Impact tuned liquid mass damper and design method

Abstract

The present application relates to the technical field of impact damper, and provides an impact tuned liquid mass damper and a design method, wherein the impact tuned liquid mass damper comprises a mounting base and a liquid container movably connected with the mounting base, the liquid container can move along a first direction relative to the mounting base; a first stopper is connected with the mounting base, the first stopper is located on one side of the liquid container along the first direction, and a viscoelastic material layer is arranged on the side of the first stopper facing the liquid container; an elastic element is connected between the mounting base and the liquid container, and the elastic element can drive the liquid container to abut against the viscoelastic material layer. The present application can overcome the technical problems that the existing impact tuned mass damper provides mass through a steel plate or a steel block, and can only dissipate energy through the impact of the viscoelastic material, resulting in high manufacturing cost and load on the building structure, and limited energy dissipation capacity, and the optimal damping ratio requirement cannot be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of impact dampers, in particular to an impact tuned liquid mass damper and a design method. BACKGROUND

[0002] In order to suppress the vibration of a bridge, a footbridge, a building structure and the like caused by internal load or external load, a damping device such as a tuned mass damper (TMD) is often installed in the existing building structure; the conventional TMD system includes a viscous tuned mass damper (VTMD), a magneto-rheological tuned mass damper (MRTMD), a frictional tuned mass damper (FTMD), an eddy current tuned mass damper (ECTMD) and the like.

[0003] However, the above dampers have some disadvantages in practice, for example, the VTMD has the problem of oil leakage and cannot adapt to high-frequency vibration; the magneto-rheological fluid of the MRTMD is prone to leakage after long-term operation, thereby causing performance degradation; the material of the FTMD needs to be replaced regularly due to severe frictional wear, and the damping performance of the FTMD can only be exerted when the controlled structure has a large vibration amplitude; the damping coefficient of the ECTMD is reduced at high speed or high temperature and the ECTMD is expensive.

[0004] In recent years, a new type of impact tuned mass damper (PTMD) based on the impact damping energy dissipation of a viscoelastic (VE) material has developed rapidly, which generally includes a movable mass block, and viscoelastic material layers are arranged on both sides of the mass block along its activity freedom degree; when the building structure vibrates, the mass block will displace relative to the viscoelastic material layers and collide with the viscoelastic material layers, thereby dissipating the mechanical energy of vibration through the collision of the mass block and the viscoelastic material layers. However, at present, the mass of the PTMD is usually provided by a steel block or a steel plate; if the energy dissipation effect of the PTMD is to be enhanced, the amount of the steel block or the steel plate needs to be increased, thereby causing the mass of the PTMD to increase, which on one hand causes the load on the building structure generated by the self-weight of the PTMD to increase sharply, and on the other hand causes the manufacturing cost of the PTMD to increase; in addition, the conventional PTMD often cannot meet the requirement of optimal damping ratio due to the limited energy dissipation capacity of the collision of the viscoelastic material, thereby causing the vibration reduction performance to decrease significantly, and therefore a new type of impact tuned mass damper needs to be developed. SUMMARY

[0005] The present application aims to overcome the technical problems that the existing impact tuned mass damper provides mass by a steel plate or a steel block and can only dissipate energy through the collision of a viscoelastic material, thereby causing the manufacturing cost and the load on the building structure to be high, and the energy dissipation capacity is limited and the requirement of optimal damping ratio cannot be met, and provides an impact tuned liquid mass damper and a design method.

[0006] In a first aspect, the present application provides a collision-tuned liquid mass damper, comprising:

[0007] a mounting base;

[0008] a liquid container, the liquid container comprising at least one cavity for containing liquid, the liquid container being movably connected to the mounting base, and the liquid container being movable relative to the mounting base along a first direction;

[0009] a first stopper, the first stopper being connected to the mounting base, the first stopper being located at one side of the liquid container along the first direction, and a layer of viscoelastic material being provided on the side of the first stopper facing the liquid container;

[0010] a resilient element, the resilient element being connected between the mounting base and the liquid container, and the resilient element being capable of driving the liquid container to abut against the layer of viscoelastic material.

