CN112582962A - Damper and method for determining medium quality of damping fluid in damper - Google Patents
Damper and method for determining medium quality of damping fluid in damper Download PDFInfo
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- CN112582962A CN112582962A CN201910926083.XA CN201910926083A CN112582962A CN 112582962 A CN112582962 A CN 112582962A CN 201910926083 A CN201910926083 A CN 201910926083A CN 112582962 A CN112582962 A CN 112582962A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/14—Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound
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Abstract
The invention provides an anti-vibration hammer and a method for determining the quality of a damping fluid medium in the anti-vibration hammer, wherein the anti-vibration hammer comprises damping parts which are vertically and transversely arranged, and the transversely arranged damping parts are composed of damping parts which are symmetrically arranged on the same horizontal plane; the vertical damping piece and the transverse damping piece are vertically connected, and the connection point of the vertical damping piece and the transverse damping piece is located at the midpoint of the transverse damping piece. This damper has three kinds of power consumption structures: namely a hemispherical damping part containing a damping liquid medium, a steel strand structure depending on friction energy consumption between strands and a vertical damping part with hysteretic energy consumption capability. The three sets of energy consumption systems all consume and dissipate vertical wind vibration energy, so that the two sets of energy consumption systems disclosed by the invention can effectively reduce vertical wind vibration of a large span wire in a span.
Description
Technical Field
The invention relates to the technical field of power grid disaster prevention, in particular to a damper and a method for determining the medium quality of damping fluid in the damper.
Background
Under the action of continuous stable wind, the connection part of the lead and the damper is easy to wear and even break, and the safe operation of the line is seriously threatened. In addition, the damper has the effect of reducing the vibration of the power transmission conductor only at several natural frequencies, and the effect of the damper on reducing wind vibration is obviously reduced beyond the several frequency points. Furthermore, the existing damper basically only depends on the friction of the steel strands to dissipate wind energy, so that the damping coefficient of the damper is low. The long-term micro-vibration and dead weight pressure of the damping device can make the device slowly generate large plastic deformation, which can cause the unstable performance of the damping device.
In order to reduce the damage of the aluminum alloy stranded wire caused by the breeze vibration to the transmission conductor, a vibration damping device is urgently needed, and the material selection of the device is also important because the vibration damping device needs to be exposed to weather such as wind, frost, snow and rain.
Disclosure of Invention
The invention provides a novel damping damper which has a high damping coefficient, reduces the frequency band of vertical wind vibration of a wire to be wide, can reduce the abrasion degree of the damper on a transmission wire, can prevent equipment from deforming, and ensures the operation safety of a power grid.
Aiming at the defects of the prior art, the application designs the damper and a method for determining the medium quality of the damping fluid in the damper; the damper consists of a steel strand, a hammer head and a wire clamp; the hammer head of the damper is formed by connecting a solid hammer head and a hollow hammer head through a flange, the solid hammer head and a steel strand are pressed together through a sleeve, and the top of the solid hammer head and the steel strand are encapsulated together by tin; the hollow hammer head is provided with a set of damping fluid energy dissipation and vibration reduction device which consists of a spherical hollow shell, a partition plate and damping fluid, and the partition plate in the hollow hammer is provided with two middle holes, namely a big hole and a small hole, so that the flowing resistance of the damping fluid is increased; the lower part of the wire clamp is connected with a steel strand in a stamping way, and the hammer head is riveted with the steel strand; the vibration-proof hammer wire clamp consists of a power transmission wire clamp head, an S-shaped damping energy-consumption metal plate, a steel strand fastener and a fastening bolt; the S-shaped damping energy dissipation metal plate is connected with the wire clamp through a fastening bolt; the bottom of the wire clamp is provided with a through hole, and the steel strand penetrates through the through hole and is connected with the wire clamp body in a crimping mode.
The purpose of the invention is realized by the following technical scheme:
the invention provides an anti-vibration hammer, which comprises a damping piece arranged vertically and horizontally, and comprises: the transversely arranged damping parts are composed of damping parts symmetrically arranged on the same horizontal plane; the vertical damping piece and the transverse damping piece are vertically connected, and the connection point of the vertical damping piece and the transverse damping piece is located at the midpoint of the transverse damping piece.
