A numerical simulation method for suppressing the galloping of ice-covered conductors based on a heavy hammer

Abstract

The present invention discloses a numerical simulation method for suppressing the galloping of ice-covered conductors based on weights. According to the actual line parameters, a weight arrangement scheme is proposed. Based on the ice-covered conductor torsion model, the suppression effect of different weight arrangement schemes on the torsion angle is studied. Based on the modal analysis in ANSYS, the suppression effect of weights on galloping is analyzed. To achieve the above results, the present invention includes the following steps: S1: Conduct static simulation of the torsion of ice-covered conductors; S2: Determine the structural parameters of the weights. Assume that the cross-section of the ice-covered line is a typical crescent shape, with uniform ice covering across the entire span. Use the lumped parameter model to simplify the lumped mass system, combine the device with the entire line, and find the handle length L p and the optimal combination parameters of the hammer head mass M p that satisfy any torsion angle through the optimization equation. S3: As described in S2, the optimal mass calculated by the above optimization model is the total mass of the entire span.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission lines, and particularly to a numerical simulation method for suppressing the galloping of ice-covered conductors based on weights. Background Art

[0002] Galloping is a self-excited vibration of the conductor with low frequency (0.1 - 3 Hz) and large amplitude. Its formation mainly depends on three factors, namely ice coating, wind excitation, and the structure and parameters of the line. The hazards caused by galloping are various. At the lighter level, flashover and tripping occur, and at the severer level, fittings and insulators are damaged, the conductor strands are broken, the conductor is broken, and even the tower collapses, resulting in major power grid accidents.

[0003] Configuring weights on the conductor is an effective method to suppress conductor galloping, and there are two theoretical explanations. First, hanging weights increases the overall mass of the line and raises the critical wind speed value for galloping. Second, hanging weights causes the natural frequency of the overall lateral vibration of the line to decrease, avoiding torsional resonance, which is equivalent to increasing the critical ice-wind value. In the actual ice coating of transmission line conductors, in most cases, ice first appears on the upper side of the windward surface, and the angle with gravity is less than 45°. Generally speaking, the ice coating stiffness refers to the influence on the anti-deformation ability of the conductor system after the conductor is ice-coated. The process of the ice coating changing the stiffness is as follows: Suppose the windward side is on the upper side of the conductor. When subjected to external torsion, the center of gravity of the ice coating will move downward. After the external force is removed, the conductor will be difficult to return to its initial shape, and the overall center of gravity of the conductor and the ice layer will also be difficult to return to its original position. This situation is generally called negative stiffness. Therefore, the stiffness of the ice coating is often regarded as negative.

[0004] Severe ice coating will increase the negative stiffness, reduce the overall torsional stiffness, cause the torsional natural frequency of the conductor to decrease rapidly, while the lateral natural frequency decreases less. When the torsional natural frequency is equal to the lateral vibration natural frequency, torsional self-excited galloping may be excited. If a weight is fixed directly below the conductor, the additional stiffness is positive, increasing the overall torsional stiffness, offsetting the decrease in the torsional natural frequency, thereby enhancing the ability of the conductor to resist the external ice-wind effect load, and further improving the safety margin of the conductor operation.

[0005] Then, according to the mechanism of the weight suppressing galloping, a method for suppressing conductor torsion is proposed, and through the above model, the effect of the weight suppressing method on suppressing the torsion of the ice-covered conductor is studied, so as to reduce the harm of line icing. Therefore, studying conductor ice coating, proposing ice prevention and removal methods, and effectively reducing ice and snow disasters occurring in transmission lines have important significance and engineering application value. Summary of the Invention

[0006] The present invention provides a numerical simulation method for suppressing the galloping of ice-covered conductors with weights. According to the actual line parameters, a weight arrangement scheme is proposed. Based on the ice-covered conductor torsion model, the suppression effect of different weight arrangement schemes on the torsion angle is studied. Based on the modal analysis in ANSYS, the suppression effect of the weights on galloping is analyzed. To achieve the above results, the specific technical solutions adopted by the present invention are as follows:

[0007] S1: Conduct static simulation of the torsion of ice-covered conductors. The main steps of the static simulation of the conductors are as follows:

[0008] 1. Define the physical parameters related to the line, including span, height difference, sag, conductor diameter, etc.;

[0009] 2. Define the material properties of the conductor, including elastic modulus, conductor density, Poisson's ratio;

[0010] 3. Define the element property as Beam188 element. The Beam188 element is a three-dimensional beam element with two nodes, and it has 6 degrees of freedom at each node, which can simulate tension, compression and torsion. Therefore, the Beam188 element is used to simulate the ice-covered conductor of the transmission line.

[0011] 4. Establish key points, create the geometric model of the conductor, perform mesh division, release the torsion and displacement degrees of freedom in the conductor, and apply initial strain, etc.

[0012] 5. After the above steps of the conductor, turn on the large deformation switch, apply gravity, and use the axial force iteration termination condition of the middle element to perform the shape finding of the conductor. Finally, apply the torque of the conductor according to the ice weight and center of gravity obtained by the fluid simulation calculation, and calculate the torsion angle of the conductor.

[0013] S2: Determine the structural parameters of the weight. Assume that the cross-section of the ice-covered line is a typical crescent shape, and the whole span is evenly covered with ice. The lumped parameter model is used to simplify the lumped mass system, so that the device is combined with the whole line. The optimal combination parameters of the hammer handle length L p and the hammer head mass M p that satisfy any torsion angle are found through the optimization equation.

[0014] S3: As described in S2, the optimal quality calculated by the above optimization model is the total quality of the entire span. According to the principle of multi-point weighting, in a span, if heavy objects are arranged at different points within the span, multiple nodes can be formed, which enables the wire system to vibrate at a higher order, reduces the vibration amplitude, and mitigates the harm to the transmission line. Therefore, it is necessary to reasonably select the arrangement method of the weights. According to the weight node segmentation principle, when galloping occurs in a certain span of the wire, the galloping will spread from one span to adjacent spans. Similarly, within the same span, the vibration in the sub-span also triggers the vibration of adjacent sub-spans. If the frequency of the vibration wave transmitted from the adjacent span is close to or even the same as the natural frequency of this span, resonance will occur, exciting strong sub-span oscillations, which is an issue that must be considered in anti-galloping design. Therefore, in order to prevent the occurrence of this resonance, it is necessary to make the natural frequencies of adjacent sub-spans not equal to each other. If all the weights are concentrated in the middle of the span, that is, arranged at the 1 / 2 span position, on the one hand, concentrating such a large mass at one point cannot guarantee the mechanical and electrical strength of the wire itself; on the other hand, even if the midpoint does become a node and no longer moves, it only divides the original span into two half-pitches, and these two half-pitches can still gallop. At the same time, when the height difference between the two suspension points is small, or the height difference is much smaller than the span, due to good symmetry, the natural frequencies of the two half-pitches are also close. In this way, once galloping occurs, they will be coupled to each other through the node, forming strong full-span galloping. Therefore, the formation of even-numbered sub-spans should be avoided in the design of the weight arrangement method. Based on the above analysis, in order to study the effect of the weight on suppressing the torsional and galloping of the ice-covered wire, the following 4 schemes are given for simulation: Scheme 1, arrange 4 weights with equal spacing and equal mass; Scheme 2, arrange 6 weights with equal spacing and equal mass; Scheme 3, arrange 8 weights with equal spacing and equal mass; Scheme 4, arrange 10 weights with equal spacing and equal mass.

[0015] S4: Based on the dynamic ice-covered simulation in S1, add the weight model. Since the effect of the weight on the wire torsion comes from the torque and the pressing weight provided by the weight. Therefore, for the simulation of the torsional of the ice-covered wire with suspended weights, it is only necessary to add the gravity provided by the weight when finding the shape of the wire in the wire torsional simulation in step 5 of S1, and when calculating the torsional angle, calculate the ice load torque and the weight torque together. In the static simulation, the core parameters of the weight are the length of the weight handle and the weight of the weight head. At the same time, considering that the weight can twist with the wire, a large-stiffness beam element BEAM188 with a given length is used to simulate the weight handle, and a MASS21 unit with only mass effect in the plumb direction is fixed at one end to simulate the weight head. The rest of the simulation process remains the same as the wire torsional simulation in S1. The mode is the natural vibration characteristic of the line wire. The modal analysis in the ANSYS software can be used to intercept the relevant natural vibration frequencies to study the effect of the weight on suppressing galloping.

[0016] S5: Determine the influence of the weight on the torsional angle, set the parameters of the line conductors, and calculate the mass of 1070.5 kg / km, elastic modulus of 77 GPa, conductor diameter of 22.4 mm, span of 230 m, height difference of 0 m, and horizontal tension of 31 kN; conduct simulations. Compare and analyze the changes in the torsional angles of the conductors after 10 hours of ice accretion under the above four schemes, and plot the relationship curve between the torsional angle and the position within the span.

[0017] S6: Analyze the suppression effect of the weight on galloping. Based on the Nigol torsional mechanism: for flexible cable structures such as single conductors, the degree of separation between the 3rd-order lateral vibration frequency and the 1st-order torsional vibration frequency can reflect its own galloping suppression ability. And introduce the resonance margin ζ to quantitatively describe the degree of separation between the two frequencies.

[0018] The beneficial effects of the present invention are as follows:

[0019] A numerical simulation method for suppressing the galloping of ice-covered conductors with weights according to the actual line parameters, a weight arrangement scheme is proposed; based on the ice-covered conductor torsion model, the suppression effect of different weight arrangement schemes on the torsional angle is studied, and based on the modal analysis in ANSYS, the suppression effect of the weight on galloping is analyzed;

[0020] The installation of the weight can provide a strong anti-torsion moment for the ice-covered conductor to suppress the torsion of the conductor during the ice accretion process, so that the ice accretion process of the conductor will continue to occur on one side (windward side). As the ice thickness increases, there will be a phenomenon that the ice adhesion moment cannot resist the self-gravity moment of the ice, and the macroscopic manifestation is that the ice layers fall off one by one. Especially under the action of natural wind, this shedding will occur particularly violently, so as to reduce the ice accretion degree of the conductor, reduce the increase of the conductor sag stress, and further improve the safety and stability of the conductor operation. Description of the Drawings

[0021] Figure 1 For the curve clusters of weight parameter optimization under different initial ice accretion angles;

[0022] Figure 2 For the torsional angle distribution curves of different weight arrangement schemes;

[0023] Figure 3 For the line parameter table;

[0024] Figure 4 For the frequency separation under the working conditions.

[0025] Description of the Reference Numerals:

[0026] Figure 1 The degrees represented by the curves in are 5°, 10°, 15°... from top to bottom in sequence.

[0027] Figure 2The solutions represented by the curves in are, from top to bottom, "no weight", "Solution Four (Solution 4)", "Solution Three (Solution 3)", "Solution Two (Solution 2)", and "Solution One (Solution 1)". Detailed implementation manners

[0028] The following describes the detailed implementation manners of the present invention in conjunction with the accompanying drawings and embodiments:

[0029] The following further elaborates on the present invention in conjunction with the specification drawings (tables).

[0030] S1: Conduct static simulation of torsional ice accretion on the conductor. The main steps of the static simulation of the conductor are as follows:

[0031] 1. Define the physical parameters related to the line, including span, height difference, sag, conductor diameter, etc.;

[0032] 2. Define the material properties of the conductor, including elastic modulus, conductor density, Poisson's ratio;

[0033] 3. Define the element property as Beam188 element. The Beam188 element is a three-dimensional beam element with two nodes, and it has 6 degrees of freedom at each node, which can simulate tension, compression, and torsion. Therefore, the Beam188 element is used to simulate the ice-covered conductor for the transmission line.

[0034] 4. Establish key points, create the geometric model of the conductor, perform mesh division, release the torsional and displacement degrees of freedom in the conductor, and apply initial strain, etc.

[0035] 5. After the above steps for the conductor, turn on the large deformation switch, apply gravity, and use the axial force iteration termination condition of the middle element to perform shape finding of the conductor. Finally, apply the ice weight and center of gravity obtained through fluid simulation calculation to the conductor torque, and calculate the torsional angle of the conductor.

[0036] S2: Determine the structural parameters of the weight. Assume that the cross-section of the ice-covered line is a typical crescent shape, with uniform ice accretion across the entire span. Use the lumped parameter model to simplify the lumped mass system and combine the device with the entire line. Then, the ice accretion mass m per unit length of the conductor i is:

[0037]

[0038] In the formula: R is the conductor radius; δ is the ice thickness; ρ is the ice density.

[0039] Then, the equivalent torque generated by the eccentric ice accretion of the crescent shape is:

[0040]

[0041] Where: L is the span; θ0 is the initial ice-encrusted angle (the angle between the line connecting the center of the ice gravity and the center of the wire cross-section and the plumb line before the wire undergoes torsional deformation); θ t is the torsional angle of the wire caused by the eccentric ice-encrusted moment; e0 is the distance between the center of the wire and the center of gravity of the crescent-shaped ice crust, which can be obtained from the following formula:

[0042]

[0043] Therefore, the negative stiffness generated by ice accretion can be expressed as:

[0044]

[0045] The positive stiffness generated by the weight can be calculated according to the following formula:

[0046]

[0047] Where: M p is the mass of the weight hammer head; L p is the length of the hammer handle.

[0048] The equivalent moment of inertia of ice accretion and the weight is:

[0049]

[0050]

[0051] Calculated according to the lumped parameter system, the torsional natural frequency of the system is:

[0052]

[0053] Where: f t is the 1st-order torsional natural frequency of the system; k e is the equivalent torsional stiffness of the entire span of the wire, calculated by formula (9); J e is the equivalent moment of inertia of the wire.

[0054]

[0055] Where: H0 is the tension of the wire; the meanings of other parameters are the same as before.

[0056]

[0057] Where: m is the mass per unit length of the wire; the meanings of other parameters are the same as before.

[0058] Substitute the above parameters into formula (8) to get:

[0059]

[0060] The lateral vibration natural frequency of the system:

[0061]

[0062] Where: f v1 is the 1st - order lateral natural vibration frequency of the system; the meanings of other parameters are the same as before.

[0063] According to the analysis of S1, the design criteria of the counterweight can be described as follows:

[0064] f t = Nf vn (13)

[0065] Where: N is the safety factor, the larger N is, the greater the frequency separation; the value of N is referred to as 1.5; n is the order of the lateral vibration frequency to be protected. Nigol recommends the third - order natural frequency, that is: f t = Nf v3 , but whether f v4 , f v5 and above will not produce higher - order coupling, there is no sufficient theoretical basis at present. At least it can be determined that: compared with low - order coupling, the severity and danger of high - order coupling are smaller.

[0066] In simplified calculations, usually f v3 = 3f v1 . In summary, formula (13) can be written as:

[0067] f t = 1.5f v3 = 4.5f v1 (14)

[0068] Substituting formula (11) and formula (12) into formula (14), we get:

[0069]

[0070] The initial icing angle θ0 (since the torsional angle after hanging the counterweight is generally within 5°, θ t ) is generally ignored, the length of the hammer handle L p and the weight of the hammer head M p are all unknown parameters. It is difficult to directly solve for the parameters. The purpose of optimizing the counterweight parameters is to find the optimal combination of the counterweight parameters L p and M p that can satisfy any initial icing angle, that is: L p and M p are as small as possible. At the same time, from the perspective of the safe and stable operation of the line: the smaller L p , the greater the ground clearance of the conductor, and the higher the electrical safety of the conductor; the smaller M pThe smaller it is, the less the sag stress percentage of the conductor increases, and the higher the mechanical and electrical safety of the conductor. In summary, combined with the relevant theories of optimization analysis in mathematics, the parameters L p and M p of the weight can be reduced to the following optimization model:

[0071]

[0072] In the formula: M p (x), L p (x) are both optimization functions; x is the optimization design variable, that is: the initial icing angle θ0, the length L of the hammer handle p and the weight M of the hammer head p ; s i (x) is the constraint condition. By formula (16), find the minimum combination of the weight parameters (L p , M p ) that can satisfy any torsional angle. According to the appendix Figure 3 , calculate the optimization model by formula (16). Due to the distribution range of the initial icing angle θ0 and installation restrictions in actual engineering, the distribution ranges of the parameters θ0 and L p can be restricted as follows: θ0~[5°, 45°], L p ~[200mm, 1000mm]. Take an initial icing angle every 5° and a hammer handle length L p every 10mm, and the optimization curve of the weight parameters can be obtained, as shown in appendix Figure 1 .

[0073] It can be seen from appendix Figure 1 that: under the constraint of formula (15), the change trend of the weight M of the hammer head p with the length L of the hammer handle p shows the characteristic of first decreasing and then increasing, and the extreme points (the lowest points) are all distributed at L p = 600mm. At the distribution of the extreme points, as the initial icing angle increases, the minimum weight M of the hammer head p gradually decreases. Since each point in the curve cluster is an optimized combination that satisfies formula (16), and our goal is to find the minimum combination of the weight parameters (L p , M p ) that can satisfy any torsional angle, from this we can determine that: the maximum value of the lowest points of all curves, that is, marked in the figure: L p = 600mm, M p = 71.28kg, is the optimal combination.

[0074] S3: As described in S2, the optimal quality calculated by the above optimization model is the total quality of the entire span. According to the principle of multi-point weighting, in a span, if heavy objects are arranged at different points within the span, multiple nodes can be formed, which causes the wire system to vibrate at a higher order, reduces the vibration amplitude, and mitigates the harm to the transmission line. Therefore, it is necessary to reasonably select the arrangement method of the weights. According to the weight node division principle, when galloping occurs in a certain span of the wire, the galloping will spread from one span to adjacent spans. Similarly, within the same span, the vibration in the sub-span also triggers the vibration of adjacent sub-spans. If the frequency of the vibration wave transmitted from the adjacent span is close to or even the same as the natural frequency of this span, resonance will be caused, triggering strong sub-span oscillations, which is a problem that must be considered in anti-galloping design. Therefore, in order to prevent the occurrence of this resonance, it is necessary to make the natural frequencies of adjacent sub-spans not equal to each other. If all the weights are concentrated in the middle of the span, that is, arranged at the 1 / 2 span position, on the one hand, concentrating such a large mass at one point cannot guarantee the mechanical and electrical strength of the wire itself; on the other hand, even if the midpoint does become a node and no longer moves, it only divides the original span into two half-pitches, and these two half-pitches can still gallop. At the same time, when the height difference between the two suspension points is small, or the height difference is much smaller than the span, due to good symmetry, the natural frequencies of the two half-pitches are also close. In this way, once galloping occurs, they will be coupled to each other through the node, forming strong full-span galloping. Therefore, the formation of even-numbered sub-spans should be avoided in the design of the weight arrangement method. Based on the above analysis, in order to study the effect of the weight on suppressing the torsional and galloping of the ice-covered wire, the following 4 schemes are given for simulation: Scheme 1, arrange 4 weights at equal intervals and with equal mass; Scheme 2, arrange 6 weights at equal intervals and with equal mass; Scheme 3, arrange 8 weights at equal intervals and with equal mass; Scheme 4, arrange 10 weights at equal intervals and with equal mass.

