CN113451969A - Optimization method of clamp rotary type double-pendulum anti-galloping device - Google Patents
Optimization method of clamp rotary type double-pendulum anti-galloping device Download PDFInfo
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- CN113451969A CN113451969A CN202110874695.6A CN202110874695A CN113451969A CN 113451969 A CN113451969 A CN 113451969A CN 202110874695 A CN202110874695 A CN 202110874695A CN 113451969 A CN113451969 A CN 113451969A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
- H02G7/125—Damping spacers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/04—Arrangements or devices for relieving mechanical tension
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/14—Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention discloses a wire clamp rotary type double-pendulum anti-galloping device optimization method, which comprises the following steps: (1) only the rotary spacer is installed on the split conductors, the change of ice coating distribution and pneumatic characteristics along the gears is considered, the split conductors which are installed with the rotary spacer in different wire clamp configuration schemes are subjected to galloping response numerical simulation, and the optimal rotary wire clamp configuration scheme is obtained by comparing the line galloping characteristics of different schemes; (2) the double-pendulum anti-galloping device with the optimal rotary wire clamp configuration scheme is additionally arranged on the split conductor, the ice coating distribution along the gear and the change of the pneumatic characteristic are considered, the galloping response numerical simulation is carried out on the split conductor provided with the rotary double-pendulum anti-galloping device with different parameters, and the optimal double-pendulum structural parameters are obtained by comparing the line galloping characteristics under different parameter combination schemes. According to the invention, the optimal scheme of the wire clamp rotary type double-pendulum anti-galloping device suitable for an actual line is found by numerically simulating and installing different wire clamp arrangement schemes and the galloping response of the split conductor of the double-pendulum parameter anti-galloping device and comparing four galloping characteristics.
Description
Technical Field
The invention belongs to the technical field of overhead transmission line protection, and particularly relates to a clamp rotary type double-pendulum anti-galloping device optimization method.
Background
When overhead ultrahigh voltage power transmission is carried out, compared with a single conductor, the split conductor can reduce the inductance and increase the capacitance of a power transmission line, reduce the wave impedance of the power transmission line to alternating current and improve the power transmission capacity of the line, so the split conductor is generally adopted.
The split conductor often waves under the action of wind power, the waves can generate overlarge tension on the conductor, so that the conductor is broken into strands and broken due to fatigue accumulation, and in severe cases, the wave phenomenon can cause mechanical damage to transmission equipment such as iron tower components and insulator strings, and even more, the wave can cause the iron tower to collapse.
Therefore, the problem to be solved urgently is to prevent the galloping of the power transmission line in an effective way.
The wire clamp rotary type double-pendulum anti-galloping device is widely applied to the galloping prevention and control of split conductors, the anti-galloping device is generally used by matching double pendulums and rotary wire clamps, but the configuration scheme and the anti-galloping effect of the anti-galloping device need to be optimized.
The wire clamp rotary double-pendulum anti-galloping device has two structures of a rotary wire clamp and a double pendulum, so that the wire clamp rotary double-pendulum anti-galloping device has the functions of reducing the ice coating unevenness of a wire and separating the twisting frequency and the transverse vibration frequency of the wire. However, how to configure and optimize the parameters of the two structures to achieve the optimal anti-galloping performance suitable for the actual transmission line is still lack of research.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an optimization method of a clamp rotary type double-pendulum anti-galloping device, which comprises clamp optimization and double-pendulum optimization, wherein the optimal scheme of the clamp rotary type double-pendulum anti-galloping device suitable for an actual line is found by installing different clamp arrangement schemes and the galloping response of a split conductor of the double-pendulum parameter anti-galloping device through numerical simulation and comparing four galloping characteristics of typical point displacement time, motion trail, conductor vibration amplitude, conductor tension and the like of the conductor.
The invention adopts the following technical scheme.
