CN113155407A - Automobile aerodynamic standard model with intelligent sensing function - Google Patents
Automobile aerodynamic standard model with intelligent sensing function Download PDFInfo
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- CN113155407A CN113155407A CN202110524272.1A CN202110524272A CN113155407A CN 113155407 A CN113155407 A CN 113155407A CN 202110524272 A CN202110524272 A CN 202110524272A CN 113155407 A CN113155407 A CN 113155407A
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- 238000004088 simulation Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims description 8
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- 230000008447 perception Effects 0.000 claims description 4
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- 238000012360 testing method Methods 0.000 abstract description 26
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- G—PHYSICS
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- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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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
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Abstract
The invention relates to the technical field of automobile aerodynamic data testing, in particular to an automobile aerodynamic standard model with an intelligent sensing function, which comprises the following components: a vehicle body; the back, the back can be dismantled with the automobile body and be connected. According to the invention, the back is detachably connected with the vehicle body, and the change of various vehicle types can be rapidly realized by replacing backs with different shapes, so that the stress conditions of different vehicle types in a flow field and the flow conditions of the flow field near the vehicle types can be rapidly obtained through wind tunnel tests or simulation calculation; in addition, a plurality of sensor arrangement areas are designed on the vehicle body, so that the standard model can be combined with each sensor to obtain the environmental physical quantity parameters around the vehicle body and the response parameters of the vehicle body, and the intelligent sensing function is realized; compared with the traditional aerodynamic model, the model has the characteristics of multiple shapes and multiple functions.
Description
Technical Field
The invention relates to the technical field of automobile aerodynamic data testing, in particular to an automobile aerodynamic standard model with an intelligent sensing function.
Background
In wind tunnel testing, foreign researchers provide standard models with distinct characteristics for automobile aerodynamic research, the standard models not only provide an optimized reference scheme for automobile appearance design and evaluation, but also provide benchmarking and verification models for automobile wind tunnel test benchmarking, calibration, test technology development, CFD calculation accuracy inspection and the like. In addition, by means of the standard model, communication in the automobile aerodynamic industry is enhanced, and the communication language is formed.
To date, various aerodynamic models of automobiles have been developed abroad. The models are classified according to the complexity of the pneumatic appearance of the models, and can be divided into simplified blunt body models, simple automobile models and complex automobile models, and the outlines and the surfaces of the models are more and more complex and are more and more close to real automobiles.
The traditional automobile aerodynamic research is carried out under a steady state or a quasi-steady state, the requirement on transient data testing capacity is not high, the unsteady state automobile aerodynamic has the characteristics of strong transient, strong flow field and strong aerodynamic correlation, and the like, most of the existing automobile wind tunnel steady state testing technologies can not accurately capture the characteristics, so that in order to smoothly carry out the unsteady state automobile aerodynamic research, a perception type aerodynamic standard model needs to be developed for the multi-physical-quantity combined measurement of the flow field, so as to further enhance the transient testing technology reserve, expand the wind tunnel testing means and provide a basis for carrying out the unsteady state automobile aerodynamic research.
In contrast, chinese patent CN111855138A discloses an automotive aerodynamic standard model, which is provided with a pose sensor and/or an environmental sensor; the pose sensor is used for testing parameters of the model, and the environment sensor is used for testing environment parameters; the pose sensor comprises one or more of a laser displacement sensor, an accelerometer and a micro gyroscope; the pose sensor comprises a laser displacement sensor, an accelerometer and a micro gyroscope; the accelerometer and the micro gyroscope are arranged at the position of a front window of the standard model; the laser displacement sensor is arranged at the bottom of the standard model and is arranged at the position, close to the wheel, of the bottom of the standard model; the standard model is provided with a plurality of laser displacement sensors, preferably four laser displacement sensors, which are respectively arranged at the positions close to the four wheels at the bottom of the standard model.
For a traditional aerodynamic model, the model is single and the function is single, and the model does not have the attributes of multiple models and multiple test functions, and cannot meet the requirement of multiple physical quantity measurement. When different automobile types need to be tested, the aerodynamic model needs to be manufactured again, so that the cost is too high and the time is too long in the early stage of the testing process.
