Pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper

Abstract

The present invention provides a pipeline dynamic vibration absorption system based on magnetorheological elastomers and particle dampers. The system is fixed to a pipeline structure and includes a vibration damping device and a support for fixing to the pipeline. The vibration damping device includes a magnetic component and a force transmission device; the magnetic component and the force transmission device work together to control pipeline vibration. This pipeline dynamic vibration absorption system significantly improves the system's broadband vibration absorption capability and overall vibration absorption efficiency. The addition of particle dampers to the system absorbs energy and amplifies the amplitude, effectively resolving the difficulty of activating vibrations with a single particle damper. Furthermore, the system is more adaptable to the environment, ensuring efficient performance in various vibration environments.

Description

Technical Field

[0001] The present invention belongs to the field of vibration absorption technology, and in particular relates to a pipeline dynamic vibration absorption system based on a magnetorheological elastomer and a particle damper. Background Art

[0002] Pipeline systems, as an essential component for the flow, transportation, and transmission of fluids, are widely used in construction applications such as water supply and drainage, as well as in industries such as petrochemicals, machinery, and military services. However, due to the operation of nearby machinery and the fluid flow conditions within the pipelines, pipeline vibrations are unavoidable. Pipeline vibration not only generates noise pollution but also causes metal fatigue over time. In severe cases, it can damage nearby machinery, leading to complete system failure and potentially serious accidents. Therefore, research on vibration control in pipeline systems is necessary.

[0003] Dynamic vibration absorbers are the most commonly used vibration reduction devices for pipelines. Based on their operating principles and control methods, dynamic vibration absorbers can be divided into three types: active, passive, and semi-active. Passive dynamic vibration absorbers provide good vibration reduction when their natural frequency is equal to the external excitation frequency. However, since their natural frequency cannot be adjusted, their vibration reduction frequency band is relatively narrow. In contrast, active dynamic vibration absorbers can effectively reduce vibration over a wider frequency range, but their actuators require a larger energy input, are more complex in structure, and require higher control precision.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper, which can realize continuous adjustment of the vibration absorption frequency band of the pipeline dynamic vibration absorption system; at the same time, it makes up for the disadvantage of difficulty in vibration initiation when a single particle damper is used as a vibration absorber, broadens the vibration absorption frequency of the dynamic vibration absorber, and improves the vibration absorption efficiency of the vibration absorber.

[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0007] The present invention provides a pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper, which is fixed on the pipeline structure and includes: a vibration reduction device and a support for fixing on the pipeline. The vibration reduction device includes a magnetic component and a force transmission device; the magnetic component and the force transmission device work together to control pipeline vibration.

[0008] Preferably, as a further specific embodiment, the magnetic component includes a particle damper and a magnetically conductive pipe clamp, and the magnetically conductive pipe clamp is an open type; the magnetically conductive pipe clamp is wrapped around the outside of the particle damper, and the particle damper and the magnetically conductive pipe clamp are connected through a force conduction device; and the number of the force conduction devices is ≥3.

[0009] In the present invention, a force transmission device is used to connect the particle damper and the magnetically conductive pipe clamp, while also transferring the load from the magnetically conductive pipe clamp to the particle damper. The present invention sets a limit on the number of force transmission devices. If the number of force transmission devices is too small, excessive force concentration can easily lead to particle damper fracture.

[0010] A particle damper is a device that uses the collision and friction of particles within a structure's cavity to provide a damping effect, thereby suppressing structural vibration. This is primarily based on the nonlinear behavior of particles during vibration. When a structure vibrates due to external excitation, the particles filling the cavity follow the movement, dissipating the vibration energy through collision and friction between the particles, thereby suppressing the vibration. This damping effect is derived not only from the mass of the particles themselves, but also from the energy dissipated during their movement.

[0011] Preferably, as a further specific implementation, the magnetic assembly further comprises an excitation coil, which is wound around the outer surface of the magnetically conductive pipe clamp; and high-damping particles are arranged in the inner cavity of the particle damper.

