CN112982704B - Series-parallel tuned inerter damper - Google Patents
Series-parallel tuned inerter damper Download PDFInfo
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- CN112982704B CN112982704B CN202110170736.3A CN202110170736A CN112982704B CN 112982704 B CN112982704 B CN 112982704B CN 202110170736 A CN202110170736 A CN 202110170736A CN 112982704 B CN112982704 B CN 112982704B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
Abstract
The invention provides a series-parallel tuned inertial mass damper, comprising: the shearing rotating part is arranged on the shell body, the shearing rotating part is arranged on the shearing rotating part, the spiral rod is arranged on the shearing rotating part, the shell body is provided with a cavity, an inner supporting sleeve is arranged at the bottom of the cavity, and an accommodating space is formed between the inner wall of the shell body and the inner supporting sleeve to contain viscous media; shear the rotatable top that sets up in the cavity and be located the inner support cover of rotating member, it produces damping effect with shearing viscous medium to be equipped with rotatory section on the rotation member to cut, the hob wears to locate shell body and extend to in the sleeve to with the rotatory axial motion conversion of shearing rotating member with the hob be the rotary motion of shearing rotating member, viscous medium is because the viscous characteristic of self, the rotation section produces one and distributes in the power of pulling of whole circumference, thereby the rotating shaft has formed a very big moment of torsion, this moment of torsion is converted into a very big damping force that hinders hob axial motion again through shearing rotating member, thereby use engineering structure.
Description
Technical Field
The invention belongs to the technical field of engineering structure vibration control, and particularly relates to a series-parallel tuned inertial mass damper.
Background
The structural vibration control is a theory and engineering problem with wide application and multidisciplinary intersection, and specifically means that a certain measure is adopted to enable the dynamic response of a structure to meet a certain threshold value, namely, meet the requirements on engineering. The type of the system is various, the control targets are different, the implementation means is various, at present, the problem is paid attention at home and abroad, and scientific research and engineering personnel carry out a great deal of research, test and engineering application on the problem.
From the perspective of the control process on the external energy demand, structural vibration control can be divided into: passive structural control, active structural control, hybrid structural control, semi-active structural control. In addition to passive control, the control force in the other three control modes is generated in real time according to a certain control rule designed in advance wholly or partially according to a feedback signal, but due to delay of signal transmission and the like, error accumulation can occur, and the control method depends on external energy sources, so that the stability of a closed loop is poor. Therefore, for passive control that generates control force without feedback, it is widely used in structural vibration control at present because of its advantages such as low cost, no consumption of external energy, no influence on structural stability, and the like.
In passive control, the damper is a typical vibration reduction device, plays a main energy consumption role, and has damping and inhibiting effects on vibration of different mechanisms and modes of the cable. Conventional dampers include viscous liquid dampers, viscous shear dampers, eddy current dampers, rubber dampers, and the like. Meanwhile, many defects are found in engineering application, such as low efficiency of a viscous liquid damper and oil leakage; the eddy current damper has low damping effect under the same volume condition, and the like. The viscous shear damper can provide a higher damping coefficient, and is an excellent damping device. However, at the same time, conventional viscous shear dampers suffer from the following disadvantages: firstly, the damper has certain internal rigidity, so that the damping effect of the damper is weakened; secondly, due to the reasons of errors of installation precision, the action of dynamic load in the structural operation stage and the like, the mutual collision of the slices inside the damper can be caused, the service life is greatly shortened, and even the device is directly failed; thirdly, the problem of asymmetric damping force is that the conventional viscous shear damper is immersed in a viscous medium when a shear plate is pressed due to vertical shear motion between a slice and the viscous medium, the shear area is increased, and the area is reduced when the shear plate is pulled, so that the asymmetry of the mechanical property of the conventional viscous shear damper in a tension and compression state is caused, and the phenomenon is most remarkable when the displacement amplitude is large.
