CN113863529B - Tuned viscous mass damper capable of adjusting spring stiffness coefficient - Google Patents
Tuned viscous mass damper capable of adjusting spring stiffness coefficient Download PDFInfo
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- CN113863529B CN113863529B CN202111219606.0A CN202111219606A CN113863529B CN 113863529 B CN113863529 B CN 113863529B CN 202111219606 A CN202111219606 A CN 202111219606A CN 113863529 B CN113863529 B CN 113863529B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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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
- E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
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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
- E04H9/0237—Structural braces with damping devices
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- Civil Engineering (AREA)
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- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
A tuned viscous mass damper with an adjustable spring rate includes a housing; the shell inner chamber is provided with support I and support II, support I is fixed with one of them end plate of shell, ball screw one end passes the through-hole of end plate and extends to support I inside, the spiro union has the screw on the ball screw, in the recess of screw tip is inserted to inner tube one end and both rotate the installation, the ball screw other end extends to the unthreaded hole of inner tube in, the urceolus is equipped with the inner tube outside coaxial sleeve to the screw, and inner tube and urceolus rotate the installation, screw and urceolus welded connection, the tenon of the inner tube other end cooperates with the tongue-and-groove on the support II, and inner tube and support II welded fastening simultaneously, be connected through the spring system that a plurality of springs constitute between the end plate of fixed bolster I and the ball screw. The invention has simple installation, simple structure and low cost, can achieve the effect of the traditional tuned mass damper by using a small screw nut, and has remarkable vibration reduction effect.
Description
Technical Field
The invention belongs to the technical field of vibration reduction of building structures, and particularly relates to a tuned viscous mass damper capable of adjusting spring stiffness coefficient.
Background
In recent years, a large-span structure is rapidly developed, and the large-span structure is widely applied to marking buildings such as bird nests, stadium stands and the like. The large-scale large-rise structure of the large-collapse structure is common, and in order to meet the safety and engineering requirements, the development of the damper becomes a decisive factor for solving the development of the large-span structure. At present, the viscous damper with the highest use rate in the large-span structure shows a good vibration reduction effect by adopting a mode of replacing a rod piece or connecting the structure in parallel as an accessory structure. In most researches, one of the most commonly used means is to replace the whole rod, but the viscous damper is directly exposed to the external environment, and the working stability and the service life of the damper are adversely affected by complex external environment factors such as severe weather. The special structure of the large span ensures that a large amount of overhead operation is needed to realize when various dampers are installed, and the damper has the characteristics of high operation difficulty, high labor intensity and the like, so that the development of the damper with durability and excellent performance is particularly important.
For the building engineering adopting a large-span structure, the requirements are more and more strict, and the novel structural appearance is required to ensure the sufficient stability, practicability and safety. In terms of the technical field of building construction, whether the construction technology of the whole large-span space structure is advanced or not means the building level of one country. The specificity of the large-span structure enables the large-span structure to have wind sensitivity characteristics of small vertical rigidity, relatively light mass, small structural damping and the like, and natural wind load becomes one of the factors mainly considered for the structural safety performance. Common tuned mass dampers play an important role in today's high-rise buildings, but exhibit relatively poor wind-vibration response performance for large-span structures. On the one hand, because the wind load is essentially a smooth random load, the randomness of the wind load makes the wind load difficult to stably tune, and the uncertainty of the wind load makes the common tuning mass damper limited in popularization in wind vibration; on the other hand, tuned mass dampers typically require a mass large enough to generate sufficient inertial force to counteract the energy, and are often expensive and difficult to install, which also affects their range of use.
The appearance of tuned viscous mass damper effectively expands the research of the large-span structure in the wind resistance field. The tuned mass dampers currently on the market have the limitations of use, as a large enough mass is required to tune the overall structure, the installation is not easy and the cost is expensive. In addition, the tuning range of the conventional viscous damper and tuning mass damper is difficult to control, and there is a limitation in the tuning range of the overall structure. In contrast, tuning viscous mass dampers have a relatively large control range, but still suffer from significant drawbacks.