[0012] The excitation coil helps the vibration damping system generate a stable and uniform magnetic field, which creates a magnetic flux circuit between the magnetically permeable pipe clamp and the magnetorheological elastomer. By varying the current in the excitation coil, the magnetic field strength of the magnetorheological elastomer is controlled, thereby varying its shear modulus and elastic modulus, enabling precise control of the dynamic vibration absorber's natural frequency. The high-damping particles are spherical, and by adjusting their size and quantity, the particle damper's energy dissipation performance can be optimized, improving vibration absorption efficiency.

[0013] Magnetorheological elastomers (MREs) are intelligent composite materials formed by dispersing micron- or nanometer-sized ferromagnetic particles within a polymer matrix and curing them in a magnetic field. Their unique properties, such as modulus, stiffness, and damping, can rapidly and reversibly change in response to an applied magnetic field. Compared to MR fluids, MREs offer greater stability, avoiding issues like magnetic particle sedimentation and thus eliminating the need for additional sealing devices to maintain consistent performance.

[0014] Preferably, as a further specific embodiment, the magnetic component also includes a magnetorheological elastomer, which is connected to the outer surface of the particle damper and the support; the inner walls of the openings on both sides of the magnetically conductive tube clamp are connected to the support through the magnetorheological elastomer; the number of the magnetorheological elastomers is ≥3.

[0015] In the present invention, there are at least three magnetorheological elastomers, two of which are positioned on the inner walls of the openings on either side of the magnetically conductive pipe clamp and connected to the support. The stiffness of the pipeline dynamic vibration absorption system varies by the magnetorheological elastomers. Simultaneously, when the current changes, the operating mode of the magnetorheological elastomers changes, enabling the natural frequency of the pipeline dynamic vibration absorption system to track the external excitation frequency, dissipating energy through resonance and transferring the amplitude to the vibration damping unit. The particle damper in the vibration damping unit further dissipates energy through mutual collision and friction between the damping particles, thereby improving the vibration absorption capacity and efficiency of the vibration damping system.

[0016] Preferably, as a further specific implementation manner, the excitation coil is wound in an equidistant manner; and the filling rate of the high-damping particles is ≤75%.

[0017] In this invention, varying the number of particles in the damper cavity can also alter the mass of the vibration damping device, further enhancing its adaptability and flexibility. Furthermore, by incorporating a particle damper into a dynamic vibration absorber, the absorber absorbs energy and amplifies the amplitude, effectively resolving the difficulty of activating vibrations with a single particle damper.

[0018] Preferably, as a further specific embodiment, the support is fixed to the pipe clamp by a fixing device, the pipe clamp, the vibration damping device and the support for fixing to the pipe constitute a vibration damping unit, the vibration damping units are fixed to each other by the fixing device, and multiple vibration damping units constitute the vibration damping system; the number of the vibration damping units is ≥3.

[0019] The number of vibration reduction units is ≥3, thereby ensuring that vibration energy from different vibration directions can be better absorbed, thereby improving vibration reduction efficiency.

[0020] The present invention also provides a working method of a pipeline dynamic vibration absorption system based on a magnetorheological elastomer and a particle damper, comprising the following steps:

[0021] receiving pipeline vibration, tracking the frequency of the pipeline vibration, and adjusting the natural frequency of the pipeline dynamic vibration absorption system according to the frequency of the external vibration of the pipeline;

[0022] It then resonates with the pipeline and transmits the amplitude to the pipeline dynamic vibration absorption system for vibration reduction.

