A multi-axis electric vibration testing system for centrifugal fields

Abstract

This application discloses a multi-axis electric vibration testing system for centrifugal fields, relating to the field of spacecraft dynamics testing technology. The system includes a centrifuge, a triaxial electric vibration table, an overload balancing device, a centering control device, a cooling device, a power amplifier, and a multi-axis vibration controller. The triaxial electric vibration table and the overload balancing device are located on the centrifuge's rotating arm; the centering control device and the cooling device are located near the centrifuge's rotating shaft; and the power amplifier and the multi-axis vibration controller are located in a ground control room. Therefore, the triaxial electric vibration testing equipment used in this centrifugal force field can not only meet the requirements of overload plus multi-axis vibration composite testing, greatly improving the comprehensive environmental testing capability of overload plus multi-axis vibration, but can also be used as overload plus uniaxial vibration or overload plus biaxial vibration testing equipment. It can achieve one-time installation of the specimen and sequential completion of multiple overload plus uniaxial vibration or overload plus biaxial vibration composite tests, significantly improving testing efficiency.

Description

Technical Field

[0001] This invention generally relates to the field of spacecraft dynamics testing technology, and specifically to a multi-axis electric vibration testing system for centrifugal fields. Background Technology

[0002] Aerospace equipment typically operates in complex mechanical environments, such as rockets and satellites, which experience multiaxial vibration and high overload simultaneously during launch and recovery. Previously, limited by testing equipment, only overload tests and vibration tests in three unidirectional directions could be conducted to simulate their stress environment. Research shows that the mechanical environmental effects of tested products under combined overload and vibration conditions differ significantly from those under single mechanical conditions, and that the environmental effects of multiaxial vibration environments and uniaxial vibration environments on products are also quite different.

[0003] With the continuous development of environmental testing equipment technology, the vibration tables currently installed in related technologies mainly include single-axis hydraulic vibration tables, two-axis hydraulic vibration tables, and single-axis electric vibration tables. However, they can only simulate single-axis vibration or two-dimensional vibration in a centrifugal force field. The single-axis electric vibration table cannot simulate overload plus multi-axis vibration environment, and the two-axis hydraulic vibration table has a low working frequency, which cannot meet the environmental testing requirements of broadband random vibration of instruments and equipment in aerospace and other fields. All of these have limitations. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the related technologies, it is desirable to provide a multi-axis electric vibration test system for centrifugal fields that can more realistically simulate the comprehensive environment in which aerospace equipment is located and improve the effectiveness of ground mechanical environment tests.

[0005] This application provides a multi-axis electric vibration testing system for centrifugal fields, the system including a centrifuge, a triaxial electric vibration table, an overload balancing device, a centering control device, a cooling device, a power amplifier, and a multi-axis vibration controller;

[0006] The centrifuge's rotating arm is equipped with the triaxial electric vibration table body and the overload balancing device. Near the centrifuge's rotating shaft, there is a centering control device and a cooling device. The centering control device and the overload balancing device work together to control the moving coil of the vibration table to be at the center zero position. The cooling device is used to cool the vibration table.

[0007] The power amplifier and the multi-axis vibration controller are located in the ground control room. The power supply of the power amplifier is input from the ground to the triaxial electric vibration table through the power slip ring in the slip ring system of the centrifuge. The weak electrical signals of the power amplifier and the multi-axis vibration controller are connected to the triaxial electric vibration table through the signal slip ring in the slip ring system. The sensor installed on the motion platform of the triaxial electric vibration table is used to feed back the vibration signal to the multi-axis vibration controller through the signal slip ring.

[0008] Optionally, in some embodiments of this application, the triaxial electric vibration table body includes an X-axis vibration table arranged along the direction of the rotating arm, two Y-axis vibration tables arranged opposite each other along the centrifugal tangent direction, and a Z-axis vibration table arranged perpendicular to the direction of the rotating arm.

