CN116623822B - Tuned mass damping system for spherical hydrostatic bearing - Google Patents
Tuned mass damping system for spherical hydrostatic bearing Download PDFInfo
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- CN116623822B CN116623822B CN202310918988.9A CN202310918988A CN116623822B CN 116623822 B CN116623822 B CN 116623822B CN 202310918988 A CN202310918988 A CN 202310918988A CN 116623822 B CN116623822 B CN 116623822B
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- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 112
- 238000013016 damping Methods 0.000 title claims abstract description 94
- 230000001133 acceleration Effects 0.000 claims description 27
- 239000012528 membrane Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 230000007774 longterm Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
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- 238000005461 lubrication Methods 0.000 abstract description 6
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- 230000003068 static effect Effects 0.000 description 16
- 239000003921 oil Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
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Classifications
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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
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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
- E04H9/0235—Anti-seismic devices with hydraulic or pneumatic damping
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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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- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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- Buildings Adapted To Withstand Abnormal External Influences (AREA)
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Abstract
The invention relates to a spherical hydrostatic bearing tuning mass damping system, which relates to the technical field of structural vibration reduction and is arranged on a main structure (1) needing vibration control, and the system comprises a sliding plate friction pair (2), a sliding plate (3), a spherical hydrostatic bearing sliding support unit (4), a mass block (5), a damper (6), a frequency modulator (7), a limiting buffer (8) and a sensing monitor (9). Compared with the prior art, the invention has the advantages that the mass block is loaded and connected onto the spherical hydrostatic bearing sliding support unit, and the spherical hydrostatic bearing sliding support unit has almost no friction under the lubrication of the contact surface pressure film, so that the spherical hydrostatic bearing sliding support unit can be started even when the main structure is excited by external load to generate only slight vibration, thereby the invention can maximize the effect of improving the vibration comfort of the main structure, and simultaneously, the spherical hydrostatic bearing sliding support unit has almost no abrasion under the lubrication of the contact surface pressure film, so that the spherical hydrostatic bearing sliding support unit has almost no loss under the daily working condition.
Description
Technical Field
The invention relates to the technical field of structural vibration reduction, in particular to a spherical hydrostatic bearing tuned mass damping system.
Background
The mass tuning vibration damping technology is a relatively mature technology in the structural vibration control technology, can be directly and singly installed on a main structure due to low requirements on control elements, and is widely applied to vibration control of (super) high-rise buildings, high-rise structures and large-span structures. In the mass tuning type vibration damping products, a passive tuning mass damping system unit (Tuned Mass Damper, hereinafter referred to as TMD), a passive adjusting liquid damper (Tuned Liquid Damper, hereinafter referred to as TLD) and an active tuning mass damping system (Active Tuned Mass Damper, hereinafter referred to as ATMD) are the control devices with the highest frequency and the widest range in the current structure control field.
The TMD and TLD products have relatively simple structures, the working mechanism is that the fundamental frequency of the products is adjusted to be close to the control fundamental frequency required by a certain order of the main structure, when the main structure vibrates under the external load of strong wind, people's feet, earthquakes and the like, the products can passively resonate at the same frequency with the fundamental frequency of the order of the main structure by inertia, the resonance can inhibit the vibration of the main structure and consume energy through self damping, so that the vibration amplitude of the main structure is reduced. The passive mass tuning product has the characteristics of simple vibration control mechanism and no need of consuming extra energy during working.
When the TMD is used for reducing the horizontal vibration of the structure, the TMD can be divided into a suspended TMD and a bearing TMD according to the installation mode of the mass block.
The suspended TMD is suspended below a frame fixedly connected to the main structure by a cable-like member such as a wire rope or a wire rope. The motion form of the suspended TMD mass block is similar to a simple pendulum, and the motion period calculation formula is as followsL is the vertical distance between the fixed end of the inhaul cable and the mass center of mass, g is the earth gravity acceleration, but because the horizontal first-order self-vibration period of vibration control needed by (super) high-rise buildings, high-rise structures and large-span structures is often longer, the calculated swing length is larger, the first-order self-vibration period of the mansion in the sea is about 9 seconds, the swing length of the pendulum type eddy current tuning mass damping system is about 20 meters, the requirement on the use space is larger, and fewer structures reserve the space with the large space for TMD.
The mass blocks of the bearing TMD are borne by devices such as sliding plates, sliding rails, supporting seats and the like, and certain friction coefficients exist in the bearing devices. When the TMD mass block needs to generate an inertia inhibition effect asynchronous with the structure, the TMD mass block can be started only by overcoming the static friction force, and before the static friction force is overcome, the movement acceleration of the TMD mass block is the same as the structure. When TMD is used for improving structural comfort under wind load and the like and only generates working conditions with smaller amplitude, the absolute value of the acceleration of the structure is insufficient to enable the mass block to overcome static friction force to start, namely ma<Mu mg, wherein m is the weight of the mass, a is the structural vibration acceleration, mu is the friction coefficient, and g is the earth gravity acceleration. It can be seen that g.apprxeq.10 (m/s 2 ) When μ > 0.1×a, TMD cannot be started at this acceleration, and thus cannot be reducedVibration amplitude of the structure under acceleration. The static friction coefficient mu of common bearing devices such as sliding plates, sliding rails, supports and the like is difficult to be less than 0.01, so that the vibration control target a is less than or equal to 0.1 (m/s) 2 ) The structure of (2) is difficult to play a role in vibration reduction by using a TMD with a large friction bearing device.
