A hydraulic simulation test bench for a semi-vehicle active suspension system

Abstract

The present invention discloses a hydraulic simulation test bench for a half-car active suspension system, comprising a half-car simulation bench, a half-car guide frame, a front hydraulic system simulation excitation platform, and a rear hydraulic system simulation excitation platform; the half-car simulation bench is supported on the front hydraulic system simulation excitation platform and the rear hydraulic system simulation excitation platform through front and rear wheels; the front hydraulic system simulation excitation platform and the rear hydraulic system simulation excitation platform are fixed to the bottom frame of the half-car guide frame through excitation platform fixing rods; the half-car simulation bench is installed in the bearing assembly component of the half-car guide frame through the two ends of the central axis, so as to realize the movement of the half-car simulation bench in the vertical direction and the pitch direction.

Description

Technical Field

[0001] The invention relates to a hydraulic simulation test bench for a semi-vehicle active suspension system, belonging to the field of mechanical equipment. Background Art

[0002] As the global commercial vehicle market transitions toward electrification, lightweighting, and intelligentization, suspension technology, as a key component of the chassis system, is also showing a clear trajectory of development in areas such as electronic control, lightweighting, and intelligentization. This development is primarily focused on electronic control technology and material technology. The development of electronic control technology is reflected in the transition from passive suspension technology to active suspension technology.

[0003] Active suspension, a rising new type of suspension system architecture, has been highly anticipated since its inception, compared to traditional passive and semi-active suspension systems. It utilizes additional active force generators (such as hydraulic, pneumatic, and electromagnetic actuators) to generate real-time torque to resist or absorb road disturbances, thereby achieving improved vibration damping performance. The rapid advancement of automotive electronics technology has enriched the functionality of electronic control unit modules, reduced the cost of sensors and controllers, and improved their accuracy. Advanced control algorithms developed for active suspension systems have further expanded the possibilities for enhancing their performance.

[0004] However, existing performance testing of active suspension system control methods often relies on a quarter-vehicle active suspension system test bench to verify the effectiveness of the proposed control method. However, this test bench only verifies the control effect of the proposed control method in the vertical direction of the vehicle's active suspension system, while ignoring the pitch motion generated during actual vehicle operation. Therefore, to better reflect the actual vehicle motion state, a half-vehicle active suspension system simulation test bench that takes into account both the pitch and vertical directions is designed. This is of great significance for the subsequent application of active suspension system control methods in actual vehicle active suspension systems. Summary of the Invention

[0005] The present invention provides a hydraulic simulation test bench for a half-vehicle active suspension system, which is used for verifying the vertical movement of a half-vehicle simulation bench and can also be used for verifying the movement in the pitch direction.

[0006] The technical solution of the present invention is: a hydraulic simulation test bench for a half-car active suspension system, comprising a half-car simulation bench 1, a half-car guide frame 2, a front hydraulic system simulation vibration platform 3, and a rear hydraulic system simulation vibration platform 4; the half-car simulation bench 1 is supported on the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 through the front and rear wheels 121; the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 are fixed on the bottom frame 202 of the half-car guide frame 2 through the vibration platform fixing rod 218; the half-car simulation bench 1 is installed in the bearing assembly component 204 of the half-car guide frame 2 through the two ends of the central axis 101, so as to realize the movement of the half-car simulation bench 1 in the vertical direction and the pitch direction.

[0007] The half-car simulation test bench 1 is a front-to-back symmetrical structure, including a carrier 103, two sets of wheel assemblies 120 arranged in a front-to-back symmetrical manner with the carrier 103, a swing arm assembly 130, a central axis 101, a bearing seat 102, a hydraulic cylinder upper hinge seat 104, a spring damper upper hinge seat 105, a swing arm bearing seat 106, a spring damper support beam 107, a hydraulic cylinder support beam 108, a spring damper 109, a hydraulic active cylinder 110, a spring The damper lower hinge seat 111 and the hydraulic cylinder lower hinge seat 112; the two groups have the same structure, taking one group as an example: the central axis 101 is fixed to the bearing seat 102; the bearing seat 102 is connected to the symmetric axis position of the carrier 103; the swing arm bearing seat 106 is fixed to the inner side of the lower end of the carrier 103, the spring damper support beam 107 and the hydraulic cylinder support beam 108 are connected to the carrier 103; the upper and lower ends of the spring damper 109 are respectively connected to the spring damper The upper hinge seat 105 is connected to the lower hinge seat 111 of the spring damper, the upper hinge seat 105 of the spring damper is fixed to the corresponding position of the spring damper support beam 107, and the lower hinge seat 111 of the spring damper is connected to the swing arm assembly 130; the upper and lower ends of the hydraulic cylinder of the hydraulic active cylinder 110 are respectively connected to the upper hinge seat 104 of the hydraulic cylinder and the lower hinge seat 112 of the hydraulic cylinder, and the upper hinge seat 104 of the hydraulic cylinder is fixed to the middle position of the hydraulic cylinder support beam 108. The lower hinge seat 112 of the pressure cylinder is connected to the swing arm assembly 130; one end of the swing arm assembly 130 rotates in coordination with the inner diameter of the swing arm bearing seat 106 fixed to the cargo rack 103 through the end of the swing arm shaft 131, and the wheel assembly 120 is installed at the other end of the swing arm assembly 130; the axes of the spring damper 109 and the hydraulic active cylinder 110, which are parallel to each other, are perpendicular to the axis of the wheel axle 123 in the wheel assembly 120, and the axis of the central axis 101 is parallel to the axis of the wheel axle 123.