A wire clamp rotary type double-pendulum anti-galloping device optimization method comprises the following steps:
(1) only the rotary spacer is installed on the split conductors, the change of ice coating distribution and pneumatic characteristics along the gears is considered, the split conductors which are installed with the rotary spacer in different wire clamp configuration schemes are subjected to galloping response numerical simulation, and the optimal rotary wire clamp configuration scheme is obtained by comparing the line galloping characteristics of different schemes;
(2) the double-pendulum anti-galloping device with the optimal rotary wire clamp configuration scheme is additionally arranged on the split conductor, the ice coating distribution along the gear and the change of the pneumatic characteristic are considered, the galloping response numerical simulation is carried out on the split conductor provided with the rotary double-pendulum anti-galloping device with different parameters, and the optimal double-pendulum structural parameters are obtained by comparing the line galloping characteristics under different parameter combination schemes.
Further, the step (1) specifically includes:
(1.1) configuring rotary spacer schemes with different wire clamp types, quantities and arrangements;
(1.2) carrying out numerical simulation on the ice coating distribution and the pneumatic characteristic change of the sub-conductors releasing the torsional freedom along the gears to obtain typical ice coating section pneumatic parameters;
(1.3) installing rotary spacers with different wire clamp configuration schemes on the split conductors, and performing galloping response numerical simulation on the split conductors provided with the rotary spacers with the different wire clamp configuration schemes by considering ice coating distribution along a gear and pneumatic characteristic change;
(1.4) extracting four waving characteristics of a typical point displacement time course, a motion track, a lead vibration amplitude and lead tension;
and (1.5) comparing conductor galloping characteristics under different wire clamp schemes, evaluating the anti-galloping efficiency of each scheme, and obtaining the optimal rotary wire clamp configuration scheme.
Further, the step (2) specifically includes:
(2.1) determining a parameter value range of a double-pendulum structure, combining and designing double-pendulum structures of different schemes in the parameter range, matching with an optimal rotary wire clamp configuration scheme, and combining to form a wire clamp rotary double-pendulum anti-galloping device which is additionally arranged on the split conductor;
(2.2) considering the ice coating distribution along the gear and the change of the pneumatic characteristic, and carrying out galloping response numerical simulation on the split conductors provided with the wire clamp rotary type double-pendulum anti-galloping device with different parameters;
(2.3) extracting four waving characteristics of a typical point displacement time course, a motion track, a lead vibration amplitude and lead tension;
and (2.4) comparing conductor galloping characteristics under different double-pendulum parameters, evaluating the anti-galloping efficiency of each anti-galloping device, and obtaining the wire clamp rotary type double-pendulum anti-galloping device with the optimal parameters.
Further, in the step (1.2), the twistable sub-conductors are distributed along the ice coating, and the torque M of the ith ice coating isiAnd the resulting wire twist angle thetaiComprises the following steps:
wherein d is the diameter of the wire, b is the thickness of the ice coating, ρiceFor ice coating density, g is acceleration of gravity, beta0Is the angle of freezing, ri-1The radius of the ice-coated pole, p, of the conductor obtained after the overlying layer of ice is superposedbAnd the number of ice coating layers is L, the span of the wire, the torsional rigidity of the wire and the ice coating simulation point of the wire along the block.
Further, in the step (1.2), a typical section model of the split conductor is established according to ice coating distribution of the twistable sub-conductors along the gear, and a flow field model of the twistable sub-conductors is numerically simulated by adopting fluid mechanics software to obtain the pneumatic characteristics of each sub-conductor;
the size of the flow-surrounding field model area is set to be 8m multiplied by 8m, the variation range of the wind attack angle alpha is 0-360 degrees, and calculation is carried out by taking every 5 degrees as a working condition; and for different wind attack angle working conditions, keeping the model and the grid unchanged, and changing the incoming flow direction and the boundary condition.
Further, the incoming flow direction and boundary conditions are set as:
when alpha is 0 degrees, the left boundary is an inlet, the right boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when 0 ° < α <90 °, the left and lower boundaries are inlets, and the right and upper boundaries are outlets;
when alpha is 90 degrees, the lower boundary is an inlet, the upper boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when 90 ° < α <180 °, the right and lower boundaries are inlets, and the left and upper boundaries are outlets;
when alpha is 180 degrees, the right boundary is an inlet, the left boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when 180 ° < α <270 °, the right and upper boundaries are inlets, and the left and lower boundaries are outlets;
when alpha is 270 degrees, the upper boundary is an inlet, the lower boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when 270 ° < α <360 °, the left and upper boundaries are inlets and the right and lower boundaries are outlets.