[0023] Preferably, as a further specific implementation, the magnetic component block adopts a hybrid working mode;

[0024] When the pipeline vibrates horizontally, the magnetorheological elastomer connected to the particle damper is in a shear mode, and the magnetorheological elastomer connected to the magnetically conductive pipe clamp is in a tension-compression mode;

[0025] When the pipeline vibrates axially, the magnetorheological elastomer connected to the particle damper is in a tension-compression mode, and the magnetorheological elastomer connected to the magnetically conductive pipe clamp is in a shear mode.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The pipeline dynamic vibration absorption system adopted by the present invention uses magnetorheological elastomers as the stiffness elements of the dynamic vibration absorption system, which are respectively installed between the support and the magnetically conductive pipe clamp and between the support and the particle damper. This design allows the stiffness of the pipeline dynamic vibration absorption system to be adjusted in real time as needed. By changing the current in the excitation coil, the magnetic field strength of the magnetorheological elastomer can be controlled, thereby changing its operating mode, achieving precise regulation of the natural frequency of the pipeline dynamic vibration absorption system, enabling it to closely track the external excitation frequency and achieve the best vibration reduction effect.

[0028] (2) The particle damper used in the present invention is composed of a cylindrical damper cavity and high-damping spherical particles. By adjusting the size and number of the damping particles, the energy dissipation performance of the damper can be optimized and the vibration absorption efficiency can be improved. At the same time, changing the number of particles in the damper cavity can also achieve a variable mass design of the pipeline dynamic vibration absorption system, further enhancing its adaptability and flexibility. In addition, by adding the particle damper to the pipeline dynamic vibration absorption system, the pipeline dynamic vibration absorption system absorbs energy and amplifies the amplitude, effectively solving the problem of difficulty in vibration initiation of a single particle damper vibration absorber.

[0029] (3) The present invention uses a mixed working mode: in response to the different types of vibrations that the pipeline may be subjected to (such as horizontal radial vibration, vertical radial vibration and axial vibration), the magnetorheological elastomer in the present invention adopts a mixed working mode to cope with it. During horizontal radial vibration, the magnetorheological elastomer connected to the pipe clamp is in tension and compression mode, while the one connected to the particle damper is in shear mode; the opposite is true during vertical radial vibration; during axial vibration, all magnetorheological elastomers are in shear mode. In the tension and compression working mode, the storage modulus and loss modulus of the magnetorheological elastomer are both improved, but the damping loss factor is relatively small. This means that in the tension and compression mode, the magnetorheological elastomer can store and dissipate energy more effectively. Therefore, compared with the pipeline dynamic vibration absorption system that only uses the shear mode of the magnetorheological elastomer, the pipeline dynamic vibration absorption system of the present invention can better adapt to the environment and ensure the high efficiency of the pipeline dynamic vibration absorption system in various vibration environments.

[0030] (4) When the pipeline is subjected to external excitation, the pipeline dynamic vibration absorption system can track and adjust its natural frequency in real time to match the excitation frequency. Vibration energy is transferred to the particle damper in the pipeline dynamic vibration absorption system through resonance. Inside the damper, the mutual collision and friction between the high-damping spherical particles effectively dissipate the vibration energy, thereby significantly improving the broadband vibration absorption capacity and overall vibration absorption efficiency of the pipeline dynamic vibration absorption system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 : A schematic structural diagram of a pipeline dynamic vibration absorption system according to an embodiment of the present invention;

[0033] Figure 2 : A schematic structural diagram of a vibration reduction device and a support according to an embodiment of the present invention;

[0034] Figure 3 : A schematic structural diagram of a particle damper according to an embodiment of the present invention.

[0035] Among them: 1-pipe clamp, 2-support, 3-spring, 4-force transmission connecting plate, 5-magnetic pipe clamp, 6-particle damper, 601-particle damper cavity, 602-high damping particles, 7-excitation coil, 8-bolt, 9-magnetorheological elastomer, 10-bolt. DETAILED DESCRIPTION

[0036] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[0037] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] In order to more clearly illustrate the technical solutions of the present invention, specific embodiments are provided below for illustration.

[0040] Example

[0041] See Figure 1-3 The present invention provides a pipeline dynamic vibration absorption system based on magnetorheological elastomers and particle dampers. The pipeline dynamic vibration absorption system is fixed to the surface of the pipeline to be damped using bolts 10. In an embodiment of the present invention, three vibration damping units and three magnetorheological elastomers 9 are set; a force transmission connecting plate 7 is used as a force conduction device, and the number of force conduction devices is 3.