[0008] The swing arm assembly 130 includes a swing arm shaft 131, a swing arm bearing 132, a swing arm cross beam 133, a spring damper swing arm support beam 134, a hydraulic cylinder swing arm support beam 135, a swing arm beam 136, and an angle seat 137; the swing arm shaft 131 is fixed to the swing arm bearing 132; the swing arm bearing 132 is connected to the upper end of the swing arm beam 136; the swing arm cross beam 133, the spring damper swing arm support beam 134, the hydraulic cylinder swing arm support beam 135, the swing arm beam 136, and the ... Beam 134, hydraulic cylinder swing arm support beam 135, wheel assembly 120, swing arm cross beam 133, spring damper swing arm support beam 134, hydraulic cylinder swing arm support beam 135 arranged from top to bottom in sequence, both ends of which are connected to the swing arm beam 136 through angle seats 137; the two spring damper lower articulated seats 111 are respectively connected to the two ends of the spring damper swing arm support beam 134; the hydraulic cylinder lower articulated seat 112 is connected to the middle position of the hydraulic cylinder swing arm support beam 135.

[0009] The wheel assembly 120 includes a wheel 121, a retaining frame 122, an axle 123, and a sleeve 124; the outer diameter of the axle 123 rotates in conjunction with the inner diameter of the wheel 121, and the sleeve 124 is installed between the wheel 121 and the retaining frame 122; both ends of the axle 123 are threaded and installed in the groove of the retaining frame 122 through nuts; the axis of the axle 123 is parallel to the center line of the swing arm shaft 131 in the swing arm assembly 130, and the entire wheel assembly 120 is connected to the end of the swing arm beam 136 in the swing arm assembly 130 by bolts passing through the through holes of the retaining frame 122.

[0010] The half-car guide frame 2 includes a guide frame vertical beam 201, a bottom frame 202, a rubber vibration damping pad 203, a bearing assembly 204, a linear guide rail 205, a guide frame upper crossbeam I 206, a guide frame angle piece 207, a linear guide rail fixing seat 208, a guide frame large angle piece 209, a guide frame upper crossbeam II 210, a guide frame middle crossbeam 211, a guide frame lower crossbeam angle piece 212, a guide frame lower crossbeam 213, a guide frame 45-degree reinforcement beam I 214, a guide frame 45-degree reinforcement beam II 215, a guide frame oblique reinforcement beam I 216, a guide frame oblique reinforcement beam II 217, an excitation platform excitation platform fixing rod 218, and an excitation platform fixing rod angle piece 219; the half-car guide frame 2 is made of aluminum alloy. The metal profile frame structure, one side of the upper end of the guide frame vertical beam 201 is connected to the guide frame upper crossbeam I 206 through the guide frame angle piece 207, and the other side of the upper end of the guide frame vertical beam 201 perpendicular to one side is connected to the guide frame upper crossbeam II 210 through the guide frame large angle piece 209, and the guide frame upper crossbeam I 206 and the guide frame upper crossbeam II 210 are arranged vertically; the two ends of the guide frame middle crossbeam 211 are respectively connected to the middle part of the two guide frame vertical beams 201 through the guide frame large angle piece 209, and the guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211 are arranged in parallel; the two ends of the linear guide rail 205 are respectively connected to the guide frame upper crossbeam II 210 and the guide frame middle crossbeam through the linear guide rail fixing seat 208 The guide frame is connected to the beam 211, the linear guide 205 is fixed to the linear guide fixing seat 208, and the linear guide fixing seat 208 is respectively connected to the corresponding guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211; the bearing assembly 204 cooperates with the vertically installed linear guide 205 to slide up and down; the guide frame lower crossbeam 213 arranged in parallel with the guide frame upper crossbeam I 206 is connected to the lower half of the two guide frame vertical beams 201 through the guide frame lower crossbeam angle 212; the guide frame oblique reinforcement beam I 216 and the guide frame oblique reinforcement beam II 217 are installed at a 90-degree angle between the two guide frame vertical beams 201 installed with the guide frame middle crossbeam 211 through the angle piece; the guide frame 45-degree The two ends of the reinforcing beam I 214 are respectively connected to the guide frame lower cross beam 213 and the bottom frame 202 through angle fittings; the two ends of the guide frame 45-degree reinforcing beam II 215 are respectively connected to the guide frame lower cross beam 213 and the bottom frame 202 through angle fittings, and the two sides of the guide frame lower cross beam 213 connected by the guide frame 45-degree reinforcing beam I 214 and the guide frame 45-degree reinforcing beam II 215 are two vertical sides; the vibration table fixing rod 218 is connected to the bottom frame 202 through the vibration table fixing rod angle fitting 219; the bottom end of the guide frame vertical beam 201 is connected to the bottom frame 202 through an angle fitting, and the bottom frame 202 as a whole is symmetrically placed on the rubber vibration damping pad 203 in the front and back and left and right directions.

[0011] The bearing assembly component 204 includes a slider 220, a cylindrical roller bearing 221, and a fixed block 222; the slider 220 cooperates with the vertically installed linear guide 205 to slide up and down, the cylindrical roller bearing 221 is installed in the through hole position of the fixed block 222, the slider 220 is connected to the internal thread of the fixed block 222, and the two ends of the central axis 101 are installed in the cylindrical roller bearing 221.

[0012] The front hydraulic system simulation excitation platform 3 and the rear hydraulic system simulation excitation platform 4 have the same structure and both include an upper rectangular tube frame 301, a guide shaft fixing seat 302, a guide shaft 303, a linear bearing 304, a vertical rectangular tube 305, an upper hinge seat 306 of the excitation cylinder, a buffer spring 307, a middle rectangular tube frame 308, a hydraulic excitation cylinder 309, a lower hinge seat 310 of the excitation cylinder, and a lower rectangular tube frame 311; the upper rectangular tube frame 301, the middle rectangular tube frame 308, and the lower rectangular tube frame 311 are arranged in an upper and lower manner, and the upper end of the lower rectangular tube frame 311 is connected to the lower end of the vertical rectangular tube 305, and the lower end of the middle rectangular tube frame 308 is connected to the upper end of the vertical rectangular tube 305; The lower end of the hydraulic excitation cylinder 309 is connected to the top center position of the lower rectangular tube frame 311 through the lower articulated seat 310 of the excitation cylinder, and the upper end of the hydraulic excitation cylinder 309 is connected to the bottom center position of the upper rectangular tube frame 301 through the upper articulated seat 306 of the excitation cylinder; the upper end of the guide shaft 303 is fixed to the bottom end of the upper rectangular tube frame 301 through the guide shaft fixing seat 302, and the lower end of the guide shaft 303 slides by cooperating with the linear bearing 304, the linear bearing 304 is connected to the middle rectangular tube frame 308, and the buffer spring 307 cooperates with the guide shaft 303 to be compressed and extended, and the buffer spring 307 is located between the bottom of the upper rectangular tube frame 301 and the top of the middle rectangular tube frame 308.