Disclosure of Invention
The invention provides an automobile aerodynamic standard model with an intelligent sensing function, and solves the technical problems of single shape and single function of the existing aerodynamic model.
The basic scheme provided by the invention is as follows: an automotive aerodynamic standard model with intelligent perception functionality, comprising: the automobile tail comprises a head part, an automobile body part and a tail part, wherein the upper half part of the tail part comprises a back module which is detachably connected with the automobile body part and the lower half part of the tail part;
the front end of the car head part is provided with a front end sensor arrangement area, an engine compartment cover of the car head part is provided with an engine compartment cover sensor arrangement area, the top of the car body part is provided with a top sensor arrangement area, the rear side of the car tail part is provided with a tail sensor arrangement area, and the inside of the car body part is provided with a middle sensor arrangement area; the bottom of the vehicle body is provided with a bottom sensor arrangement area.
The working principle and the advantages of the invention are as follows: the back and the vehicle body are detachably connected, and the change of various vehicle types can be quickly realized by replacing backs with different shapes, so that the stress condition of different vehicle types in a flow field and the flow condition of the flow field near the vehicle types can be quickly obtained through wind tunnel tests or simulation calculation. When four types of common sedan cars, sliding back cars, SUV and pick-up cars need to be tested, only the corresponding backs need to be replaced. In addition, a plurality of sensor layout areas are designed on the vehicle body, so that the standard model can be combined with each sensor to acquire environmental physical quantity parameters around the vehicle body and response parameters of the vehicle body, and an intelligent sensing function is realized: the method is characterized in that the air flow flowing conditions around and on the surface of the vehicle body in the transient flow field and the transient response parameters of the vehicle body are required to be tested, and related environment physical quantity sensors such as temperature and humidity, air flow speed, turbulence and surface pressure measuring sheets can be arranged in the sensor arrangement areas at the front end, the engine compartment cover, the top and the tail to obtain the air flow flowing conditions around and on the surface of the vehicle body, and attitude sensors and laser range finders are arranged on a vehicle body chassis to obtain the vehicle body transient response parameters such as the vehicle body attitude and the ground clearance, so that the intelligent sensing function is realized. Compared with the traditional aerodynamic model, the model has the characteristics of multiple shapes and multiple functions.
Optionally, the back module comprises a sedan type, a walk-back type, an SUV type, and a pick-up type.
By replacing the back modules of different vehicle types, the time and the cost in the early stage of testing can be greatly reduced, the parameter variables can be obviously reduced, and the aerodynamic performance of the vehicle only caused by the change of the back modules can be more accurately measured.
Optionally, the volume of the back module accounts for 1/4-1/3 of the volume of the vehicle body.
Optionally, a framework is arranged in the vehicle body, and the vehicle head portion, the vehicle body portion and the vehicle tail portion are fixedly connected with the framework.
The vehicle body is reinforced through the framework, and the installation of other parts, sensors or data acquisition instruments is facilitated.
Optionally, be equipped with a plurality of locating pieces on the back module downside, the locating piece distributes along downside edge circumference, and the position and the quantity that correspond the locating piece on the skeleton are equipped with the assorted constant head tank.
Through locating piece and constant head tank, make things convenient for quick, the accurate installation of back module.
Optionally, a plurality of threaded holes are formed in the framework, a plurality of connecting seats are arranged on the inner side of the back module corresponding to the threaded holes, and connecting holes are formed in the connecting seats in a matching mode corresponding to the threaded holes.
The positioned back module is conveniently and firmly arranged on the framework.
Optionally, the back module is provided with a through hole corresponding to each connecting seat, a cover is covered on the through hole and hinged to the back module, and the outer surface of the cover is flush with the outer surface of the back module after the cover is covered.
Through the arrangement, the connecting structure of the back module and the framework can be hidden in the vehicle body, and the influence of the connecting structure on aerodynamic research is avoided.
Optionally, a rearview mirror module is detachably connected to each of two sides of the vehicle body portion.
Optionally, a heat dissipation cooling module is installed on the front side of the framework, the heat dissipation cooling module is located in the vehicle head portion, an air inlet grille is installed on the front side of the vehicle head portion, and the simulation engine system is installed on the inner side of the vehicle head portion.
The similarity between the model and a real automobile is improved, the complex pneumatic appearance of the real automobile is restored as much as possible, and the testing accuracy is improved.
Optionally, a support frame is arranged at a position, corresponding to the wheels of the vehicle body, on the framework, and a braking system is installed on the support frame.
Optionally, a connecting plate is installed on the framework corresponding to the position of the supporting frame, a plurality of first adjusting holes are arranged on the connecting plate along the vertical direction, the supporting frame comprises an adjusting plate, a plurality of second adjusting holes are formed in the adjusting plate corresponding to the first adjusting holes, and adjusting bolts are arranged in the second adjusting holes.
The height difference between the connecting plate and the adjusting plate is adjusted through the adjusting bolt, so that the ground clearance of the vehicle body is adjusted to be suitable for tires of various sizes.
Optionally, a support plate is fixedly connected to the adjusting plate, the braking system is fixed to an end portion of the support plate, and wheels are mounted on the braking system.
For wind tunnel tests, the support plate is used as a fulcrum for supporting, fixing or lifting the model.
Optionally, a chassis is mounted at the bottom of the framework.
The similarity between the model and a real automobile is improved, the complex pneumatic appearance of the real automobile is restored as much as possible, and the testing accuracy is improved.
Optionally, a simulation exhaust system, a simulation suspension, a simulation oil tank and a simulation lower guard plate are mounted on the chassis.
The similarity between the model and the real automobile is improved, the complex pneumatic appearance of the real automobile is restored as much as possible, and the testing accuracy is improved.
Optionally, a storage platform is arranged on the framework and located in the vehicle body.
The test instrument equipment is convenient to be arranged in the vehicle body.
Drawings
FIG. 1 is a schematic structural diagram of a vehicle body according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vehicle body replaceable rearview mirror module according to an embodiment of the present invention;
FIG. 3 is a schematic view illustrating the distribution of positioning slots according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the distribution of the holes on the vehicle body according to the first embodiment of the present invention;
FIG. 5 is an enlarged fragmentary view of FIG. 4 with the closure installed through the aperture;
fig. 6 is a schematic structural view of a sedan-type back module according to an embodiment of the invention;
FIG. 7 is a schematic structural view of a back module of a saddle back type according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a back module of an SUV vehicle according to a first embodiment of the present invention;
FIG. 9 is a schematic view of a rear module of a medium pick up truck in accordance with an embodiment of the present invention;
FIG. 10 is a perspective view of a skeletal structure in accordance with one embodiment of the present invention;
FIG. 11 is an enlarged view of a portion of the support bracket and the braking system according to an embodiment of the present invention;
FIG. 12 is a schematic view of four support points according to one embodiment of the present invention;
FIG. 13 is a schematic view of an air intake grille of the engine compartment according to the first embodiment of the present invention;
FIG. 14 is a schematic structural diagram of a cooling module mounted on a frame according to an embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a simulated engine system installed in an engine compartment according to an embodiment of the present invention;
FIG. 16 is a schematic structural diagram of a center platform according to an embodiment of the present invention;
FIG. 17 is a standard model of a conventional wind resistance test according to the third embodiment of the present invention;
FIG. 18 is a schematic view of a pressure measurement patch according to a fourth embodiment of the present invention;
FIG. 19 is a schematic diagram of a sensor arrangement for steady state wind, gust, and crosswind response measurements in accordance with a sixth embodiment of the present invention;
fig. 20 is a schematic diagram of sensor arrangement for steady-state wind, gust, and crosswind response measurement in a sixth embodiment of the present invention.