[0009] Optionally, in some embodiments of this application, the triaxial electric vibration table body further includes a triaxial table mounting base located at the distal end of the rotating arm;

[0010] The X-axis vibration table is connected to the triaxial table mounting base via an X-axis vibration table bracket. The vibration direction of the X-axis vibration table is consistent with the centrifugal force direction and is parallel to the ground. The Y-axis a-vibration table is connected to the triaxial table mounting base via a Y-axis a-vibration table bracket. The Y-axis b-vibration table is connected to the triaxial table mounting base via a Y-axis b-vibration table bracket. The vibration directions of the Y-axis a-vibration table and the Y-axis b-vibration table are perpendicular to the centrifugal force direction and are parallel to the ground. The Z-axis vibration table is connected to the triaxial table mounting base via a Z-axis vibration table bracket. The vibration direction of the Z-axis vibration table is perpendicular to the centrifugal force direction and is perpendicular to the ground.

[0011] Optionally, in some embodiments of this application, the triaxial electric vibration table body further includes an X-axis vibration table decoupling device, a Y-axis a vibration table decoupling device, a Y-axis b vibration table decoupling device, and a Z-axis vibration table decoupling device.

[0012] The X-axis vibration table decoupling device connects the moving coil surface of the X-axis vibration table to the motion platform, the Y-axis a-axis vibration table decoupling device connects the moving coil surface of the Y-axis a-axis vibration table to the motion platform, the Y-axis b-axis vibration table decoupling device connects the moving coil surface of the Y-axis b-axis vibration table to the motion platform, and the Z-axis vibration table decoupling device connects the moving coil surface of the Z-axis vibration table to the motion platform.

[0013] Optionally, in some embodiments of this application, each decoupling device includes a linear slide rail.

[0014] Optionally, in some embodiments of this application, the overload balancing device includes an air spring static centering mechanism and an electric centering dynamic centering mechanism.

[0015] Optionally, in some embodiments of this application, the air spring static centering mechanism includes an air spring and an air spring mounting bracket, wherein the air spring is located between the motion platform and the air spring mounting bracket;

[0016] Alternatively, the air spring static centering mechanism includes a hydraulic-air spring, a hydraulic-air spring decoupling device, and a hydraulic-air spring mounting bracket. One end of the hydraulic-air spring is connected to the motion platform through the hydraulic-air spring decoupling device, and the other end of the hydraulic-air spring is connected to the hydraulic-air spring mounting bracket.

[0017] Optionally, in some embodiments of this application, the cooling device includes a cooling duct, a fan mounting bracket, and a cooling fan. The fan mounting bracket is connected to the rotating arm, the cooling fan is mounted on the fan mounting bracket, and the air outlet of the cooling fan is connected to the main air inlet corresponding to the three-axis electric vibration table body through the cooling duct.

[0018] Optionally, in some embodiments of this application, the cooling fan is installed vertically.

[0019] Optionally, in some embodiments of this application, the cooling duct includes multiple duct sections and adapters, and the ducts are connected in parallel and then connected to the air outlet of the cooling fan through the adapters.

[0020] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0021] This application provides a multi-axis electric vibration testing system for centrifugal fields. The system includes a centrifuge, a triaxial electric vibration table, an overload balancing device, a centering control device, a cooling device, a power amplifier, and a multi-axis vibration controller. The triaxial electric vibration table and the overload balancing device are located on the centrifuge's rotating arm, the centering control device and the cooling device are located near the centrifuge's rotating shaft, and the power amplifier and the multi-axis vibration controller are located in a ground control room, making operation and use more convenient. Thus, the triaxial electric vibration testing equipment used in this centrifugal force field can not only greatly improve the comprehensive environmental testing capability of overload plus multi-axis vibration and meet the requirements of overload plus multi-axis vibration composite testing, but can also be used as overload plus uniaxial vibration or overload plus biaxial vibration testing equipment. It can realize the simultaneous installation of specimens and the sequential completion of multiple overload plus uniaxial vibration or overload plus biaxial vibration composite tests under various working conditions, greatly improving testing efficiency. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 A schematic diagram of the overall layout of a multi-axis electric vibration testing system for a centrifugal field provided in this application embodiment;

[0024] Figure 2 A partial structural schematic diagram of a multiaxial electric vibration testing system for a centrifugal field is provided in an embodiment of this application.

[0025] Figure 3 A partial structural diagram (without centrifuge) of another multi-axis electric vibration testing system for a centrifugal field provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram of a three-axis electric vibration table structure (without a motion platform) provided for an embodiment of this application;

[0027] Figure 5 A block diagram illustrating the working principle of an overload balancing device and a centering control device provided in this application embodiment;

[0028] Figure 6 This application provides a schematic diagram of the ductwork connection between four electric vibration tables and one cooling fan, as shown in the embodiments of this application.