[0013] The beneficial effects of the present invention are:

[0014] This application mainly consists of four parts, including a half-car simulation test bench, a half-car guide frame, a front hydraulic system simulation vibration test bench, and a rear hydraulic system simulation vibration test bench. The half-car simulation test bench and the half-car guide frame are mainly constructed of aluminum alloy profiles. The aluminum alloy profiles are mostly connected by angle pieces, which facilitates the disassembly and assembly of the entire test bench. Furthermore, by flexibly using the groove structure of the aluminum alloy profile itself, such as the connection between the retaining frame and the swing arm beam in the wheel assembly, connections other than those between the aluminum alloy profiles are completed, avoiding drilling holes in the aluminum alloy profiles.

[0015] The front and rear hydraulic system simulation vibration platforms share identical structural designs. They primarily utilize a rectangular tubing frame structure, with the tubes primarily connected by welding to maximize the platform's strength. Furthermore, by drilling holes directly into the middle rectangular tubing frame, the linear bearings can be quickly and easily installed.

[0016] This application uses multiple linear guide rails. This design can meet the freedom requirements of the experimental table while reducing the mechanical friction of the experimental table as much as possible, facilitating daily maintenance and increasing the service life of the experimental table.

[0017] This application designs a bearing assembly component, which can realize the movement of the half-car simulation platform in the vertical direction (along the direction of the linear guide) and the pitch direction (the direction of rotation around the central axis) through the slider and cylindrical roller bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an assembly diagram of the present invention;

[0019] Figure 2 A schematic diagram of a half-car simulation test bench according to the present invention;

[0020] Figure 3 A partial schematic diagram of the half-car simulation platform of the present invention Figure 1 ;

[0021] Figure 4 A partial schematic diagram of the half-car simulation platform of the present invention Figure 2 ;

[0022] Figure 5 A partial schematic diagram of the half-car simulation platform of the present invention Figure 3 ;

[0023] Figure 6 This is a schematic diagram of a half-car guide frame of the present invention;

[0024] Figure 7 A partial schematic diagram of the half-car guide frame of the present invention Figure 1 ;

[0025] Figure 8 A partial schematic diagram of the half-car guide frame of the present invention Figure 2 ;

[0026] Figure 9 A partial schematic diagram of the half-car guide frame of the present invention Figure 3 ;

[0027] Figure 10 This is a schematic diagram of the bottom frame structure of the half-car guide frame of the present invention;

[0028] Figure 11 Schematic diagram of the hydraulic system simulation vibration table of the present invention;

[0029] Figure 12 A three-dimensional schematic diagram of a hydraulic system simulation vibration platform of the present invention;

[0030] Figure 13 Schematic diagram of the upper rectangular tube frame structure of the hydraulic system simulation excitation platform of the present invention;

[0031] Figure 14 Schematic diagram of the middle-layer rectangular tube frame structure of the hydraulic system simulation excitation platform of the present invention;

[0032] Figure 15 is a schematic diagram of a swing arm assembly of the present invention;

[0033] Figure 16 is a schematic diagram of a wheel assembly of the present invention;

[0034] Figure 17 is a schematic diagram of a bearing assembly component of the present invention;

[0035] The numbers in the figure are: 1-half-car simulation test bench, 2-half-car guide frame, 3-front hydraulic system simulation vibration test bench, 4-rear hydraulic system simulation vibration test bench, 101-center axis, 102-bearing seat, 103-carrying rack, 104-hydraulic cylinder upper hinge seat, 105-spring damper upper hinge seat, 106-swing arm bearing seat, 107-spring damper support beam, 108-hydraulic cylinder support beam, 109-spring damper, 110-hydraulic active Cylinder, 111-spring damper lower hinge seat, 112-hydraulic cylinder lower hinge seat, 130-swing arm assembly, 120-wheel assembly, 131-swing arm shaft, 132-swing arm bearing, 121-wheel, 122-cage, 123-sleeve, 124-axle, 201-guide frame vertical beam, 202-bottom frame, 203-rubber vibration damping pad, 204-bearing assembly, 205-linear guide rail, 206-guide frame upper beam I, 207-guide frame angle piece, 208-linear guide rail fixing seat, 209-guide frame large angle piece, 210-guide frame upper crossbeam Ⅱ, 211-guide frame middle crossbeam, 212-guide frame lower crossbeam angle piece, 213-guide frame lower crossbeam, 214-guide frame 45 degree reinforcement beam Ⅰ, 215-guide frame 45 degree reinforcement beam Ⅱ, 216-guide frame oblique reinforcement beam Ⅰ, 217-guide frame oblique reinforcement beam Ⅱ; 218-excitation table excitation table fixing rod, 21 9-vibration table fixing rod angle piece, 220-slider, 221-cylindrical roller bearing, 222-fixed block, 301-upper rectangular tube frame, 302-guide shaft fixing seat, 303-guide shaft, 304-linear bearing, 305-vertical rectangular tube, 306-excitation cylinder upper hinge seat, 307-buffer spring, 308-middle rectangular tube frame, 309-hydraulic excitation cylinder, 310-excitation cylinder lower hinge seat, 311-lower rectangular tube frame. DETAILED DESCRIPTION

[0036] The invention will be further described below with reference to the accompanying drawings and embodiments, but the content of the present invention is not limited to the scope of the drawings.

