Active vibration-absorbing support rod and vibration reduction system with spatial accuracy maintenance capability

Abstract

The present invention provides an active vibration-absorbing support rod with the ability to maintain spatial accuracy, which realizes vibration isolation based on the principle of force offset. While isolating vibration, it will not affect the initial position and angle accuracy of the moving parts, thereby maintaining the spatial (position and angle) accuracy of the moving parts. The active vibration-absorbing support rod includes: a flexible hinge A, a flexible hinge B, a vibration-absorbing actuator housing, a vibration-absorbing actuator base, a vibration-absorbing actuator and a force sensor; the flexible hinge A and the flexible hinge B provide low bending stiffness in two directions perpendicular to the axial direction, so that the active vibration-absorbing support rod is equivalent to a two-force rod in mechanics; the force sensor measures at least the axial force information, and the vibration-absorbing actuator provides an axial actuating force under the drive of an external controller. The force sensor, the vibration-absorbing actuator and the controller form a closed-loop control system for the axial force. In addition, the present invention also provides a vibration reduction system based on the above-mentioned active vibration-absorbing support rod.

Description

Technical Field

[0001] The invention relates to a vibration reduction device, in particular to a vibration reduction support rod and a vibration reduction system, and belongs to the technical field of satellite design and application. Background Art

[0002] Periodic reciprocating parts on remote sensing satellites, such as refrigerators and control moment gyroscopes (CMGs), will produce periodic micro-vibrations when they are working. As the resolution requirements of remote sensing satellites become higher and higher, micro-vibrations transmitted to the camera may affect the image quality. Therefore, it is necessary to take vibration isolation measures for the micro-vibration source to reduce the impact of its periodic micro-vibration on the camera.

[0003] However, the CMG itself has angle pointing requirements, and the Dewar assembly in the refrigerator has high position accuracy requirements and needs to participate in optical alignment. The vibration isolation requirements of this type of disturbance source that participates in optical alignment and has position and angle accuracy requirements cannot be solved by low-rigidity passive vibration isolators and active vibration isolation devices based on displacement actuators, because low-rigidity passive vibration isolators will cause excessive displacement in the low-frequency band due to their low stiffness, thus exceeding the requirements. Summary of the invention

[0004] In view of this, in order to meet the vibration isolation needs of moving parts that require position and angle accuracy maintenance, the present invention provides an active vibration-absorbing support rod with the ability to maintain spatial accuracy, and spatial accuracy maintenance refers to the accuracy maintenance of spatial position and angle.

[0005] An active vibration-absorbing support rod capable of maintaining spatial accuracy, comprising: a flexible hinge A, a flexible hinge B, a vibration-absorbing actuator housing, a vibration-absorbing actuator base, a vibration-absorbing actuator and a force sensor;

[0006] One axial end of the vibration absorbing actuator housing is connected to the vibration source through a flexible hinge A, and the other end is connected to the vibration absorbing actuator base;

[0007] The force sensor is pressed between the flexible hinge B and the base of the vibration absorbing actuator; the force sensor has a preload force; the force sensor is used to collect axial force information and transmit it to an external controller;

[0008] The flexible hinge B is connected to the basic structure;

[0009] A vibration absorbing actuator is installed inside the vibration absorbing actuator housing, and the vibration absorbing actuator is used to generate an axial force under the action of a controller to offset the disturbing axial force of the disturbance source.

[0010] As a preferred embodiment of the present invention: the vibration absorbing actuator comprises: a voice coil motor mover, a voice coil motor stator and a vibration force transmission component;

[0011] The voice coil motor mover can move in the axial direction;

[0012] The stator of the voice coil motor is fixedly connected to the housing of the vibration absorbing actuator and is electrically connected to an external controller;

[0013] The vibration force transmission component is fixedly connected to the voice coil motor mover, and transmits the axial actuating force generated by the voice coil motor mover to the vibration absorbing actuator housing and the vibration absorbing actuator base.

