阅读说明：本技术 一种用于索结构减振的多向多重调谐质量阻尼器 (Multi-directional multi-tuning mass damper for cable structure vibration reduction ) 是由 吴肖波 汪正兴 荆国强 王翔 马长飞 刘鹏飞 盛能军 李力 戴青年 肖龙 王梓宇 于 2020-12-18 设计创作，主要内容包括：本申请涉及一种用于索结构减振的多向多重调谐质量阻尼器,涉及振动控制技术领域,包括环形夹具和阻尼器组件,由于钢绞线自带阻尼和刚度,通过在钢绞线的两端分别固定质量块即可组成阻尼器组件,并将多个阻尼器组件环形分布于环形夹具上,再通过环形夹具卡接于拉索外,即可组成多向多重调谐质量阻尼器,其结构简单、体积小,不仅易于集成化处理,降低安装难度,还可减小阻尼器对拉索结构预设参数的影响；另外,由于阻尼器的调谐作用,因此当拉索发生多方向振动时,使得质量块与拉索一起振动,将拉索的振动能量最大限度的传递至质量块并通过钢绞线股线间的内摩擦耗散,使拉索的振动反应衰减并受到控制,进而有效减小拉索在不同方向上的振动。(The application relates to a multidirectional multi-tuned mass damper for damping vibration of a cable structure, which relates to the technical field of vibration control and comprises an annular clamp and damper components, wherein the damper components can be formed by respectively fixing mass blocks at two ends of a steel strand due to the self damping and rigidity of the steel strand, and are annularly distributed on the annular clamp; in addition, due to the tuning effect of the damper, when the inhaul cable vibrates in multiple directions, the mass block and the inhaul cable vibrate together, the vibration energy of the inhaul cable is transmitted to the mass block to the maximum extent and dissipated through internal friction among the steel strand stranded wires, the vibration reaction of the inhaul cable is attenuated and controlled, and then the vibration of the inhaul cable in different directions is effectively reduced.)

1. A multidirectional multiple tuned mass damper for cable structure vibration damping, comprising:

the cable pulling device comprises an annular clamp (1), wherein the annular clamp (1) comprises two semicircular rings which are connected in a buckling mode, and the annular clamp (1) is used for being clamped outside a pulling cable (3);

a plurality of damper assemblies (2), a plurality of damper assemblies (2) are annularly distributed on ring clamp (1), damper assemblies (2) include:

the steel strand (21), the steel strand (21) is vertically fixed on the annular clamp (1);

the two mass blocks (22) are respectively positioned on the upper side and the lower side of the annular clamp (1) and are respectively fixedly connected with the two ends of the steel strand (21).

2. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the mass (22) comprises a first portion (221) which is a cylinder.

3. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 2, wherein: the mass block (22) further comprises a second part (222), the second part (222) is arranged at one end, away from the annular clamp (1), of the first part (221), and the second part is a hemisphere.

4. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the tuned mass damper further comprises a sealed shell, a containing cavity is formed in the shell, the annular clamp (1) and the damper assembly (2) are arranged in the containing cavity, and damping liquid is filled in the containing cavity.

5. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: and damping rubber is arranged on the outer surface of the steel strand (21).

6. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the direction of the steel strand (21) is consistent with the direction of the inhaul cable (3).

7. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the weight of the mass block (22) positioned on the upper side of the ring-shaped clamp (1) is less than that of the mass block (22) positioned on the lower side of the ring-shaped clamp (1), and the length of the steel strand (21) positioned on the upper side of the ring-shaped clamp (1) is less than that of the steel strand positioned on the lower side of the ring-shaped clamp (1).

8. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the annular clamp (1) and the mass block (22) are respectively cast and molded with the steel strand (21).

9. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: the vibration frequencies of the plurality of damper assemblies (2) are not equal.

10. A multidirectional multiple tuned mass damper for cable structure vibration damping according to claim 1, wherein: two connecting ends of the semicircular rings are provided with fixing plates, and the two fixing plates on the same connecting end of the semicircular rings are connected through bolts.

Technical Field

The application relates to the technical field of vibration control, in particular to a multidirectional multiple-tuning mass damper for cable structure vibration reduction.

Background

The guy cable is a main stress member of the bridge structure and plays a role of transmitting the self weight of a main girder and the load of a vehicle to a bridge tower, a main cable, a main arch and the like.

