CN117589414A - Seven-belt mobile pavement simulation system for heavy truck wind tunnel test - Google Patents
Seven-belt mobile pavement simulation system for heavy truck wind tunnel test Download PDFInfo
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- CN117589414A CN117589414A CN202410076623.0A CN202410076623A CN117589414A CN 117589414 A CN117589414 A CN 117589414A CN 202410076623 A CN202410076623 A CN 202410076623A CN 117589414 A CN117589414 A CN 117589414A
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- 238000004088 simulation Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 94
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims description 78
- 238000007664 blowing Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 8
- 230000009191 jumping Effects 0.000 claims description 6
- 230000000452 restraining effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- 238000003825 pressing Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000036544 posture Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the field of wind tunnel tests, in particular to a seven-belt movable pavement simulation system for a heavy truck wind tunnel test, which comprises an upper rotating table surface for supporting a heavy truck, a balance mechanism for supporting the upper rotating table surface, a center belt mechanism arranged in the center of the upper rotating table surface, wheel belt mechanisms distributed on two sides of the center belt mechanism and used for driving six wheels, a boundary layer mechanism used for aerodynamics simulation of the boundary of the heavy truck, and a main control unit used for controlling the whole device. The center belt mechanism comprises a center belt, a suction and floating cooling unit, a frame base body, a driving roller and a driven roller, wherein the driving roller and the driven roller are respectively rotated at two ends of the frame base body, and the center belt is sleeved on the driving roller and the driven roller.
Description
Technical Field
The invention relates to the field of wind tunnel tests, in particular to a seven-belt mobile pavement simulation system for a heavy truck wind tunnel test.
Background
Ground simulation is an important problem to be solved for each wind tunnel, especially for the optimization of the vehicle chassis area. Currently, the placement of a mobile pavement system on a wind tunnel floor is a standard tool for simulating complex boundary conditions during the travel of a vehicle on a road. The moving belt of the single belt system is several times wider and several times longer than the vehicle, providing an ideal vehicle bottom airflow simulation. However, for single-band systems, a compromise in absolute accuracy of the force measurement is typically required. While single-band systems represent an almost optimal aerodynamic ground simulation, there are significant practical problems. Single-belt systems either require significant modifications to the vehicle during testing to account for the force closure between the wheels and the moving belt; or require the application of complex vertical force measurement techniques by moving the belt. The former may be achieved by removing the wheels from the chassis and running on a separate stand. This eliminates the lift of the wheel in the balance measurement, but the vehicle itself must be mounted on an upper or rear bracket that can create significant disturbance errors. The latter is the measurement of the vertical force of the tire contact point by moving the belt, but the absolute accuracy of the measurement cannot be verified in detail. However, since the variety of passenger car test vehicles is large and the vehicles are frequently changed, this requires higher absolute accuracy of force measurement. Especially for wind tunnel test of heavy truck, the biggest resistance of heavy truck from the external world is windage in driving process, if can optimize the appearance of vehicle, reduce windage, will greatly reduced vehicle oil consumption. In addition, vehicle manufacturers often are reluctant to modify the vehicle structure for wind tunnel testing. Therefore, a heavy truck mobile pavement simulation system with high measurement accuracy, high repeatability and simple operation is needed.
Disclosure of Invention
The invention aims to provide a seven-belt mobile pavement simulation system for a heavy truck wind tunnel test, which can accurately simulate the boundary conditions of a heavy truck running on a road and accurately obtain aerodynamic parameters of the vehicle.
The aim of the invention is achieved by the following technical scheme:
a seven-belt movable pavement simulation system for a heavy truck wind tunnel test comprises an upper rotating table surface for supporting a heavy truck, a balance mechanism for supporting the upper rotating table surface, a center belt mechanism arranged in the center of the upper rotating table surface, wheel belt mechanisms distributed on two sides of the center belt mechanism and used for driving six wheels, a boundary layer mechanism used for aerodynamics simulation of the boundary of the heavy truck, and a main control unit used for controlling the whole device.
The central belt mechanism comprises a central belt, a suction-floating cooling unit, a frame base body, a driving roller and a driven roller, wherein the driving roller and the driven roller are respectively rotated at two ends of the frame base body, the central belt is sleeved on the driving roller and the driven roller, the suction-floating cooling unit comprises a vacuum precompaction air bearing module, a high-pressure module, a negative pressure module, a jumping displacement sensor module and a temperature sensor module, the vacuum precompaction air bearing module comprises a plurality of vacuum precompaction air bearings, the plurality of vacuum precompaction air bearings are uniformly arranged at the upper end of the frame base body and are positioned below a working surface of the central belt, each vacuum precompaction air bearing is connected with the high-pressure module and the negative pressure module, the jumping displacement sensor module is arranged on the frame base body and used for judging the position change of the central belt, and the temperature sensor module consists of four temperature sensors and comprehensively monitors the temperature of the central belt.
The boundary layer mechanism comprises a central belt pre-suction module, a central belt tangential blowing module, a wheel belt tangential blowing module and a distributed suction module, wherein the central belt pre-suction module, the central belt tangential blowing module, the wheel belt tangential blowing module and the distributed suction module are all arranged on the upper rotating table surface.
Each wheel belt mechanism comprises a wheel belt, a driving shafting, a main driving motor, a driving side supporting bearing seat, a driving side opposite side supporting bearing seat, a wheel belt deviation rectifying hydraulic cylinder, a driven roller adjustable bearing seat, an air bearing seat, a connecting body, a wheel belt driven roller and a wheel belt driving roller, wherein the driving side supporting bearing seat and the driving side opposite side supporting bearing seat are respectively fixed at two ends of the connecting body, the wheel belt driving roller rotates between the driving side supporting bearing seat and the driving side opposite side supporting bearing seat, the two driven roller adjustable bearing seats respectively rotate at two ends of the connecting body, the wheel belt driven roller rotates between the two driven roller adjustable bearing seats, the driving side supporting bearing seat and the driving side opposite side supporting bearing seat are respectively connected with the two driven roller adjustable bearing seats in a rotating mode, the main driving motor is fixed on the driving side supporting bearing seat, the wheel belt driving roller rotates through the driving shafting, the wheel belt is sleeved on the wheel belt driving roller and the wheel belt driven roller, the two ends of the air bearing seat are respectively fixed on the driving side supporting bearing seat and the driving side opposite side supporting bearing seat, and the air bearing seat is fixed on the air bearing seat for supporting the wheel belt.