[0029] Figure 7 This is a schematic diagram of an electric vibration table platform locking structure provided in an embodiment of this application.

[0030] Figure label:

[0031] 1-Multi-axis electric vibration testing system, 11-Centrifuge, 111-Rotating arm, 112-Rotating shaft, 113-Slip ring system, 12-Triaxial electric vibration table body, 121-Motion platform, 122-Sensor, 123-X-axis vibration table, 1231-X-axis vibration table body, 1232-X-axis vibration table support, 1233-X-axis vibration table decoupling device, 1234-X-axis vibration table cooling duct, 124-Y-axis a-vibration table, 1241-Y-axis a-vibration table body, 1242-Y-axis a-vibration table support, 1243-Y-axis a-vibration table decoupling device, 1244-Y-axis a-vibration table cooling duct, 125-Y-axis b-vibration table, 1251-Y-axis b-vibration table body, 1 252-Y-axis b-axis vibration table support, 1253-Y-axis b-axis vibration table decoupling device, 1254-Y-axis b-axis vibration table cooling duct, 126-Z-axis vibration table, 1261-Z-axis vibration table body, 1262-Z-axis vibration table support, 1263-Z-axis vibration table decoupling device, 1264-Z-axis vibration table cooling duct, 127-Three-axis table mounting base, 13-Overload balancing device, 131-Air spring, 132-Adapter plate, 133-Air spring mounting bracket, 14-Centering control device, 15-Cooling device, 151-Cooling duct, 152-Fan mounting bracket, 153-Cooling fan, 16-Power amplifier, 17-Multi-axis vibration controller, a-Moving coil locking component. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0033] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described can be implemented in orders other than those illustrated or described herein.

[0034] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product, or device.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0036] For ease of understanding and explanation, the following will use... Figures 1 to 7 This application provides a detailed description of the multi-axis electric vibration testing system for centrifugal fields provided in the embodiments of this application.

[0037] Please refer to Figure 1 This is a schematic diagram of the overall layout of a multi-axis electric vibration test system for centrifugal fields provided in an embodiment of this application. The multi-axis electric vibration test system 1 includes a centrifuge 11, a triaxial electric vibration table 12, an overload balancing device 13, a centering control device 14, a cooling device 15, a power amplifier 16, and a multi-axis vibration controller 17.

[0038] The centrifuge 11 has a three-axis electric vibration table 12 and an overload balancing device 13 on its rotating arm 111. A centering control device 14 and a cooling device 15 are located near the rotating shaft 112 of the centrifuge 11. The centering control device 14 and the overload balancing device 13 work together to control the moving coil of the vibration table to the center zero position. The cooling device 15 cools the vibration table. The power amplifier 16 and the multi-axis vibration controller 17 are located in the ground control room. The power amplifier 16 is powered from the ground to the three-axis electric vibration table 12 through a power slip ring in the slip ring system 113 of the centrifuge 11. The power amplifier 16 and the multi-axis vibration controller 17 provide control, monitoring, and protection signals to the three-axis electric vibration table 12 through a signal slip ring in the slip ring system 113. Sensors 122 installed on the motion platform 121 of the three-axis electric vibration table 12 can feed back vibration signals to the multi-axis vibration controller 17 through a signal slip ring.

[0039] For example, Figures 2 to 4 As shown, in this embodiment of the application, the triaxial electric vibration table body 12 may include an X-axis vibration table 123 arranged along the direction of the rotating arm, two Y-axis vibration tables (i.e., Y-axis a vibration table 124 and Y-axis b vibration table 125) arranged opposite each other along the centrifugal tangent direction, and a Z-axis vibration table 126 arranged perpendicular to the direction of the rotating arm.

[0040] It should be noted that the embodiments of this application adopt a symmetrical structure with vibration tables arranged in the XYYZ directions. Two vibration tables are arranged face-to-face in the Y direction. Therefore, when the axis of the vibration table in the X direction coincides with the axis of the centrifuge arm, the vibration tables can be symmetrical about the XZ plane, without additional torque. This also helps to improve the overall structural strength and rigidity of the table body. The electrically driven vibration table installed along the arm in the X direction can be as follows... Figure 2-4As shown, it can be placed near the center of the shaft, or it can be placed at the far end, with the Y and Z axial vibration tables placed at the near end. The actual design should select the method with the better stress conditions based on the analysis.