Disclosure of Invention
The invention aims to provide a tuned viscous mass damper with an adjustable spring rate, which can expand the frequency modulation range of the damper. The parallel connection is arranged at the connecting node of various rod pieces, the inside of the self structure is completely sealed, the influence of external environmental factors such as various outside bad weather can be isolated, and the working stability and the service life of the damping vibration attenuation member are greatly improved. The spring system and the mechanical amplifying mechanism are connected in series by utilizing a structural form, and the apparent mass effect required by structural tuning can be generated by utilizing a small-weight mass system, so that the total mass of the damper is small, the risk of installation is reduced, the problems related to later maintenance are relatively reduced, the maintenance cost is reduced, and the state is quite stable.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a tuned viscous mass damper with an adjustable spring rate comprises a shell, a support I, a support II, an outer cylinder, a ball screw and an inner cylinder; the shell inner chamber is provided with support I and support II, and support I open end is fixed with one of them end plate of shell, and support II blind end is fixed with another piece end plate of shell, support I comprises cyclic annular section of thick bamboo and the end plate that has the through-hole, and cyclic annular section of thick bamboo one end is provided with the end plate that has the through-hole, ball one end passes the through-hole of end plate and extends to support I inside, and the spiro union has the screw on the ball, in the recess of screw tip is inserted to inner tube one end, and the screw through cyclic annular guide slot I on it and the corresponding cyclic annular guide rail I on the outer circle of inner tube rotate to be connected, and the ball other end extends to the unthreaded hole of inner tube, and is provided with the clearance between ball and the unthreaded hole inner wall, and the coaxial cover in inner tube outside is equipped with the urceolus, and the inner tube is through cyclic annular guide slot II on its last cyclic annular guide rail II rotate to be connected with the urceolus, welded connection between screw and the urceolus, the tenon on the inner tube other end cooperates with the tongue on the support II, and simultaneously with support II welded fastening, be connected through the spring system that a plurality of inner tube springs constitute between end plate and the ball.
The inner diameter of the unthreaded hole at the center of the inner cylinder is larger than the maximum diameter of the ball screw; the inner diameter of the through hole on the end plate of the support I is larger than the maximum diameter of the ball screw.
The length of the outer cylinder is equal to the length of the nut plus the inner cylinder.
The viscous material is filled in the closed space formed by the screw nut, the outer cylinder, the inner cylinder and the annular guide rail II.
The invention has the technical effects that:
1. the invention provides the effect of presenting a plurality of times of apparent mass with small mass by utilizing mechanical amplification mechanisms such as viscous materials between the ball screw, the inner cylinder and the outer cylinder, avoids the influence of a plurality of tuned viscous mass dampers on the dead weight of the whole structure, enlarges the frequency modulation range of the tuned viscous mass dampers by the existence of a spring system, and improves the vibration reduction efficiency of the dampers.
2. The damper has low manufacturing cost, improves the expensive cost of tuning the viscous mass damper, has a complete sealing state of the whole structure, is not influenced by external conditions, has long service life and reduces the maintenance cost. The quality is lighter when the installation, has also reduced the installation risk.