With the trend of gradual high and large span of engineering structures, the flexibility characteristics of the damper are more prominent, and the requirements for multi-mode and wide-frequency-band vibration control are stronger, so that the above disadvantages are improved and the vibration damping effect is improved in view of the conventional viscous shear type damper, and a solution is urgently needed. The damper overcomes the weakening effect of the self rigidity of a part of dampers on the vibration damping effect; the problem of slice collision of the traditional viscous shear damper is solved; meanwhile, the problem that the damping force of the traditional viscous shear damper is asymmetric is solved. The invention is particularly suitable for a large-span flexible structure for multi-mode and wide-frequency-band vibration control.
Disclosure of Invention
Based on the above, the invention aims to provide a series-parallel tuned inertial mass damper aiming at the defects of the traditional viscous shear damper.
The technical scheme of the invention is as follows:
a series-parallel tuned inerter damper, comprising:
the series inerter comprises a shell body and an inner supporting sleeve, wherein the shell body is provided with a cavity for containing viscous media, and the inner supporting sleeve is arranged at the bottom of the cavity;
the shearing rotating piece is rotatably arranged on the inner supporting sleeve and is rotatably connected with the top of the cavity, and the shearing rotating piece is used for shearing viscous media in the cavity to generate a damping effect;
the motion conversion assembly comprises a spiral rod, a first hinge lug and a second hinge lug, wherein the first hinge lug is fixedly arranged at one end of the spiral rod, the second hinge lug is rotatably arranged at the bottom of the shell body, one end, far away from the first hinge lug, of the spiral rod penetrates through the shell body and is matched with the shearing rotating piece to convert the axial motion of the spiral rod into the rotating motion of the shearing rotating piece, and the end part of the spiral rod extends into the inner supporting sleeve.
In one embodiment, the shearing rotating member includes an inner inertial mass plate, a parallel nut and a rotating slicing plate, the screw rod is in threaded fit with the parallel nut, two shaft sides of the parallel nut are respectively and rotatably connected with the top wall of the cavity and the inner supporting sleeve through bearings, and the inner inertial mass plate and the rotating slicing plate are respectively and fixedly arranged at the upper part and the lower part of the parallel nut and rotate along with the parallel nut.
In one embodiment, the inner inerter disk is arranged in parallel with the rotating slicing disk.
Further, the top surface of the inner inerter plate is flush with the top of the nut, and the bottom surface of the rotary slicing plate is flush with the bottom of the nut.
In one embodiment, the housing body, the shear rotation member, the screw rod, the first hinge lug, and the second hinge lug are coaxially arranged.
In one embodiment, the screw rod and the parallel nut are matched in a rolling screw mode, a sliding screw mode or a static pressure screw mode.
In one embodiment, the shell body and the inner support sleeve are both cylindrical.
In one embodiment, the rotating blade disc is provided with at least one shear blade for shearing viscous medium.
In one embodiment, any one of the series-parallel inertial mass dampers of the above embodiments is applied to a multi-modal, wide-band vibration-controlled, large-span flexible structure.
The invention has the beneficial effects that: in the series-parallel tuned inerter damper, the screw rod sequentially penetrates through the shell body, the parallel nut and the inner support sleeve along the axial direction, and the axial movement of the screw rod is converted into rotary movement through the parallel nut, wherein the inner inerter disc and the rotary slicing disc are fixedly arranged at the upper part and the lower part of the parallel nut and rotate along with the parallel nut; therefore, the parallel nut, the inner inertia disc and the rotary slicing disc keep consistent movement displacement, and the three have the same displacement, so that the parallel connection of the damping part, the rigidity part and the inner inertia part on the mechanical principle is realized; and the second hinge lug is rotatably arranged at the bottom of the shell body, so that the rotation motion between the shell body and the second hinge lug is allowed, and only the vertical displacement between the shell body and the second hinge lug is limited, therefore, the displacements of the serial inertial mass piece and the second hinge lug are mutually independent, and the serial connection of the external inertial mass piece, the damping piece and the rigidity piece on the mechanical principle is realized. The novel damper can eliminate the weakening effect of the self rigidity of the damper on the vibration damping effect by connecting the inner inertia masses in parallel; by connecting the outer inerter in series, the tuning effect is achieved, the performance of the damper is greatly improved, and the damper has better multi-mode (broadband) characteristics; and through the series connection structure, the torque born by the second hinge lug under the bottom of the damper is released, and the life cycle of the damper can be prolonged.
