A rigid body modal testing device and testing method for an engine anti-torsion pull rod mount

Abstract

The present invention provides a rigid body mode testing device and a testing method for an engine anti-torsion pull rod mount, including a separately provided pressing module and a stretching module; the pressing module includes a pressing cover plate and a pressing base, and the pressing cover plate is detachably installed on the top of the pressing base; the stretching module includes a longitudinal adjustment master plate, a longitudinal adjustment slave plate and a stretching slider; the longitudinal adjustment slave plate is installed inside the longitudinal adjustment master plate, and its vertical installation position inside the longitudinal adjustment master plate is adjustable; a stretching slider is installed on the longitudinal adjustment slave plate, and its installation position on the longitudinal adjustment slave plate is adjustable. The rigid body mode testing device for the engine anti-torsion pull rod mount of the present invention can apply tensile forces of different magnitudes on a test bench device to simulate the deformation state of the mount rubber under different working conditions of a vehicle, so as to accurately and efficiently test its rigid body mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration and noise control, and particularly relates to a rigid body mode testing device and a testing method for an engine anti-torsion tie rod mount. Background Art

[0002] In recent years, the NVH (Noise, Vibration, and Harshness) performance of automobiles has received increasing attention and has gradually become an important factor when consumers purchase automobiles. The engine is the power source of the vehicle and also the main source of noise and vibration. Since the engine and the vehicle body are connected by multiple mounts, the vibration isolation design of the mounts is very important. If the design is improper, the excitation force of the engine cannot be effectively isolated, and it will be transmitted to various structures of the vehicle, generating obvious noise and vibration, thereby affecting the comfort of drivers and passengers; even worse, it will damage the main components and cause durability and safety problems.

[0003] Currently, common family cars, SUVs (Sports Utility Vehicles), and MPVs (Multi-Purpose Vehicles) mostly adopt a pendulum-type three-point mount structure, in which the rear mount is an anti-torsion tie rod mount, which has a simple structure and low cost, and can effectively isolate vibration transmission and limit the displacement of the engine. If the design is unreasonable, the rigid body mode of the anti-torsion tie rod mount will be coupled with the subframe mode during vehicle acceleration, generating serious noise and vibration. Obviously, during the early-stage mount selection and design, the rigid body mode of the anti-torsion tie rod mount needs to be considered key. However, existing methods are all tested in a vehicle stationary state and cannot simulate the state where the mount rubber deforms under force during actual acceleration, resulting in the rigid body mode frequency of the tested mount not conforming to the actual situation. Summary of the Invention

[0004] In view of this, the present invention aims to provide a rigid body mode testing device for an engine anti-torsion tie rod mount to overcome the defects of the prior art, which can apply different magnitudes of tensile forces on a bench device to simulate the deformation state of the mount rubber under different working conditions of the vehicle, thereby accurately and efficiently testing its rigid body mode.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A rigid body mode testing device for an engine anti-torsion tie rod mount includes an independently arranged pressing module and a stretching module;

[0007] The pressing module includes a pressing cover plate and a pressing base, and the pressing cover plate is detachably installed on the top of the pressing base;

[0008] The stretching module includes a longitudinal adjustment mother board, a longitudinal adjustment sub-board and a stretching slider; the longitudinal adjustment sub-board is installed inside the longitudinal adjustment mother board, and its vertical installation position inside the longitudinal adjustment mother board is adjustable; the stretching slider is installed on the longitudinal adjustment sub-board, and its installation position on the longitudinal adjustment sub-board is adjustable.

[0009] Further, the pressing base includes a first mounting plate, a support plate and a suspension positioning rod; the first mounting plate is provided with a support plate, and the suspension positioning rod is installed on the support plate.

[0010] Further, the pressing cover plate is sleeved on the suspension positioning rod, and both ends of it are connected to the support plate through fasteners;

[0011] Preferably, the first mounting plate is rigidly connected to the support plate, and the support plate is rigidly connected to the suspension positioning rod.