[0011] The collision-tuned liquid mass damper of the present application comprises a collision-tuned mass damper formed by the resilient element, the liquid container and the first stopper. In use, the mounting base is connected to a controlled structure, such as a bridge or a building, and the cavity is filled with liquid, such as water or damping oil. When the controlled structure vibrates, the liquid container and the liquid inside the liquid container repeatedly collide with the layer of viscoelastic material on the first stopper under the action of inertia and the resilient element, thereby dissipating the vibration mechanical energy of the controlled structure into internal energy of the layer of viscoelastic material and the liquid, and playing a role of vibration reduction. It can be seen that the liquid container and the liquid together play the role of the mass block in a conventional PTMD, i.e., the mass of the present application is provided by the liquid container and the liquid together. Therefore, under the condition of the same total mass, the liquid container of the present application has a lower mass than the mass block of the prior art, thereby being able to obtain lower material consumption and corresponding manufacturing cost.

[0012] Meanwhile, when the liquid container repeatedly collides with the layer of viscoelastic material, the liquid inside the liquid container also flows relative to the liquid container under the action of inertia, such as the flow inside the liquid and the flow of the liquid relative to the inner wall of the liquid container, thereby being able to generate viscous force between the liquid and between the liquid and the liquid container, and further being able to provide additional damping for the present application and dissipate the vibration mechanical energy of the controlled structure together with the layer of viscoelastic material. Therefore, under the condition of the same total mass, the present application has a better damping effect than the conventional PTMD. Or conversely, the present application can obtain the same damping effect as the conventional PTMD under the condition of a lower total mass, thereby being able to reduce the load generated by the present application on the controlled structure.

[0013] And in the traditional PTMD, the viscoelastic material layer is arranged on both sides of the mass, in order to enable the mass to move relative to the viscoelastic material layer and impact the viscoelastic material layer, there is a gap between the mass and the viscoelastic material layer, which needs to match the vibration amplitude of the controlled structure, so the design is more complicated; And the fixed gap can only keep the damping effect in the best state under certain working conditions, when facing random loads such as earthquakes and winds, it is easy to cause the mass to be unable to collide with the viscoelastic material layer due to the mismatch between the amplitude of the controlled structure and the gap, or the collision force is too large. And the scheme only sets a viscoelastic material layer on one side of the liquid container, and drives the liquid container to abut against the viscoelastic material layer through the elastic element, which is equivalent to eliminating the gap between the mass and the viscoelastic material layer. As long as the liquid container can displace relative to the viscoelastic material layer, the liquid container can be reset and collide with the viscoelastic material layer under the action of the elastic element, thereby dissipating the vibration mechanical energy of the controlled structure, and will not be limited by the amplitude of the controlled structure. Therefore, the scheme has a wider working interval than the traditional PTMD, can keep the damping effect under various amplitude conditions, and is conducive to simplifying the design of the PTMD.

[0014] Preferably, the cavity is filled with liquid, and the volume of the liquid is less than the volume of the cavity.

[0015] The scheme makes the liquid unable to fill the cavity, and when the liquid container repeatedly collides with the viscoelastic material layer, in addition to the flow inside the liquid and the flow of the liquid relative to the inner wall of the liquid container, the liquid surface will also oscillate relative to the liquid container, thereby generating a reaction force on the liquid container to suppress the vibration of the liquid container. That is, the scheme can further increase the damping effect that the liquid can produce under the condition that the mass of the liquid is the same; or vice versa, it is conducive to reducing the total mass of the scheme under the condition that the damping effect is the same.

[0016] Preferably, the side of the liquid container facing the first stopper is provided with a collision head, and the collision head protrudes towards the first stopper relative to the side wall of the liquid container.

