CN117928987A - Suspension system test bed and test method based on road load spectrum - Google Patents

Abstract

The application relates to a suspension system test bed and a test method based on a road load spectrum, wherein the test bed comprises the following steps: the suspension loading device comprises a suspension frame loading body, a loading device and a loading device, wherein the suspension frame loading body comprises a rim connecting tool for connecting the suspension frame, and an actuator connecting tool for connecting a loading actuator is fixedly connected to the bottom of the rim connecting tool; the loading actuator comprises a vertical actuator, a transverse actuator and a longitudinal actuator which are connected with the actuator connecting tool and respectively apply vertical acting force, transverse acting force and longitudinal acting force to the suspension; the directions of the vertical acting force, the transverse acting force and the longitudinal acting force applied by the vertical actuator, the transverse actuator and the longitudinal actuator respectively intersect at a point, and the distance between the vertical acting force, the transverse acting force and the longitudinal acting force and the center point of the rim is equal to the radius of the tire on the rim. The application can simulate the complex stress condition of the suspension system in the real vehicle state, more truly reproduces the excitation of the suspension system on the actual road surface through the rack, ensures that the failure mode of the suspension is consistent with the actual failure mode, and really plays the role of checking the suspension system.

Description

Suspension system test bed and test method based on road load spectrum

Technical Field

The application relates to the technical field of suspension testing of passenger vehicles, in particular to a suspension system test bed and a test method based on a road load spectrum.

Background

Automotive suspensions are important devices in automobiles that connect the body to the wheels of the vehicle elastically. The device is generally composed of elastic elements, guide mechanisms, shock absorbers and other parts, and has the main task of relieving the impact transmitted to a vehicle body by an uneven road surface so as to improve riding comfort, and simultaneously has the function of supporting the vehicle body, so that the performance of a suspension system is significant to the vehicle body, and in order to detect the service life of the suspension system or continuously optimize the design structure of the suspension system, each part in the suspension system needs to be tested, and the environment of the vehicle needs to be simulated by using a bench test.

The bench test of the automobile suspension system in the prior art comprises the following specific test processes: load data of the suspension system are collected, a test driving signal is obtained through repeated iteration by software, and the controller drives the loading actuator according to the driving signal, so that a road simulation bench test of the suspension system of the passenger car with multiple channels and road load spectrum loading can be carried out.

However, load data acquisition points (strain gauges are used for acquiring load data, the strain gauges are arranged at different positions, and the acquired load data are different), and loading points (the actuators are used for providing loading force for a vehicle and are equivalent to transmission points for simulating ground excitation transmission to a vehicle body) of loading actuators, so that the setting positions of the actuators are different, and the positions of the loading force are also different), all have influence on test results, and the test results of the suspension system obtained by the method are inaccurate.

As known from the bench test procedure of the automotive suspension system in the prior art, the loading force is provided to the loading actuator of the test vehicle to simulate the process that the ground excitation is transmitted to the vehicle body through the loading point, but the ground excitation is not only related to road condition information, but also related to the braking condition of the vehicle. For example, in the same road condition, the acceleration running process and the deceleration running process are different in excitation transmission of the ground to the vehicle body, and if the load spectrum is collected by adopting the same collection point under any working condition, the excitation transmission of the road surface to the vehicle body under the current road condition and the vehicle braking condition can not be truly reflected, so that errors are caused to the subsequent test process, and the test accuracy is affected.

Disclosure of Invention

The embodiment of the application provides a suspension system test bench and a test method based on a road load spectrum, which are used for solving the problem that the bench test of an automobile suspension system in the related art is inaccurate because the bench test of an actuator is not explicitly required to be installed.

