A method for preparing a composite vibration damper of high-pressure metal fiber sintered body and metal plate

Abstract

This invention discloses a method for preparing a composite vibration damper consisting of a high-pressure-bearing sintered metal fiber body and a metal plate, belonging to the technical field of composite vibration dampers. By controlling factors such as the diameter, porosity, and thickness of stainless steel fibers, and through high-temperature sintering and pressure forming, this invention obtains a stable, high-compressive-strength stainless steel felt sintered body (SFB). The metal plate is then combined with the SFB to fully utilize the vibration damping energy of the SFB, resulting in a high-pressure-bearing metal fiber vibration damper. This vibration damper exhibits high compressive strength and excellent vibration damping performance, and also possesses characteristics such as corrosion resistance, high-temperature resistance, machinability, and strong environmental adaptability.

Description

Technical Field

[0001] This invention belongs to the field of composite vibration damper technology, and particularly relates to a method for preparing a composite vibration damper of high-pressure metal fiber sintered body and metal plate. Background Technology

[0002] Underwater vehicles operating in deep waters experience significant water pressure. Simultaneously, the combined effects of water, internal mechanics, and various complex loads generate strong, broadband vibrations, impacting the vehicle's performance. Large machinery also faces high pressure requirements for vibration damping, such as the tracks in rail transit systems. Currently, vibration damping methods used in these environments typically employ springs or damped rubber, but these methods suffer from limitations such as single-frequency vibration reduction and rubber aging or failure. Therefore, research into vibration dampers that withstand high pressure, are resistant to aging, and are corrosion-resistant is urgently needed.

[0003] Currently, typical damping and vibration reduction materials are polymer rubbers. They have advantages such as large damping loss factor, wide-band vibration reduction, excellent vibration reduction effect, and wide application range. However, they are difficult to apply under harsh conditions, such as high temperature, oil stains, light exposure, and long-term use. They are also prone to aging and will lose their vibration reduction effect under high pressure or heavy load conditions.

[0004] A typical structural vibration reduction method is spring vibration damping. Its principle is to design the spring's resonant frequency to be far removed from the resonant frequency of the isolation body, thus minimizing vibration transmissibility. The spring dissipates energy when vibrating at non-resonant frequencies, thereby achieving a vibration reduction effect. Its advantages include high effectiveness for single-frequency vibrations, simple structure, and ease of implementation. Its disadvantages include the inability to achieve broadband vibration reduction and its ineffectiveness against complex vibrations.

[0005] Currently, the most advanced spring damping material is metal rubber. Metal rubber is made of elastic metal wires, typically stainless steel wires, with a wire diameter on the order of millimeters. It is manufactured by hand weaving and molding. When vibration energy is transferred to the metal rubber, it causes dry friction between the metal wires, thus attenuating the vibration energy. The structure of metal rubber is a complex spring woven from multiple metal wires, which has greater damping than ordinary springs and attenuates more vibration energy. Therefore, metal rubber has superior vibration damping performance compared to ordinary springs. However, the disadvantages of metal rubber are still that its damping is relatively small, which cannot be compared with polymer rubber. It cannot achieve a truly wide-frequency vibration damping effect, but it is effective for single-frequency or narrow-band vibration damping, and cannot achieve vibration damping performance similar to that of rubber. Moreover, because metal rubber is hand-woven and cold-processed, its performance is subject to change over time and with environmental temperature, resulting in poor product stability.

[0006] In practice, complex and broadband vibrations are frequently encountered, making broadband vibration reduction even more significant. Under special and harsh environmental conditions, such as underwater, high-load, high-temperature, corrosive, and complex broadband vibration environments, rubber materials, springs, and metal-rubber composites cannot achieve excellent vibration reduction. Therefore, it is essential to develop vibration reduction materials with high damping and excellent environmental tolerance.