[0014] As a preferred embodiment of the present invention: the vibration force transmission assembly includes: a diaphragm spring A, a diaphragm spring B, a limit block A, a limit block B and a connecting bolt;

[0015] The membrane spring A is installed between the flexible hinge A and the housing of the vibration absorbing actuator; the membrane spring B is installed between the housing of the vibration absorbing actuator and the base of the vibration absorbing actuator;

[0016] The connecting bolt passes through the diaphragm spring B, the voice coil motor stator, the voice coil motor mover, and the diaphragm spring A in sequence from bottom to top and is then locked by a nut;

[0017] The upper and lower ends of the membrane spring A are respectively pressed by nuts and limit blocks A sleeved on the connecting bolts;

[0018] The upper and lower ends of the membrane spring B are respectively tightened by a limit block B sleeved on the connecting bolt and a nut of the connecting bolt.

[0019] As a preferred embodiment of the present invention: the force sensor is mounted on the stud on the upper end surface of the flexible hinge B; the part of the stud that passes through the force sensor is locked with the base of the vibration absorbing actuator by a nut, and the force sensor is pressed between the flexible hinge B and the base of the vibration absorbing actuator; a pre-tightening force is applied to the force sensor by the nut.

[0020] As a preferred embodiment of the present invention, the limit block A, the limit block B and the voice coil motor mover are processed integrally.

[0021] As a preferred embodiment of the present invention, the flexible hinge A, the flexible hinge B, the vibration absorbing actuator housing, and the vibration absorbing actuator base are all made of metal.

[0022] As a preferred embodiment of the present invention, the internal sensitive element of the force sensor is made of piezoelectric material.

[0023] In addition, the present invention provides a vibration reduction system, comprising: more than three active vibration reduction support rods; the active vibration reduction support rods are the above-mentioned active vibration reduction support rods with the ability to maintain spatial accuracy, and the more than three active vibration reduction support rods are arranged between the disturbance source and the basic structure according to a set spatial angle; the more than three active vibration reduction support rods are electrically connected to the controller respectively.

[0024] Preferably, one end of the active vibration-absorbing support rod is connected to the disturbance source through a switching angle box, and the other end is connected to the base structure through a switching angle box.

[0025] Preferably, the vibration reduction system includes six active vibration-absorbing support rods; the six active vibration-absorbing support rods are grouped in pairs; three groups of active vibration-absorbing support rods are evenly spaced along the circumferential direction; one end of the two active vibration-absorbing support rods in each group is connected to the base structure at a set angle through a transition angle box, and the other end is connected to the same position of the disturbance source through a transition angle box.

[0026] Beneficial effects:

[0027] (1) The active vibration-damping support rod of the present invention has no flexible links in the axial direction, and can provide good rigid support for the moving parts (i.e., the disturbance source). The active vibration-damping support rod realizes vibration isolation based on the principle of force cancellation. While isolating the vibration, it will not affect the initial position and angle accuracy of the moving parts, thereby maintaining the spatial (position and angle) accuracy of the moving parts. The active vibration-damping support rod has good integrity and high versatility, and can be applied to the vibration isolation needs of various moving parts, and has broad application prospects.

[0028] (2) The active vibration-absorbing support rod of the present invention adopts a voice coil motor controlled by an external controller as a vibration-absorbing actuator. If the disturbance frequency of the moving parts deviates from the design value, or if the performance deteriorates after long-term operation in orbit, resulting in frequency drift, the vibration-absorbing frequency can be adjusted at any time by modifying the controller parameters to adapt to high-performance vibration absorption throughout the life cycle of the spacecraft.

[0029] (3) In the active vibration-absorbing support rod of the present invention, a membrane spring is used to transmit the axial force, and the axial actuating force generated by the voice coil motor mover is transmitted to the vibration-absorbing actuator housing and the vibration-absorbing actuator base, which can improve the vibration-absorbing effect of the active vibration-absorbing support rod.

[0030] (4) The vibration reduction system based on the active vibration reduction support rod of the present invention has the high rigidity characteristics of conventional equipment support brackets. There is no flexible vibration reduction link on the load transfer path of the vibration reduction system. After ground optical assembly and adjustment, it can still maintain the accuracy of position and angle after undergoing a full cycle of ground testing, assembly, storage, launch, and in-orbit environments. At the same time, the vibration reduction system can measure the disturbance force information on the active vibration reduction support rod through a force sensor and transmit it to the controller; the controller drives the vibration absorption actuator inside the active vibration reduction support rod to work, offset the periodic disturbance force, and achieve the vibration reduction effect. In addition, the vibration reduction frequency of the vibration reduction system can be adjusted by adjusting the controller parameters, and it has strong adaptability to the vibration reduction needs of disturbance sources that produce frequency drift due to performance degradation after long-term in-orbit operation.

[0031] (5) In the vibration reduction system of the active vibration reduction support rod based on the present invention, the disturbance source and the basic structure are connected through an adapter angle box, the precision adjustment of the disturbance source is achieved through the adjustment of the adapter angle box, and the precision maintenance of the position and angle of the disturbance source is achieved through the high stiffness characteristics of the vibration reduction system.

[0032] (6) In the vibration reduction system based on the active vibration reduction support rod of the present invention, multiple active vibration reduction support rods in different directions are arranged; through the layout of multiple support rods, force offset in various directions can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A cross-sectional view of an active vibration-absorbing support rod with the ability to maintain spatial accuracy (the vibration-absorbing actuator part is not cut);

[0035] Figure 2 A cross-sectional view of an embodiment of an active vibration-absorbing support rod having the ability to maintain spatial accuracy;

[0036] Figure 3 It is a schematic diagram of a vibration reduction system with the ability to maintain spatial accuracy;

[0037] Figure 4 It is the principle diagram of the transmission of the disturbance force of the vibration reduction system;

[0038] Figure 5 This is a diagram showing an embodiment of a vibration reduction system with six groups of support rods.

[0039] Among them: 1-flexible hinge A, 2-vibration absorbing actuator housing, 3-vibration absorbing actuator, 4-vibration absorbing actuator base, 5-force sensor, 6-flexible hinge B, 7-membrane spring A, 8-limit block A, 9-voice coil motor mover, 10-limit block B, 11-connecting bolt, 12-voice coil motor stator, 13-membrane spring B, 100-disturbance source, 200-adaptation angle box, 300-active vibration cancellation support rod, 400-controller DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0041] The present embodiment is used to explain the present invention, but is not limited to the present invention. In order to make the public have a better understanding of the present invention, the following description is some specific details.

[0042] Embodiment 1:

[0043] This embodiment provides an active vibration-absorbing support rod with the ability to maintain spatial accuracy, which achieves vibration isolation based on the principle of force cancellation. It can be used for vibration isolation of moving parts with high position and angular accuracy requirements, and can isolate vibration without changing the initial position and angular accuracy of the moving parts.

[0044] like Figure 1 As shown, the active vibration absorption support rod includes: a flexible hinge A1, a flexible hinge B6, a vibration absorption actuator housing 2, a vibration absorption actuator base 4, a vibration absorption actuator 3 and a force sensor 5.

[0045] Wherein: one end of the vibration absorbing actuator housing 2 is connected to the flexible hinge A1, and the other end is connected to the vibration absorbing actuator base 4; specifically: the flexible hinge A1 has connecting holes at both axial ends, one end is connected to the disturbance source (i.e., the moving part) through a fastener, and the other end is connected to the vibration absorbing actuator housing 2 through a fastener. The vibration absorbing actuator housing 2 is a structure with an axial opening at one end and a through hole processed at the other end; wherein the flexible hinge A1 is connected to its open end. The vibration absorbing actuator base 4 is a hollow frustum structure with an opening at the large end and a through hole processed at the small end. The end where the through hole of the vibration absorbing actuator housing 2 is located is coaxially connected to the large end of the vibration absorbing actuator base 4 through a fastener.

[0046] The upper end face of the flexible hinge B6 is designed with a stud, and the force sensor 5 of the hollow cylindrical structure is mounted on the light rod part of the stud. The threaded part of the stud passes through the force sensor 5 and then further passes through the through hole at the small end of the vibration absorbing actuator base 4, and is locked by a nut, thereby pressing the vibration absorbing actuator base 4 and the force sensor 5; thereby, the force sensor 5 is pressed between the flexible hinge B6 and the vibration absorbing actuator base 4. By applying a pre-tightening torque through the nut, the purpose of pre-tightening the force sensor 5 can be achieved, so that it can measure axial tension and pressure. The lower end face of the flexible hinge B6 is designed with a connecting hole, which is connected to the basic structure of the spacecraft.

[0047] The flexible hinge A1, the vibration absorbing actuator housing 2, the vibration absorbing actuator base 4, the force sensor 5, and the flexible hinge B6 are coaxially connected in sequence to form a "two-force rod" structure in mechanics, which can only transmit the axial force of the support rod. The force sensor 5 is connected to the external controller through a cable, and the force sensor 5 collects the axial force information of the active vibration absorbing support rod and transmits it to the external controller.

[0048] Both axial ends of the active vibration-absorbing support rod are flexible hinges, and the bending stiffness of the flexible hinges in two directions perpendicular to the axial direction of the vibration-absorbing support rod is much lower than the axial stiffness. Therefore, only the axial displacement of the active vibration-absorbing support rod is limited, and the rotation of the active vibration-absorbing support rod around its own axis is not limited.

[0049] The vibration absorbing actuator 3 is installed in the vibration absorbing actuator housing 2, and a locking hole and a cable through hole for the vibration absorbing actuator 3 are arranged on the side surface of the vibration absorbing actuator housing 2.

[0050] like Figure 2 As shown, the vibration absorbing actuator 3 includes: two diaphragm springs (respectively diaphragm spring A7 and diaphragm spring B13), two limit blocks (respectively limit block A8 and limit block B10), connecting bolts 11, a voice coil motor mover 9 and a voice coil motor stator 12.

[0051] The voice coil motor mover 9 is an annular structure with a center hole, and an annular groove coaxial with the center hole is processed on its lower end surface, so that a center boss is formed in its center part; the voice coil motor stator 12 is an annular structure with an opening at the upper end and a through hole processed at the lower end. The voice coil motor mover 9 and the voice coil motor stator 12 are coaxially arranged, wherein the center boss of the voice coil motor mover 9 is located in the center hole of the voice coil motor stator 12, and the annular shell of the voice coil motor stator 12 is located in the annular groove of the voice coil motor mover 9. The voice coil motor mover 9 and the voice coil motor stator 12 are slidably matched, and the voice coil motor mover 9 can move axially.

[0052] The end where the through hole of the voice coil motor stator 12 is located is fixedly connected to the vibration absorbing actuator housing 2 (the fastener realizes the connection between the voice coil motor stator 12 and the vibration absorbing actuator housing 2 through the locking hole on the outer circumference of the vibration absorbing actuator housing 2), and the cable of the voice coil motor stator 12 passes through the cable through-hole on the vibration absorbing actuator housing 2 and is connected to the external controller. The external controller supplies power to the voice coil motor stator 12 to form an electromagnetic field, driving the voice coil motor mover 9 along the axial movement of the support rod. That is, the active vibration cancellation support rod is connected to the external control through two cables, namely, the cable connected to the voice coil motor stator 12 and the cable connected to the force sensor 5.

[0053] The voice coil motor mover 9 is connected with two membrane springs and two limit blocks through connecting bolts 11 to form the vibration part of the vibration absorbing actuator 3. The two membrane springs in the vibration part of the vibration absorbing actuator 3 are respectively pressed and fixed through the vibration absorbing actuator housing 2 and the flexible hinge A1, and the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4. Specifically: the membrane spring A7 is pressed and fixed between the flexible hinge A1 and the vibration absorbing actuator housing 2 through the fasteners between the flexible hinge A1 and the vibration absorbing actuator housing 2; the membrane spring B13 is pressed and fixed between the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4 through the fasteners between the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4. Thus, one end of the vibration absorbing actuator base 4 is connected to the vibration absorbing actuator housing 2, compressing the membrane spring B13 in the vibration absorbing actuator 3, and the other end is connected to the flexible hinge B6 through the stud of the flexible hinge B6, compressing the force sensor 5.

[0054] The connecting bolt 11 passes through the diaphragm spring B13, the through hole of the voice coil motor stator 12, the center hole of the voice coil motor mover 9, and the diaphragm spring A7 from bottom to top, and is then locked by a nut; the limit block A8 is mounted on the connecting bolt 11, and the limit block A8 is located between the voice coil motor mover 9 and the diaphragm spring A7, with one end abutting against the upper end surface of the voice coil motor mover 9 and the other end abutting against the lower end surface of the diaphragm spring A7, thereby the upper and lower ends of the diaphragm spring A7 are respectively pressed by the nut and the limit block A8 to prevent it from being in a suspended state. The limit block B10 is also mounted on the connecting bolt 11, and the limit block B10 is located between the voice coil motor mover 9 and the membrane spring B13, with one end in contact with the lower end surface of the voice coil motor mover 9 and the other end in contact with the upper end surface of the membrane spring B13; the nut part of the connecting bolt 11 contacts the lower end surface of the membrane spring B13 through the pad, so that the upper and lower ends of the membrane spring B13 are respectively pressed by the limit block B10 and the nut of the connecting bolt 11 to prevent it from being in a suspended state. Therefore, when the voice coil motor mover 9 moves axially, the two membrane springs and the two limit blocks are connected through the connecting bolt 11 to form the vibration part of the vibration absorbing actuator 3, and the two limit blocks can be processed integrally with the voice coil motor mover 9.

[0055] When the voice coil motor mover 9 moves axially, the two diaphragm springs are deformed, and the axial actuating force generated by the voice coil motor mover 9 is transmitted to the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4 through the diaphragm springs.

[0056] The vibration-absorbing principle of the active vibration-absorbing support rod is as follows: flexible hinges are used at both ends, and the bending stiffness of the two lateral directions of the flexible hinges perpendicular to the axial direction of the support rod is much lower than the axial stiffness, so that the support rod is mechanically equivalent to a "two-force rod" that only transmits axial force. The original disturbance axial force on the support rod is measured by the force sensor 5 and transmitted to the controller; the controller drives the vibration-absorbing actuator 3 to generate axial forces with equal amplitude and opposite phase. The axial force generated by the vibration-absorbing actuator 3 is transmitted to the vibration-absorbing actuator housing 2 through two membrane springs, and the two axial forces converge at the force sensor 5 to offset the original disturbance axial force and achieve the purpose of vibration isolation (i.e., to prevent the original disturbance axial force from being transmitted to the base structure).

[0057] In the above-mentioned active vibration-absorbing support rod, the flexible hinge A1 and the flexible hinge B6 provide low bending stiffness in two directions perpendicular to the axial direction, so that the active vibration-absorbing support rod is equivalent to a two-force rod in mechanics; the force sensor 5 measures at least the axial force information, and the vibration-absorbing actuator 3 provides an axial actuating force under the drive of an external controller. The force sensor 5, the vibration-absorbing actuator 3, and the controller form a closed-loop control system of the axial force.

[0058] Preferably, the flexible hinge A1, the flexible hinge B6, the vibration absorbing actuator housing 2, and the vibration absorbing actuator base 4 are all made of metal; and the sensitive element inside the force sensor 5 is made of piezoelectric material.

[0059] Embodiment 2:

[0060] Based on the above-mentioned embodiment 1, a vibration reduction system having the ability to maintain spatial accuracy is provided.

[0061] like Figure 3 As shown, the vibration reduction system includes: N (N≥3) active vibration reduction support rods 300, an adapter corner box 200, and a controller 400; a device that meets the spatial accuracy maintenance requirements and has small vibrations during operation, namely, a disturbance source 100, is installed at the upper end of the vibration reduction system, and the lower end is connected to the spacecraft base structure.