Drawings
FIG. 1 is a schematic structural view of a series-parallel tuned inertial mass damper according to the present invention;
FIG. 2 is a schematic sectional view taken along line A-A;
FIG. 3 is a schematic sectional view taken along line B-B in FIG. 1;
FIG. 4 is a schematic diagram of the mechanical principle of the series-parallel tuned inerter damper of the present invention.
Description of reference numerals:
1-a first hinge lug; 2-a screw rod; 3-an upper bearing; 4-parallel nuts; 5-a lower bearing; 6-tandem bearings; 7-a second hinge lug; 8-outer supporting sleeve; 9-inner supporting sleeve; 10-upper disc; 11-lower disc; 12-inner inerter disk; 13-rotating the slicing disc; 14-cutting the slices; 15-viscous medium.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Referring to fig. 1 to 3, a series-parallel tuned inertial mass damper, i.e. a damping device formed by series-parallel connection of a damping member and an inertial mass, includes: the series inerter comprises a shell body and an inner supporting sleeve 9, wherein the shell body is provided with a cavity for containing viscous media 15, and the inner supporting sleeve 9 is arranged at the bottom of the cavity; the shearing rotating piece is rotatably arranged on the inner supporting sleeve 9 and is rotatably connected with the top of the cavity, the shearing rotating piece is used for shearing viscous media in the cavity to generate a damping effect, and the shearing rotating piece is positioned between the inner supporting sleeve 9 and the top wall of the shell body; the motion conversion assembly comprises a screw rod 2, a first hinge lug 1 and a second hinge lug 7, wherein the first hinge lug 1 is fixedly arranged at one end of the screw rod 2, the second hinge lug 7 is rotatably arranged at the bottom of the shell body, one end of the screw rod 2, which is far away from the first hinge lug 1, penetrates through the shell body and is in threaded fit with the shearing rotating part so as to convert the axial motion of the screw rod 2 into the rotating motion of the shearing rotating part, and the end part of the screw rod extends into the inner support sleeve 9. The invention limits the displacement track of the shearing rotating piece and only can rotate.
In one embodiment, the shell body comprises an outer supporting sleeve 8, an upper disc 10 and a lower disc 11, the upper disc 10 and the lower disc 11 are fixedly arranged at the top end and the bottom end of the outer supporting sleeve 8 respectively, the bottom of the upper disc 10 is provided with an upper bearing 3, and the top of the inner supporting sleeve 9 is provided with a lower bearing 5.
In one embodiment, the shearing rotating member comprises an inner inertia disc 12, a parallel nut 4 and a rotating slicing disc 13, the screw rod 2 axially penetrates through the upper disc 10, the upper bearing 3, the parallel nut 4, the lower bearing 5 and the inner supporting sleeve 9 in sequence, and the screw rod 2 is in threaded fit with the parallel nut 4 to convert the axial movement of the screw rod 2 into the rotating movement of the parallel nut 4. The two shaft sides of the parallel nut 4 are respectively and rotationally connected with the top wall of the cavity and the inner supporting sleeve 9 through bearings, the inner inertia disc 12 and the rotary slicing disc 13 are respectively and fixedly arranged at the upper part and the lower part of the parallel nut 4 and do rotary motion along with the parallel nut 4, and the parallel nut 4, the inner inertia disc 12 and the rotary slicing disc 13 keep consistent in motion displacement. Preferably, the inner inerter disk 12 is arranged parallel to the rotating slicing disk 13.
Further, the top surface of the inner inerter disk 12 is flush with the top of the nut, and the bottom surface of the rotating blade disk 13 is flush with the bottom of the nut.
In one embodiment, the housing body, the shear rotation member, the screw rod 2, the first hinge lug 1 and the second hinge lug 7 are coaxially arranged.
In one embodiment, the screw rod 2 and the parallel nut 4 are matched in a rolling screw mode, a sliding screw mode or a static pressure screw mode.
In one embodiment, the second hinge lug 7 is connected to the housing body by a series bearing 6 to limit vertical displacement therebetween and allow rotational movement, and a common mechanical means such as a ball bearing, a sliding bearing, or the like may be used.
