Multi-wing suspension damper with composite vibration reduction function

Abstract

The invention discloses a multi-wing cantilever damper with a composite vibration reduction function, comprising: an anti-fatigue metal block, an alloy main beam, an aluminum alloy plate, a cantilever perforated fiber-reinforced damping composite beam, a particle mass tuning ball and a particle steel ball. The damper is attached to the outer surface of the middle and high parts of the building body, and does not affect the design and use of the building itself. When under the action of wind load or earthquake, the alloy main beam and the cantilever support beam will play a role in tuning and vibration reduction. The two will vibrate together with the building body, so that the inertial force generated by the relative movement of the multi-wing cantilever damper reacts to the main structure, thereby reducing the dynamic response of the main structure and improving the vibration resistance and safety of the overall structure. Under the action of external excitation, the particle mass tuning ball welded to the cantilever support beam plays a role in friction energy consumption and collision energy consumption through relative sliding and mutual collision between the internal particle steel balls and between the particle steel balls and the cavity, thereby achieving a better vibration reduction effect.

Description

Technical Field

[0001] The invention patent belongs to the field of anti-vibration and vibration reduction of civil engineering structures and disaster prevention and reduction, and specifically relates to a multi-wing cantilever damper with composite vibration reduction function. Background Art

[0002] With the rapid development of the national economy and infrastructure, the construction of high-rise and tall structures in my country is accelerating. Preventing high-rise and tall structures from destructive collapse under the action of wind or earthquake has become a major issue that must be addressed in engineering construction. If only the stiffness of the engineering structure itself is used to resist earthquakes, such as increasing the strength grade of the material or increasing the cross-sectional size of the component, it is not only uneconomical but also has major problems. The emergence of structural energy dissipation and vibration reduction technology and related vibration control methods is expected to effectively solve this problem.

[0003] The basic principle of energy dissipation vibration reduction technology is to install additional energy dissipation substructures or energy dissipation devices on the main structure to redistribute the vibration energy between the original structure and the substructure, so as to make the energy dissipation device fully dissipate energy, thereby reducing the dynamic response of the main structure and achieving the purpose of vibration reduction. Among the energy dissipation vibration reduction technologies, the tuning vibration reduction technology has the characteristics of clear mechanism and simple implementation. Its basic principle is to make the main structure vibrate under the action of external excitation, drive the auxiliary structure (tuning device) with the same or similar vibration period to vibrate together, and the inertial force generated by the relative motion of the tuning device reacts to the structure, performs tuning control, and suppresses the vibration of the structure, thereby reducing the dynamic response of the main structure. The tuned mass damper is one of the earliest structural passive control devices used in structural vibration control. When the natural frequency of the tuned mass damper is consistent with or close to the first-order natural frequency of the main structure, the vibration control effect is best. However, the traditional tuned mass damper has the disadvantages of being sensitive to the natural frequency of the main structure, requiring support and occupying a large space, and having a high actual engineering cost. It is not suitable for direct installation on the surface or top of the structure.

[0004] In view of the shortcomings of traditional tuned mass dampers, a new type of damper can be proposed based on the mechanism of tuned vibration reduction. For example, the mechanical mechanism of a cantilever beam structure or a cantilever beam structure with a mass block at the end is relatively simple and clear, and its natural vibration period or frequency can also be accurately calculated, so it has clear dynamic characteristics and vibration energy dissipation capacity, and a similar type of device can be used to achieve tuned vibration energy reduction. In addition, particle damping technology is also a new type of passive vibration control damping technology. It converts mechanical energy into heat energy and dissipates it by utilizing friction and collision between particles and between particles and the inner wall of the cavity, thereby reducing the vibration displacement amplitude of the machine itself, reducing the amplitude, playing a damping role, and achieving the purpose of vibration reduction and noise reduction. Adding damping particles to the new tuned vibration reduction device can further improve the overall energy dissipation capacity.

[0005] In view of this, the multi-wing cantilever damper with a composite vibration reduction function involved in the present invention cleverly combines the above two energy-consuming vibration reduction methods. By connecting multiple cantilever support beams on both sides of the cantilever beam and welding particle mass tuning balls at the ends of the support beams, when the main structure vibrates under external excitation, it drives the cantilever structure with a similar vibration frequency to vibrate together. At the same time, the particle steel balls inside the particle mass tuning balls rub and collide to achieve a composite tuning vibration reduction function.

