CN113152709B - Vibration reduction method for breeze vibration of circular tube component of power transmission tower - Google Patents
Vibration reduction 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
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- 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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- G06F30/20—Design optimisation, verification or simulation
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Abstract
The invention discloses a vibration reduction method for breeze vibration of a circular tube component of a power transmission tower, which comprises the following steps: firstly, on-site investigation is carried out, circular pipe components which need to be damped on a power transmission tower are determined, then at least one iron tower fixing part which is close to the circular pipe components is selected for each circular pipe component on the power transmission tower, and then an adjustable inertial container is installed between the circular pipe components and the iron tower fixing parts so as to restrain vibration of the circular pipe components. The invention has the beneficial effects that: the inertial container used by the invention has the advantages of simple structure, low economic cost and convenient use, and the inertial force characteristic of the inertial container is easy to adjust 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 simulation experiments and engineering practices prove that the inertial container can obtain an ideal vibration reduction effect.
Description
Technical Field
The invention belongs to the technical field of wind vibration protection of power transmission tower members, and particularly relates to a vibration reduction method for breeze vibration of a power transmission tower circular tube member.
Background
The power transmission tower is a steel structure building for supporting cables and is generally formed by connecting rod pieces, pipe fittings and plate pieces. The safety of the transmission tower is the basis of the safety of the whole transmission line. Meteorological conditions are important external factors affecting the safety of the power transmission tower, wherein wind vibration phenomena of rods and pipes are one of the most common factors affecting the safety of the power transmission tower, and the vibration mechanism is complex. The wind vibration suppression has important significance for improving the safety of the power transmission tower. For the circular tube component of the power transmission tower, when the circular tube component vibrates in breeze, the circular tube component can generate vibration vertical to a windward side, and the vibration in the downwind direction can be ignored, so the circular tube component can be regarded as single-degree-of-freedom vibration. Considering that the wind vibration phenomenon of the circular tube member is relatively simple, the handling is easier. The prior art discloses some damper-based vibration dampers. Chinese patent document CN 111164326A discloses a rotary damper for wind power plants or buildings and a vibration damper equipped with a rotary damper, which converts vibrations at a swinging rod or a swinging rope into rotation of parts of a damping assembly, which plays a role in damping based on eddy current damping assemblies, friction damping, fluid dampers or conventional magnet damping principles. However, the above-mentioned vibration damper is relatively complicated in structure and high in cost, and is not suitable for vibration damping of a plurality of round bar members on a power transmission tower. There is still a need for a simple and effective method of suppressing vibration of a round bar member.
Disclosure of Invention
In view of the above, the invention provides a vibration reduction method for breeze vibration of a circular tube component of a power transmission tower.
The technical scheme is as follows:
the damping method for breeze vibration of the circular tube member of the power transmission tower is characterized by comprising the following steps of:
firstly, on-site investigation and determination of a circular tube member on a power transmission tower, which needs vibration reduction;
selecting at least one iron tower fixing part close to the circular pipe members on the power transmission tower for each circular pipe member, and installing an adjustable inertial container between the circular pipe members and the iron tower fixing parts;
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, and 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 rotary driving mechanism is provided with a first connecting end, and the bracket is provided with a second connecting end;
step three, installing an adjustable inertial container: the first connecting end is connected with the circular tube member, and the second connecting end is connected with the iron tower fixing part, so that the rotation driving mechanism converts vibration of the circular tube member into rotation motion of the flywheel, and vibration of the circular tube member is restrained.
Preferably, the vibration reduction method further comprises a fourth step of observing vibration reduction effects; 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 sleeve, and in the third step, the sleeve is sleeved in the middle of the circular tube member.
Preferably, the speed-increasing transmission mechanism is a gear transmission mechanism and comprises at least one speed-increasing gear pair, wherein the speed-increasing gear pair comprises a large gear and a small gear which are meshed with each other;
in the transmission direction, the large gear of the first stage is driven by the rotation driving mechanism, and the small gear of the last stage and the flywheel coaxially rotate;
in the fourth step, the inertial force of the adjustable inertial container is adjusted by increasing or decreasing the number of the speed increasing gear pairs or changing the large gear and the small gear to change the radius ratio of the large gear and the small gear.