[0017] The scheme can prevent the liquid container from directly colliding with the viscoelastic material layer, thereby avoiding damage to the liquid container due to collision, and further preventing the liquid from leaking.

[0018] Preferably, the side of the collision head facing the liquid container is a circular arc surface.

[0019] The scheme is conducive to more evenly distributing the impact on the collision head to all parts of the liquid container, avoiding the situation that local stress concentration causes damage to the collision head or the liquid container.

[0020] Preferably, the collision head and the liquid container are detachably connected.

[0021] The scheme can facilitate workers to replace the damaged collision head.

[0022] Preferably, the mounting base is provided with a slide rail, and a length direction of the slide rail is arranged along the first direction; and the liquid container is provided with a pulley, and the pulley is capable of rolling on the slide rail.

[0023] The scheme can induce the liquid container to always run stably along the length direction of the slide rail through the slide rail and the pulley, so that the liquid container can always impact the viscoelastic material layer in a fixed posture, thereby playing a predetermined damping effect, and avoiding the situation that the motion of the liquid container deviates due to external disturbances, internal liquid sloshing and other factors, so that the liquid container cannot impact the viscoelastic material layer in a predetermined posture.

[0024] Compared with other guide mechanisms, such as a slide rail and a slide block mechanism, the pulley and slide rail structure has lower requirements for geometric tolerances of components, and is not prone to be stuck due to deformation of the components, and is more suitable for the situation that the liquid container generates stress in various directions on the pulley and the slide rail when the liquid in the liquid container sloshes, thereby causing local deformation of the pulley and the slide rail.

[0025] Preferably, at least two slide rails are respectively distributed on two sides of the liquid container.

[0026] The scheme can simultaneously limit the liquid container from two sides of the liquid container, thereby further increasing the stability of the motion of the liquid container.

[0027] Preferably, the viscoelastic material layer is detachably connected with the first stopper.

[0028] The scheme can facilitate replacement of a damaged viscoelastic material layer by a worker.

[0029] Preferably, the mounting base is further connected with a second stopper, the second stopper is located on a side of the liquid container away from the first stopper, and two ends of the elastic element are respectively connected to the second stopper and the liquid container.

[0030] The scheme provides one specific arrangement of the elastic element, which is beneficial to arranging the elastic element in a direction parallel to the first direction, thereby fully exerting the elastic force of the elastic element and simplifying the stress analysis and design steps of the elastic element.

[0031] Preferably, the material of the viscoelastic material layer includes at least one of rubber, foamed plastic or knitted cotton.

[0032] The scheme recommends three specific materials of the viscoelastic material layer.

[0033] In a second aspect, the scheme provides a design method of a collision type tuned liquid mass damper, which is applied to the collision type tuned liquid mass damper, and includes the following steps:

[0034] initially determining the total mass of the impact-tuned liquid mass damper and the liquid volume in the liquid container, and calculating the mass ratio of the impact-tuned liquid mass damper to the controlled structure;

[0035] removing the first stopper, adding a sloshing baffle in the liquid container to limit the liquid sloshing, or fixing a mass block of equal mass in the liquid container to replace the liquid, and performing a free vibration test on the impact-tuned liquid mass damper to obtain the self-inherent damping ratio of the impact-tuned liquid mass damper; removing the sloshing baffle or the mass block, and applying white noise excitation to the impact-tuned liquid mass damper to obtain the liquid surface response of the liquid; and calculating the liquid sloshing additional damping ratio;

[0036] According to the mass ratio and the liquid sloshing additional damping ratio, the optimal elastic recovery coefficient is calculated, and the optimal design frequency is calculated according to the mass ratio and the vibration frequency of the controlled structure.