In one embodiment, the housing body and the inner support sleeve 9 are both cylindrical.
In one embodiment, the rotating blade disk 13 is provided with at least one shear blade 14 for shearing a viscous medium 15.
In one embodiment, any one of the series-parallel inertial mass dampers of the above embodiments is applied to a multi-modal, wide-band vibration-controlled, large-span flexible structure.
The inerter assembly comprises a series inerter piece and a parallel inerter piece, wherein the series inerter piece consists of a shell body and an inner support sleeve 9, the parallel inerter piece is an inner inerter disc 12, and the series inerter and the parallel inerter of the inerter assembly are mutually independent in displacement; as shown in fig. 4, fig. 4 is a schematic diagram of the mechanical principle of the series-parallel tuned inertial mass damper of the present invention, and the working principle of the present invention is described as follows:
1) damping generating effect
The damper first hinge lug 1 and the damper second hinge lug 7 are connected with two components which are controlled by structure to generate relative vibration, and the structural vibration forces the screw rod 2 to do axial reciprocating motion. This motion will be converted and amplified by the motion conversion assembly into rotational motion of the inner inerter disk 12, the rotating slice disk 13, the rotating slices, etc. Due to the viscous property of the viscous medium, the drag force distributed on the whole circumference is generated on the rotating slice, so that a torque is formed on the rotating shaft, and the torque is converted into a large damping force for resisting the axial movement of the screw rod 2 through the movement conversion assembly, so as to act on an engineering structure. The damping coefficient of the ordinary viscous shear type damper is c under the condition of a certain shearing areaeThen the equivalent damping coefficient c of the novel damper of the invention is
Wherein r is the central radius of the rotary slice (14), h is the lead of the screw rod 2(2), and the value of r/h can be changed by adopting components with different sizes, so that the damper has different damping characteristics. It is noted that if the damper has an internal stiffness, the internal stiffness is multiplied by the same factor due to the axis-rotation motion conversion, i.e. the internal stiffness is multiplied by the same factor
Wherein k iseTo amplify the equivalent stiffness coefficient of the front damper.
2) Parallel inerter effect
When the inertial mass and the viscous shear type damper are connected in parallel (considering that the serial inertial mass is infinite), the force f at two ends of the parallel device can be composed of three parts of a rigidity item, an inertial mass item and a damping item
As mentioned above, k and c are equivalent stiffness coefficients of the damper after considering the translation-rotation amplification effect, and b1To account for the moment of inertia of the inner inertance plate 12 of the amplifying effect,
respectively the axial displacement, velocity and acceleration of the screw 2.
The damping term is verified by analysis and experiment
The vibration reduction effect of the damper is improved by increasing the damping force; while the stiffness term kv will bring about a weakening effect. Therefore, in consideration of the influence, the inner inertia mass disc 12 is arranged, the increased inertia mass force is always opposite to the restoring force generated by the action of rigidity, namely the inertia mass can offset the rigidity effect to a certain extent, and the vibration reduction effect is improved.
3) Series-parallel inertial mass mechanics principle and effect
The existing damper is designed for a single frequency, has low modal damping effect except the designed frequency and is difficult to adjust; meanwhile, the structural mode of the existing damper causes the unicity of the inertia mass effect, which is equal to the parallel structure in the mechanical principle, and the important structural characteristic of the inertia mass cannot be effectively utilized. Therefore, the novel damper provided by the invention provides a series-parallel connection method aiming at the problem, and fully exerts the tuning and vibration damping effects of the inertia mass through structural innovation.
According to the damper disclosed by the invention, the spiral rod 2 sequentially penetrates through the upper disc 10, the upper bearing 3, the parallel nut 4, the lower bearing 5 and the inner support sleeve 9 along the axial direction, and the axial motion of the spiral rod 2 is converted into the rotary motion through the parallel nut 4. Wherein, the inner inertia disc 12 and the rotary slicing disc 13 are arranged on the upper part and the lower part of the parallel nut 4 in parallel and do rotary motion with the parallel nut 4; therefore, the parallel nut 4, the inner inertia disc 12 and the rotary slicing disc 13 have the same displacement and realize the parallel connection of the damping piece, the rigidity piece and the inner inertia piece on the mechanical principle.
