CN110500375B - TLMD vibration reduction system - Google Patents
TLMD vibration reduction system Download PDFInfo
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- CN110500375B CN110500375B CN201910802590.2A CN201910802590A CN110500375B CN 110500375 B CN110500375 B CN 110500375B CN 201910802590 A CN201910802590 A CN 201910802590A CN 110500375 B CN110500375 B CN 110500375B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/002—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising at least one fluid spring
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Abstract
The invention discloses a TLMD vibration reduction system, which comprises a TLD and a plurality of TMDs, wherein each TMD comprises a mass block, a first spring, a second spring, a third spring and liquid, the TLD also comprises liquid and a liquid storage tank, and the operation steps are as follows: before selecting parameters of each part of TMD, firstly measuring the main frequency of a required damping structure and external excitation frequency spectrum characteristics, then determining the modal mass ratio of the TMD to the main structure according to damping requirements, wherein the selection range is between 1% and 5%; and designing the length of the TMD swing rod and the spring stiffness according to the vibration damping frequency range determined by the S1 and the corresponding mass value, wherein the TMD is symmetrically arranged relative to the main body structure. According to the invention, the vibration frequency of the TMD mass blocks can be adjusted according to external excitation, so that broadband vibration reduction is realized, and the TLD liquid is used as damping liquid of the TMD and vibrates per se, so that vibration reduction is realized by the collision of shaking and the wall of the liquid storage tank.
Description
Technical Field
The invention relates to the technical field of TLMD vibration reduction structures, in particular to a TLMD vibration reduction system.
Background
In order to cope with global climate change and reduce greenhouse gas emission, China promulgates and implements ' renewable energy law of the people's republic of China ' in 2006 and 1 month, encourages the development of clean energy and organizes and plans the construction work of wind power plants in China. Over the past decade, wind power bases have evolved dramatically and have been extended from land to the sea. Compared with inland wind power, offshore wind power has the advantages of high wind speed, low wind shear, low turbulence, high yield and the like. China has abundant offshore wind resources and huge wind power development potential, and has important practical significance for developing offshore wind resources.
However, the offshore wind power generation structure is complex in stress, and the offshore wind power generation structure bears repeated excitation effects of waves, tide, wind load and the like for a long time in a design service life, so that the structures such as a tower barrel and the like are easy to fatigue and break, the maintenance cost is increased, and the service life of the generator set is shortened. Vibration damping is particularly important for wind power generation structures, particularly offshore wind power generation towers.
A Tuned Mass Damper (TMD) is a passive vibration damper used in an earlier structural system, mainly comprises three parts, namely a mass, a damper and a spring, and generally can generate a good vibration damping effect only when the natural frequency of the TMD is the same as or close to the excitation frequency.
Tuned Liquid Dampers (TLDs) were first applied to satellites and submarines, mainly to suppress the flutter of satellites and stabilize the sloshing of submarines, and were applied in civil engineering structural design in the past 80 s. In general TLD fluids are less damped and when the excitation frequency is the same as the fluid frequency, the fluid enters the resonant frequency region where the fluid cannot provide steady state amplitude and phase difference damping forces due to spinning and whirling. In the design process, in order to avoid the frequency band and exert the TLD vibration damping effect as much as possible, the liquid sloshing damping value needs to be increased.