[0012] Further, the longitudinal adjustment mother board includes a second mounting plate and two chute plates parallelly installed on the second mounting plate; a first positioning through-hole groove is opened on one side of each of the two chute plates facing the pressing module, and a card slot is opened on one side of the two chute plates facing each other.

[0013] Further, the longitudinal adjustment sub-board is composed of an "H-shaped" support plate, a stretching slider groove and a spiral adjustment shaft; the "H-shaped" support plate is installed between the two chute plates, and its vertical installation position relative to the two chute plates is adjustable; the stretching slider groove is installed on the "H-shaped" support plate, and the spiral adjustment shaft is installed in the stretching slider groove;

[0014] Preferably, the "H-shaped" support plate is rigidly connected to the stretching slider groove.

[0015] Further, the "H-shaped" support plate is matched with the card slots of the two chute plates through the vertical plates on both sides, and the "H-shaped" support plate and the two chute plates can be tightly connected through the fasteners installed in the first positioning through-hole grooves;

[0016] Preferably, the horizontal plate in the middle of the "H-shaped" support plate is arranged parallel to the horizontal plane.

[0017] Further, the stretching slider groove is a shell with an open bottom and front side, a hollow interior and an open middle at the top; second positioning through-hole grooves are opened on both sides of the top of the stretching slider groove, and the second positioning through-hole grooves are arranged parallel to the spiral adjustment shaft;

[0018] Preferably, a displacement pointer is also installed on the upper surface of the top of the stretching slider groove.

[0019] Further, the screw adjustment shaft includes an adjustment crank and a threaded rod; the threaded rod is located inside the stretching slider groove, and one end thereof away from the pressing module extends out of the stretching slider groove and is connected to the adjustment crank located outside the stretching slider groove.

[0020] Further, the stretching slider includes a slider base and a stretching head; the stretching head is detachably connected to the upper end of the slider base, the lower end of the slider base is engaged inside the stretching slider groove, and the smooth surfaces of the two are in contact; the lower end of the slider base is sleeved on the screw adjustment shaft, and the two are threadedly connected; a displacement scale is also installed at the lower end of the slider base;

[0021] Preferably, the slider base is in an inverted T shape;

[0022] More preferably, the lower end of the slider base is in a two-stage stepped shape. The stepped part at the lower end is engaged inside the stretching chute, and a positioning screw hole for fastening with the stretching chute is provided on its upper surface; the stepped part at the upper end is engaged in the open part in the middle of the top of the stretching chute, and the displacement scale is provided on the upper surface of the stepped part at the upper end;

[0023] Further preferably, a tension sensor is detachably connected between the upper end of the slider base and the stretching head.

[0024] Another object of the present invention is to propose a method for performing a rigid body mode test on an engine anti-torsion tie rod mount using the rigid body mode test device for an engine anti-torsion tie rod mount as described above to test the rigid body mode of the engine anti-torsion tie rod mount.

[0025] A method for testing the rigid body mode of an engine anti-torsion tie rod mount includes the step of sample installation:

[0026] 1) Fix the pressing module and the stretching module on the special iron floor for modal testing;

[0027] 2) Pass the large-size end of the anti-torsion tie rod mount through the mount positioning rod and place it on the support plate. The positioning through hole in the middle of the pressing cover passes through the mount positioning rod, and then fix the pressing cover to the support plate;

[0028] 3) Fix and connect the small-size end stretching head of the anti-torsion tie rod mount, and then:

[0029] During the tension test, connect and install a tension sensor between the stretching head and the slider base;

[0030] During the displacement test, the stretching head is directly connected to the slider base.

