Broadband, frequency-selective bellows fluid damper strut for suppressing satellite vibrations

Abstract

The application discloses a wide-band and frequency-selective bellows fluid vibration-reducing strut for inhibiting satellite vibration and relates to the technical field of spacecraft vibration isolation and noise reduction. The application comprises a piston assembly, a main bellows assembly, an auxiliary bellows assembly, a main-auxiliary bellows connecting flange, a sealing ring, silicon oil, a machined spring assembly, an upper connecting piece assembly, a middle connecting piece and a lower connecting piece assembly. Two sets of the main bellows assembly are arranged above and below the piston assembly, and are connected to the piston assembly by bolts and nuts through the first flange of the piston assembly. The sealing ring is arranged between the two sets of the main bellows assembly and the piston assembly. The technical scheme provided by the application provides a high-efficiency, wide-band and frequency-selective bellows fluid vibration-reducing strut for a satellite system, protects a precise payload or structure in the active section, and improves the working quality of the precise payload and the satellite in the on-orbit section.

Description

Technical Field

[0001] This invention belongs to the field of spacecraft vibration isolation and noise reduction. Specifically, it relates to a broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration. Background Technology

[0002] To prevent damage to precision payloads or structures on satellites during the active phase and to improve their operational quality in orbit, or to prevent their micro-vibrations from significantly contributing to the structural noise of manned spacecraft cabins, vibration isolation is required for these precision payloads or structures. Since vibration isolators face a random, broadband, large-amplitude environment during the active phase, and a random, high-frequency energy-dominated micro-amplitude environment in orbit, high-performance and environmentally adaptable requirements are placed on the stiffness and damping of the vibration isolators.

[0003] The bellows fluid damper used for vibration isolation in spacecraft originated from the two-parameter D-Strut damper developed by Honeywell Corporation for NASA in the early days. Later, with technological advancements, three-parameter dampers with buffer cavities were proposed, as described in European patent documents EP0623763B1 and EP2518366B1 and Chinese patent documents CN104632989B and CN104389943B. Compared with two-parameter dampers, three-parameter dampers have significantly improved vibration isolation performance in the high-frequency range, but their vibration isolation performance in the low-frequency range, including the resonance peak region, has not improved.

[0004] To address the shortcomings of passive vibration isolators, especially in the low-frequency range, integrated active-passive vibration isolation solutions have been proposed and researched. For example, patent document CN115897837A proposes a vibration isolator scheme that combines bellows liquid damping with a voice coil motor actuator. A significant drawback of integrated active-passive vibration isolators in aerospace engineering is the need for power supplies, sensors, controllers, and other equipment, which significantly increases the complexity of the vibration isolation system and reduces its reliability.

[0005] To develop a reliable, highly efficient, wideband, environmentally adaptable bellows fluid damper capable of suppressing satellite vibrations, key technical challenges remain to be addressed, including: 1. Existing bellows fluid dampers almost all use a fixed damping orifice, which limits the damper's bandwidth and results in poor vibration isolation performance in the low-frequency range, including the resonance peak region. Therefore, it is necessary to design better and more adaptable hydraulic dampers.

[0006] 2. Existing bellows fluid dampers are mainly designed for the micro-vibration environment of the track section, and rarely take into account the environment of the active section or other conditions on the track section such as unlocking impacts and low-frequency swaying of inertial devices. Therefore, in addition to designing better and more adaptable hydraulic dampers, it is also necessary to design stiffness with good linearity and adaptability.

[0007] In view of this, the present invention is proposed. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration.

[0009] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration includes a piston assembly, a main bellows assembly, a secondary bellows assembly, main and secondary bellows connecting flanges, sealing rings, silicone oil, a machined spring assembly, an upper connecting component assembly, an intermediate connecting component, and a lower connecting component assembly. Two main bellows assemblies are located above and below the piston assembly, and each is connected to the piston assembly via its first flange by bolts and nuts. Sealing rings are provided between each of the two main bellows assemblies and the piston assembly. The first flanges of the two secondary bellows assemblies are then connected to the second flanges of the two main bellows assemblies via the two main and secondary bellows connecting flanges, respectively, by bolts and nuts. Sealing rings are provided between each main bellows assembly and the connecting flange, and between each connecting flange and the secondary bellows assembly. Symmetrical sealed cavities are formed on the upper and lower sides of the piston assembly. Each sealed cavity is divided into a main cavity corresponding to the main bellows assembly, a buffer cavity corresponding to the secondary bellows assembly, and a fluid channel connecting the main cavity and the buffer cavity formed between the secondary bellows assembly and the connecting flange of the main and secondary bellows.

[0010] Optionally, silicone oil is filled into the sealed cavities above and below the piston assembly as a working medium.

[0011] Optionally, two sets of intermediate connecting parts are connected to the main and auxiliary bellows connecting flanges located above and below the piston assembly by bolts and nuts at their upper and lower ends, respectively, in a symmetrical arrangement. The upper connecting part assembly is located above the intermediate connecting parts, with its middle part connected to the piston assembly by screws, and its lower part connected to the retaining ring in the machined spring assembly by screws.

[0012] Optionally, the lower connecting component assembly is located below the middle connecting component, and its upper part is connected to the main and auxiliary bellows connecting flange located below the piston assembly by bolts and nuts; the machined spring assembly is located inside the lower connecting component assembly, and its lower end is connected to the lower connecting component assembly by screws, and its upper end retaining ring is connected to the lower part of the upper connecting component assembly by screws.

[0013] Optionally, the piston assembly includes a piston, a fixed damping orifice, and a frequency valve. A fixed damping orifice is machined in the middle of the piston as the main damping orifice, and the length-to-diameter ratio of the main damping orifice conforms to the category of thick-walled small orifices, i.e., 0.5. <l / d≤4。

[0014] Optionally, the frequency valve includes a valve seat, a valve core, and a valve core spring. Several frequency valves are evenly or symmetrically distributed around the fixed damping orifice. The number of frequency valves, their normally open or normally closed form, and valve parameters are optimized according to the requirements of the specific vibration isolation system.

[0015] Optionally, the main bellows assembly includes a main bellows, a first flange of the main bellows, and a second flange of the main bellows. The first flange and the second flange are designed to be offset by 90° in orientation. The main bellows is connected to the first flange and the second flange by welding. The secondary bellows assembly includes a secondary bellows, a first flange of the secondary bellows, a second flange of the secondary bellows, and a volume adjustment end cap. The volume adjustment end cap is located above the secondary bellows and is connected to the second flange of the secondary bellows by screws. A sealing ring is provided between the volume adjustment end cap and the second flange of the secondary bellows. The secondary bellows is connected to its first flange and the second flange by welding.

[0016] Optionally, the machined spring assembly includes a machined spring and a retaining ring. The machined spring is in the form of a slotted spring. In its natural state, the force-bearing part of the retaining ring is located in the middle position of the upper slot of the slotted spring. The gaps between the upper and lower surfaces of the retaining ring and the slotted spring are equal. The gap amount is optimized according to the vibration isolation system.

[0017] Optionally, the upper connector assembly includes an upper connector body and a connecting screw with a flexible hinge. The connecting screw with the flexible hinge is coated with thread adhesive and is threadedly connected and fastened to the upper connector body. Optionally, the lower connector assembly includes a lower connector body and a connecting screw. After applying thread-locking adhesive, the connecting screw is fastened to the upper connector body via a threaded connection.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: The "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" designed in this invention is installed between the isolated load or structure and the foundation. In the active phase, where random, low-frequency, large-amplitude energy predominates, it provides high stiffness and high damping; in the orbital phase, where random, high-frequency, small-amplitude energy predominates, it provides low stiffness and low damping. For large payloads, a locking mechanism is typically used in the active phase to improve reliability. Under this condition, this invention can continuously adapt to and meet the compression requirements of the locking state. Furthermore, when the payload is unlocked and released in the orbital phase, it can efficiently mitigate the impact energy of the payload. After the payload is put into normal operation, it can significantly suppress micro-vibrations between the load and the foundation. Therefore, the technical solution proposed in this invention provides a highly efficient, broadband, frequency-selective bellows fluid vibration damping support for satellite systems, protecting precision payloads or structures in the active phase and improving the operational quality of precision payloads and satellites in the orbital phase.

[0019] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is an isometric view of the external appearance of the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0021] Figure 2 This is a top view of the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0022] Figure 3 This is the invention "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibrations". Figure 2 AA cross-section view.

[0023] Figure 4 This is a top view of the piston assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0024] Figure 5 This is the invention "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibrations". Figure 4 BB cross-section.

[0025] Figure 6 This is a schematic diagram comparing the mechanical model of the "broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration" of the present invention with the existing two-parameter and three-parameter damper mechanical models.

[0026] Figure 7 This is a schematic diagram comparing the vibration transmissibility curve of the "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention with the vibration transmissibility curves of existing two-parameter and three-parameter dampers.

[0027] Figure 8 This is a schematic diagram of the main bellows assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0028] Figure 9 This is a schematic diagram of the sub-bellows assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0029] Figure 10 This is a schematic diagram of the main and auxiliary bellows connecting flanges in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0030] Figure 11 This is a schematic diagram of the machined spring assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0031] Figure 12 This invention relates to a "wideband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration". Figure 11 A schematic diagram of the middle retaining ring.

[0032] Figure 13 This is a schematic diagram of the upper connecting component assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0033] Figure 14 This is a schematic diagram of the intermediate connecting component in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0034] Figure 15 This is a schematic diagram of the lower connecting component assembly in the "Broadband, Frequency Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" of the present invention.

[0035] Figure 16 This is an axonometric view of the invention "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Highly Efficiently Suppressing Satellite Vibration", and a schematic diagram of the overall structure after being cut in half. The attached diagram lists the components represented by each number as follows: 1. Upper connecting component assembly; 11. Connecting screw with flexible hinge; 12. Upper connecting component body; 2. Intermediate connecting component; 3. Lower connecting component assembly; 31. Connecting screw; 32. Lower connecting component body; 4. Secondary bellows assembly; 41. Secondary bellows; 42. Secondary bellows first flange; 43. Secondary bellows second flange; 44. Volume adjustment end cap; 5. Main and secondary bellows connecting flange; 6. Sealing ring; 7. Main bellows assembly; 71. Main bellows; 72. Main bellows first flange; 73. Main bellows second flange; 8. Piston assembly; 81. Piston 82. Fixed damping orifice; 83. Frequency valve; 831. Valve core; 832. Valve core spring; 833. Valve seat; 9. Machining spring assembly; 91. Machining spring; 92. Snap ring; 101. Lower buffer chamber; 102. Upper buffer chamber; 131. Lower fluid channel; 132. Upper fluid channel; 141. Lower main chamber; 142. Upper main chamber; 15. Silicone oil; 16. Two-parameter damper mechanical model; 17. Three-parameter damper mechanical model; 18. Mechanical model of "Broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration".

[0036] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Implementation

[0037] The invention will now be described in further detail with reference to the accompanying drawings.

[0038] Please see Figure 1-16 As shown, this embodiment provides a broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration, including a piston assembly 8, a main bellows assembly 7, a secondary bellows assembly 4, a main and secondary bellows connecting flange 5, a sealing ring 6, silicone oil 15, a machined spring assembly 9, an upper connecting component assembly 1, an intermediate connecting component 2, and a lower connecting component assembly 3.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 10 and Figure 16Two main bellows assemblies 7 are distributed above and below the piston assembly 8, and are each connected to the piston assembly 8 by bolts and nuts via their first flanges 72. A sealing ring 6 is provided between each of the two main bellows assemblies 7 and the piston assembly 8. The first flanges 42 of the two auxiliary bellows assemblies 4 are then connected to the second flanges 73 of the two main bellows assemblies 7 via two sets of main and auxiliary bellows connecting flanges 5, respectively, by bolts and nuts. A sealing ring 6 is provided between each set of main bellows assemblies 7 and the main / auxiliary bellows connecting flanges 5, and between the main / auxiliary bellows connecting flanges 5 and the auxiliary bellows assembly 4. Thus, symmetrical sealed cavities are formed above and below the piston assembly 8 in the above assembly. The upper sealing cavity is divided into an upper main cavity 142 corresponding to the main bellows assembly 8, an upper buffer cavity 102 corresponding to the secondary bellows assembly 4, and an upper fluid channel 132 formed between the secondary bellows assembly 4 and the main / secondary bellows connecting flange 5, connecting the upper main cavity 142 and the upper buffer cavity 102. The lower sealing cavity is divided into a lower main cavity 141 corresponding to the main bellows assembly 8, a lower buffer cavity 101 corresponding to the secondary bellows assembly 4, and a lower fluid channel 131 formed between the secondary bellows assembly 4 and the main / secondary bellows connecting flange 5, connecting the lower main cavity 141 and the lower buffer cavity 101. Preferably, silicone oil 15 is filled into the sealing cavities above and below the piston assembly 8 as the working medium.

[0040] See Figure 1 , Figure 2 , Figure 3 , Figure 10 , Figure 14 and Figure 16 Two sets of intermediate connecting parts 2 are connected at their upper and lower ends to the main and auxiliary bellows connecting flanges 5 located above and below the piston assembly 8 by bolts and nuts, respectively, and are arranged symmetrically on the left and right. The upper connecting part assembly 1 is located above the intermediate connecting parts 2, and its middle part is connected to the piston assembly 8 by screws, and its lower part is connected to the retaining ring 92 in the machined spring assembly 9 by screws. The lower connecting part assembly 3 is located below the intermediate connecting parts 2, and its upper part is connected to the main and auxiliary bellows connecting flanges 5 located below the piston assembly 8 by bolts and nuts. The machined spring assembly 9 is located inside the lower connecting part assembly 3, and its lower end is connected to the lower connecting part assembly 3 by screws, and its upper end retaining ring 92 is connected to the lower part of the upper connecting part assembly 1 by screws.

