CN115165404A - Suspension dynamic test system - Google Patents
Suspension dynamic test system Download PDFInfo
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- CN115165404A CN115165404A CN202210578544.0A CN202210578544A CN115165404A CN 115165404 A CN115165404 A CN 115165404A CN 202210578544 A CN202210578544 A CN 202210578544A CN 115165404 A CN115165404 A CN 115165404A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/04—Suspension or damping
Abstract
The invention relates to a suspension dynamic test system which comprises a vehicle dynamic test bed. The vehicle dynamic test bed comprises at least one road surface excitation simulation bed, and the road surface excitation simulation bed at least comprises an electric execution unit, a supporting platform, an elastic supporting unit and a supporting frame. The support frame is built and to hold electric actuator unit's at least one space frame, conduct install with the mode of invering on the lower face of the top plate body that space frame's axial up end formed electric actuator unit makes electric actuator unit can extend downwards along its axial, makes to be connected electric actuator unit's axial lower extreme supporting platform can follow electric actuator unit's flexible undulatory motion that carries on. In addition, the invention also relates to a suspension dynamic testing device.
Description
Technical Field
The invention relates to the technical field of vehicle dynamic test beds, in particular to a suspension dynamic test system.
Background
At present, a vehicle dynamic test bed is often used in the automobile field to evaluate the dynamic performance of a vehicle body and a suspension. A four-channel vehicle dynamics test stand is commonly used for vehicle dynamics test stands. The hydraulic actuator of the vehicle dynamic test bed supports wheels through a wheel bearing device, and the vehicle dynamic test bed meets vehicles of different sizes through adjusting the placing position of the hydraulic actuator. The vehicle dynamic test bed simulates the input of a road surface through a hydraulic actuator, so that the dynamic performance of a vehicle body and a suspension can be effectively researched.
However, the fluid medium of the hydraulic actuator of the vehicle dynamic test bed has large resistance when flowing, and is easy to leak a large amount of fluid medium, so that the working efficiency of the hydraulic actuator is low; leakage of the fluid medium can not only contaminate the field, but can also cause fire and explosion hazards if not handled properly during the application. Since the performance of the hydraulic actuator is susceptible to temperature variations, the hydraulic actuator is not suitable for operating at too high or too low a temperature. The requirement on the manufacturing precision of the internal elements of the hydraulic actuator is high, so that the use cost of the hydraulic actuator is high, and the practicability is low. Furthermore, hydraulic actuators do not have a strict transmission ratio due to leakage of fluid medium and changes in compressibility; meanwhile, when the hydraulic actuator has transmission faults, reasons are not easy to find out, and the technical level requirements of operations such as use, maintenance and nursing of a user are high, so that the use environment of the hydraulic actuator is poor and the cost is high. Generally, the plane of a platform of the vehicle dynamic test bed for bearing wheels is far higher than the ground, so that a whole vehicle rack to be tested can be placed on the vehicle dynamic test bed through a large amount of manpower or machines, and certain danger exists in the process. Generally, in order to meet the requirement of the test, a user needs to select a hydraulic cylinder with larger power, which also causes the cost of the vehicle dynamic test bed to be greatly increased.
Patent document CN113465949A discloses a test system for a suspension system of an automobile. The testing system comprises a plurality of adjustable shock absorbers, a plurality of air springs, a control device and a plurality of sensors; a plurality of adjustable shock absorbers for connection with the suspension to be developed; a plurality of air springs are used for connecting with the suspension to be developed; the control device is electrically connected with the plurality of adjustable shock absorbers and is used for providing current for the plurality of adjustable shock absorbers so as to control the damping coefficient of the adjustable shock absorbers; the control device is also electrically connected with the plurality of air springs and is used for controlling the air charging and discharging states of the plurality of air springs so as to adjust the support rigidity and the support length of the air springs; the plurality of sensors are used for being connected with the suspension to be developed, so that the acceleration and the speed of the suspension to be developed in the vibration direction can be detected in real time.
The patent document with publication number CN103913315A discloses a suspension system performance testing apparatus, which includes a KC test bed connected with a wheel, a support frame arranged on the KC test bed; a connecting rod mounting bracket for fixing the connecting rod and a shock absorber mounting bracket for fixing the shock absorber are arranged on the supporting frame; the test and optimization of the performance of the suspension system in the early stage of vehicle development can be realized, so that the performance of the suspension system is improved, and the development cost is reduced. But the device does not optimize the connecting structure between the supporting platform and the supporting frame of the testing device, and the defects that the initial supporting height of the suspension is too high and the like still exist.
Therefore, in view of the defects in the prior art, a suspension dynamic test system capable of avoiding using a hydraulic actuator as a support height adjusting mechanism is needed, and particularly, a suspension dynamic test system capable of further improving the test environment of a vehicle dynamic test bed and reducing the risk factor of the test process is needed.
