Nonlinear tuned mass device for suppressing vibration of low-altitude pipeline

Abstract

The invention relates to the field of pipeline vibration control, in particular to a nonlinear tuned mass device for restraining low-altitude pipeline vibration. A nonlinear tuned mass device for restraining vibration of a low-altitude pipeline comprises the pipeline, and at least two elastic elements, a mass body and a damper are sequentially arranged below the pipeline. One end of each elastic element is connected to the pipeline, and the other end of each elastic element is centrally connected to one point on the mass body; one end of the damper is connected with the mass body, and the other end of the damper is fixed to an external object. The method has the advantages that a wider vibration frequency band can be covered through the adjusting mechanism, and the problem of multi-frequency vibration is effectively solved. Secondly, the mass body is matched with the damper, vibration energy in the pipeline system is dissipated through vertical vibration of the mass body, the vibration reduction effect, adaptability and economical efficiency of the system are remarkably improved, and the multi-frequency vibration suppression device is particularly suitable for multi-frequency vibration suppression in the low-altitude pipeline system; the device is simple in structure, convenient to install and capable of rapidly meeting the vibration reduction requirements under different working conditions.

Description

Technical Field

[0001] The invention relates to the field of pipeline vibration control, and in particular to a nonlinear tuned mass device for suppressing low-altitude pipeline vibration. Background Art

[0002] The pipeline vibration problem is particularly prominent in the low-altitude transportation system. Vibration not only causes structural fatigue and damage of the pipeline, but also may cause leakage, noise and other problems, threatening the transportation efficiency and safety. Most of the existing pipeline vibration control methods are rigid supports or passive damping devices. Although these methods can alleviate vibration to a certain extent, they cannot effectively regulate vibrations of different frequencies, especially under complex multi-frequency excitation conditions, and the control effect is poor. In addition, traditional vibration reduction equipment usually relies on a single stiffness or damping design, with limited adjustment capabilities and unable to adapt to changing working conditions, making it difficult to completely solve the vibration problem. In order to meet the above challenges, vibration reduction devices based on tuned mass are proposed in the prior art. However, most of these devices are linear structures, and can only be optimized for a single frequency when designing the tuning frequency. When the pipeline vibration frequency changes, the vibration reduction effect is significantly reduced. At the same time, the design and installation of traditional tuned mass devices are relatively complicated, requiring accurate calculation of vibration frequency and tuning parameters, which increases engineering costs and maintenance difficulties. Therefore, the existing pipeline vibration reduction technology has certain limitations in practical applications, and there is an urgent need for a nonlinear tuned mass device that is more flexible, can cope with multi-frequency vibration, has a simple structure, and is easy to maintain.

[0003] Based on the above situation, this patent proposes a nonlinear tuned mass device, which changes the vertical stiffness of the spring by adjusting the inclination angle of the tension spring, thereby being able to adapt to pipeline vibrations of different frequencies. The device uses the nonlinear characteristics of the spring and the inertia of the mass body to effectively cover a wider vibration frequency band, and dissipates vibration energy through the damper, which can suppress multi-frequency vibrations in low-altitude pipeline systems and significantly improve the vibration reduction effect. Summary of the invention

[0004] The present invention proposes a nonlinear tuned mass device for suppressing multi-frequency vibrations in a low-altitude pipeline system. The specific scheme is as follows: A nonlinear tuned mass device for suppressing vibration of a low-altitude pipeline comprises a pipeline, and at least two elastic elements, a mass body and a damper are sequentially arranged below the pipeline; one end of each elastic element is connected to the pipeline, and the other end is centrally connected to a point on the mass body; when the number of elastic elements is ≥2 and is an even number, the elastic elements are inclined at a certain angle and symmetrically arranged between the mass body and the pipeline; when the number of elastic elements is >2 and is an odd number, one elastic element is vertically arranged, and the remaining elastic elements are symmetrically arranged on two sides of the vertically arranged elastic element; one end of the damper is connected to the mass body, and the other end is fixed to an external object.

[0005] An adjustable elastic element is connected under the pipeline, and the vertical stiffness of the elastic element is changed by adjusting the inclination angle of the elastic element to achieve adaptability to vibrations of different frequencies.