[0042] In this embodiment, the pipeline dynamic vibration absorption system is structured as follows: an open-type magnetic pipe clamp 5 is wrapped around the outside of a particle damper 6. Excitation coils 7 are wound equidistantly around the outer surface of the magnetic pipe clamp 5. The particle damper cavity 601 within the particle damper 6 is filled with 50% high-damping particles 602. Three force-transmitting connecting plates 7 are positioned between the particle damper 6 and the magnetic pipe clamp 5 to transfer the load generated by the magnetic pipe clamp 5 to the particle damper 6, allowing the particle damper 6 to absorb vibrations generated by the pipeline. A magnetorheological elastomer 9 is installed at the junction between the outer surface of the particle damper 6 and the support 2. The inner opening of the magnetic pipe clamp 5 is connected to the support 2 via the magnetorheological elastomer 9. A spring 3 has one end connected to the outer surface of the magnetic pipe clamp 5 and the other end fixed to the support 2. The support 2 is secured to the pipe clamp 1 via bolts 8. The above arrangement forms a vibration damping unit. In this embodiment, three vibration damping units are used and connected to each other via bolts 10 .

[0043] The specific working mode of the pipeline dynamic vibration absorption system in the present invention is as follows:

[0044] Direct current is passed through the excitation coil 7, generating a magnetic field. A magnetic flux loop is created between the magnetorheological elastomer 9 and the magnetic pipe clamp 5. When the pipeline to be damped vibrates, the spring 3 within the pipeline dynamic vibration absorption system resonates with the pipeline's vibration. The spring 3 then transmits the vibration signal to the magnetorheological elastomer 9, which is connected to the support 2 at the opening of the magnetic pipe clamp 5. The vibration signal is simultaneously transmitted to the magnetic pipe clamp 5 and then to the particle damper 6 via the force transmission connecting plate 4 positioned between the magnetic pipe clamp 5 and the particle damper 6. Upon receiving the vibration signal, the high-damping particles 602 within the particle damper cavity 601 within the particle damper 6 collide and rub against each other based on the generated vibration signal, thereby dissipating the vibration energy. Simultaneously, as the vibration changes, the current and magnetic field change accordingly, thereby altering the elastic modulus and shear modulus of the magnetorheological elastomer 9, thereby controlling the natural frequency of the pipeline dynamic vibration absorption system.

[0045] The MR elastomer 9 has a certain damping effect, dissipating energy and reducing vibration generated by the pipeline. It also controls the natural frequency of the dynamic vibration absorption system based on changes in the magnetic field, improving the pipeline dynamic vibration absorption system's broadband absorption capability and overall vibration absorption efficiency. During horizontal radial vibration, the MR elastomer connected to the pipe clamp operates in tension-compression mode, while that connected to the particle damper operates in shear mode. The opposite is true during vertical radial vibration; during axial vibration, all MR elastomers operate in shear mode.

[0046] In the present invention, by varying the current in the excitation coil 7, the magnetic field strength surrounding the magnetorheological elastomer 9 can be controlled, thereby changing the operating mode of the pipeline dynamic vibration absorption system. During the vibration reduction process, the magnetorheological elastomer 9 can also adjust the stiffness of the pipeline dynamic vibration absorption system based on actual current changes, thereby improving the stiffness and strength of the pipeline dynamic vibration absorption system, thereby increasing its load-bearing capacity and durability, and significantly extending its service life.