Every wheel area mechanism still includes wheel area displacement sensor that rectifies, pulls force sensor and pad seat, it fixes between drive side support bearing frame and drive side contralateral support bearing frame and pad seat to pull force sensor, and two wheel area displacement sensors that rectify are all installed and are pulled force sensor for detect the axial position of wheel area.
The balance mechanism comprises an upper balance assembly for supporting the upper rotating table surface, a plurality of force transducers uniformly fixed on the lower end surface of the upper balance assembly in the circumferential direction, and a lower balance assembly fixed below the force transducers.
The four restraint supporting mechanisms are used for supporting and restraining the skirts at the four corners of the heavy truck respectively.
The constraint support mechanism comprises a support unit; the supporting unit comprises a supporting upright post, a machine vision camera, a longitudinal displacement sensor, an electric cylinder and an electric cylinder support, wherein the electric cylinder is fixed on the electric cylinder support, the supporting upright post slides in the electric cylinder, the machine vision camera is fixed on the electric cylinder support, and the longitudinal displacement sensor is arranged on the electric cylinder.
The device also comprises a displacement adjusting mechanism which is arranged on the upper balance assembly and is used for adjusting the positions of the four constraint supporting mechanisms and the positions of the six wheel belt mechanisms.
The displacement adjusting mechanism comprises a support base, wheel displacement modules and axial displacement modules, wherein the two support bases are fixed on the upper end face of the upper balance assembly side by side, the two wheel displacement modules are respectively connected to the two support bases, each wheel displacement module is connected with five axial displacement modules, and four electric cylinder supports are respectively fixed on four axial displacement modules; six pad seats are respectively fixed on the other six axial displacement modules.
The beneficial effects of the invention are as follows:
1. the relative positions of the constraint supporting subsystem and the wheel driving subsystem are monitored in real time through the displacement adjusting subsystem and the machine vision camera, so that the supporting and fixing of the heavy truck is realized; meanwhile, parameters such as the height, the pitching angle and the like of the heavy truck are adjusted in real time by controlling the ejection height of the constraint support subsystem, so that more running postures of the heavy truck are simulated.
2. Whether the central belt or the wheel belt deviates or not can be monitored in real time by utilizing the respective deviation correcting displacement sensor, the jump quantity of the central belt or the wheel belt is monitored in real time by utilizing the displacement sensor built in the air floatation unit, the air pressure value of the air floatation bearing is controlled in real time, and a flat surface is provided for the central belt or the wheel belt.
3. The incoming flow boundary layer is further optimized by the suction module and tangential blowing module of the boundary layer subsystem.
Drawings
FIG. 1 is an overall schematic of a seven-belt mobile pavement simulation system for a heavy truck wind tunnel test;
FIGS. 2 to 4 are schematic structural views of the center belt mechanism;
FIG. 5 is a schematic diagram of a partial structure of a seven-belt mobile pavement simulation system for a heavy truck wind tunnel test;
fig. 6 to 9 are schematic structural views of the displacement adjustment mechanism;
fig. 10 to 13 are schematic structural views of the wheel belt mechanism;
fig. 14 to 17 are schematic structural views of the constraint support mechanism;
FIG. 18 is a schematic structural view of a boundary layer mechanism;
FIG. 19 is a schematic view of the floor turntable mechanism;
fig. 20 is a schematic diagram of control by the master control unit.
In the figure:
a heavy truck 1; an upper turntable surface 2; a center belt mechanism 3; wheel belt mechanism 4; a restraint support mechanism 5; a support base 6; an upper balance assembly 7; a load cell 8; a lower balance assembly 9; a lower turntable unit 10; a center belt 11; a suction-floating cooling unit 12; a frame base 13; a tension deviation rectifying unit 14; a drive roller 15; a drive roll bearing housing 16; a driven toothed pulley 17; a drive roller bearing seat adjusting block 18; toothed belt 19; a driving toothed pulley 20; a protective cover 21; a speed sensor 22; a speed sensor bracket 23; driving the servo motor 24; a decelerator 25; driven roller 26; a photoelectric switch 27; an offset sensor 28; an offset sensor holder 29; a hydraulic cylinder 30; a driven roller bearing seat 31; bearing block slide rail 32; a manipulation port 33; a clamping frame 34; an electric cylinder 35; a wheel grating 37; a wheel direction screw 38; wheel guide rails 39; wheel slide 40; a rail support plate 41; an electric cylinder and shoe support plate 42; an axial slider 43; an axial guide 44; wheel reader connection block 45; a wheel reader 46; wheel nut seat 47; an axial nut seat 48; an axial reader 49; an axial reader connection block 50; an axial lead screw 51; an axial screw seat 52; an axial motor support 53; an axial motor 54; an axial grating 55; a wheel motor 56; wheel belt 57; a drive shaft 58; a main drive motor 59; a driving side support bearing housing 60; drive side-to-side support bearing housing 61; the wheel belt deviation correcting hydraulic cylinder 62; an adjustable bearing block 63 for the driven roller; an air bearing 64; an air bearing seat 65; a pulley belt driven roller 66; the wheel belt deviation correcting displacement sensor 67; a drag force sensor 68; a pad 69; a connector 70; a deep groove ball bearing 71; tapered roller bearings 72; a pulley belt driving roller 73; a connecting screw 74; connecting a positioning pin 75; a base attachment screw 76; a base body connecting positioning pin 77; a wheel displacement sensor 78; an axial detection block 79; an axial displacement sensor 80; a wheel direction detection block 81; support posts 83; a machine vision camera 84; a longitudinal displacement sensor 85; an electric cylinder 86; an electric cylinder holder 87; a top cover 91; turntable bearing I92; an outer gear case 93; an internal gear case 94; a turntable bearing II 95; a rotary motor mount 96; a rotating motor 97; a transmission gear 98; a drive gear 99; square permanent magnet 100; a rotary magnet roller 101; an inserted permanent magnet 102; an output gear 103; a central band pre-suction module 104; a center belt tangential blower module 105; a wheel belt tangential blower module 106; a distributed suction module 107; an annular rack 108; the turntable drives a hydraulic motor 109.