[0062] According to the vibration reduction requirements, N active vibration reduction support rods 300 are arranged at a set spatial angle (through the layout of multiple active vibration reduction support rods 300, the forces in various directions can be offset), and the angle relationship between the disturbance source 100 and the spacecraft infrastructure is ensured by the adapter angle box 200. Specifically: one end of the active vibration reduction support rod 300 is connected to the disturbance source 100 through the adapter angle box 200, and the other end is connected to the spacecraft infrastructure through the adapter angle box 200. During the ground installation stage, the adapter angle box 200 is adjusted by rotation, pad adjustment gaskets, reprocessing, etc. until the installation position and accuracy of the disturbance source 100 meet the requirements. The adapter angle box connects the disturbance source 100 and the infrastructure, and the accuracy adjustment of the disturbance source 100 is achieved through the adjustment of the adapter angle box 200, and the accuracy of the position and angle of the disturbance source 100 is maintained through the high stiffness characteristics of the vibration reduction system. Each active vibration reduction support rod 300 is electrically connected to the controller 400 through two cables.

[0063] The working principle of the vibration reduction system is: each force sensor 5 measures the original disturbing axial force of its own vibration reduction active support rod 300 and feeds back the information to the controller 400; the controller 400 controls the vibration part in the vibration absorbing actuator 3 to vibrate up and down, generating an axial actuating force with the same amplitude and opposite phase as the original disturbing axial force; the axial actuating force of the vibration absorbing actuator 3 is transmitted to the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4 through the diaphragm spring, and then transmitted to the force sensor 5, thereby offsetting the original disturbing force and achieving the purpose of vibration reduction.

[0064] Ground parking, assembly, testing, experiment, launch flight phase: The mechanical load transfer path of the disturbance source 100 through the vibration reduction system is: disturbance source 100->device end adapter corner box->flexible hinge A1->vibration absorbing actuator housing 2, vibration absorbing actuator base 4->force sensor 5->flexible hinge B6->infrastructure end adapter corner box->satellite / camera infrastructure, such as Figure 4 As shown; the transmission links of the mechanical load are all rigid elements, and there is no flexible low-rigidity deformation link in the axial direction. Through the design of each component, the rigidity of the combination of the disturbance source 100 and the vibration reduction system can be guaranteed, and the position and direction accuracy requirements of the disturbance source 100 can be guaranteed.

[0065] During the on-orbit flight phase, when the vibration reduction system is not working, the transmission path of the disturbance force of the disturbance source 100 is: disturbance source 100->device end adapter corner box->flexible hinge A1->vibration absorption actuator housing 2, vibration absorption actuator base 4->force sensor 5->flexible hinge B6->infrastructure end adapter corner box->satellite / camera infrastructure, the force sensor 5 on each vibration reduction support rod 300 measures the axial disturbance force transmitted by the disturbance source 100 through the support rod, and the measurement information is transmitted to the controller 400.

[0066] When the vibration reduction system is working, the disturbance force information collected by the force sensor 5 is transmitted to the controller 400. The controller 400 controls the vibration absorbing actuator 3 to generate an axial reaction force with equal amplitude and opposite phase. The reaction force is transmitted to the vibration absorbing actuator housing 2 and the vibration absorbing actuator base 4 through the membrane spring, and then transmitted to the force sensor 5 to offset the disturbance force, thereby reducing the disturbance force collected by the force sensor 5.

[0067] like Figure 5 As shown, this embodiment provides a vibration reduction system with six active vibration cancellation support rods 300, and the six active vibration cancellation support rods 300 are grouped in pairs and divided into three groups; the three groups of active vibration cancellation support rods 300 are evenly spaced along the circumferential direction; one end of the two active vibration cancellation support rods 300 in each group is set at an angle of 60° to the spacecraft base structure through the adapter angle box 200, and the other end is connected to the same position of the disturbance source 100 through the adapter angle box 200, so that the angle between the axis lines of the two active vibration cancellation support rods 300 in each group is also 60°.