Further, each sub-conductor has aerodynamic characteristic lift force FLResistance FDAnd the torque M is:
where ρ isairIs the air density, V is the wind speed, alpha is the wind attack angle, CL、CD、CMRespectively a lift coefficient, a drag coefficient,The torque coefficient.
Further, in the step (1.3), the wire is divided into a plurality of segments according to the ice coating distribution of the wire along the rail and the change of the aerodynamic characteristics, the segments apply the section typical section aerodynamic characteristics, and the applied response aerodynamic force is calculated.
Further, in the step (2.1), the weight range of the pendulum bob with the parameters of the double pendulum structure is 5kg-15kg, the length range of the pendulum arm is 200 mm-1000 mm, and the opening angle range is 45-125 degrees.
Further, based on the galloping simulation result of the ABAQUS finite element software, four galloping characteristics of the typical point displacement time range, the motion trail, the wire vibration amplitude and the wire tension of the wire are output.
Compared with the prior art, the invention has the beneficial effects that:
in the optimization process, the ice coating distribution and the pneumatic characteristic change of the sub-conductor connected with the rotary wire clamp, which release the torsional freedom degree, along the gear are considered, the pneumatic load borne by the conductor is reduced by the rotary wire clamp, and the double-pendulum structure has a detuning function and prevents the transverse vibration frequency and the torsional vibration frequency of the conductor from being coupled.
The galloping and anti-galloping simulation shows that the wire clamp rotary type double-pendulum anti-galloping device has a good anti-galloping effect, improves the critical wind speed of galloping by being matched with a rotary spacer, reduces the vibration amplitude and the wire tension of a wire, enhances the anti-galloping capacity of the wire to the maximum, and improves the safety and the stability of a power transmission line.
Drawings
FIG. 1 is a flow chart of a method for optimizing a rotary double-pendulum anti-galloping device of a wire clamp;
FIG. 2 is a schematic view of an eight split rotary spacer for different rotary clamp configurations;
FIG. 3 is a schematic view of the distribution of twistable sub-wires along the rail ice coating shape;
FIG. 4 is a pneumatic characteristic analysis of an iced eight-split conductor connected with a rotary spacer, wherein a is a section model of the iced eight-split conductor, and b is a streaming field calculation model of the iced eight-split conductor;
FIG. 5 is a schematic diagram of a double pendulum configuration;
fig. 6 is a schematic view of a typical wire clamp rotary double pendulum anti-galloping device and rotary spacer mating installation scheme.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in figure 1, the optimization method of the wire clamp rotary type double-pendulum anti-galloping device comprises two steps of optimization, wherein the first step is to optimize the arrangement mode of rotary wire clamps, and the second step is to optimize parameters such as the mass of a double-pendulum bob, the length of a pendulum arm, the opening angle and the like.
The optimized wire clamp rotary type double-pendulum anti-galloping device comprises wire clamp optimization and double-pendulum optimization, wherein the optimal scheme of the wire clamp rotary type double-pendulum anti-galloping device suitable for an actual line is found through two-step optimization by comparing the typical point displacement time, the motion trail, the vibration amplitude of a wire, the tension of the wire and other four galloping characteristics of the split wire of the double-pendulum parameter anti-galloping device installed in different wire clamp arrangement schemes through numerical simulation.
In the first step, considering the distribution of the sub-conductors which are connected with the rotary wire clamps and release the torsional freedom degree along the gear ice coating and the change of the pneumatic characteristic thereof, numerically simulating the galloping response of the split conductors only provided with the rotary spacer, and obtaining the optimal rotary wire clamp configuration scheme by comparing the galloping characteristics of the circuit galloping of different rotary wire clamp configuration schemes.
In the second step, the double-pendulum anti-galloping device of the optimal rotary wire clamp configuration scheme is additionally arranged on the split conductor, the galloping response of the split conductor provided with the wire clamp rotary double-pendulum anti-galloping device is numerically simulated, and the wire clamp rotary double-pendulum anti-galloping device of the optimal pendulum weight, the swing arm length and the opening angle is obtained by comparing the galloping characteristics of line galloping of the wire clamp rotary double-pendulum anti-galloping device under the parameter combination scheme of different pendulum weights, swing arm lengths, opening angles and the like.
The optimal scheme of the wire clamp rotary type double-pendulum anti-galloping device suitable for an actual line is found through two steps, and the anti-galloping capacity, stability and safety of the power transmission line can be improved to the maximum extent.
The method comprises the following specific steps of:
(1) the rotary spacer has different wire clamp configuration forms, and part of the wire clamps can be designed to be freely rotated or rotated within a certain angle range. Generally, N/2 wire clamps can freely rotate in N wire clamps.
In the embodiment of the present invention, an eight-split rotary spacer is taken as an example.
As shown in fig. 2, different rotary wire clamp configurations of the eight-split rotary spacer include a fixed wire clamp (fixed clamp) and a rotary wire clamp (rotation free clamp). Scheme one (Scheme 1) is ordinary eight-split damping spacer, and eight fastener are all fixed, retrains all translation and rotational degrees of freedom, can be used to the anti-galloping efficiency of other fastener configuration schemes of contrast evaluation. Scheme two (Scheme 2) is a rotary spacer with fixed wire clamps and rotary wire clamps arranged at intervals. Scheme three (Scheme 3) is a rotary spacer with four rotary wire clamps arranged on the leeward side in a single-side mode, and the four wire clamps on the windward side are fixed. Scheme four (Scheme 4) is a rotary spacer with rotary wire clamps arranged on the windward side in a single-side mode, and the four wire clamps on the leeward side are fixed.
(2) Carrying out numerical simulation on the ice coating distribution and the pneumatic characteristic change of the sub-conductors which are connected with the rotary wire clamp and release the torsional freedom degree along the gears to establish a model;
due to the fact that the twisting freedom degree of the lead is released, the lead can rotate in the process of icing, and a section with high icing uniformity can be obtained after continuous icing. As shown in fig. 3, the twistable sub-wires are distributed along the rail ice coating shape. Torque M of i-th layer ice coatingiAnd the resulting wire twist angle thetaiComprises the following steps:
wherein d is the diameter of the wire, b is the thickness of the ice coating, ρiceFor ice coating density, g is acceleration of gravity, beta0Is the angle of freezing, ri-1The radius of the ice-coated pole, p, of the conductor obtained after the overlying layer of ice is superposedbAnd the number of ice coating layers is L, the span of the wire, the torsional rigidity of the wire and the ice coating simulation point of the wire along the block.
And after obtaining the twistable sub-conductors and ice-coating distribution along the blocks, establishing a typical section model of the split conductor, and numerically simulating a winding field of the twistable sub-conductors by adopting hydrodynamic software such as Fluent and the like to obtain aerodynamic characteristics such as lift coefficient, resistance coefficient, torque coefficient and the like of each sub-conductor.
As shown in fig. 4, the aerodynamic characteristics of the iced eight-split conductor connected to the rotary spacer are analyzed, where a is a cross-sectional model of the iced eight-split conductor, and b is a streaming field calculation model of the iced eight-split conductor.
To ensure that the boundary stabilizes the incoming flow, the calculation region size is set to 8m × 8 m. The variation range of the wind attack angle alpha is 0-360 degrees, and the wind attack angle alpha is calculated as a working condition every 5 degrees. For simplification, the model and the grid are kept unchanged for different wind attack angle working conditions, and only the incoming flow direction and the boundary condition are changed.
The boundary conditions are set as:
when alpha is 0 degrees, the left boundary is an inlet, the right boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when 0 degrees < alpha <90 degrees, the left boundary and the lower boundary are inlets, and the right boundary and the upper boundary are outlets;
when alpha is equal to 90 degrees, the lower boundary is an inlet, the upper boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when the angle is 90 degrees < alpha <180 degrees, the right boundary and the lower boundary are inlets, and the left boundary and the upper boundary are outlets;
when alpha is 180 degrees, the right boundary is an inlet, the left boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when the angle is 180 degrees < alpha <270 degrees, the right boundary and the upper boundary are inlets, and the left boundary and the lower boundary are outlets;
when alpha is 270 degrees, the upper boundary is an inlet, the lower boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when 270 ° < α <360 °, the left and upper boundaries are inlets, and the right and lower boundaries are outlets.
The calculation adopts a finite volume method, and the solver adopts a standard SIMPLE algorithm of pressure-velocity coupling, and the basic strategy of the algorithm is to solve a momentum equation by using an assumed pressure field to obtain the flux on the boundary point. The turbulence model uses a Spalart-almaras model, which can be applied to the computation regions with poor grid quality, which is the best choice when the turbulence does not need to be computed very accurately, and in addition, the density of the near-wall variables is much smaller than in the k-epsilon model and the k-omega model, which makes the model less sensitive to numerical errors. The solving method is second-Order implicit, the pressure item adopts a Standard format, the momentum item adopts a QUICK format, the modified turbulent viscosity item is Third-Order MUSCL, and the time increment step length is set to be 0.001s so as to ensure the calculation precision.
The reduction of the uneven degree of ice coating and the weakening of the pneumatic load of the lead are the fundamental anti-galloping functions of the rotary wire clamp, and the anti-galloping function of the anti-galloping device provided with the rotary wire clamp cannot be ignored when being evaluated.
(3) Only the rotary spacer is installed on the split conductors, and the waving response numerical simulation is carried out on the split conductors provided with the rotary spacers in different wire clamp configuration schemes by considering the ice coating distribution along the gears and the change of the pneumatic characteristics;
the lifting force F borne by each sub-conductor in the process of waving the split conductorLResistance FDThe aerodynamic force, torque M, etc., is calculated by the following formula:
where ρ isairThe air density, the wind speed and the wind attack angle alpha are shown as the air density, the wind speed and the wind attack angle, namely the included angle between the ice coating direction and the wind direction; cL、CD、CMThe values of the lift coefficient, the drag coefficient and the torque coefficient are related to the ice coating shape, and different sections of the ice coating wire have different aerodynamic characteristicsThe dynamic characteristics are obtained from the previous analysis.
According to the ice coating distribution and the aerodynamic characteristic change characteristics of the lead along the rail, the lead is divided into a plurality of sections, the aerodynamic characteristic of the typical section of the section is applied in the sections, and the aerodynamic force for applying response is calculated, so that the waving response numerical simulation of the split lead provided with the rotary spacer with different wire clamp configuration schemes is realized.
(4) Extracting four waving characteristics of typical point displacement time, motion trail, lead vibration amplitude, lead tension and the like;
based on the galloping simulation results of finite element software such as ABAQUS and the like, four galloping characteristics of a typical point displacement time range, a motion track, a wire vibration amplitude, a wire tension and the like of the wire are output.
(5) And obtaining the optimal rotary wire clamp configuration scheme through comparison.
If the installed rotary spacer has good anti-galloping effect, in a typical point displacement time course and tension time course graph of the lead, the more slowly the lead is waved, the smaller the displacement is, the smaller the tension change is, the smaller the motion range of the typical point in a motion trail graph is, and in addition, the smaller the vibration amplitude of the lead is. And the optimal rotary wire clamp configuration scheme can be obtained by comprehensively evaluating and comparing the four types of waving characteristics of all schemes.
The method comprises the following specific steps of double pendulum optimization:
(1) the double-pendulum anti-galloping device of the optimal rotary wire clamp configuration scheme is additionally arranged on the split conductor, and the double-pendulum structure can be represented by three parameters such as pendulum weight, pendulum arm length and opening angle, and is shown in figure 5. Based on the stability galloping mechanism and the line design requirement, three parameter value ranges are listed. The typical pendulum weight range of the double pendulum structure is 5kg-15kg, the swing arm length range is 200 mm-1000 mm, the open angle range is 45-125 degrees, and the double pendulum structure parameters of different split conductors are obviously different.
The double-pendulum structure of different schemes is designed in a combined manner within a parameter range, and each parameter scheme needs to meet the requirements of a stable galloping mechanism and a line design; the scheme of matching the double-pendulum structure of each parameter scheme with the optimal rotary wire clamp is additionally arranged on the split conductor, as shown in fig. 6, the scheme of matching and installing the typical wire clamp rotary double-pendulum anti-galloping device and the rotary spacer is adopted.
