A weathering test system for abnormal vibration testing

Abstract

This invention provides a weathering test system for abnormal noise and vibration testing, comprising an environmental chamber and an abnormal noise testing device. The environmental chamber includes a base and a housing, with a conditioning chamber formed inside the housing. The base has a mounting surface located below the conditioning chamber, and an isolation chamber recessed relative to the mounting surface. The isolation chamber is separated from the conditioning chamber by an insulation plate. The abnormal noise testing device includes a drive mechanism, a transmission mechanism, and a support mechanism. The drive mechanism includes a vibrator, which is disposed in the isolation chamber. The transmission mechanism and the support mechanism are disposed above the mounting surface. This invention separates different parts of the abnormal noise testing device by setting up a conditioning chamber and an isolation chamber. The mechanical transmission mechanism and the support mechanism are placed in the conditioning chamber, while the electrical drive mechanism is placed in the isolation chamber. This satisfies the requirements of weathering testing while ensuring the operational stability of the vibrator.

Description

Technical Field

[0001] This invention relates to the field of vehicle abnormal noise detection technology, and more specifically to a weathering test system for abnormal noise vibration testing. Background Technology

[0002] With the rapid development of the automotive industry and new energy, users have increasingly higher requirements for vehicle comfort. Vehicle noise is one of the important factors affecting the user's driving experience. Automakers need to conduct component noise and vibration tests during vehicle research and development to determine whether there are any abnormal noises in the components.

[0003] Conventional component noise and vibration tests are conducted at room temperature. However, the actual operating environment of automobiles includes extreme high and low temperatures. Some components that pass the noise and vibration test at room temperature may exhibit abnormal noises at high and low temperatures. Therefore, extreme environment testing of vehicle components is essential. Component noise testing benches typically include a drive mechanism, a transmission mechanism, and a movable platform. The drive mechanism is connected to the movable platform through the transmission mechanism, causing the movable platform to vibrate and simulate the vehicle's driving conditions. For example, patent application number CN202410080685.9 discloses a vehicle noise detection platform, which includes a static platform, a moving platform, and four branch kinematic chains. The four branch kinematic chains are driven by hydraulic cylinders or hydraulic motors to cause the moving platform to vibrate. When detecting abnormal noise, an excitation force is generally required. In abnormal noise tests, there are some multi-degree-of-freedom compound motions, which require multiple excitation forces to be combined. The stability of the excitation force is required to be high. However, high and low temperatures will affect the working stability and service life of the power mechanism. In the above technical solution, the drive mechanism is integrated into the branch kinematic chain. When conducting weather resistance tests, the entire equipment needs to be placed in a high and low temperature environment. The drive mechanism will inevitably be affected by high and low temperatures, which is not conducive to the implementation of weather resistance tests. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a weathering test system for abnormal noise and vibration testing. This test system ensures the operational stability of the drive mechanism during weathering testing, thereby guaranteeing the smooth conduct of the abnormal noise and vibration test.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A weathering test system for abnormal noise vibration testing includes an environmental chamber and an abnormal noise testing device. The environmental chamber includes a base and a housing placed on top of the base. An conditioned chamber is formed inside the housing. The base has a mounting surface located below the conditioned chamber. The base has an isolation chamber recessed relative to the mounting surface. The isolation chamber is separated from the conditioned chamber by an insulation plate, which has a perforation connecting the isolation chamber and the conditioned chamber. The abnormal noise testing device includes a drive mechanism, a transmission mechanism, and a load-bearing mechanism. The drive mechanism includes a vibrator and a pull rod connected to the vibrator. The vibrator is disposed in the isolation chamber. The pull rod passes through the perforation and its upper end extends... Extending to the temperature control chamber, the transmission mechanism and the supporting mechanism are positioned above the mounting base. The supporting mechanism includes a support base and a movable platform, which are connected by an elastic connector. The movable platform is provided with a transmission docking part. The transmission mechanism includes a first positioning base, a main transmission component, and a connecting rod. The main transmission component includes a first base, a driving arm, and a transmission arm. The first base is hinged to the first positioning base. The driving arm and the transmission arm are connected to the first base. The end of the driving arm forms a driving end that can be connected to the pull rod. The end of the transmission arm forms a transmission end. The two ends of the connecting rod can be connected to the transmission end and the transmission docking part, respectively.