Disclosure of Invention
The invention aims to solve the defects in the prior art, such as: when the excitation frequency is the same as the liquid frequency, the liquid enters a resonant frequency section, and at the moment, the liquid cannot provide damping force with steady amplitude and phase difference due to rotation and vortex motion, so that the TLMD damping system is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a TLMD vibration damping system comprises a TLD and a plurality of TMDs, wherein the TMDs comprise mass blocks, first springs, second springs, liquid and swing rods, adjacent mass blocks are connected through the second springs, the mass blocks are connected with the inner side walls of a liquid storage tank through the first springs, the upper portions of the mass blocks are connected with the swing rods, or the TMDs comprise mass blocks, first springs, second springs, third springs and liquid, the adjacent mass blocks are connected through the second springs, the mass blocks are connected with the inner side walls of the liquid storage tank through the first springs, each mass block is connected with the bottom of the liquid storage tank through the third springs, the TLD also comprises the liquid and the liquid storage tank, and the mass blocks, the first springs, the second springs and the third springs of the TMDs are all soaked in the TLD liquid, and the operation steps are as follows:
s1: before selecting parameters of each part of TMD, firstly measuring the main frequency of a required damping structure and external excitation frequency spectrum characteristics, then determining the modal mass ratio of the TMD to the main structure according to damping requirements, wherein the selection range is between 1% and 5%;
s2: designing the length and the spring stiffness of a swinging rod of the TMD according to the vibration damping frequency range and the corresponding mass value determined by S1, when the TMD comprises a mass block, a first spring, a second spring, liquid and the swinging rod, wherein the TMD is symmetrically arranged relative to a main body structure, and when the TMD comprises the mass block, the first spring, the second spring, a third spring and the liquid, the spring stiffness of the TMD is designed, and the TMD is symmetrically arranged relative to the main body structure;
s3: the TLD is designed by adopting a fluid fluctuation function; the outer diameter of the liquid storage tank is determined according to the diameter of the main structure, and the inner diameter of the liquid storage tank is determined by considering the arrangement requirements of the passing and other pipelines; the liquid level height is determined by the vibration reduction frequency; the damping magnitude during the mixed motion of the liquid, the mass block and the spring can be determined through simplified tests; the inclination angle of the bottom plate of the liquid storage tank can be determined by integrating the liquid and the inner and outer diameters of the liquid storage tank, and is selected between 30 degrees and 60 degrees.
Preferably, the TMD comprises a mass block, a first spring, a second spring, liquid and a swing rod, and the TMD tuned simple pendulum frequency is of the formula
And formula
Determining in a combined manner, wherein L is the length of the swing rod (2), Σ K is the equivalent total stiffness, M is the mass of the mass block (1), the length of the swing rod is determined by the TMD, the TMD comprises the mass block, a first spring, a second spring, a third spring and liquid, and the TMD tuning frequency is a free formula
And determining, wherein Σ K is the equivalent total stiffness, and M is the mass of the mass block.
Preferably, the number and the frequency value of the mass blocks of the TMD are selected according to the structure and the vibration reduction requirement, the liquid level height of the TLD is determined according to the vibration reduction frequency required, the damping value of the TLD selects liquid with different viscosities according to the damping value required by TMD frequency modulation, and the bottom plate of the liquid storage tank of the TLD is obliquely arranged.
Compared with the prior art, the invention has the beneficial effects that:
1. the vibration frequency of the TMD mass blocks can be adjusted according to external excitation, and broadband vibration reduction is achieved.
2. TLD liquid is on the one hand as the damping fluid of TMD, and self takes place the vibration simultaneously, realizes the damping through rocking the collision with the liquid storage tank wall.
3. The mass immersed in the liquid and the springs connecting the mass increase the damping value of the liquid itself, thereby enhancing the damping capacity of the TLD.
4. The TMD mass block is connected with the main body structure through the spring, the collision force of the TMD and the main body structure can be reduced, meanwhile, the TMD mass block is separated from the cylinder wall of the liquid storage tank, energy dissipation can be achieved through collision of the TMD mass block and the cylinder wall of the liquid storage tank in the vibration process, and vibration of the main body structure is reduced.
5. The mass block in the TLMD can vibrate in multiple directions, and multi-dimensional vibration reduction control is realized.
6. The springs and mass surfaces used in the TLMD of the present invention may be roughened or otherwise treated to increase the damping force upon contact with liquid.
7. According to the TLMD liquid storage tank, the bottom plate is obliquely arranged, so that the quality of shaking liquid can be improved.
8. The TLMD mass block and the side wall of the liquid storage tank can dissipate energy through collision.
Drawings
FIG. 1 is a schematic plan view of a TLMD vibration damping system according to the present invention;
FIG. 2 is a schematic view of a mass surface roughening treatment structure for a TLMD in a TLMD damping system according to the present invention;
FIG. 3 is a method of connecting the mass block to the body structure of a TLMD damping system in accordance with the present invention;
FIG. 4 illustrates another method of attaching the mass block to the body structure of a TLMD damping system in accordance with the present invention.