And in the series-parallel connection supporting assembly, the series bearing 6 is connected with the lower disc 11 and the lower interface, so that the rotation motion between the two is allowed, and only the vertical displacement between the two is limited, therefore, the series inertias and the second hinge lug displacement of the inertias assembly are independent, and the series connection of the outer inertias piece, the damping piece and the rigidity piece on the mechanical principle is realized.
Therefore, the mechanical principle of the damper of the invention can be seen schematically in figure 4.
Through analysis, the deformation of the novel damper is as follows
Where i is an imaginary unit, i2Where-1, ω is frequency and t is time, then the force across the new damper can be expressed as
Wherein
Wherein the content of the first and second substances,
is the damper output amplitude in the frequency domain,
the vibration amplitude of the position of the inhaul cable damper on the frequency domain is the self rigidity coefficient of the damper, c is the self damping coefficient of the damper, b1Is parallel inertia mass, b2Is a series inerter. Furthermore, the equivalent stiffness coefficient and the equivalent damping coefficient of the novel damper are as follows:
therefore, the damper greatly improves the performance of the damper through the series-parallel inertial mass structure. At b1、b2Can cover all the stay cable vibration modes under the change of (2), and has better multi-mode (wide-frequency) characteristics.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. A series-parallel tuned inerter damper, comprising:
the series inerter comprises a shell body and an inner supporting sleeve, wherein the shell body is provided with a cavity for containing viscous media, and the inner supporting sleeve is arranged at the bottom of the cavity;
the shearing rotating piece is rotatably arranged on the inner supporting sleeve and is rotatably connected with the top of the cavity, the shearing rotating piece comprises an inner inertia plate, a parallel nut and a rotating slicing plate, a spiral rod is in threaded fit with the parallel nut, two shaft sides of the parallel nut are respectively and rotatably connected with the top wall of the cavity and the inner supporting sleeve through bearings, the inner inertia plate and the rotating slicing plate are respectively and fixedly arranged at the upper part and the lower part of the parallel nut and do rotating motion along with the parallel nut, and the shearing rotating piece is used for shearing viscous media in the cavity to generate a damping effect; and
the motion conversion assembly comprises a spiral rod, a first hinge lug and a second hinge lug, wherein the first hinge lug is fixedly arranged at one end of the spiral rod, the second hinge lug is connected with the shell body through a serial bearing to limit vertical displacement between the first hinge lug and the shell body and allow rotary motion, one end, far away from the first hinge lug, of the spiral rod penetrates through the shell body and is in threaded fit with the shearing rotating piece so as to convert axial motion of the spiral rod into rotary motion of the shearing rotating piece, and the end part of the spiral rod extends into the inner supporting sleeve.
2. The series-parallel tuned inerter damper of claim 1, wherein the inner inerter disk is disposed parallel to the rotating slicing disk.
3. The series-parallel tuned inerter damper of claim 1, wherein the top surface of the inner inerter disc is flush with the top of the parallel nut and the bottom surface of the rotating chipper disc is flush with the bottom of the nut.
4. The series-parallel tuned inertance damper of claim 1, wherein the rotating blade disc is provided with at least one shear blade to shear viscous media.
5. The series-parallel tuned inerter damper of claim 1, wherein the housing body, the shear rotation member, the screw rod, the first hinge lug, and the second hinge lug are coaxially arranged.
6. The series-parallel tuned inerter damper of claim 1, wherein the screw rod and the parallel nut are threaded in a rolling screw or sliding screw or hydrostatic screw manner.
7. The series-parallel tuned inerter damper of claim 1, wherein the housing body and the inner support sleeve are cylindrical.
8. A long span flexible structure with series-parallel tuned inertial mass damper as claimed in any one of claims 1 to 7 for multi-modal, wide band vibration control.
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| CN202110170736.3A CN112982704B (en) | 2021-02-08 | 2021-02-08 | Series-parallel tuned inerter damper |
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