Detailed Description
As shown in fig. 1-20:
a seven-belt movable pavement simulation system for a heavy truck wind tunnel test comprises an upper rotating table top 2 for supporting a heavy truck 1, a balance mechanism for supporting the upper rotating table top 2, a center belt mechanism 3 arranged at the center of the upper rotating table top 2, wheel belt mechanisms 4 distributed at two sides of the center belt mechanism 3 and used for driving six wheels, a boundary layer mechanism for aerodynamics simulation of the boundary of the heavy truck 1, and a main control unit for controlling the whole device.
Further:
the center belt mechanism 3 comprises a center belt 11, a suction-floating cooling unit 12, a frame base 13, a driving roller 15 and a driven roller 26, wherein the driving roller 15 and the driven roller 26 respectively rotate at two ends of the frame base 13, the center belt 11 is sleeved on the driving roller 15 and the driven roller 26, the suction-floating cooling unit 12 comprises a vacuum pre-pressing air bearing module, a high-pressure module, a negative-pressure module, a jumping displacement sensor module and a temperature sensor module, the vacuum pre-pressing air bearing module comprises a plurality of vacuum pre-pressing air bearings, the plurality of vacuum pre-pressing air bearings are uniformly arranged at the upper end of the frame base 13 and are positioned below the working surface of the center belt 11, each vacuum pre-pressing air bearing is connected with the high-pressure module and the negative-pressure module, the jumping displacement sensor module is arranged on the frame base 13 and used for judging the position change of the center belt 11, and the temperature sensor module comprises four temperature sensors and comprehensively monitors the temperature of the center belt 11.
The suction and floating cooling unit 12 can keep the center belt 11 flat. The upper surface of each vacuum preloading air bearing is provided with micro-nano pores with uniform density for blowing high-pressure gas. The central annular region of each vacuum preloaded air bearing serves to create a vacuum region. The high-pressure module consists of an air compressor, an air tank, a cooling dryer and an electric control pressure regulating valve, can provide low-temperature high-pressure air, and achieves the purpose of providing pulling force and cooling for the central belt 11 through a vacuum pre-pressing air bearing. The negative pressure module consists of a vacuum pump, a vacuum regulating valve and the like, and can suck the central belt 11 through a vacuum pre-pressing air bearing to provide a pull-down force for the central belt 11. The runout displacement sensor module is a non-contact laser sensor, and judges the position change of the moving belt by emitting laser and receiving reflected light. A plurality of laser displacement sensors are uniformly distributed below the working surface of the central belt 11, zero return is carried out at the initial leveling position of the central belt 11, when each position of the surface of the working surface of the central belt 11 is jumped, a three-dimensional surface topography is drawn after interpolation smoothing processing is carried out according to the displacement change of the central belt 11 measured by each laser displacement sensor, and the high pressure/negative pressure of the corresponding vacuum pre-pressing air bearing is adjusted according to the displacement change of the central belt 11, so that different supporting forces are provided for the central belt 11 in different areas, and the leveling of the central belt 11 is ensured. The temperature sensor module is composed of four temperature sensors, and can comprehensively monitor the temperature of the central belt 11. When the temperature of the central belt 11 is detected to reach a certain threshold value, the cold dryer is controlled to output high-pressure gas with lower temperature.
Each vacuum preloaded air bearing is individually controlled. When the center belt 11 is operated at a high speed and the upper surface of the center belt 11 is subjected to a load change due to the posture adjustment of the test model or the object, the fluctuation state of the upper surface of the center belt 11 in each region is monitored by a plurality of displacement sensors. When the fluctuation of the upper surface of a certain area of the central belt 11 is detected to exceed a certain threshold value, the control unit controls the vacuum regulating valve of the area to output different negative pressures so as to achieve the purpose of regulating the compression resistance and the tensile resistance of the upper surface of the central belt 11 of the area and further ensure the flatness of the upper surface of the central belt 11. When the fluctuation of the upper surface of the central belt 11 is severe, and the adjustment of the negative pressure cannot be satisfied, the control unit adjusts the electric control pressure regulating valve in the corresponding area to control the pressure value of the output gas, and then the negative pressure adjustment is matched, so that the flatness of the central belt 11 is ensured to cope with severe working conditions.
Further:
the center belt mechanism 3 further comprises a driving roller bearing seat 16, driving roller bearing seat adjusting blocks 18, a driving servo motor 24 and a speed reducer 25, the driving roller bearing seats 16 are rotatably connected to two ends of the driving roller 15, the two driving roller bearing seats 16 are fixed to the frame base 13 through bolts, the two driving roller bearing seat adjusting blocks 18 are fixed to the frame base 13, the driving servo motor 24 is fixed to the frame base 13, the driving servo motor 24 drives the driving roller 15 to rotate through the speed reducer 25, a speed sensor support 23 is fixed to the end, close to the driving roller 15, of the frame base 13, and a speed sensor 22 is fixed to the speed sensor support 23 and used for monitoring the speed of the center belt 11 in real time.
Wherein, one end of the driving roller 15 is fixed with a driven toothed belt wheel 17, the output shaft of the speed reducer 25 is fixed with a driving toothed belt wheel 20, the driven toothed belt wheel 17 and the driving toothed belt wheel 20 are connected in a transmission way through a toothed belt 19, and a protective cover 21 is fixed on the frame base 13 to cover and protect the transmission parts;
when the position of the drive roller bearing seat 16 is finely adjusted through the drive roller bearing seat adjusting block 18, the bolt which is arranged on the side surface of the drive roller bearing seat adjusting block 18 in a threaded manner is rotated to jack the drive roller bearing seat 16, so that fine adjustment on the position of the drive roller bearing seat 16 is formed.