[0007] Furthermore, the power transmission arm includes a first power transmission arm extending in the x direction and a second power transmission arm extending in the y direction. The ends of the first power transmission arm and the second power arm respectively form a first transmission end and a second transmission end. The first transmission end has a first connection hole that can be arranged in the z direction, and the second transmission end has a second connection hole that can be arranged in the x direction.

[0008] It should be noted that in this invention, the power transmission arm will move under the drive arm, which will cause the orientation of the connection hole on the transmission end to change to a certain extent. "Can be set in the z direction" means that when the first power transmission arm moves to a certain position, the opening direction of the first connection hole can be exactly in the z direction. "Can be set in the x direction" and "Can be set in the y direction" are similar.

[0009] Furthermore, the transmission mechanism also includes a second positioning seat and a secondary transmission component. The secondary transmission component includes a second base, a third transmission arm, and a fourth transmission arm. The second base is hinged to the second positioning seat. The ends of the third transmission arm and the fourth transmission arm respectively form a third transmission end and a fourth transmission end. The third transmission end has a third connection hole that can be arranged in the z-direction, and the fourth transmission end has a fourth connection hole that can be arranged in the y-direction. The first connection hole and the fourth connection hole are axially corresponding.

[0010] Furthermore, the end of the first transmission arm has an upper branch and a lower branch, and the first transmission end includes an upper end located on the upper branch and a lower end located on the lower branch. The upper end and the lower end respectively have an upper connecting hole that can be arranged in the z-direction and a lower connecting hole that can be arranged in the z-direction. The lower connecting hole corresponds to the fourth connecting hole in the axial direction.

[0011] Furthermore, the elastic connector includes a spring sheet and a first connecting portion and a second connecting portion disposed at both ends of the spring sheet, the support base is provided with a first mounting portion corresponding to the first connecting portion, and the movable platform is provided with a second mounting portion corresponding to the second connecting portion.

[0012] Furthermore, the first mounting part is provided with a first mounting surface, a second mounting surface and a third mounting surface, the second mounting part is provided with a first corresponding surface, a second corresponding surface and a third corresponding surface, the first mounting surface and the first corresponding surface form a first mounting position that allows the spring to face the z direction, the second mounting surface and the second corresponding surface form a second mounting position that allows the spring to face the x direction, and the third mounting surface and the third corresponding surface form a third mounting position that allows the spring to face the y direction.

[0013] Furthermore, the temperature-regulating chamber is connected to a first temperature control device, and the temperature-isolated chamber is connected to a second temperature control device.

[0014] Furthermore, the movable platform has an x-axis side, a y-axis side, and a z-axis side. The z-axis side is provided with a first transmission docking part, the x-axis side is provided with a second transmission docking part, and the y-axis side is provided with a third transmission docking part.

[0015] Furthermore, the movable platform has one x-axis side, one z-axis side, and two y-axis sides. The z-axis side is provided with two first transmission docking parts, the x-axis side is provided with two second transmission docking parts, and each y-axis side is provided with a third transmission docking part. The transmission mechanism includes two transmission groups, each transmission group includes a main transmission component and a secondary transmission component, and each main transmission component corresponds to a vibrator.

[0016] The following beneficial effects can be achieved by applying this invention:

[0017] 1. This invention separates different parts of the abnormal noise testing equipment by setting up an adjustment chamber and an isolation chamber. The transmission mechanism and bearing mechanism of the mechanical part are placed in the adjustment chamber, so that the automotive parts under test can be exposed to the high and low temperature environment of the adjustment chamber. The drive mechanism of the electrical part is placed in the isolation chamber and separated from the adjustment chamber by a heat insulation plate, so that the vibrator is not affected by the extreme environment in the adjustment chamber and the working stability of the vibrator is guaranteed.

[0018] 2. This invention utilizes the lever principle for transmission. In some embodiments, only one exciter is needed to provide excitation force in the x, y, or z directions to the movable table through the main transmission component and the auxiliary transmission component, thereby achieving multi-directional abnormal noise testing. The structure is ingenious and has a low failure rate.