The damping parts symmetrically arranged on the same horizontal plane comprise a left damping part and a right damping part; each part of damping piece is a steel strand damping piece made of steel materials which are arranged in sequence, a cylindrical damping piece which is axially provided with a groove for fixing the steel strand, and a hemispherical damping piece which contains a damping liquid medium.
Preferably, the vertical damping piece comprises a steel strand connecting piece, a damping piece and a wire connecting piece which are sequentially arranged from bottom to top.
Preferably, the damping member is a bent serpentine metal plate.
Preferably, the steel strand connecting piece is provided with a through hole for fixing the steel strand and a bolt fixing hole connected with the vertical damping piece; the wire connecting piece is provided with a bolt fixing hole connected with the vertical damping piece and a through hole provided with a rubber ring on the inner wall connected with the wire.
Preferably, the opening end of the groove of the cylindrical damping piece is the opening end of the outward flange; and a circular through hole with at least two diameters, which is vertical to the axial direction of the steel strand, is arranged in the semicircular damping piece.
Preferably, the diameters of the through holes with the two diameters are 1 mm-2 mm and 0.5 mm-1 mm respectively, the sum of the areas of the through holes accounts for 40% -60% of the area of the whole partition plate, and the through holes with the two diameters are arranged at intervals
Preferably, the semicircular damping piece is made of Ti-15, Mo-3, AI-2.7, Nb-0.2 and Si.
Preferably, the closed end of the cylindrical damping member is flanged with the open end of the hemispherical damping member.
Preferably, the damping liquid medium is made of dimethyl silicone oil.
The invention also provides a damper and a method for determining the damping liquid medium in the damper medium quality determination method, which comprises the following steps:
obtaining acceleration resonance frequency based on an acceleration amplitude-frequency characteristic curve of the damper;
calculating the natural frequency according to the acceleration resonance frequency;
the mass of the damping liquid medium is calculated from the natural frequency.
Preferably, the calculation formula of the natural frequency is;
where ω is the acceleration resonance frequency, ωnIs the natural frequency of the shock absorber and ξ is the damping ratio of the shock absorber.
Preferably, the calculation formula of the mass of the damping liquid medium is as follows:
in the formula mfTo damp the mass of the liquid medium, wnK is the natural frequency of the damper, k is the stiffness of the damper, m1Being the body of a shock absorberAnd (4) structural quality.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the invention provides an anti-vibration hammer and a method for determining the quality of a damping fluid medium in the anti-vibration hammer, wherein the anti-vibration hammer comprises damping parts which are vertically and transversely arranged, and the transversely arranged damping parts are composed of damping parts which are symmetrically arranged on the same horizontal plane; the vertical damping piece and the transverse damping piece are vertically connected, and the connection point of the vertical damping piece and the transverse damping piece is located at the midpoint of the transverse damping piece. This damper has three kinds of power consumption structures: namely a hemispherical damping part containing a damping liquid medium, a steel strand structure depending on friction energy consumption between strands and a vertical damping part with hysteretic energy consumption capability. The three sets of energy consumption systems all consume and dissipate vertical wind vibration energy, so that the two sets of energy consumption systems disclosed by the invention can effectively reduce vertical wind vibration of a large span wire in a span.
2. The novel damper provided by the invention has good automatic activation performance and can widen the vibration reduction frequency range. The damper uses a damping fluid vibration damping device to deal with the current excitation frequency, and deals with the excitation frequency possibly generated by the outside by the steel strand and the S-shaped energy consumption metal plate. The effective vibration reduction frequency bandwidth of the novel damper is improved through three damping vibration reduction systems. Therefore, the damper can reduce the dynamic response caused by vertical wind vibration of the wire in a wider frequency range.
3. The S-shaped energy dissipation metal plate in the novel damper provided by the invention has the function of buffering the acting force between the damper and the power transmission conductor, so that the abrasion of the damper on the conductor is reduced.