[0041] Furthermore, the triaxial electric vibration table body 12 may also include a triaxial table mounting base 127 located at the far end of the rotating arm, which is connected to the centrifuge 11 by screws. Specifically, the X-axis vibration table 1231 is connected to the triaxial table mounting base 127 via the X-axis vibration table bracket 1232 using screws. The vibration direction of the X-axis vibration table 123 is consistent with the centrifugal force direction and is parallel to the ground. The Y-axis a-vibration table 1241 is connected to the triaxial table mounting base 127 via the Y-axis a-vibration table bracket 1242 using screws. The Y-axis b-vibration table 1251 is connected to the triaxial table mounting base 127 via the Y-axis b-vibration table bracket 1252 using screws. The vibration directions of the Y-axis a-vibration table 124 and the Y-axis b-vibration table 125 are perpendicular to the centrifugal force direction and are parallel to the ground. The Z-axis vibration table 1261 is connected to the triaxial table mounting base 127 via the Z-axis vibration table bracket 1262 using screws. The vibration direction of the Z-axis vibration table 126 is perpendicular to the centrifugal force direction and is perpendicular to the ground.

[0042] Furthermore, the triaxial electric vibration table body 12 may also include an X-axis vibration table decoupling device 1233, a Y-axis vibration table decoupling device 1243, a Y-axis vibration table decoupling device 1253, and a Z-axis vibration table decoupling device 1263. For example, each decoupling device includes a linear slide rail, thereby achieving motion decoupling of the three-axis vibrations in the triaxial electric vibration table system through four sets of decoupling devices. Among them, the X-axis vibration table decoupling device 1233 connects the moving coil table surface of the X-axis vibration table to the motion platform 121, the Y-axis vibration table decoupling device 1243 connects the moving coil table surface of the Y-axis vibration table to the motion platform 121, the Y-axis vibration table decoupling device 1253 connects the moving coil table surface of the Y-axis vibration table to the motion platform 121, and the Z-axis vibration table decoupling device 1263 connects the moving coil table surface of the Z-axis vibration table to the motion platform 121.

[0043] It should be noted that the embodiments of this application employ linear slide rail decoupling. Each decoupling device can achieve decoupling in two directions and force transmission in one direction. This structure can not only achieve triaxial vibration of the vibration table system under centrifugal conditions, but also uniaxial vibration and biaxial vibration under centrifugal conditions. When the triaxial electric vibration table undergoes overload plus uniaxial vibration tests, locking the moving coils of the electric vibration table in the other two directions can serve as a guide device for the working vibration table, improving its torsional and overturning resistance. Similarly, when the triaxial electric vibration table undergoes overload plus biaxial vibration tests, locking the moving coil of the electric vibration table in the other direction can serve as a guide device for the working vibration table, improving its torsional and overturning resistance, and enabling it to better adapt to the centrifugal environment.

[0044] For example Figure 5 As shown, the overload balancing device 13 in this embodiment may include an air spring static centering mechanism and an electric centering dynamic centering mechanism. The air spring static centering mechanism includes, but is not limited to, an air spring 131, an adapter plate 132, and an air spring mounting bracket 133. The air spring mounting bracket 133 is connected to the three-axis stage mounting base 127, while the air spring 131 is located between the motion platform 121 and the air spring mounting bracket 133. Alternatively, the air spring static centering mechanism may include, but is not limited to, a hydraulic spring, an adapter plate, a hydraulic spring decoupling device, and a hydraulic spring mounting bracket. One end of the hydraulic spring is connected to the motion platform 121 via the hydraulic spring decoupling device, thereby achieving motion decoupling in the non-load-bearing direction, while the other end of the hydraulic spring is connected to the hydraulic spring mounting bracket.