[0037] Example 1: Figure 1-17 As shown, a hydraulic simulation test bench for a half-car active suspension system includes a half-car simulation bench 1, a half-car guide frame 2, a front hydraulic system simulation vibration platform 3, and a rear hydraulic system simulation vibration platform 4; the half-car simulation bench 1 is supported on the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 through the front and rear wheels 121; the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 are fixed to the bottom frame 202 of the half-car guide frame 2 through the vibration platform fixing rod 218; the half-car simulation bench 1 is installed in the bearing assembly component 204 of the half-car guide frame 2 through the two ends of the central axis 101, so as to realize the movement of the half-car simulation bench 1 in the vertical direction and the pitch direction.

[0038] Optionally, the half-car simulation test bench 1 is a front-to-back symmetrical structure, including a carrier 103, two groups of wheel assemblies 120 arranged in a front-to-back symmetrical manner with the carrier 103, a swing arm assembly 130, a central axis 101, a bearing seat 102, an upper hinge seat 104 of a hydraulic cylinder, an upper hinge seat 105 of a spring damper, a swing arm bearing seat 106, a spring damper support beam 107, a hydraulic cylinder support beam 108, a spring damper 109, a hydraulic active cylinder 110, a spring damper lower hinge seat 111 and a hydraulic cylinder lower hinge seat 112. The two groups have the same structure. Take one group as an example: the central axis 101 is fixed to the bearing seat 102 by the fastening screws on the bearing seat 102; the bearing seat 102 is connected to the symmetrical axis position of the carrier 103 by bolts; the swing arm bearing seat 106 is fixed to the inner side of the lower end of the carrier 103 by bolts, the spring damper support beam 107 is fixed to the carrier 103 by bolts, the hydraulic cylinder support beam 108 is connected to the carrier 103 by bolts, and the spring damper support beam 107 is located on the inner side; the spring damper The upper and lower ends of 109 are connected to the spring damper upper hinge seat 105 and the spring damper lower hinge seat 111 respectively by bolts. The spring damper upper hinge seat 105 is fixed to the corresponding position of the spring damper support beam 107 by bolts. The spring damper lower hinge seat 111 is connected to the swing arm assembly 130 by bolts. The upper and lower ends of the hydraulic cylinder of the hydraulic active cylinder 110 are connected to the hydraulic cylinder upper hinge seat 104 and the hydraulic cylinder lower hinge seat 112 respectively by bolts. The hydraulic cylinder upper hinge seat 104 is fixed to the hydraulic cylinder by bolts. In the middle of the hydraulic cylinder support beam 108, the lower hinged seat 112 of the hydraulic cylinder is connected to the swing arm assembly 130 via bolts. One end of the swing arm assembly 130 rotates in conjunction with the inner diameter of the swing arm bearing seat 106 fixed to the load carrier 103 via the end of the swing arm shaft 131. The other end of the swing arm assembly 130 is mounted on the wheel assembly 120. The axes of the parallel spring damper 109 and the hydraulic active cylinder 110 are perpendicular to the axis of the wheel axle 123 in the wheel assembly 120, and the axis of the central axis 101 is parallel to the axis of the wheel axle 123. Furthermore, the installation of two spring dampers 109 mounted parallel to the hydraulic active cylinder can offset the impact force of the test bench during operation, better serving as auxiliary support.

[0039] Optionally, the swing arm assembly 130 includes a swing arm shaft 131, a swing arm bearing 132, a swing arm cross beam 133, a spring damper swing arm support beam 134, a hydraulic cylinder swing arm support beam 135, a swing arm beam 136, and an angle seat 137; the swing arm shaft 131 is fixed by a fastening screw of the swing arm bearing 132; the swing arm bearing 132 is connected to the upper end of the swing arm beam 136 by a bolt; the swing arm cross beam 133, the spring damper swing arm 134, the hydraulic cylinder swing arm support beam 135, the swing arm beam 136, and the angle seat 137 are fixed from one end of a group of inclined swing arm beams 136 to the other end. The support beam 134, hydraulic cylinder swing arm support beam 135, and wheel assembly 120, arranged in descending order, are connected from top to bottom to a swing arm crossbeam 133, a spring damper swing arm support beam 134, and a hydraulic cylinder swing arm support beam 135. Each end is connected to a swing arm beam 136 via angle brackets 137. The two spring damper lower hinged bases 111 are connected to the ends of the spring damper swing arm support beam 134 via bolts. The hydraulic cylinder lower hinged base 112 is connected to the middle of the hydraulic cylinder swing arm support beam 135 via bolts. The spring damper swing arm support beam 134 and the hydraulic cylinder swing arm support beam 135 are connected via an intermediate beam and angle brackets.

[0040] Optionally, the wheel assembly 120 includes a wheel 121, a retaining frame 122, an axle 123, and a sleeve 124; the outer diameter of the axle 123 rotates in conjunction with the inner diameter of the wheel 121, and the sleeve 124 is installed between the wheel 121 and the retaining frame 122; both ends of the axle 123 are threaded and installed in the groove of the retaining frame 122 through nuts; the axis of the axle 123 is parallel to the center line of the swing arm shaft 131 in the swing arm assembly 130, and the entire wheel assembly 120 is connected to the end of the swing arm beam 136 in the swing arm assembly 130 through bolts passing through the through hole of the retaining frame 122.

[0041] Optionally, the half-car guide frame 2 includes a guide frame vertical beam 201, a bottom frame 202, a rubber vibration damping pad 203, a bearing assembly 204, a linear guide rail 205, a guide frame upper crossbeam I 206, a guide frame angle piece 207, a linear guide rail fixing seat 208, a guide frame large angle piece 209, a guide frame upper crossbeam II 210, a guide frame middle crossbeam 211, a guide frame lower crossbeam angle piece 212, a guide frame lower crossbeam 213, a guide frame 45-degree reinforcement beam I 214, a guide frame 45-degree reinforcement beam II 215, a guide frame oblique reinforcement beam I 216, a guide frame oblique reinforcement beam II 217, an excitation platform excitation platform fixing rod 218, and an excitation platform fixing rod angle piece 219; the half-car guide frame 2 is an aluminum alloy profile frame structure, and the upper end of the guide frame vertical beam 201 is a The side of the guide frame is connected to the guide frame upper crossbeam I 206 through the guide frame angle piece 207, and the other side of the upper end of the guide frame vertical beam 201 is connected to the guide frame upper crossbeam II 210 through the guide frame large angle piece 209. The guide frame upper crossbeam I 206 and the guide frame upper crossbeam II 210 are arranged vertically; the two ends of the guide frame middle crossbeam 211 are respectively connected to the middle part of the two guide frame vertical beams 201 through the guide frame large angle piece 209, and the guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211 are arranged in parallel (the guide frame upper crossbeam I 206 and the guide frame lower crossbeam 213 are arranged in parallel, the guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211 are arranged in parallel, the guide frame upper crossbeam I 206, the guide frame lower crossbeam 213, the guide frame upper crossbeam II 210, The guide frame middle crossbeam 211 is perpendicular to the guide frame vertical beam 201, and the guide frame upper crossbeam I 206 and the guide frame upper crossbeam II 210 are perpendicular); the two ends of the linear guide rail 205 are connected to the guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211 respectively through the linear guide rail fixing seat 208, and the linear guide rail 205 is fixed to it through the fastening screws provided by the linear guide rail fixing seat 208, and the linear guide rail fixing seat 208 is connected to the corresponding guide frame upper crossbeam II 210 and the guide frame middle crossbeam 211 respectively through bolts; the bearing assembly component 204 cooperates with the vertically installed linear guide rail 205 to slide up and down; the guide frame lower crossbeam 213 arranged in parallel with the guide frame upper crossbeam I 206 is connected to the two guide frame vertical beams through the guide frame lower crossbeam angle piece 212 The lower half of the beam 201 is connected; the guide frame oblique reinforcement beam I 216 and the guide frame oblique reinforcement beam II 217 are installed at a ninety-degree angle between the two guide frame vertical beams 201 on which the guide frame middle crossbeam 211 is installed through angle fittings; the two ends of the guide frame 45-degree reinforcement beam I 214 are respectively connected to the guide frame lower crossbeam 213 and the bottom frame 202 through angle fittings; the two ends of the guide frame 45-degree reinforcement beam II 215 are respectively connected to the guide frame lower crossbeam 213 and the bottom frame 202 through angle fittings, and the two sides of the guide frame lower crossbeam 213 connected by the guide frame 45-degree reinforcement beam I 214 and the guide frame 45-degree reinforcement beam II 215 are two vertical sides; the excitation table excitation table fixing rod 218 is connected to the bottom frame 202 through the excitation table fixing rod angle fitting 219;The bottom end of the guide frame vertical beam 201 is connected to the bottom frame 202 via angle fittings. The bottom frame 202 is placed symmetrically front-to-back and left-to-right on rubber vibration damping pads 203. Furthermore, the guide frame vertical beam 201 is constructed of an 80mm x 40mm rectangular aluminum alloy profile. The 80mm side uses an 80mm angle fitting, also known as a large angle fitting; the 40mm side can only use a 40mm angle fitting.

[0042] Optionally, the bearing assembly component 204 includes a slider 220, a cylindrical roller bearing 221, and a fixed block 222; wherein the slider 220 cooperates with the vertically mounted linear guide 205 to slide up and down, the cylindrical roller bearing 221 is installed in the through hole position of the fixed block 222, the slider 220 is connected to the internal thread of the fixed block 222 by bolts, and both ends of the center shaft 101 are installed in the cylindrical roller bearing 221.

[0043] Optionally, the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 have the same structure, both including an upper rectangular tube frame 301, a guide shaft fixing seat 302, a guide shaft 303, a linear bearing 304, a vertical rectangular tube 305, an upper hinge seat 306 of the vibration cylinder, a buffer spring 307, a middle rectangular tube frame 308, a hydraulic vibration cylinder 309, a lower hinge seat 310 of the vibration cylinder, and a lower rectangular tube frame 311; the vibration platform as a whole is a frame structure of rectangular tubes welded together, the upper rectangular tube frame 301, the middle rectangular tube frame 308, and the lower rectangular tube frame 311 are arranged in an upper and lower manner, the upper end of the lower rectangular tube frame 311 is connected to the lower end of the vertical rectangular tube 305 by welding, and the lower end of the middle rectangular tube frame 308 is connected to the upper end of the vertical rectangular tube 305 by welding; the lower end of the hydraulic excitation cylinder 309 The end is connected to the top center position of the lower rectangular tube frame 311 through the lower hinge seat 310 of the excitation cylinder, and the upper end of the hydraulic excitation cylinder 309 is connected to the bottom center position of the upper rectangular tube frame 301 through the upper hinge seat 306 of the excitation cylinder; the upper end of the guide shaft 303 is fixed to the bottom end of the upper rectangular tube frame 301 through the guide shaft fixing seat 302, and the lower end of the guide shaft 303 slides by cooperating with the linear bearing 304, and the linear bearing 304 is connected to the middle rectangular tube frame 308. The buffer spring 307 cooperates with the guide shaft 303 to be compressed and extended, and the buffer spring 307 is located between the bottom of the upper rectangular tube frame 301 and the top of the middle rectangular tube frame 308 (the bottom end of the upper rectangular tube frame 301 is supported by the upper end of the buffer spring 307, and the lower end of the buffer spring 307 is supported by the upper end of the middle rectangular tube frame 308).

[0044] Furthermore, the following parameter calculation method is given:

[0045] The parameters of the hydraulic excitation cylinder 309 are as follows:

[0046] (1) Oil supply pressure

[0047] According to the requirements of the entire system, the oil supply pressure of the pump station in the electro-hydraulic servo system is preliminarily determined to be P S =12.5MPa. Take the load pressure as:

[0048]

[0049] (2) Determination of hydraulic excitation cylinder parameters

[0050] In mechanical system design, the maximum load position of the active actuator must coincide with the maximum load position in the entire load stroke. The effective area of ​​the hydraulic cylinder can be obtained according to the following formula:

[0051]

[0052] Where: F m is the maximum load force.