[0037] In the impact-tuned liquid mass damper provided by the present application, the total additional damping ratio is provided by the movement of the liquid container and the liquid, the oscillation of the liquid in the liquid container, and the collision of the liquid container and the layer of viscoelastic material; however, the movement of the liquid container and the liquid, the oscillation of the liquid in the liquid container, and the collision of the liquid container and the layer of viscoelastic material interact with each other, making it difficult to accurately obtain and calculate each component of the total additional damping ratio provided by the impact-tuned liquid mass damper, and further causing difficulties in the design of the impact-tuned liquid mass damper.

[0038] The design method of the impact-tuned liquid mass damper of the present application first eliminates the influence of the layer of viscoelastic material and the liquid oscillation by removing the first stopper and setting the sloshing baffle, respectively, so as to more simply and accurately obtain the self-inherent damping ratio of the impact-tuned liquid mass damper; then the sloshing baffle is removed and white noise excitation is applied to the impact-tuned liquid mass damper, so as to obtain the liquid surface response of the liquid, and accurately obtain the liquid sloshing additional damping ratio according to the liquid surface response and the self-inherent damping ratio, which can be used to calculate the optimal elastic recovery coefficient and the optimal design frequency, and guide the design of the impact-tuned liquid mass damper, such as adjusting the stiffness of the elastic element, or adjusting the material and thickness of the layer of viscoelastic material, so as to make the impact-tuned liquid mass damper as close as possible to the optimal design parameters, and maximize the damping effect.

[0039] Preferably, the liquid sloshing additional damping ratio is calculated according to the following formula:

[0040]

[0041] In the formula, ζ eff represents the liquid sloshing additional damping ratio; f sζ represents the inherent damping ratio of the impact-tuned liquid mass damper; f represents frequency. s ζ represents the inherent damping ratio of the impact-tuned liquid mass damper; f represents frequency.

[0042] Preferably, the optimal elastic recovery coefficient is calculated according to the following formula:

[0043]

[0044] In the formula, e opt ζ represents the inherent damping ratio of the impact-tuned liquid mass damper; f represents frequency. eff ζ represents the inherent damping ratio of the impact-tuned liquid mass damper; f represents frequency.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] 1. The present application provides an impact-tuned liquid mass damper, which is composed of an elastic element, a liquid container and a first stopper, and the liquid container can be filled with liquid to provide additional mass and damping. Compared with the traditional PTMD, the present application has lower mass under the same damping effect, thereby achieving lower material consumption and corresponding manufacturing cost, and reducing the load generated by the present application on the controlled structure.

[0047] 2. The present application provides a design method of the impact-tuned liquid mass damper, which first removes the first stopper and sets a anti-slosh baffle to obtain the inherent damping ratio excluding the influence of the viscoelastic material layer and liquid oscillation, then removes the anti-slosh baffle and applies white noise excitation to obtain the liquid surface response, and finally obtains the accurate liquid oscillation additional damping ratio according to the liquid surface response and the inherent damping ratio, so as to calculate the optimal elastic recovery coefficient and the optimal design frequency, and guide the design of the impact-tuned liquid mass damper, so that the impact-tuned liquid mass damper can be as close as possible to the optimal design parameters to maximize the damping effect. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a side view structural schematic of an impact-tuned liquid mass damper of the present application Figure 1 ;

[0049] Figure 2 is a side view structural schematic of an impact-tuned liquid mass damper of the present application Figure 2 ;

[0050] Figure 3 is a mechanical principle schematic of an impact-tuned liquid mass damper of the present application

[0051] Figure 4 Figure 1 is a flow chart of a design method of a collision type tuned liquid damper according to the present application;

[0052] Figure 1 is a flow chart of a design method of a collision type tuned liquid damper according to the present application; DETAILED DESCRIPTION

[0053] The application will be further described in conjunction with test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the application is limited to the following examples, and any technology realized based on the content of the application falls within the scope of the application.

[0054] In the description of the specific embodiments of the application, the orientation or positional relationship terms such as "up", "down", "left", "right", "center", "inner", "outer", and the like, are expressed based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / apparatus is usually used. These orientation or positional relationship terms are only for the convenience of describing the application scheme or simplifying the description in the specific embodiments, for the convenience of the technical personnel to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore cannot be understood as a limitation on the application.