4. The partition plate in the damping fluid energy consumption device disclosed by the invention adopts a half-moon-shaped structural design with two circular holes, and the structural design increases the resistance of damping fluid passing through the partition plate and obviously increases the damping energy consumption capacity of the damper.
5. The novel damper provided by the invention has self-adaptive capacity, and can change self parameters according to the change of external excitation, so that the self natural frequency is kept consistent with the external excitation frequency, and a better damping effect is obtained.
6. The novel damper provided by the invention has the characteristics of easiness in installation, no maintenance and good durability. The invention designs the structure of the high damping liquid package, so that the high damping liquid package can be hung in the air without oil leakage, and has the advantages of no maintenance and good durability.
7. The novel vertical wind vibration mechanical model of the damper provided by the invention can be applied to finite element calculation of dynamic characteristics of a wire and the damper, the finite element calculation result of the model can obviously improve the accuracy of the dynamic characteristic calculation of the damper, and the calculation result is closer to the test result.
8. The parameter identification and optimization method for the vertical wind vibration mechanics model of the novel damper, provided by the invention, can identify the inherent frequency and damping ratio of each order of the damper and optimize the two parameters, so that the energy consumption and vibration reduction effects of the damper are improved.
9. The deformation resistance is good, and the shell is made of novel materials, so that the shell can be prevented from being corroded in a severe environment, and can not generate plastic deformation under the influence of long-term micro-vibration and dead weight pressure.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a top view of a damper provided in accordance with the present invention;
FIG. 2 is a front view of the damper provided by the present invention;
FIG. 3 is a design of the baffle and pass provided by the present invention;
FIG. 4 is a front view of the wire clamp body provided by the present invention;
FIG. 5 is a left side view of the wire clamp body provided by the present invention;
FIG. 6 is a top view of a wire clamp body provided by the present invention;
FIG. 7 is a mechanical model of the damper provided by the present invention;
reference numerals:
1-wire clamp, 2-steel strand, 3-solid hammer, 4-hollow hammer, 5-damping liquid, 6-partition plate, 7-flange plate, 8-fastening bolt I, 9-steel sleeve, 10-tin seal, 11-energy dissipation metal plate, 12-large hole, 13-small hole, 14-wire clamp pressing plate, 15-wire clamp body, 16-hinge pin, 17-steel strand hole, 18-fastening bolt II and 19-rubber.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
A damper and a method for determining the medium quality of a damping fluid in the damper are provided, wherein the damper comprises a damping piece which is vertically and horizontally arranged, and comprises the following steps: the transversely arranged damping parts are composed of damping parts symmetrically arranged on the same horizontal plane; the vertical damping piece and the transverse damping piece are vertically connected, and the connection point of the vertical damping piece and the transverse damping piece is located at the midpoint of the transverse damping piece. The vertical damping member in this embodiment is a wire clamp 1.
The damping parts symmetrically arranged on the same horizontal plane comprise a left damping part and a right damping part; each part of damping piece is a steel strand damping piece made of steel materials which are arranged in sequence, a cylindrical damping piece which is axially provided with a groove for fixing the steel strand, and a hemispherical damping piece which contains a damping liquid medium. In this embodiment, the steel strand damping member is a steel strand 2, the cylindrical damping member is a solid hammer 3, the hemispherical damping member is a hollow hammer 4, and the damping liquid medium is damping liquid 5.
Vertical damping piece includes, follows supreme steel strand wires connecting piece, damping piece and the wire connecting piece that sets gradually down. In this embodiment, the steel strand connecting member is a steel strand hole 17, and the wire connecting member is a wire clamp body 15.
The damping member is a bent serpentine metal plate. The serpentine metal plate bent in this embodiment is a power dissipating metal plate 11.
The steel strand connecting piece is provided with a through hole for fixing the steel strand and a bolt fixing hole connected with the vertical damping piece; the wire connecting piece is provided with a bolt fixing hole connected with the vertical damping piece and a through hole provided with a rubber ring on the inner wall connected with the wire. In this embodiment, the through hole of the steel strand connecting member is a steel strand hole 17, and the rubber ring is rubber 19.