[0007] Among numerous materials, stainless steel fiber is currently the best choice for achieving high performance through the design of high-damping structures. Stainless steel fiber possesses high strength, wear resistance, and bending resistance. It maintains its original properties even after prolonged exposure to high-temperature oxygen environments of 400-500℃. It is completely resistant to acids, alkalis, and organic solvents and can be used for extended periods in harsh environments, making it a fiber material with excellent performance. Stainless steel fiber can be processed through molding, sintering, and other processes to produce products with stable properties, ensuring performance in practical applications.

[0008] Stainless steel fibers can be fabricated into sintered stainless steel fiber felt (SFB), whose internal structure consists of a large number of fibers stacked together. Due to the presence of numerous fibers inside, under the action of external forces, the force is transmitted to the fibers, causing friction between the fibers and thus dissipating energy. Therefore, this structure is a high-friction structure with a strong ability to dissipate energy and has high damping characteristics; it is referred to here as a high-damping structure.

[0009] However, although SFB has relatively high damping characteristics, its microstructure consists of randomly distributed fibers. SFB is a discontinuous material with gaps between fibers, forming a multi-layered network or porous structure. This structure limits vibration transmission, meaning it is unfavorable for vibration transmission. Therefore, some fibers may be effective while others are not. The disadvantages of SFB are: (a) If the external vibration area is small and the contact area with the SFB is small, the transmitted vibration area is small, meaning only some fibers are effective, while most fibers are inactive and cannot receive vibration. This prevents the SFB from performing its intended function, resulting in poor vibration damping. The problem of ensuring sufficient external vibration is transmitted into the SFB needs to be addressed; (b) Although SFB has a porous structure and its strength is much higher than ordinary rubber, the issue of high strength still needs to be addressed for very high pressure conditions. Summary of the Invention

[0010] To address the problems existing in the prior art, this invention proposes a method for preparing a composite vibration damper of high-pressure-bearing metal fiber sintered body and metal plate.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A high-pressure-bearing composite vibration damper of sintered metal fiber body and metal plate is disclosed. The composite vibration damper is composed of sintered metal fiber body and metal plate. The filament diameter of the raw material of the sintered metal fiber body is 3-22 micrometers, and the porosity of the sintered metal fiber body is 67-71%. The sintered metal fiber body refers to sintered stainless steel fiber felt.

[0013] Because micron-sized fibers have a large specific surface area, the frictional area between fibers is enormous, ensuring high damping performance. In contrast, metal rubber uses millimeter-sized filaments, which cannot achieve high friction or high damping structures. Regarding the effect of stainless steel fiber diameter on damping, the smaller the diameter, the greater the damping. This is because smaller diameter fibers have a large specific surface area, providing a large frictional area. A larger area of ​​fiber frictional contact results in greater energy attenuation, thus achieving high damping performance. Currently, stainless steel fiber diameters can be mass-produced down to 3 microns, but this is expensive. Therefore, the stainless steel fiber diameter range of this invention is between 3 and 22 microns, but is not limited to this range.

[0014] Porosity is a key parameter controlling compressive strength. Higher porosity results in lower compressive strength, while lower porosity leads to higher compressive strength. Therefore, based on requirements, the porosity must first meet the actual compressive strength requirements, and then a smaller stainless steel fiber diameter should be selected; that is, a smaller diameter results in greater damping. This invention is used in an underwater vehicle at a depth of 1000m, thus requiring a compressive strength of 10MPa. Based on calculations and actual tests, the porosity must be within the range of 67-71% to meet the compressive strength requirement. If higher compressive strength is needed, a smaller porosity is required. Porosity is a necessary condition for providing inter-fiber friction. Higher porosity results in more voids within the SFB (sulfuric acid fiber), providing space for fiber friction. Therefore, the effects of porosity on compressive strength and damping performance are contradictory; higher porosity results in lower compressive strength but better damping performance. Therefore, the selection of porosity is mainly based on environmental conditions, i.e., the influence of environmental pressure must be considered first.

[0015] The metal fiber sintered body in this invention can also be used as a shock absorber. The preparation method of the metal fiber sintered body includes the following steps: raw stainless steel short fibers are randomly and uniformly laid, initially pressed, and sintered at 1100±10℃ for 3±0.5h. Then, according to the porosity requirements, they are subjected to secondary pressing to obtain SFB samples.