[0031] Preferably, the method for testing the rigid body mode of the engine anti-torsion tie rod mount further includes the step of position adjustment:

[0032] S1: Adjust the longitudinal adjustment sub - plate of the up - and - down adjustment and stretching module to make the horizontal angle of the torsion - resistant tie - rod suspension the same as the vehicle - mounted angle, and fix the longitudinal adjustment sub - plate;

[0033] S2: Manually shake the adjustment crank to drive the threaded rod to rotate and adjust the horizontal stretching position. The control of the position is as follows:

[0034] If the rubber deformation amount is known, the adjustment process controls the required displacement amount through the displacement scale and the displacement pointer 2222;

[0035] If the tensile force is known, the position is controlled through the value of the tensile force sensor;

[0036] S3: After the adjustment is in place, fix the position of the stretching slider to ensure sufficient horizontal stretching stiffness.

[0037] Preferably, the test method for the rigid - body mode of the engine torsion - resistant tie - rod suspension further includes the step of performing the rigid - body mode test.

[0038] Compared with the prior art, the rigid - body mode test device for an engine torsion - resistant tie - rod suspension of the present invention has the following advantages:

[0039] 1. It can simulate the deformation state of the rubber main spring of the torsion - resistant tie - rod suspension under different vehicle conditions, and the modal test results are more real, fast, and effective;

[0040] 2. It can match suspensions with various different shapes, sizes, and installation angles, and has strong versatility;

[0041] 3. While obtaining the modal results, it integrates displacement measurement and tensile force measurement, and conducts a more comprehensive study on the torsion - resistant tie - rod suspension.

[0042] The advantages of the test method for the rigid - body mode of the engine torsion - resistant tie - rod suspension of the present invention compared with the prior art are basically the same as those of the above - mentioned rigid - body mode test device for the engine torsion - resistant tie - rod suspension, and will not be elaborated here. Brief Description of the Drawings

[0043] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0044] Figure 1 is a schematic structural diagram of the rigid - body mode test device for the engine torsion - resistant tie - rod suspension of the present invention at one angle;

[0045] Figure 2 is a schematic structural diagram of the rigid - body mode test device for the engine torsion - resistant tie - rod suspension of the present invention at another angle;

[0046] Figure 3Schematic diagram of the pressing module structure;

[0047] Figure 4 Schematic diagram of the stretching module structure;

[0048] Figure 5 Schematic diagram of the longitudinal adjustment master plate structure;

[0049] Figure 6 Schematic three-dimensional structure diagram of the longitudinal adjustment sub-plate;

[0050] Figure 7 Schematic top view structure diagram of the longitudinal adjustment sub-plate;

[0051] Figure 8 Schematic diagram of the stretching slider structure;

[0052] Figure 9 Schematic diagram of the installation of the suspension sample.

[0053] Explanation of the reference numerals in the drawings:

[0054] 1 - Pressing module; 11 - Pressing cover plate; 111 - Locating rod through-hole; 112 - Bolt through-hole; 12 - Pressing base; 121 - First mounting plate; 122 - Support plate; 123 - Suspension locating rod; 2 - Stretching module; 21 - Longitudinal adjustment master plate; 211 - Second mounting plate; 212 - Slide groove plate; 213 - First positioning through-hole groove; 22 - Longitudinal adjustment sub-plate; 221 - "H-shaped" support plate; 222 - Stretching slider groove; 2221 - Second positioning through-hole groove; 2222 - Displacement pointer; 223 - Screw adjustment shaft; 2231 - Adjusting crank; 2232 - Threaded rod; 23 - Stretching slider; 231 - Slider base; 232 - Tensile force sensor; 233 - Stretching head; 234 - Displacement scale; 235 - Positioning screw hole; 236 - Threaded through-hole; 3 - Anti-torsion rod suspension. Detailed implementation manners

[0055] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0058] A rigid body mode testing device for an engine anti-torsion tie rod mount according to the present invention includes two independent modules, namely a pressing module 1 and a stretching module 2, as Figure 1 、 2 shown. When these two independent modules are used, they can be fixed on a dedicated iron floor using anchor bolts or splints.