[0055] In addition, if the terms "horizontal", "vertical", "vertical", "overhanging", "parallel", and the like appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is set in the "horizontal", "vertical", "overhanging", "parallel" direction, and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the application scheme.

[0056] In addition, the terms "first", "second", "third", and the like appear in the terms, which are only used to distinguish the description of the same or similar parts, and should not be understood as emphasizing or implying the relative importance of the specific parts.

[0057] In addition, in the description of the embodiments of the present application, "several" "a plurality of" "several" represents at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. Any case, it can even be more than 9 cases.

[0058] In addition, in the description of the technical solutions of the present application, unless otherwise specified / limited / limited, the terms "set", "install", "connect", "connect", "set", "lay", "arrange" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication between two elements.

[0059] Embodiment 1

[0060] As shown in Figures 1 to 2 , a collision type tuning liquid mass damper includes a mounting base 1, a liquid container 2, a first stop 3 and an elastic element 5; the mounting base 1 is used to connect with the controlled structure 10; the liquid container 2 includes at least one cavity for containing liquid, the liquid container 2 is movably connected with the mounting base 1, and the liquid container 2 can move relative to the mounting base 1 in a first direction, for example Figure 1 The direction indicated by the arrow X; the first stop 3 is connected with the mounting base 1, and the first stop 3 is located on one side of the liquid container 2 in the first direction, and a viscoelastic material layer 6 is arranged on the side of the first stop 3 facing the liquid container 2; the elastic element 5 is connected between the mounting base 1 and the liquid container 2, and the elastic element 5 can drive the liquid container 2 to abut against the viscoelastic material layer 6.

[0061] It should be noted that, since the cavity is located inside the liquid container 2, Figure 1 The liquid container 2 is translucent to show the cavity and liquid inside; and Figure 1 is a schematic view of the liquid container 2 abutting against the viscoelastic material layer 6 under the driving of the elastic element 5 when the controlled structure 10 does not vibrate; Figure 2 is a schematic view of the liquid container 2 moving away from the viscoelastic material layer 6 under the action of inertia after the controlled structure 10 vibrates, and then the liquid container 2 can be reset to Figure 1 The state under the driving of the elastic element 5 and collides with the viscoelastic material.

[0062] In the above embodiments, the connection between the mounting base 1 and the controlled structure 10 includes but is not limited to: providing a pre-embedded steel structure in the controlled structure 10, connecting the mounting base 1 and the pre-embedded steel structure through a threaded connection, or directly welding the mounting base 1 and the pre-embedded steel structure; fixing the mounting base 1 to the controlled structure 10 through an anchor bolt; directly integrating the mounting base 1 and the controlled structure 10, such as integrated pouring; the controlled structure 10 includes but is not limited to a bridge, a footbridge, and a building.

[0063] In the above embodiments, the specific structure of the first stop 3 includes but is not limited to a baffle, a block, and a rod; the first stop 3 and the mounting base 1 can be two independent components connected to each other, or two parts on an integrated component.

[0064] In the above embodiments, the elastic element 5 includes but is not limited to a coil spring, a rubber block, a leaf spring, a disc spring, and other components capable of providing elastic force, and the number of the elastic element 5 can be one or more than one; the specific position of the elastic element 5 is matched with the direction of the elastic force of the elastic element 5, for example: if the elastic element 5 is a compression spring, the elastic element 5 is connected to the side of the liquid container 2 away from the viscoelastic material layer 6; if the elastic element 5 is a tension spring, the elastic element 5 is connected to the side of the liquid container 2 facing the viscoelastic material layer 6; the axis of the elastic element 5 can be parallel to the first direction, or can have an angle relative to the first direction.

[0065] In optional embodiments, as shown in Figure 1 the cavity is filled with a liquid, and the volume of the liquid is less than the volume of the cavity, i.e., the liquid does not fill the cavity.