Furthermore, on the one hand, due to the differences in understanding to those skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
In view of the defects in the prior art, the technical scheme of the invention provides a suspension dynamic test system, which comprises a vehicle dynamic test bed for testing the dynamic performance of a vehicle body and a suspension, wherein the vehicle dynamic test bed is provided with at least one road excitation simulation platform in a manner of corresponding to the number of wheels to be supported of a vehicle, and the suspension dynamic test system is characterized in that the road excitation simulation platform at least comprises an electric execution unit, a support platform, an elastic support unit and a support frame, wherein the support frame is provided with at least one three-dimensional frame capable of accommodating the electric execution unit, and the electric execution unit is arranged on a lower plate surface of a top plate body formed on the upper axial end surface of the three-dimensional frame in an inverted manner, so that the electric execution unit can perform telescopic motion along the axial direction of the electric execution unit in a manner of changing the support height of the support platform; the lower end surface of the supporting platform is further connected with an elastic supporting unit which is supported on a bottom plate body of the supporting frame, and the electric execution unit can work in cooperation with the elastic supporting unit, so that the supporting platform can move up and down along with the expansion of the electric execution unit. The road surface simulation platform has the advantages that the structure of the road surface simulation platform is improved, compared with the existing driving module (hydraulic actuator) of the road surface simulation platform, the combined structure of the electric execution unit and the elastic supporting unit is adopted to provide the driving force for simulating the road surface simulation effect, in order to reduce the minimum distance between the supporting platform for supporting the vehicle and the ground, the electric execution unit is arranged on the upper surface of the supporting platform in an inverted mode, compared with the direct supporting structure of the hydraulic supporter in the prior art, the height of the limited supporting platform from the ground can be shortened to a certain extent by the inverted electric execution unit, the limitation of the shortest length of the hydraulic supporter on the minimum supporting height of the supporting platform is eliminated, the distance between the supporting platform and the ground can be reduced according to the requirement, an operator can transfer the vehicle or the suspension structure to the supporting platform more conveniently, and therefore the operator does not need to lift the vehicle or the suspension structure weighing several tons to a larger height when transferring or installing the vehicle or the suspension structure. In addition, the controllability of the vehicle or the suspension structure on the supporting platform can be improved due to the reduction of the supporting height, an operator can perform related operations on the ground without standing on the height lifting device to transfer, fix and test the vehicle or the suspension structure, and the safety of the operator during testing is indirectly improved. The working mode that the supporting platform simulates the road excitation under the action of the supporting force provided by the hydraulic supporting device is adjusted into the working mode that the supporting platform simulates the road excitation under the action of the traction force provided by the electric execution unit, so that the problem that the sufficient supporting force cannot be provided effectively due to insufficient hydraulic pressure when the supporting platform is driven to rise to the highest point of an uplink movement path due to self abrasion and leakage of hydraulic oil is avoided, particularly, the process that the supporting platform drives the vehicle or the suspension frame structure to lift is a gravity increasing process, and the supporting force of the hydraulic supporting device is decomposed to a certain force along with the increase of the supporting height, so that the sufficient supporting force cannot be provided effectively is solved. Compared with the situation that the hydraulic support needs position detection and a precise electro-hydraulic valve component when in use, and particularly the hydraulic oil can creep under the condition of leakage, the electric execution unit has good repeatability and can continuously perform rigid braking for many times, so that the movement process of high and low fluctuation can be better simulated.
Compared with a single hydraulic support, the elastic support unit capable of providing a second driving force for the support platform is further mounted on the lower surface of the support platform on the basis of the arrangement of the inverted electric execution unit, so that the elastic support unit and the electric execution unit can act together to provide a driving force for the support platform to simulate road surface excitation. Particularly, the elastic supporting unit can generate driving forces with the same or opposite directions to the traction force of the electric execution unit at different heights, so that the supporting platform can simulate road surface excitation conditions more truly, the relevant sensing unit can monitor the motion parameters of the vehicle or the suspension structure on the supporting platform under the conditions closer to the real road surface excitation conditions, and the performance parameters of the vehicle or the suspension structure can be acquired more accurately.
According to a preferred embodiment, the elastic supporting unit can limit the initial height of the supporting platform when the whole vehicle rack is placed on the vehicle dynamic test bed, so that the electric execution unit drives the supporting platform to move upwards along the axial direction of the electric execution unit, and the supporting platform can simulate road surface excitation conditions. The elastic supporting unit and the electric execution unit can work cooperatively, so that the supporting platform can simulate ground excitation conditions more vividly, the working power of the electric execution unit is effectively reduced, and the manufacturing cost is greatly reduced.
According to a preferred embodiment, a part of the bottom plate is located outside the space defined by the space frame, and the elastic support unit is supported on the part of the bottom plate, so that the elastic support unit can be located under the tire of the whole vehicle rack, and the elastic support unit is connected with the outer end of the support platform.
According to a preferred embodiment, the inner end of the supporting platform is connected with the three-dimensional frame through a linear guide rail, and the linear guide rail is arranged on a supporting column of the supporting frame, so that the inner end of the supporting platform can move back and forth on the linear guide rail along with the extension and retraction of the electric execution unit, and the outer end of the supporting platform is driven to move up and down.