Further:
the center belt mechanism 3 further comprises two tensioning deviation rectifying units 14 which are respectively arranged at two ends of the driven roller 26 and are used for controlling the tensioning degree of the center belt 11 and rectifying the center belt 11, each tensioning deviation rectifying unit 14 comprises a photoelectric switch 27, a deviation sensor 28, a deviation sensor support 29, a hydraulic cylinder 30, a driven roller bearing seat 31 and a bearing seat sliding guide rail 32, the driven roller bearing seat 31 rotates at the end of the driven roller 26, the driven roller bearing seat 31 slides on the bearing seat sliding guide rail 32, the bearing seat sliding guide rail 32 is fixed on the frame base 13, the hydraulic cylinder 30 is fixed between the driven roller bearing seat 31 and the frame base 13, the deviation sensor support 29 is arranged on the driven roller bearing seat 31, the deviation sensor 28 is arranged on the deviation sensor support 29, and the photoelectric switch 27 is arranged on the frame base 13.
When the offset of the center belt 11 is monitored by the offset sensor 28, the corresponding side hydraulic cylinder 30 is ejected out, so that the corresponding driven roller bearing seat 31 slides on the bearing seat sliding guide rail 32, the tensioning degree of the side center belt 11 is higher, and the purpose of correcting deviation is achieved. The speed of the central belt 11 is monitored in real time through the speed sensor 22, when the slipping and stall of the central belt 11 are found, the hydraulic cylinders 30 on the two sides are ejected simultaneously, and the central belt 11 is tensioned to match the speed of the central belt 11;
when the deviation correcting operation cannot block the deviation of the center belt 11 to trigger the photoelectric switch 27, the control unit controls the device to stop running.
As shown in fig. 1-20:
the boundary layer mechanism comprises a central belt pre-suction module 104, a central belt tangential blowing module 105, a wheel belt tangential blowing module 106 and a distributed suction module 107, wherein the central belt pre-suction module 104, the central belt tangential blowing module 105, the wheel belt tangential blowing module 106 and the distributed suction module 107 are all arranged on the upper rotating table top 2.
Wherein the central belt pre-suction module 104 and the distributed suction module 107 consist of a perforated plate arranged on the upper turntable surface 2 and a suction fan arranged below the upper turntable surface 2. The tangential air blowing module 105 of the center belt and the tangential air blowing module 106 of the wheel belt are realized by drainage channels through connecting induced air holes. Thereby further optimizing the boundary layer near the vehicle and enabling the aerodynamic simulation of the vehicle to be more accurate.
As shown in fig. 1-20:
each wheel belt mechanism 4 comprises a wheel belt 57, a driving shaft 58, a main driving motor 59, a driving side supporting bearing seat 60, a driving side opposite side supporting bearing seat 61, a wheel belt deviation correcting hydraulic cylinder 62, a driven roller adjustable bearing seat 63, an air bearing 64, an air bearing seat 65, a connecting body 70, a wheel belt driven roller 66 and a wheel belt driving roller 73, wherein the driving side supporting bearing seat 60 and the driving side opposite side supporting bearing seat 61 are respectively fixed at two ends of the connecting body 70, the wheel belt driving roller 73 is rotated between the driving side supporting bearing seat 60 and the driving side opposite side supporting bearing seat 61, the two driven roller adjustable bearing seats 63 are respectively rotated at two ends of the connecting body 70, the wheel belt driven roller 66 is rotated between the two adjustable bearing seats 63, the driving side supporting bearing seat 60 and the driving side opposite side supporting bearing seat 61 are respectively rotated with the wheel belt deviation correcting hydraulic cylinder 62, the two wheel belt deviation correcting hydraulic cylinders 62 are respectively connected with the two adjustable bearing seats 63 in a rotating manner, the main driving motor 59 is fixed on the driving side supporting bearing seat 60, the wheel belt driving roller 73 is respectively rotated through the driving shaft 58, the wheel belt driving roller 57 is sleeved on the wheel belt driving roller 73, the wheel belt driving roller 73 is respectively fixed at the two ends of the driven roller bearing seat 65, and the driven roller 65 is respectively fixed on the driven side opposite side supporting bearing seat 60, and the air bearing seat 65 is used for supporting the air bearing seat to the air bearing seat 65.
Wherein, the driven roller adjustable bearing seat 63 is internally provided with a deep groove ball bearing 71 and a tapered roller bearing 72 which are arranged side by side and are used for being installed with the axle head of the driven roller 66 of the wheel belt;
when driving wheels, the main driving motor 59 is started to drive the wheel belt driving roller 73 to rotate, and then the wheel belt 57 is driven to rotate, so that the wheels are driven to rotate through friction force, and the distance between the two driven roller adjustable bearing seats 63 and the central line of the wheel belt driving roller 73 is respectively adjusted through the expansion and contraction of the two wheel belt deviation correcting hydraulic cylinders 62, so that the tension of the wheel belt 57 is adjusted at the two ends of the wheel belt driven roller 66, the purpose of correcting the wheel belt 57 is achieved, and the driving of the wheels is guaranteed, wherein in general, the two wheel belt deviation correcting hydraulic cylinders 62 are simultaneously adjusted to be in tension adjustment, and the two wheel belt deviation correcting hydraulic cylinders 62 are respectively adjusted to be in deviation correcting adjustment;
in addition, by increasing the extension of the two-sided wheel belt correction cylinders 62, the wheel drive can be tilted to simulate the aerodynamic characteristics of the wheel during climbing or downhill.
Support for the wheel belt 57 is provided by customized air bearings 64 to keep the wheel belt 57 flat.
As shown in fig. 1-20:
each wheel belt mechanism 4 further comprises a wheel belt deviation correcting displacement sensor 67, a dragging force sensor 68 and a pad 69, wherein the dragging force sensor 68 is fixed between the driving side supporting bearing seat 60 and the driving side opposite side supporting bearing seat 61 and the pad 69, and the two wheel belt deviation correcting displacement sensors 67 are arranged on the dragging force sensor 68 and are used for detecting the axial position of the wheel belt 57.