[0059] The specific structures of the pressing module and the stretching module are as follows:

[0060] As Figure 3As shown in the figure, the pressing module is composed of a pressing cover plate 11 and a pressing base 12, and the pressing cover plate 11 is detachably installed on the top of the pressing base 12. Specifically: a positioning rod through-hole 111 is provided in the middle of the pressing cover plate 11, and two bolt through-holes 112 are provided at both ends. The pressing base 12 is composed of a first mounting plate 121, a support plate 122, and a suspension positioning rod 123. A support plate 122 is provided on the first mounting plate 121, and a suspension positioning rod 123 is installed on the support plate 122. Screw holes are opened at both ends of the top of the support plate 122. As a preferred connection method, the first mounting plate 121 is rigidly connected to the support plate 122, and the suspension positioning rod 123 is rigidly connected to the support plate 122 at the middle position of the upper end of the support plate 122. When in use, the pressing cover plate 11 can be sleeved on the positioning rod through-hole 111, and then bolts are inserted into the bolt through-holes 112 or screw holes on the same side of the pressing cover plate 11 and the pressing base and tightened to tightly connect the two.

[0061] As Figure 4 shown in the figure, the stretching module 2 is composed of a longitudinal adjustment mother board 21, a longitudinal adjustment son board 22, and a stretching slider 23. The longitudinal adjustment son board 22 is installed in the longitudinal adjustment mother board 21, and its up and down installation positions in the longitudinal adjustment mother board 21 are adjustable; the stretching slider 23 is installed on the longitudinal adjustment son board 22, and its installation position on the longitudinal adjustment son board 22 is adjustable.

[0062] As Figure 5 shown in the figure, as an optional implementation manner of the present invention, the longitudinal adjustment mother board 21 is composed of a second mounting plate 211, two chute plates 212, and a first positioning through-hole groove 213. Among them, the two chute plates 212 are installed on the second mounting plate 211 in parallel. Specifically in terms of the installation method, the chute plate 212 and the second mounting plate 211 can preferably be rigidly connected. A card slot is opened on the inner side of the chute plate 212, and a first positioning through-hole groove 213 is opened on the outer side. More specifically, a card slot is opened on each of the opposite sides of the two chute plates 212, and a first positioning through-hole groove 213 is opened on each of the sides of the two chute plates 212 facing the pressing module 1 in the use state.

[0063] As Figure 6 and Figure 7As shown, as an optional embodiment of the present invention, the longitudinal adjustment sub-plate 22 is composed of an "H-shaped" support plate 221, a stretching slider groove 222, and a spiral adjustment shaft 223. The "H-shaped" support plate 221 is installed between two chute plates 212, and its vertical installation position relative to the two chute plates 212 is adjustable. Specifically, the "H-shaped" support plate 221 is in clamping groove fit with the chute plates 212 through the clamping plates on both sides (the "H-shaped" support plate 221 is composed of two parallel vertical plates and a horizontal plate provided between them. Therefore, the clamping plates here are the vertical plates of the "H-shaped" structure). Here, the clamping plates of the "H-shaped" support plate 221 can be connected to the clamping grooves of the chute plates 212 where they are located through smooth surfaces or clearance connections, as long as it is ensured that the two can move relatively up and down, so that the longitudinal adjustment sub-plate 22 can slide up and down within the longitudinal adjustment mother-plate 21. At the same time, the "H-shaped" support plate 221 and the two chute plates 212 can be fixedly connected through fasteners to fix the vertical installation positions of the two chute plates 212 in the clamping grooves of the "H-shaped" support plate 221. Specifically, bolts are used to pass through the first positioning through-hole grooves 213 corresponding in position and cooperate with the positioning screw holes 2211 on the sides of the "H-shaped" support plate to fix the vertical position of the longitudinal adjustment sub-plate 22. For the connection method between the stretching slider groove 222 and the "H-shaped" support plate 221, a rigid connection can be preferably used. As an optional embodiment of the present invention, the stretching slider groove 222 is a housing with an open bottom and front side (i.e., the side facing the pressing module), a hollow interior, and an open middle at the top. In order to facilitate the fixation of the stretching slider, second positioning through-hole grooves 2221 are opened on both sides of the top of the stretching slider groove 222. At the same time, in order to cooperate with the subsequent displacement scale 234 to read the displacement of the stretching slider 23, a displacement pointer 2222 is also installed on the upper surface of the top of the stretching slider groove 222. The installation method of the displacement pointer 2222 is preferably welding. The spiral adjustment shaft 223 is arranged parallel to the second positioning through-hole grooves 2221 and the open part in the middle of the top of the stretching slider groove 222. As an optional embodiment of the present invention, the spiral adjustment shaft 223 includes an adjustment crank 2231 and a threaded rod 2232; the threaded rod 2232 is located inside the stretching slider groove 222 and is at the central position of the stretching slider groove 222. One end of it faces the open part on the front side of the stretching slider groove 222, and the other end is far from the pressing module 1, and the end far from the pressing module 1 passes through and extends out of the stretching slider groove 222 and is connected to the adjustment crank 2231 located outside the stretching slider groove 222 (it can be a threaded connection).