Drawings
FIG. 1 is a cross-sectional view of a tuned viscous mass damper of the present invention with an adjustable spring rate;
FIG. 2 is a left side view of a tuned viscous mass damper of the present invention with an adjustable spring rate;
the device comprises a 101-support I, a 102-support II, a 2-spring system, a 3-ball screw, a 4-screw nut, a 5-inner cylinder, a 6-viscous material, a 7-outer cylinder, an 8-tenon, a 9-shell, a 10-guide rail I and an 11-guide rail II.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, a tuned viscous mass damper with an adjustable spring rate comprises a shell 9, a support I101, a support II 102, an outer cylinder 7, a ball screw 3 and an inner cylinder 5; the inner cavity of the shell 9 is provided with a support I101 and a support II 102, the open end of the support I101 is fixed with one end plate of the shell 9, the closed end of the support II 102 is fixed with the other end plate of the shell 9, the support I101 consists of an annular cylinder and an end plate with a through hole, one end of the annular cylinder is provided with the end plate with the through hole, one end of the ball screw 3 penetrates through the through hole of the end plate to extend into the support I101, the outer circle of the end part of the ball screw 3 is provided with an annular limiting boss, the ball screw 3 is prevented from being separated from the support I101 under the condition of horizontal displacement, the ball screw 3 is in threaded connection with a screw 4, one end of the inner cylinder 5 is inserted into a groove at the end part of the screw 4, the screw 4 is in rotary connection with a corresponding annular guide rail I10 on the outer circle of the inner cylinder 5 through an annular guide groove I on the screw 4, the other end of the ball screw 3 extends into a light hole of the inner cylinder 5, the gap is arranged between the ball screw 3 and the inner wall of the unthreaded hole, the outer sides of the screw 4 and the inner cylinder 5 are coaxially sleeved with the outer cylinder 7, the inner cylinder 5 is rotationally connected with an annular guide groove II on the inner hole of the outer cylinder 7 through an annular guide rail II 11 on the inner cylinder 5, the screw 4 and the outer cylinder 7 are welded and connected, the screw 4 and the outer cylinder 7 are used as key parts of the damper, the mass of the whole structure is greatly improved by utilizing the ball screw 3 and the viscous material 6, the damper can exert apparent mass effects which are several times or even thousands times through a small mass system, a dangerous rod piece of the structure to be damped is protected from being damaged in advance because of overlarge mass load, the installation danger and the manufacturing cost of the damper are greatly reduced, a tenon 8 at the other end of the inner cylinder 5 is matched with a tenon groove on a support II 102, and simultaneously the inner cylinder 5 is welded and fixed with the support II 102, the end plate of the fixed support I101 is connected with the ball screw 3 through the spring system 2 formed by a plurality of springs, when the spring system 2 is installed, the spring axis in the spring system 2 is required to be perpendicular to the support I101, and when the spring can be effectively prevented from generating action benefit, the acting line of force is not perpendicular to the support I101 and the ball screw 3, so that the energy transmission efficiency is low, and even damage to the damper can be caused. The spring system 2 plays a vital role as an additional series structure, and the damping efficiency of the integral damper can be changed by adjusting the rigidity coefficient of the spring system 2, so that the frequency modulation range of the tuned viscous mass damper is changed without affecting the subsequent integral system. When the vibration of the whole structure is smaller, the spring system 2 can automatically perform vibration reduction, so that the limitation of the frequency modulation range of the tuned viscous mass damper is broken, the frequency modulation range of the tuned viscous mass damper is enlarged, and the vibration reduction energy consumption efficiency of the tuned viscous mass damper is improved; the vibration reduction effect of the local components is achieved, so that the service life of the whole damper is prolonged, and the maintenance cost is reduced.
The inner diameter of the unthreaded hole in the center of the inner barrel 5 is larger than the maximum diameter of the ball screw 3; the inner diameter of the through hole on the end plate of the support I101 is larger than the maximum diameter of the ball screw 3.
The length of the outer cylinder 7 is equal to the length of the nut 4 plus the inner cylinder 5.
The viscous material 6 is filled in the closed space formed by the screw 4, the outer cylinder 7, the inner cylinder 5 and the annular guide rail II 11.