The opening end of the groove of the cylindrical damping piece is the opening end of the outward flange; and a circular through hole with at least two diameters, which is vertical to the axial direction of the steel strand, is arranged in the semicircular damping piece.
The diameters of the through holes with the two diameters are 1 mm-2 mm and 0.5 mm-1 mm respectively, the sum of the areas of the through holes accounts for 40% -60% of the area of the whole partition board, and the through holes with the two diameters are arranged at intervals. In the embodiment, the diameter of the big hole is 1 mm-2 mm 12, and the diameter of the small hole is 0.5 mm-1 mm 13.
The semicircular damping piece is made of Ti-15, Mo-3, AI-2.7, Nb-0.2 and Si.
The closed end of the cylindrical damping member is connected with the open end of the hemispherical damping member by a flange 7.
The damping liquid medium is made of dimethyl silicone oil.
A method for determining a damping liquid medium in a method for determining the mass of the damping liquid medium in a damper comprises the following steps:
obtaining acceleration resonance frequency based on an acceleration amplitude-frequency characteristic curve of the damper;
calculating the natural frequency according to the acceleration resonance frequency;
the mass of the damping liquid medium is calculated from the natural frequency.
The calculation formula of the natural frequency is as follows;
where ω is the acceleration resonance frequency, ωnIs the natural frequency of the shock absorber and ξ is the damping ratio of the shock absorber.
The calculation formula of the mass of the damping liquid medium is as follows:
in the formula mfTo damp the mass of the liquid medium, wnK is the natural frequency of the damper, k is the stiffness of the damper, m1Is the structural mass of the body of the shock absorber.
The novel damper provided by the invention adopts an assembled integral structure design. The integral structure of the damper consists of a steel strand 2, a hammer head and a wire clamp 1. The hammer head of the damper is formed by connecting a solid hammer head 3 and a hollow hammer head 4 through a flange 7, wherein the solid hammer head 3 and a steel strand 2 are pressed together through a steel sleeve 9, and the top parts of the solid hammer head and the steel strand are sealed together by tin 10; the hollow hammer head 4 is internally provided with a set of damping fluid energy dissipation and vibration reduction device which is composed of a spherical hollow shell, a partition plate 6 and damping fluid 5, the partition plate 6 in the hollow hammer head 4 adopts a half-moon-shaped structural design with two circular holes, the diameters of the two circular holes are respectively 1-2 mm and 0.5-1 mm, the percentage of the total area of the holes in the whole partition plate is 40-60%, the holes with two different diameters are arranged at intervals, the design structure of the partition plate increases the resistance of the damping fluid passing through the partition plate, and the damping energy dissipation capacity of the damper is obviously increased. The lower part of the wire clamp 1 is connected with a steel strand in a punching mode, and the hammer head is connected with the steel strand in a riveting mode, as shown in attached figures 1, 2 and 3.
The overall structure of the novel damper is shown in figures 1, 2 and 3. The hammer head of the damper is formed by connecting a solid hammer head 3 and a hollow hammer head 4 through a flange 7, wherein the solid hammer head 3 and a steel strand 2 are pressed together through a steel sleeve 9, and the top parts of the solid hammer head and the steel strand are sealed together by tin 10; the hollow hammer head 4 is internally provided with a set of damping fluid energy dissipation and vibration reduction device which consists of a spherical hollow shell, a partition plate 6 and damping fluid 5. The clapboard 6 in the hollow hammer 4 is provided with a big hole 12 and a small hole 13, the lower part of the wire clamp 1 is connected with a steel strand by punching, and the hammer is riveted with the steel strand. The baffle 6 inside the hollow hammer adopts a half-moon-shaped structural design with two circular holes, the diameters of the two circular holes are respectively 1 mm-2 mm and 0.5 mm-1 mm, the percentage of the sum of the areas of the circular holes in the whole baffle is 40% -60%, and the design structure of the baffle adopting the mode of interval arrangement for the holes with two different diameters increases the resistance of the damping fluid passing through the baffle, thereby obviously increasing the damping energy consumption capacity of the damping fluid.
The damper wire clamp 1 is composed of a clamp body 15, an energy dissipation metal plate 11, a steel strand fastener and a fastening bolt 18. The end of the energy dissipating metal plate 11 is inserted into a groove formed in the wire clamp body 15 and is connected to the wire clamp body 15 by a fastening bolt 18, as shown in fig. 4, 5 and 6. The design mode of the wire clamp structure is given. In addition, the bottom of the clamp is provided with a through hole, and the steel strand 2 passes through the through hole and is connected with the clamp body 15 in a compression joint mode.
The structure design mode of the wire clamp is shown in the attached figures 4, 5 and 6. The wire clamp 1 consists of a wire clamp body 15, an energy dissipation metal plate 11, a steel strand fastener and a fastening bolt 18. The end of the energy dissipation metal plate 11 is inserted into a groove of the wire clamp body 15 and connected with the wire clamp body 15 through a fastening bolt 18 to provide a structural design mode of the wire clamp. In addition, the bottom of the clamp is provided with a through hole, and the steel strand 2 passes through the through hole and is connected with the clamp body 15 in a compression joint mode.
The invention provides a multi-damping variable-mass damper. When the damper moves under the action of wind load, the damping fluid in the damping fluid vibration attenuation device moves to the opposite direction of the damper movement due to inertia, so that pressure opposite to the direction of the damper movement is generated, the pressure acts on a transmission line through the damper, and the effect of reducing the wind vibration of a transmission conductor is achieved; in addition, the viscosity of the damping liquid in the damping device can also play a role in dissipating wind energy, namely the damper plays a role in damping the transmission conductor by utilizing the hydrodynamic pressure generated by the liquid shaking and the energy consumption of the damping liquid. The mass of the horizontal vibration damper is changed by changing the liquid amount in the damping liquid box body, so that the natural frequency of the horizontal vibration damper is changed, the natural frequency of the horizontal vibration damper is consistent with the current horizontal wind vibration frequency, and the optimal damping effect is achieved. The baffle plate arranged in the hollow hammer increases the flowing resistance of the damping liquid, thereby further increasing the damping energy consumption effect of the hollow hammer. In addition, vertical vibration energy is dissipated among the steel strand wires of the damper through friction; the S-shaped metal connecting metal plate can dissipate vertical vibration energy through repeated axial expansion and contraction, and can also reduce acting force between the damper and the lead, so that abrasion between the damper and the lead is reduced. Therefore, the novel damper provided by the invention has the following functions: firstly, the energy consumption capability is strong. The damper has three energy dissipation mechanisms: namely viscous damping energy consumption of damping fluid in the hollow hammer, friction damping energy consumption between strands of the steel strand and hysteretic energy consumption of the S-shaped energy consumption metal plate. Second, there is a buffering of the force between the damper and the power conductor, thereby reducing wear of the conductor to the damper. And thirdly, the frequency range for preventing the vertical vibration of the lead is wide, and the damper has self-adaptive capacity and can change self parameters according to the change of external excitation, so that the self natural frequency is kept consistent with the external excitation frequency, and a better broadband vibration reduction effect is obtained. Fourthly, the method has the advantages of maintenance-free and good durability. The invention designs the structure of the high damping liquid package, so that the high damping liquid package can be hung in the air without oil leakage, and has the advantages of no maintenance and good durability. Fifthly, the novel damper has the advantages of easy installation, good automatic activation performance, easy matching of frequency modulation and the like. The novel damper provided by the invention has good automatic activation performance and can widen the vibration reduction frequency range. The damper uses a damping fluid vibration damping device to deal with the current excitation frequency, and deals with the excitation frequency possibly generated by the outside by the steel strand and the S-shaped energy consumption metal plate. The effective vibration reduction frequency bandwidth of the novel damper is improved through three damping vibration reduction systems. Therefore, the damper can reduce the dynamic response caused by vertical wind vibration of the wire in a wider frequency range.