In the figure: 1 mass block, 2 swing rods, 3 first springs, 4 second springs, 5 liquid, 6 liquid storage tanks and 7 third springs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
referring to fig. 1-4, a TLMD vibration damping system includes a TLD and a plurality of TMDs, each TMD includes a mass block 1, a swing rod 2, a first spring 3, a second spring 4, and a liquid 5, adjacent mass blocks 1 are connected through the second springs 4, the mass blocks 1 are connected with the inner side wall of a liquid storage tank 6 through the first springs 3, and the TLD also includes the liquid 5 and the liquid storage tank 6.
The mass block type liquid crystal display device is provided with a plurality of Tuned Mass Dampers (TMD), the swing rod 2 is connected with a main body structure through a universal hinge to ensure that the mass block 1 can swing along all directions, the liquid storage tank 6 is welded on two side walls of the main body structure, and the mass block 1, the first spring 3 and the second spring 4 of the TMD are all soaked in TLD liquid 5.
Integral TMD tuning simple pendulum frequency passing type
And formula
Calculating in a combined manner, wherein L is the length of the oscillating rod 2, Σ K is the equivalent total stiffness, M is the mass of the mass block 1, the number and frequency values of the TMD mass blocks 1 can be selected according to specific structures and vibration reduction requirements, the TMD frequencies in the mass blocks 1 can be the same or different, tuning is realized by changing the stiffness of the mass blocks 1 and the spring, and the TLD liquid level height is determined according to the vibration reduction frequency requiredAnd meanwhile, the mass ratio of the shaking liquid 5 to the total liquid 5 can be increased, the TMD mass block 1 and the spring are soaked in the TLD liquid 5, the soaking depth is determined according to the TMD possible displacement value, and the flowing resistance of the TLD liquid 5 is increased by the TMD mass block 1 and the spring, so that the self vibration damping performance of the TLD is improved.
Before selecting the parameters of each part of TMD, the main frequency of the needed damping structure and the external excitation frequency spectrum characteristics are firstly measured. Determining the modal mass ratio of the TMD to the main body structure (including various devices) according to the vibration reduction requirement, generally selecting about 1-5%, and designing the length of the TMD swing rod 2 and the spring stiffness according to the vibration reduction frequency range determined in the first step and the corresponding mass value. Different values of the parameters can be chosen for different TMDs, but in order to avoid a large adverse effect on the host structure, it is proposed that the TMDs are symmetrically arranged with respect to the host structure, and the TLD design can be designed using a fluid fluctuation function or Housner simplified equation.
The outer diameter of the liquid storage box 6 is determined according to the diameter of the main structure, and the inner diameter is determined by considering the passing and the arrangement requirements of other pipelines. The liquid level is determined by the damping frequency. The amount of damping in the combined motion of the liquid 5 with the mass 1 and the spring can be determined by simplified experiments. The inclination angle of the bottom plate of the liquid storage tank 6 can be determined by integrating the inner diameter and the outer diameter of the liquid 5 and the liquid storage tank 6, and is recommended to be selected between 30 degrees and 60 degrees, and can also be determined by simplifying experiments.
Example two:
referring to fig. 1-4, a TLMD damping system includes a TLD and a plurality of TMDs, the TMDs include masses 1, first springs 3, second springs 4, third springs 7 and liquid 5, adjacent masses 1 are connected through second springs 4, masses 1 are connected through first springs 3 with the inside wall of liquid storage tank 6, the TLD also includes liquid 5 and liquid storage tank 6.
According to the invention, a plurality of Tuned Mass Dampers (TMD) are arranged, the mass block 1 is connected with the bottom of the liquid storage tank 6 through the third spring 7, so that the mass block 1 can swing along all directions, the liquid storage tank 6 is welded on two side walls of the main structure, and the mass block 1, the first spring 3, the second spring 4 and the third spring 7 of the TMD are all soaked in the TLD liquid 5.