The reference numerals contained in the drawings include: the automobile comprises an automobile body 1, a head part 101, an automobile body part 102, a tail part 103, a replaceable rearview mirror module 2, a positioning groove 3, a through hole 4, a sealing cover 5, a connecting hole 6, a framework 7, a supporting frame 8, a connecting plate 9, an adjusting bolt 10, a brake system 11, a fulcrum 12, an air inlet grille 13, a heat dissipation cooling module 14, a simulation engine system 15, an object placing platform 16, a pressure measuring sheet 17, a posture sensor 18 and a laser range finder 19.
Detailed Description
The following is further detailed by the specific embodiments:
example one
Because the existing standard Model of the automobile aerodynamics can realize function limitation and cannot meet the requirement of measuring multiple physical quantities, the invention provides an intelligent standard Model of the automobile aerodynamics with a sensing function, namely a CAERI Aero Model. In the present embodiment, the standard model includes a vehicle body 1 (including a head portion 101, a body portion 102, and a tail portion 103), a back module, a chassis, and an engine compartment provided in the head portion 101 of the vehicle body 1.
For the vehicle body 1, as shown in fig. 1-2, the volume of the vehicle body 1 is three quarters of the whole vehicle, the vehicle body 1 is not provided with a back module, and the vehicle body 1 is provided with an air inlet grille 13, a replaceable rearview mirror module 2 and a detachable engine compartment cover; as shown in fig. 3, six conical positioning blocks are arranged on the back module, magnets are arranged at the centers of the six conical positioning blocks, and positioning grooves 3 are arranged on the framework 7 of the vehicle body 1 corresponding to the positioning blocks; the framework 7 is provided with a plurality of threaded holes; as shown in figure 4, the back module is provided with a plurality of connecting seats corresponding to the inner sides of the threaded holes, the connecting seats are provided with connecting holes 6 corresponding to the threaded holes, the back module is provided with a through hole 4 corresponding to each connecting seat, the through holes 4 are covered by a cover 5, the cover 5 is hinged to the back module, the cover 5 covers the outer surface of the cover 5 and the outer surface of the back module, and figure 5 is a partial enlarged view of the back module installed through the through holes 4 in figure 4 after the cover 5 is installed. The automobile body 1 is concave type, and the back module is protruding type, can realize the transform of multiple motorcycle type fast through changing different figurative back modules. For the back module, as shown in fig. 6, 7, 8 and 9, the back module includes four types of common sedan, slide back, SUV and pick up cars, and the back module is fixed with the car body 1 by a positioning block and then is fixedly connected by bolts.
For the chassis, as shown in fig. 10, the chassis includes a simulated engine system 15, a simulated exhaust system, a simulated suspension, a simulated oil tank, wheels, a brake system 11 and a chassis guard plate, the wheels and a support frame 8 of the vehicle body 1 are provided with a connection plate 9 on the framework 7 corresponding to the position of the support frame 8, a plurality of first adjusting holes are arranged on the connection plate 9 along the vertical direction, the support frame 8 includes an adjusting plate, a plurality of second adjusting holes are formed on the adjusting plate corresponding to the first adjusting holes, and adjusting bolts 10 are arranged in the second adjusting holes. Fig. 11 is an enlarged partial view of the adjustable height, alternative wheel configuration of fig. 10. In addition, as shown in fig. 12, the chassis is provided with four supporting points 12 for supporting, fixing and lifting.
For the engine compartment, as shown in fig. 13, 14 and 15, the engine compartment is provided with an air inlet grille 13, a heat dissipation cooling module 14 and a simulation engine system 15, wherein the heat dissipation cooling module 14 is a real part.
In the embodiment, the standard model is provided with a sensor mounting position, and the sensor mounting position is used for mounting a sensor; the sensor mounting position includes: the sensor system comprises a front end sensor arrangement area, an engine compartment cover sensor arrangement area, a top sensor arrangement area, a tail sensor arrangement area, a middle sensor arrangement area and a bottom sensor arrangement area. In addition, the standard model is provided with a routing pipeline, and the path of the routing pipeline comprises: engine compartment to inside, top to inside, rear, outside to inside; as shown in fig. 16, the standard model is provided with a storage platform 16, the storage platform 16 is located inside the vehicle body 1, the storage platform 16 is used for installing a sensor or placing a data acquisition instrument, and the inside, the outside, the top and the rear part all refer to the inside, the outside, the top and the rear part of the standard model.