[0064] As Figure 8As shown in the figure, as an alternative embodiment of the present invention, the stretching slider 23 includes a slider base 231 and a stretching head 233. The stretching head 233 is detachably connected to the upper end of the slider base 231. The lower end of the slider base 231 is engaged inside the stretching slider groove 222, and the smooth surfaces of the two are in contact. Specifically, the detachable connection method between the stretching head 233 and the slider base 231 can be a threaded connection. The slider base 231 is in an inverted "T" shape. The lower end of the slider base 231 is in a two-stage stepped shape. The stepped part at the lower end is engaged inside the stretching chute 222, and a positioning screw hole 235 for fastening with the stretching chute 222 is provided on its upper surface. The stepped part at the upper end is engaged in the open part in the middle of the top of the stretching chute 222, and the displacement scale 234 is provided on the upper surface of the stepped part at the upper end. A threaded through hole 236 perpendicular to the positioning screw hole 235 is also opened at the lower end of the slider base 231. One end of the threaded rod 2232 of the screw adjustment shaft 223 passes through the threaded through hole 236. The threaded through hole 236 is in threaded cooperation with the screw adjustment shaft 223. The screw adjustment shaft 223 is fixed at one end of the stretching slider groove 222. By rotating the adjustment handle 2231 on the outside of the screw adjustment shaft 223, the displacement between the stretching slider 23 and the stretching slider groove 222 can be realized, and further, the precise manual horizontal adjustment of the stretching slider 23 in the stretching slider groove can be realized. And the horizontal position is fixed by passing a bolt through the positioning hole groove 2221 and the positioning screw hole 235 to ensure sufficient stretching stiffness.

[0065] The stretching slider groove 222 is designed with a displacement pointer 2222. There is a displacement scale 234 on the slider base 231 of the stretching slider 23. When the stretching slider 23 moves horizontally inside the stretching slider groove 222 to generate displacement, the displacement amount of the stretching slider 23 can be read through the displacement pointer 2222 and the displacement scale 234.

[0066] As an alternative embodiment of the present invention, a tensile force sensor 232 can also be detachably connected between the stretching head 233 and the slider base 231 on the stretching slider 23 by a detachable connection method such as a threaded connection. When testing the tensile force, it is connected to the slider base 231 and the stretching head 233 through the stud on the tensile force sensor 232. If testing the stretching displacement amount, the stretching head 233 can be directly connected to the slider base.

[0067] In terms of structural design, the stretching head 233 can be adjusted in the longitudinal and horizontal directions to match more types of mounts.