Integral TMD tuning frequency pass-through
Calculating that Σ K is the equivalent total stiffness, M is the mass of the mass block 1, the number and frequency values of the TMD mass blocks 1 can be selected according to the specific structure and the vibration reduction requirement, the frequency of each mass block 1TMD can be the same or different, tuning is realized by changing the stiffness of the mass block 1 and the spring, the TLD liquid level height is determined according to the required vibration reduction frequency, a Housner approximate calculation method can be adopted for design, the TLD damping value selects different viscosity liquids 5 according to the damping value required by TMD frequency modulation, the bottom plate of the TLD liquid storage tank 6 is obliquely arranged, the mass ratio of the shaking liquid 5 to the total liquid 5 can be increased, the TMD mass block 1 and the spring are both soaked in the TLD liquid 5, and the soaking depth is determined according to the possible displacement value of the TMD.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A TLMD vibration damping system comprises a TLD and a plurality of TMDs, and is characterized in that each TMD comprises a mass block (1), a first spring (3), a second spring (4), liquid (5) and a swing rod (2), adjacent mass blocks (1) are connected through the second springs (4), the mass blocks (1) are connected with the inner side wall of a liquid storage tank (6) through the first springs (3), the upper parts of the mass blocks (1) are connected with the swing rods (2), or each TMD comprises a mass block (1), a first spring (3), a second spring (4), a third spring (7) and liquid (5), adjacent mass blocks (1) are connected through the second springs (4), the inner side walls of the mass blocks (1) and the liquid storage tank (6) are connected through the first springs (3), and the bottom of each mass block (1) is connected with the bottom of the liquid storage tank (6) through the third springs (7), the TLD also comprises liquid (5) and a liquid storage tank (6), the mass block (1), the first spring (3), the second spring (4) and the third spring (7) of the TMD are all soaked in the TLD liquid (5), and the operation steps are as follows:
s1: before selecting parameters of each part of TMD, firstly measuring the main frequency of a required damping structure and external excitation frequency spectrum characteristics, then determining the modal mass ratio of the TMD to a main body structure (including various devices) according to damping requirements, wherein the selection range is between 1% and 5%;
s2: according to the vibration reduction frequency range and the corresponding mass value determined by S1, when the TMD comprises a mass block (1), a first spring (3), a second spring (4), a liquid (5) and a swing rod (2), designing the length of the swing rod (2) of the TMD and the spring stiffness, wherein the TMD is symmetrically arranged relative to the main body structure, when the TMD comprises the mass block (1), the first spring (3), the second spring (4), a third spring (7) and the liquid (5), designing the spring stiffness of the TMD, and wherein the TMD is symmetrically arranged relative to the main body structure;
s3: the TLD is designed by adopting a fluid fluctuation function; the outer diameter of the liquid storage tank (6) is determined according to the diameter of the main structure, and the inner diameter is determined by considering the passing and the arrangement requirements of other pipelines; the liquid level height is determined by the vibration reduction frequency; the damping size of the mixed motion of the liquid (5), the mass block (1) and the spring can be determined by simplified tests; the inclination angle of the bottom plate of the liquid storage tank (6) can be determined by integrating the liquid (5) and the inner and outer diameters of the liquid storage tank (6), and is selected between 30 degrees and 60 degrees.
2. A TLMD damping system according to claim 1, characterized in that when said TMD comprises a mass (1), a first spring (3), a second spring (4), a liquid (5) and a pendulum rod (2), said TMD tuned simple pendulum frequency is of the formula
And formula
Determining in combination, wherein L is the length of the pendulum rod (2), Σ K is an equivalent total stiffness, M is the mass of the mass block (1), and when the TMD comprises the mass block (1), the first spring (3), the second spring (4), the third spring (7) and the liquid (5), the TMD tuning frequency is represented by formula
Determining, wherein Σ K is the equivalent total stiffness and M is the mass of the mass (1).
3. A TLMD damping system according to claim 1 or 2, characterized in that the number and frequency values of the masses (1) of the TMD are selected according to structural and damping requirements, the TLD liquid level is determined according to the required damping frequency, the TLD damping value is selected according to the damping value required by TMD frequency modulation, the TLD liquid (5) of different viscosity is selected, and the bottom plate of the reservoir (6) of the TLD is arranged obliquely.
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| CN107419816A (en) * | 2017-08-16 | 2017-12-01 | 山东大学 | Control the vibration absorber of three-dimensional translating and its torsional direction |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |