CN113152709A - Damping method for breeze vibration of circular tube component of power transmission tower - Google Patents
Damping method for breeze vibration of circular tube component of power transmission tower Download PDFInfo
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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
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
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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
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
- E04H12/10—Truss-like structures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The invention discloses a damping method for breeze vibration of a circular tube component of a power transmission tower, which comprises the following steps: the method comprises the steps of firstly carrying out field investigation and determining circular tube members needing vibration reduction on a power transmission tower, then selecting at least one iron tower fixing part close to the circular tube members on the power transmission tower for each circular tube member, and then installing an adjustable inertial container between the circular tube members and the iron tower fixing part to suppress vibration of the circular tube members. The invention has the beneficial effects that: the inertial container used in the invention has the advantages of simple structure, low economic cost and convenient use, is easy to adjust the inertia force characteristic by adjusting the structure of the inertial container so as to meet the vibration reduction requirement of the circular tube component of the power transmission tower, and can obtain ideal vibration reduction effect as proved by simulation experiments and engineering practices.
Description
Technical Field
The invention belongs to the technical field of wind vibration protection of power transmission tower components, and particularly relates to a damping method for breeze vibration of a circular tube component of a power transmission tower.
Background
A power transmission tower is a steel structure building for supporting cables, and is generally formed by connecting rods, pipes and plates. The safety of the transmission tower is the basis for the safety of the whole transmission line. Meteorological conditions are important external factors influencing the safety of the power transmission tower, wherein the wind vibration phenomenon of the rod and the pipe is one of the most common factors influencing the safety of the power transmission tower, and the vibration mechanism of the rod and the pipe is complex. The suppression of wind vibration has important significance for improving the safety of the power transmission tower. For the circular tube component of the power transmission iron tower, the circular tube component can generate vibration vertical to the windward side when the circular tube component vibrates in breeze, and the vibration along the downwind direction can be ignored, so that the circular tube component can be regarded as single-degree-of-freedom vibration. Considering that the wind vibration phenomenon of the circular pipe member is relatively simple, it is easier to cope therewith. The prior art discloses some damper-based vibration dampers. Chinese patent document CN 111164326 a discloses a rotary damper for wind power equipment or buildings and a vibration damper equipped with the rotary damper, which converts vibration at a sway bar or a sway rope into rotation of a component of an attenuation module, which plays a role of vibration attenuation based on a vortex attenuation module, friction attenuation, fluid damper or conventional magnet attenuation principle. However, the vibration damper is relatively complex in structure and high in cost, and is not suitable for damping a plurality of round rod members on a transmission tower. There is still a lack of a simple and effective method for suppressing the vibration of the round bar member.
Disclosure of Invention
In view of the above, the present invention provides a damping method for breeze vibration of a circular pipe member of a power transmission tower.
The technical scheme is as follows:
a damping method for breeze vibration of a circular tube component of a power transmission tower is characterized by comprising the following steps:
firstly, carrying out on-site investigation and determining a circular tube component needing vibration reduction on a power transmission tower;
selecting at least one iron tower fixing part close to the circular pipe component for each circular pipe component on the power transmission tower, and installing an adjustable inertial container between the circular pipe component and the iron tower fixing part;
the adjustable inertial container comprises a bracket, and a flywheel and a rotation driving mechanism are arranged on the bracket;
a speed-increasing transmission mechanism is arranged between the rotation driving mechanism and the flywheel, the speed-increasing transmission mechanism is detachably arranged on the bracket, and the speed-increasing transmission mechanism allows the inertia force of the adjustable inertial container to be adjusted by changing the structure of the speed-increasing transmission mechanism;
the rotation driving mechanism is provided with a first connecting end, and the bracket is provided with a second connecting end;
step three, mounting an adjustable inertial container: and connecting the first connecting end with the circular tube member, and connecting the second connecting end with the iron tower fixing part, so that the rotation driving mechanism converts the vibration of the circular tube member into the rotary motion of the flywheel, and the vibration of the circular tube member is inhibited.
Preferably, the vibration damping method further comprises a fourth step of observing a vibration damping effect; if the vibration reduction effect is insufficient, the mass of the flywheel or the structure of the speed-increasing transmission mechanism is changed to improve the inertia force of the adjustable inertial container.
Preferably, the first connecting end is provided with a pipe sleeve, and in the third step, the pipe sleeve is sleeved on the middle part of the circular pipe member.
Preferably, the speed-increasing transmission mechanism is a gear transmission mechanism and comprises at least one speed-increasing gear pair, and the speed-increasing gear pair comprises a large gear and a small gear which are meshed with each other;
in the transmission direction, the bull gear of the first stage is driven by the rotary driving mechanism, and the pinion gear of the last stage and the flywheel rotate coaxially;
in the fourth step, the inertia force of the adjustable inertial container is adjusted by increasing or decreasing the number of the speed-increasing gear pairs or changing the radius ratio of the large gear and the small gear.
Preferably, the rotation driving mechanism is a rack and pinion mechanism, and includes a driving rack and a driven gear, the driving rack is slidably disposed on the bracket, and any end of the driving rack extends out of the bracket to form the first connection end;
the driven gear is rotatably installed on the support and meshed with the driving rack, and the driven gear is coaxially arranged with the large gear of the first stage of the speed-increasing transmission mechanism.
Preferably, the large gear of the speed-increasing gear pair of the next stage and the small gear of the speed-increasing gear pair of the adjacent previous stage are coaxially arranged to form a duplicate gear, and a gear shaft of the duplicate gear is rotatably installed on the support;
the driven gear and the large gear of the first stage of the speed-increasing transmission mechanism also form the duplicate gear.
Preferably, the masses of the driven gear, the large gear and the small gear do not exceed the mass 1/10 of the flywheel respectively.
Preferably, in the third step, when the adjustable inerter is installed, an included angle θ between the length direction of the driving rack and the pipe axis of the circular pipe member satisfies 0 ° < θ ≦ 90 °.
Preferably, the specific process of the first step is to know on-site meteorological information, investigate and determine a circular pipe member needing vibration reduction on the power transmission tower on site, and judge the vibration direction of the circular pipe member;
and in the third step, when the adjustable inertial container is installed, the driving rack is positioned in the vibration surface of the circular tube component.
Preferably, in the third step, when the adjustable inerter is installed on the horizontally arranged circular tube member, the driving rack is located in the vertical direction;
for the circular tube component which is vertically or obliquely arranged, if the vibration plane of the circular tube component exceeds one, two adjustable inertial containers are arranged, and the included angle of the driving racks of the two adjustable inertial containers is larger than 0 degree and smaller than 180 degrees.
Compared with the prior art, the invention has the beneficial effects that: the inertial container used in the invention has the advantages of simple structure, low economic cost and convenient use, is easy to adjust the inertia force characteristic by adjusting the structure of the inertial container so as to meet the vibration reduction requirement of the circular tube component of the power transmission tower, and can obtain ideal vibration reduction effect as proved by simulation experiments and engineering practices.
Drawings
FIG. 1 is a schematic structural diagram of an adjustable inerter used for damping vibration of a circular pipe component of a power transmission tower;
FIG. 2 is a schematic view illustrating the installation of an adjustable inerter;
FIG. 3 is a schematic structural diagram of an adjustable inerter;
FIG. 4 is a schematic view of a multi-stage step-up gear pair between a driving rack and a flywheel for transmission;
FIG. 5 is a schematic diagram of a finite element simulation experiment for studying the influence of different b-value inerter on the breeze vibration amplitude of a circular tube component;
fig. 6 is a schematic view of a pole member susceptible to vibration on a certain type of transmission tower, the pole member being marked with circles;
fig. 7 is a layout scheme of the adjustable inerter on the transmission tower in fig. 6.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example one
Referring to fig. 2, 3 and 4, an adjustable inerter a comprises a bracket 1, wherein a flywheel 4 and a rotation driving mechanism 2 are arranged on the bracket 1 and are in transmission connection. The rotation driving mechanism 2 is provided with a first connecting end for connecting with the vibrating piece; and a second connecting end is arranged on the bracket 1 and is used for being connected with a fixing piece. The vibration of the vibrating piece is transmitted to the flywheel 4 through the rotation driving mechanism 2 and the speed-increasing transmission mechanism to rotate the flywheel, and the inertia force of the adjustable inertial container A reversely acts on the vibrating piece to inhibit the vibration of the vibrating piece.
In order to improve the inertia force of the adjustable inerter A and enable the inertia force to be adjustable, a speed-increasing transmission mechanism is arranged between the rotation driving mechanism 2 and the flywheel 4, the speed-increasing transmission mechanism is detachably mounted on the support 1, and the speed-increasing transmission mechanism allows the inertia force of the adjustable inerter A to be adjusted by changing the structure of the speed-increasing transmission mechanism.
In this embodiment, the speed-increasing transmission mechanism is a gear transmission mechanism, and includes at least one speed-increasing gear pair 3, the speed-increasing gear pair 3 includes a large gear 3a and a small gear 3b that are engaged with each other. In the transmission direction, the large gear 3a of the first stage is driven by the rotary drive mechanism 2, and the small gear 3b of the last stage rotates coaxially with the flywheel 4.
In order to make the adjustable inerter A compact in structure, the big gear 3a of the accelerating gear pair 3 at the next stage and the small gear 3b of the accelerating gear pair 3 at the adjacent previous stage are coaxially arranged to form a duplicate gear, and a gear shaft of the duplicate gear is rotatably installed on the support 1.
In this embodiment, the rotation driving mechanism 2 is a rack-and-pinion mechanism, and includes a driving rack 2a and a driven gear 2b, the driving rack 2a is slidably disposed on the bracket 1, and any end of the driving rack extends out of the bracket 1 to form the first connection end. The driven gear 2b is rotatably installed on the support 1 and meshed with the driving rack 2a, the driven gear 2b is coaxially arranged with the large gear 3a of the first stage of the speed-increasing transmission mechanism, and the driven gear 2b and the large gear 3a of the first stage of the speed-increasing transmission mechanism also form a duplicate gear.
In order to facilitate the installation of the rack and pinion mechanism and each speed-increasing gear pair 3, in this embodiment, the support 1 includes a plurality of longitudinal connecting plates 1a, all the longitudinal connecting plates 1a are arranged in parallel and facing each other, the two ends of the longitudinal connecting plates 1a are respectively provided with a transverse connecting plate 1b, and the same end of the longitudinal connecting plate 1a is fixedly connected with the corresponding transverse connecting plate 1b, so as to form the support 1. The driving rack 2a and the driven gear 2b are arranged between the two longitudinal connecting plates 1a, the first connecting end of the driving rack 2a freely penetrates out of any one transverse connecting plate 1b, and the driving rack 2a is in sliding fit with the two longitudinal connecting plates 1a positioned on the two sides of the driving rack.
The gear shaft of the driven gear 2b, the gear shaft of the duplex gear and the gear shaft of the flywheel 4 are transversely arranged on the longitudinal connecting plates 1a, and the accelerating gear pair 3 is arranged in a gap between the longitudinal connecting plates 1a according to a meshing relationship.
To further increase the inertia forces, the masses of the output gear 2b, gearwheel 3a and pinion 3b do not exceed the mass 1/10 of the flywheel 4, respectively, and these gears can be designed as hollow gears, for example. This enables the vibration of the vibrating member to be more efficiently transmitted to the flywheel 4, thereby enhancing the responsiveness of the adjustable inerter a to vibration.
The inertia force of the adjustable inerter has the formula of
F＝b(a1-a2) (I)，
Wherein b is the characteristic of the inertia container and is related to the number of the duplicate gears, the radius ratio of the big gear 3a and the small gear 3b of the duplicate gears, and the radius ratio of the flywheel 4 and the small gear 3b of the last stage;
a1is the acceleration of the first connection end;
a2acceleration of the second connection end, when the second connection end is fixedly connected, a2＝0。
In order to facilitate the manufacture of the inerter and the calculation of the inertial force of the inerter, as shown in FIG. 4, the dual gears are identical, as shown in FIG. 4As shown in fig. 4. The duplicate gears between the driving rack 2a and the flywheel 4 are numbered as 1, 2, 3, … … and n according to the transmission direction in sequence, the k1 is more than or equal to k and less than or equal to n, and the radius of the outer ring of the big gear 3a which is an integer number of duplicate gears is recorded as rkThe radius of the inner ring of the pinion 3b of the kth duplicate gear is denoted prk；
The radius of the flywheel 4 is denoted as rrAnd the radius of the inner ring of the pinion gear 3b coaxial with the flywheel 4 is denoted as rpr；
The mass of the flywheel 4 is denoted mf；
Then, the characteristic of the inerter is calculated by the formula
According to the analysis, the characteristic of the inertia container can be changed by changing the number of the duplicate gears, or changing the radius size ratio of the large gear 3a and the small gear 3b of the duplicate gears, or changing the radius size ratio of the flywheel 4 and the small gear 3b of the last stage, or changing the mass of the flywheel 4, so as to adjust the inertia force.
Example two
A damping method for breeze vibration of a circular tube component of a power transmission tower uses the adjustable inerter of the first embodiment, and comprises the following steps:
the method comprises the steps of firstly, knowing on-site meteorological information, carrying out on-site investigation, determining a circular tube component 5 needing vibration reduction on a power transmission tower B, and judging the vibration direction of the circular tube component 5;
selecting at least one iron tower fixing part 6 close to the circular tube member 5 on the power transmission tower B for each circular tube member 5, so as to install an adjustable inerter A between the circular tube member 5 and the iron tower fixing part 6;
step three, as shown in fig. 1 and 2, installing an adjustable inerter A: for convenient connection, the first connecting end is provided with a pipe sleeve 2c, the pipe sleeve 2c is sleeved on the circular pipe member 5, and the second connecting end is connected with the iron tower fixing part 6, so that the rotation driving mechanism 2 converts the vibration of the circular pipe member 5 into the rotation motion of the flywheel 4, and the vibration of the circular pipe member 5 is restrained.
The circular tube component 5 is subjected to the inertia acting force of the adjustable inerter A
F’＝b(a1-a2)sinθ (III)，
Wherein a is1The vibration acceleration of the first connecting end, namely the circular tube component;
since the second connecting end is fixedly connected to the iron tower fixing part 6, a2＝0；
Wherein θ is an angle between the length direction of the driving rack 2a and the pipe axis of the circular pipe member 5. In order to achieve the effect of vibration reduction, theta of the adjustable inertial container A satisfies 0 degree < theta ≦ 90 degrees when being installed. From the formula (III), θ is preferably 90 °.
Further, when the driving rack 2a is positioned in the vibration plane of the circular tube member 5, the inertial force of the inerter can be transmitted to the circular tube member 5 most effectively. Therefore, the driving rack 2a should be located as much as possible in the vibration plane of the circular tube member 5.
According to the above formula (II), by changing the factor related to the value b, the inertial force F' of the adjustable inerter a to which the circular tubular member 5 is subjected can be adjusted to reduce the vibration amplitude of the circular tubular member 5 to an appropriate range.
For the horizontally arranged circular tube member 5, because stable vertically blowing wind hardly occurs, the driving rack 2a is located in the vertical direction when the adjustable inerter a is installed for the circular tube member 5.
For the circular tube component 5 which is vertically or obliquely arranged, the requirement can be met by arranging an adjustable inertial container A generally because the circular tube component 5 has higher rigidity; if the vibration plane exceeds one or the circular tube member 5 is longer, two adjustable inerter A can be arranged according to the requirement, and the included angle of the driving racks 2a of the two adjustable inerter A is larger than 0 degree and smaller than 180 degrees.
According to the field situation, after the adjustable inerter A is installed, the step four is carried out, the vibration reduction effect is observed, for example, the vibration amplitude of the circular tube component 5 after vibration stabilization does not exceed 3mm and serves as a vibration reduction target; if the vibration reduction effect is insufficient, the mass of the flywheel 4 is increased or the structure of the speed-increasing transmission mechanism is adjusted to improve the inertia force of the adjustable inertial container A.
In order to improve the inertia force of the adjustable inertial container A, the method for adjusting the structure of the speed-increasing transmission mechanism comprises the following steps: the number of the speed-increasing gear pairs 3 is increased, or/and the gear wheel 3a and the pinion 3b are replaced to increase the radius ratio of the gear wheel to the pinion, so that the characteristic b value of the inerter is increased, and the inertia force of the adjustable inerter A is increased.
EXAMPLE III
And researching the vibration reduction effect of the adjustable inertial container by adopting an ANSYS finite element model. In the simulation, a certain extra-high voltage alternating current transmission line project is taken as a research object, and a round pipe rod piece 5 which frequently generates a breeze vibration phenomenon in the extra-high voltage alternating current transmission line is selected for research, wherein the size parameters and constraint conditions of the round pipe rod piece are shown in table 1.
TABLE 1 parameter table of round tube components
In the simulation, the relevant parameters of the adjustable inerter a are shown in table 2. The simulation tests 1-3 change the characteristic b value of the inerter only by changing the mass of the flywheel 4. In the corresponding condition, the amplitude of the circular tube member 5 is as shown in fig. 5. It can be seen that the amplitude of the circular tube member 5 after the vibration was stabilized was about 15mm under the condition that the inerter was not mounted, that is, b was 0; under the condition of the simulation test 1, the amplitude of the circular tube component 5 is about 14mm after the vibration is stable; under the condition of the simulation test 2, the amplitude of the circular tube component 5 is about 6mm after the vibration is stable; under the condition of the simulation test 3, the amplitude of the circular tube member 5 is reduced to 3mm after the vibration is stabilized. The simulation test shows that the damping effect can be effectively improved by increasing the b value.
TABLE 2 duplicate gear and flywheel parameter table for simulation test
This simulation experiment can be used before step three of example two. Before the adjustable inerter A is installed, an ANSYS finite element model is established according to the formula (I) and the parameters of the circular tube member 5, the model is used for analyzing the characteristic b value of the inerter of the adjustable inerter A capable of damping the circular tube member 5, and the number of the duplicate gears, the radius size proportion of the large gear 3a and the small gear 3b of the duplicate gears, the radius size proportion of the flywheel 4 and the small gear 3b of the last stage and the mass of the flywheel 4 are determined according to the formula (II). The adjustable inerter A is designed according to the design and then is installed.
In the fourth step, if the vibration reduction effect is insufficient, the number of the duplicate gears, the radius size ratio of the large gear 3a and the small gear 3b of the duplicate gears, the radius size ratio of the flywheel 4 and the small gear 3b of the last stage and the mass of the flywheel 4 can be changed, the amplitude of the circular tube member 5 is predicted by means of an ANSYS finite element model again, and the structure of the adjustable inerter 5 is determined in an auxiliary mode.
Example four
The vibration reduction method is used for a certain extra-high voltage alternating current transmission line project. After the weather along the line is known, the steel pipe tower with obvious field vibration is investigated, and the investigation about tower types such as SZ30102, SZ30103, SZ30105 and SJ30105 finds that: the front surface of the tower leg, the V-shaped inclined material, the horizontal transverse material of the tower leg partition surface, the inclined material of the tower body above the partition surface and the like are easy to vibrate, as shown in figure 6. The arrangement scheme is established according to specific situations, and is shown in figure 7. When the adjustable inertial container A is installed, the selected iron tower fixing part 6 can be a welded connection node or a platform of an iron tower component, and the iron tower fixing part is not easy to vibrate when wind blows. The practical use discovers that the method can achieve a more ideal vibration reduction effect.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (10)
1. A damping method for breeze vibration of a circular tube component of a power transmission tower is characterized by comprising the following steps:
firstly, carrying out on-site investigation and determining a circular tube component (5) which needs vibration reduction on a power transmission tower (B);
selecting at least one iron tower fixing part (6) close to the circular tube member (5) for each circular tube member (5) on the power transmission tower (B) so as to install an adjustable inerter (A) between the circular tube member (5) and the iron tower fixing part (6);
the adjustable inerter (A) comprises a bracket (1), and a flywheel (4) and a rotation driving mechanism (2) are installed on the bracket (1);
a speed-increasing transmission mechanism is arranged between the rotation driving mechanism (2) and the flywheel (4), the speed-increasing transmission mechanism is detachably arranged on the bracket (1), and the speed-increasing transmission mechanism allows the inertia force of the adjustable inertial container (A) to be adjusted by changing the structure of the speed-increasing transmission mechanism;
the rotation driving mechanism (2) is provided with a first connecting end, and the bracket (1) is provided with a second connecting end;
step three, installing an adjustable inerter (A): and connecting the first connecting end with the circular tube member (5), and connecting the second connecting end with the iron tower fixing part (6) so that the rotation driving mechanism (2) converts the vibration of the circular tube member (5) into the rotation motion of the flywheel (4) to inhibit the vibration of the circular tube member (5).
2. The damping method for the breeze vibration of the circular tube component of the power transmission tower according to claim 1, further comprising the fourth step of observing the damping effect; if the vibration reduction effect is insufficient, the mass of the flywheel (4) or the structure of the speed-increasing transmission mechanism is changed to improve the inertia force of the adjustable inertial container (A).
3. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 2, wherein the method comprises the following steps: and a pipe sleeve (2c) is arranged at the first connecting end, and in the third step, the pipe sleeve (2c) is sleeved at the middle part of the circular pipe component (5).
4. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 3, wherein the method comprises the following steps: the speed-increasing transmission mechanism is a gear transmission mechanism and comprises at least one speed-increasing gear pair (3), and the speed-increasing gear pair (3) comprises a large gear (3a) and a small gear (3b) which are meshed with each other;
in the transmission direction, the large gear (3a) of the first stage is driven by the rotary driving mechanism (2), and the small gear (3b) of the last stage rotates coaxially with the flywheel (4);
in the fourth step, the inertia force of the adjustable inertial container (A) is adjusted by increasing or decreasing the number of the speed-increasing gear pairs (3) or changing the radius ratio of the large gear (3a) and the small gear (3 b).
5. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 4, wherein the method comprises the following steps: the rotary driving mechanism (2) is a gear rack mechanism and comprises a driving rack (2a) and a driven gear (2b), the driving rack (2a) is arranged on the bracket (1) in a sliding mode, and any end of the driving rack (2a) extends out of the bracket (1) to form a first connecting end;
the driven gear (2b) is rotatably installed on the support (1) and meshed with the driving rack (2a), and the driven gear (2b) and the large gear (3a) of the first stage of the speed-increasing transmission mechanism are coaxially arranged.
6. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 5, wherein the method comprises the following steps: a large gear (3a) of the accelerating gear pair (3) of the next stage and a small gear (3b) of the accelerating gear pair (3) of the adjacent previous stage are coaxially arranged to form a duplicate gear, and a gear shaft of the duplicate gear is rotatably arranged on the bracket (1);
the driven gear (2b) and the large gear (3a) of the first stage of the speed-increasing transmission mechanism also form the duplicate gear.
7. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 5, wherein the method comprises the following steps: the masses of the driven gear (2b), the gearwheel (3a) and the pinion (3b) do not exceed the mass 1/10 of the flywheel (4).
8. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 7, wherein the method comprises the following steps: in the third step, when the adjustable inertial container (A) is installed, an included angle theta between the length direction of the driving rack (2a) and the pipe axis of the circular pipe component (5) is 0 degree < theta > or less than or equal to 90 degrees.
9. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 8, wherein the method comprises the following steps: the specific process of the first step is that on-site meteorological information is known, on-site investigation is carried out, a circular tube component (5) which needs vibration reduction on a power transmission tower (B) is determined, and the vibration direction of the circular tube component (5) is judged;
and in the third step, when the adjustable inertial container (A) is installed, the driving rack (2a) is positioned in the vibration surface of the circular tube component (5).
10. The method for damping the breeze vibration of the circular tube component of the power transmission tower according to claim 8, wherein the method comprises the following steps: in the third step, when the adjustable inerter (A) is installed on the horizontally arranged circular tube component (5), the driving rack (2a) is positioned in the vertical direction;
for the circular tube component (5) which is vertically or obliquely arranged, if the vibration plane of the circular tube component exceeds one, two adjustable inerter containers (A) are distributed, and the included angle of the driving racks (2a) of the two adjustable inerter containers (A) is larger than 0 degree and smaller than 180 degrees.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4239213A1 (en) * | 2022-03-03 | 2023-09-06 | General Electric Company | Automatically tunable mass damper |
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