A single-tube tuned mass damper

Abstract

The present invention provides a single-tube tuned mass damper, comprising multiple groups of vibration-damping structures uniformly laid out at intervals on the outer surface of a pipe, wherein each group of vibration-damping structures comprises a plurality of springs, a mass block, and a cavity with a hollow interior, arranged in sequence in a direction gradually away from the pipe; the interior of the cavity is sequentially filled with damper oil, a floating piston, and nitrogen gas in a direction approaching the pipe, a piston rod is provided on the side of the cavity containing the damper oil; and the cavity penetrates into the interior of the mass block. The present invention achieves a good vibration-damping effect by adopting a single-tube design, arranging damper oil and nitrogen gas in the cavity, isolating the oil-gas mixture with a floating piston, and performing a pushing motion of the piston rod within the upper cavity. Compared with the original tuned mass damper, the present invention more fully absorbs the vibration energy of the pipe structure, achieving a better energy absorption and vibration reduction effect.

Description

Technical Field

[0001] The present invention belongs to the field of structural vibration reduction control, and in particular relates to a monocular tuned mass damper. Background Art

[0002] With the rapid development of my country's economy and the dramatic changes in the international situation, the demand for vibration reduction in pipelines on both civil and military vessels is also increasing. Pipeline structure vibrations can significantly affect the ride experience and harm the health of crew members on board. Furthermore, they pose significant challenges to the concealment requirements of certain vessels. Therefore, suppressing pipeline structure vibrations is crucial.

[0003] Vibration control plays a vital role in modern engineering, particularly in structures such as buildings, bridges, and mechanical equipment, where controlling vibration can significantly improve safety, comfort, and service life. Traditional tuned mass dampers (TMDs) achieve vibration reduction by adjusting the parameters of the mass, spring, and damper. However, in practical applications, the vibration frequency and amplitude typically vary, limiting the effectiveness of traditional TMDs.

[0004] Currently, the most commonly used method for controlling vibration in pipeline structures is to use tuned mass dampers for passive control. When the natural frequency of the tuned mass damper is adjusted to be close to the main natural frequency of the controlled structure, the structural resonance characteristics are changed, and a resonance mechanism is formed between the two. The damper absorbs and consumes the vibration energy of the structure. When the structure vibrates, the mass block can produce a corresponding reverse motion, generating a reverse inertial force acting on the structure, thereby reducing the vibration amplitude of the structure and improving the structural safety and service life. Currently, the tuned mass dampers used on pipeline structures are mostly traditional hoisted or ground-fixed devices. This setting makes the traditional tuned mass damper device have a single and incomplete control direction.

[0005] Therefore, in order to solve the problem of single and incomplete control direction of traditional suspended tuned mass damper devices, it is urgent to develop a new type of single-tube tuned mass damper that can control the vibration of the pipeline structure in multiple directions.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The first purpose of the present invention is to provide a single-tube tuned mass damper, which can effectively solve the vibration control problem of the pipeline structure under the condition of fluid-solid coupling, thereby reducing the vibration of the pipeline, protecting the pipeline structure from damage and greatly improving the service life. The problem of the single control direction of the traditional tuned mass damper is solved by arranging multiple groups of vibration-damping structures outside the pipeline and the synergistic effect of the vibration-damping structures.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] The present invention provides a single-tube tuned mass damper, comprising a plurality of groups of vibration-damping structures uniformly laid at intervals on the outer surface of a pipe, wherein each group of vibration-damping structures comprises a plurality of springs, a mass block, and a cavity with a hollow structure arranged in sequence in a direction gradually away from the pipe; the interior of the cavity is filled with vibration damper oil, a floating piston, and nitrogen in sequence in a direction approaching the pipe, a piston rod is penetrated on the side of the cavity filled with the vibration damper oil; and the cavity penetrates into the interior of the mass block.