[0068] A rigid body modal testing method for an engine anti-torsion pull rod mount of the present invention includes the following steps:

[0069] 1. Specimen installation:

[0070] 1) Fix the pressing module 1 and the stretching module 2 on the special iron floor for modal testing;

[0071] 2) Suspend the large-size end of the torsional resistance rod mount (i.e., the vehicle body side) through the suspension positioning rod 123 and place it on the support plate 122. Press the positioning through-hole 111 in the middle of the pressing cover plate 11 through the suspension positioning rod 123, and then use bolts to pass through the bolt through-holes 112 at both ends of the pressing cover plate 11 and tighten and fix them with the screw holes on the support plate 122;

[0072] 3) Fix the small-size end of the torsional resistance rod mount (i.e., the engine side) to the stretching head 233 on the stretching slider 23 through nuts and bolts. During the tensile test, install and connect the tensile force sensor 232 between the stretching head 233 and the slider base 231; during the displacement test, the stretching head 233 is directly connected to the slider base 231.

[0073] See the installation schematic diagram of the mount sample in Figure 9 。

[0074] 2. Position adjustment:

[0075] 1) After installation, adjust the longitudinal adjustment sub-plate 22 of the stretching module 2 up and down to make the horizontal angle of the torsional resistance rod mount the same as the vehicle-mounted angle, and use bolts to fix the longitudinal adjustment sub-plate through the first positioning through-hole groove 213 and the positioning screw hole 2211;

[0076] 2) Manually shake the adjustment crank 2231 to drive the threaded rod 2232 to rotate and adjust the horizontal stretching position. If the rubber deformation amount is known, the required displacement amount is controlled through the displacement scale 234 and the displacement pointer 2222 during the adjustment process; if the tensile force is known, the position is controlled through the value of the tensile force sensor 232. After adjustment, use bolts to fix the position of the stretching slider through the second positioning through-hole groove 2221 and the positioning screw hole 235 to ensure sufficient horizontal stretching stiffness.

[0077] 3. Conduct modal testing.

[0078] The following describes the method for testing the rigid body mode of the engine torsional resistance rod mount using the rigid body mode testing device for the engine torsional resistance rod mount according to the present invention in combination with specific embodiments.

[0079] Embodiment 1

[0080] It is known that the rubber displacement of a certain car's torsional resistance rod mount under the full-throttle acceleration condition in the third gear is 9.5 mm. To test the rigid body mode under this condition, the test steps are as follows:

[0081] 1. Fix and install the pressing module and the stretching module on the special test iron floor respectively;

[0082] 2. Use the pressing cover plate to fixedly install the large-size end of the torsional resistance rod mount on the pressing base;

[0083] 3. Remove the tension sensor on the stretching slider and connect the small-sized end of the torsion-resistant pull rod suspension to the stretching slider;

[0084] 4. Adjust the longitudinal adjustment sub-board of the stretching module up and down to make the horizontal angle of the suspension the same as the vehicle-mounted angle (5° in this example), and then fix the longitudinal adjustment sub-board with bolts;

[0085] 5. Manually adjust the crank to adjust the horizontal stretching displacement to 9.5 mm;

[0086] 6. Arrange 6 acceleration sensors on the torsion-resistant pull rod suspension and draw a geometric model;

[0087] 7. Move the force hammer and strike each measuring point respectively to obtain the corresponding transfer function;

[0088] 8. Calculate the rigid body mode of the torsion-resistant pull rod suspension, and the test results are shown in Table 1.

[0089] Table 1 Rigid body mode test results of the torsion-resistant pull rod suspension in Example 1

[0090]

[0091]

[0092] Example 2

[0093] It is known that the tension received by the torsion-resistant pull rod suspension of a certain SUV vehicle under the full-throttle acceleration condition in the third gear is 3361 N. Test the rigid body mode under this condition, and the test steps are as follows:

[0094] 1. Fix and install the pressing module and the stretching module on the special test iron floor respectively;

[0095] 2. Use the pressing cover plate to fixedly install the large-sized end of the torsion-resistant pull rod suspension on the pressing base;

[0096] 3. Install a tension sensor on the stretching slider and connect the small-sized end of the torsion-resistant pull rod suspension to the stretching slider;