The embodiment aspect of the application provides a suspension system test bed based on a road load spectrum, which comprises the following components:

The suspension adding carrier comprises a rim connecting tool for connecting the suspension, and an actuator connecting tool for connecting a loading actuator is fixedly connected to the bottom of the rim connecting tool;

The loading actuator comprises a vertical actuator, a transverse actuator and a longitudinal actuator which are connected with the actuator connecting tool and respectively apply vertical acting force, transverse acting force and longitudinal acting force to the suspension;

the directions of the vertical acting force, the transverse acting force and the longitudinal acting force applied by the vertical actuator, the transverse actuator and the longitudinal actuator respectively intersect at one point, and the distance between the vertical acting force, the transverse acting force and the longitudinal acting force and the center point of the rim is equal to the radius of the tire on the rim.

In some embodiments: the rim connection tool comprises a vertical mounting plate with an isosceles trapezoid structure, a plurality of mounting holes for connecting a suspension are formed in the vertical mounting plate, a transverse mounting plate is connected to the bottom of the vertical mounting plate, and the actuator connection tool is fixedly connected to the bottom of the transverse mounting plate.

In some embodiments: the utility model discloses a hydraulic actuator, including vertical mounting panel, horizontal mounting panel, actuator connection frock, vertical mounting panel, horizontal mounting panel, the both sides of vertical mounting panel all be equipped with the triangle-shaped strengthening rib that horizontal mounting panel is connected, triangle-shaped strengthening rib respectively with vertical mounting panel and horizontal mounting panel welded connection, set up on the horizontal mounting panel and be connected the mounting hole of frock is connected to the actuator.

In some embodiments: the actuator connection tool is of a rectangular cylinder structure, and threaded holes for respectively connecting the transverse mounting plate, the vertical actuator, the transverse actuator and the longitudinal actuator are formed in the outer wall of the actuator connection tool.

In some embodiments: the vertical actuator, the transverse actuator and the longitudinal actuator comprise loading actuators, a force transducer connected to a telescopic arm of each loading actuator, and a universal joint connected with the force transducer, and the universal joint is fixedly connected with the actuator connecting tool.

In some embodiments: the loading actuator further includes a controller that applies control signals to the vertical, lateral and longitudinal actuators.

The second aspect of the embodiment of the application provides a suspension system test method based on a road load spectrum, which comprises the following steps:

step 1, obtaining a reference road surface excitation signal and a test vehicle with a plurality of preset acquisition points, installing strain gauges on the preset acquisition points of the test vehicle, and performing a real vehicle test on the test vehicle under a road surface corresponding to the reference road surface excitation signal to obtain road spectrum data of the preset acquisition points of the test vehicle under the road surface;

step 2, under each group of road surfaces, respectively comparing road spectrum data acquired by all preset acquisition points of the test vehicle with a reference road surface excitation signal, finding road spectrum data with similarity smaller than a first preset threshold value with the reference road surface excitation signal, and taking the preset acquisition point corresponding to the road spectrum data as a target acquisition point corresponding to the group of road surfaces;

Step 3, installing a strain gauge at a target acquisition point of a vehicle to be tested, and performing a real-vehicle test on a test vehicle in a test field to obtain a load spectrum when road surface excitation is transmitted to the target acquisition point;

And 4, obtaining a transfer function from a loading point of the actuator to a load spectrum acquisition point through white noise, obtaining a primary test control signal from a load spectrum according to an inverse transfer function of the transfer function, performing multiple iterations by RPC software to obtain a final test control signal, and inputting the final test control signal into the suspension system test bed based on the road load spectrum according to any embodiment, so that a bed test can be performed.

In some embodiments: the reference road surface excitation signal is a continuous road surface excitation signal or a random road surface excitation signal, wherein the continuous road surface excitation signal is continuous excitation along the length direction of a road, and the random road surface excitation signal is intermittent excitation with impact effect.

In some embodiments: the step 2 specifically comprises the following steps:

And when the absolute values of the difference values of A1 and B1 in the time domain signals of all the time domain signals on all the preset acquisition points of the test vehicle are smaller than a first preset threshold value, the similarity between the road spectrum data acquired by the preset acquisition points and the reference road surface excitation signal is high, and the preset acquisition points are selected as the corresponding target acquisition points of the group of roads.

In some embodiments: obtaining a primary test control signal from a load spectrum according to an inverse transfer function of the transfer function, comprising:

And obtaining a loading signal which is applied by the loading point of the actuator according to the inverse function of the transfer function, and dividing the loading signal into longitudinal, transverse and vertical primary test control signals.

The technical scheme provided by the application has the beneficial effects that:

The embodiment of the application provides a suspension system test bed based on a road load spectrum and a test method, wherein a suspension loading body is arranged on the applied suspension system test bed based on the road load spectrum, the suspension loading body comprises a rim connecting tool used for connecting a suspension, and an actuator connecting tool used for connecting a loading actuator is fixedly connected to the bottom of the rim connecting tool; the loading actuator comprises a vertical actuator, a transverse actuator and a longitudinal actuator which are connected with the actuator connecting tool and respectively apply vertical acting force, transverse acting force and longitudinal acting force to the suspension; the directions of the vertical acting force, the transverse acting force and the longitudinal acting force applied by the vertical actuator, the transverse actuator and the longitudinal actuator respectively intersect at a point, and the distance between the vertical acting force, the transverse acting force and the longitudinal acting force and the center point of the rim is equal to the radius of the tire on the rim.

The application therefore makes it possible for all actuators to exert a loading force from the ground point of the vehicle, where it is possible to simulate not only the situation in which the road surface transmits excitation to the vehicle body (because the vehicle is always in contact with the road surface, from which the excitation of the road surface is also transmitted to the vehicle) but also the downward load situation in which the vehicle body is transmitted from above to the contact point, which can better simulate the real vehicle situation. The complex stress condition of the suspension system in the real vehicle state can be simulated more, the excitation of the suspension system on the actual road surface can be reproduced more truly through the rack, the failure mode of the suspension is ensured to be consistent with the actual failure mode, and the effect of checking the suspension system is really achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a suspension system test stand according to an embodiment of the present application;

FIG. 2 is a flow chart of a test method for a suspension system test bed according to an embodiment of the present application.

Reference numerals:

10. Adding a carrier to a suspension; 11. rim connecting tools; 12. the actuator is connected with the tool; 13. a vertical mounting plate; 14. a transverse mounting plate; 15. triangular reinforcing ribs; 20. loading an actuator; 21. a vertical actuator; 22. a transverse actuator; 23. a longitudinal actuator; 24. a load cell; 25. a universal joint; 30. and (3) a suspension.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a suspension system test bench and a test method based on a road load spectrum, which can solve the problem that the bench test of an automobile suspension system in the related art is inaccurate because the bench test of the automobile suspension system does not explicitly require the mounting position of an actuator.

Referring to fig. 1, a first aspect of an embodiment of the present application provides a suspension system test stand based on a road load spectrum, including:

The suspension adding carrier 10, the suspension adding carrier 10 comprises a rim connecting tool 11 for connecting a rim on the suspension 30, and an actuator connecting tool 12 for connecting a loading actuator 20 is fixedly connected to the bottom of the rim connecting tool 11.

The loading actuator 20, the loading actuator 20 comprising a vertical actuator 21, a lateral actuator 22 and a longitudinal actuator 23 connected to the actuator connection tooling 12 and applying a vertical force, a lateral force and a longitudinal force, respectively, to the suspension 30.

Wherein the directions of the vertical acting force, the transverse acting force and the longitudinal acting force applied by the vertical actuator 21, the transverse actuator 22 and the longitudinal actuator 23 respectively intersect at a point and the distance from the center point of the rim is equal to the radius of the tire on the rim.

The position where the directions of the vertical acting force, the lateral acting force and the longitudinal acting force applied by the vertical actuator 21, the lateral actuator 22 and the longitudinal actuator 23 respectively intersect with one point is the contact point of the tire and the road surface, because the tire always has one contact point with the road surface when the vehicle runs, and the excitation of the road surface is transmitted to the vehicle from the contact point.

According to the embodiment of the application, all actuators apply loading force from the grounding point position of the vehicle, and the loading force is applied at the grounding point position of the vehicle, so that not only can the condition that the road surface transmits excitation to the vehicle body be simulated, but also the condition that the vehicle body transmits downward load to the contact point from above be simulated, and the contact point can better simulate the real vehicle state.

The application can simulate the complex stress condition of the suspension system in the real vehicle state, and the excitation of the suspension system on the actual road surface can be more truly reproduced through the rack, so that the failure mode of the suspension 30 is ensured to be consistent with the actual failure mode, and the effect of checking the suspension system is truly achieved.

In some alternative embodiments: referring to fig. 1, an embodiment of the present application provides a suspension system test stand based on a road load spectrum, where a rim connection tool 11 of the suspension system test stand includes a vertical mounting plate 13 having an isosceles trapezoid structure, and a plurality of mounting holes for connecting a rim on a suspension 30 are formed in the vertical mounting plate 13. The bottom of the vertical mounting plate 13 is connected with a transverse mounting plate 14, and the actuator connecting tool 12 is fixedly connected to the bottom of the transverse mounting plate 14.

Triangular reinforcing ribs 15 connected with the transverse mounting plates 14 are arranged on two sides of the vertical mounting plates 13, the triangular reinforcing ribs 15 are respectively welded with the vertical mounting plates 13 and the transverse mounting plates 14, and mounting holes for connecting the actuator connection tool 12 are formed in the transverse mounting plates 14. The triangular reinforcing ribs 15 are provided with four, and the four triangular reinforcing ribs 15 are symmetrically arranged on two sides of the vertical mounting plate 13 in pairs so as to enhance the structural strength of the connection between the vertical mounting plate 13 and the transverse mounting plate 14.

In some alternative embodiments: referring to fig. 1, an embodiment of the present application provides a suspension system test stand based on a road load spectrum, where an actuator connection tool 12 of the suspension system test stand has a rectangular cylinder structure, and threaded holes for respectively connecting a transverse mounting plate 14, a vertical actuator 21, a transverse actuator 22 and a longitudinal actuator 23 are formed on an outer wall of the actuator connection tool 12.

The vertical actuator 21 is positioned at the top or bottom of the actuator connecting tool 12, and the vertical actuator 21 is used for driving the actuator connecting tool 12 to act along the Z-axis direction; the transverse actuator 22 is located on the left side or the right side of the actuator connecting tool 12, the transverse actuator 22 is used for driving the actuator connecting tool 12 to act along the Y-axis direction, the longitudinal actuator 23 is located on the front side or the rear side of the actuator connecting tool 12, and the longitudinal actuator 23 is used for driving the actuator connecting tool 12 to act along the X-axis direction.

In some alternative embodiments: referring to fig. 1, an embodiment of the present application provides a suspension system test stand based on a road load spectrum, where a vertical actuator 21, a lateral actuator 22 and a longitudinal actuator 23 of the suspension system test stand include a loading actuator, a load cell 24 connected to a telescopic arm of the loading actuator, and a universal joint 25 connected to the load cell 24, where the universal joint 25 is fixedly connected to an actuator connection tool 12.

The loading actuator further comprises a controller for applying control signals to the vertical actuator 21, the horizontal actuator 22 and the longitudinal actuator 23, wherein the controller is used for obtaining a load spectrum when the road surface excitation is transmitted to a target acquisition point according to the real vehicle test of the test vehicle in the test field; and the transfer function from the loading point of the actuator to the load spectrum acquisition point is obtained through white noise, a primary test control signal is obtained from the load spectrum according to the inverse transfer function of the transfer function, and then the final test control signal is obtained through repeated iteration by RPC software to control the loading actuator 20, so that a bench test is performed.

The second aspect of the embodiment of the application provides a suspension system test method based on a road load spectrum, which comprises the following steps:

step 1, obtaining a reference road surface excitation signal and a test vehicle with a plurality of preset acquisition points, installing strain gauges on the preset acquisition points of the test vehicle, and performing a real vehicle test on the test vehicle under a road surface corresponding to the reference road surface excitation signal to obtain road spectrum data of the preset acquisition points of the test vehicle under the road surface;

step 2, under each group of road surfaces, respectively comparing road spectrum data acquired by all preset acquisition points of the test vehicle with a reference road surface excitation signal, finding road spectrum data with similarity smaller than a first preset threshold value with the reference road surface excitation signal, and taking the preset acquisition point corresponding to the road spectrum data as a target acquisition point corresponding to the group of road surfaces;

Step 3, installing a strain gauge at a target acquisition point of a vehicle to be tested, and performing a real-vehicle test on a test vehicle in a test field to obtain a load spectrum when road surface excitation is transmitted to the target acquisition point;

And 4, obtaining a transfer function from a loading point of the actuator to a load spectrum acquisition point through white noise, obtaining a primary test control signal from a load spectrum according to an inverse transfer function of the transfer function, performing multiple iterations by RPC software to obtain a final test control signal, and inputting the final test control signal into the suspension system test bed based on the road load spectrum according to any embodiment, so that a bed test can be performed.

In some alternative embodiments: the embodiment of the application provides a suspension system test method based on a road load spectrum, wherein a reference road surface excitation signal of the suspension system test method is a time domain signal for exciting a vehicle on a road surface, and the reference road surface excitation signal can be obtained by actually measuring random data of the road surface. The reference road surface excitation signal is a continuous road surface excitation signal or a random road surface excitation signal, wherein the continuous road surface excitation signal is continuous excitation along the length direction of a road and can be an asphalt road surface, and the random road surface excitation signal is intermittent excitation with an impact effect and is a discrete event in a short time, and has stronger strength such as pits, road surface cracks and the like.

It should be noted that, what type of road surface corresponds to the obtained reference road surface excitation signal, the test vehicle should perform a real vehicle test under the corresponding road surface type to obtain road spectrum data matched with the road surface type, specifically, the road spectrum data is a time domain signal displayed on the strain gauge at the preset acquisition point along with time when the test vehicle runs on the road surface of the corresponding road surface type.

In some alternative embodiments: the embodiment of the application provides a suspension system test method based on a road load spectrum, wherein the step 2 of the suspension system test method specifically comprises the following steps:

By comparing the time domain signal at each preset acquisition point with the change trend of the time domain signal of the reference road surface excitation signal, road spectrum data with high similarity with the reference road surface excitation signal is obtained, and the change trend can be understood as follows: and when the absolute values of the difference values of A1 and B1 in the time domain signals of all the time domain signals on all the preset acquisition points of the test vehicle are smaller than a first preset threshold value, the similarity between the road spectrum data acquired by the preset acquisition points and the reference road surface excitation signal is high, and the preset acquisition points are selected as the corresponding target acquisition points of the group of roads.

In some alternative embodiments: the embodiment of the application provides a suspension system test method based on a road load spectrum, which comprises the following steps of:

The preset acquisition points of the test vehicle can be set randomly, or can be set according to past experience, and after the test vehicle is set, strain gauges are installed at the preset acquisition points and used for acquiring load data of a road surface when road surface excitation is transmitted to each preset acquisition point. The road spectrum data acquired by each preset acquisition point is compared with a reference road surface excitation signal, road spectrum data which is most similar to the variation trend of the reference road surface excitation signal is found, the preset acquisition point corresponding to the road spectrum data is taken as a target acquisition point, and the road spectrum data acquired by the position of the target acquisition point can be considered to truly and accurately restore the road surface excitation condition of the road surface transmitted to the vehicle body.

Specifically, the target acquisition point capable of truly reproducing the excitation transmission of the road surface to the vehicle body is found through the test vehicle, so that the strain gauge can be directly installed on the target acquisition point on the vehicle to be tested to obtain the load spectrum of the real reproduction road surface excitation. Based on this load spectrum, the transfer function of the actuator load point (vehicle ground point) to the load spectrum acquisition point (target acquisition point) is determined by white noise, and this transfer function is also the most accurate.

According to the inverse function of the transfer function, a loading signal which should be applied by a loading point of the actuator can be obtained, the loading signal is divided into control signals of X direction, Y direction and Z direction, then RPC software is respectively iterated for a plurality of times to obtain final test control signals of each direction, the final test control signals of each direction are input to the actuator of the corresponding direction through the controller, the excitation process of the road surface to the vehicle can be simulated, and the service life of the suspension system can be predicted by detecting the strength and the fatigue degree of the sub-elements of the suspension system under the background.

Principle of operation

The embodiment of the application provides a suspension system test bed based on a road load spectrum and a test method, wherein a suspension loading body 10 is arranged on the applied suspension system test bed based on the road load spectrum, the suspension loading body 10 comprises a rim connecting tool 11 for connecting a suspension 30, and an actuator connecting tool 12 for connecting a loading actuator 20 is fixedly connected to the bottom of the rim connecting tool 11; a loading actuator 20, the loading actuator 20 comprising a vertical actuator 21, a lateral actuator 22 and a longitudinal actuator 23 connected to the actuator connection tooling 12 and applying a vertical force, a lateral force and a longitudinal force to the suspension 30, respectively; the directions of the vertical acting force, the lateral acting force and the longitudinal acting force applied by the vertical actuator 21, the lateral actuator 22 and the longitudinal actuator 23 respectively intersect at a point and the distance from the center point of the rim is equal to the radius of the tire on the rim.

The application therefore makes it possible for all actuators to exert a loading force from the ground point of the vehicle, where it is possible to simulate not only the situation in which the road surface transmits excitation to the vehicle body (because the vehicle is always in contact with the road surface, from which the excitation of the road surface is also transmitted to the vehicle) but also the downward load situation in which the vehicle body is transmitted from above to the contact point, which can better simulate the real vehicle situation. The complex stress condition of the suspension system in the real vehicle state can be simulated more, the excitation of the suspension system on the actual road surface can be reproduced more truly through the rack, the failure mode of the suspension is ensured to be consistent with the actual failure mode, and the effect of checking the suspension system is really achieved.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A suspension system test stand based on road load spectrum, comprising:

The suspension adding carrier (10), wherein the suspension adding carrier (10) comprises a rim connecting tool (11) for connecting a suspension (30), and an actuator connecting tool (12) for connecting a loading actuator (20) is fixedly connected to the bottom of the rim connecting tool (11);

The loading actuator (20), the loading actuator (20) comprises a vertical actuator (21), a transverse actuator (22) and a longitudinal actuator (23) which are connected with the actuator connecting tool (12) and respectively apply vertical acting force, transverse acting force and longitudinal acting force to the suspension (30);

The directions of the vertical acting force, the transverse acting force and the longitudinal acting force which are respectively applied by the vertical actuator (21), the transverse actuator (22) and the longitudinal actuator (23) are intersected at one point, and the distance between the vertical acting force, the transverse acting force and the longitudinal acting force and the center point of the rim is equal to the radius of the tire on the rim.

2. A suspension system test stand based on road load spectrum as claimed in claim 1, wherein:

The rim connection tool (11) comprises a vertical mounting plate (13) with an isosceles trapezoid structure, a plurality of mounting holes for connecting a suspension (30) are formed in the vertical mounting plate (13), a transverse mounting plate (14) is connected to the bottom of the vertical mounting plate (13), and the actuator connection tool (12) is fixedly connected to the bottom of the transverse mounting plate (14).

3. A suspension system test stand based on road load spectrum as claimed in claim 2, wherein:

The two sides of the vertical mounting plate (13) are respectively provided with a triangular reinforcing rib (15) connected with the transverse mounting plate (14), the triangular reinforcing ribs (15) are respectively welded with the vertical mounting plate (13) and the transverse mounting plate (14), and the transverse mounting plate (14) is provided with a mounting hole for connecting the actuator with the tool (12).

4. A suspension system test stand based on road load spectrum as claimed in claim 2, wherein:

the actuator connecting tool (12) is of a rectangular cylinder structure, and threaded holes which are respectively connected with the transverse mounting plate (14), the vertical actuator (21), the transverse actuator (22) and the longitudinal actuator (23) are formed in the outer wall of the actuator connecting tool.

5. A suspension system test stand based on road load spectrum as claimed in claim 1, wherein:

The vertical actuator (21), the transverse actuator (22) and the longitudinal actuator (23) comprise loading actuators, a force transducer (24) connected to telescopic arms of the loading actuators, and a universal joint (25) connected with the force transducer (24), wherein the universal joint (25) is fixedly connected with the actuator connecting tool (12).

6. A suspension system test stand based on road load spectrum as claimed in claim 1, wherein:

The loading actuator (20) further comprises a controller for applying control signals to the vertical actuator (21), the lateral actuator (22) and the longitudinal actuator (23).

7. A method of testing a suspension system based on road load spectrum, the method comprising:

step 1, obtaining a reference road surface excitation signal and a test vehicle with a plurality of preset acquisition points, installing strain gauges on the preset acquisition points of the test vehicle, and performing a real vehicle test on the test vehicle under a road surface corresponding to the reference road surface excitation signal to obtain road spectrum data of the preset acquisition points of the test vehicle under the road surface;

step 2, under each group of road surfaces, respectively comparing road spectrum data acquired by all preset acquisition points of the test vehicle with a reference road surface excitation signal, finding road spectrum data with similarity smaller than a first preset threshold value with the reference road surface excitation signal, and taking the preset acquisition point corresponding to the road spectrum data as a target acquisition point corresponding to the group of road surfaces;

Step 3, installing a strain gauge at a target acquisition point of a vehicle to be tested, and performing a real-vehicle test on a test vehicle in a test field to obtain a load spectrum when road surface excitation is transmitted to the target acquisition point;

And 4, obtaining a transfer function from a loading point of the actuator to a load spectrum acquisition point through white noise, obtaining a primary test control signal from a load spectrum according to an inverse transfer function of the transfer function, performing multiple iterations by RPC software to obtain a final test control signal, and inputting the final test control signal to the suspension system test bench based on the road load spectrum according to any one of claims 1 to 6, so as to perform a bench test.

8. A method of testing a suspension system based on road load spectrum as defined by claim 7 wherein:

the reference road surface excitation signal is a continuous road surface excitation signal or a random road surface excitation signal, wherein the continuous road surface excitation signal is continuous excitation along the length direction of a road, and the random road surface excitation signal is intermittent excitation with impact effect.

9. The method of claim 7, wherein step 2 specifically comprises:

And when the absolute values of the difference values of A1 and B1 in the time domain signals of all the time domain signals on all the preset acquisition points of the test vehicle are smaller than a first preset threshold value, the similarity between the road spectrum data acquired by the preset acquisition points and the reference road surface excitation signal is high, and the preset acquisition points are selected as the corresponding target acquisition points of the group of roads.

10. The method of claim 7, wherein the step of obtaining the primary test control signal from the load spectrum according to an inverse transfer function of the transfer function comprises:

And obtaining a loading signal which is applied by the loading point of the actuator according to the inverse function of the transfer function, and dividing the loading signal into longitudinal, transverse and vertical primary test control signals.