Example two
The difference from the first embodiment is that the device further comprises a pressure measuring sheet 17, a pressure scanning valve sensor, a cobra probe, an airfoil angle sensor, a temperature and humidity sensor, an acceleration sensor, a five-hole probe and a laser range finder 19. The pressure measuring sheet 17 is arranged on the upper surface of the vehicle body 1, the pressure scanning valve sensor is arranged in the vehicle body 1, and the pressure scanning valve sensor is used for measuring the pressure distribution on the surface of the vehicle body 1; the cobra probe is arranged on the upper surface of the sensor arrangement area of the engine compartment cover and used for measuring the air flow turbulence degree; the airfoil angle sensor is arranged on the upper surface of the front end sensor arrangement area and used for measuring an air flow angle; the temperature and humidity sensor is arranged in the top sensor arrangement area and used for measuring the temperature and the humidity of the airflow; the acceleration sensor is arranged on the upper surface of the arrangement area of the engine compartment cover sensor and is used for measuring the vibration change of the compartment cover; the five-hole probe is arranged on the upper surface of the sensor arrangement area of the engine compartment cover and used for measuring the size and the angle of airflow. The laser range finder 19 is arranged in the bottom sensor arrangement area close to the front wheel, and the laser range finder 19 is used for the ground clearance height change of the vehicle body 1 in the flow field.
EXAMPLE III
The difference from the first embodiment is only that the back module is of a sedan type, as shown in fig. 17, a conventional wind resistance test can be performed: and (4) fixing the standard model on the wind tunnel force-measuring balance without installing other sensors. Specifically, a 1:1 model is made for a full-scale wind tunnel test, or a scaled model is made for a scaled wind tunnel test.
Example four
The difference from the first embodiment is only that the back module is of a sedan type, as shown in fig. 18, the surface pressure measurement can be performed: the pressure measuring sheet 17, that is, the black spot in fig. 18 is arranged on the surface of the vehicle body, the pressure distribution on the surface is measured by using the pressure scanning valve sensor, and the pressure measuring point can be arranged on the surface of any vehicle body 1 as required.
EXAMPLE five
The difference with the first embodiment is that the back module is a sedan type, and can perform real incoming flow measurement: the method mainly comprises the steps of carrying out multi-physical quantity measurement on incoming flow, measuring incoming flow turbulence degree by using a cobra probe, measuring incoming flow angles by using a five-hole probe and an airfoil angle sensor, measuring incoming flow temperature and humidity by using a temperature and humidity sensor, measuring vibration change of a cabin cover by using an acceleration sensor, measuring vehicle ground clearance change in a flow field by using a laser range finder 19, and increasing or decreasing the sensors or changing the installation position according to test requirements.
EXAMPLE six
The difference from the first embodiment is only that steady state wind, gust, crosswind response measurements can be made as shown in figures 19-20: other sensors can be added to measure other physical quantities by installing a posture sensor 18 in the standard model or installing a laser range finder 19 on the chassis to measure the posture change of the standard model in the flow field.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (15)
1. An automobile aerodynamic standard model with an intelligent sensing function is characterized by comprising an automobile body, wherein the automobile body comprises: the automobile tail comprises a head part, an automobile body part and a tail part, wherein the upper half part of the tail part comprises a back module which is detachably connected with the automobile body part and the lower half part of the tail part;
the front end of the car head part is provided with a front end sensor arrangement area, an engine compartment cover of the car head part is provided with an engine compartment cover sensor arrangement area, the top of the car body part is provided with a top sensor arrangement area, the rear side of the car tail part is provided with a tail sensor arrangement area, and the inside of the car body part is provided with a middle sensor arrangement area; the bottom of the vehicle body is provided with a bottom sensor arrangement area.
2. The standard model of automotive aerodynamics with intelligent sensing as in claim 1, wherein the back module includes a sedan type, a scooter type, an SUV type and a pick-up type.