[0045] The electric centering dynamic centering mechanism includes, but is not limited to, the power amplifier 16 and the moving coil of the X-axis vibration table. In this case, the X-axis vibration table 123 needs to be designed with electric centering functionality. The centering control device 14 can adjust the position of the four vibration table air springs and the overload balance air spring according to the position of each moving coil, and can also control the electric centering to achieve moving coil centering. For example, before the electric vibration table vibrates, during the centrifuge acceleration process, the moving coil of the X-axis vibration table leaves the equilibrium position under the action of centrifugal acceleration. After the centering control device 14 detects the position deviation of the moving coil, it controls the air valve to charge or release air to adjust the air spring pressure to pull the moving coil back to the center zero position. During the vibration of the vibration table, after the electric centering dynamic centering detects that the moving coil has deviated from the center zero position, it controls the power amplifier 16 to supply DC current to the moving coil to generate electromagnetic force to counteract the centrifugal force, thus achieving dynamic centering of the moving coil.

[0046] It should be noted that the overload balancing device 13 in this embodiment combines static air spring alignment with dynamic electric alignment, enabling the moving coil of the vibration table in the X direction to always maintain its center zero position during operation. Static air spring alignment can achieve a larger balancing force, while dynamic electric alignment has a higher response speed. The combination of these two alignment methods better ensures that the moving coil of the vibration table maintains its center zero position during vibration in a centrifugal environment. For systems with small moving parts and small working displacements, static alignment using an air spring overload balancing device is preferred. For systems with large thrust or large displacement, static alignment using a hydraulic-pneumatic spring overload balancing device is preferred, with a decoupling device installed at the hydraulic-pneumatic spring end to decouple the motion in the non-load direction at the hydraulic-pneumatic spring end. It is understood that in this embodiment, zero-position alignment can be achieved by simply applying DC current to the moving coil winding (electric alignment) or by simply using an air spring to support zero-position alignment.

[0047] For example Figure 6As shown, in this embodiment of the application, the cooling device 15 may include a cooling duct 151, a fan mounting bracket 152, and a cooling fan 153. The fan mounting bracket 152 is connected to the rotating arm 111 by screws. The cooling fan 153 is mounted on the fan mounting bracket 152 by screws. The cooling fan 153 is installed vertically, with its installation position close to the rotating shaft 112 of the centrifuge 11. Its air outlet is connected to the main air inlet of the triaxial electric vibration table body 12 through the cooling duct 121. Furthermore, the cooling duct 151 includes multiple duct sections and adapters. For example, the multiple duct sections include, but are not limited to, the cooling duct 1234 of the X-direction vibration table 123, the cooling duct 1244 of the Y-direction a vibration table 124, the cooling duct 1254 of the Y-direction b vibration table 125, and the cooling duct 1264 of the Z-direction vibration table 126. After the ducts are connected in parallel, they are connected to the air outlet of the cooling fan 153 through the adapters. Thus, multiple electric vibration tables can be cooled by one cooling fan 153, which is easy to install and more reliable to use.

[0048] It should be noted that the embodiments of this application adopt a vertical installation of the fan and a blower cooling installation method, which can minimize the impact of Coriolis force on the fan and avoid the problem that the impeller of a horizontally installed fan is easily damaged by a large bending moment in a centrifugal environment. In addition, as the centrifugal acceleration increases, the air supply pressure also increases accordingly. The higher the centrifugal acceleration, the better the cooling effect.

[0049] The working process of the multi-axis electric vibration testing system 1 in this application embodiment is illustrated below. ① Conducting an overload plus triaxial vibration composite environment test. Before operation, the test specimen and sensor 122 are first installed on the motion platform 121; then, the power amplifier 16, cooling fan 153, multi-axis vibration controller 17 and centering control device 14 are turned on, and the test parameters of the multi-axis vibration controller 17 are set; then, the centering control device 14 is manually or automatically controlled to inflate the air springs of the Y-axis a vibration table and the X-axis vibration table, so that the air springs reach the preset initial pressure value (the magnitude of the preset pressure value determines the system stiffness); then, according to the position of the moving coil of the vibration table, the centering control device 14 inflates and deflates the air springs of the Z-axis vibration table and the Y-axis b vibration table respectively, so as to realize that the moving coils of the Z-axis vibration table, the Y-axis a vibration table, and the Y-axis b vibration table are in the centering balance position. At this time, the motion platform 121 is in the center zero position in the Y and Z directions.