[0006] From the above discussion, it can be seen that the multi-wing cantilever damper with composite vibration reduction function designed by the present invention is not only simple in structure and clear in mechanism, but also has a wide range of applications and strong applicability. It can be installed on the outside of various high-rise buildings, suspension bridges, transmission towers and other engineering structures. Moreover, since it can be attached to the height of the building, it will not occupy the normally used space. At the same time, the energy consumption efficiency of the invention is high and it is easy to adjust. By adjusting the diameter and number of the internal granular steel balls, the geometric characteristics of the alloy main beam and the cantilever support beam, and the installation direction of the damper, the natural frequency of each vibration direction can be adjusted separately, and energy consumption tuning can be performed within a wider frequency band to reduce the vibration of the high-rise building structure. It has broad market application prospects. Summary of the invention

[0007] In order to meet the needs of multiple vibration reduction and energy dissipation for various engineering structures, the present invention proposes a multi-wing cantilever damper with a composite vibration reduction function. Under the action of wind or earthquake, it can not only achieve vibration reduction and energy dissipation under the action of earthquake or wind load in any direction, but also can adjust the diameter and number of internal granular steel balls and the size of alloy main beams and cantilever support beams for different high-rise structures, so that the installed multi-wing cantilever damper can achieve the optimal or better energy dissipation and vibration reduction effect, thereby ensuring the safety of the high-rise structure. This multi-wing cantilever damper has the characteristics of convenient adjustment, flexible layout and high energy dissipation efficiency.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A multi-wing cantilever damper with a composite vibration reduction function, the device mainly comprises: an anti-fatigue metal block 1, an alloy main beam 2, an aluminum alloy plate 3, a cantilever perforated fiber reinforced damping composite material beam 4, a particle mass tuning ball 5 and a particle steel ball 7. One end of the first alloy main beam 2 is welded to the anti-fatigue metal block 1, and the other end is connected to another alloy main beam 2 through the aluminum alloy plate 3. The cantilever support beam is formed by connecting the cantilever perforated fiber reinforced damping composite material beam 4 and the anti-fatigue metal block 1, connecting the alloy main beam 2 and the cantilever support beam in a multi-wing shape, and connecting the particle mass tuning ball 5 to the cantilever support beam. The alloy main beam 2 and the cantilever perforated fiber reinforced damping composite material beam 4 are connected to the anti-fatigue metal block 1, which greatly improves the anti-fatigue ability of the multi-wing cantilever damper when the steel frame itself is connected and the connection with the main structure swings. At the same time, the multi-wing shape design can greatly enhance the energy consumption of the building body when it swings and when the granular steel balls 7 collide and rub in the cavity, further reduce the vibration of the building, and achieve composite vibration reduction.

[0010] The length ratio of each section of the alloy main beam 2 to the cantilever support beam is 1:0.5~1:2. The thickness of the cantilever support beam is slightly smaller than the thickness of the alloy main beam 2 by 2cm~3cm. The length of the alloy main beam 2 is not less than 400mm. The alloy main beam 2 is made of high-strength, high-toughness, and excellent corrosion-resistant alloy steel or stainless steel, etc. The elastic modulus of the alloy steel should be 100GPa~250GPa. The fatigue-resistant metal block 1 should be made of metals with excellent fatigue resistance, good wear resistance and corrosion resistance, such as titanium alloy, high-speed steel, alloy steel, etc. The elastic modulus of the fatigue-resistant metal block 1 should be 100GPa~200GPa.

[0011] The diameter of the particle mass tuning ball 5 should be 3 to 5 times the width of the cantilever support beam. The selected particle mass tuning ball 5 and the internal particle steel ball 7 are made of the same material as the alloy main beam 2. The diameter of the particle steel ball 7 is 1 / 50 to 1 / 5 of the diameter of the spherical shell of the particle mass tuning ball 5. Multiple large-diameter particle steel balls 7 and several particle steel balls 7 with different small diameters are placed in the spherical shell. The filling rate of the particle mass tuning ball 5 is required to be between 30% and 50%. At this time, the collision friction energy consumption effect is optimal.