[0041] join Figure 4 and Figure 5, the piston assembly 8 comprises a piston 81, a fixed orifice 82 and a frequency valve 83. Preferably, a fixed orifice 82 is formed in the middle of the piston 81 as a main orifice, and the aspect ratio of the main orifice falls within the category of thick-walled small holes, i.e., 0.5<l / d≤4; the frequency valve 83 comprises a valve spool 831, a spool spring 832 and a valve seat 833. Preferably, a plurality of frequency valves 83 are evenly distributed circumferentially or symmetrically around the fixed orifice 82, and the number, normally open or normally closed configuration, and valve parameters of the frequency valves 83 can be optimally designed according to the requirements of a specific vibration isolation system.

[0042] See Figure 8 , the main bellows assembly 7 comprises a main bellows 71, a main bellows first flange 72 and a main bellows second flange 73. Preferably, the first flange 72 and the second flange 73 are designed with a 90° misalignment in orientation, which facilitates the overall design of the damping strut, and the main bellows 71 is connected with the first flange 72 and the second flange 73 by welding.

[0043] See Figure 9 , the auxiliary bellows assembly 4 comprises an auxiliary bellows 41, an auxiliary bellows first flange 42, an auxiliary bellows second flange 43 and a volume adjusting end cap 44, the volume adjusting end cap 44 is located above the auxiliary bellows 41 and connected with the auxiliary bellows second flange 43 by screws, a sealing ring 6 is provided between the volume adjusting end cap 44 and the auxiliary bellows second flange 43. Preferably, the auxiliary bellows 41 is connected with the auxiliary bellows first flange 42 and the auxiliary bellows second flange 43 by welding.

[0044] See Figure 11 and Figure 12 , the machined spring assembly 9 comprises a machined spring 91 and a snap ring 92. Preferably, the machined spring 91 adopts a transverse groove spring configuration, in a natural state, the force-bearing part of the snap ring 92 is located at the middle position in the upper clamping groove of the transverse groove spring, and the gaps between the upper and lower surfaces of the snap ring and the transverse groove spring are equal, and the gap amount can be optimally designed according to the situation of a specific vibration isolation system.

[0045] See Figure 13 and Figure 15 , the upper connecting member assembly 1 comprises an upper connecting member body 12 and a connecting screw with flexible hinge 11. Preferably, the connecting screw with flexible hinge 11 is coated with thread locking adhesive and is fastened with the upper connecting member body 12 through threaded connection; the lower connecting member assembly 3 comprises a lower connecting member body 32 and a connecting screw 31. Preferably, after being coated with thread locking adhesive, the connecting screw 31 is fastened with the lower connecting member body 32 through threaded connection.

[0046] See Figure 6The mechanical model in this embodiment consists of a three-parameter damper with variable damping and a secondary stiffness element with a gap element connected in parallel. Compared with the existing three-parameter damper mechanical model, it not only provides adaptively variable damping but also adaptively variable stiffness. Therefore, this embodiment achieves wide-bandwidth and high-performance vibration isolation performance in a passive manner, improving the reliability of the satellite system.

[0047] See Figure 7 In this embodiment, a combination of fixed damping holes 82 and several frequency valves 83 on the piston 81 is designed as a variable hydraulic damping system. This not only significantly reduces the vibration transmission rate of the vibration isolator in the low-frequency range, especially in the resonance peak region, but also allows for further reduction of the vibration transmission rate in the high-frequency range as needed. This makes this embodiment have adaptable and high-performance hydraulic damping over a wide frequency band. At the same time, a machined spring with excellent linearity is designed as a second-level stiffness, which enables this embodiment to adapt to and meet the vibration and impact environment of the satellite at different stages.