[0010] In the single-tube tuned mass damper of the present invention, the purpose of absorbing and consuming energy is achieved by setting a cavity, wherein a floating piston, shock absorber oil and nitrogen are arranged in the cavity, and the floating piston is used to prevent the shock absorber oil and nitrogen inside the cavity from mixing, so that the shock absorber oil and nitrogen in the cavity are separated, and a piston rod is passed through the side of the cavity filled with shock absorber oil. When the pipeline structure vibrates, the piston rod will produce a pushing movement with the vibration of the pipeline structure, and the shock absorber oil and nitrogen in the cavity will provide damping force under the push of the floating piston to dissipate the vibration energy, thereby consuming the energy generated after the pipeline structure vibrates.

[0011] Preferably, as a further specific implementation, the extension line of the central axis of the cavity needs to pass through the center of the pipe and be perpendicular to the surface of the mass block.

[0012] In the present invention, there are certain limitations on the setting position of the cavity. This is because in the tuned mass damper of the present invention, in order to further achieve the purpose of vibration reduction, the present invention consumes the energy generated by the vibration of the pipeline structure by setting a cavity, and the mass block will produce a movement in the opposite direction of the structural vibration. The reverse movement generates a reverse force, which acts on the pipeline structure to reduce the amplitude of the structural vibration. Then, while generating a reaction force, the mass block will transfer the energy generated by the vibration of the pipeline structure to the cavity, so that the piston rod in the cavity will push and pull with the vibration of the pipeline structure. The lower end of the piston rod in the cavity will ensure that part of the shock absorber oil that has not entered the upper part of the cavity can push the floating piston downward to compress the nitrogen. The shock absorber oil and nitrogen in the cavity are transmitted and contacted by the piston rod to generate a damping force, which acts on the pipeline structure and absorbs and dissipates the energy generated by the relative movement between the mass block and the pipeline structure, thereby reducing the vibration amplitude of the structure. Therefore, from the above, it can be seen that the setting position between the mass block and the cavity is very important. When the extension line of the central axis of the cavity passes through the center of the pipe structure and is perpendicular to the surface of the mass block, the vibration reduction effect that can be achieved is the best. In this way, it can be well ensured that the tuned mass damper can achieve a good vibration reduction effect even in extreme cases. If the cavity is skewed so that the cavity and the mass block are not perpendicular, the tuned mass damper itself will face the damage of the shear force and torsional force, thereby greatly reducing the vibration reduction effect of the tuned mass damper.

[0013] Preferably, as a further specific implementation, the volume ratio of the shock absorber oil to the nitrogen in the cavity is 2:1-3:1.

[0014] Preferably, as a further specific implementation, the volume ratio of the shock absorber oil and nitrogen in the cavity is 3:1.

[0015] In the present invention, the volume ratio of the shock absorber oil and nitrogen set in the cavity is very important for the present invention. This is because when the pipeline structure vibrates, a reverse force is generated through the mass block to achieve the purpose of vibration reduction. In order to further achieve a better vibration reduction effect, the present invention consumes the energy generated by the vibration of the pipeline structure by setting a cavity above the mass block, which is mainly achieved by filling the cavity with shock absorber oil, a floating piston and nitrogen, and passing a piston rod through the side of the cavity where the shock absorber oil is filled. The piston rod pushes and pulls in the shock absorber oil, thereby pushing the floating piston downward to compress the nitrogen. The shock absorber oil and nitrogen in the cavity are transmitted and contacted by the piston rod to generate a damping force, which acts on the pipeline structure and absorbs and dissipates the energy generated by the relative movement between the mass block and the pipeline structure, thereby reducing the vibration amplitude of the structure. Therefore, it can be known that when the volume ratio of the shock absorber oil and nitrogen in the cavity of the present invention is 2:1-3:1, preferably when the volume ratio of the shock absorber oil and nitrogen in the cavity is 3:1, the vibration reduction effect that can be achieved is the best. If the shock absorber oil is less and the nitrogen is more, it will bring inconvenience to the tuning of the tuned mass damper in the actual function and make the vibration reduction effect poor. If the amount of nitrogen used is too much and the shock absorber oil is not much, it means that the gas will be excessive and overflow into the shock absorber oil, generating a large number of bubbles, which affects the vibration reduction effect of the damper.