[0006] The number of elastic elements is at least 2. When there are 2 elastic elements, they are arranged between the mass body and the pipeline at a certain angle, one end of the elastic element is connected to the pipeline, and the other end is connected to the mass body, and the two elastic elements are stretched at a certain angle and symmetrically arranged; when the number of elastic elements exceeds 2 and is an even number, the elastic elements are stretched at a certain angle and symmetrically arranged between the mass body and the pipeline; when it is an odd number, one elastic element is arranged vertically, that is, vertically between the pipeline and the mass body, one end is connected to the pipeline, and the other end is connected to the mass body, and the rest are symmetrically arranged on both sides of the vertical elastic element. The above-mentioned symmetry includes linear symmetry and angular symmetry, that is, the symmetrically arranged elastic elements can be located in the same straight line, or can be angularly symmetrically arranged between the mass body and the pipeline; wherein the angular symmetry means that when the number of elastic elements is an odd number, the elastic elements symmetrically arranged on both sides of the vertically arranged elastic element are angularly symmetrical relative to the vertically arranged elastic element, that is, they are not in the same straight line with the vertically arranged elastic element.

[0007] Preferably, it also includes a guide rail and a plurality of sliding bodies detachably connected to the guide rail, wherein the guide rail is arranged on one side of the pipeline and connected to the pipeline, on the same side as the elastic element, the mass body and the damper, wherein the track direction of the track is parallel to the axial direction of the pipeline.

[0008] A guide rail may also be connected under the pipeline and installed on the pipeline by welding or bolting, and a sliding body is arranged in the rail, and the elastic element is connected to the sliding body.

[0009] Preferably, the number of the sliding bodies is the same as the number of the elastic elements.

[0010] One sliding body corresponds to one elastic element, and through one-to-one connection between multiple sliding bodies and multiple elastic elements, the vertical stiffness of the elastic element changes with the adjustment of the position of the slider, so that the system can adapt to different vibration frequencies.

[0011] Preferably, one end of each elastic element is connected to each sliding body correspondingly, and the other end is centrally connected to a point on the mass body.

[0012] The tension and compression of the vertically arranged elastic element changes the natural frequency, plays a suspension role, and participates in the base of the overall stiffness.

[0013] Preferably, the elastic element is a stretchable spring.

[0014] Preferably, the sliding body is a sliding block.

[0015] Preferably, the slider is fixed to the guide rail by bolts or buckles, and the stretchable spring is connected to the slider by connecting bolts or buckles.

[0016] The slider is connected to one end of the stretchable spring. The slider is made of high-strength steel and is fixed to the specified position of the guide rail by bolts or buckles. The upper end point position of the stretch spring can be adjusted by changing the position of the slider; the upper end of the stretch spring is connected to the slider by bolts or buckles, and the lower end is connected to the mass body. The angle of the stretch spring can be adjusted by the position of the slider, thereby changing the vertical stiffness of the spring; the change in vertical stiffness enables the system to adjust its ability to suppress vibrations of different frequencies. The bolts are used for both the position of the slider and as an anchor point for the stretch spring to ensure the stability of the spring.

[0017] Preferably, the number of the tension springs is 3, 5 or 7.

[0018] Preferably, the mass body is one of a water tank, a concrete block or a steel plate; and the damper is a hydraulic damper or a pneumatic damper.

[0019] The mass body can be made of materials such as concrete, iron blocks or water bags, which have good durability and cost advantages; one end of the damper is connected to the mass body and the other end is fixed to the ground. The energy dissipation characteristics of the damper are used to effectively reduce the amplitude of pipeline vibration.

[0020] The advantages of the present invention are: through this adjustment mechanism, it can cover a wider vibration frequency band and effectively deal with the problem of multi-frequency vibration. Secondly, by utilizing the cooperation between the mass body and the damper, the vibration energy in the pipeline system is dissipated through the up and down vibration of the mass body, which significantly improves the vibration reduction effect, adaptability and economy of the system, and is particularly suitable for multi-frequency vibration suppression in low-altitude pipeline systems; the device has a simple structure and is easy to install, and can quickly adapt to the vibration reduction needs under different working conditions. At the same time, the system has low maintenance costs and the material selection is economical and practical.

[0021] Instruction Manual Figure 1 It is a diagram of the device of the present invention.

[0022] Description of the drawings: 1- pipe, 2- guide rail, 3- slider, 4- bolt, 5- tension spring, 6- mass body, 7- damper; DETAILED DESCRIPTION

[0023] Example 1 The following is a detailed description of the specific implementation of the present invention in combination with the technical scheme and the accompanying drawings, but the implementation of the present invention is not limited thereto: like Figure 1As shown, the present invention provides a nonlinear tuned mass device for suppressing vibration of low-altitude pipelines, which mainly includes a pipeline 1, a guide rail 2, three sliders 3, a bolt 4, three tension springs 5, a mass body 6 and a hydraulic damper 7.