3. The standard model of automobile aerodynamics with intelligent sensing function as claimed in claim 2, wherein the volume of the back module is 1/4-1/3 of the volume of the automobile body.
4. The standard model of automotive aerodynamics with intelligent sensing function as claimed in claim 1, wherein a frame is provided in the body, and the head portion, the body portion and the tail portion are all fixedly connected with the frame.
5. The standard model of aerodynamic vehicle with intelligent perception function as claimed in claim 4, wherein, there are several locating blocks on the lower side of the back module, the locating blocks are distributed circumferentially along the edge of the lower side, and there are matching locating slots on the skeleton corresponding to the location and number of the locating blocks.
6. The standard model of vehicle aerodynamics with intelligent sensing function as claimed in claim 5, wherein the frame has a plurality of threaded holes, the back module has a plurality of connecting seats corresponding to the threaded holes, and the connecting seats have connecting holes corresponding to the threaded holes.
7. The standard model of aerodynamic vehicle with intelligent sensing function as set forth in claim 1, wherein the back module is opened with a through hole corresponding to each connecting seat, and a cover is covered on the through hole and hinged with the back module, and the outer surface of the cover is flush with the outer surface of the back module.
8. The standard model of automotive aerodynamics with intelligent sensing function according to claim 1, wherein a rearview mirror module is detachably connected to each of two sides of the body portion.
9. The standard model of vehicle aerodynamics with intelligent sensing function as claimed in claim 6, wherein a heat dissipation cooling module is installed at the front side of the frame, the heat dissipation cooling module is located in the vehicle head, an air inlet grille is installed at the front side of the vehicle head, and a simulation engine system is installed at the inner side of the vehicle head.
10. The standard model of aerodynamic vehicle with intelligent perception function as claimed in claim 9, wherein a support frame is provided on the frame corresponding to the wheel position of the vehicle body, and a braking system is installed on the support frame.
11. The standard model of claim 10, wherein the frame has a connecting plate corresponding to the position of the supporting frame, the connecting plate has a plurality of first adjusting holes arranged along the vertical direction, the supporting frame comprises an adjusting plate, the adjusting plate has a plurality of second adjusting holes corresponding to the first adjusting holes, and the second adjusting holes have adjusting bolts.
12. The standard model of aerodynamic vehicle with intelligent sensing function of claim 11, wherein the adjusting plate is fixedly connected with a supporting plate, the braking system is fixed on the end of the supporting plate, and the braking system is provided with wheels.
13. The standard model of automotive aerodynamics with intelligent sensing capability as set forth in claim 4, wherein a chassis is mounted to the bottom of the frame.
14. The standard model of automotive aerodynamics with intelligent sensing function as claimed in claim 13, wherein the chassis is provided with a simulation exhaust system, a simulation suspension, a simulation oil tank and a simulation lower guard plate.
15. The standard model of automotive aerodynamics with intelligent sensing function as claimed in claim 14, wherein a platform is disposed on the frame and is located in the body.
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| US20200333212A1 (en) * | 2018-05-08 | 2020-10-22 | Central South University | System and method for testing aerodynamic characteristic of high-speed moving vehicle-bridge system and subsidiary facilities thereof under crosswind |
| CN209248911U (en) * | 2018-09-28 | 2019-08-13 | 魏天琪 | A kind of student's removably globe |
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| CN211106820U (en) * | 2019-09-24 | 2020-07-28 | 南京航空航天大学金城学院 | Atomic vehicle design and implementation system based on ECAS air suspension system |
| CN111024434A (en) * | 2019-12-31 | 2020-04-17 | 广西科技大学 | Loader operation process comprehensive performance test platform and test method thereof |
| CN211352412U (en) * | 2020-01-10 | 2020-08-25 | 深圳市风速科技有限公司 | Bluetooth headset with storage function |
| CN213035070U (en) * | 2020-05-26 | 2021-04-23 | 天津文泽模具有限公司 | Car car light base shell mould convenient to installation |
| CN111855138A (en) * | 2020-07-21 | 2020-10-30 | 清华大学 | Automobile aerodynamic standard model, self-calibration method thereof and aerodynamic data testing method |
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