Disclosure of Invention
The invention aims to provide a spherical hydrostatic bearing tuned mass damping system which meets at least one of the requirements of compact structure, starting sensitivity and TMD durability.
The spherical hydrostatic bearing tuning mass damping system provided by the invention is mainly technically characterized in that a mass block is borne and connected to a spherical hydrostatic bearing sliding support unit, and the spherical hydrostatic bearing sliding support unit has almost no friction under the lubrication of a contact surface pressure film, so that the spherical hydrostatic bearing sliding support unit can be started even when a main structure is excited by external load to generate only slight vibration, thereby maximally improving the vibration comfort of the main structure, and has almost no wear under the lubrication of the contact surface pressure film. The motion frequency of the spherical static pressure supporting tuned mass damping system is regulated to be close to the fundamental frequency controlled by the main structure, in the same-frequency resonance motion process of the mass block along with the main structure, the mass block absorbs the vibration of the main structure and performs inertial motion with a certain phase difference on the main structure to inhibit vibration reduction, in the motion process, the damping force generated by the damper and the limiting buffer and the friction force generated by the friction pair are equivalent to the system damping, and the kinetic energy of the structure is converted into heat energy through the system damping to be dissipated.
Compared with the existing similar products, the spherical hydrostatic bearing tuning mass damping system has the advantages that through the structural design of a compact product, the effects of high sensitivity and high durability and excellent structural comfort level are realized on the premise of occupying smaller field space, and the effects of limiting the movement amplitude of the mass block under sudden and extreme external load and simultaneously playing the tuning vibration reduction are realized through the multi-stage design.
The main structure of the invention is generally a high-rise building, a towering structure and a large-span structure.
The aim of the invention can be achieved by the following technical scheme:
the spherical hydrostatic bearing tuning mass damping system is arranged on a main structure which is required to be controlled by vibration, and plays a role in vibration reduction when the main structure vibrates under the excitation of external load; the system comprises:
the sliding plate friction pair is used for vertically bearing the upper sliding plate, and static friction force exists between the upper sliding plate and the sliding plate when the main structure does not vibrate greatly. When the main structure vibrates greatly, the sliding plate slides on the sliding plate friction pair, and a dynamic friction force exists between the sliding plate and the sliding plate friction pair;
the sliding plate is used for vertically bearing the upper spherical hydrostatic bearing sliding support unit, when the main structure vibrates slightly, the horizontal force transmitted by the spherical hydrostatic bearing sliding support unit is smaller than or equal to the static friction force between the sliding plate and the sliding plate friction pair, so that the bottom of the sliding plate does not slide, and when the main structure vibrates greatly, the horizontal force transmitted by the spherical hydrostatic bearing sliding support unit is larger than the static friction force between the sliding plate and the sliding plate friction pair, so that the sliding plate starts to slide, and at the moment, the dynamic friction force exists between the sliding plate and the sliding plate friction pair;
the spherical hydrostatic bearing sliding support unit is used for vertically bearing the upper mass block, the swinging period of the mass block during movement can be controlled by controlling the radian of the inner contact surface of the upper mass block, and a pressure film can be established between the inner contact surfaces of the spherical hydrostatic bearing sliding support unit, so that the inner contact surfaces have almost no friction during relative movement, and the starting performance and the durability of the product are improved;
the mass block is used for resonating with the main structure at the same frequency due to inertia when the main structure generates vibration under the external load when the product frequency is tuned to be close to the main structure, so that the vibration of the main structure is reduced due to the dynamic vibration absorption effect, and the mass block drives the damper and the limiting buffer to move in the moving process, so that the kinetic energy of the structure is converted into the heat energy of the damping unit for dissipation;
the damper is used for consuming kinetic energy of the mass block when the mass block shakes on the spherical static pressure supporting sliding support unit when the main structure vibrates in a small amplitude;
the frequency modulator is used for adjusting the shaking frequency of the mass block on the spherical hydrostatic bearing sliding support unit when the main structure vibrates in a small amplitude;
the limit buffer is used for consuming kinetic energy of the sliding plate when the sliding plate moves on the sliding plate friction pair when the main structure vibrates greatly;
the sensing monitor is used for monitoring the vibration condition of the main structure;
the sliding plate friction pair is borne on the main structure and fixedly connected with the main structure; the sliding plate is supported on the sliding plate friction pair and is in sliding connection with the sliding plate friction pair;
a spherical hydrostatic bearing sliding support unit is arranged between the sliding plate and the mass block;
the spherical hydrostatic bearing sliding support unit consists of a base, a top seat and an axle center arranged between the base and the top seat; the base is borne on the sliding plate and fixedly connected with the sliding plate; the top seat is used for bearing the mass block and is fixedly connected with the mass block; a bottom pressure film is arranged on one side of the base, facing the top base; an axle center top pressure film is arranged on one side of the top seat facing the base; the bottom pressure film and the top pressure film are provided with high-pressure oil by a controllable hydraulic component, are transmitted through a high-pressure oil supply pipeline and are formed between the axle center and an axle center bottom friction pair and between the axle center top friction pair;
one end of the damper is hinged with the bottom of the mass block, and the other end of the damper is hinged with the spherical hydrostatic bearing sliding support unit;
one end of the frequency modulator is hinged with the bottom of the mass block, and the other end of the frequency modulator is hinged with the spherical hydrostatic bearing sliding support unit; specifically, the frequency modulators can be symmetrically arranged at two sides of each damper, and can be arranged on the upper side, the lower side or the periphery of the damper according to actual conditions and space of projects;
the limit buffer is uniformly arranged on the main structure along the circumferential direction of the sliding plate friction pair;
the sensor monitor is arranged on the main structure.
Further, one end of the axle center close to the base is provided with an axle center bottom friction pair in sliding connection with the base, and one end close to the top seat is provided with an axle center top friction pair in sliding connection with the top seat.
In one embodiment of the invention, the base of the spherical hydrostatic bearing sliding support unit is borne on the sliding plate and fixedly connected with the sliding plate; the bottom pressure film and the top pressure film of the spherical hydrostatic bearing sliding support unit are provided with high-pressure oil by a controllable hydraulic component, are transmitted through a high-pressure oil supply pipeline and are formed between the axle center and the axle center bottom friction pair and between the axle center top friction pair; the axis bottom friction pair is directly borne on the base when the bottom pressure film is not built, and is borne on the base through the bottom pressure film after the bottom pressure film is built; the top seat is directly supported on the axle center top friction pair when the top pressure film is not established, and is supported on the axle center top friction pair through the top pressure film after the top pressure film is established.
In one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system is designed to move in two stages according to different motion amplitudes possibly occurring to the mass block under different external load working conditions, and the maximum motion amplitudes in the respective stages are respectively called a primary displacement value and a secondary displacement value.
In one embodiment of the present invention, the primary displacement value may be designed as an extreme value of displacement that may occur to the mass under the load condition that only affects comfort of the main structure, and the secondary displacement value may be designed as a difference between an extreme value of accumulated displacement that may occur to the mass under the load condition that the main structure is subjected to extreme load and the primary displacement value.
In one embodiment of the invention, the sensing monitor monitors the vibration acceleration of the main structure in real time, when the structure is subjected to external excitation vibration acceleration which is larger than a certain set threshold value, the controllable hydraulic component receives an opening command signal so as to establish a bottom pressure film and a top pressure film, and when the sensing monitor monitors that the vibration acceleration of the main structure is continuously smaller than the set threshold value within a certain set time length, the controllable hydraulic component receives a closing command signal so as to achieve the effects of energy conservation and noise reduction;
in one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system has the advantages that the vibration acceleration threshold of the main structure is determined according to the comfort limit value of the structure required to be controlled, and when the acceleration of the main structure is smaller than the threshold value, the structure comfort is in accordance with the design requirement, and vibration reduction control is not required to be additionally carried out.
In one embodiment of the invention, in the spherical hydrostatic bearing tuned mass damping system, when the controllable hydraulic assembly is closed, the bottom pressure film and the top pressure film are not established, the axis bottom friction pair is directly borne on the base, the top seat is directly borne on the axis top friction pair, the mass block does not drive the top seat to move relative to the base due to the fact that the static friction force is greater than the inertia force of the mass block under the current acceleration, and the static friction force generated by the sliding plate friction pair is also greater than the inertia force of the mass block under the current acceleration, the sliding plate does not move relative to the main structure, and at the moment, the spherical hydrostatic bearing tuned mass damping system does not work.
In one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system, when the controllable hydraulic assembly is closed, the bottom pressure membrane and the top pressure membrane are not established. If the main structure is suddenly subjected to external load such as sudden earthquake to generate larger amplitude vibration, the system can quickly control the opening of the controllable hydraulic component after the sensing monitor monitors the signal larger than the set threshold value, so that the pressure film and the top pressure film can be quickly established, but a relatively short-time axis bottom friction pair and an axis top friction pair can still generate sliding friction relative to the base and the top seat. The hidden danger is overcome by calculating the number of possible sudden earthquakes, accumulated action time and accumulated sliding travel and designing an axle center bottom friction pair and an axle center top friction pair which correspondingly meet the requirement of the abradable quantity.
In one embodiment of the invention, in the spherical hydrostatic bearing tuned mass damping system, when the controllable hydraulic assembly is started, the bottom pressure film and the top pressure film are established, and the mass block moves within the primary displacement value, the mass block drives the top seat and the friction pair at the top of the axle center to generate relative movement, and simultaneously the axle center drives the friction pair at the bottom of the axle center and the base to generate relative movement under the action of horizontal force. Due to the existence of the pressure film, the sliding surface has almost no abrasion and no friction under the lubrication of the full pressure film.
In one embodiment of the invention, when the mass moves within the first-order displacement value, the viscous damping effect of the bottom pressure film and the top pressure film is received in the movement process when the bottom pressure film and the top pressure film are established, and the sliding friction effect of the axis bottom friction pair and the axis top friction pair relative to the base and the top seat is generated in the movement process when the bottom pressure film and the top pressure film are not established, and the two friction pairs can be equivalently calculated as equivalent damping, and the effect of adjusting the overall damping ratio of a product can be achieved by increasing the number of the dampers or increasing the damping coefficient of the dampers.
In one embodiment of the invention, in the spherical hydrostatic bearing tuned mass damping system, when the mass moves within the primary displacement value, the movement period of the mass is mainly determined by the sum of spherical radians of the upper surface of the base and the lower surface of the top seat of the spherical hydrostatic bearing sliding support unit, and the effect of adjusting the whole movement period of a product can be achieved by increasing the number of frequency modulators or improving the rigidity of the frequency modulators.
In one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system enters a secondary displacement section when the movement amplitude of the mass block is larger than the primary displacement value and then moves continuously, and the mass block drives the sliding plate to slide relative to the main structure by driving the whole spherical hydrostatic bearing sliding support unit in the secondary displacement section.
In one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system receives friction force from a sliding plate friction pair, elastic resistance force of a limit buffer and damping force simultaneously when a mass moves within the secondary displacement value when the sliding plate slides. At the moment, the elastic rigidity of the limit buffer determines the movement period of the system, and the friction force of the friction pair and the resultant force of the damping force of the limit buffer determine the damping ratio of the system.
In one embodiment of the invention, the spherical hydrostatic bearing tuned mass damping system returns to the near-equilibrium position due to the elastic resistance of the limit bumper when the mass vibration amplitude is greater than the primary displacement value and returns to the primary displacement segment after entering the secondary displacement segment. The mass will return to the neutral position under the combined action of gravity and spring force after the main structure is no longer vibrating.
In one embodiment of the invention, the friction pair of the sliding plate is made of antifriction and wear-resistant materials with small friction coefficient and small wear index. Preferably, the friction pair of the sliding plate is made of polytetrafluoroethylene or copper alloy friction materials.
In one embodiment of the invention, the sliding plate is made of high-strength steel, and the bottom is provided with a smooth surface material with extremely small roughness and strong corrosion resistance of mirror surface stainless steel for reducing friction in the sliding process and keeping long-term stability; the periphery of the sliding plate is provided with a reinforcing stop block for transmitting the load in the horizontal direction, and the sliding plate can slide under the secondary displacement section through the driving of the mass block. Preferably, the material of the sliding plate is mirror surface stainless steel or bearing steel.
In one embodiment of the present invention, the mass is made of metal and/or concrete. In particular, the mass is made of metal or concrete or a combination of both. When the space is smaller in the field, the metal material with higher density can be preferentially adopted; when the space is wide in the field, concrete with lower cost can be preferentially adopted.
In one embodiment of the invention, the damper is an eddy current damper, an oil damper or a viscous damper.
In one embodiment of the invention, the frequency modulator is a coil spring or a rubber support.
In one embodiment of the invention, the limit bumper is an integrated bumper for providing rigidity and damping or is formed by connecting an elastic piece for providing rigidity and a damper for providing damping in parallel. Preferably, the elastic member is a spring.
In one embodiment of the present invention, the sensor monitor is a three-way acceleration sensor, and can monitor and feed back the three-way vibration acceleration of the structure.
In one embodiment of the invention, the spherical hydrostatic bearing sliding support unit adopts a friction pendulum support structure and cooperates with hydrostatic bearing to achieve an effect of almost no friction and no wear. The hydrostatic bearing is characterized in that a pressure film is generated between bearing and relatively moving contact surfaces by a hydraulic or pneumatic technology, so that the contact surfaces are separated from each other, and no solid is in direct contact, thereby achieving high-rigidity bearing through the pressure film and almost frictionless movement without solid friction. Preferably, the hydrostatic bearing is a hydrostatic bearing.
In one embodiment of the invention, friction pair materials are respectively arranged on the upper and lower axes of the spherical hydrostatic bearing sliding support unit, and even if the system encounters sudden external load such as sudden earthquake when the hydrostatic bearing pressure is not complete, the friction coefficient and the abrasion loss of the parts which move relatively are controllable in the whole movement process due to the existence of the friction pair materials, so that the problem of failure and damage can not exist.
In one embodiment of the present invention, in the spherical hydrostatic bearing sliding support unit, the axis bottom friction pair and the axis top friction pair are made of polytetrafluoroethylene friction plates or thrust bearings.
In one embodiment of the invention, the controllable hydraulic components of the spherical hydrostatic bearing saddle unit may remain normally open according to the actual situation in the field or may be controlled to switch according to real-time monitored data. The hydraulic pressure is supported, high pressure is provided, and therefore a pressure film between contact surfaces is formed, and the controllable hydraulic component is a component for providing the high pressure and mainly comprises a hydraulic oil source and a controllable hydraulic valve, wherein the controllable hydraulic valve can be controlled to be opened or closed according to monitoring data.
The spherical hydrostatic bearing tuning mass damping system has the comprehensive advantages of compact and reasonable structure, high space utilization rate, sensitive starting, strong durability, reasonable multi-stage displacement design and the like.
Compared with the existing similar products, the spherical hydrostatic bearing tuning mass damping system has the advantages that through the structural design of a compact product, the effects of high sensitivity and high durability and excellent structural comfort level improvement are realized on the premise of occupying smaller field space, the motion amplitude of a mass block can be limited under the limit external load through the multistage design, and meanwhile, the system still plays the role of tuning vibration reduction, and the system has the following specific advantages:
the spherical hydrostatic bearing tuned mass damping system provided by the invention has a compact overall structure, and can realize the horizontal vibration reduction requirement of a lower fundamental frequency structure in an environment with limited field use space;
the spherical hydrostatic bearing tuned mass damping system solves the problem that the starting performance of the bearing tuned mass damping system is limited due to friction force among internal components. The product of the invention is sensitive to start, and can meet the vibration control requirement of a main structure on micro amplitude;
thirdly, after the static pressure supporting pressure is established, the spherical static pressure supporting tuned mass damping system provided by the invention has the advantages that solid friction and abrasion do not exist between moving parts under the daily working condition, and the durability is good;
fourth, the spherical hydrostatic bearing tuning mass damping system provided by the invention considers the stability and reliability of sudden and sporadic non-hydrostatic oil film movement while designing the spherical hydrostatic bearing sliding support unit almost without abrasion and friction movement, and a pair of friction pair materials are additionally designed in the friction pendulum structure, so that the product durability is further ensured;
fifth, the spherical hydrostatic bearing tuned mass damping system provided by the invention is provided with an independent frequency modulator and a damper besides controlling the motion period of the radian of the friction pendulum in a one-stage displacement range, so that the adjustable requirement of a product can be met;
sixthly, according to the spherical hydrostatic bearing tuned mass damping system provided by the invention, through the design of multi-stage displacement values, different vibration control effects under multi-stage displacement can be realized, the motion amplitude of the mass block can be reliably limited under extreme external load, and meanwhile, the tuned vibration damping effect can be still exerted;
seventh, the tuned mass damping system of the spherical hydrostatic bearing provided by the invention is provided with the sensing monitor, can monitor the vibration condition of the structure in real time, and can automatically control the hydrostatic bearing according to the monitoring data, thereby having the function of active control;
eighth, the spherical hydrostatic bearing tuning mass damping system provided by the invention has the advantages that in the two-stage displacement range, the friction force, the elastic force and the damping force exert the limiting buffer function at the same time, and the controllable dimension is increased compared with the traditional limiting damper;
ninth, the spherical hydrostatic bearing tuning mass damping system provided by the invention has elastic force for returning the structure in a one-stage displacement range and a two-stage displacement range, so that the reliability and the practicability of the product are further improved.
Drawings
FIG. 1 is a schematic front view of a spherical hydrostatic bearing tuned mass damping system configuration in an embodiment;
FIG. 2 is a schematic top view of a spherical hydrostatic bearing tuned mass damping system configuration in an embodiment;
FIG. 3 is a partial schematic view of region I of FIG. 1;
FIG. 4 is a front view of a spherical hydrostatic bearing tuned mass damping system of an embodiment with a displacement value s 1;
FIG. 5 is a front view of a spherical hydrostatic bearing tuned mass damping system of an embodiment with a displacement value s1+s2;
FIG. 6 is a top view of a spherical hydrostatic bearing tuned mass damping system of an embodiment with a displacement value s 1;
FIG. 7 is a top view of a spherical hydrostatic bearing tuned mass damping system of an embodiment with a displacement value s1+s2;
FIG. 8 is a view of the area I of FIG. 1 when the hydrostatic bearing slide bearing unit pressure is not being established;
the reference numerals in the figures indicate: 1. a main structure; 2. a sliding plate friction pair; 3. a slide plate; 4. a spherical hydrostatic bearing sliding support unit; 4-1, a base; 4-2, bottom pressure membrane; 4-3, a friction pair at the bottom of the axle center; 4-4, an axle center; 4-5, an axle center top friction pair, 4-6 and an axle center top pressure film; 4-7, a top seat; 4-8, an oil return pipeline; 4-9, a controllable hydraulic component; 4-10, a high-pressure oil supply pipeline; 5. a mass block; 6. a damper; 7. a frequency modulator; 8. a limit buffer; 9. a sensor monitor.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Examples
Fig. 1, 2 and 3 show schematic structural diagrams of a spherical hydrostatic bearing tuned mass damping system in this embodiment.
In this embodiment, the spherical hydrostatic bearing tuning mass damping system is integrally installed above a main structure 1 to be controlled by vibration, and plays a role in damping when the main structure 1 vibrates under the excitation of external load, and is characterized in that the spherical hydrostatic bearing tuning mass damping system comprises a sliding plate friction pair 2, a sliding plate 3, a spherical hydrostatic bearing sliding support unit 4, a mass block 5, a damper 6, a frequency modulator 7, a limiting buffer 8 and a sensing monitor 9;
in the embodiment, the spherical hydrostatic bearing sliding support unit 4 comprises a base 4-1, a bottom pressure membrane 4-2, an axle center bottom friction pair 4-3, an axle center 4-4, an axle center top friction pair 4-5, an axle center top pressure membrane 4-6, a top seat 4-7, an oil return pipeline 4-8, a controllable hydraulic component 4-9 and a high-pressure oil supply pipeline 4-10;
in this embodiment, the sliding plate friction pair 2 is supported on the main structure 1 and is fixedly connected with the main structure 1; the sliding plate 3 is borne on the sliding plate friction pair 2; the spherical hydrostatic bearing sliding support units 4 can be arranged in a plurality, and are borne on the sliding plate 3 through the respective bases 4-1 and fixedly connected with the sliding plate; the mass block 5 is borne on the top seat 4-7 of the spherical hydrostatic bearing sliding support unit 4 and is fixedly connected with the top seat; one end of the damper 6 is hinged to the bottom of the mass block 5, and the other end is hinged to the base 4-1 of the spherical hydrostatic bearing sliding support unit 4; the mass block 5 is borne on the top seat 4-7 of the spherical hydrostatic bearing sliding support unit 4 and is fixedly connected with the top seat; one end of the frequency modulator 7 is hinged to the bottom of the mass block 5, and the other end of the frequency modulator is hinged to the base 4-1 of the spherical hydrostatic bearing sliding support unit 4; the limit buffer 8 is fixedly connected to the upper part of the main structure 1; the sensor monitor 9 is connected to the main structure 1;
in this embodiment, the base 4-1 of the spherical hydrostatic bearing sliding support unit 4 is carried on the sliding plate 3 and is fixedly connected with the sliding plate 3; the bottom pressure film 4-2 and the top pressure film 4-6 of the spherical hydrostatic bearing sliding support unit 4 are provided with high-pressure oil by a controllable hydraulic component 4-9, are transmitted through a high-pressure oil supply pipeline 4-10 and are formed between the axle center 4-4 and an axle center bottom friction pair 4-3 and an axle center top friction pair 4-5; the axis bottom friction pair 4-3 is directly borne on the base 4-1 when the bottom pressure film 4-2 is not built, and is borne on the base 4-1 through the bottom pressure film 4-2 after the bottom pressure film 4-2 is built; the top seat 4-7 is directly supported on the axle center top friction pair 4-5 when the top pressure film 4-6 is not established, and is supported on the axle center top friction pair 4-5 through the top pressure film 4-6 after the top pressure film 4-6 is established.
Referring to fig. 1-8 in detail, in this embodiment, the tuned mass damping system for hydrostatic bearing of a spherical surface is designed to move in two stages according to different possible movement amplitudes of the mass 5 under different external load conditions, and the maximum movement amplitudes in the respective stages are respectively referred to as a primary displacement value s1 and a secondary displacement value s2.
The movement limit amplitude of the mass block 5 under the daily working condition of the spherical static pressure supporting tuned mass damping system is called a primary displacement value s1, and the primary displacement value s1 can be designed as a displacement extreme value which can happen to the mass block 5 under the external load working condition that the main structure 1 is only affected in comfort. During the reciprocating motion of the first displacement section, the motion period of the mass block 5 is mainly determined by the spherical radian of the spherical hydrostatic bearing sliding support unit 4, and the motion form is similar to the single pendulum motion, and is also subjected to the elastic resistance provided by the frequency modulator 7 and the damping force provided by the damper 6. When the main structure 1 is subjected to external load affecting the structural safety to generate large vibration, the motion amplitude of the mass block 5 is larger than the primary displacement value s1 and enters the secondary displacement section. In the secondary displacement section, the mass block 5 drives the sliding plate 3 to slide by driving the whole spherical hydrostatic bearing sliding support unit 4, and the sliding plate 3 receives friction force from a friction pair, elastic resistance and damping force of the limiting buffer 8 at the same time when sliding. The secondary displacement value s2 may be designed as a difference between an accumulated displacement extremum that may occur in the mass 5 under the extreme load condition of the main structure 1 and the primary displacement value s1, where the accumulated displacement extremum that may occur in the mass 5 is denoted as s total.
In this embodiment, the primary displacement value s1 may be designed as an extreme value of displacement that may occur in the mass 5 under the load condition that only the comfort is affected on the main structure 1, and the secondary displacement value s2 may be designed as a total-s 1 of the difference between the extreme value of accumulated displacement that may occur in the mass 5 under the load condition that the main structure 1 is subjected to the extreme load and the primary displacement value.
In this embodiment, the sensing monitor 9 monitors the vibration acceleration of the main structure 1 in real time, when the structure is subjected to external load excitation, the controllable hydraulic component 4-9 receives an opening command signal when the vibration acceleration is greater than a certain set threshold value, so as to establish a bottom pressure membrane 4-2 and a top pressure membrane 4-6, and when the sensing monitor 9 monitors that the vibration acceleration of the main structure 1 is continuously less than the set threshold value within a certain set time period, the controllable hydraulic component 4-9 receives a closing command signal, so as to achieve the effects of energy saving and noise reduction;
in this embodiment, in the tuned mass damping system of the spherical hydrostatic bearing, the vibration acceleration threshold of the main structure 1 is determined according to the comfort limit value of the control required by the structure, and when the acceleration of the main structure 1 is smaller than the threshold value, the structural comfort is in accordance with the design requirement, and vibration damping control is not required additionally.
In this embodiment, in the spherical hydrostatic bearing tuned mass damping system, when the controllable hydraulic assembly 4-9 is closed, the bottom pressure film 4-2 and the top pressure film 4-6 are not established, the axis bottom friction pair 4-3 is directly supported on the base 4-1, the top seat 4-7 is directly supported on the axis top friction pair 4-5, the static friction force is larger than the inertia force of the mass block 5 under the current acceleration, the mass block 5 does not drive the top seat 4-7 to move relative to the base 4-1, and the static friction force generated by the slide friction pair 2 is also larger than the inertia force of the mass block 5 under the current acceleration, so that the slide plate 3 does not move relative to the main structure 1.
In this embodiment, the spherical hydrostatic bearing tuned mass damping system is such that the bottom pressure membrane 4-2 and the top pressure membrane 4-6 are not established when the controllable hydraulic assembly 4-9 is closed. If the main structure 1 is suddenly subjected to external load such as sudden earthquake and the like to generate larger amplitude vibration, the system can quickly control the controllable hydraulic component 4-9 to be started after the sensor monitor 9 monitors the signal larger than the set threshold value, so that the pressure membrane 4-2 and the top pressure membrane 4-6 can be quickly established, but the axle center bottom friction pair 4-3 and the axle center top friction pair 4-5 still can generate sliding friction relative to the base 4-1 and the top seat 4-7 in a shorter time. The hidden danger is overcome by calculating the number of possible sudden earthquakes, accumulated action time and accumulated sliding travel and designing the axial bottom friction pair 4-3 and the axial top friction pair 4-5 which correspondingly meet the requirement of the abradable quantity.
In this embodiment, in the tuned mass damping system with spherical hydrostatic bearing, when the controllable hydraulic assembly 4-9 is opened and the bottom pressure membrane 4-2 and the top pressure membrane 4-6 are established, the mass 5 moves within the primary displacement value s1, the mass 5 drives the top seat 4-7 and the axis top friction pair 4-5 to generate relative movement, and simultaneously the axis 4-4 drives the axis bottom friction pair 4-3 and the base 4-1 to generate relative movement under the action of horizontal force. Due to the existence of the pressure film, the sliding surface has almost no abrasion and no friction under the lubrication of the full pressure film.
In this embodiment, when the mass block 5 moves within the first-stage displacement value s1, the bottom pressure film 4-2 and the top pressure film 4-6 are subjected to viscous damping action of the bottom pressure film 4-2 and the top pressure film 4-6 during movement, and when the bottom pressure film 4-2 and the top pressure film 4-6 are not established, the bottom friction pair 4-3 and the top friction pair 4-5 generate sliding friction action relative to the base 4-1 and the top seat 4-7 during movement, and both can be equivalently calculated as equivalent damping, and the effect of adjusting the overall damping ratio of the product can be achieved by increasing the number of dampers 6 or increasing the damping coefficient of the dampers 6.
In this embodiment, in the tuned mass damping system with spherical hydrostatic bearing, when the mass block 5 moves within the first-stage displacement value s1, the movement period of the mass block 5 is mainly determined by the sum of spherical radians of the upper surface of the base 4-1 and the lower surface of the top seat 4-7 of the sliding support unit 4 with spherical hydrostatic bearing, and the effect of adjusting the overall movement period of the product can be achieved by increasing the number of frequency modulators 7 or improving the rigidity of the frequency modulators 7.
In this embodiment, in the tuned mass damping system of the spherical hydrostatic bearing, when the movement amplitude of the mass 5 is greater than the primary displacement value s1 and then continues to move, the tuned mass damping system enters a secondary displacement section, and in the secondary displacement section, the mass 5 drives the sliding plate 3 to slide relative to the main structure 1 by driving the whole spherical hydrostatic bearing sliding support unit 4.
In this embodiment, in the tuned mass damping system with spherical hydrostatic bearing, when the mass 5 moves within the second displacement value s2, the sliding plate 3 receives the friction force from the sliding plate friction pair 2, the elastic resistance and the damping force of the limit buffer 8 at the same time when sliding. At this time, the elastic rigidity of the limit buffer 8 determines the movement period of the system, and the friction force of the sliding plate friction pair 2 and the resultant force of the damping forces of the limit buffer 8 determine the damping ratio of the system.