A method of using a tuned viscous mass damper with an adjustable spring rate, comprising the steps of:
placing a damper at a node of one end of a dangerous rod piece of a structure to be damped, welding an end plate of one end of a shell 9 at the node, and welding the outer circular surface of the damper shell to the dangerous rod piece of the structure to be damped in parallel; when the damper is acted by external load, the external load is transmitted into the damper from the support I101, is primarily damped through the spring system 2, and is then transmitted to the ball screw 3, and as the screw 4 and the outer cylinder 7 are simultaneously and rotatably arranged with the inner cylinder 5, and the inner cylinder 5 is fixed with the support II 102, the screw 4 and the outer cylinder 7 can only rotate and can not move along the axial direction of the screw; meanwhile, the inner cylinder 5 is provided with a unthreaded hole, the inner diameter of the unthreaded hole is larger than the maximum diameter of the ball screw 3, and the unthreaded hole area provides displacement space for the ball screw 3, so that the ball screw 3 generates horizontal linear motion when receiving external load, the ball screw 3 is forced to generate horizontal displacement trend when the external load is transmitted to the ball screw 3, the nut 4 and the outer cylinder 7 connected with the ball screw 3 are further forced to generate circular motion, and meanwhile, the ball screw 3 moves to one side of the unthreaded hole to finish rotation energy consumption; simultaneously, the nut 4 and the outer barrel 7 overcome the defect that in the process of rotating the viscous material 6, external load is converted into the internal energy of the viscous material 6 to consume energy further, and at the moment, vibration energy of the vibration reduction structure is converted into shear stress and the internal energy of the viscous material 6 between the inner barrel 5 and the outer barrel 7, so that external energy is consumed and the structure is reduced.
The damper of the invention has a closed structure, and the shell 9 is a cylinder made of stainless steel. When external loads come, the overall structure will generate a lot of energy due to vibrations, which is transferred to the tuned viscous mass damper via the support i 101 and the support ii 102, which the spring system 2 can perform for the first time damping. Such tuned viscous mass dampers consume external energy through springs, a mechanical amplification mechanism of the viscous material 6, and inertial and resistive forces provided by some devices that are significantly larger in apparent mass than the actual mass effect.
Claims (3)
1. A tuned viscous mass damper with an adjustable spring rate is characterized by comprising a shell, a support I, a support II, an outer cylinder, a ball screw and an inner cylinder; the inner cavity of the shell is provided with a support I and a support II, the opening end of the support I is fixed with one end plate of the shell, the closed end of the support II is fixed with the other end plate of the shell, the support I consists of an annular cylinder and an end plate with a through hole, one end of the annular cylinder is provided with the end plate with the through hole, one end of the ball screw penetrates through the through hole of the end plate to extend into the support I, the ball screw is screwed with a screw nut, one end of the inner cylinder is inserted into a groove at the end part of the screw nut, the screw nut is in rotary connection with a corresponding annular guide rail I on the excircle of the inner cylinder through an annular guide groove I on the screw nut, the other end of the ball screw nut extends into a unthreaded hole of the inner cylinder, a gap is arranged between the ball screw nut and the inner cylinder, the outer side of the screw nut and the inner cylinder are coaxially sleeved with an outer cylinder, the inner cylinder is in rotary connection with the annular guide groove II on the inner cylinder through the annular guide rail II, a tenon at the other end of the inner cylinder is matched with a tenon on the support II, and simultaneously the end plate of the fixed support I is connected with the ball screw nut through a spring system formed by a plurality of inner cylinders; the viscous material is filled in the closed space formed by the screw nut, the outer cylinder, the inner cylinder and the annular guide rail II.
2. A tuned viscous mass damper with adjustable spring rate as defined in claim 1, wherein: the inner diameter of the unthreaded hole at the center of the inner cylinder is larger than the maximum diameter of the ball screw; the inner diameter of the through hole on the end plate of the support I is larger than the maximum diameter of the ball screw.
3. A tuned viscous mass damper with adjustable spring rate as defined in claim 1, wherein: the length of the outer cylinder is equal to the length of the nut plus the inner cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219606.0A CN113863529B (en) | 2021-10-20 | 2021-10-20 | Tuned viscous mass damper capable of adjusting spring stiffness coefficient |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219606.0A CN113863529B (en) | 2021-10-20 | 2021-10-20 | Tuned viscous mass damper capable of adjusting spring stiffness coefficient |
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| Publication Number | Publication Date |
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| CN113863529A CN113863529A (en) | 2021-12-31 |
| CN113863529B true CN113863529B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111219606.0A Active CN113863529B (en) | 2021-10-20 | 2021-10-20 | Tuned viscous mass damper capable of adjusting spring stiffness coefficient |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105155708B (en) * | 2015-07-10 | 2017-07-28 | 同济大学 | The viscid mass damper of one kind tuning |
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