[0016] Furthermore, the thickness of the metal fiber sintered body is 8-16 mm. The thinner the SFB plate, the better the vibration damping performance, but the load-bearing capacity is reduced; therefore, the thickness of the SFB plate is generally not less than 8 mm. There are no special requirements for the SFB thickness; it depends on actual needs.

[0017] Furthermore, the thickness of the metal plate is 1-15 mm. Thinner metal plates offer better vibration damping performance but reduce pressure resistance; therefore, this invention limits the metal plate thickness to generally between 1-15 mm. The plate thickness can be determined based on the actual environment.

[0018] Furthermore, the metal plate includes one of stainless steel, steel, aluminum, fiberglass, and titanium. Different materials can be selected for applications in different environments, depending on the environmental requirements.

[0019] This invention also provides a method for preparing the aforementioned high-pressure-bearing metal fiber sintered body and metal plate composite vibration damper, comprising the following steps: connecting the metal fiber sintered body to the metal plate, placing the object to be damped on the surface of the metal fiber sintered body, and ensuring that the vibration originates from one side of the metal plate, thus achieving the damping effect. This vibration damper features high compressive strength, corrosion resistance, high temperature resistance, machinability, and strong environmental adaptability. The metal fiber sintered body and metal plate can be used in a unit structure stacked together, i.e., multi-layer combination, or in a single-layer combination.

[0020] Because vibrations propagate easily in solids, and in dense metal materials where the microscopic atomic arrangement is continuous, vibrations are easily transmitted through interatomic collisions with minimal energy dissipation. Therefore, dense metals generally have very low damping, but their advantage lies in their effective vibration transmission. This invention utilizes the characteristic of metal plates to effectively transmit vibrations by combining SFB (Solid Forming Brick) with a titanium plate. This allows external vibrations to be transmitted to the SFB, enabling it to perform better vibration damping.

[0021] Furthermore, the connection method between the SFB and the metal plate can be adhesive bonding, welding, or bolting. The advantage of bolting the SFB and metal plate is easy disassembly and maintenance. The composite of the titanium plate and SFB must be tightly bonded; the larger the contact area, the more vibration is transmitted through the metal plate to the SFB, and the greater the effect of the SFB. This is the principle behind how the metal plate can improve the vibration damping performance of the SFB.

[0022] To further enhance the damping effect of SFB (Self-Damping Brick), lubricating oil can be added dropwise, such as by adding machine oil to the SFB surface, thereby obtaining SFB with higher vibration reduction characteristics. The amount of lubricating oil added is 20-100% of the SFB porosity volume.

[0023] Because of the numerous interlayered and interconnected fibers in the SFB structure, overall movement is easily induced under high pressure, thus weakening the friction between fibers and preventing the damping from being fully utilized. It's crucial to overcome the misconception about frictional damping. The common idea is to increase pressure or surface roughness, which, while improving damping performance, ignores relative motion. For SFB structures, without relative motion, friction cannot occur, meaning energy cannot be dissipated, and therefore damping cannot be achieved. Friction, or damping, only manifests when fibers move relative to each other. If the load pressure is high, the fibers in the SFB are compressed, reducing the opportunity for relative motion and weakening friction, thus reducing damping; in extreme cases, there is no frictional resistance. Therefore, only with sufficient mutual movement between fibers can friction be generated, resulting in higher damping. Treating SFB with lubricating oil can effectively increase the relative motion between stainless steel fibers, causing relative slippage under force, increasing frictional movement, achieving higher damping, and thus improving vibration reduction.

[0024] The present invention also provides an application of the aforementioned high-pressure metal fiber sintered body and metal plate composite vibration damper in underwater vehicles.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] (1) The present invention controls the stainless steel fiber diameter, porosity and thickness, and obtains a high compressive strength stainless steel felt sintered body-SFB with stable performance by high temperature sintering and pressure forming.

[0027] (2) By combining metal plates with SFB, the vibration reduction energy of SFB is fully utilized to obtain a high-pressure metal fiber vibration damper, namely, an SFB-metal plate composite vibration damper.

[0028] (3) The vibration damper prepared by the present invention has high compressive strength and excellent vibration damping performance, and has the characteristics of corrosion resistance, high temperature resistance, machinability and strong environmental adaptability. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the composite vibration damper unit made of metal fiber sintered body and metal plate prepared according to an embodiment of the present invention. Detailed Implementation

[0031] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0032] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0033] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0034] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0035] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0036] Unless otherwise specified, "room temperature" in this invention refers to 25±2℃.

[0037] All raw materials used in the following embodiments of the present invention are commercially available.

[0038] This invention provides a high-pressure-bearing composite vibration damper made of sintered metal fiber and metal plate. The composite vibration damper is composed of sintered metal fiber and metal plate. The filament diameter of the raw material of the sintered metal fiber is 3-22 micrometers, preferably 6 micrometers. The porosity of the sintered metal fiber is 67-71%, preferably 68-70%. The sintered metal fiber refers to sintered stainless steel fiber felt.

[0039] In some preferred embodiments of the present invention, the thickness of the metal fiber sintered body is 8-16 mm, preferably 10-16 mm.

[0040] In some preferred embodiments of the present invention, the thickness of the metal plate is 1-15 mm, preferably 1-2 mm.

[0041] In some preferred embodiments of the present invention, the metal plate includes one of stainless steel plate, steel plate, aluminum plate, fiberglass plate, and titanium plate. Titanium plate is preferred.

[0042] This invention also provides a method for preparing the aforementioned high-pressure-bearing metal fiber sintered body and metal plate composite vibration damper, comprising the following steps: connecting the metal fiber sintered body to the metal plate, placing the object to be damped on the surface of the metal fiber sintered body, and ensuring that the vibration originates from one side of the metal plate, thus achieving the damping effect. This vibration damper features high compressive strength, corrosion resistance, high temperature resistance, machinability, and strong environmental adaptability. The metal fiber sintered body and metal plate can be used in a unit structure stacked together, i.e., multi-layer combination, or in a single-layer combination.

[0043] To further enhance the damping effect of SFB (Self-Damping Brick), lubricating oil can be added dropwise, such as by adding machine oil to the SFB surface, thereby obtaining SFB with higher vibration reduction characteristics. The amount of lubricating oil added is 20-100% of the SFB porosity volume.

[0044] The following embodiments further illustrate the technical solution of the present invention. Taking a titanium plate as an example, the structure is a combination of a sintered metal fiber body and a single layer of metal plate. Figure 1 This is a schematic diagram of the composite vibration damper unit made of metal fiber sintered body and metal plate prepared according to an embodiment of the present invention.

[0045] Example 1 – 10.38mmSFB

[0046] Stainless steel short fibers with a diameter of 6μm and an average fiber length of 30mm were used as raw materials. The raw materials were randomly and uniformly laid, initially pressed (pressure 5±0.1MPa), and sintered at 1100±10℃ for 3±0.5h. After sintering, according to the porosity requirements, a second pressing was performed (pressure 13±0.1MPa) to obtain a plate with a porosity of 70.1%. After machining, a sample of SFB with a thickness of 10.38mm and a diameter of 31cm was obtained.

[0047] The SFB sample was tested and found to have a compressive strength of 11.2 MPa and a vibration level drop of 21.2 dB in the 0-6000 Hz frequency range. Since the SFB structure is composed of fibers, it dissipates energy through inter-fiber friction under cyclic loads, thus providing vibration damping. Therefore, SFB itself can be used as a vibration damper.

[0048] Example 2 – 13.28mmSFB

[0049] The preparation method of the SFB sample is the same as in Example 1, except that it is subjected to secondary pressing (pressure of 14±0.1MPa) to obtain an SFB sample with a porosity of 68.6% and a thickness of 13.28mm.

[0050] The test results showed that the compressive strength of the SFB sample was 11.3 MPa, and the vibration level drop was 17.5 dB in the frequency range of 0-6000 Hz.