[0024] The pipe 1 is made of high-strength steel and is used to support the entire vibration suppression system; the guide rail 2 is fixed to the pipe 1 by welding to ensure a stable connection and provide a stable sliding track; the slider 3 is made of high-strength steel and is first fixed to the specified position of the guide rail 2 by bolts 4 to adjust the upper end point position of the tension spring 5; the bolt 4 is used to fix the slider 3 and serves as an anchor point for the tension spring 5 to ensure the stability of the spring; Each tension spring 5 is connected to a corresponding slider 3, wherein one tension spring 3 is vertically arranged, and the other two tension springs 3 are symmetrically arranged on both sides of the vertical tension spring 3, and are located on the same straight line with the middle vertical tension spring 3; The upper end of each tension spring 5 is connected to the corresponding slider 3, and the lower end is connected to the mass body 6, and the angle can be adjusted by the position of the slider 3, so as to change the vertical stiffness of the tension spring 5; the mass body 6 is suspended from the tension spring 5 and the lower end of the guide rail 2, and the mass body 6 is made of an iron block, which can effectively absorb vibration; the upper end of the damper 7 is connected to the mass body 6, and the other end is fixed to the ground, so as to control the movement of the mass body 6 and dissipate the vibration energy, thereby suppressing the vibration of the pipeline; when the pipeline 1 vibrates, the extension and contraction of the tension spring 5 drives the mass body 6 to move up and down, and the inertia of the mass body 6 makes the damper 7 play a role to achieve effective control of the vibration; by adjusting the position of the slider 3, the suppression of vibrations of different frequencies can be achieved, and the adaptability of the system can be improved; the relevant parameters of the above components can be determined by optimization design to achieve the best vibration reduction effect and system stability.

[0025] The present invention provides a nonlinear tuned mass device for suppressing low-altitude pipeline vibration, which can flexibly adjust various parameters to meet the suppression requirements of vibrations of different frequencies. A reasonably designed vibration control device can not only effectively suppress the multi-frequency vibration of the pipeline, but also adapt to various complex working conditions, is easy to operate, safe and reliable, and has a wide range of applicability.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes, modifications or evolutions made by those skilled in the art based on the technical solution of the present invention to the above examples shall be regarded as part of the technical solution of the present invention.

Claims

1. A nonlinear tuned mass device for suppressing vibration of a low altitude pipeline, comprising a pipeline (1), characterized in that: At least two elastic elements, a mass body (6) and a damper (7) are sequentially arranged below the pipeline (1); One end of each elastic element is connected to the pipe, and the other end is centrally connected to a point on the mass body (6); When the number of elastic elements is ≥ 2 and is an even number, the elastic elements are arranged at a certain angle between the mass body and the pipe, and are inclined and symmetrically arranged between the mass body and the pipe; When the number of elastic elements is greater than 2 and is an odd number, one elastic element is arranged vertically, and the remaining elastic elements are symmetrically arranged on the sides of the vertically arranged elastic element 2; One end of the damper (7) is connected to the mass body (6), and the other end is fixed to an external object.

2. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 1, characterized in that: It also comprises a guide rail and a plurality of sliding bodies detachably connected to the guide rail, wherein the guide rail is arranged on one side of the pipeline and connected to the pipeline, and is on the same side as the elastic element, the mass body (6) and the damper (7), wherein the track direction of the track is parallel to the axial direction of the pipeline.

3. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 2, characterized in that: The number of the sliding bodies is the same as the number of the elastic elements.

4. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 3, characterized in that: One end of each elastic element is connected to each sliding body correspondingly, and the other end is centrally connected to a point on the mass body (6).

5. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to any one of claim 4, characterized in that: The elastic element is a tension spring (5).

6. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to any one of claims 2 to 5, characterized in that: The sliding body is a sliding block (3).

7. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 6, characterized in that: The slider (3) is fixed to the guide rail via bolts (4) or buckles, and the stretchable spring (5) is connected to the slider (3) via connecting bolts (4) or buckles.

8. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 7, characterized in that: The number of the tension springs (4) is 3, 5 or 7.

9. A nonlinear tuned mass device for suppressing low altitude pipeline vibration according to claim 1, characterized in that: The mass body (6) is one of a water tank, a concrete block or a steel plate; and the damper (7) is a hydraulic damper or a pneumatic damper.

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