[0050] When preparing to start work, the power amplifier 16 gain is turned on, and the centrifuge 11 is started. During the acceleration of the centrifuge 11, the static centering function of the centering control device 14 is activated. The centering control device 14 can control the air valve G to inflate the overload balance air spring according to the position of the moving coil, so that the moving coil of the X-axis vibration table remains at the center zero position. At this time, the centering control device 14 continues to detect whether the moving coils of all vibration tables in the Y and Z directions remain at the center zero position. If there is a deviation, the air pressure of the Z-axis vibration table air spring and the Y-axis b vibration table air spring is finely adjusted so that the moving coils of the Y-axis a vibration table, the Y-axis b vibration table, and the Z-axis vibration table remain at the center zero position, and finally the motion platform 121 is at the center zero position in the X, Y, and Z directions.

[0051] When the centrifugal acceleration reaches the predetermined value, after confirming that all moving coils of the vibration table are at the center zero position, the static alignment function is turned off and the dynamic alignment function is turned on, and the overload and vibration comprehensive environmental test begins. During operation, fluctuations in centrifugal acceleration cause the moving coil of the X-axis vibration table to shift position. The dynamic alignment function of the alignment control device 14 can control the power amplifier 16 to input DC power to the moving coil winding to pull it back to the center zero position based on the feedback result of the moving coil position, thereby ensuring the dynamic alignment of the moving coil of the X-axis vibration table during the test. During vibration, the sensor 122 installed on the motion platform 121 transmits the vibration data of the three-axis electric vibration table body 12 to the multi-axis vibration controller 17 through the signal slip ring of the slip ring system 113.

[0052] After the test, the dynamic centering function is turned off. During the process of centrifugal acceleration reduction, the static centering function of the centering control device 14 is turned on. The centering control device 14 can control the air valve G to release air from the overload balance air spring according to the position of the moving coil, so that the moving coil of the X-axis vibration table remains at the center zero position, and automatically or manually release air from the air springs of the Y-axis a vibration table, Y-axis b vibration table, and Z-axis vibration table. After all tests are completed, the power amplifier gain and all power supplies are turned off.

[0053] ② Conduct a combined environmental test involving overload and X-axis uniaxial vibration. Before operation, lock all moving coils of the vibration tables installed in the Y and Z directions using moving coil locking devices, such as... Figure 7 In the figure, 'a' represents the moving coil locking component. At this point, the motion platform 121 is already at the center zero position in the Y and Z directions. The centering process and test process of the moving coil of the vibration table in the X direction are similar to those of the overload plus triaxial vibration combined environment test, and will not be described in detail here.

[0054] ③ Conduct a combined environmental test of overload and XY-axis biaxial vibration. Before operation, lock the moving coil of the Z-axis vibration table using the moving coil locking device. At this time, the motion platform 121 is in the center zero position in the Z-axis. The alignment process and test process of the moving coils of the Y-axis and Z-axis vibration tables are similar to those of the combined environmental test of overload and triaxial vibration. The working process of other combined environmental tests of overload and uniaxial vibration, such as overload and tangential Y-axis uniaxial vibration, overload and vertical arm Z-axis uniaxial vibration, overload and XZ-axis biaxial vibration, and overload and YZ-axis biaxial vibration, can basically refer to the above process. In summary, the multi-axis electric vibration test system 1 in this embodiment has the advantages of convenient installation, easy use, and strong applicability.

[0055] It should be noted that the descriptions of the same content in this embodiment as in other embodiments can be found in the descriptions in other embodiments, and will not be repeated here.

[0056] The multi-axis electric vibration testing system for centrifugal fields provided in this application includes a centrifuge, a triaxial electric vibration table, an overload balancing device, a centering control device, a cooling device, a power amplifier, and a multi-axis vibration controller. The triaxial electric vibration table and the overload balancing device are located on the centrifuge's rotating arm, the centering control device and the cooling device are located near the centrifuge's rotating shaft, and the power amplifier and the multi-axis vibration controller are located in a ground control room, making operation and use more convenient. Thus, the triaxial electric vibration testing equipment used in this centrifugal force field can not only greatly improve the comprehensive environmental testing capability of overload plus multi-axis vibration and meet the requirements of overload plus multi-axis vibration composite testing, but can also be used as overload plus uniaxial vibration or overload plus biaxial vibration testing equipment. It can realize the simultaneous installation of specimens and sequential completion of multiple overload plus uniaxial vibration or overload plus biaxial vibration composite tests under various working conditions, greatly improving testing efficiency.