According to a preferred embodiment, a plurality of sensing units capable of monitoring the motion parameter information of the whole vehicle rack are further installed on the supporting platform, the sensing units can collect the motion parameter information of the whole vehicle rack when the whole vehicle rack follows the supporting platform to move up and down, and the collected motion parameter information is fed back to the control cabinet. The sensor unit is arranged in a positioning mode, so that the sensor unit can accurately acquire real-time motion parameter information of the whole vehicle rack in the up-and-down fluctuating motion process, and related information about the smoothness of the whole vehicle rack is acquired.
According to a preferred embodiment, a motor driving unit capable of controlling at least one electric execution unit to move up and down and a controller capable of receiving motion parameter information fed back by the sensing unit are arranged in the control cabinet.
According to a preferred embodiment, the sensing unit at least comprises an acceleration sensing unit, a displacement sensing unit and a force sensing unit, wherein the displacement sensing unit and the force sensing unit can monitor the position of the whole vehicle frame on the supporting platform, and the force sensing unit can acquire the supporting force of the supporting platform when the supporting platform stably supports the whole vehicle frame and/or drives the whole vehicle frame to move up and down.
The technical scheme of the invention also provides a road surface excitation simulation system which at least comprises an electric execution unit, a supporting platform, an elastic supporting unit and a supporting frame, wherein the supporting frame is provided with at least one three-dimensional frame capable of accommodating the electric execution unit, and the electric execution unit is arranged on the lower plate surface of a top plate body formed as the axial upper end surface of the three-dimensional frame in an inverted mode, so that the electric execution unit can perform telescopic motion along the axial direction of the electric execution unit according to the mode that the electric execution unit can change the supporting height of the supporting platform; the lower end surface of the supporting platform is further connected with an elastic supporting unit which is supported on a bottom plate body of the supporting frame, and the electric execution unit can work in cooperation with the elastic supporting unit, so that the supporting platform can move up and down along with the expansion of the electric execution unit. The road surface excitation simulation platform of the suspension dynamic test system provided by the invention has the advantages that the electric execution unit is adopted to replace the existing hydraulic actuator, the environment of a vehicle dynamic test platform is improved, and the cost consumption is reduced. The road surface excitation simulation platform adopts an inverted mode to install the electric execution unit in the support frame, so that the height difference between the support platform for supporting the tires of the whole vehicle rack and the ground is effectively reduced, the danger in the test process is reduced, and the flexibility of arrangement in the test process is increased. In addition, the sensing unit installed on the vehicle dynamic test bed can accurately provide the motion parameter information of the whole vehicle rack. Therefore, the dynamics of the vehicle body and the suspension of the whole vehicle rack can be researched more simply, conveniently, safely and labor-saving.
The technical scheme of the invention further provides a suspension dynamic testing device which at least comprises at least one testing structure constructed by the road surface excitation simulation platform, wherein the testing structure can selectively support a whole vehicle rack of a multi-axis vehicle, and the road surface excitation simulation platform enables a sensing unit arranged on a vehicle frame to monitor real-time changing motion parameter information in a mode of driving wheels of the whole vehicle rack to move. The road surface excitation simulation platform of the suspension dynamic test system provided by the invention has the advantages that the electric execution unit is adopted to replace the existing hydraulic actuator, the environment of the vehicle dynamic test platform is improved, and the replacement cost of elements such as the electric execution unit is reduced. The road surface excitation simulation platform adopts an inverted mode to install the electric execution unit in the support frame, so that the height difference between the support platform for supporting the tires of the whole vehicle rack and the ground is effectively reduced, the danger in the test process is reduced, and the flexibility of arrangement in the test process is increased. In addition, the motion parameter information of the whole vehicle rack can be accurately provided through the sensing unit arranged on the vehicle dynamic test bed. Therefore, the dynamics of the vehicle body and the suspension of the whole vehicle rack can be researched more simply, conveniently, safely and labor-saving. In addition, the pavement excitation simulation platform can also collect motion parameter information of other platforms such as half-car, quarter-car or three-axle cars, so that the research on the dynamic performance of the car body and the suspension can be completed more accurately.
According to a preferred embodiment, the test structure supports at least one of the wheels so that the road surface excitation simulation station arranged in the test structure can be matched to the wheel.
Drawings
FIG. 1 is a schematic workflow diagram of a preferred suspension dynamics testing system in accordance with the present invention;
FIG. 2 is a schematic structural diagram of a single road surface excitation simulation platform with tires and a frame of a preferred suspension dynamic test system according to the present invention;
FIG. 3 is a schematic structural diagram of a single road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention;
FIG. 4 is an elevation view of a single road surface excitation simulation platform of a preferred suspension dynamics testing system proposed by the present invention;
FIG. 5 is a rear view of a single road surface excitation simulation bench of a preferred suspension dynamics testing system in accordance with the present invention;
FIG. 6 is a schematic diagram of the installation position of the acceleration sensing unit of a preferred suspension dynamic test system according to the present invention;
FIG. 7 is a schematic diagram of a control cabinet of a preferred suspension dynamics testing system according to the present invention;
FIG. 8 is a schematic diagram of a control circuit of an electric actuator of a road surface excitation simulation platform of a preferred suspension dynamic testing system according to the present invention;
fig. 9 is a schematic diagram of information acquisition of a force sensing unit and an acceleration sensing unit of a preferred suspension dynamics testing system according to the present invention.
Fig. 10 is a schematic diagram of the installation position of the displacement sensing unit of the road excitation simulation platform of the preferred suspension dynamic testing system.
Fig. 11 is a left side view of the mounting position of the force sensing unit of the road surface excitation simulation table of a preferred suspension dynamic testing system proposed by the present invention.
Fig. 12 is a right side view of the mounting position of the force sensing unit of the road surface excitation simulation table of a preferred suspension dynamics testing system proposed by the present invention.
Fig. 13 is a schematic structural diagram of a quarter of a vehicle rack of a preferred suspension dynamics testing apparatus according to the present invention.
Fig. 14 is a schematic view showing the installation positions of the force sensing unit, the acceleration sensing unit and the displacement sensing unit of a quarter of the entire vehicle gantry of a preferred suspension dynamics testing apparatus according to the present invention.
Fig. 15 is a schematic diagram of a control circuit of an electric actuator of a road excitation simulation platform in a quarter of a whole vehicle platform of a preferred suspension dynamic testing device.
Fig. 16 is a schematic diagram of information acquisition of a force sensing unit, an acceleration sensing unit and a displacement sensing unit in a quarter of a whole vehicle rack of a preferred suspension dynamic testing device.
List of reference numerals
1: a control cabinet; 2: a vehicle dynamic test stand; 3: a linear guide rail; 4: a sensing unit; 5: a whole vehicle rack; 6: an electric actuator; 7: a support platform; 8: an elastic support unit; 9: a support frame; 11: a motor drive unit; 12: a controller; 21: a first road excitation simulation platform; 22: a second road surface excitation simulation platform; 23: a third path of surface excitation simulation platform; 24: a fourth road surface excitation simulation platform; 31: a first linear guide rail; 32: a second linear guide rail; 33: a third linear guide rail; 34: a fourth linear guide rail; 41: an acceleration sensing unit; 42: a displacement sensing unit; 43: a force sensing unit; 411: a first acceleration sensing unit; 412: a second acceleration sensing unit; 413: a third acceleration sensing unit; 414: a fourth acceleration sensing unit; 415: a fifth speed sensing unit; 416: a sixth acceleration sensing unit; 417: a seventh acceleration sensing unit; 421: a first displacement sensing unit; 422: a second displacement sensing unit; 423: a third displacement sensing unit; 424: a fourth displacement sensing unit; 431: a first force sensing unit; 432: a second force sensing unit; 433: a third force sensing unit; 434: a fourth force sensing unit; 51: a vehicle body; 52: a wheel; 53: a frame; 91: a top plate body; 92: a bottom plate body; 93: and (4) a support column.
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
Example 1
The application provides a suspension dynamic test system, it includes switch board 1, vehicle dynamic test platform 2, sensing unit 4 and whole car rack 5.
According to a specific embodiment, the vehicle dynamic test platform 2 can drive the whole vehicle platform frame 5 placed on the vehicle dynamic test platform 2 to move up and down according to a control command sent by the controller 12. The sensing unit 4 is arranged on the vehicle dynamic test stand 2 and the whole vehicle rack 5 in a manner of monitoring the motion parameters of the whole vehicle rack 5. The sensing unit 4 can acquire motion parameters such as acceleration, position and pressure of the whole vehicle rack 5 when moving along with the vehicle dynamic test bed 2, and feed back the acquired motion parameters to the controller 12. The controller 12 analyzes and processes the received motion parameters, so as to obtain the dynamic performance of the entire vehicle rack 5.
Preferably, the vehicle dynamic test stand 2 is provided with four road surface excitation simulation stands in a manner capable of corresponding to the number of wheels to be supported, that is, the vehicle dynamic test stand 2 is composed of a first road surface excitation simulation stand 21, a second road surface excitation simulation stand 22, a third road surface excitation simulation stand 23 and a fourth road surface excitation simulation stand 24 which support the wheels 52 of the entire vehicle frame 5, respectively. Preferably, the entire vehicle gantry 5 can be either a complete vehicle or a separate suspension structure. As shown in fig. 2, any one of the road surface excitation simulation platforms includes an electric actuator unit 6, a support platform 7, an elastic support unit 8, and a support frame 9. Preferably, the support frame 9 comprises a top plate 91, a bottom plate 92 and a support column 93. The four corners of the top plate 91 are connected to the supporting posts 93 perpendicular to the plate surface. The support column 93 is vertically disposed on the bottom plate body 92 such that the top plate body 91 is supported above the bottom plate body 92. Preferably, the plate area of the bottom plate 92 is larger than the plate area of the top plate 91, so that part of the plate surface of the bottom plate 92 is located outside the space frame defined by the top plate 91, the bottom plate 92 and the support posts 93. Preferably, the size of the cross-section of the space frame is defined by the size of the plate area of the top plate 91 and the height of the space frame is defined by the length of the support posts 93. Preferably, the elastic supporting unit 8 is further disposed on a portion of the bottom plate 92 extending out of the space frame. Preferably, the electric actuator unit 6 is connected to the top plate 91 in such a manner as to be mounted upside down in the space frame. Specifically, the electric actuator unit 6 is inverted such that the bottom of the electric actuator unit 6 is at the upper axial end thereof, the top of the electric actuator unit 6 is at the lower axial end thereof, the bottom of the electric actuator unit 6 is fixedly mounted on the lower plate surface of the top plate 91, such that the electric actuator unit 6 is located in the space defined by the space frame, and the end of the electric actuator unit 6 away from the top plate 91 is elongated in a manner gradually approaching the bottom plate 92. Preferably, the top of the electric actuator unit 6 is also connected with a support platform 7. The plane defined by the support platform 7 and the top panel 91 are parallel to each other and the area of the support platform 7 may be equal to the area of the bottom panel 92 such that the support platform 7 includes an inner end located inside the space frame and an outer end located outside the space frame. Preferably, the inner end of the support platform 7 located inside the space frame is movably connected with the support column 93 through the linear guide 3, so that the support platform 7 can perform up-and-down translation along the axis of the support column 93. The arrangement mode of the electric execution unit 6 effectively reduces the height difference between the supporting platform 7 for fixing the wheels 52 and the ground, reduces the danger of operators in the test process, and increases the flexibility of structural arrangement in the test process, so that the operators can complete the transfer, installation and test of the whole vehicle rack 5 more safely and more laborsavingly.
The initial length (length without external force) of the elastic supporting unit 8 is between the shortest length and the longest length of the electric execution unit 6, so that when the electric execution unit 6 drives the supporting platform 7 to be lowered to the lowest height and fixes the whole vehicle rack 5 on the supporting platform 7, the elastic supporting unit 8 is in a compression state and can provide an upward supporting force for the supporting platform 7, thereby reducing the supporting force required by the electric execution unit 6, reducing the driving force required by the electric execution unit 6, avoiding the overload risk in the process of driving the supporting platform 7 to simulate road excitation by the electric execution unit 6, and further prolonging the service life of the electric execution unit 6. In the process that the electric execution unit 6 drives the supporting platform 7 to ascend, the elastic potential energy stored in the compressed elastic supporting unit 8 is released, so that the electric execution unit 6 and the elastic supporting unit 8 can provide a larger driving force for the supporting platform 7 in the initial ascending stage, the high kinetic energy state of the vehicle in the initial ascending motion stage when the vehicle triggers the road surface excitation condition can be more specifically simulated, and the supporting platform 7 has a larger acceleration in the initial ascending motion stage. With the ascending of the supporting platform 7, the driving force which can be provided by the elastic supporting unit 8 is gradually reduced, so that the supporting platform 7 continuously ascends mainly under the traction force of the electric actuating unit 6, and in the process, the acceleration of the supporting platform 7 is gradually reduced. During the further ascending movement of the support platform 7, the length of the elastic support unit 8 is gradually lengthened, and in this stage, the elastic support unit 8 provides no support force for promoting the movement of the support platform 7, but provides a pulling force for resisting the continuous ascending of the support platform 7 opposite to the direction of the pulling force provided by the electric actuator unit 6, and this process can further reduce the acceleration of the support platform 7, so that the ascending speed of the support platform 7 is slowed down until the support platform 7 moves to the maximum height. In the next stage, the direction of the traction force provided by the electric actuator unit 6 is changed, which drives the support platform 7 to move downwards, and at this time, the direction of the traction force of the elastic support unit 8 is the same as that of the traction force provided by the electric actuator unit 6, so that the support platform 7 can have a larger acceleration in the initial stage of descending. When the length of the elastic supporting unit 8 is smaller than the initial length, the elastic supporting unit 8 starts to provide a supporting force opposite to the moving direction of the supporting platform 7, and the supporting force generated by the elastic supporting unit 8 can counteract the traction force of the electric actuating unit 6, so that the traction force provided by the electric actuating unit 6 is gradually reduced. The movement of the support platform 7 at this stage can visually simulate the movement of the vehicle after contact with the ground. Through the interaction or the synergistic effect of the electric execution unit 6 and the elastic support unit 8 in different stages, the support platform 7 can more accurately simulate the change of the motion state of the vehicle when the road surface excitation condition is triggered, so that the change of the sensing parameters of different positions of the whole vehicle rack 5 (the vehicle or the suspension structure) can be more accurately acquired by each sensing unit 4 on the whole vehicle rack 5 (the vehicle or the suspension structure), and the operator can be helped to perform structural reinforcement or vibration reduction on different stress areas of the whole vehicle rack 5 (the vehicle or the suspension structure).
As shown in fig. 3, 4 and 5, the support platform 7 is connected to the support frame 9 by a first linear guide 31, a second linear guide 32, a third linear guide 33 and a fourth linear guide 34, so that the support platform 7 is parallel to the ground. The lower surface of the outer end of the supporting platform 7 is connected with the top end of the elastic supporting unit 8. One end of the elastic supporting unit 8 is connected with the supporting platform 7, and the other end of the elastic supporting unit 8 is connected with the bottom plate 92. Each wheel 52 of the complete vehicle frame 5 is fixed on the support platform 7. The elastic supporting unit 8 can provide the static load of the whole vehicle frame 5, so that the electric execution unit 6 is in a non-working state in the initial stage, and the power of the electric execution unit 6 in working is reduced. Preferably, the elastic support unit 8 may employ a coil spring. Since the electric actuator unit 6 is connected to the support platform 7 in an inverted manner, the distance of the support platform 7 from the ground is greatly reduced. The invention adopts the electric execution unit 6 to replace the original hydraulic actuator, thereby improving the environment of the vehicle dynamic test bed 2 and reducing the manufacturing cost. In prior art, hydraulic actuator's minimum support height is great, and operating personnel need utilize solitary equipment of hanging in midair to assist and just can accomplish the installation when shifting whole car rack 5 to supporting platform 7 to the mounting height of whole car rack 5 is too high, has great risk of dropping, seriously influences operating personnel's personal safety. Therefore, this application is through turning upside down the electronic execution unit 6 of adjusting the supporting platform height on the lower face of top plate body 91 for the initial height of supporting platform 7 can be reduced as far as possible, makes things convenient for operating personnel to shift the whole car rack 5 that awaits measuring to supporting platform 7 on. In addition, the elastic supporting unit 8 capable of providing initial supporting force for the supporting platform 7 is introduced to the bottom of the supporting platform 7, so that the size of the control force required to be output by the electric execution unit 6 in the testing process is reduced, the service life of the electric execution unit 6 is prolonged, the electric execution unit 6 is prevented from being damaged under the condition of large torque output, the manufacturing cost is greatly reduced, and meanwhile, the element replacement cost of the vehicle dynamic test bed 2 is also reduced.
As shown in fig. 3, when the vehicle dynamic test bed 2 works, the inverted electric execution unit 6 extends and contracts to drive the support platform 7 to move.
As shown in fig. 5, since the supporting platform 7 is connected to the supporting frame 9 through the linear guide 3, the outer end of the supporting platform 7 moves synchronously with the inner end, so that the outer end of the supporting platform 7 drives the entire vehicle rack 5 to move.
As shown in fig. 1, the first, second, third and fourth road surface excitation simulation stages 21, 22, 23 and 24 can perform up-and-down rolling motion so as to simulate road surface excitation conditions.
As shown in fig. 7, the control cabinet 1 may include four motor drive units 11 and one controller 12. Preferably, the control cabinet 1 may be installed in the vehicle dynamic test stand 2.
As shown in fig. 8 and 10, the control circuit of the electric actuator unit 6 of the road surface excitation simulation platform is connected to the controller 12, the controller 12 can send pulse signals to four motor drive units 11, each motor drive unit 11 drives the corresponding electric actuator unit 6 according to the signals sent by the controller 12, each electric actuator unit 6 feeds back its encoder signal to the motor drive unit 11, and the electric actuator units 6 drive the corresponding load positions (the first displacement sensing unit 421 at the load position of the first road surface excitation simulation platform 21, the second displacement sensing unit 422 at the load position of the second road surface excitation simulation platform 22, the third displacement sensing unit 423 at the load position of the third road surface excitation simulation platform 23, and the fourth displacement sensing unit 424 at the load position of the fourth road surface excitation simulation platform 24), respectively, so that the displacement sensing unit 42 at the load position obtains sensor information. By feeding back the sensor information monitored by the displacement sensing units 42 arranged at different load positions to the controller 12, the controller 12 can acquire accurate displacement information of the entire vehicle rack 5 in the road surface excitation simulation process.
As shown in fig. 1 and 10, when the road surface excitation simulated by the electric actuator unit 6 in the first, second, third and fourth road surface excitation simulation stages 21, 22, 23 and 24 acts on the entire vehicle bed, the displacement sensing unit 42 and the acceleration sensing unit 41 obtain corresponding sensor information and feed back the obtained sensor information to the controller 12. The controller 12 compresses the sensor information and returns the sensor information to the upper computer. The upper computer can obtain the motion information of the mass center of the whole vehicle rack 5 and/or the wheels 52 by converting and calculating the sensor information.
As shown in fig. 9, 11 and 12, the electric actuator 6 in the road surface excitation simulation platform simulates the working condition of the road surface excitation acting on the entire vehicle platform 5, and the present invention obtains the sensor information capable of accurately representing the pressure information between the entire vehicle platform 5 and the supporting platform 7 in the road surface excitation simulation process through the first force sensing unit 431, the second force sensing unit 432, the third force sensing unit 433 and the fourth force sensing unit 434 respectively arranged on the supporting platforms 7 of the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23 and the fourth road surface excitation simulation platform 24, and simultaneously transmits the collected sensor information to the controller 12, and the controller 12 returns the sensor information to the upper computer for calculation and analysis, so as to obtain the relevant analysis information of the tire dynamic load of the corresponding wheel 52.