[0051] Example 3 – 15.12mmSFB

[0052] The preparation method of the SFB sample is the same as in Example 1, except that it is subjected to secondary pressing (pressure of 14±0.1MPa) to obtain an SFB sample with a porosity of 69.6% and a thickness of 15.12mm.

[0053] The test results showed that the compressive strength of the SFB sample was 11.5 MPa, and the vibration level drop was 18.3 dB in the frequency range of 0-6000 Hz.

[0054] Example 4 – 10.38mm SFB + 1.2mm Ti

[0055] The SFB plate prepared in Example 1 was combined with a titanium plate of type TC4, which had a thickness of 1.2 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0056] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 27.4 dB in the 0-6000 Hz range, which is 6.2 dB higher than the vibration level drop of 21.2 dB of the SFB prepared in Example 1 in the 0-6000 Hz range, representing an improvement rate of 29.2%.

[0057] Example 5 – 10.38mm SFB + 1.5mm Ti

[0058] The SFB plate prepared in Example 1 was combined with a titanium plate of type TC4, which had a thickness of 1.5 μm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0059] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 26.7 dB in the 0-6000 Hz range, which was 5.5 dB higher than the vibration level drop of 21.2 dB of the SFB prepared in Example 1 in the 0-6000 Hz range, representing an improvement rate of 25.9%.

[0060] Example 6 – 10.38mm SFB + 1.9mm Ti

[0061] The SFB plate prepared in Example 1 was combined with a titanium plate of type TC4, which had a thickness of 1.9 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0062] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 25.9 dB in the 0-6000 Hz range, which was 4.7 dB higher than the vibration level drop of 21.2 dB of the SFB prepared in Example 1 in the 0-6000 Hz range, representing an improvement rate of 22.2%.

[0063] Example 7 – 13.3mm SFB + 1.2mm Ti

[0064] The SFB plate prepared in Example 2 was combined with a titanium plate of type TC4, which had a thickness of 1.2 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0065] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 25.2 dB in the 0-6000 Hz range, which was 7.7 dB higher than the vibration level drop of 17.5 dB of the SFB prepared in Example 2 in the 0-6000 Hz range, representing an improvement rate of 44.0%.

[0066] Example 8 – 13.3mm SFB + 1.5mm Ti

[0067] The SFB plate prepared in Example 2 was combined with a titanium plate of type TC4, which had a thickness of 1.5 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0068] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 27.1 dB in the 0-6000 Hz range, which was 9.6 dB higher than the vibration level drop of 17.5 dB of the SFB prepared in Example 2 in the 0-6000 Hz range, representing an improvement rate of 54.9%.

[0069] Example 9 – 13.3mm SFB + 1.9mm Ti

[0070] The SFB plate prepared in Example 2 was combined with a titanium plate of type TC4, which had a thickness of 1.9 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0071] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 26.1 dB in the 0-6000 Hz range, which is 8.6 dB higher than the vibration level drop of 17.5 dB of the SFB prepared in Example 2 in the 0-6000 Hz range, representing an improvement rate of 49.1%.

[0072] Example 10 – 15.1mm SFB + 1.2mm Ti

[0073] The SFB plate prepared in Example 3 was combined with a titanium plate of type TC4, which had a thickness of 1.2 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0074] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 24.4 dB in the 0-6000 Hz range, which was 6.1 dB higher than the vibration level drop of 18.3 dB of the SFB prepared in Example 3 in the 0-6000 Hz range, representing an improvement rate of 33.3%.

[0075] Example 11 – 15.1mm SFB + 1.5mm Ti

[0076] The SFB plate prepared in Example 3 was combined with a titanium plate of type TC4, which had a thickness of 1.5 mm and a density of 4.5 g / cm³. 3 The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0077] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 24.6 dB in the 0-6000 Hz range, which was 6.3 dB higher than the vibration level drop of 18.3 dB of the SFB prepared in Example 3 in the 0-6000 Hz range, representing an improvement rate of 33.4%.