Preferably, the rotation driving mechanism is a rack-and-pinion mechanism, and comprises a driving rack and a driven gear, wherein the driving rack is slidably arranged on the bracket, and any end of the driving rack extends out of the bracket to form the first connecting end;
the driven gear is rotatably arranged on the bracket and meshed with the driving rack, and the driven gear and the large gear of the first stage of the speed increasing transmission mechanism are coaxially arranged.
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 duplex gear, and the gear shaft of the duplex gear is rotatably arranged on the bracket;
the driven gear and the large gear of the first stage of the speed increasing transmission mechanism also form the duplex gear.
Preferably, the mass of the driven gear, the large gear and the small gear is not more than 1/10 of the mass of the flywheel, respectively.
Preferably, in the third step, when the adjustable inertial container is mounted, an included angle θ between a longitudinal direction of the driving rack and a line of the tubular member satisfies 0 ° < θ+.ltoreq.90°.
Preferably, 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 needing vibration reduction on a power transmission tower is determined, and the vibration direction of the circular tube component is judged;
and step three, 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 inertial container is mounted to the circular tube member arranged horizontally, the driving rack is located in a vertical direction;
for the round pipe component which is vertically or obliquely arranged, if the vibration plane of the round pipe 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 degrees and smaller than 180 degrees.
Compared with the prior art, the invention has the beneficial effects that: the inertial container used by the invention has the advantages of simple structure, low economic cost and convenient use, and the inertial force characteristic of the inertial container is easy to adjust 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 simulation experiments and engineering practices prove that the inertial container can obtain an ideal vibration reduction effect.
Drawings
FIG. 1 is a schematic diagram of an adjustable inertial container for damping vibration of a tubular member of a power transmission tower;
FIG. 2 is a schematic view of the installation of an adjustable inertial container;
FIG. 3 is a schematic view of the structure of an adjustable inertial container;
FIG. 4 is a schematic diagram of a drive rack and flywheel driven by a multi-stage speed increasing gear pair;
FIG. 5 is a graph of the effect of inertial containers of different b values on the breeze vibration amplitude of a tubular member using finite element modeling experiments;
FIG. 6 is a schematic illustration of round bar members on a power transmission tower susceptible to vibration, the round bar members being marked with circles;
fig. 7 is an arrangement of the adjustable inertial container on the transmission tower in fig. 6.
Detailed Description
The invention is further described below with reference to examples and figures.
Example 1
Referring to fig. 2, 3 and 4, an adjustable inertial container a comprises a bracket 1, wherein a flywheel 4 and a rotation driving mechanism 2 are installed on the bracket 1 and are in transmission connection. The rotation driving mechanism 2 is provided with a first connecting end for being connected with the vibrating piece; the bracket 1 is provided with a second connecting end for being connected with a fixing piece. The vibration of the vibrating member is transmitted to the flywheel 4 through the rotation driving mechanism 2 and the speed increasing transmission mechanism to rotate, and the inertia force of the adjustable inertial container A acts on the vibrating member reversely to restrain the vibration.
In order to increase and make adjustable the inertia force of the adjustable inertial container a, a speed increasing transmission mechanism is arranged between the rotation driving mechanism 2 and the flywheel 4, and is detachably mounted 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.
In this embodiment, the speed-increasing transmission mechanism is a gear transmission mechanism and includes at least one speed-increasing gear pair 3, and the speed-increasing gear pair 3 includes a large gear 3a and a small gear 3b that are meshed with each other. In the transmission direction, the large gear 3a of the first stage is driven by the rotation driving mechanism 2, and the small gear 3b of the last stage rotates coaxially with the flywheel 4.
In order to make the adjustable inertial container A compact in structure, the large gear 3a of the speed increasing gear pair 3 of the next stage and the small gear 3b of the speed increasing gear pair 3 of the adjacent previous stage are coaxially arranged to form a duplex gear, and the gear shaft of the duplex gear is rotatably arranged on the bracket 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, where 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 mounted on the bracket 1 and meshed with the driving rack 2a, the driven gear 2b and the large gear 3a of the first stage of the speed increasing transmission mechanism are coaxially arranged, and the driven gear 2b and the large gear 3a of the first stage of the speed increasing transmission mechanism also form a duplex 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 connection plates 1a, all the longitudinal connection plates 1a are arranged in parallel and opposite to each other, two ends of the longitudinal connection plates 1a are respectively provided with a transverse connection plate 1b, and the same end of the longitudinal connection plate 1a is fixedly connected with the corresponding transverse connection 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, a first connecting end of the driving rack 2a freely penetrates out of any transverse connecting plate 1b, and the driving rack 2a is in sliding fit with the two longitudinal connecting plates 1a positioned on two sides of the driving rack 2 a.