Along with the continuous increase of the span of the bridge, the length of the stay cable is longer and longer, so that the characteristics of large flexibility, small mass and small damping of the stay cable are more obvious, and the stay cable becomes a component which is easy to vibrate. At present, the types of guy cable wind-induced vibration at home and abroad can be roughly divided into: the continuous vibration of the stay cable not only can cause fatigue and even damage of a cable strand in a short time, but also can cause discomfort for pedestrians and doubts of the use safety of the bridge for people, so that corresponding measures are required to be taken to control the vibration of the stay cable.

In the related art, vibration control of the cable is generally performed through a single tuned mass damper, which generally includes a damping system and a main mass M with a spring stiffness of a being a and a small mass M connected to a spring stiffness of K, but only performs unidirectional frequency vibration control, and the cable structure has the characteristics of abundant vibration modes and easy occurrence of multi-directional vibration, so that the single tuned mass damper cannot effectively control multi-directional vibration of the cable; in addition, because the structure of the tuned mass damper is relatively complex and large in size, if a plurality of single tuned mass dampers are integrated to realize multi-directional vibration control of the inhaul cable, the problem of high installation difficulty exists, the preset pneumatic parameters, mass distribution and the like of the inhaul cable structure can be influenced, and further the inhaul cable structure has potential safety hazards.

Disclosure of Invention

The embodiment of the application provides a multidirectional multi-tuned mass damper for cable structure vibration reduction, and aims to solve the problems that the damper in the related art cannot effectively control multidirectional vibration of a cable and is complex in structure, large in size and high in installation difficulty.

In a first aspect, there is provided a multidirectional multiple tuned mass damper for cable structure vibration damping, comprising: the annular clamp comprises two semicircular rings, the two semicircular rings are connected in a buckling mode, and the annular clamp is used for being clamped outside the inhaul cable;

a plurality of damper assemblies, a plurality of the damper assemblies annularly distribute on the ring clamp, the damper assemblies include:

the steel strand is vertically fixed on the annular clamp;

and the two mass blocks are respectively positioned on the upper side and the lower side of the annular clamp and are respectively fixedly connected with the two ends of the steel strand.

In some embodiments, the mass comprises a first portion that is a cylinder.

The mass block further comprises a second part, the second part is arranged at one end, far away from the annular clamp, of the first part, and the second part is a hemisphere.

The tuned mass damper further comprises a sealed shell, a containing cavity is formed in the shell, the annular clamp and the damper assembly are arranged in the containing cavity, and the containing cavity is filled with damping liquid.

And damping rubber is arranged on the outer surface of the steel strand.

The direction of the steel strand is consistent with the direction of the inhaul cable.

The weight of the mass block positioned on the upper side of the ring-shaped clamp is less than that of the mass block positioned on the lower side of the ring-shaped clamp, and the length of the steel strand positioned on the upper side part of the ring-shaped clamp is less than that of the steel strand positioned on the lower side part of the ring-shaped clamp.

The annular clamp and the mass block are respectively cast and molded with the steel strand.

The plurality of damper assemblies have different vibration frequencies.

Two connecting ends of the semicircular rings are provided with fixing plates, and the two fixing plates on the same connecting end of the semicircular rings are connected through bolts.

The beneficial effect that technical scheme that this application provided brought includes: not only can effectively control the multi-directional vibration of the inhaul cable, but also has simple structure, small volume and small installation difficulty.

The embodiment of the application provides a multidirectional multi-tuned mass damper for damping of a cable structure, and the steel strand is provided with damping and rigidity, so that a damper assembly can be formed by respectively fixing mass blocks at two ends of the steel strand, the plurality of damper assemblies are annularly distributed on an annular clamp, and then the annular clamp is clamped outside a cable, so that the multidirectional multi-tuned mass damper can be formed; in addition, due to the tuning effect of the damper, when the inhaul cable vibrates in multiple directions, the mass block and the inhaul cable vibrate together, the vibration energy of the inhaul cable can be transmitted to the mass block to the maximum extent and dissipated through internal friction among the steel strand stranded wires, the vibration reaction of the inhaul cable is attenuated and controlled, and then the vibration of the inhaul cable in different directions is effectively reduced. Therefore, the multi-directional vibration of the inhaul cable can be effectively controlled, and the inhaul cable is simple in structure, small in size and small in installation difficulty.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a multidirectional multiple-tuned mass damper for damping vibration of a cable structure according to an embodiment of the present application;

FIG. 2 is a schematic view of a damper assembly coupled to a ring clamp according to an embodiment of the present disclosure;

fig. 3 is a schematic connection diagram of a tuned mass damper and a cable according to an embodiment of the present application.