[0097] 4. Adjust the longitudinal adjustment sub-board of the stretching module up and down to make the horizontal angle of the suspension the same as the vehicle-mounted angle (6° in this example), and then fix the longitudinal adjustment sub-board with bolts;

[0098] 5. Manually adjust the crank to adjust the tension to 3361 N;

[0099] 6. Arrange 6 acceleration sensors on the torsion-resistant pull rod suspension and draw a geometric model;

[0100] 7. Move the force hammer and strike each measuring point respectively to obtain the corresponding transfer function;

[0101] 8. Calculate the rigid body modes of the anti-torsion tie rod mounts, and the test results are shown in Table 2.

[0102] Table 2 Rigid body mode test results of the anti-torsion tie rod mounts in Example 2

[0103] Serial number Frequency (Hz) Vibration mode 1 92 Rotation about Y axis 2 134 Rotation about X axis 3 229 Translation in Y direction 4 194 Rotation about Z axis 5 388 Translation in X direction 6 560 Translation in Z direction

[0104] It should be noted that:

[0105] Drawing geometric models, obtaining transfer functions, etc. in Example 1 and Example 2 are all well-known contents in the art and are not the key points protected by the present invention.

[0106] The displacement sensors described in the present invention are all commercially available ordinary displacement sensors.

[0107] The coordinate systems in all the drawings of the present invention are the general coordinate systems on the vehicle, and the X, Y, and Z axes in the test results of Example 1 and Example 2 are also the X, Y, and Z axes in the general coordinate system on the vehicle.

[0108] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rigid body modal testing device for an engine anti-torsion tie rod mount, characterized in that: it includes a separately arranged pressing module (1) and a stretching module (2); the pressing module (1) includes a pressing cover plate (11) and a pressing base (12), and the pressing cover plate (11) is detachably installed on the top of the pressing base (12); the stretching module (2) includes a longitudinal adjustment master plate (21), a longitudinal adjustment slave plate (22) and a stretching slider (23); the longitudinal adjustment slave plate (22) is installed in the longitudinal adjustment master plate (21), and its vertical installation position in the longitudinal adjustment master plate (21) is adjustable; a stretching slider (23) is installed on the longitudinal adjustment slave plate (22), and its installation position on the longitudinal adjustment slave plate (22) is adjustable; the pressing base (12) includes a first mounting plate (121), a support plate (122) and a mount positioning rod (123); a support plate (122) is provided on the first mounting plate (121), and a mount positioning rod (123) is installed on the support plate (122); the longitudinal adjustment master plate (21) includes a second mounting plate (211) and two chute plates (212) mounted in parallel on the second mounting plate (211); a first positioning through-hole groove (213) is opened on one side of each of the two chute plates (212) facing the pressing module (1), and a card slot is opened on one side of the two chute plates (212) facing each other; the longitudinal adjustment slave plate (22) is composed of an "H-shaped" support plate (221), a stretching slider groove (222) and a screw adjustment shaft (223); the "H-shaped" support plate (221) is installed between the two chute plates (212), and its vertical installation position relative to the two chute plates (212) is adjustable; the stretching slider groove (222) is installed on the "H-shaped" support plate (221), and a screw adjustment shaft (223) is installed in the stretching slider groove (222); the screw adjustment shaft (223) includes an adjustment crank (2231) and a threaded rod (2232); the threaded rod (2232) is located inside the stretching slider groove (222), and its end away from the pressing module (1) extends out of the stretching slider groove (222) and is connected to the adjustment crank (2231) located outside the stretching slider groove (222); the stretching slider (23) includes a slider base (231) and a stretching head (233); the stretching head (233) is detachably connected to the upper end of the slider base (231), the lower end of the slider base (231) is clamped inside the stretching slider groove (222), and the two are in smooth surface contact; the lower end of the slider base (231) is sleeved on the screw adjustment shaft (223), and the two are threadedly connected; a displacement scale (234) is also installed at the lower end of the slider base (231); During testing, the large-sized end of the anti-torsion pull rod mount is passed through the mount positioning rod (123) and placed on the support plate (122). The positioning through-hole (111) in the middle of the pressing cover plate (11) is pressed to pass through the mount positioning rod (123), and then the pressing cover plate (11) is fixed to the support plate (122); the small-sized end of the anti-torsion pull rod mount is fixedly connected to the stretching head (233).

2. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: The pressing cover plate (11) is sleeved on the mount positioning rod (123), and both ends thereof are connected to the support plate (122) through fasteners.

3. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 2, characterized in that: The first mounting plate (121) is rigidly connected to the support plate (122), and the support plate (122) is rigidly connected to the mount positioning rod (123).

4. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: The "H-shaped" support plate (221) is rigidly connected to the stretching slider groove (222).

5. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: The "H-shaped" support plate (221) is engaged with the clamping grooves of the two chute plates (212) through the vertical plates on both sides, and the "H-shaped" support plate (221) and the two chute plates (212) can be tightly connected through the fasteners installed in the first positioning through-hole groove (213).

6. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 5, characterized in that: The horizontal plate in the middle of the "H-shaped" support plate (221) is arranged parallel to the horizontal plane.

7. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 5, characterized in that: The stretching slider groove (222) is a shell with an open bottom and front side, a hollow interior, and an open middle at the top; both sides of the top of the stretching slider groove (222) are provided with a second positioning through-hole groove (2221), and the second positioning through-hole groove (2221) is arranged parallel to the screw adjustment shaft (223).

8. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 7, characterized in that: A displacement pointer (2222) is further installed on the upper surface of the top of the stretching slider groove (222).

9. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: The slider base (231) is in an inverted T shape.

10. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: The lower end of the slider base (231) is in a two-stage stepped shape. The stepped part at the lower end is engaged inside the stretching chute (222), and a positioning screw hole (235) for fastening to the stretching chute (222) is provided on its upper surface; the stepped part at the upper end is engaged in the open middle part at the top of the stretching chute (222), and the displacement scale (234) is provided on the upper surface of the stepped part at the upper end. ​ 11. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 1, characterized in that: A tension sensor (232) is detachably connected between the upper end of the slider base (231) and the tension head (233).

12. A method for rigid body modal testing of an engine anti-torsion pull rod mount using the rigid body modal testing device for an engine anti-torsion pull rod mount according to any one of claims 1-11, characterized in that: It includes the steps of sample installation: 1) Fix the pressing module (1) and the stretching module (2) on the special iron floor for modal testing; 2) Pass the large-size end of the anti-torsion pull rod mount through the mount positioning rod (123) and place it on the support plate (122). The central positioning through-hole (111) of the pressing cover plate (11) passes through the mount positioning rod (123), and then fix the pressing cover plate (11) and the support plate (122); 3) Fix the small-size end of the anti-torsion pull rod mount to the tension head (233). Subsequently, during the tension test, connect and install the tension sensor (232) between the tension head (233) and the slider base (231); During the displacement test, the tension head (233) is directly connected to the slider base (231).

13. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 12, characterized in that: It further includes the step of position adjustment: S1: Vertically adjust the longitudinal adjustment sub-plate (22) of the stretching module (2) to make the horizontal angle of the anti-torsion pull rod mount the same as the vehicle-mounted angle, and fix the longitudinal adjustment sub-plate; S2: Manually shake the adjustment crank (2231) to drive the threaded rod (2232) to rotate and adjust the horizontal stretching position. The control of the position: If the rubber deformation amount is known, the required displacement amount is controlled through the displacement scale (234) and the displacement pointer 2222 during the adjustment process; If the tension is known, the position is controlled through the value of the tension sensor (232); S3: After the adjustment is in place, fix the position of the stretching slider to ensure sufficient horizontal stretching stiffness.

14. The rigid body modal testing device for the engine anti-torsion pull rod mount according to claim 13, characterized in that: It further includes the step of performing rigid body modal testing.

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