[0078] Example 12 – 15.1mm SFB + 1.9mm Ti

[0079] The SFB plate prepared in Example 3 was combined with a titanium plate of type TC4, which had a thickness of 1.9 mm and a density of 4.5 g / cm³. 3The SFB and Ti plates are tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0080] Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 22.6 dB in the 0-6000 Hz range, which was 4.3 dB higher than the vibration level drop of 18.3 dB of the SFB prepared in Example 3 in the 0-6000 Hz range, representing an improvement rate of 23.5%.

[0081] Comparative Example 1

[0082] Currently used vibration-damping metal plates generally employ a thicker or heavier design, providing a certain level of vibration damping performance. This comparative example selects a 2A12 aluminum alloy plate as the vibration-damping material, with a thickness of 28mm and a density of 2.7g / cm³. 3 .

[0083] The results of comparing the vibration level drop of the vibration damping material in this comparative example with that of the SFB-Ti composite vibration dampers prepared in Examples 4-12 are shown in Table 1.

[0084] Table 1 Vibration level drop test results

[0085]

[0086] Example 13

[0087] 1) No. 32 lubricating oil was added to the SFB plate prepared in Example 1, with the amount added being 60% (volume percentage) of the SFB void volume, to obtain an oiled SFB sample. The compressive strength of this SFB sample was tested to be 11.2 MPa, and its vibration level drop in the 0-6000 Hz range was 25.6 dB. Compared with the vibration level drop (21.2 dB) of the SFB prepared in Example 1 in the 0-6000 Hz range, this represents an increase of 4.4 dB, or 20.8%.

[0088] 2) The obtained SFB sample was combined with a TC4 titanium plate (1.9 mm thick) using bolts to tightly connect the SFB and the Ti plate, forming an SFB-Ti composite vibration damper structure. Testing showed that the SFB-Ti composite vibration damper prepared in this embodiment had a vibration level drop of 33.3 dB in the 0-6000 Hz range, which is 7.4 dB higher than the vibration level drop (25.9 dB) of the SFB prepared in Example 6 in the 0-6000 Hz range, representing an improvement of 28.6%.

[0089] Comparative Example 2

[0090] Similar to Example 1, except that stainless steel short fibers with a diameter of 20 μm and an average fiber length of 30 mm were used as raw materials to obtain an SFB sample with a porosity of 70.1% and a thickness of 10.38 mm.

[0091] The obtained SFB sample was combined with a TC4 titanium plate with a thickness of 1.9 mm. The SFB and Ti plates were tightly connected using bolts to form an SFB-Ti composite vibration damper structure. Testing showed that the SFB sample exhibited a small vibration level drop, and the composite vibration damper also exhibited a small vibration level drop. This is because, for SFB samples with the same porosity and thickness, a finer wire diameter results in a larger specific surface area, providing a larger friction area. A larger area of ​​fiber friction contact leads to greater energy attenuation, thus improving the overall damping and vibration reduction performance of the material. Therefore, selecting a finer wire diameter is more reasonable to achieve high damping vibration reduction. Therefore, in this invention, short stainless steel fibers with a wire diameter of 6 μm are used.

[0092] Comparative Example 3

[0093] Similar to Example 1, except that the pressure of the secondary pressing was controlled at 16 MPa, resulting in an SFB sample with a porosity of 65% and a thickness of 10.38 mm.

[0094] Porosity is a significant factor affecting compressive strength. This invention is used in an underwater vehicle at a depth of 1000m, thus requiring a compressive strength of 10MPa. Based on calculations and actual tests, the porosity must be within the range of 67-71% to meet the compressive strength requirement. If higher compressive strength is needed, a lower porosity is required. Porosity is essential for providing inter-fiber friction; the higher the porosity, the more voids within the SFB (fiber-free fiber composite), providing space for fiber friction. Therefore, the effects of porosity on compressive strength and damping performance are contradictory; high porosity results in poor compressive strength but good damping performance. Therefore, the selection of porosity is primarily based on environmental conditions, i.e., the influence of environmental pressure is considered first. The sample prepared according to this comparative example clearly does not meet the application environment of this invention.