The novel damper is composed of a solid hammer head M1And the hollow hammer head and the damping liquid mass M inside the hollow hammer headfTwo parts are formed. The damper is a steel strand friction damper C0S-shaped metal plate hysteresis damping C1And viscous damping C generated by viscous damping fluid in hollow hammer2And (4) forming. The damper has a stiffness of K. The control force F of the damper to the vertical breeze vibration of the transmission conductor generally consists of two parts: a part is the interaction force F between the lead and the damper1And generation of damping fluid in hollow hammer and1control force F in the opposite direction2The composition is shown in figure 7.
Fig. 7 shows a mechanical model of the damping device. It can be seen that: the mass of the damper is composed of a solid hammer head M1And the hollow hammer head and the damping liquid mass M inside the hollow hammer headfTwo parts are formed. The damper is a steel strand friction damper C0S-shaped metal plate hysteresis damping C1And inside the hollow hammerViscous damping fluid of (2) viscous damping fluid of (C)2And (4) forming. The damper has a stiffness of K. The control force F of the damper to the vertical breeze vibration of the transmission conductor generally consists of two parts: a part is the interaction force F between the lead and the damper1And generation of damping fluid in hollow hammer and1control force F in the opposite direction2The differential equation of motion of the novel damper with variable mass can be written as follows:
during the working process of the damper: mass M of viscous damping fluid when inside hollow hammerfCan be from 0 to MfmaxThe range is adjusted according to the external excitation condition, so that the variable range of the mass of the damper is M1To M1+Mfmax. Therefore, the natural frequency ω of the dampernComprises the following steps:
as can be seen from equation 2: mass M of liquidfFrom 0 to MfmaxNatural frequency omega of the damper when varied within a rangenAlso varies therewith, in the range of
To
Therefore, when the external frequency ω is located at
To
When the frequency is within the range, the natural frequency can be adjusted to be in accordance with the external frequency by adjusting the mass of the damping fluid in the damping fluid deviceThe frequency ω remains consistent to maximize the energy dissipating capacity of the damper. The novel vertical wind vibration mechanical model of the damper provided by the invention can be applied to finite element calculation of dynamic characteristics of a wire and the damper, the finite element calculation result of the model can obviously improve the accuracy of the dynamic characteristic calculation of the damper, and the calculation result is closer to the test result.
The modal mass of the basic vibration mode of the damping fluid is generally 1-10% of that of the damper.
From the upper mechanical model, it can be seen that: as long as the mass of the liquid of the horizontal damper is adjusted, the natural frequency of the damper is kept consistent with the external frequency, and the damper can obtain the best horizontal wind vibration damping effect. In order to measure the damping and natural frequency of the damper, the invention designs a set of test device. The device comprises an electromagnetic vibration table, a damper, an acceleration sensor and the like. The method comprises the steps of rigidly fixing the damper on an electromagnetic vibration table, carrying out sine sweep excitation on the damper, enabling the frequency range to be 5-120 Hz, obtaining the exciting force of the vibration table on the damper through a force sensor, obtaining the acceleration of a wire clamp through an acceleration sensor, obtaining the speed of the wire clamp through integration, and synchronously recording the frequency, the speed, the force and the phase difference of a data acquisition card in each acquisition period, thereby obtaining the impedance spectrum of the damper under different vibration speeds. According to the impedance spectrum obtained by the experiment, the natural frequency of each order of the damper, the corresponding impedance value and the corresponding half-power point at different excitation speeds can be obtained.
The invention adopts a single mode identification method to identify the natural frequency and the damping ratio of each order from a frequency response function curve. Calculating the damping ratio of the damper by a half-power point method, and setting fn，ReThe natural frequency and the corresponding impedance value are respectively, the half power point is RePoint corresponding to/2, which corresponds to frequency fa，fbAre respectively located at fnOn both sides, the natural frequency of the damper corresponds to a damping ratio of
In the vibration process, the purpose of widening the frequency reduction band of the novel damper is achieved by changing the mass of the damping liquid loaded by the damper. The frequency range of the novel damper to effectively damp the vibration of the wire is 10 Hz-80 Hz through tests, and the damping ratio range is as follows: 0.05 to 0.2.