[0057] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A multi-axis electrodynamic vibration testing system for centrifugal fields, characterized by, The system includes a centrifuge, a triaxial electric vibration table, an overload balancing device, a centering control device, a cooling device, a power amplifier, and a multi-axis vibration controller. The centrifuge's rotating arm is equipped with the triaxial electric vibration table body and the overload balancing device. Near the centrifuge's rotating shaft, there is a centering control device and a cooling device. The centering control device and the overload balancing device work together to control the moving coil of the vibration table to be at the center zero position. The cooling device is used to cool the vibration table. The power amplifier and the multi-axis vibration controller are located in the ground control room. The power supply of the power amplifier is input from the ground to the triaxial electric vibration table through the power slip ring in the slip ring system of the centrifuge. The weak electrical signals of the power amplifier and the multi-axis vibration controller are connected to the triaxial electric vibration table through the signal slip ring in the slip ring system. The sensor installed on the motion platform of the triaxial electric vibration table is used to feed back the vibration signal to the multi-axis vibration controller through the signal slip ring. The triaxial electric vibration table body includes an X-axis vibration table arranged along the direction of the rotating arm, two Y-axis vibration tables arranged opposite each other along the centrifugal tangent direction, and a Z-axis vibration table arranged perpendicular to the direction of the rotating arm. The three-axis electric vibration table body also includes a three-axis table mounting base located at the far end of the rotating arm; The X-axis vibration table is connected to the triaxial table mounting base via an X-axis vibration table bracket. The vibration direction of the X-axis vibration table is consistent with the centrifugal force direction and is parallel to the ground. The Y-axis a-vibration table is connected to the triaxial table mounting base via a Y-axis a-vibration table bracket. The Y-axis b-vibration table is connected to the triaxial table mounting base via a Y-axis b-vibration table bracket. The vibration directions of the Y-axis a-vibration table and the Y-axis b-vibration table are perpendicular to the centrifugal force direction and are parallel to the ground. The Z-axis vibration table is connected to the triaxial table mounting base via a Z-axis vibration table bracket. The vibration direction of the Z-axis vibration table is perpendicular to the centrifugal force direction and is perpendicular to the ground.

2. The multi-axis electric vibration testing system according to claim 1, characterized in that, The triaxial electric vibration table body also includes an X-axis vibration table decoupling device, a Y-axis vibration table decoupling device, a Y-axis vibration table decoupling device, and a Z-axis vibration table decoupling device. The X-axis vibration table decoupling device connects the moving coil surface of the X-axis vibration table to the motion platform, the Y-axis a-axis vibration table decoupling device connects the moving coil surface of the Y-axis a-axis vibration table to the motion platform, the Y-axis b-axis vibration table decoupling device connects the moving coil surface of the Y-axis b-axis vibration table to the motion platform, and the Z-axis vibration table decoupling device connects the moving coil surface of the Z-axis vibration table to the motion platform.

3. The multi-axis electric vibration testing system according to claim 2, characterized in that, Each decoupling device includes a linear guide rail.

4. The multi-axis electric vibration testing system according to claim 1, characterized in that, The overload balancing device includes an air spring static centering mechanism and an electric centering dynamic centering mechanism.

5. The multi-axis electric vibration testing system according to claim 4, characterized in that, The air spring static centering mechanism includes an air spring and an air spring mounting bracket, with the air spring located between the motion platform and the air spring mounting bracket; Alternatively, the air spring static centering mechanism includes a hydraulic-air spring, a hydraulic-air spring decoupling device, and a hydraulic-air spring mounting bracket. One end of the hydraulic-air spring is connected to the motion platform through the hydraulic-air spring decoupling device, and the other end of the hydraulic-air spring is connected to the hydraulic-air spring mounting bracket.

6. The multi-axis electric vibration testing system according to any one of claims 1 to 5, characterized in that, The cooling device includes a cooling duct, a fan mounting bracket, and a cooling fan. The fan mounting bracket is connected to the rotating arm, and the cooling fan is mounted on the fan mounting bracket. The air outlet of the cooling fan is connected to the main air inlet of the triaxial electric vibration table body through the cooling duct.

7. The multi-axis electric vibration testing system according to claim 6, characterized in that, The cooling fan is installed vertically.

8. The multi-axis electric vibration testing system according to claim 6, characterized in that, The cooling duct includes multiple duct sections and adapters. The ducts are connected in parallel and then connected to the air outlet of the cooling fan through the adapters.

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