In the figure: 1-ring clamp, 2-damper assembly, 21-steel strand, 22-mass, 221-first part, 222-second part, 3-stay.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a multidirectional multi-tuning mass damper for cable structure vibration reduction, which can solve the problems that the damper in the related technology cannot effectively control multidirectional vibration of a cable and is complex in structure, large in size and high in installation difficulty.

Referring to fig. 1 to 3, a multidirectional multiple-tuning mass damper for damping vibration of a cable structure provided by an embodiment of the present application includes an annular clamp 1 and a plurality of damper assemblies 2, where the annular clamp 1 includes two semicircular rings, and the two semicircular rings are connected by a buckle, the annular clamp 1 is used to be clamped outside a cable 3, where an inner diameter of the semicircular ring is slightly larger than a diameter of the cable 3, an outer diameter of the semicircular ring is determined by the number of the damper assemblies 2 required by the cable 3 for damping vibration, the larger the number is, the larger the outer diameter is, but it is necessary to ensure that a mass block 22 does not collide during a vibration process; the damper assemblies 2 are annularly distributed on the annular clamp 1, each damper assembly 2 comprises a steel strand 21 and two mass blocks 22, each steel strand 21 vertically penetrates and is fixed on the annular clamp 1, the steel strands 21 can be preferably made of 19 strands of galvanized steel strands, damping and rigidity are provided, the direction of the steel strands 21 is consistent with that of the inhaul cable 3 (see fig. 3), and vibration of the inhaul cable 3 in all directions can be effectively controlled; the two mass blocks 22 are respectively positioned at the upper side and the lower side of the annular clamp 1 and are respectively fixedly connected with the two ends of the steel strand 21.

Because the steel strand 21 is provided with damping and rigidity, the damper assemblies 2 can be formed by respectively fixing the mass blocks 22 at the two ends of the steel strand 21, the plurality of damper assemblies 2 are annularly distributed on the annular clamp 1, and then the annular clamp 1 is clamped outside the inhaul cable 3, so that the multidirectional multi-tuned mass damper can be formed; in addition, due to the tuning effect of the damper, when the inhaul cable 3 vibrates in multiple directions, the mass block 22 and the inhaul cable 3 vibrate together, so that the vibration energy of the inhaul cable 3 can be transmitted to the mass block 22 to the maximum extent and dissipated through internal friction among strands of the steel strands 21, and the vibration reaction of the inhaul cable 3 is attenuated and controlled; meanwhile, the arrangement direction of the damper is consistent with the direction of the inhaul cable 3, so that the vibration of the inhaul cable 3 in different directions is effectively reduced. Therefore, the embodiment of the application can effectively control the multi-directional vibration of the inhaul cable 3, and has the advantages of simple structure, small volume and small installation difficulty.

In the related technology, the vibration of the stay cable is generally controlled by installing the external damper at the cable end, but the existing cable end damper can only realize the vibration control of the front several orders of modes (modes within the range of 0-3 Hz) of the stay cable 3, the damper has poor vibration attenuation effects on the high-order vibration of the stay cable 3 and the vibration attenuation effect of the damper at the vibration mode stagnation point, and the single tuned mass damper can only carry out vibration control of a single direction and a single frequency, so that the multi-mode vibration of the stay cable 3 cannot be effectively controlled.

Therefore, further, in the embodiment of the present application, the control frequency of a single damper assembly 2 can be set by adjusting the diameter and length of the steel strand 21 and the mass of the mass block 22, so that the control frequencies of n damper assemblies 2 are not equal, and n damper assemblies 2 with different control frequencies are collectively mounted on one ring clamp 1, so that the n-order vibration of the cable 3 can be controlled, and further the multi-mode vibration of the cable 3 can be controlled.

Furthermore, in the embodiment of the present application, referring to fig. 2, the mass 22 includes a first portion 221, which is preferably a cylinder, so that the mass of each mass 22 distributed on the ring fixture 1 is uniform, thereby ensuring that the mass 22 in the direction perpendicular to the plane of the steel strand 21 and 360 degrees can vibrate effectively.

Furthermore, in the embodiment of the present application, referring to fig. 2, the mass block 22 further includes a second portion 222, the second portion 222 is disposed at an end of the first portion 221 away from the ring clamp 1, wherein the second portion is a hemisphere, and the hemisphere is fixed on the cylinder, so that the cross section of the mass block 22 is streamline, wind flows around more easily, wind resistance is effectively reduced, vibration of the cable 3 is further effectively controlled, and the appearance is also provided.