[0019] 3. The transmission mechanism of the present invention applies excitation force to the movable table through the connecting rod. The installation and disassembly of the connecting rod are simple, the switching efficiency of the test mode is high, and it can quickly complete the multi-directional abnormal noise detection of automotive parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the weathering test system used for abnormal vibration testing in the embodiment;

[0021] Figure 2 for Figure 1 A partial structural diagram of the transmission mechanism;

[0022] Figure 3 for Figure 1 Schematic diagram of the load-bearing mechanism;

[0023] Figure 4 This is a schematic diagram of the structure of the elastic connector in the embodiment;

[0024] Figure 5 This is a schematic diagram illustrating three installation methods for the elastic connector in the embodiment;

[0025] Figure 6 This is a schematic diagram of the structure of the movable platform in the embodiment;

[0026] In the picture:

[0027] 1-Base platform, 11-Insulation chamber, 12-Insulation board;

[0028] 2-Box body, 21-Controlled temperature chamber;

[0029] 3-Drive mechanism;

[0030] 4-Transmission mechanism, 41-Main transmission component, 411-First base, 412-Driving arm, 4121-Driving end, 413-First transmission arm, 4131-Upper end, 4132-Lower end, 414-Second transmission arm, 4141-Second transmission end, 42-First positioning seat, 43-Secondary transmission component, 431-Second base, 432-Third transmission arm, 4321-Third transmission end, 433-Fourth transmission arm, 4331-Fourth transmission end, 44-Second positioning seat, 45-Connecting rod;

[0031] 5-Bearing mechanism, 51-Support base, 511-First mounting part, 5111-First mounting surface, 5112-Second mounting surface, 5113-Third mounting surface, 52-Moveable platform, 521-Second mounting part, 5211-First corresponding surface, 5212-Second corresponding surface, 5213-Third corresponding surface, 522-Z-direction side, 5221-First transmission docking part, 523-X-direction side, 5231-Second transmission docking part, 524-Y-direction side, 5241-Third transmission docking part, 53-Elastic connector, 531-Spring piece, 532-First connecting part, 533-Second connecting part, 53a-First mounting position, 53b-Second mounting position, 53c-Third mounting position. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that the x, y, and z directions described in this invention are based on a three-dimensional rectangular coordinate system, and the x, y, and z directions are perpendicular to each other. The description of the x, y, and z directions in this invention is only used to indicate the relative positional relationship between different technical features, and does not limit the absolute position of the technical features. Example

[0034] Reference Figures 1-6 This invention provides a weathering test system for abnormal noise vibration testing, comprising an environmental chamber and an abnormal noise testing device. The environmental chamber includes a base 1 and a housing 2 placed above the base. The abnormal noise testing device includes a drive mechanism 3, a transmission mechanism 4, and a load-bearing mechanism 5. Specifically:

[0035] The enclosure 2 forms an adjustment chamber 21 inside. In the working state, the environmental chamber is connected to a temperature regulation device to simulate a high temperature or low temperature environment in the adjustment chamber. The base 1 has a mounting base surface located on the lower side of the adjustment chamber for placing abnormal noise testing equipment. A certain area of ​​the base is provided with an isolation chamber 11 that is recessed relative to the mounting base surface. An insulation board 12 is provided in the isolation chamber. The insulation board includes a side plate covering the side wall of the isolation chamber and a top plate that basically closes the upper opening of the isolation chamber. The top plate makes the isolation chamber and the adjustment chamber two relatively independent areas. A perforation in the middle of the top plate allows the isolation chamber and the adjustment chamber to communicate.

[0036] The drive mechanism 3 includes a vibrator and a pull rod connected to the vibrator;

[0037] The supporting mechanism 5 includes a support base 51 and a movable platform 52 connected to the support base via an elastic connector 53. The movable platform is generally a cuboid structure. The support base includes four first mounting portions 511, each having a first mounting surface 5111 facing the z-direction, a second mounting surface 5112 facing the x-direction, and a third mounting surface 5113 facing the y-direction. A second mounting portion 521 is provided at each of the four corners of the movable platform. Each second mounting portion includes a first corresponding surface 5211 corresponding to the position of the first mounting surface, a second corresponding surface 5212 corresponding to the second mounting surface, and a third corresponding surface 5213 corresponding to the third mounting surface. The elastic connector includes a spring piece 531 and a first connecting portion 532 and a second connecting portion 533 respectively disposed at both ends of the spring piece. The first connecting portion can be fixedly connected to the first mounting portion via the first mounting surface, the second mounting surface, or the third mounting surface. The second connecting portion can be fixedly connected to the second mounting portion via the first mating surface, the second mating surface, or the third mating surface. Figure 5 The elastic connector has three installation methods. The first installation position 53a formed by the first mounting surface and the first mating surface allows the elastic connector to be installed with the spring facing the z-direction. The second installation position 53b formed by the second mounting surface and the second mating surface allows the elastic connector to be installed with the spring facing the x-direction. The third installation position 53c formed by the third mounting surface and the third mating surface allows the elastic connector to be installed with the spring facing the y-direction. The thickness direction of the spring is its own facing direction. Under size constraints, the spring can only bend in the direction perpendicular to its own thickness, so that the movable table can only vibrate in one of the x, y, and z directions after the spring is installed, which facilitates the implementation of abnormal noise tests. The movable table also includes a z-direction side 522, an x-direction side 523, and a y-direction side 524. The z-direction side, x-direction side, and y-direction side are respectively provided with a first transmission docking part 5221, a second transmission docking part 5231, and a third transmission docking part 5241.

[0038] The transmission mechanism 4 includes a main transmission component 41, a first positioning seat 42, a secondary transmission component 43, a second positioning seat 44, and a connecting rod 45. The main transmission component 41 includes a first base 411, a driving arm 412 connected to the first base and extending in a first direction (x-axis), a first transmission arm 413 connected to the first base and extending in a second direction (x-axis), and a second transmission arm 414 connected to the first base and extending in the z-axis. The first base 411 is hinged to the first positioning seat and is upper-limited in the y-axis, so that the main transmission component can only move in the xz plane. The driving force... The arm extends above the perforation and its end forms a drive end that can be connected to the pull rod. The first transmission arm extends below the z-direction side of the movable platform, and the end of the first transmission arm forms a first transmission end. More specifically, the end of the first transmission arm has upper and lower branches. The first transmission end includes an upper end 4131 located on the upper branch and a lower end 4132 located on the lower branch. The upper end and the lower end have an upper connection hole and a lower connection hole respectively that can be arranged in the z-direction. The upper end can be connected to the first transmission docking part 5221 through a connecting rod arranged in the z-direction. The second transmission arm extends to a position near the x-direction side, and the end of the second transmission arm forms a second transmission end. The second transmission end has a second connection hole that can be arranged in the x-direction. The second transmission end can be connected to the second transmission docking part 5231 through a connecting rod arranged in the x-direction. The auxiliary transmission member 43 includes a second base 431, a third transmission arm 432 connected to the second base and extending in the y-direction, and a fourth transmission arm 433 connected to the second base and extending in the z-direction. The second base is hinged to the second positioning seat 44 and is upper-positioned in the x-direction, so that the auxiliary transmission member 43... The transmission component can only move in the yz plane. The third transmission arm extends below the lower end and forms a third transmission end 4321 at its end. The third transmission end has a third connection hole that can be arranged in the z direction. The third transmission end can be connected to the lower end through a connecting rod. The fourth transmission arm extends to a position close to the y-direction side and forms a fourth transmission end 4331 at its end. The fourth transmission end has a fourth connection hole that can be arranged in the y direction. The fourth transmission end can be connected to the third transmission docking part 5241 through a connecting rod.

[0039] The working principle of this embodiment is as follows: The vibrator is placed in the insulated chamber and faces upwards. The upper end of the pull rod passes through the perforation in the middle of the top plate and extends into the adjustment chamber. The transmission mechanism and the bearing mechanism are placed on the mounting base. The transmission mechanism is connected to the part of the pull rod that extends into the adjustment chamber. When an x-direction excitation force needs to be applied, the second transmission arm is connected to the second transmission docking part through a connecting rod. An excitation force is applied to the drive arm through the vibrator and the pull rod. The lever principle is used to drive the end of the second transmission arm to vibrate in the x-direction, thereby applying an x-direction excitation force to the movable table through the connecting rod. When a y-direction excitation force needs to be applied, the first transmission arm and the third transmission arm are connected through a connecting rod. Next, the fourth transmission arm is connected to the third transmission docking part via a connecting rod. A vibration force is applied to the drive arm via a vibrator and a pull rod, causing the end of the first transmission arm to vibrate in the z-direction. This, in turn, causes the third transmission arm to vibrate in the z-direction. Simultaneously, the fourth transmission arm vibrates in the y-direction when the third transmission arm vibrates in the z-direction, thus applying a y-direction vibration force to the movable platform via the connecting rod. When a z-direction vibration force is required, the first transmission arm is connected to the first transmission docking part via a connecting rod. A vibration force is applied to the drive arm via a vibrator and a pull rod, causing the end of the first transmission arm to vibrate in the z-direction, thus applying a z-direction vibration force to the movable platform via the connecting rod. During weathering tests, the connection method of the transmission mechanism is first adjusted according to the test requirements. After adjustment, the temperature in the conditioning chamber is brought to the preset value using a temperature control device. Then, the vibrator is started to conduct the abnormal noise test.

[0040] In the abnormal noise testing equipment of this invention, only the drive mechanism contains electrical equipment, while the transmission mechanism and the load-bearing mechanism are both mechanical parts. The transmission mechanism and the load-bearing mechanism, exposed to the extreme environment of the conditioning chamber, will not significantly interfere with the test. The vibrator, which is susceptible to temperature interference, is separately housed in an isolation chamber and isolated from the conditioning chamber by an insulation plate. The isolation chamber is less affected by temperature changes in the conditioning chamber, allowing the vibrator to maintain a relatively stable working state, thus ensuring the smooth conduct of the weathering test. In this invention, the drive mechanism, transmission mechanism, and load-bearing mechanism of the abnormal noise testing equipment are integrated inside the housing, making installation relatively convenient. In a further embodiment, the conditioning chamber is connected to a first temperature control device, and the isolation chamber is connected to a second temperature control device. Since the vibrator itself generates heat during operation, and the isolation chamber is small and prone to temperature fluctuations, the second temperature control device ensures the temperature stability of the isolation chamber. In one embodiment of the present invention, the second temperature control device may be an exhaust fan. The insulation chamber is provided with an air passage that communicates with the outside. The exhaust fan can generate airflow to expel the heat accumulated in the insulation chamber and ensure that the temperature of the insulation chamber is within the normal operating range of the vibrator. In another embodiment, the second temperature control device may have an active cooling effect to further prevent heat accumulation in the insulation chamber.