[0075] S4: Based on the dynamic ice-covering simulation in S1, add the weight model. Since the effect of the weight on the wire torsion comes from the torque and the dead weight provided by the weight. Therefore, for the ice-covering torsion simulation of the wire with weights suspended, only the gravity provided by the weights needs to be added when finding the shape of the wire in Step 5 of the wire ice-covering torsion simulation in S1, and when calculating the torsion angle, the ice load torque and the weight torque are calculated together. In the static simulation, the core parameters of the weight are the length of the weight handle and the weight of the weight head. At the same time, considering that the weight can twist with the wire, a large-stiffness beam element BEAM188 with a given length is used to simulate the weight handle, and a MASS21 element with mass effect only in the plumb direction is fixed at one end to simulate the weight head. The rest of the simulation process remains the same as the wire ice-covering torsion simulation in S1. The mode is the natural vibration characteristic of the line wire. The modal analysis in the ANSYS software can be used to intercept the relevant natural vibration frequencies to study the effect of the weight on suppressing galloping.

[0076] S5: Determine the influence of the weight on the torsional angle, set the parameters of the line conductors, and calculate the mass of 1070.5 kg / km, elastic modulus of 77 GPa, conductor diameter of 22.4 mm, span of 230 m, height difference of 0 m, and horizontal tension of 31 kN; conduct simulations. Compare and analyze the changes in the torsional angles of the conductors after 10 hours of icing under the four schemes in S3, and plot the relationship curve between the torsional angle and the position within the span, as shown in the appendix Figure 2 as follows.

[0077] In the appendix Figure 2 , the maximum torsional angle of the conductor without the weight hanging is 36.83°, and the maximum torsional angles of Schemes 1 - 4 are 3.5°, 3.83°, 4.33°, and 4.82° respectively. It can be seen that the effect of the weight in suppressing the torsional of the conductor is very obvious. And there are depression points at the positions where the weights are hung, indicating that the action of the anti - torsional moment provided by the weights effectively restricts the torsional moment of eccentric icing. The installation of the weights can provide a strong anti - torsional moment for the iced conductors to suppress the torsion of the conductors during the icing process, so that the icing of the conductors will continue to occur on one side (windward side). As the thickness of the ice increases, there will be a phenomenon that the adhesion moment of the ice cannot resist the gravity moment of the ice itself. Macroscopically, it is manifested as the ice shedding layer by layer. Especially under the action of natural wind, this shedding will occur particularly violently, so as to reduce the ice thickness on the conductors, reduce the increase in the sag stress of the conductors, and thus improve the safety and stability of the conductor operation.

[0078] S6: Analyze the effect of the weight in suppressing galloping, based on the Nigol torsional mechanism: for flexible cable structures such as single conductors, the degree of separation between the 3rd - order lateral vibration frequency and the 1st - order torsional vibration frequency can reflect its own galloping suppression ability. And the resonance margin ζ is introduced to quantitatively describe the degree of separation between the two frequencies.

[0079] ζ = f t / f v3 (17)

[0080] According to the conductor parameters in the appendix Figure 3 , conduct modal analysis on the iced conductors, and the appendix Figure 4 can be obtained.

[0081] In the appendix Figure 4 , Scheme N is the control group where no weight is installed on the conductor, and Schemes 1 - 4 are the experimental groups with weights. It can be found that the difference in the 1st - order torsional vibration frequency between the schemes with weights and without weights is relatively large, and the increase in the 3rd - order lateral vibration frequency is relatively small; the overall resonance margins under the four schemes are increased from 3.0029 to 4.4763, 4.4192, 4.3792, and 4.3652 respectively, with increases of 49.06%, 47.16%, 45.83%, and 45.37%.

[0082] Among these four heavy hammer arrangement schemes, the anti-galloping ability of the ice-covered line can be effectively improved. The main reason lies in the improvement of the overall torsional stiffness of the ice-covered conductor by the heavy hammer. On the one hand, it indirectly affects the third-order lateral vibration frequency and slightly increases it; on the other hand, while offsetting the decrease in the torsional vibration natural frequency caused by icing, it greatly improves the first-order torsional vibration frequency, thus realizing the separation of the two frequencies, which is consistent with the theoretical analysis of the anti-torsion and anti-galloping mechanism of the heavy hammer.

[0083] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. These changes involve related technologies well-known to those skilled in the art, and all of them fall within the protection scope of the present invention patent.