[0016] Preferably, as a further specific embodiment, a hoop is provided above the piston rod, a first pad is provided between the hoop and the piston rod, a second pad is provided between the spring and the outer surface of the pipe, and the first pad and the second pad are arranged opposite to each other.

[0017] In the present invention, the vibration damping structure is fixed to the outer surface of the pipeline by arranging pads between the hoop and the piston rod and between the spring and the outer surface of the pipeline, and the damper device is installed between the first pad on the inner surface of the hoop and the second pad on the outer surface of the pipeline structure. The pad can effectively transfer the vibration of the pipeline structure to the vibration damping structure, thereby effectively solving the fluid-solid coupling vibration control problem of the pipeline structure and reducing the vibration of the pipeline structure during operation.

[0018] In the present invention, a single-tube tuned mass damper is arranged on the outer surface of the pipe structure by arranging a hoop. The arrangement of the hoop allows the vibration-damping structure to be fixed between the pipe structure and the hoop. The hoop of the present invention is composed of two semicircular ring structures fixedly connected by bolts to form a hoop as a whole. By arranging the vibration-damping structure inside the hoop and combining it with the special design of the cavity in the vibration-damping structure, the problem of the traditional tuned mass damper having a single control direction can be solved well, and the vibration-damping effect can be greatly improved. There are three vibration-damping structures arranged between the hoop and the pipe, and each is 120° apart. When they are evenly distributed in a circular shape inside the hoop, the vibration-damping effect that can be achieved is excellent. This is because by designing three vibration-damping structures inside the hoop, and each vibration-damping structure is 120° apart, a triangular support shape is formed between the three vibration-damping structures. This method has a better vibration-damping effect on the overall vibration of the pipe structure.

[0019] Preferably, as a further specific embodiment, the piston rod is inserted into the first backing plate and fixed therein, so as to fixedly connect the cavity and the first backing plate.

[0020] Preferably, as a further specific implementation, the center of the mass block coincides with the centers of the first pad and the second pad.

[0021] In the design of the vibration-damping structure of the present invention, the present invention has certain limitations on the positional relationship between the mass block and the first and second pads. This is because when the pipeline vibrates, the second pad will transmit the vibration of the pipeline to the spring. As the pipeline vibrates, the spring will transmit the vibration to the mass block. The mass block will produce reverse motion due to the connection of the spring. This reverse force then acts on the pipeline structure, thereby achieving resonance between the mass block and the pipeline structure. Because the second pad can better transmit the vibration of the pipeline to the mass block, it is necessary to coincide the center of the mass with the center of the first pad, so as to better achieve resonance between the mass block and the pipeline structure, thereby achieving the purpose of dissipating energy and controlling vibration. If the position is deviated to a certain extent, it will affect the vibration reduction effect of the damper to a certain extent.

[0022] Preferably, as a further specific implementation manner, the number of the springs is three, and the springs are evenly distributed at intervals between the mass block and the second pad.

[0023] When the number of springs is set to three, the present invention can achieve an excellent vibration reduction effect. This is because when the three springs are evenly arranged between the second pad and the mass, when the pipeline structure vibrates, the pipeline structure will transfer the vibration to the springs through the second pad. At this time, when the number of springs is three, they are evenly arranged between the mass block and the second pad, which can achieve the optimal effect of the springs transferring the vibration to the mass block.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention provides a single-tube tuned mass damper, which adopts a hoop external fixation design. The vibration reduction device can be installed in any direction between the pipeline structure and the hoop. The installation position and direction of the vibration reduction device are determined according to the actual vibration mode of the structure. This is something that cannot be achieved with traditional hoisting and ground-fixed tuned mass damper devices.

[0026] (2) The present invention provides a single-tube tuned mass damper. The present invention adopts a single-tube design, arranges shock absorber oil and nitrogen in the cavity, isolates the oil-gas mixture with a floating piston, and the piston rod performs a pushing movement in the upper cavity, thereby achieving a good vibration reduction effect. On the basis of the original tuned mass damper, the present invention more fully absorbs the vibration energy of the pipeline structure and achieves a better energy absorption and vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A structural diagram of a single-tube tuned mass damper provided by the present invention;

[0028] Figure 2 The figure is a schematic structural diagram of a cavity in a single-tube tuned mass damper of the present invention.