[0041] In some embodiments of the present invention, the movable platform has one x-axis side, one z-axis side, and two y-axis sides. The z-axis side has two first transmission docking portions, the x-axis side has two second transmission docking portions, and each y-axis side has a third transmission docking portion. The two second transmission docking portions, the two second transmission docking portions, and the two third transmission docking portions are symmetrically arranged based on the same xz-plane. The transmission mechanism includes two transmission groups symmetrically distributed based on the xz-plane. Each transmission group includes a main transmission component and a secondary transmission component, and each main transmission component is connected to a vibrator. The two transmission groups can improve the vibration stability of the movable platform, and in some cases, the two vibrators corresponding to the two transmission groups can have different vibration modes, thereby enabling the movable platform to simulate different vibration conditions of a vehicle. The base can be provided with a large insulated chamber in which both vibrators are placed, or it can be provided with two relatively independent smaller insulated chambers, each containing one vibrator.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A weathering test system for abnormal vibration testing, characterized in that: The system includes an environmental chamber and a noise testing device. The environmental chamber includes a base and a housing placed on top of the base. The housing forms a temperature-controlled chamber. The base has a mounting surface located below the temperature-controlled chamber. The base has an insulated chamber recessed relative to the mounting surface. The insulated chamber is separated from the temperature-controlled chamber by an insulation plate, which has a perforation connecting the two chambers. The noise testing device includes a drive mechanism, a transmission mechanism, and a load-bearing mechanism. The drive mechanism includes a vibrator and a pull rod connected to the vibrator. The vibrator is disposed in the insulated chamber, and the pull rod passes through the perforation. The upper end extends to the temperature control chamber. The transmission mechanism and the supporting mechanism are disposed above the mounting base. The supporting mechanism includes a support base and a movable platform. The support base and the movable platform are connected by an elastic connector. The movable platform has an x-axis side, a y-axis side, and a z-axis side. The z-axis side has a first transmission docking part, the x-axis side has a second transmission docking part, and the y-axis side has a third transmission docking part. The transmission mechanism includes a first positioning seat, a main transmission component, and a connecting rod. The main transmission component includes a first base, a driving arm, and a transmission arm. The first base is hinged to the first positioning seat. The driving arm and the transmission arm are connected to the first base. The end of the driving arm forms a driving end that can be connected to the pull rod. The transmission arm includes a first transmission arm extending in the x-direction and a second transmission arm extending in the z-direction. The ends of the first transmission arm and the second arm respectively form a first transmission end and a second transmission end. The first transmission end has a first connection hole that can be arranged in the z-direction, and the second transmission end has a second connection hole that can be arranged in the x-direction. The end of the connecting rod can be connected to the first transmission end and the first transmission docking part; the second transmission end and the second transmission docking part are connected. The transmission mechanism also includes a second positioning seat and a secondary transmission component. The secondary transmission component includes a second base, a third transmission arm extending in the y direction, and a fourth transmission arm extending in the z direction. The second base is hinged to the second positioning seat. The ends of the third transmission arm and the fourth transmission arm respectively form a third transmission end and a fourth transmission end. The third transmission end is connected to a first transmission end, and the fourth transmission end is connected to a third transmission docking part. The third transmission end has a third connection hole that can be arranged in the z direction, and the fourth transmission end has a fourth connection hole that can be arranged in the y direction. The first connection hole and the fourth connection hole are axially corresponding.

2. The weathering test system for abnormal vibration testing according to claim 1, characterized in that: The first transmission arm has an upper branch and a lower branch at its end. The first transmission end includes an upper end located on the upper branch and a lower end located on the lower branch. The upper end and the lower end each have an upper connecting hole that can be arranged in the z-direction and a lower connecting hole that can be arranged in the z-direction. The lower connecting hole corresponds to the fourth connecting hole in the axial direction.

3. The weathering test system for abnormal vibration testing according to claim 1, characterized in that: The elastic connector includes a spring sheet and a first connecting portion and a second connecting portion disposed at both ends of the spring sheet. The support base is provided with a first mounting portion corresponding to the first connecting portion, and the movable platform is provided with a second mounting portion corresponding to the second connecting portion.

4. A weathering test system for abnormal vibration testing according to claim 3, characterized in that: The first mounting part is provided with a first mounting surface, a second mounting surface and a third mounting surface, and the second mounting part is provided with a first corresponding surface, a second corresponding surface and a third corresponding surface. The first mounting surface and the first corresponding surface form a first mounting position that allows the spring to face the z-direction, the second mounting surface and the second corresponding surface form a second mounting position that allows the spring to face the x-direction, and the third mounting surface and the third corresponding surface form a third mounting position that allows the spring to face the y-direction.

5. A weathering test system for abnormal vibration testing according to claim 1, characterized in that: The temperature-regulating chamber is connected to a first temperature control device, and the temperature-isolated chamber is connected to a second temperature control device.

6. A weathering test system for abnormal vibration testing according to claim 1, characterized in that: The movable platform has one x-axis side, one z-axis side, and two y-axis sides. The z-axis side is provided with two first transmission docking parts, the x-axis side is provided with two second transmission docking parts, and each y-axis side is provided with a third transmission docking part. The transmission mechanism includes two transmission groups, each transmission group includes a main transmission component and a secondary transmission component, and each main transmission component corresponds to a vibrator.

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