The three-way force of the wheel in the wind tunnel simulation test can be measured through the drag force sensor 68;
wherein the connecting body 70 is fixedly connected with the driving side supporting bearing seat 60 and the driving side opposite side supporting bearing seat 61 through a connecting screw 74 and a connecting positioning pin 75; the drive side support bearing housing 60 and the drive side opposite side support bearing housing 61 are fixedly connected to the drag force sensor 68 by a base connection screw 76 and a base connection dowel pin 77.
The deviation correction can be monitored in real time through the wheel belt deviation correction displacement sensor 67: when the wheel belt 57 shields the monitoring point of the wheel belt deviation correcting displacement sensor 67 on one side, namely, the wheel belt 57 is deviated under high-speed rotation, the wheel belt 57 is separated from the roller, and the wheel belt deviation correcting hydraulic cylinder 62 on the side is ejected out a certain distance, so that the wheel belt driven roller 66 is inclined, and the wheel belt 57 is corrected to the original position. Ensuring that the pulley belt 57 runs stably between the two rollers.
As shown in fig. 1-20:
the balance mechanism comprises an upper balance assembly 7 for supporting the upper turntable surface 2, a plurality of load cells 8 uniformly fixed on the lower end surface of the upper balance assembly 7 in the circumferential direction, and a lower balance assembly 9 fixed below the plurality of load cells 8.
The plurality of load cells 8 are used for measuring the six-directional force and moment of the wind tunnel incoming flow received by the heavy truck 1.
As shown in fig. 1-20:
and the four restraint supporting mechanisms 5 are used for supporting and restraining the skirts at the four corners of the heavy truck 1 respectively.
The restraint support mechanism 5 includes a support unit; the supporting unit comprises a supporting upright post 83, a machine vision camera 84, a longitudinal displacement sensor 85, an electric cylinder 86 and an electric cylinder support 87, wherein the electric cylinder 86 is fixed on the electric cylinder support 87, the supporting upright post 83 slides in the electric cylinder 86, the machine vision camera 84 is fixed on the electric cylinder support 87, and the longitudinal displacement sensor 85 is installed on the electric cylinder 86.
The constraint supporting mechanism 5 further comprises a locking unit, wherein the locking unit comprises a top cover 91, a turntable bearing I92, an outer gear shell 93, an inner gear shell 94, a turntable bearing II 95, a rotary motor seat 96, a rotary motor 97, a transmission gear 98, a driving gear 99, a square permanent magnet 100, a rotary magnet roller 101, an inserted permanent magnet 102 and an output gear 103; the rotary motor seat 96 is fixed on the upper end of the support upright 83, the lower end of the inner tooth shell 94 is rotationally connected to the upper end of the rotary motor seat 96 through a turntable bearing II 95, the outer tooth shell 93 is connected in the inner tooth shell 94 in a matched mode, the lower end of the outer tooth shell 93 is provided with a transmission gear 98, the transmission gear 99 is rotationally arranged in the rotary motor seat 96 and is in meshed transmission with the transmission gear 98, the rotary motor 97 is fixed at the side end of the rotary motor seat 96 and is used for driving the transmission gear 99, the top cover 91 is rotationally arranged at the upper end of the outer tooth shell 93 through a turntable bearing I92, square permanent magnets 100 are arranged at the upper end of an inner hole of the top cover 91, a rotary magnet roller 101 is transversely rotated in the inner hole of the top cover 91, an inserted permanent magnet 102 is arranged in the rotary magnet roller 101, and an output gear 103 is arranged at one end of the rotary magnet roller 101 and is in transmission connection with the upper end of the outer tooth shell 93.
During locking, the supporting upright post 83 is controlled to eject through the action of the electric cylinder 86, then the supporting upright post 83 moves upwards against the locking mechanism, after the top cover 91 is close to the automobile skirt, the outer gear shell 93 is driven to rotate through the driving gear 99 and the transmission gear 98 by starting the rotating motor 97, and then the rotating magnet roller 101 is driven to rotate 180 degrees through the output gear 103, so that the inserted permanent magnet 102 in the rotating magnet roller 101 and the square permanent magnet 100 above form a magnetic chuck, and the automobile skirt is fixed, and the aim of fixing the heavy truck 1 is fulfilled. The locking unit is used for adapting to the bottom skirt rims of different automobiles.
The supporting unit provides longitudinal displacement for the locking unit, so that the purpose of supporting the automobile is achieved. In addition, the adjustment of the heights, the pitching angles and other multi-postures of the automobile chassis can be realized by adjusting different heights of the 4 sets of supporting units. The height is monitored by a longitudinal displacement sensor 85 and the relative position of the top cover 91 of the locking unit to the car skirt is obtained by a machine vision camera 84.
As shown in fig. 1-20:
the device also comprises a displacement adjusting mechanism which is arranged on the upper balance assembly 7 and is used for adjusting the positions of the four constraint supporting mechanisms 5 and the positions of the six wheel belt mechanisms 4.
The displacement adjusting mechanism comprises a support base 6, wheel displacement modules and axial displacement modules, wherein the two support bases 6 are fixed on the upper end face of the upper balance assembly 7 side by side, the two wheel displacement modules are respectively connected to the two support bases 6, each wheel displacement module is connected with five axial displacement modules, and four electric cylinder supports 87 are respectively fixed on four of the axial displacement modules; six pads 69 are secured to the other six axial displacement modules, respectively.
Each wheel direction displacement module comprises a wheel direction grating 37, a wheel direction lead screw 38, a wheel direction guide rail 39, a wheel direction sliding block 40, a guide rail supporting plate 41, a wheel direction reader connecting block 45, a wheel direction reader 46, a wheel direction nut seat 47 and a wheel direction motor 56; the two steering guide rails 39 are fixed at the upper end of the support base 6 in parallel, the five guide rail support plates 41 slide on the two steering guide rails 39 through the steering slide blocks 40, the steering screw rods 38 are fixed on the support base 6 and are parallel to the two steering guide rails 39, the five steering nut seats 47 are respectively fixed at the lower ends of the five guide rail support plates 41, the five steering motors 56 are respectively fixed on the five guide rail support plates 41 and respectively drive screw sleeves in the five steering nut seats 47, and the screw sleeves are in threaded connection with the corresponding steering screw rods 38; the wheel direction grating 37 is fixed on the support base 6 and parallel to the wheel direction rail 39, five wheel direction reader connecting blocks 45 are respectively fixed on the lower end surfaces of the five rail support plates 41, five wheel direction readers 46 are fixed on the five wheel direction reader connecting blocks 45, and the five wheel direction readers 46 correspond to the wheel direction grating 37.