[0029] Among them, 1. hoop; 2. piston rod; 3. cavity; 4. nitrogen; 5. shock absorber oil; 6. floating piston; 7. mass block; 8. spring; 9. steel rod; 10. first pad; 11. pipe; 12. second pad. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples. It should be noted that the following examples are intended only to explain the principles and applications of the present invention and are not intended to limit the scope thereof. In the examples, unless a specific situation is specified, the examples are operated according to general conditions or manufacturer recommendations. The reagents and instruments used, if not indicated by the manufacturer, are commercially available.

[0031] In the specification, the terms "connected," "connected," and "fixed," unless otherwise specified or limited, should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; they can be mechanical or electrical; they can be direct or indirect through an intermediary; they can be a connection between two elements or an interactive relationship between two elements. Those skilled in the art will understand that the specific meanings of the above terms will apply in specific circumstances.

[0032] Unless otherwise specified or limited, when a first characteristic is "above" or "below" a second characteristic, it may include that the first characteristic is in direct contact with the second characteristic, or that the first characteristic and the second characteristic are not in direct contact but are in contact with each other via another characteristic between the second characteristic. Similarly, when a first element is "above," "above," or "above" a second element, it may include that the first element is directly above the second element, or simply indicate that the first element is at a higher level than the second element. When a first characteristic is "below," "below," or "below" a second characteristic, it may include that the first characteristic is directly below and diagonally downward from the second characteristic, or simply indicate that the first characteristic is at a lower level than the second characteristic.

[0033] In the description of this embodiment, terms such as "upper," "lower," and "right" regarding orientations or positions are based on the orientations or positions shown in the accompanying drawings. These terms are intended solely for ease of description and operation and are not intended to indicate or imply that the devices or components described must be configured and operated in a specific orientation. Therefore, they should not be considered as limitations of the present invention. Furthermore, the terms "first" and "second" are merely adjectives and do not have any special meaning.

[0034] Example 1

[0035] See the instructions attached Figure 1-2 In a single-tube tuned mass damper of the present invention, three groups of vibration-damping structures are evenly laid on the outer surface of a pipe at intervals of oil, wherein each group of vibration-damping structures includes a plurality of springs 8, a mass block 7, and a cavity 3 with a hollow structure arranged in sequence in a direction gradually away from the outer surface of the pipe, wherein the interior of the cavity 3 is filled with damper oil 5, a floating piston 6, and nitrogen 4 in sequence in a direction approaching the pipe, and a piston rod 2 is passed through the side of the cavity 3 containing the damper oil 5, wherein the lower end of the cavity 3 penetrates into the interior of the mass block 7;

[0036] The extended line of the central axis of the cavity 3 needs to pass through the center of the pipe 11 and be perpendicular to the surface of the mass block 7;

[0037] In the cavity, the volume ratio of the shock absorber oil 5 and the nitrogen 4 in the cavity 3 is limited to a certain extent, wherein the volume ratio of the shock absorber oil 5 and the nitrogen 4 in the cavity 3 is 2:1-3:1, and preferably when the volume ratio of the shock absorber oil 5 to the nitrogen 4 is 3:1, the vibration reduction effect that can be achieved is the best. This is because if the shock absorber oil is less and the nitrogen is more, it will bring inconvenience to the tuning of the tuned mass damper in the actual function and make the vibration reduction effect poor. If the amount of nitrogen used is too much and the shock absorber oil is not much, it means that the gas will be excessive and overflow into the shock absorber oil, generating a large number of bubbles, which affects the vibration reduction effect of the damper.

[0038] A hoop 1 is provided above the piston rod 2, a first pad 10 is provided between the hoop and the piston rod, a second pad 12 is provided between the spring 8 and the outer surface of the pipe 11, and the first pad 10 and the second pad 12 are vertically opposed to each other to form a group.