[0048] The "Broadband, Frequency-Selective Bellows Fluid Vibration Damping Support for Suppressing Satellite Vibration" designed in this invention is installed between the isolated load or structure and the foundation. In the active phase, where random, low-frequency, large-amplitude energy predominates, it provides high stiffness and high damping; in the orbital phase, where random, high-frequency, small-amplitude energy predominates, it provides low stiffness and low damping. For large payloads, a locking mechanism is typically used in the active phase to improve reliability. Under this condition, this invention can continuously adapt to and meet the compression requirements of the locking state. Furthermore, when the payload is unlocked and released in the orbital phase, it can efficiently mitigate the impact energy of the payload. After the payload is put into normal operation, it can significantly suppress micro-vibrations between the load and the foundation. Therefore, the technical solution proposed in this invention provides a highly efficient, broadband, frequency-selective bellows fluid vibration damping support for satellite systems, protecting precision payloads or structures in the active phase and improving the operational quality of precision payloads and satellites in the orbital phase.

[0049] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0050] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration, comprising a piston assembly, a main bellows assembly, a secondary bellows assembly, a main and secondary bellows connecting flange, a sealing ring, silicone oil, a machined spring assembly, an upper connecting component assembly, an intermediate connecting component, and a lower connecting component assembly, characterized in that: Two sets of main bellows assemblies are distributed above and below the piston assembly, and are connected to the piston assembly by bolts and nuts through their first flanges. A sealing ring is provided between the two sets of main bellows assemblies and the piston assembly. The first flanges of the two sets of auxiliary bellows assemblies are then connected to the second flanges of the two sets of main bellows assemblies by bolts and nuts through two sets of main and auxiliary bellows connecting flanges. A sealing ring is provided between each set of main bellows assemblies and connecting flanges, and between each connecting flange and auxiliary bellows assembly. Symmetrical sealed cavities are formed on the upper and lower sides of the piston assembly. Each sealed cavity is divided into a main cavity corresponding to the main bellows assembly, a buffer cavity corresponding to the secondary bellows assembly, and a fluid channel connecting the main cavity and the buffer cavity formed between the secondary bellows assembly and the main and secondary bellows connecting flanges. The piston assembly includes a piston, a fixed damping orifice, and a frequency valve. A fixed damping orifice, serving as the main damping orifice, is machined in the middle of the piston. The length-to-diameter ratio of the main damping orifice conforms to the category of thick-walled small orifices, specifically 0.

5. <l / d≤4; The machined spring assembly includes a machined spring and a retaining ring. The machined spring is a slotted spring. In its natural state, the force-bearing part of the retaining ring is located in the middle of the upper slot of the slotted spring. The gaps between the upper and lower surfaces of the retaining ring and the slotted spring are equal. The gap amount is optimized according to the vibration isolation system.

2. The broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, Silicone oil is filled into the sealed cavities above and below the piston assembly as the working medium.

3. The broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, Two sets of intermediate connecting parts are connected to the main and auxiliary bellows connecting flanges located above and below the piston assembly by bolts and nuts at their upper and lower ends, respectively, and are arranged symmetrically from left to right. The upper connecting part assembly is located above the intermediate connecting parts, and its middle part is connected to the piston assembly by screws, while its lower part is connected to the retaining ring in the machined spring assembly by screws.

4. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 3, characterized in that, The lower connecting component assembly is located below the middle connecting component, and its upper part is connected to the main and auxiliary bellows connecting flanges located below the piston assembly by bolts and nuts; the machined spring assembly is located inside the lower connecting component assembly, and its lower end is connected to the lower connecting component assembly by screws, and its upper end retaining ring is connected to the lower part of the upper connecting component assembly by screws.

5. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, The frequency valve includes a valve seat, a valve core, and a valve core spring. Several frequency valves are evenly or symmetrically distributed around a fixed damping orifice. The number of frequency valves, their normally open or normally closed form, and valve parameters are optimized according to the requirements of the specific vibration isolation system.

6. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, The main bellows assembly includes a main bellows, a first flange of the main bellows, and a second flange of the main bellows. The first flange and the second flange are offset by 90° in orientation. The main bellows is connected to the first flange and the second flange by welding. The secondary bellows assembly includes a secondary bellows, a first flange of the secondary bellows, a second flange of the secondary bellows, and a volume adjustment end cap. The volume adjustment end cap is located above the secondary bellows and is connected to the second flange of the secondary bellows by screws. A sealing ring is provided between the volume adjustment end cap and the second flange of the secondary bellows. The secondary bellows is connected to its first flange and the second flange by welding.

7. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, The upper connector assembly includes an upper connector body and a connecting screw with a flexible hinge. The connecting screw with the flexible hinge is coated with thread adhesive and is threadedly connected and fastened to the upper connector body.

8. A broadband, frequency-selective bellows fluid vibration damping support for suppressing satellite vibration according to claim 1, characterized in that, The lower connector assembly includes a lower connector body and a connecting screw. After the connecting screw is coated with thread-locking adhesive, it is fastened to the upper connector body by thread.

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