As shown in fig. 1, 6 and 9, when the electric actuator unit 6 in the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23 and the fourth road surface excitation simulation platform 24 simulates road surface excitation acting on the entire vehicle platform 5, the present invention obtains sensor information about acceleration when different positions of the entire vehicle platform 5 are moving, by the first acceleration sensing unit 411, the second acceleration sensing unit 412, the third acceleration sensing unit 413, the fourth acceleration sensing unit 414, the fifth acceleration sensing unit 415, the sixth acceleration sensing unit 416 and the seventh acceleration sensing unit which are respectively arranged at different positions of the entire vehicle platform 5, and simultaneously transmits the collected sensor information to the controller 12, and the controller 12 returns the sensor information to the upper computer for calculation and analysis, so that related analysis information about the smoothness of the vehicle specified in GB/T4970-2009 can be obtained.
Example 2
This embodiment is a further improvement of embodiment 1, and repeated details are not repeated.
A suspension dynamic testing device comprises a road surface excitation simulation platform, a plurality of sensors, a control cabinet 1 and a frame 53.
As shown in fig. 13, the road surface excitation simulation table simulates road surface excitation by up-and-down fluctuation of the support platform 7, thereby moving the carriage 53. Preferably, the frame 53 defines a three-dimensional space, the frame 53 is connected with the wheels 52 and the body 51 through vertically arranged guide rails, and the body 51 is supported by the wheels 52 in the three-dimensional space defined by the frame 53. Preferably, the road surface excitation simulation platform is installed in a three-dimensional space defined by the frame 53, and the road surface excitation simulation platform can support the wheels 52, so that the road surface excitation simulation platform can drive the vehicle body 51 to move up and down by driving the wheels 52 to move up and down. Preferably, a displacement sensing unit 42 is connected to a side edge of the supporting platform 7 of the road surface excitation simulation platform, a force sensing unit 43 is provided on a surface of the supporting platform 7 contacting with the wheel 52, and an acceleration sensing unit 41 is provided on the vehicle body 51. When the road surface excitation simulation platform drives the wheels 52 to move in the three-dimensional space defined by the frame 53, the acceleration sensing unit 41, the displacement sensing unit 42 and the force sensing unit 43 respectively acquire the acceleration, the displacement and the wheel pressure change of the whole vehicle platform 5 in the road surface simulation movement process.
As shown in fig. 14 and 15, the control loop of the electric actuator 6 of the road surface excitation simulation platform is connected to the controller 12, the controller 12 can respectively send pulse signals to the motor driving unit 11, and the motor driving unit 11 drives the electric actuator 6 according to the signals sent by the controller 12. The electric actuator unit 6 feeds back encoder signals to the motor driving unit 11, the electric actuator unit 6 drives the supporting platform 7 to move, and the displacement sensing unit 42 and the force sensing unit 43 on the supporting platform 7 acquire sensor information and feed back the sensor information to the controller 12.
As shown in fig. 14 and 16, when the electric actuator 6 simulates road surface excitation acting on the wheel 52, the force sensing unit 43 obtains corresponding sensor information, and transmits the acquired sensor information to the controller 12, and the controller 12 processes the sensor information and returns the processed sensor information to the upper computer for calculation and analysis, so that analysis information related to the dynamic load of the wheel 52 can be obtained.
As shown in fig. 14 and 16, when the electric actuator in the road surface excitation simulation platform simulates the road surface excitation acting on the vehicle body 51, the acceleration sensing unit 41 obtains corresponding sensor information, and transmits the acquired sensor information to the controller 12, and the controller 12 returns the sensor information to the upper computer for calculation and analysis, so as to obtain the analysis information related to the smoothness of the entire vehicle platform 5 during operation.
Example 3
The application also relates to a road surface excitation simulation system which at least comprises an electric execution unit 6, a supporting platform 7, an elastic supporting unit 8 and a supporting frame 9. The support frame 9 is built with at least one space frame capable of accommodating the electric execution unit 6, the electric execution unit 6 is inversely installed on the lower plate surface of the top plate body 91 formed as the axial upper end surface of the space frame, so that the electric execution unit 6 can extend downwards along the axial direction thereof, and the support platform 7 connected to the axial lower end of the electric execution unit 6 can move up and down along with the expansion and contraction of the electric execution unit 6.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents. Throughout this document, the features referred to as "preferably" are only optional and should not be understood as necessarily requiring that such applicant reserves the right to disclaim or delete any relevant preferred feature at any time.