The natural frequency is an important characteristic parameter of a vibrating system, which depends on the mass and stiffness of the system itself. In experiments, a common method for measuring parameters of a vibration system is often used in a resonance method, i.e., a method for estimating a natural frequency by using a relationship between the natural frequency and a resonance frequency. The resonance frequency is an excitation frequency corresponding to a resonance of the vibration system and a maximum response amplitude. The response of the shock absorber is acceleration, which is referred to as the acceleration resonance frequency. In the natural frequency identification experiment of the shock absorber, an acceleration amplitude-frequency characteristic curve of the shock absorber needs to be measured, the acceleration resonance frequency omega of the shock absorber is determined through the curve, and then the natural frequency of the shock absorber is respectively omega according to the calculation formula 4 of the natural frequency by solvingn。
Where ω is the acceleration resonance frequency, ωnIs the natural frequency of the shock absorber and ξ is the damping ratio of the shock absorber.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention is included in the scope of the claims of the present invention filed as filed.
Claims (12)
1. The utility model provides a damper, damper includes vertical and horizontal damping piece that sets up, its characterized in that includes: the transversely arranged damping parts are composed of damping parts symmetrically arranged on the same horizontal plane; the vertical damping piece and the transverse damping piece are vertically connected, and the connection point of the vertical damping piece and the transverse damping piece is located at the midpoint of the transverse damping piece.
The damping parts symmetrically arranged on the same horizontal plane comprise a left damping part and a right damping part; each part of damping piece is a steel strand damping piece made of steel materials which are arranged in sequence, a cylindrical damping piece which is axially provided with a groove for fixing the steel strand, and a hemispherical damping piece which contains a damping liquid medium.
2. The damper of claim 1, wherein the vertical damping member comprises, in order from bottom to top, a strand connector, a damping member, and a wire connector.
3. The damper of claim 2, wherein said damping member is a bent serpentine metal plate.
4. The damper of claim 2, wherein said strand connector is provided with a through hole for fixing said strand and with a bolt fixing hole for connecting said vertical damping member; the wire connecting piece is provided with a bolt fixing hole connected with the vertical damping piece and a through hole provided with a rubber ring on the inner wall connected with the wire.
5. The damper according to claim 1, wherein the open end of the groove of the cylindrical damping member is an open end of the outward flange; and a circular through hole with at least two diameters, which is vertical to the axial direction of the steel strand, is arranged in the semicircular damping piece.
6. The damper according to claim 5, wherein the two kinds of apertures have diameters of 1mm to 2mm and 0.5mm to 1mm, respectively, the sum of the aperture areas accounts for 40% to 60% of the area of the partition plate, and the through holes of the two kinds of diameters are arranged at intervals.
7. The damper according to claim 5, wherein the semicircular damper is made of Ti-15, Mo-3, AI-2.7, Nb-0.2, Si.
8. The damper of claim 1, wherein the closed end of said cylindrical damper member is flanged to the open end of said hemispherical damper member.
9. The damper and the method for determining the mass of the damping fluid medium in the damper according to claim 1, wherein the damping fluid medium is dimethyl silicone oil.
10. A method for determining a damping liquid medium in a method for determining the mass of the damping liquid medium in a damper is characterized by comprising the following steps:
obtaining acceleration resonance frequency based on an acceleration amplitude-frequency characteristic curve of the damper;
calculating the natural frequency according to the acceleration resonance frequency;
the mass of the damping liquid medium is calculated from the natural frequency.
11. The damper and the method for determining the mass of the damping fluid medium in the damper according to claim 10, wherein the natural frequency is calculated by the formula;
where ω is the acceleration resonance frequency, ωnIs the natural frequency of the shock absorber and ξ is the damping ratio of the shock absorber.
12. The method for determining the mass of the damping fluid medium in the damper and the damper according to claim 10, wherein the mass of the damping fluid medium is calculated by the formula:
in the formula mfTo damp the mass of the liquid medium, wnK is the natural frequency of the damper, k is the stiffness of the damper, m1Is the structural mass of the body of the shock absorber.
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| CN112582962B (en) | 2023-09-08 |
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