[0012] The cantilever perforated fiber reinforced damping composite beam 4 in the cantilever beam is a new type of component with upper and lower layers of resin skins and a middle layer of perforated fiber and reinforced damping film. The damping film composite beam is made according to the curing process curve of carbon fiber prepreg. The elastic modulus of the resin material is 3.0GPa~3.4GPa; the elastic modulus of the fiber material is 250GPa~300GPa, and the shear modulus is 15GPa~20GPa; the elastic modulus of the carbon fiber is 30GPa~70GPa, and the shear modulus is 5GPa~10GPa; the elastic modulus of the viscoelastic material is 15GPa~20GPa. The thickness of the upper and lower skin layers is equal, and the damping layer is 1 / 2~1 / 15 of the total thickness of the skin layer, which can ensure that the structure has high damping performance while ensuring that the component has sufficient stiffness. For perforated damping structures, the perforation diameter should be 1.4mm~1.6mm, the perforation spacing should be 10mm~16mm, and the damping layer area ratio should be 80%~95%.

[0013] The multiple alloy main beams 2 are connected and fixed by bolts 6 and aluminum alloy plates 3. The required number and geometric dimensions of the alloy main beams 2 and the cantilever support beams can be roughly determined according to the vibration frequency of the building main body under external excitation to adjust the number of connected alloy main beams 2. In order to ensure that the multiple alloy main beams 2 are firmly connected when the multi-wing cantilever damper vibrates, it should be ensured that there are 3 or more rows of bolts 6 connected between the two aluminum alloy plates 3 and the alloy main beams 2. The material of the aluminum alloy plate 3 is light alloy aluminum, and the elastic modulus of the aluminum alloy plate 3 should be 70GPa~80GPa.

[0014] All connection methods are not limited to bolt 6 connection and weld connection. The parts with bolt 6 connection shall use M8.8 grade high-strength bolts or higher strength bolts. Multi-wing cantilever dampers are arranged in the middle and high parts of the building body. They should be arranged parallel and symmetrically at the same level and in both horizontal directions. They can be installed horizontally and vertically or vertically through external supports, so as to achieve energy dissipation and vibration reduction in multiple vibration directions. The proportion of each damper to the total mass of the structure ranges from 0.1% to 1%.

[0015] The end of the alloy main beam 2 is welded to the fixed steel plate 8 and the fixed steel plate 8 is fixedly connected to the towering structure by bolts 6. The entire multi-wing cantilever damper is attached to the outer surface of the building structure and will not have much impact on the original structure.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] 1) The alloy main beam 2 and cantilever support beam used in the present invention have fatigue-resistant metal blocks 1 at their ends, so that the damper has sufficient fatigue resistance during vibration, thereby greatly improving the service life of the damper.

[0018] 2) In the present invention, the connecting member between the alloy main beams 2 is clamped by an aluminum alloy plate 3, and a cantilever perforated fiber reinforced damping composite beam 4 is used to ensure that the damping and stiffness of the structure are high, and the integrity and stability of the entire damper fully meet the use requirements.

[0019] 3) The multi-wing cantilever support beam design and the connection with the particle mass tuning ball 5 in the present invention enable the entire invention to dissipate energy not only through swinging under wind load or earthquake, but also through collision and friction between the particle steel balls 7 and between the particle steel balls 7 and the cavity, thereby achieving the purpose of composite vibration reduction.

[0020] 4) The present invention occupies a small space, has a wide range of applications, is low in cost and highly feasible, and can be directly installed on the surface of a variety of structural bodies in any direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall diagram of a multi-wing suspension damper with composite vibration reduction function.

[0022] Figure 2 It is a top view of the multi-wing cantilever damper with composite vibration reduction function of the present invention.

[0023] Figure 3 It is a side view of the multi-wing cantilever damper with composite vibration reduction function of the present invention.

[0024] Figure 4 It is a front view of the multi-wing cantilever damper with composite vibration reduction function of the present invention.

[0025] Figure 5 This is a cross-sectional view of the particle mass tuning sphere of the present invention.

[0026] Figure 6 This is a detailed view of the connection of the alloy main beam of the present invention.

[0027] Figure 7 One of the vertical vibration reduction forms of multi-wing suspension damper with composite vibration reduction function.

[0028] Figure 8 One of the horizontal vibration reduction forms of multi-wing suspension damper with composite vibration reduction function.

[0029] Fig. 9 One of the horizontal vibration reduction forms of multi-wing suspension damper with composite vibration reduction function.

[0030] Fig.10 Schematic diagram of the specific installation of a multi-wing suspension damper with composite vibration reduction function.

[0031] In the figure: 1 - fatigue-resistant metal block, 2 - alloy main beam, 3 - aluminum alloy plate, 4 - cantilever perforated fiber reinforced damping composite beam, 5 - particle mass tuning ball, 6 - bolt, 7 - particle steel ball, 8 - consolidation steel plate. DETAILED DESCRIPTION Example

[0032] The following further illustrates the specific implementation modes in conjunction with the accompanying drawings. It should be understood that the following specific implementation modes are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that these drawings only describe certain significant features and are not necessarily drawn to scale, so the drawings should not be relied upon for scaling.

[0033] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] As attached Figure 1 To Attachment Figure 5 As shown, a multi-wing cantilever damper with a composite vibration reduction function of the present invention mainly comprises: an anti-fatigue metal block 1, an alloy main beam 2, an aluminum alloy plate 3, a cantilever perforated fiber-reinforced damping composite beam 4, a particle mass tuning ball 5 and a particle steel ball 7. One end of the first alloy main beam 2 is welded to the anti-fatigue metal block 1, and the other end is connected to another alloy main beam 2 through the aluminum alloy plate 3. The cantilever support beam is formed by connecting the cantilever perforated fiber-reinforced damping composite beam 4 and the anti-fatigue metal block 1, connecting the alloy main beam 2 to the cantilever support beam in a multi-wing shape, and connecting the particle mass tuning ball 5 to the cantilever support beam.

[0035] The specific implementation steps are as follows:

[0036] The alloy main beam is made of alloy steel with a steel quality grade of Q345, and the fatigue-resistant metal block is made of titanium alloy. The long and short side dimensions of the alloy main beam are 500mm×150mm×50mm, and the long and short side dimensions of the fatigue-resistant metal block connected to the alloy main beam are 100mm×150mm×50mm. The steel skeleton is selected to be three alloy main beams connected by aluminum alloy plates. The ends of the two alloy main beams at the connection are cut in half along the thickness horizontally at 100mm to facilitate docking and fixing. Four bolt holes are punched in two rows and two columns at equal intervals at 25mm and 75mm from the ends, and two holes are punched in one row and two columns at 125mm from the ends. The two upper and lower aluminum alloy plates used for connection are 200mm×150mm×5mm in size and are punched with eight bolt holes in four rows and two columns at equal intervals. The second and third rows of bolt holes in the middle are connected to the bolt holes at 25mm and 75mm at the ends of the alloy main beam. The first and fourth rows of bolt holes on the upper and lower aluminum alloy plates are respectively connected and reinforced with the bolt holes at 125mm of the two alloy main beams. All bolted joints are connected with 8.8-grade high-strength bolts.

[0037] The long and short side dimensions of the cantilever beam are 700mm×100mm×20mm, and the long and short side dimensions of the fatigue-resistant metal block connected to the cantilever beam are 100mm×100mm×20mm. The cantilever perforated fiber reinforced damping composite beam in the cantilever beam is a new type of component with upper and lower layers of resin skin and the middle layer is a combination of perforated fiber and reinforced damping film. The damping film composite beam is made according to the curing process curve of carbon fiber T300 / QY8911 prepreg. The thickness of the upper and lower layers of resin skin is 7mm, the middle layer of reinforced damping film is 6mm, and for the perforated damping structure, the perforation diameter is 1.4mm, the perforation spacing is 12mm, and the damping layer area rate is 94.85%.

[0038] In addition, the alloy main beam and the anti-fatigue metal block, the cantilever support beam and the alloy main beam and the particle mass tuning ball are welded together into a whole. The diameter of the spherical shell of the particle mass tuning ball is 300mm, the thickness is 3mm, the diameter of the four largest particle steel balls is 60mm, and the diameter of the remaining particle steel balls is arbitrary. A hole with a diameter of 40mm is left on the spherical shell to facilitate the addition of the number of particle steel balls later to change its own frequency to be consistent with the vibration frequency of the main building, and finally plug the hole. To ensure the quality of welding, this work can also be carried out in the production workshop, and the connection between the alloy main beams can be installed at the construction site or later.