The gear shafts of the driven gears 2b, the gear shafts of the duplex gears and the flywheel 4 are transversely arranged on the longitudinal connecting plates 1a, and the speed-increasing gear pairs 3 are arranged in gaps between the longitudinal connecting plates 1a according to meshing relations.
In order to further increase the inertial force, the mass of the driven gear 2b, the gearwheel 3a and the pinion 3b respectively does not exceed 1/10 of the mass of the flywheel 4, which can be designed as hollow gears, for example. This more effectively transmits the vibration of the vibrating member to the flywheel 4, thereby enhancing the responsiveness of the adjustable inertial container a to the vibration.
The formula of the inertia force of the adjustable inertial container is
F＝b(a 1 -a 2 ) (I)，
Wherein b is the characteristic of the inertial container and is related to the number of the duplex gears, the radius ratio of the large gear 3a and the small gear 3b of the duplex gears and the radius ratio of the flywheel 4 and the small gear 3b of the last stage;
a 1 acceleration of the first connection;
a 2 for the acceleration of the second connecting end, when the second connecting end is fixedly connected, a 2 ＝0。
In order to facilitate manufacturing of the inertial container and to facilitate calculation of the inertial force of the inertial container, as shown in fig. 4, each of the duplicate gears is identical, as shown in fig. 4. The double gears between the driving rack 2a and the flywheel 4 are numbered as 1, 2, 3, … … and n in turn according to the transmission direction, and the outer circle radius of the large gear 3a of which k1 is less than or equal to n and is an integer number of double gears is recorded as r k The inner circle radius of the pinion 3b of the kth double gear is denoted pr k ；
The radius of the flywheel 4 is denoted r r The radius of the inner ring of the pinion 3b coaxial with the flywheel 4 is denoted as r pr ；
The mass of the flywheel 4 is denoted m f ；
Then, the characteristic calculation formula of the inertial container is that
From the above analysis, it is known that changing the number of the double gears, or changing the ratio of the radius of the large gear 3a and the small gear 3b of the double gears, or changing the ratio of the radius of the flywheel 4 and the small gear 3b of the last stage, or changing the mass of the flywheel 4, can change the inertial container characteristics, thereby adjusting the inertial force thereof.
Example two
A vibration reduction method for breeze vibration of a circular tube member of a power transmission tower, which uses the adjustable inertial container in the first embodiment, comprises the following steps:
firstly, knowing on-site meteorological information, on-site investigation and determination of a circular tube member 5 on a power transmission tower B, which needs vibration reduction, and judging the vibration direction of the circular tube member 5;
selecting at least one iron tower fixing part 6 close to the circular pipe members 5 on the power transmission tower B for each circular pipe member 5, and installing an adjustable inertial container A between the circular pipe members 5 and the iron tower fixing parts 6;
step three, as shown in fig. 1 and 2, installing an adjustable inertial container 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 inertia acting force of the round tube component 5 on the adjustable inertial container A is that
F’＝b(a 1 -a 2 )sinθ (III)，
Wherein a is 1 The vibration acceleration of the first connecting end, namely the circular tube component;
because the second connecting end is fixedly connected withOn the pylon fixing part 6, thus a 2 ＝0；
Wherein θ is an angle between the longitudinal direction of the driving rack 2a and the center line of the circular tube member 5. In order to play a vibration reduction effect, when the adjustable inertial container A is installed, theta is 0 degrees < theta is less than or equal to 90 degrees. As can be seen from formula (III), θ is preferably 90.
Further, when the drive rack 2a is positioned in the vibration plane of the circular tube member 5, the inertial force of the inertial container can be most effectively transmitted to the circular tube member 5. Therefore, the drive rack 2a should be positioned 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 inertial container a to which the round tube member 5 is subjected can be adjusted to reduce the vibration amplitude of the round tube member 5 to an appropriate range.