[0053] Take the mechanical efficiency of the excitation cylinder as η m =0.95, then the effective area of ​​the exciting cylinder is:

[0054]

[0055] P S =12.5MPa, F m =9500N Substituting into the formula, we get: A = 0.851×10 -3 m 2 When the push rod in the hydraulic cylinder is under pressure, the outer diameter of the piston push rod is:

[0056]

[0057] A=1.147×10 -3 m 2 Substituting into the equation, we get: D = 53.5. According to the recommended table of hydraulic cylinder working pressure and piston push rod outer diameter, after rounding, D = 50mm and d = 35mm. At this time, the effective working area of ​​the hydraulic cylinder is A = 1.001×10 -3 m 2 , which is slightly smaller than the estimated area, so the diameter is reduced. Take the diameter of the piston rod of the excitation cylinder as d = 28 mm, then A = 1.35 × 10 -3 m 2 , meeting the design requirements.

[0058] In summary, the dimensional parameters of the excitation cylinder designed in the present invention are shown in Table 1.

[0059] Table 1 Dimensional parameters of hydraulic excitation cylinder

[0060]

[0061] Referring to the design process of the excitation cylinder, the specific parameters of the hydraulic active cylinder 110 can be determined as shown in Table 2.

[0062] Table 2 Dimensional parameters of active cylinder

[0063]

[0064] The test bench in this invention has four hydraulic actuators: the front and rear suspension hydraulic actuators and the front and rear vibration platform hydraulic excitation cylinders. The hydraulic system utilizes a "one-to-two" design, with one hydraulic pump supplying oil to both hydraulic cylinders. The suspension hydraulic actuators and the vibration platform hydraulic actuators can operate independently. Therefore, the test bench's hydraulic system utilizes two electric motors, each driven by a coupling, to supply oil to each hydraulic cylinder. The two pump stations share a common oil tank and radiator.

[0065] The working principle of the present invention is:

[0066] The half-car simulation rig 1 is mounted on a cylindrical roller bearing 211 in the half-car guide frame 2 via a central axis 101 and supported on the surfaces of the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 via wheels 121. The front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 are fixed to the half-car guide frame 2 via vibration platform fixing rods 218. The hydraulic active cylinder 110 in the half-car simulation rig 1 and the hydraulic excitation cylinder 309 in the front hydraulic system simulation vibration platform 3 and the rear hydraulic system simulation vibration platform 4 are connected to an external electro-hydraulic servo valve and a pump station that provides oil pressure. The pump station includes an oil tank, a plunger pump, a three-phase asynchronous motor, a relief valve, and an air-cooled radiator.

[0067] During operation, the three-phase asynchronous motor and air-cooled radiator in the pump station are simultaneously activated, and the hydraulic excitation cylinders in the front / rear hydraulic system simulation excitation platform begin to reciprocate linearly up and down, achieving the random vibration required for the experiment, simulating the uneven road surface encountered by a vehicle during driving. Simultaneously, the hydraulic cylinders in the half-car simulation platform 1 also complete linear reciprocating motion. When the hydraulic excitation cylinders in the front / rear hydraulic system simulation excitation platform extend, their piston rods push the upper rectangular tubular frame 301 upward. Simultaneously, the guide shaft 303, acting as a guide, slides upward in conjunction with the linear bearing 304, and the buffer spring 307 extends. Furthermore, the upper rectangular tubular frame 301 pushes the wheel 121 in the swing arm assembly 130 upward, causing the hydraulic cylinder in the hydraulic master cylinder 110 to retract. When the hydraulic excitation cylinder in the front / rear hydraulic system simulates the contraction of the excitation table, the piston rod of the hydraulic excitation cylinder drives the upper rectangular tube frame 301 to move linearly downward. At the same time, the guide shaft 303 and the linear bearing 304 cooperate to slide downward, and the spring 307 that acts as a buffer contracts. Further, the wheel 121 in the swing arm assembly 130 produces a downward displacement under the action of neutral, and the hydraulic cylinder in the hydraulic active cylinder 110 extends.

[0068] When the piston rod in the hydraulic active cylinder 110 is extended, the carrier 103 connected to the upper hinge seat 104 of the hydraulic cylinder will make a linear motion upward along the linear guide rail 208 under the restriction of the bearing assembly 204, and the swing arm assembly 130 connected to the lower hinge seat 112 of the hydraulic cylinder will rotate downward in cooperation with the swing arm bearing seat 106 fixed on the carrier 103 through the swing arm shaft 131. At the same time, the spring damper parallel to the front and rear active hydraulic cylinders is extended; when the front and rear active hydraulic cylinders in the active hydraulic active cylinder 110 are retracted, the carrier 103 connected to the upper hinge seat 104 of the hydraulic cylinder will make a linear motion downward along the linear guide rail 208 under the restriction of the bearing assembly 204, and the swing arm assembly 130 connected to the lower hinge seat 112 of the hydraulic cylinder will rotate upward in cooperation with the swing arm bearing seat 106 fixed on the carrier 103 through the swing arm shaft 131. At the same time, the spring damper parallel to the hydraulic cylinder is retracted.

[0069] It should be noted that when the vibration amplitude of the front hydraulic system simulation vibration platform 3 is greater than that of the rear hydraulic system simulation vibration platform 4, the load carrier 103 of the half-car simulation platform 1 located above the hydraulic system simulation vibration platform will produce a deflection angle centered on the central axis 101, with the front higher and the rear lower. At this time, the extension of the front hydraulic cylinder in the hydraulic active cylinder 110 must be less than the extension of the rear hydraulic cylinder to maintain the horizontal state of the load carrier 103. When the vibration amplitude of the front hydraulic system simulation vibration platform 3 is less than the vibration amplitude of the rear hydraulic system simulation vibration platform 4, the load carrier 103 of the half-car simulation platform 1 located above the hydraulic system simulation vibration platform will produce a deflection angle centered on the central axis 101, with the front lower and the rear higher. The extension of the front hydraulic cylinder in the hydraulic active cylinder 110 must be greater than the extension of the rear hydraulic cylinder to maintain the horizontal state of the load carrier 103. The above completes the motion simulation of this half-car active suspension system hydraulic simulation test bench in the vertical and pitch directions.