[0066] In optional embodiments, the side of the liquid container 2 facing the first stop 3 is provided with a collision head 7, and the collision head 7 protrudes towards the first stop 3 relative to the side wall of the liquid container 2.

[0067] In optional embodiments, the side of the collision head 7 facing the liquid container 2 is a circular arc surface. The types of the curved surface of the circular arc surface include but are not limited to a spherical surface, an elliptical spherical surface, a cylindrical surface, and an elliptical cylindrical surface; for example Figure 1 and Figure 2 as shown, the collision head 7 is a semicircular spherical surface.

[0068] In optional embodiments, the collision head 7 and the liquid container 2 are detachably connected. The specific ways of detachable connection include but are not limited to threaded connection, mortise and tenon connection, bolt connection, and buckle connection.

[0069] In optional embodiments, the mounting base 1 is provided with a sliding rail 8, and the length direction of the sliding rail 8 is along the first direction; the liquid container 2 is provided with a pulley 9, and the pulley 9 can roll on the sliding rail 8.

[0070] In optional embodiments, at least two sliding rails 8 are arranged on two sides of the liquid container 2 respectively. For example Figure 1 and Figure 2 As shown in the figure, at least one sliding rail 8 is arranged on each side of the liquid container 2 along the direction indicated by the arrow Y.

[0071] In optional embodiments, only one pulley 9 is arranged on each side of the liquid container 2 facing the sliding rail 8. For example Figure 2 As shown in the figure, when the sliding rails 8 are arranged on the upper and lower sides of the liquid container 2 respectively, one pulley 9 is arranged on each side of the liquid container 2. On the one hand, this can reduce the number and cost of the pulleys 9. On the other hand, this can also ensure that the pulleys 9 and the sliding rails 8 do not limit the rotation freedom of the liquid container 2. When the liquid in the liquid container 2 shakes due to inertia and generates a load on the liquid container 2, the liquid container 2 can rotate relative to the sliding rail 8 to some extent, so that all the load is not transmitted to the sliding rail 8, thereby facilitating the extension of the service life of the sliding rail 8.

[0072] In optional embodiments, a rim is arranged on each side of the pulley 9 along the axis of the pulley 9. The rims on the two sides can abut the corresponding side surfaces of the sliding rail 8 respectively, thereby preventing the pulley 9 from being separated from the sliding rail 8 along the axis of the pulley 9.

[0073] In optional embodiments, the viscoelastic material layer 6 is detachably connected to the first stopper 3. The specific ways of detachable connection include but are not limited to threaded connection, mortise and tenon connection, bolt connection, buckle connection.

[0074] In optional embodiments, a second stopper 4 is further connected to the mounting base 1. The second stopper 4 is located on the side of the liquid container 2 away from the first stopper 3, and the two ends of the elastic element 5 are connected to the second stopper 4 and the liquid container 2 respectively. The specific structure of the second stopper 4 includes but is not limited to a baffle, a block, and a rod. The second stopper 4 and the mounting base 1 can be two independent components connected to each other, or two parts on an integrated component.

[0075] In optional embodiments, the material of the viscoelastic material layer 6 includes at least one of rubber, foamed plastic, and knitted cotton.

[0076] Example 2

[0077] As Figure 3The mechanical principle diagram of the impact tuned liquid damper in the embodiment 1 is shown, wherein M represents the mass of the impact tuned liquid damper itself (for example, for the impact tuned liquid damper in the embodiment 1, M includes the mass of the liquid container 2, the liquid, the impact head 7 and the pulley 9); C represents the damping coefficient of the impact tuned liquid damper; K represents the stiffness of the impact tuned liquid damper; when the liquid container 2 is displaced, the liquid in the liquid container 2 will be shaken, and then the dynamic characteristic parameters of the impact tuned liquid damper are designed as follows:

[0078] ζ pl = ζ eff + ζ n

[0079] In the formula, ζ pl represents the total additional damping ratio provided by the impact tuned liquid damper; ζ eff represents the liquid oscillation additional damping ratio provided by the liquid oscillation; ζ n represents the additional damping ratio provided by the mass of the impact tuned liquid damper itself and the layer of viscoelastic material 6.

[0080] Wherein ζ n can be represented by the following formula:

[0081]

[0082] In the formula, e represents the elastic recovery coefficient, which can be changed by changing the type and thickness of the layer of viscoelastic material 6.

[0083] Therefore, in order to obtain the accurate liquid oscillation additional damping ratio and use it to guide the design of the impact tuned liquid damper, the present application provides a design method of the impact tuned liquid damper as shown in the formula: Figure 4 The design method of the impact tuned liquid damper is applied to the impact tuned liquid damper in the embodiment 1, and includes the following steps:

[0084] S1, initially determine the total mass of the impact tuned liquid damper and the liquid volume in the liquid container 2, and calculate the mass ratio of the impact tuned liquid damper to the controlled structure 10.

[0085] S2, remove the first stop 3 and the layer of viscoelastic material 6 connected thereto, and add an anti-slosh baffle for limiting the liquid shaking in the liquid container 2, for example, for the impact tuned liquid damper in the embodiment 1, the anti-slosh baffle is a plurality of anti-slosh baffles 4 arranged in the liquid container 2. Figure 1The liquid container 2 can be divided into two independent chambers by a horizontal plate-shaped member as a anti-slosh baffle, wherein the liquid is in the lower chamber and the volume of the liquid is equal to the volume of the lower chamber, so as to suppress the sloshing of the liquid surface; or a mass block with the same mass as the liquid is fixed in the liquid container 2 to replace the liquid; the free vibration test of the impact tuned liquid damper is carried out to obtain the self inherent damping ratio of the impact tuned liquid damper.

[0086] S3, the anti-slosh baffle or the mass block is removed, the white noise excitation is applied to the impact tuned liquid damper, and the liquid surface response is obtained; the liquid oscillation additional damping ratio is calculated.

[0087] The liquid oscillation additional damping ratio can be calculated according to the following formula:

[0088]

[0089] In the formula, ζ eff represents the liquid oscillation additional damping ratio; f s represents the vibration frequency of the impact tuned liquid damper; H(f) represents the frequency response of the impact tuned liquid damper; ζ s represents the self inherent damping ratio of the impact tuned liquid damper; and f represents the frequency.

[0090] In the formula, H(f) and ζ s can be represented by the following formula respectively:

[0091]

[0092] In the formula, S(f) represents the liquid surface response power spectrum; S0 represents the white noise power spectrum; ω s represents the vibration circular frequency of the impact tuned liquid damper.

[0093] It should be noted that the parameters f s , H(f), ζ s , and ω s in the present step are the corresponding parameters of the impact tuned liquid damper in the state of removing the first stop 3.

[0094] S4, the optimal elastic recovery coefficient is calculated according to the mass ratio and the liquid oscillation additional damping ratio, the optimal design frequency is calculated according to the mass ratio and the vibration frequency of the controlled structure 10, and the design of the impact tuned liquid damper is completed.

[0095] The expressions of the optimal design parameters required for designing the impact tuned liquid damper, such as the optimal damping ratio, the optimal frequency ratio and the optimal elastic recovery coefficient, are as follows respectively:

[0096] The expressions of the optimal design parameters required for designing the impact tuned liquid damper, such as the optimal damping ratio, the optimal frequency ratio and the optimal elastic recovery coefficient, are as follows respectively:

[0097]

[0098] where ζ opt represents the optimal damping ratio; r opt represents the optimal frequency ratio; e opt represents the optimal elastic recovery coefficient; ζ eff represents the liquid oscillation additional damping ratio; μ represents the mass ratio of the impact-tuned liquid mass damper to the controlled structure 10.