For the horizontally arranged circular tube member 5, since stable vertically blowing wind hardly occurs, the driving rack 2a is located in the vertical direction when the adjustable inertial container a is mounted for such a circular tube member 5.
For the vertical or inclined circular tube member 5, because the circular tube member 5 has higher rigidity, the requirement can be met by generally arranging an adjustable inertial container A; if the vibration plane exceeds the length of one or the round tube member 5, two adjustable inertial containers A can be arranged according to the requirement, and the included angle of the driving racks 2a of the two adjustable inertial containers A is larger than 0 degrees and smaller than 180 degrees.
According to the field situation, the fourth step is carried out after the installation of the adjustable inertial container A is completed, and the vibration reduction effect is observed, for example, the vibration amplitude of the round tube component 5 after vibration stabilization is not more than 3mm is used 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: increasing the number of the speed increasing gear pairs 3, or/and changing the large gear 3a and the small gear 3b to increase the radius ratio of the large gear and the small gear, thereby increasing the value of the inertial container characteristic b to increase the inertial force of the adjustable inertial container A.
Example III
And researching the vibration reduction effect of the adjustable inertial container by adopting an ANSYS finite element model. The simulation takes a project of an extra-high voltage alternating current transmission line as a research object, and a round pipe rod piece 5 with a breeze vibration phenomenon frequently occurring in the extra-high voltage alternating current transmission line is selected for research, and the size parameters and constraint conditions are shown in table 1.
TABLE 1 parameter table for round tube component
In the simulation, the relevant parameters of the adjustable inertial container A are shown in table 2. The simulation tests 1 to 3 only change the value of the inertial container characteristic b by changing the mass of the flywheel 4. Under the corresponding conditions, the amplitude of the round tube member 5 is shown in fig. 5. It can be seen that the vibration of the round tube member 5 is stabilized and the amplitude thereof is about 15mm without the inertial container, i.e., with b=0; under the condition of the simulation test 1, the vibration of the circular tube member 5 is stabilized and then the amplitude is about 14mm; under the condition of the simulation test 2, the vibration of the circular tube member 5 is stabilized and then the amplitude is about 6mm; under the condition of the simulation test 3, the vibration amplitude of the circular tube member 5 is reduced to 3mm after the vibration is stabilized. The simulation test shows that the vibration reduction effect can be effectively improved by increasing the value b.
Table 2 simulation test duplex gear and flywheel parameter table
The simulation experiment can be used before step three of the second embodiment. Before the adjustable inertial container A is installed, an ANSYS finite element model is firstly established according to the formula (I) and parameters of the circular tube member 5, the characteristic b value of the inertial container of the adjustable inertial container A capable of damping vibration of the circular tube member 5 is analyzed through the model, 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 inertial container A is designed according to the design, and then the adjustable inertial container A is installed.
In the fourth step, if the vibration reduction effect is insufficient, the number of the duplex gears, the radius ratio of the large gear 3a to the small gear 3b of the duplex gears, the radius ratio of the flywheel 4 to the small gear 3b of the last stage, and the mass of the flywheel 4 can be changed, and the amplitude of the circular tube member 5 is predicted again by means of the ANSYS finite element model, so as to assist in determining how to adjust the structure of the adjustable inertial container 5.