The wheel direction motor 56 drives the wheel direction motor to rotate the thread bush in the nut seat 47, so that the thread bush is in threaded transmission with the wheel direction screw rod 38, the thread bush can drive the guide rail support plate 41 to move through the wheel direction nut seat 47, the guide rail support plate 41 slides on the wheel direction guide rail 39 through the wheel direction sliding block 40, and then the constraint support mechanism 5 or the wheel belt mechanism 4 is formed to carry out wheel direction displacement. By matching the steering grating 37 with the corresponding two steering readers 46, the positions of the four restraint supporting mechanisms 5 and the six wheel belt mechanisms 4 corresponding to the steering grating 37 can be accurately determined.
Further:
each axial displacement module comprises an electric cylinder and pad support plate 42, an axial sliding block 43, an axial guide rail 44, an axial nut seat 48, an axial reader 49, an axial reader connecting block 50, an axial lead screw 51, an axial lead screw seat 52, an axial motor support 53, an axial motor 54 and an axial grating 55; the two axial guide rails 44 are fixed on the guide rail supporting plate 41, the two axial screw bases 52 are fixed on the guide rail supporting plate 41, two ends of the axial screw 51 are rotated on the two axial screw bases 52, the axial motor 54 is fixed on the guide rail supporting plate 41 through the axial motor support 53, the axial motor 54 drives the axial screw 51, the electric cylinder and the pad supporting plate 42 slide on the two axial guide rails 44 through the axial sliding blocks 43, the axial nut base 48 is fixed at the lower ends of the electric cylinder and the pad supporting plate 42, and the axial nut base 48 is in threaded connection with the axial screw 51. An axial grating 55 is fixed on the guide rail support plate 41 in parallel with the two axial guide rails 44, an axial reader connection block 50 is fixed at the lower end of the electric cylinder and pad support plate 42, an axial reader 49 is fixed on the axial reader connection block 50, and the axial reader 49 corresponds to the axial grating 55.
The axial motor 54 drives the axial screw rod 51, and then the axial nut seat 48 is driven by the screw thread to drive the electric cylinder and the cushion support plate 42 to move, so that the electric cylinder and the cushion support plate 42 slide on the axial guide rail 44 through the axial sliding block 43, and then the electric cylinder and the cushion support plate 42 are formed to drive the constraint support mechanism 5 to axially displace. By matching the axial grating 55 with the axial reader 49, the axial position of the restraining support mechanism 5 or the wheel belt mechanism 4 can be accurately determined.
The displacement adjustment mechanism further comprises a wheel direction displacement sensor 78, an axial direction detection block 79, an axial direction displacement sensor 80 and a wheel direction detection block 81, wherein the wheel direction detection block 81 and the wheel direction displacement sensor 78 are respectively arranged on the same wheel direction electric cylinder and the backing support plate 42, and the axial direction detection block 79 and the axial direction displacement sensor 80 are respectively arranged on the same axial direction electric cylinder and the backing support plate 42;
namely, the relative positions of the two restraining support mechanisms 5 or the three wheel belt mechanisms 4 in the same wheel direction can be detected by the cooperation of the wheel direction detection block 81 and the wheel direction displacement sensor 78 in the same wheel direction, and the relative positions of the two pairs of restraining support mechanisms 5 or the three pairs of wheel belt mechanisms 4 in the same axial direction can be detected by the cooperation of the axial direction detection block 79 and the axial direction displacement sensor 80 in the same axial direction; so as to adapt to the wheelbase, wheel tread and skirt edge distances of different automobiles.
As shown in fig. 1-20:
the auxiliary belt replacing unit for replacing the central belt 11 comprises a control opening 33, a clamping frame 34 and electric cylinders 35, wherein a plurality of control openings 33 are formed in the lateral direction of the frame base 13 in a penetrating mode, the clamping frame 34 can be inserted into the plurality of control openings 33, the electric cylinders 35 are arranged at four corners of the frame base 13, and the four electric cylinders 35 are fixed on the upper balance assembly 7.
Wherein, the clamping frame 34 has one end opened and is equivalent to a structure similar to a forklift, and the step of replacing the belt is as follows:
the central belt mechanism 3 is ejected out through the electric cylinder 35 until the control opening 33 is higher than the upper turntable surface 2;
inserting a clamping frame 34 into the control opening 33, and carrying out hoisting suspension by matching with hoisting equipment;
the hydraulic cylinder 30 of the center belt mechanism 3 is retracted to the shortest so that the center belt 11 is thoroughly loosened;
tape change is performed from the open end of the holder 34;
tensioning the new belt.
As shown in fig. 1-20:
the device also comprises a floor turntable mechanism, and the main function of the floor turntable mechanism is to adjust the included angle between the test vehicle and the incoming flow of the wind tunnel so as to simulate the aerodynamic load of the test vehicle in a yaw attitude. The floor turntable mechanism includes an upper turntable unit, a lower turntable unit 10, and a turntable driving unit.
The upper turntable unit comprises an upper turntable surface 2, an upper turntable track, a plurality of upper turntable sliding blocks and an upper turntable support. Wherein the upper turntable support is mounted on the ground, and the upper turntable track is mounted on the upper turntable support. A plurality of upper turntable sliders are mounted on the upper turntable surface 2 and cooperate with the upper turntable track. Furthermore, the upper turntable surface 2 is connected to the upper balance assembly 7 via a connecting plate.
The lower turntable unit 10 includes a lower turntable base, a lower turntable track, a plurality of upper turntable sliders, and a lower turntable connection. Wherein the lower turntable base is mounted on the ground and the lower turntable track is mounted on the lower turntable base. A plurality of lower turntable sliders are mounted on the lower turntable connector and cooperate with the lower turntable track. In addition, the lower turntable connection is connected to the balance mechanism by means of bolts.