[0099] And the optimal design frequency is approximately twice f s , which can be expressed as the following formula

[0100] f = f m r opt

[0101] where f represents the optimal design frequency; f m represents the vibration frequency of the controlled structure 10.

[0102] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A design method of a collision-tuned liquid mass damper, applied to a collision-tuned liquid mass damper, characterized in that: the collision-tuned liquid mass damper comprises: a mounting base (1); a liquid container (2) comprising at least one cavity for containing liquid, the liquid container (2) being movably connected to the mounting base (1) and being capable of moving along a first direction relative to the mounting base (1); a first stopper (3) connected to the mounting base (1) and located on one side of the liquid container (2) along the first direction, a layer of viscoelastic material (6) being arranged on the side of the first stopper (3) facing the liquid container (2); and an elastic element (5) connected between the mounting base (1) and the liquid container (2) and capable of driving the liquid container (2) to abut against the layer of viscoelastic material (6); the design method of the collision-tuned liquid mass damper comprises the following steps: initially determining the total mass of the collision-tuned liquid mass damper and the volume of liquid in the liquid container (2), and calculating the mass ratio of the collision-tuned liquid mass damper to a controlled structure; removing the first stopper (3), adding an anti-slosh baffle in the liquid container (2) to limit liquid sloshing, or fixing a mass block of equal mass in the liquid container (2) to replace the liquid; performing a free vibration test on the collision-tuned liquid mass damper to obtain the inherent damping ratio of the collision-tuned liquid mass damper; removing the anti-slosh baffle or the mass block, and applying white noise excitation to the collision-tuned liquid mass damper to obtain the liquid surface response of the liquid; and calculating the liquid sloshing additional damping ratio; and calculating the optimal elastic recovery coefficient according to the mass ratio and the liquid sloshing additional damping ratio, and calculating the optimal design frequency according to the mass ratio and the vibration frequency of the controlled structure. The cavity is filled with liquid, and the volume of the liquid is less than the volume of the cavity. One side of the liquid container (2) facing the first stopper (3) is provided with a collision head (7) protruding towards the first stopper (3) relative to the side wall of the liquid container (2). The side of the collision head (7) facing the liquid container (2) is a circular arc surface. The mounting base (1) is provided with a slide rail (8) having a length direction along the first direction; and the liquid container (2) is provided with a pulley (9) capable of rolling on the slide rail (8). At least two slide rails (8) are respectively distributed on both sides of the liquid container (2). The mounting base (1) is further connected with a second stopper (4) located on the side of the liquid container (2) away from the first stopper (3), and both ends of the elastic element (5) are connected to the second stopper (4) and the liquid container (2), respectively. The liquid sloshing additional damping ratio is calculated according to the following formula: The optimal elastic recovery coefficient is calculated according to the following formula: ​ 2. A design method of a bump tuned liquid mass damper according to claim 1, wherein ​ 3. The method of designing a bump tuned liquid mass damper according to claim 1, wherein ​ 4. A design method of a bump tuned liquid mass damper according to claim 3, wherein ​ 5. A design method of a bump tuned liquid mass damper according to any one of claims 1 to 4, characterized in that, ​ 6. A design method of a bump tuned liquid mass damper according to claim 5, wherein ​ 7. A design method of a bump tuned liquid mass damper according to any one of claims 1 to 4, characterized in that, ​ 8. The method of designing a bump tuned liquid mass damper according to claim 1, wherein, ​ wherein represents the liquid oscillation additional damping ratio; represents the vibration frequency of the impact tuned liquid mass damper; represents the frequency response of the impact tuned liquid mass damper; represents the self inherent damping ratio of the impact tuned liquid mass damper; represents the frequency.

9. The method of designing a bump tuned liquid mass damper according to claim 1, wherein, ​ wherein represents the optimum elastic restoring coefficient; represents the liquid oscillation additional damping ratio; represents the mass ratio of the impact tuned liquid mass damper to the controlled structure.

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