Claims (10)
1. A suspension dynamic test system comprises a vehicle dynamic test bed (2) for testing the dynamic performance of a vehicle body and a suspension, wherein the vehicle dynamic test bed (2) is provided with at least one road surface excitation simulation bed according to the mode that the vehicle dynamic test bed can correspond to the number of wheels to be supported of a vehicle, the road surface excitation simulation bed is characterized by at least comprising an electric execution unit (6), a support platform (7), an elastic support unit (8) and a support frame (9), wherein,
at least one three-dimensional frame capable of accommodating the electric execution unit (6) is built on the support frame (9), and the electric execution unit (6) is arranged on the lower plate surface of a top plate body (91) formed on the upper axial end surface of the three-dimensional frame in an inverted mode, so that the electric execution unit (6) can perform telescopic motion along the axial direction of the electric execution unit according to the mode that the support height of the support platform (7) can be changed;
the lower end surface of the supporting platform (7) is further connected with an elastic supporting unit (8) supported on a bottom plate body (92) of the supporting frame (9), and the electric execution unit (6) can work in cooperation with the elastic supporting unit (8), so that the supporting platform (7) can move up and down along with the expansion and contraction of the electric execution unit (6).
2. The suspension dynamic test system according to claim 1, characterized in that the elastic support unit (8) is capable of defining an initial height of the support platform (7) when the entire vehicle bench (5) is placed on the vehicle dynamic test stand (2), so that the electric actuator unit (6) enables the support platform (7) to simulate road excitation conditions in such a way as to bring the support platform (7) to move upwards along the axial direction of the electric actuator unit (6).
3. The suspension dynamics test system according to claim 2, characterized in that a part of the bottom plate (92) is located outside the space defined by the space frame, and the elastic support unit (8) is supported on the part of the bottom plate (92) so that the elastic support unit (8) can be located directly under the tire of the entire truck bed (5), the elastic support unit (8) being connected with the outer end of the support platform (7).
4. The suspension dynamic test system according to claim 3, wherein the inner end of the support platform (7) is connected with a three-dimensional frame through a linear guide rail (3), and the linear guide rail (3) is arranged on a support column (93) of the support frame (9), so that the inner end of the support platform (7) can reciprocate on the linear guide rail (3) along with the extension and retraction of the electric execution unit (6), and the outer end of the support platform (7) is driven to move up and down.
5. The suspension dynamic test system according to claim 4, characterized in that a plurality of sensing units (4) capable of monitoring the motion parameter information of the whole vehicle rack (5) are further installed on the supporting platform (7), and the sensing units (4) can collect the motion parameter information of the whole vehicle rack (5) when the whole vehicle rack (5) moves up and down along with the supporting platform (7) and feed the collected motion parameter information back to the control cabinet (1).
6. The suspension dynamic test system according to claim 5, characterized in that a motor driving unit (11) capable of controlling at least one electric actuator unit (6) to move up and down and a controller (12) capable of receiving motion parameter information fed back by the sensing unit (4) are arranged in the control cabinet (1).
7. The suspension dynamic test system according to claim 6, characterized in that the sensing unit (4) comprises at least an acceleration sensing unit (41), a displacement sensing unit (42) and a force sensing unit (43) capable of monitoring the position of the entire vehicle gantry (5) on the supporting platform (7), wherein the force sensing unit (43) is capable of acquiring the supporting force of the supporting platform (7) in stably supporting the entire vehicle gantry (5) and/or driving the entire vehicle gantry (5) to perform a rolling motion.
8. A road surface excitation simulation system is characterized in that the road surface excitation simulation platform at least comprises an electric execution unit (6), a supporting platform (7), an elastic supporting unit (8) and a supporting frame (9),
at least one three-dimensional frame capable of accommodating the electric execution unit (6) is built on the support frame (9), and the electric execution unit (6) is arranged on the lower plate surface of a top plate body (91) formed on the upper axial end surface of the three-dimensional frame in an inverted mode, so that the electric execution unit (6) can perform telescopic motion along the axial direction of the electric execution unit according to the mode that the support height of the support platform (7) can be changed;
the lower end surface of the supporting platform (7) is further connected with an elastic supporting unit (8) supported on a bottom plate body (92) of the supporting frame (9), and the electric execution unit (6) can work in cooperation with the elastic supporting unit (8), so that the supporting platform (7) can move up and down along with the expansion and contraction of the electric execution unit (6).
9. Suspension dynamic testing device, characterized in that it comprises at least one testing structure built by a road surface excitation simulation bench of the previous claims 1-7, said testing structure being able to selectively support the entire vehicle bench (5) of a multi-axle vehicle, and said road surface excitation simulation bench enables the sensing unit (4) arranged on the vehicle frame (53) to monitor the real-time varying motion parameter information by means of driving the wheels (52) of the entire vehicle bench (5) into motion.
10. The suspension dynamics testing apparatus according to claim 9, characterized in that said test structure supports at least one of said wheels (52) so that said road surface excitation simulation platform provided in said test structure can be matched with said wheel (52).
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| CN202210248226 | 2022-03-14 | ||
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116698452A (en) * | 2023-07-28 | 2023-09-05 | 山东首达汽车制造有限公司 | Semitrailer suspension performance testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116698452A (en) * | 2023-07-28 | 2023-09-05 | 山东首达汽车制造有限公司 | Semitrailer suspension performance testing device |
| CN116698452B (en) * | 2023-07-28 | 2023-10-31 | 山东首达汽车制造有限公司 | Semitrailer suspension performance testing device |
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