[0047] During actual use, the magnitude of the direct current is adjusted at any time according to the magnitude of the vibration, thereby adjusting the magnetic field strength. This allows the magnetorheological elastomer to change its elastic modulus and shear modulus by varying the size of the magnetic flux loop. This can alter the stiffness and strength of the pipeline dynamic vibration absorption system, while simultaneously changing the shear modulus and elastic modulus of the magnetorheological elastomer to track the absorber's natural frequency to the external excitation frequency. Furthermore, this change is rapidly reversible. Compared to magnetorheological fluids, magnetorheological elastomers offer greater stability and avoid problems such as magnetic particle sedimentation, thus maintaining stable performance without the need for additional sealing devices. During application, the number of force transmission devices, magnetorheological elastomers, and vibration damping units can be selected based on conditions such as pipeline size, installation location, and pipeline shape.

[0048] The number of the above devices is preferably ≥3. This arrangement can maximize the acceptance of forces from different directions, thereby achieving better vibration reduction effects.

[0049] The filling amount of high-damping particles can be selected according to actual conditions, but the filling amount should not be greater than 75%. The high-damping particles inside the particle damper further consume energy through collision and friction with each other. When the filling amount is too large, it is easy to cause the particle damper to be difficult to vibrate, thereby reducing the vibration reduction effect.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipeline dynamic vibration absorption system based on magnetorheological elastomers and particle dampers, fixed on the pipeline structure, characterized by: include: A vibration damping device and a support for fixing to a pipeline, wherein the vibration damping device comprises a magnetic component and a force conducting device; The magnetic component and the force transmission device work together to control pipeline vibration; The magnetic assembly includes a particle damper and a magnetically conductive pipe clamp, wherein the magnetically conductive pipe clamp is open; the magnetically conductive pipe clamp is wrapped around the outside of the particle damper, and the particle damper and the magnetically conductive pipe clamp are connected by a force transmission device; and the number of the force transmission devices is ≥3; The magnetic assembly further includes an excitation coil, which is wound around the outer surface of the magnetically conductive pipe clamp; The magnetic component also includes a magnetorheological elastomer, which is connected to the outer surface of the particle damper and the support; the inner walls of the openings on both sides of the magnetically conductive pipe clamp are connected to the support through the magnetorheological elastomer; the number of the magnetorheological elastomers is ≥3.

2. The pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper according to claim 1 is characterized in that: High-damping particles are arranged in the inner cavity of the particle damper.

3. The pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper according to claim 2 is characterized in that: The excitation coil is wound in an equidistant manner; and the filling rate of the high-damping particles is ≤75%.

4. The pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper according to claim 1 is characterized in that: The particle damper is cylindrical.

5. The pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper according to claim 1 is characterized in that: The support is fixed to the pipe clamp via a fixing device. The pipe clamp, the vibration damping device and the support for fixing to the pipe constitute a vibration damping unit. The vibration damping units are fixed to each other via the fixing device. A plurality of the vibration damping units constitute the vibration absorption system. The number of the vibration damping units is ≥3.

6. A method for operating a pipeline dynamic vibration absorption system based on a magnetorheological elastomer and a particle damper according to any one of claims 1 to 5, characterized in that: The steps include: receiving pipeline vibration, tracking the frequency of the pipeline vibration, and adjusting the natural frequency of the pipeline dynamic vibration absorption system according to the frequency of the external vibration of the pipeline; It then resonates with the pipeline and transmits the amplitude to the pipeline dynamic vibration absorption system for vibration reduction.

7. The operating method of the pipeline dynamic vibration absorption system based on magnetorheological elastomer and particle damper according to claim 6, characterized in that: The magnetic component block adopts a hybrid working mode; When the pipeline vibrates horizontally in radial direction, the magnetorheological elastomer connected to the particle damper is in a shear mode, and the magnetorheological elastomer connected to the magnetically conductive pipe clamp is in a tension-compression mode; When the pipeline vibrates vertically and radially, the magnetorheological elastomer connected to the particle damper is in a tension-compression mode, and the magnetorheological elastomer connected to the magnetically conductive pipe clamp is in a shear mode; When the pipeline vibrates axially, the magnetorheological elastomer connected to the particle damper and the magnetorheological elastomer connected to the magnetically permeable pipe clamp are both in a shear mode.

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