Furthermore, in this application embodiment, the tuned mass damper further includes a sealed housing, and a containing cavity is formed in the housing, the ring clamp 1 and the damper assembly 2 are disposed in the containing cavity, and the containing cavity is filled with damping fluid, when the damping provided by the steel strand 21 is small, the ring clamp 1 and the damper assembly 2 can be wholly immersed in the damping fluid by the ring clamp, so as to increase the damping of the multi-directional multi-tuned mass damper, and further control the vibration of the cable 3 better. Preferably, the damping of the multidirectional multi-tuned mass damper can also be increased by laying damping rubber on the outer surface of the steel strand 21.

Furthermore, in the embodiment of the present application, the weight of the mass block 22 located on the upper side of the ring clamp 1 is less than the weight of the mass block 22 located on the lower side of the ring clamp 1, and the length of the part of the steel strand 21 located on the upper side of the ring clamp 1 is less than the length of the part located on the lower side of the ring clamp 1, so that not only can the rigidity of the steel strand 21 be ensured, but also the initial deformation of the steel strand due to the influence of gravity can be reduced.

Furthermore, in the embodiment of the present application, the ring clamp 1 and the mass block 22 are respectively cast and molded with the steel strand 21, which can eliminate the gap at the joint of the ring clamp 1, the mass block 22 and the steel strand 21, thereby improving the durability, and in addition, the ring clamp 1 and the mass block 22 can be made of zinc-aluminum alloy with better durability, thereby further improving the durability of the multi-directional multi-tuned mass damper.

Furthermore, in the embodiment of the application, one connecting end of the two semi-circular rings is connected in a buckling manner, and the other connecting end is pivoted, so that the connection mode between the annular clamp 1 and the inhaul cable 3 is simpler and easier, and the operation is convenient and efficient; preferably, the two links of semicircle ring all are equipped with the fixed plate, and are equipped with the bolt hole on the fixed plate, and two bolt holes on the same link of two semicircle rings are connected through the bolt, and two semicircle rings are promptly with cable 3 ring armful back, directly use the nut to fix after passing the bolt two bolt holes on the same link of two semicircle rings in proper order, can lock cable 3, and easy operation is swift again, can effectively improve the efficiency of construction of the multiple harmonious mass damper of multidirectional.

Specifically, the working principle of the multidirectional multiple-tuning mass damper for cable structure vibration damping provided by the embodiment of the application is as follows:

(1) determining an n-order mode to be controlled by the vibration of the inhaul cable 3 through inhaul cable theoretical calculation, model test or vibration actual measurement and the like;

(2) determining the vibration frequency of the n-order mode required to be controlled by the inhaul cable 3, wherein the calculation formula is as follows:

in the formula (f)_nThe vibration frequency is n orders of the stay cable 3, n is the vibration order of the stay cable 3 (the vibration order of the stay cable 3 can be obtained by field actual measurement or theoretical calculation), l is the length of the stay cable 3, T is the tension of the stay cable 3, and m is the linear density of the stay cable 3;

(3) the control frequency of the single damper assembly 2 is determined by the formula:

in the formula (f)_n' is the control frequency of the nth damper component 2, E is the modulus of elasticity of the steel strand 21, I_nIs the bending stiffness of the steel strand 21, m_nIs the weight of the mass 22, /)_nIs the length of the steel strand 21; during the control process, make f_n＝f_n', the effect of multiple tuning control of the vibration of the inhaul cable 3 can be achieved;

(4) tuning the parameters of a mass damper, wherein the mass m of the mass 22 is designed according to the control frequency of a single damper assembly 2_nSelecting 1-2% of the modal mass of the sling, selecting the type (such as 19-phi 5) of the steel strand 21, and determining the bending rigidity I of the steel strand 21_n(the specification of the steel strand can be inquired), and the length l of the steel strand 21 is calculated reversely_n；

(5) Assemble a plurality of attenuator subassemblies 2 to the annular distribution forms the multiple harmonious mass damper of multidirectional that is used for cable structure damping on ring clamp 1, and the accessible bolt is installed the multiple harmonious mass damper of multidirectional on cable 3 at last.

The multidirectional multi-tuning mass damper for damping the stay cable structure, which is provided by the embodiment of the application, has the advantages of simple structure and convenience in installation and maintenance, can serve the whole bridge life cycle such as a construction period, an operation period and the like, and does not influence the cable force adjustment in the construction period; and through changing the structural material, the durability of the damper is effectively improved.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.