainfall simulation test road; the spray heads on the water supply pipeline are distributed in a matrix mode, and the spray heads are downward spray type spray heads.
Further, in step S3, the rainfall levelThe model design correlation factor for h includes: vehicle height change factor k 1 Angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 ；
The model design correlation factors of the rainfall uniformity F include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 Distance change factor k of adjacent spray heads 6 Distance change factor k between adjacent water supply lines 7 ；
The model design correlation factors of rainfall intensity I include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 The cross-sectional area change factor k of the water outlet 8 ；
The model design correlation factor of the rainfall wind speed W comprises: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 。
Further, the design model of the rainfall height h is:
wherein h is 0 For the height of the vehicle, h 1 H is the minimum travel height at which all raindrops can vertically drop onto the vehicle max Limiting the height to a maximum limit for the vehicle; θ is the included angle of the rainfall spray head, Δp is the pipeline pressure difference, C is the pipeline pressure loss coefficient, ρ is the raindrop density, f is the raindrop air resistance, k is the air resistance coefficient, and m is the raindrop mass.
Further, the design model of the rainfall uniformity F is:
wherein S is 1 Areas of patterns formed for connecting adjacent spray heads S 2 S for effectively reducing the projection area of the shower nozzle rainfall on the ground in the rainfall area 1 ＝ab，a is the distance between adjacent spray heads in the same water supply pipeline, and b is the distance between adjacent water supply pipelines.
Further, the rainfall intensity I design model is as follows:
wherein Q is the outlet flow of the spray head, and A is the cross-sectional area of the water outlet.
Further, the design model of the rainfall wind speed W is:
wherein ω is the angular velocity of the showerhead.
Further, the rainfall simulation method further comprises the following steps: and combining with meteorological information, statistically analyzing annual wind direction data of the region where the rainfall simulation test road is located, finding out dominant wind direction, and taking the dominant wind direction as the construction direction of the rainfall simulation test road.
Further, the rainfall intensity I is realized by controlling the flow of the water supply pipeline through the electromagnetic valve.
Further, the width boundaries of the plurality of water supply lines are located outside the lanes of the rainfall simulation test road and have 5% -10% of design redundancy value.
Compared with the prior art, the invention has the beneficial effects that:
the rainfall simulation method for the intelligent network-connected automobile firstly determines the type of the rainfall simulation device and provides a plurality of rainfall characteristic parameters, and then obtains the model design correlation factor of each rainfall characteristic parameter according to the corresponding rainfall simulation device type, thereby being beneficial to finally obtaining the accurate design model of each rainfall characteristic parameter; when the rainfall simulation test road is constructed, according to the requirements of the vehicle on each rainfall characteristic parameter, the setting parameters of the corresponding rainfall simulation device are easily obtained by combining the design model of each rainfall characteristic parameter, so that the constructed rainfall simulation test road can more reliably simulate the real rainfall environment to meet the test requirement and improve the accuracy of vehicle test.
Drawings
FIG. 1 is a flow chart of a rainfall simulation method for an intelligent network-connected vehicle in an embodiment of the invention;
FIG. 2 is a schematic diagram of a rainfall simulation device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a spray head spraying raindrops according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the velocity of a droplet falling in an embodiment of the present invention;
fig. 5 is a schematic diagram showing an arrangement of adjacent spray heads of the rainfall simulation device in the embodiment of the invention.
In the figure:
10. a reservoir; 20. a water pump; 30. a flow regulating valve; 40. a water separator; 50. a filter; 60. an electromagnetic valve; 70. a water supply line; 80. a spray head.
Detailed Description
The following detailed description of the embodiments of the invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a rainfall simulation method for an intelligent network-connected automobile, which is mainly used for the construction of a rainfall simulation test road in a test field of the intelligent network-connected automobile so as to simulate the rainfall environment more truly, thereby being beneficial to detecting the traffic safety of the automobile under the rainfall environment condition, the identification condition of a target object by vehicle sensing equipment and the like. Specifically, the construction of the rainfall simulation test road comprises the design of each setting parameter of the rainfall simulation device arranged on the test road and the design of indexes such as the width, the extending direction and the like of the test road.
Specifically, referring to fig. 1, the rainfall simulation method for the intelligent network-connected vehicle includes the steps of:
s100: determining the type of a rainfall simulation device;
s200: determining rainfall characteristic parameters of the simulated rainfall; the rainfall characteristic parameters comprise rainfall height h, rainfall uniformity F, rainfall intensity I and rainfall wind speed W;
s300: determining model design association factors of each rainfall characteristic parameter according to the type of the rainfall simulation device;
s400: obtaining a design model of each rainfall characteristic parameter;
s500: and according to the requirements of the vehicle on each rainfall characteristic parameter, constructing a rainfall simulation test road by combining the design model of each rainfall characteristic parameter.
For step S100, because the forms of the rainfall simulation devices for simulating rainfall are various, the setting parameters of each rainfall simulation device are different, and only if the specific type of the rainfall simulation device is determined, it can be further determined which of the setting parameters required to be adjusted for rainfall simulation and the model design association factors related to the rainfall characteristic parameters are.
Aiming at step S200, the rainfall simulation test road provided by the embodiment can meet the requirements of a plurality of rainfall characteristic parameters including the rainfall height h, the rainfall uniformity F, the rainfall intensity I and the rainfall wind speed W, and compared with the situation that the final dropping speed of the raindrops is mostly considered in rainfall simulation in the prior art, the real rainfall environment can be simulated more, the testing requirement is met, and the accuracy of vehicle testing is improved.
In step S300, on the premise of determining the rainfall simulation device and the rainfall characteristic parameters, the model design correlation factors of each rainfall characteristic parameter of the rainfall simulation can be determined. The rainfall simulation device has a plurality of variables, the variables of different rainfall simulation devices are different, and the variables affecting different rainfall characteristic parameters are also different, so that model design correlation factors of each rainfall characteristic parameter are obtained in step S300, and the accurate establishment of a design model of the subsequent rainfall characteristic parameter is facilitated.
For step S400 and step S500, firstly, a design model of each rainfall characteristic parameter is established, after the model is established, as the vehicle performance of the vehicle under different rainfall characteristic parameters needs to be tested in a rainfall simulation test, the specific values of each setting parameter of the rainfall simulation device are obtained by combining the design model of each rainfall characteristic parameter according to the requirements of the vehicle on each rainfall characteristic parameter, and then the construction of a rainfall simulation test road is completed.
In summary, in the rainfall simulation method for the intelligent network-connected vehicle in the embodiment, the type of the rainfall simulation device is determined, a plurality of rainfall characteristic parameters are provided, and then the model design correlation factor of each rainfall characteristic parameter is obtained according to the corresponding rainfall simulation device type, so that the accurate design model of each rainfall characteristic parameter is obtained finally; when the rainfall simulation test road is constructed, according to the requirements of the vehicle on each rainfall characteristic parameter, the setting parameters of the corresponding rainfall simulation device are easily obtained by combining the design model of each rainfall characteristic parameter, so that the constructed rainfall simulation test road can more reliably simulate the real rainfall environment to meet the test requirement and improve the accuracy of vehicle test.
Specifically, referring to fig. 2, the present embodiment further provides a rainfall simulation device, which includes a plurality of water supply pipelines 70 arranged in parallel, and an extending direction of the water supply pipelines 70 is consistent with an extending direction of a rainfall simulation test road; a plurality of spray heads 80 are arranged on each water supply pipeline 70 at intervals, so that the spray heads 80 on the water supply pipelines 70 are distributed in a matrix. Further, the spray head 80 is a downward spray type spray head to ensure that water is sprayed onto the rainfall simulation test road from top to bottom. Still referring to fig. 2, the rainfall simulation device further includes a water reservoir 10, a water separator 40, a filter 50 and a solenoid valve 60 sequentially connected at the front end of the water supply, wherein the water reservoir 10 is used for storing rainfall water, a water pump 20 can be arranged on the water reservoir to provide power to pump the water into a water supply pipeline 70, and a flow regulating valve 30 can be also arranged to regulate the total water supply amount; the water separator 40 is used for distributing water pumped by the water pump 20 to different water supply pipelines 70 according to the requirement, so as to realize uniform spraying; a filter 50 may be provided after the water separator 40 for filtering impurities in the water to avoid clogging of the spray head 80; the electromagnetic valve 60 is disposed at the front end of each water supply pipeline 70, and is used for controlling the flow rate of the water supply pipeline 70, thereby realizing the control of rainfall intensity I.
After determining the type of the rainfall simulation device as shown in fig. 2, the model design correlation factor of the relevant rainfall characteristic parameter can be obtained. Specifically, the model design correlation factor of the rainfall height h includes: vehicle height change factor k 1 Angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 The method comprises the steps of carrying out a first treatment on the surface of the The model design correlation factors of the rainfall uniformity F include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 Distance change factor k of adjacent spray heads 6 Distance change factor k between adjacent water supply lines 7 The method comprises the steps of carrying out a first treatment on the surface of the The model design correlation factors of rainfall intensity I include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 The cross-sectional area change factor k of the water outlet 8 The method comprises the steps of carrying out a first treatment on the surface of the The model design correlation factor of the rainfall wind speed W comprises: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 。
Further, in this embodiment, the design model of the rainfall height h is:
wherein h is 0 For the height of the vehicle, h 1 H is the minimum travel height at which all raindrops can vertically drop onto the vehicle max Limiting the height to a maximum limit for the vehicle; θ is the included angle of the rainfall spray head, Δp is the pipeline pressure difference, C is the pipeline pressure loss coefficient, ρ is the raindrop density, f is the raindrop air resistance, k is the air resistance coefficient, and m is the raindrop mass.
The design model of the rainfall height h is obtained by the following method:
referring to fig. 3 and 4, all raindrops in the spray head 80 are sprayed in a fan shape in the vertical plane, and the included angle θ of the raindrop spray head is the central angle of the fan shape; in addition to the fact that the raindrops at the center are directly and vertically dropped, the initial velocity v of the raindrops in other ranges 0 Is inclined, in FIG. 4, for the initial velocity v of the raindrops 0 Decomposing to obtain a horizontal velocity v x The method comprises the steps of carrying out a first treatment on the surface of the And once the horizontal velocity v of the outermost droplet x When the height of the water drop is 0, the water drop can vertically drop onto the vehicle, other raindrops can necessarily vertically drop onto the vehicle, and the travel height of the water drop at the outermost side is h 1 In the present embodiment, h is 1 As the minimum travel height at which all raindrops can drop vertically onto the vehicle. For the outermost water drop, its horizontal velocity v x Satisfy the following requirementsWhen the horizontal velocity is v x When the drop is 0, the raindrops can only vertically drop, and the maximum value of the spray radius of the spray head is r max ，r max And is also the maximum travel of the outermost raindrops in the horizontal direction. Since the raindrops are exposed to air resistance when moving in the horizontal direction until being horizontally dividedVelocity v x Becomes 0, thus r of raindrop max And also meet the following requirementsWherein the kf/m ratio change factor is k 5 . Referring to fig. 3, all raindrops can vertically drop to a minimum travel height h on the vehicle 1 Also satisfy->
The outlet flow of the spray head is regulated to be Q, the cross section area of the water outlet is regulated to be A, and thenObtaining
In addition, since the maximum limit height of the vehicle is h max And the vehicle height change factor is k 1 Thus, h 0 ＝k 1 h max (equation five). In the present embodiment, the vehicle maximum limit height h max 6.5m.
From the above formulas one to four, it is possible to obtain
In practice, it should be ensured that all raindrops fall vertically onto the vehicle, so that the rain level h is at least equal to the vehicle level h 0 Minimum travel height h which can be lowered vertically to the vehicle with all raindrops 1 A kind of electronic device. Therefore, by combining the formula five, a design model of the rainfall height h can be obtained naturally:
that is, it is only necessary to set the height of the shower head 80 of the rainfall simulation device to at least h, so that all raindrops can be ensured to vertically drop on the vehicle.
In a specific embodiment, the maximum limit height h of the vehicle to be tested max 6.5m and k 1 The value is 1.05-1.1, then h is 0 The value range is 6.825-7.15; then obtaining h according to the values of other parameter variables and model design association factors 1 The value range of the rainfall height h is 1.15-1.75, and the rainfall height h is as follows: h is greater than or equal to h 0 +h 1 Thus taking h 0 Maximum value of 7.15 and h 1 The maximum value of (1.75) is equal to or more than 7.15+1.75, namely, h is equal to or more than 8.9; that is, when constructing a rainfall simulation test road under the above conditions, the spray head 80 should be set at a height of at least 8.9m so that the rainfall height h that can be achieved by the rainfall simulation device is at least 8.9m.
Further, the design model of the rainfall uniformity F is obtained by the following method:
referring to fig. 5, for the nozzles 80 distributed in a matrix in the present embodiment, a is the distance between adjacent nozzles in the same water supply line, and b is the distance between adjacent water supply lines; s is S 1 The area of the pattern formed by the adjacent nozzle 80 is rectangular, S, because the nozzles 80 are distributed in matrix 1 ＝ab；S 2 In order to effectively reduce the projection area of the shower nozzle rainfall on the ground in the rainfall area,then the design model for the rainfall uniformity F is:
in a specific embodiment, if the rainfall uniformity F is required to be greater than a certain value, the values of the setting parameters a and b of the rainfall simulation device can be obtained according to the values of other parameter variables and model design association factors, and the rainfall simulation test road construction under the setting parameters is performed.
For the rainfall intensity I, the drop in unit area per unit time in this embodimentThe volume of rain is embodied, i.eAnd q=v 0 A，Therefore, the rainfall intensity I design model is:
similarly, in a specific embodiment, according to the requirement on the rainfall intensity I in the rainfall simulation process, a corresponding value range of the outlet flow of the spray nozzle is obtained, so that the setting parameters of the rainfall simulation device can be set correspondingly.
In this embodiment, the nozzle 80 of the rainfall simulation device is a rotatable nozzle, where the rotatable nozzle is capable of rotating in a horizontal plane to simulate different wind speeds, and the angular speed of the nozzle is set to be ω; it is also shown that spray head 80 may deflect in a vertical plane to simulate a raining environment in different wind conditions.
Further, in this embodiment, the design model of the rainfall wind speed W is:
in a specific embodiment, when the rainfall wind speed W is required to be within a certain value range, the value range of the angular velocity omega of the spray nozzle in the setting parameters of the rainfall simulation device can be obtained according to the values of other parameter variables and the model design correlation factors, and specific guidance is provided for the rainfall simulation road construction.
The rainfall simulation method provided by the embodiment further comprises the following steps: the method comprises the steps of combining weather information, statistically analyzing annual wind direction data of a region where a rainfall simulation test road is located, finding out dominant wind direction, and taking the dominant wind direction as a construction direction of the rainfall simulation test road; the purpose of setting like this is to make the raindrop drop to test road as far as possible, avoids being blown out to test road outside by the wind when perpendicular or being the contained angle with the wind direction, can't cover rainfall test road completely, influences the authenticity and the reliability of rainfall simulation. For example, if the dominant wind direction of the region where the rainfall simulation test road is located is southeast wind, the extending direction of the rainfall simulation test road is southeast direction, and if the extending direction of the rainfall simulation test road is northwest direction, it is obvious that raindrops ejected from the nozzle 80 are easily blown out of the road by southeast wind. Of course, in implementation, this step is not related to the design model of the rainfall characteristic parameter, and may be placed before step S100 or may be optionally placed after step S500.
Further, the rainfall simulation test road is generally designed to be two-lane wide, in order to ensure that the road is covered by rainfall as much as possible in the rainfall simulation process, the width boundaries of the plurality of water supply pipelines 70 in the rainfall simulation device are positioned outside the lanes, and the rainfall simulation device has 5% -10% of design redundancy value; that is, for the plurality of water supply lines 70 arranged in parallel, the overall width of the water supply lines is slightly larger than the width of the rainfall simulation test road, so that the situation that the edge of the rainfall simulation test road cannot be covered by raindrops is avoided.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (4)
1. The rainfall simulation method for the intelligent network-connected automobile is characterized by comprising the following steps of:
s1: determining the type of a rainfall simulation device;
s2: determining rainfall characteristic parameters of the simulated rainfall; the rainfall characteristic parameters comprise rainfall height h, rainfall uniformity F, rainfall intensity I and rainfall wind speed W;
s3: determining model design association factors of each rainfall characteristic parameter according to the type of the rainfall simulation device;
s4: obtaining a design model of each rainfall characteristic parameter;
s5: according to the requirements of the vehicle on each rainfall characteristic parameter, combining with a design model of each rainfall characteristic parameter, and constructing a rainfall simulation test road;
in the step S1, the rainfall simulation device comprises a plurality of water supply pipelines which are arranged in parallel, and the extending direction of the water supply pipelines is consistent with the extending direction of a rainfall simulation test road; the spray heads on the water supply pipe are distributed in a matrix mode, and the spray heads are downward spray type spray heads;
in step S3, the model design correlation factor of the rainfall height h includes: vehicle height change factor k 1 Angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Line pressure loss factor k 4 Raindrop air resistance and mass ratio change factor k 5 ；
The model design correlation factors of the rainfall uniformity F include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 Distance change factor k of adjacent spray heads 6 Distance change factor k between adjacent water supply lines 7 ；
The model design correlation factors of rainfall intensity I include: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 The cross-sectional area change factor k of the water outlet 8 ；
The model design correlation factor of the rainfall wind speed W comprises: angle change factor k of rainfall spray head included angle 2 Line pressure change factor k 3 Coefficient of line pressure loss variation factor k 4 Raindrop air resistance and mass ratio change factor k 5 ；
The design model of the rainfall height h is as follows:
wherein h is 0 For the height of the vehicle, h 1 H is the minimum travel height at which all raindrops can vertically drop onto the vehicle max Limiting the height to a maximum limit for the vehicle; θ is the included angle of the rainfall spray head, Δp is the pipeline pressure difference, C is the pipeline pressure loss coefficient, ρ is the raindrop density, f is the raindrop air resistance, k is the air resistance coefficient, and m is the raindrop mass;
the design model of the rainfall uniformity F is as follows:
wherein S is 1 Areas of patterns formed for connecting adjacent spray heads S 2 S for effectively reducing the projection area of the shower nozzle rainfall on the ground in the rainfall area 1 =ab，S 2 =πr 2 max The method comprises the steps of carrying out a first treatment on the surface of the a is the distance between adjacent spray heads in the same water supply pipeline, and b is the distance between adjacent water supply pipelines;
the rainfall intensity I design model is as follows:
wherein Q is the outlet flow of the spray head, A is the cross-sectional area of the water outlet;
the design model of the rainfall wind speed W is as follows:
wherein ω is the angular velocity of the showerhead.
2. The rainfall simulation method according to claim 1, wherein the rainfall simulation method further comprises the steps of: and combining with meteorological information, statistically analyzing annual wind direction data of the region where the rainfall simulation test road is located, finding out dominant wind direction, and taking the dominant wind direction as the construction direction of the rainfall simulation test road.
3. The rainfall simulation method according to claim 1, wherein the rainfall intensity I is achieved by controlling the flow of the water supply line by a solenoid valve.
4. The rainfall simulation method of claim 1 wherein the width boundaries of the plurality of water supply lines are located outside the lanes of the rainfall simulation test road and have a design redundancy value of 5% -10%.
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| CN116481831B (en) * | 2023-04-14 | 2025-05-06 | 岚图汽车科技有限公司 | Vehicle rainy day simulation test method, device, equipment and readable storage medium |
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