[0039] The ends of the alloy main beams are welded to 10mm thick fixed steel plates and fixed to the towering structure with 8.8-grade high-strength bolts. The entire multi-wing cantilever damper is attached to the outer surface of the building structure to achieve a composite vibration reduction effect of the structure.

[0040] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A multi-wing cantilever damper with a composite vibration reduction function, characterized in that: include: An anti-fatigue metal block (1), an alloy main beam (2), an aluminum alloy plate (3), a cantilever perforated fiber reinforced damping composite material beam (4), a particle mass tuning ball (5) and a particle steel ball (7); the number of the alloy main beams (2) is several and they are connected in series, one end of the first alloy main beam (2) is welded to the anti-fatigue metal block (1), and the other end is connected to another alloy main beam (2) through the aluminum alloy plate (3); the cantilever support beam is formed by connecting the cantilever perforated fiber reinforced damping composite material beam (4) and the anti-fatigue metal block (1), connecting the alloy main beam (2) and the cantilever support beam in a multi-wing shape, and the particle mass tuning ball (5) is connected to the cantilever support beam in a multi-wing shape. 5) connected to the cantilever support beam; the alloy main beam (2) and the cantilever perforated fiber reinforced damping composite material beam (4) are connected to the fatigue-resistant metal block (1), thereby improving the fatigue resistance of the multi-wing cantilever damper steel frame itself and the connection with the main structure when swinging; the cantilever perforated fiber reinforced damping composite material beam (4) is composed of two layers of resin skin, the middle layer is a combination of perforated fiber and reinforced damping film; the particle mass tuning ball (5) is composed of a spherical shell and a particle steel ball (7) inside; the multi-wing shape can enhance the energy consumption of the building main body when swinging and when the particle steel ball (7) collides and rubs in the cavity; When under the action of wind load or earthquake, the alloy main beam (2) and the cantilever support beam play a tuned vibration reduction role. The two vibrate together with the main body of the building, so that the inertial force generated by the relative movement of the multi-wing cantilever damper reacts to the main structure, thereby reducing the dynamic response of the main structure and improving the vibration resistance and safety of the entire structure.

2. The multi-wing cantilever damper with composite vibration reduction function according to claim 1, characterized in that: The number of cantilever beams is determined according to the spatial environment and vibration frequency of the main building. The multi-wing cantilever dampers are arranged in the middle and high parts of the main building, in parallel and symmetrical arrangement at the same horizontal height, and in two horizontal directions.

3. The multi-wing cantilever damper with composite vibration reduction function according to claim 2 is characterized in that: The damping layer area ratio of the intermediate layer formed by the combination of the perforated fiber and the reinforced damping film is 92% to 95%.

4. The multi-wing cantilever damper with composite vibration reduction function according to claim 1, characterized in that: The cantilever support beam has a thickness smaller than that of the alloy main beam (2); the welding parts required for the multi-wing cantilever damper are all welded with aluminum-magnesium alloy welding rods with high strength and strong fatigue resistance to ensure firm welding.

5. The multi-wing cantilever damper with composite vibration reduction function according to claim 1, characterized in that: The diameter of the particle steel ball (7) is 1 / 50 to 1 / 5 of the diameter of the spherical shell of the particle mass tuning ball (5), and 4 to 5 particle steel balls (7) with a large diameter and a plurality of particle steel balls (7) with different small diameters are placed in the spherical shell; the filling rate of the particle mass tuning ball (5) is between 30% and 50%, so that the particle mass tuning ball (5) can ensure that the number of particle steel balls (7) inside is sufficient to generate relative motion between particles under large excitation, and the friction energy consumption caused by the relative sliding between the particle steel balls (7) and between the particle steel balls (7) and the cavity, and the momentum exchange and plastic energy consumption caused by the mutual inelastic collision can reduce the vibration of the vibration-controlled structure, and under small excitation, the particles can interact with the cavity without accumulation to play the role of friction energy consumption.

6. The multi-wing cantilever damper with composite vibration reduction function according to claim 1, characterized in that: The upper and lower metal plates fixed at the connection of the alloy main beam (2) are made of aluminum alloy plates (3), ensuring that each alloy main beam (2) is effectively connected with more than three rows of bolts (6), thereby reinforcing the connection strength of the connection and ensuring the overall stability of the damper.

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