[0070] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the scope of the present invention.

Claims

1. A hydraulic simulation test bench for a semi-vehicle active suspension system, characterized by: The invention comprises a half-car simulation platform (1), a half-car guide frame (2), a front hydraulic system simulation vibration platform (3), and a rear hydraulic system simulation vibration platform (4); the half-car simulation platform (1) is supported on the front hydraulic system simulation vibration platform (3) and the rear hydraulic system simulation vibration platform (4) through front and rear wheels (121); the front hydraulic system simulation vibration platform (3) and the rear hydraulic system simulation vibration platform (4) are fixed to the bottom frame (202) of the half-car guide frame (2) through a vibration platform fixing rod (218); the half-car simulation platform (1) is installed in the bearing assembly component (204) of the half-car guide frame (2) through both ends of the central axis (101), so as to realize the movement of the half-car simulation platform (1) in the vertical direction and the pitch direction; The half-car simulation platform (1) has a front-to-back symmetrical structure, comprising a carrier (103), two groups of wheel assemblies (120) arranged in a front-to-back symmetrical manner with the carrier (103), a swing arm assembly (130), a central shaft (101), a bearing seat (102), a hydraulic cylinder upper hinge seat (104), a spring damper upper hinge seat (105), a swing arm bearing seat (106), a spring damper support beam (107), a hydraulic cylinder support beam (108), a spring damper (109), a hydraulic active cylinder (110), a spring damper lower The hinge seat (111) and the lower hinge seat (112) of the hydraulic cylinder are identical in structure. Take one of the two groups as an example: the central axis (101) is fixed to the bearing seat (102); the bearing seat (102) is connected to the symmetric axis position of the carrier (103); the swing arm bearing seat (106) is fixed to the inner side of the lower end of the carrier (103); the spring damper support beam (107) and the hydraulic cylinder support beam (108) are connected to the carrier (103); the spring damper (109) and the hydraulic active cylinder (110) are arranged in parallel, and the spring damper (109) and the hydraulic active cylinder (110) are arranged in parallel. 09) The upper and lower ends are respectively connected to the spring damper upper hinge seat (105) and the spring damper lower hinge seat (111), the spring damper upper hinge seat (105) is fixed to the corresponding position of the spring damper support beam (107), and the spring damper lower hinge seat (111) is connected to the swing arm assembly (130); the upper and lower ends of the hydraulic cylinder of the hydraulic active cylinder (110) are respectively connected to the hydraulic cylinder upper hinge seat (104) and the hydraulic cylinder lower hinge seat (112), and the hydraulic cylinder upper hinge seat (104) is fixed to the middle of the hydraulic cylinder support beam (108). Position, the lower hinge seat (112) of the hydraulic cylinder is connected to the swing arm assembly (130); one end of the swing arm assembly (130) rotates in conjunction with the inner diameter of the swing arm bearing seat (106) fixed to the carrier (103) through the end of the swing arm shaft (131), and the other end of the swing arm assembly (130) is installed with the wheel assembly (120); the axes of the spring damper (109) and the hydraulic active cylinder (110) which are parallel to each other are perpendicular to the axis of the wheel axle (123) in the wheel assembly (120), and the axis of the central axis (101) is parallel to the axis of the wheel axle (123); The swing arm assembly (130) includes a swing arm shaft (131), a swing arm bearing (132), a swing arm crossbeam (133), a spring damper swing arm support beam (134), a hydraulic cylinder swing arm support beam (135), a swing arm beam (136), and an angle seat (137); the swing arm shaft (131) is fixed to the swing arm bearing (132); the swing arm bearing (132) is connected to the upper end of the swing arm beam (136); the swing arm crossbeam (133), the spring damper swing arm, and the hydraulic cylinder swing arm support beam (135) are fixed from one end to the other end of a group of inclined swing arm beams (136). The support beam (134), the hydraulic cylinder swing arm support beam (135), the wheel assembly (120), the swing arm cross beam (133), the spring damper swing arm support beam (134), and the hydraulic cylinder swing arm support beam (135) are arranged in sequence from top to bottom, and both ends are connected to the swing arm beam (136) through angle seats (137); the two spring damper lower hinge seats (111) are respectively connected to the two ends of the spring damper swing arm support beam (134); the hydraulic cylinder lower hinge seat (112) is connected to the middle position of the hydraulic cylinder swing arm support beam (135); The bearing assembly component (204) includes a slider (220), a cylindrical roller bearing (221), and a fixed block (222); wherein the slider (220) cooperates with a vertically mounted linear guide rail (205) to slide up and down, the cylindrical roller bearing (221) is mounted at a through-hole position of the fixed block (222), the slider (220) and the fixed block (222) are internally threadedly connected, and both ends of the central axis (101) are mounted in the cylindrical roller bearing (221); the axis of the cylindrical roller bearing (221) is arranged perpendicular to the linear guide rail (205).

2. The hydraulic simulation test bench for the semi-vehicle active suspension system according to claim 1 is characterized in that: The wheel assembly (120) includes a wheel (121), a retaining frame (122), a wheel axle (123), and a shaft sleeve (124); the outer diameter of the wheel axle (123) rotates in conjunction with the inner diameter of the wheel (121), and the shaft sleeve (124) is installed between the wheel (121) and the retaining frame (122); both ends of the wheel axle (123) are threaded and are installed in the groove of the retaining frame (122) through nuts; the axis of the wheel axle (123) is parallel to the center line of the swing arm shaft (131) in the swing arm assembly (130), and the entire wheel assembly (120) is connected to the end of the swing arm beam (136) in the swing arm assembly (130) through bolts passing through the through holes of the retaining frame (122).