In this embodiment, in the tuned mass damping system with a spherical hydrostatic bearing, when the vibration amplitude of the mass 5 is greater than the primary displacement value s1, and returns to the primary displacement section again after entering the secondary displacement section, the sliding plate 3 returns to the near-equilibrium position due to the elastic resistance of the limiting buffer 8. The mass 5 will return to the neutral position again under the combined action of gravity and spring force after the main structure 1 is no longer vibrating.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. The spherical hydrostatic bearing tuned mass damping system is arranged on a main structure (1) for vibration control, and is characterized by comprising a sliding plate friction pair (2), a sliding plate (3), a spherical hydrostatic bearing sliding support unit (4), a mass block (5), a damper (6), a frequency modulator (7), a limit buffer (8) and a sensing monitor (9);
the sliding plate friction pair (2) is supported on the main structure (1) and is fixedly connected with the main structure; the sliding plate (3) is borne on the sliding plate friction pair (2) and is in sliding connection with the sliding plate friction pair (2);
a spherical hydrostatic bearing sliding support unit (4) is arranged between the sliding plate (3) and the mass block (5);
the spherical hydrostatic bearing sliding support unit (4) consists of a base (4-1), a top seat (4-7) and an axle center (4-4) arranged between the base and the top seat; the base (4-1) is borne on the sliding plate (3) and fixedly connected with the sliding plate; the top seat (4-7) is used for bearing the mass block (5) and is fixedly connected with the mass block; the base (4-1) is provided with a bottom pressure film (4-2) towards one side of the top seat (4-7); an axle center top pressure film (4-6) is arranged on one side of the top seat (4-7) facing the base seat (4-1);
one end of the damper (6) is hinged with the bottom of the mass block (5), and the other end of the damper is hinged with the spherical hydrostatic bearing sliding support unit (4);
one end of the frequency modulator (7) is hinged with the bottom of the mass block (5), and the other end of the frequency modulator is hinged with the spherical hydrostatic bearing sliding support unit (4);
the limit buffer (8) is uniformly arranged on the main structure (1) along the circumferential direction of the sliding plate friction pair (2);
the sensing monitor (9) is arranged on the main structure (1);
an axle center bottom friction pair (4-3) which is in sliding connection with the base (4-1) is arranged at one end of the axle center (4-4) close to the base (4-1), and an axle center top friction pair (4-5) which is in sliding connection with the top seat (4-7) is arranged at one end of the axle center (4-7) close to the top seat;
the spherical hydrostatic bearing sliding support unit (4) further comprises an oil return pipeline (4-8), a controllable hydraulic component (4-9) and a high-pressure oil supply pipeline (4-10);
the bottom pressure membrane (4-2) and the top pressure membrane (4-6) of the spherical hydrostatic bearing sliding support unit (4) are provided with high-pressure oil by a controllable hydraulic component (4-9) and are transmitted through a high-pressure oil supply pipeline (4-10) and are formed between the axle center (4-4) and an axle center bottom friction pair (4-3) and an axle center top friction pair (4-5); the axis bottom friction pair (4-3) is directly borne on the base (4-1) when the bottom pressure film (4-2) is not built, and is borne on the base (4-1) through the bottom pressure film (4-2) after the bottom pressure film (4-2) is built; the top seat (4-7) is directly supported on the axle center top friction pair (4-5) when the top pressure film (4-6) is not established, and is supported on the axle center top friction pair (4-5) through the top pressure film (4-6) after the top pressure film (4-6) is established;
the sensing monitor (9) monitors the vibration acceleration of the main structure (1) in real time, when the structure is subjected to external excitation vibration acceleration to be larger than a certain set threshold value, the controllable hydraulic component (4-9) can receive an opening command signal, so that a bottom pressure membrane (4-2) and a top pressure membrane (4-6) are established, and when the sensing monitor (9) monitors that the vibration acceleration of the main structure (1) is continuously smaller than the set threshold value within a certain set time length, the controllable hydraulic component (4-9) can receive a closing command signal.
2. The spherical hydrostatic bearing tuned mass damping system according to claim 1, wherein the material of the slide friction pair (2) is an antifriction and wear-resistant material with a small friction coefficient and a small wear index.
3. A spherical hydrostatic bearing tuned mass damping system according to claim 1, characterized in that the slide (3) is made of high strength steel, the bottom is provided with a smooth surface material of the mirror stainless steel type with minimal roughness and high corrosion resistance for reducing friction during sliding and maintaining its long-term stability.
4. The tuned mass damping system of the hydrostatic bearing of claim 1, wherein the slide plate (3) is provided with reinforcing stops around to transfer horizontal loads.
5. A spherical hydrostatic bearing tuned mass damping system according to claim 1, wherein the mass (5) is made of metal and/or concrete.
6. A spherical hydrostatic bearing tuned mass damping system according to claim 1, wherein the damper (6) is an eddy current damper, an oil damper or a viscous damper.
7. A spherical hydrostatic bearing tuned mass damping system according to claim 1, wherein the frequency modulator (7) is a coil spring or a rubber mount.
8. A tuned mass damping system for spherical hydrostatic bearing according to claim 1, wherein the limit damper (8) is an integrated damper providing stiffness and damping or is composed of an elastic member providing stiffness and a damper providing damping in parallel.
9. A spherical hydrostatic bearing tuned mass damping system according to claim 1, wherein the sensor monitor (9) is a three-way acceleration sensor.
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| CN202310918988.9A CN116623822B (en) | 2023-07-26 | 2023-07-26 | Tuned mass damping system for spherical hydrostatic bearing |
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| CN116623822A (en) | 2023-08-22 |
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