[0039] The top of the piston rod 2 penetrates into the interior of the first pad 10, thereby achieving a fixed connection between the cavity 3 and the first pad 10;

[0040] The center of the mass block 7 needs to coincide with the centers of the first pad 10 and the second pad 12. In this way, the second pad 12 can better transmit the vibration of the pipeline to the mass block 7. Therefore, the center of the mass block 7 needs to coincide with the center of the first pad 10, so as to better achieve the resonance of the mass block 10 and the pipeline 11, thereby achieving the purpose of dissipating energy and controlling vibration. If the position is deviated to a certain extent, the vibration reduction effect of the damper will be affected to a certain extent.

[0041] There are three springs 8 arranged between the mass block 7 and the second pad 12, and the three springs 8 are evenly arranged at intervals between the mass block 7 and the second pad 12, so that the springs 8 can evenly transmit the vibration generated by the pipe 11 to the mass block 7.

[0042] There are multiple threaded holes below the mass block 7, and a steel rod 9 is passed through the center of the spring 8. The upper end of the steel rod 9 is inserted into the threaded hole and screwed, so that the spring 8 and the mass block 7 are fixedly connected.

[0043] The working process of the mono-tube tuned mass damper provided by the present invention is as follows:

[0044] When in use, the shock absorbing structure is arranged between the hoop 1 and the outer surface of the pipe 11 through the hoop, wherein the arrangement is as follows Figure 1As shown, after the position of the vibration damping structure is determined, the two semicircular hoop interfaces are connected and fixed with bolts, wherein the piston rod 2 and the spring 8 at the top of the cavity 3 can control the position of the mass block 7 to achieve resonance with the natural frequency, and then the up and down push-pull movement of the piston rod 6 in the cavity 3 enables the shock absorber oil 5 to effectively push the floating piston 6 to compress the nitrogen 4 below, thereby generating a damping force, and then react on the pipe 11 through the contact of the mass block 7, realizing the resonance of the mass block 7 and the pipe 11. The inertial force generated by the reverse movement of the mass block 7 reacts on the pipe 11 through the spring 8, thereby suppressing the vibration of the pipe 11 and consuming the energy generated when the pipe 11 vibrates.

[0045] 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 monocular tuned mass damper, characterized in that: The invention comprises a plurality of groups of vibration-damping structures uniformly laid at intervals on the outer surface of the pipeline, wherein each group of vibration-damping structures comprises a plurality of springs, a mass block, and a cavity with a hollow structure arranged in sequence in a direction gradually away from the pipeline; the interior of the cavity is filled with vibration damper oil, a floating piston, and nitrogen in sequence in a direction approaching the pipeline; a piston rod is passed through the side of the cavity filled with vibration damper oil; and the cavity penetrates the interior of the mass block; The extended line of the central axis of the cavity must pass through the center of the pipe and be perpendicular to the surface of the mass block; A hoop is provided above the piston rod, a first pad is provided between the hoop and the piston rod, a second pad is provided between the spring and the outer surface of the pipe, and the first pad and the second pad are provided opposite to each other; The center of the mass block coincides with the centers of the first pad and the second pad.

2. The monocular tuned mass damper according to claim 1, characterized in that: The volume ratio of the shock absorber oil to the nitrogen in the cavity is 2:1-3:

1.

3. The monocular tuned mass damper according to claim 2, characterized in that: The volume ratio of the shock absorber oil to the nitrogen in the cavity is 3:

1.

4. The monocular tuned mass damper according to claim 1, characterized in that The piston rod is inserted into the first backing plate and fixed therein, so as to fixedly connect the cavity and the first backing plate.

5. The monocular tuned mass damper according to claim 1, characterized in that: The number of the springs is three, and the springs are evenly distributed at intervals between the mass block and the second pad.

6. The monocular tuned mass damper according to claim 4, characterized in that A plurality of threaded holes are provided below the mass block, and a steel rod is passed through the center of the spring; the upper end of the steel rod is passed through the threaded hole and screwed, so that the spring and the mass block are fixedly connected.

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