[0068] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An active vibration-absorbing support rod capable of maintaining spatial accuracy, characterized in that: include: A flexible hinge A (1), a flexible hinge B (6), a vibration absorbing actuator housing (2), a vibration absorbing actuator base (4), a vibration absorbing actuator (3) and a force sensor (5); One axial end of the vibration absorbing actuator housing (2) is connected to the vibration source via a flexible hinge A (1), and the other end is connected to the vibration absorbing actuator base (4); The force sensor (5) is pressed between the flexible hinge B (6) and the vibration absorbing actuator base (4); the force sensor (5) has a preload force; the force sensor (5) is used to collect axial force information and transmit it to an external controller; The flexible hinge B (6) is connected to the base structure; A vibration absorbing actuator (3) is installed inside the vibration absorbing actuator housing (2), and the vibration absorbing actuator (3) is used to generate an axial force under the action of a controller to offset the disturbing axial force of the disturbance source; The vibration absorbing actuator (3) comprises: a voice coil motor mover (9), a voice coil motor stator (12) and a vibration force transmission component; The voice coil motor mover (9) is capable of moving in the axial direction; The voice coil motor stator (12) is fixedly connected to the vibration absorbing actuator housing (2) and is electrically connected to an external controller; The vibration force transmission component is fixedly connected to the voice coil motor mover (9) to transmit the axial actuating force generated by the voice coil motor mover (9) to the vibration absorbing actuator housing (2) and the vibration absorbing actuator base (4); The vibration force transmission component comprises: a diaphragm spring A (7), a diaphragm spring B (13), a limit block A (8), a limit block B (10) and a connecting bolt (11); The membrane spring A (7) is installed between the flexible hinge A (1) and the vibration absorbing actuator housing (2); the membrane spring B (13) is installed between the vibration absorbing actuator housing (2) and the vibration absorbing actuator base (4); The connecting bolt (11) passes through the diaphragm spring B (13), the voice coil motor stator (12), the voice coil motor mover (9), and the diaphragm spring A (7) in sequence from bottom to top and is then locked by a nut; The upper and lower ends of the membrane spring A (7) are respectively pressed by nuts and limit blocks A (8) sleeved on the connecting bolts (11); The upper and lower ends of the membrane spring B (13) are respectively tightened by a limit block B (10) sleeved on the connecting bolt (11) and a nut of the connecting bolt (11).

2. The active vibration-absorbing support rod with spatial precision maintenance capability according to claim 1, characterized in that: The force sensor (5) is sleeved on the stud on the upper end surface of the flexible hinge B (6); the portion of the stud that passes through the force sensor (5) is locked with the vibration absorbing actuator base (4) by a nut, so that the force sensor (5) is pressed between the flexible hinge B (6) and the vibration absorbing actuator base (4); and a pre-tightening force is applied to the force sensor (5) by the nut.

3. The active vibration-absorbing support rod with spatial precision maintenance capability according to claim 1, characterized in that: The limit block A (8), the limit block B (10) and the voice coil motor mover (9) are processed integrally.

4. The active vibration-absorbing support rod with spatial precision maintenance capability according to claim 1, characterized in that: The flexible hinge A (1), the flexible hinge B (6), the vibration absorbing actuator housing (2), and the vibration absorbing actuator base (4) are all made of metal.

5. The active vibration-absorbing support rod with spatial precision maintenance capability according to claim 1, characterized in that: The internal sensitive element of the force sensor (5) is made of piezoelectric material.

6. A vibration reduction system, characterized in that: include: More than three active vibration-absorbing support rods; the active vibration-absorbing support rods are the active vibration-absorbing support rods with spatial accuracy maintenance capability as described in any one of claims 1 to 5 above, and the three or more active vibration-absorbing support rods are arranged between the disturbance source and the base structure at a set spatial angle; the three or more active vibration-absorbing support rods are electrically connected to the controller respectively.

7. The vibration reduction system according to claim 6, characterized in that: One end of the active vibration-absorbing support rod is connected to the disturbance source through a switching angle box, and the other end is connected to the foundation structure through a switching angle box.

8. The vibration reduction system according to claim 6, characterized in that: It comprises six active vibration-absorbing support rods; the six active vibration-absorbing support rods are arranged in groups of two; the three groups of active vibration-absorbing support rods are evenly spaced along the circumferential direction; one end of the two active vibration-absorbing support rods in each group is connected to the base structure at a set angle through a transfer angle box, and the other end is connected to the same position of the disturbance source through a transfer angle box.

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