[0095] Comparative Example 4

[0096] Similar to Example 1, except that an SFB sample with a porosity of 70.1% and a thickness of 6 mm was obtained after processing.

[0097] The thinner the SFB plate, the better its vibration damping performance. However, in practical applications, the load-bearing capacity of a thinner plate will be affected, and the bending strength of the sample prepared using this comparative example will decrease. Therefore, this invention sets the thickness of the SFB plate to be no less than 8 mm.

[0098] Comparative Example 5

[0099] The SFB sample obtained in Example 1 was combined with a titanium plate of model TC4 with a thickness of 0.8 mm. The SFB and Ti plate were tightly connected by bolts to form an SFB-Ti composite vibration damper structure.

[0100] The titanium plate serves to increase overall strength and transmit vibration energy; its thickness ranges from 1 to 15 mm. For ordinary pressure applications, a thinner titanium plate generally provides better vibration damping. However, in deep-sea diving, a thinner titanium plate reduces its pressure-bearing capacity, leading to a decrease in the bending strength of the composite vibration damper prepared using this comparative example. Therefore, this invention limits the metal plate thickness to generally between 1 and 15 mm.

[0101] In summary, to overcome the shortcomings of low damping and narrow frequency band vibration reduction of metal rubber, as well as the limitations of ordinary rubber such as inability to be used under high pressure conditions and aging, the present invention proposes the following approach: Utilizing a sintered stainless steel fiber body with a high damping structure, this invention achieves high damping, wide frequency band vibration reduction, and the ability to be used under high pressure conditions.

[0102] (1) By controlling factors such as the diameter, porosity and thickness of stainless steel fibers, high-temperature sintering and pressure forming are used to obtain a high-compressive-strength stainless steel felt sintered body with stable performance -SFB.

[0103] (2) By combining metal plates with SFB, the vibration reduction energy of SFB is fully utilized to obtain a high-pressure metal fiber vibration damper, namely, an SFB-metal plate composite vibration damper.

[0104] (3) The vibration damper prepared by the present invention has high compressive strength and excellent vibration damping performance, and has the characteristics of corrosion resistance, high temperature resistance, machinability and strong environmental adaptability.

[0105] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A composite vibration damper of high-pressure-bearing metal fiber sintered body and metal plate, characterized in that, The composite vibration damper is composed of a metal fiber sintered body and a layered metal plate; the porosity of the metal fiber sintered body is 67-71%, the thickness is 8-16 mm, and the filament diameter of the raw material of the metal fiber sintered body is 3-22 micrometers. The metal fiber sintered body is a stainless steel fiber felt sintered body; The preparation method of the metal fiber sintered body includes the following steps: after randomly and uniformly laying the raw stainless steel short fibers, primary pressing and high-temperature sintering, secondary pressing and molding are carried out according to the porosity requirements to obtain a stainless steel fiber felt sintered body sample; the high-temperature sintering is sintering at 1100±10℃ for 3±0.5h. The thickness of the metal plate is 1-15 mm; The metal plate includes one of steel plate, aluminum plate and titanium plate; The preparation method of the composite vibration damper of the high pressure bearing metal fiber sintered body and metal plate includes the following steps: connecting the metal fiber sintered body to the metal plate, placing the object to be damped on the surface of the metal fiber sintered body, and the vibration coming from one side of the metal plate.

2. A method for preparing a composite vibration damper of high-pressure-bearing metal fiber sintered body and metal plate as described in claim 1, characterized in that, The preparation method includes the following steps: connecting a metal fiber sintered body to a metal plate, placing the object to be damped on the surface of the metal fiber sintered body, and the vibration coming from one side of the metal plate.

3. The preparation method according to claim 2, characterized in that, The connection method includes one of adhesive bonding, welding, and bolting.

4. The application of the composite vibration damper of high pressure-bearing metal fiber sintered body and metal plate as described in claim 1 as a vibration damper in underwater vehicles.

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