Example IV
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 tower type steel pipe tower is researched and found as SZ30102, SZ30103, SZ30105, SJ30105 and the like: the front side of the tower leg and the inclined material of the V-shaped surface are easy to vibrate at the parts of the horizontal transverse material of the tower leg partition surface, the inclined material of the tower body above the partition surface, and the like, as shown in figure 6. The arrangement scheme is formulated according to the specific situation, as shown in fig. 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 vibration is not easy to occur when the iron tower component encounters wind blowing. Practical use shows that the method can obtain ideal vibration reduction effect.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The vibration reduction method for breeze vibration of the circular tube member of the power transmission tower is characterized by comprising the following steps of:
firstly, on-site investigation and determination of a circular tube member (5) on a power transmission tower (B) which needs vibration reduction;
selecting at least one iron tower fixing part (6) close to the circular pipe members (5) for each circular pipe member (5) on the power transmission tower (B) so as to be used for installing an adjustable inertial container (A) between the circular pipe members (5) and the iron tower fixing parts (6);
the adjustable inertial container (A) comprises a bracket (1), wherein a flywheel (4) and a rotation driving mechanism (2) are arranged on the bracket (1);
a speed-increasing transmission mechanism is arranged between the rotation driving mechanism (2) and the flywheel (4), and 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 rotary 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 inertial container (A): the first connecting end is connected with the circular tube member (5), and the second connecting end is connected with the iron tower fixing part (6) so that the rotary driving mechanism (2) converts vibration of the circular tube member (5) into rotary motion of the flywheel (4) to inhibit the vibration of the circular tube member (5);
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 (3 a) and a small gear (3 b) which are meshed with each other; in the transmission direction, the large gear (3 a) of the first stage is driven by the rotation driving mechanism (2), and the small gear (3 b) of the last stage and the flywheel (4) coaxially rotate; the rotary driving mechanism (2) is a gear rack mechanism and comprises a driving rack (2 a) and a driven gear (2 b), the driven gear (2 b) is rotatably arranged on the bracket (1) and meshed with the driving rack (2 a), and the driven gear (2 b) and a large gear (3 a) of a first stage of the speed-increasing transmission mechanism are coaxially arranged; the masses of the driven gear (2 b), the large gear (3 a) and the small gear (3 b) respectively do not exceed 1/10 of the mass of the flywheel (4).
2. The method for damping breeze vibration of a power transmission tower circular tube member according to claim 1, further comprising the step of observing a 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 breeze vibration of a power transmission tower circular tube member according to claim 2, wherein the method comprises the steps of: in the third step, the pipe sleeve (2 c) is sleeved at the middle part of the circular pipe member (5).
4. A method of damping breeze vibrations of a tubular power transmission tower member according to claim 3, wherein: in the fourth step, the inertial force of the adjustable inertial container (A) is adjusted by increasing or decreasing the number of the speed increasing gear pairs (3) or replacing the large gear (3 a) and the small gear (3 b) to change the radius ratio of the large gear and the small gear.
5. The method for damping breeze vibration of a power transmission tower tubular member according to claim 4, wherein the method comprises the steps of: the driving rack (2 a) is slidably arranged on the bracket (1), and any one end of the driving rack extends out of the bracket (1) to form the first connecting end.
6. The method for damping breeze vibration of a power transmission tower tubular member according to claim 5, wherein the method comprises the steps of: the large gear (3 a) of the next-stage speed-increasing gear pair (3) and the small gear (3 b) of the adjacent previous-stage speed-increasing gear pair (3) are coaxially arranged to form a duplex gear, and a gear shaft of the duplex gear is rotatably arranged on the bracket (1);
the driven gear (2 b) and the large gear (3 a) of the first stage of the speed increasing transmission mechanism also form the duplex gear.
7. The method for damping breeze vibration of a power transmission tower tubular member according to claim 6, wherein the method comprises the steps of: in the third step, when the adjustable inertial container (A) is installed, an included angle theta between the length direction of the driving rack (2 a) and a pipe center line of the circular pipe member (5) meets 0 degrees < theta less than or equal to 90 degrees.
8. The method for damping breeze vibration of a power transmission tower tubular member according to claim 7, wherein: the specific process of the first step is that on-site meteorological information is known, a circular tube component (5) needing vibration reduction on a power transmission tower (B) is investigated on site and determined, and the vibration direction of the circular tube component (5) is judged;
in the third step, when the adjustable inertial container (A) is installed, the driving rack (2 a) is positioned in the vibration plane of the circular tube member (5).
9. The method for damping breeze vibration of a power transmission tower tubular member according to claim 8, wherein the method comprises the steps of: in the third step, when the adjustable inertial container (A) is installed for the round pipe component (5) which is horizontally arranged, the driving rack (2 a) is positioned in the vertical direction;
for the round pipe component (5) which is vertically or obliquely arranged, if the vibration plane exceeds one, two adjustable inertial containers (A) are arranged, and the included angle of the driving racks (2 a) of the two adjustable inertial containers (A) is larger than 0 degrees and smaller than 180 degrees.
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| US20230279917A1 (en) * | 2022-03-03 | 2023-09-07 | General Electric Company | Automatically tunable mass damper |
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