[0084] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A numerical simulation method for suppressing the galloping of ice-covered conductors based on a heavy hammer, characterized in that, It includes the following steps: S1: Conduct static simulation of torsional icing on conductors; S2: Determine the structural parameters of the weight. Assume that the cross-section of the ice-covered line is a typical crescent shape, with uniform ice covering the entire span. Use the lumped parameter model to simplify the lumped mass system, combine the device with the entire line, and find the length of the hammer handle that satisfies any torsional angle through the optimization equation L p and the mass of the hammer head M p for the optimal combination parameters; S3: As described in step S2, the optimal mass calculated by the above optimization model is the total mass of the entire span. According to the principle of multi-point weight addition, in a span, if heavy objects are arranged at different points within the span, multiple nodes can be formed, which enables the wire system to vibrate at a higher order, reduces the vibration amplitude, and mitigates the harm to the transmission line. Therefore, it is necessary to reasonably select the arrangement method of the weights. To study the effect of weights on torsional icing and galloping suppression of conductors, the following 4 scenarios are given for simulation: Scenario 1: Arrange 4 weights with equal spacing and equal mass; Scenario 2: Arrange 6 weights with equal spacing and equal mass; Scenario 3: Arrange 8 weights with equal spacing and equal mass; Scenario 4: Arrange 10 weights with equal spacing and equal mass; S4: Based on the dynamic icing simulation in step S1, add the weight model; S5: Determine the influence of the weight on the torsional angle, set the conductor parameters of the line, compare and analyze the change in the torsional angle of the conductor after 10 hours of icing under the four scenarios described in step S4, and plot the relationship curve between the torsional angle and the position within the span; S6: Analyze the suppression effect of the weight on galloping, based on the Nigol torsional mechanism: for flexible cable structures such as single conductors, the separation degree between the 3rd-order lateral vibration frequency and the 1st-order torsional vibration frequency can reflect its own galloping suppression ability; and introduce the resonance margin ζ Quantitatively describe the separation degree between the two frequencies; The above static simulation steps of the conductor include: (1) Define the physical parameters related to the line, including span, height difference, sag, and conductor diameter; (2) Define the material properties of the conductor, including elastic modulus, conductor density, and Poisson's ratio; (3) Define the element property as Beam188 element. The Beam188 element is a three-dimensional beam element with two nodes, and it has 6 degrees of freedom at each node, capable of simulating tension, compression, and torsion; The transmission conductor uses the Beam188 element to simulate the ice-covered conductor; (4) Establish key points, create the conductor geometric model, perform mesh division, release the torsional and displacement degrees of freedom in the conductor, and apply initial strain; (5) After the above steps of the conductor, turn on the large deformation switch, apply gravity, and use the axial force iteration termination condition of the middle element to perform conductor shape finding; finally, apply the ice weight and center of gravity obtained from the fluid simulation calculation, apply the conductor torque, and calculate the conductor torsional angle.

2. A numerical simulation method for suppressing galloping of ice-covered conductors based on a heavy hammer according to claim 1, characterized in that: In step S4, since the effect of the weight on the conductor torsion comes from the torque and dead weight provided by the weight; therefore, for the torsional icing simulation of the conductor with a suspended weight, only the gravity provided by the weight needs to be added during the conductor shape finding in step (5) of the conductor torsional icing simulation in step S1, and when calculating the torsional angle, the ice load torque and the weight torque are calculated together. In the static simulation, the core parameters of the weight are the length of the weight handle and the weight of the weight head. At the same time, considering that the weight can twist with the conductor, a large stiffness beam element BEAM188 with a given length is used to simulate the weight handle, and a MASS21 element with mass effect only in the plumb direction is fixed at one end to simulate the weight head; the rest of the simulation process remains the same as the conductor torsional icing simulation in step S1; the mode is the inherent vibration characteristic of the line conductor. Use modal analysis in ANSYS software to intercept the relevant natural vibration frequencies to study the galloping suppression effect of the weight.

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