The turntable driving unit includes an annular rack 108, a turntable driving gear, and a turntable driving hydraulic motor 109. The annular rack 108 is mounted on the lower turntable connection, the turntable drive gear cooperates with a turntable drive hydraulic motor 109, the turntable drive hydraulic motor 109 being fixed to the ground.
The control unit collects the required signals and transmits the execution signals to each execution component after automatic processing. Meanwhile, through a man-machine interaction interface, an operator can monitor and actively control the operation of the device.
Further:
the control unit mainly comprises 6 parts, namely: the system comprises a state detection system, a driving control system, a tensioning deviation correction control system, an air floatation control system, a cooling control system and a boundary layer control system. The state detection system is used for collecting the required signals, and the execution signals are transmitted to all subsystems after the signals are automatically processed by the main control unit. Meanwhile, through a man-machine interaction interface, an operator can monitor and actively control the operation of the seven-belt mobile pavement system.
The working principle of the device is as follows:
when the automobile carries out the moving road surface simulation in the wind tunnel, the relative positions of 4 sets of constraint supporting mechanisms 5 are monitored in real time through a displacement adjusting mechanism and a machine vision camera 84 based on input test automobile data such as wheel base, wheel base and skirt edge distance, the positions of each set of constraint supporting mechanisms 5 in a plane are adjusted through an axial motor 54 and a wheel motor 56, the displacement distance is determined and fed back through a grating, and finally the position is adjusted to correspond to the automobile data. After the 4 sets of constraint supporting mechanisms 5 are aligned with the automobile skirt, the control electric cylinders 86 drive the supporting upright posts 83 to extend, and the ejection height of the top cover 91 above the supporting upright posts 83 is monitored in real time by utilizing the longitudinal displacement sensors 85. When the top cover 91 is abutted against the automobile skirt, the automobile body is fixed by the locking unit. The locking realization method comprises the following steps: the internal gear housing 94 is driven to rotate by a signal of the rotating motor 97, and the rotating magnet roller 101 is driven to rotate 180 degrees, so that a magnetic chuck is formed with the square permanent magnet 100 above, and the skirt edge of the automobile is fixed. In addition, parameters such as the height, the pitching angle and the like of the automobile are adjusted in real time by controlling the ejection height of the 4 sets of constraint supporting mechanisms 5, so that more automobile driving postures are simulated, and the supporting device and the automobile are in a locking state in the process.
When the wheel drive mechanism is aligned with the vehicle wheels, the drive servo motor 24 and the main drive motor 59 are controlled to drive the center belt 11 and the wheel belt 57 to rotate. In this process, the deviation correcting displacement sensors are used to monitor whether the center belt 11 and the wheel belt 57 deviate in real time. When the center belt 11 and the wheel belt 57 are offset, the ejection of the corresponding side hydraulic cylinders is controlled, so that the real-time deviation correction of the center belt 11 and the wheel belt 57 is realized. The speed sensor 22 is used for monitoring whether the center belt 11 and the wheel belt 57 stall in real time, and when the center belt 11 stalls, the hydraulic cylinders 30 on both sides are controlled to eject simultaneously. The same distance is ejected on both sides simultaneously, allowing the follower roller 26 to translate away from the driving roller 15, thereby tensioning the center strap 11. And stops at the time of speed matching, when the speed detected by the speed sensor 22 is the same as the rotation speed of the driving servo motor 24, it is proved that the friction provided by the current tightening degree of the center belt 11 is sufficient, and the center belt 11 does not slip, thus indicating that the tightening requirement is reached, thereby stopping the ejection of the double-sided hydraulic cylinder 30. And the jump displacement sensor built in the suction and floating cooling unit 12 is utilized to monitor the jump quantity of the central belt 11 in real time, and the air pressure value of the vacuum pre-pressing air bearing is controlled in real time, so that a flat surface is provided for the central belt 11.
When the center belt 11 needs to be replaced, the center belt mechanism 3 is first ejected by the electric cylinder 35, then inserted into the control port 33 by the holder 34, and lifted, and then the belt is replaced. The clamping frame 34 is open at one end so that replacement of the central band 11 can be performed.
In addition, the incoming flow boundary layer is further optimized by the suction module and tangential blowing module of the boundary layer mechanism. The aerodynamic parameters of the vehicle are obtained by means of a balance mechanism.