3. The hydraulic simulation test bench for the semi-vehicle active suspension system according to claim 1 is characterized in that: The half-car guide frame (2) includes a guide frame vertical beam (201), a bottom frame (202), a rubber vibration damping pad (203), a bearing assembly (204), a linear guide rail (205), a guide frame upper crossbeam I (206), a guide frame angle piece (207), a linear guide rail fixing seat (208), a guide frame large angle piece (209), a guide frame upper crossbeam II (210), a guide frame middle crossbeam (211), a guide frame lower crossbeam angle piece (212), a guide frame lower crossbeam (213), a guide frame 45-degree reinforcement beam I (214), a guide frame 45-degree reinforcement beam II (215), a guide frame oblique reinforcement beam I (216), a guide frame oblique reinforcement beam II (217), an excitation table excitation table fixing rod (218), an excitation table excitation table fixing rod (219), an excitation table fixing rod (220), an excitation table fixing rod (221), an excitation table fixing rod (222), an excitation table fixing rod (223), an excitation table fixing rod (224), an excitation table fixing rod (225), an excitation table fixing rod (226), an excitation table fixing rod (227), an excitation table fixing rod (228), an excitation table fixing rod (229), an excitation table fixing rod (229), an excitation table fixing rod (230), an excitation table fixing rod (231), an excitation table fixing rod (232), an excitation table fixing rod (233), an excitation table fixing rod (234), an excitation table fixing rod (235), an excitation table fixing rod (236), an excitation table fixing rod (237), an excitation table fixing rod (238), an excitation table fixing rod (239), an excitation table fixing rod (239), an excitation table fixing rod (231), an excitation table fixing rod (231), an excitation table fixing rod (23 The platform fixing rod angle piece (219); the half-car guide frame (2) is an aluminum alloy profile frame structure, one side of the upper end of the guide frame vertical beam (201) is connected to the guide frame upper crossbeam I (206) through the guide frame angle piece (207), the other side of the upper end of the guide frame vertical beam (201) perpendicular to one side is connected to the guide frame upper crossbeam II (210) through the guide frame large angle piece (209), the guide frame upper crossbeam I (206) and the guide frame upper crossbeam II (210) are arranged vertically; the two ends of the guide frame middle crossbeam (211) are respectively connected to the middle part of the two guide frame vertical beams (201) through the guide frame large angle piece (209), the guide frame upper crossbeam II (210) and the guide frame middle crossbeam (211) are arranged in parallel; the linear guide rail (20 5) are connected to the guide frame upper crossbeam II (210) and the guide frame middle crossbeam (211) through the linear guide rail fixing seat (208), the linear guide rail (205) is fixed to the linear guide rail fixing seat (208), and the linear guide rail fixing seat (208) is connected to the corresponding guide frame upper crossbeam II (210) and the guide frame middle crossbeam (211); the bearing assembly (204) cooperates with the vertically installed linear guide rail (205) to slide up and down; the guide frame lower crossbeam (213) arranged in parallel with the guide frame upper crossbeam I (206) is connected to the lower half of the two guide frame vertical beams (201) through the guide frame lower crossbeam angle piece (212); the guide frame oblique reinforcement beam I (216) and the guide frame oblique reinforcement beam II ( 217) is installed at a ninety-degree angle between two guide frame vertical beams (201) of the guide frame middle beam (211) through angle pieces; the two ends of the guide frame 45-degree reinforcement beam I (214) are connected to the guide frame lower cross beam (213) and the bottom frame (202) through angle pieces respectively; the two ends of the guide frame 45-degree reinforcement beam II (215) are connected to the guide frame lower cross beam (213) and the bottom frame (202) through angle pieces respectively, and the two sides of the guide frame lower cross beam (213) connected by the guide frame 45-degree reinforcement beam I (214) and the guide frame 45-degree reinforcement beam II (215) are two vertical sides; the excitation platform excitation platform fixing rod (218) is connected to the bottom frame (202) through the excitation platform fixing rod angle piece (219);The bottom end of the guide frame vertical beam (201) is connected to the bottom frame (202) through an angle piece, and the bottom frame (202) is placed on the rubber vibration damping pad (203) in a symmetrical manner in front and back and left and right directions.

4. The hydraulic simulation test bench for the semi-vehicle active suspension system according to claim 1 is characterized by: The front hydraulic system simulation excitation platform (3) and the rear hydraulic system simulation excitation platform (4) have the same structure, and both include an upper rectangular tube frame (301), a guide shaft fixing seat (302), a guide shaft (303), a linear bearing (304), a vertical rectangular tube (305), an upper hinge seat (306) of an excitation cylinder, a buffer spring (307), a middle rectangular tube frame (308), a hydraulic excitation cylinder (309), a lower hinge seat (310) of an excitation cylinder, and a lower rectangular tube frame (311); the upper rectangular tube frame (301), the middle rectangular tube frame (308), and the lower rectangular tube frame (311) are arranged in an upper and lower manner, the upper end of the lower rectangular tube frame (311) is connected to the lower end of the vertical rectangular tube (305), and the lower end of the middle rectangular tube frame (308) is connected to the upper end of the vertical rectangular tube (305). The lower end of the hydraulic excitation cylinder (309) is connected to the top center position of the lower rectangular tube frame (311) through the lower excitation cylinder hinge seat (310), and the upper end of the hydraulic excitation cylinder (309) is connected to the bottom center position of the upper rectangular tube frame (301) through the upper excitation cylinder hinge seat (306); the upper end of the guide shaft (303) is fixed to the bottom end of the upper rectangular tube frame (301) through the guide shaft fixing seat (302), and the lower end of the guide shaft (303) slides by cooperating with the linear bearing (304), and the linear bearing (304) is connected to the middle rectangular tube frame (308). The buffer spring (307) cooperates with the guide shaft (303) to be compressed and extended, and the buffer spring (307) is located between the bottom of the upper rectangular tube frame (301) and the top of the middle rectangular tube frame (308).

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