Claims (4)
1. A seven band mobile road surface analog system for heavy truck car wind tunnel test which characterized in that: the device comprises an upper turntable surface (2) for bearing a truck (1), a balance mechanism for supporting the upper turntable surface (2), a center belt mechanism (3) arranged in the center of the upper turntable surface (2), wheel belt mechanisms (4) distributed on two sides of the center belt mechanism (3) and used for driving six wheels, a boundary layer mechanism used for aerodynamically simulating the boundary of the truck (1), and a main control unit used for controlling the whole device;
the center belt mechanism (3) comprises a center belt (11), a suction-floating cooling unit (12), a frame base body (13), a driving roller (15) and a driven roller (26), wherein the driving roller (15) and the driven roller (26) are respectively rotated at two ends of the frame base body (13), the center belt (11) is sleeved on the driving roller (15) and the driven roller (26), the suction-floating cooling unit (12) comprises a vacuum precompaction air bearing module, a high-pressure module, a negative pressure module, a jumping displacement sensor module and a temperature sensor module, the vacuum precompaction air bearing module comprises a plurality of vacuum precompaction air bearings, the vacuum precompaction air bearings are uniformly arranged at the upper end of the frame base body (13) and are positioned below the working surface of the center belt (11), each vacuum precompaction air bearing is connected with the high-pressure module and the negative pressure module, the jumping displacement sensor module is arranged on the frame base body (13) and is used for judging the position change of the center belt (11), and the temperature sensor module is composed of four temperature sensors and comprehensively monitors the temperature of the center belt (11);
the boundary layer mechanism comprises a central belt pre-suction module (104), a central belt tangential blowing module (105), a wheel belt tangential blowing module (106) and a distributed suction module (107), wherein the central belt pre-suction module (104), the central belt tangential blowing module (105), the wheel belt tangential blowing module (106) and the distributed suction module (107) are all arranged on the upper rotating table top (2);
each wheel belt mechanism (4) comprises a wheel belt (57), a driving shaft system (58), a main driving motor (59), a driving side supporting bearing seat (60), a driving side opposite side supporting bearing seat (61), a wheel belt deviation correcting hydraulic cylinder (62), a driven roller adjustable bearing seat (63), an air bearing (64), an air bearing seat (65), a connecting body (70), a wheel belt driven roller (66) and a wheel belt driving roller (73), wherein the driving side supporting bearing seat (60) and the driving side opposite side supporting bearing seat (61) are respectively fixed at two ends of the connecting body (70), the wheel belt driving roller (73) rotates between the driving side supporting bearing seat (60) and the driving side opposite side supporting bearing seat (61), the two driven roller adjustable bearing seats (63) respectively rotate at two ends of the connecting body (70), the wheel belt driven roller (66) rotates between the two driven roller adjustable bearing seats (63), the wheel belt deviation correcting hydraulic cylinder (62) is respectively connected with the two adjustable motor driven roller bearing seats (60) at two ends, the driving side supporting shaft system (59) rotates on the driving side supporting shaft system (59), the wheel belt (57) is sleeved on the wheel belt driving roller (73) and the wheel belt driven roller (66), two ends of the air bearing seat (65) are respectively fixed on the driving side supporting bearing seat (60) and the driving side opposite side supporting bearing seat (61), and the air bearing (64) is fixed on the air bearing seat (65) and used for supporting the wheel belt (57);
the balance mechanism comprises an upper balance assembly (7) for supporting the upper rotary table surface (2), a plurality of load cells (8) which are uniformly fixed on the lower end surface of the upper balance assembly (7) in the circumferential direction, and a lower balance assembly (9) which is fixed below the plurality of load cells (8).
2. The seven-belt mobile pavement simulation system for the heavy truck wind tunnel test of claim 1, wherein the seven-belt mobile pavement simulation system is characterized in that: each wheel belt mechanism (4) further comprises a wheel belt deviation correcting displacement sensor (67), a dragging force sensor (68) and a cushion seat (69), wherein the dragging force sensor (68) is fixed between the driving side supporting bearing seat (60) and the driving side opposite side supporting bearing seat (61) and the cushion seat (69), and the two wheel belt deviation correcting displacement sensors (67) are arranged on the dragging force sensor (68) and used for detecting the axial position of the wheel belt (57).
3. The seven-belt mobile pavement simulation system for the heavy truck wind tunnel test of claim 1, wherein the seven-belt mobile pavement simulation system is characterized in that: the four restraint supporting mechanisms (5) are used for supporting and restraining the skirts at the four corners of the heavy truck (1) respectively;
the constraint and support mechanism (5) comprises a support unit; the supporting unit comprises a supporting upright post (83), a machine vision camera (84), a longitudinal displacement sensor (85), an electric cylinder (86) and an electric cylinder support (87), wherein the electric cylinder (86) is fixed on the electric cylinder support (87), the supporting upright post (83) slides in the electric cylinder (86), the machine vision camera (84) is fixed on the electric cylinder support (87), and the longitudinal displacement sensor (85) is installed on the electric cylinder (86).
4. A seven-belt mobile pavement simulation system for a heavy truck wind tunnel test according to claim 3, characterized in that: the device also comprises a displacement adjusting mechanism which is arranged on the upper balance assembly (7) and is used for adjusting the positions of the four constraint supporting mechanisms (5) and the positions of the six wheel belt mechanisms (4);
the displacement adjusting mechanism comprises a support base (6), wheel displacement modules and axial displacement modules, wherein the two support bases (6) are fixed on the upper end face of the upper balance assembly (7) side by side, the two wheel displacement modules are respectively connected to the two support bases (6), each wheel displacement module is connected with five axial displacement modules, and four electric cylinder supports (87) are respectively fixed on the four axial displacement modules; six pad seats (69) are respectively fixed on the other six axial displacement modules.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410076623.0A CN117589414A (en) | 2024-01-19 | 2024-01-19 | Seven-belt mobile pavement simulation system for heavy truck wind tunnel test |
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| CN202410076623.0A CN117589414A (en) | 2024-01-19 | 2024-01-19 | Seven-belt mobile pavement simulation system for heavy truck wind tunnel test |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102008036315A1 (en) * | 2008-07-11 | 2010-01-14 | Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart (FKFS) | Test stand for aerodynamic measurements in vehicles or racing cars, has treadmill component pair which comprises two treadmill components arranged at both sides of center treadmill at measuring platform or connected in detachable manner |
| CN108318210A (en) * | 2018-02-08 | 2018-07-24 | 中国汽车工程研究院股份有限公司 | Wheel driving unit and mobile road simulation system |
| CN110296808A (en) * | 2019-08-08 | 2019-10-01 | 吉林大学 | It is a kind of to rotate wind-tunnel test platform and its control method than two car model wheels |
| CN115638950A (en) * | 2022-10-26 | 2023-01-24 | 哈尔滨工业大学 | Control system for wind tunnel moving belt floor equipment |
-
2024
- 2024-01-19 CN CN202410076623.0A patent/CN117589414A/en active Pending
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|---|---|---|---|---|
| DE102008036315A1 (en) * | 2008-07-11 | 2010-01-14 | Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart (FKFS) | Test stand for aerodynamic measurements in vehicles or racing cars, has treadmill component pair which comprises two treadmill components arranged at both sides of center treadmill at measuring platform or connected in detachable manner |
| CN108318210A (en) * | 2018-02-08 | 2018-07-24 | 中国汽车工程研究院股份有限公司 | Wheel driving unit and mobile road simulation system |
| CN110296808A (en) * | 2019-08-08 | 2019-10-01 | 吉林大学 | It is a kind of to rotate wind-tunnel test platform and its control method than two car model wheels |
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