(2) Considering the ice coating distribution along the gear and the change of the pneumatic characteristic, carrying out the waving response numerical simulation on the split conductors provided with the rotary double-pendulum anti-waving devices with different parameters;
(3) outputting four waving characteristics of a typical point displacement time interval, a motion track, a wire vibration amplitude, a wire tension and the like of a wire based on waving simulation results of finite element software such as ABAQUS and the like;
(4) and obtaining the optimal double-pendulum structure parameters by comprehensively evaluating and comparing the four types of waving characteristics of all schemes.
Compared with the prior art, the invention has the beneficial effects that:
in the optimization process, the ice coating distribution and the pneumatic characteristic change of the sub-conductor connected with the rotary wire clamp, which release the torsional freedom degree, along the gear are considered, the pneumatic load borne by the conductor is reduced by the rotary wire clamp, and the double-pendulum structure has a detuning function and prevents the transverse vibration frequency and the torsional vibration frequency of the conductor from being coupled.
The galloping and anti-galloping simulation shows that the wire clamp rotary type double-pendulum anti-galloping device has a good anti-galloping effect, improves the critical wind speed of galloping by being matched with a rotary spacer, reduces the vibration amplitude and the wire tension of a wire, enhances the anti-galloping capacity of the wire to the maximum, and improves the safety and the stability of a power transmission line.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. The method for optimizing the clamp rotary type double-pendulum anti-galloping device is characterized by comprising the following steps of:
(1) only the rotary spacer is installed on the split conductors, the change of ice coating distribution and pneumatic characteristics along the gears is considered, the split conductors which are installed with the rotary spacer in different wire clamp configuration schemes are subjected to galloping response numerical simulation, and the optimal rotary wire clamp configuration scheme is obtained by comparing the line galloping characteristics of different schemes;
(2) the double-pendulum anti-galloping device with the optimal rotary wire clamp configuration scheme is additionally arranged on the split conductor, the ice coating distribution along the gear and the change of the pneumatic characteristic are considered, the galloping response numerical simulation is carried out on the split conductor provided with the rotary double-pendulum anti-galloping device with different parameters, and the optimal double-pendulum structural parameters are obtained by comparing the line galloping characteristics under different parameter combination schemes.
2. The optimization method of the wire clamp rotary type double-pendulum anti-galloping device according to claim 1, wherein the step (1) specifically comprises the following steps:
(1.1) configuring rotary spacer schemes with different wire clamp types, quantities and arrangements;
(1.2) carrying out numerical simulation on the ice coating distribution and the pneumatic characteristic change of the sub-conductors releasing the twisting freedom degree along the gears to obtain the pneumatic characteristic parameters of the typical ice coating section;
(1.3) installing rotary spacers with different wire clamp configuration schemes on the split conductors, and performing galloping response numerical simulation on the split conductors provided with the rotary spacers with the different wire clamp configuration schemes by considering ice coating distribution along a gear and pneumatic characteristic change;
(1.4) extracting four waving characteristics of a typical point displacement time course, a motion track, a lead vibration amplitude and lead tension;
and (1.5) comparing conductor galloping characteristics under different wire clamp schemes, evaluating the anti-galloping efficiency of each scheme, and obtaining the optimal rotary wire clamp configuration scheme.
3. The optimization method of the wire clamp rotary type double-pendulum anti-galloping device according to claim 1, wherein the step (2) specifically comprises the following steps:
(2.1) determining a parameter value range of a double-pendulum structure, combining and designing double-pendulum structures of different schemes in the parameter range, matching with an optimal rotary wire clamp configuration scheme, and combining to form a wire clamp rotary double-pendulum anti-galloping device which is additionally arranged on the split conductor;
(2.2) considering the ice coating distribution along the gear and the change of the pneumatic characteristic, and carrying out galloping response numerical simulation on the split conductors provided with the wire clamp rotary type double-pendulum anti-galloping device with different parameters;
(2.3) extracting four waving characteristics of a typical point displacement time course, a motion track, a lead vibration amplitude and lead tension;
and (2.4) comparing conductor galloping characteristics under different double-pendulum parameters, evaluating the anti-galloping efficiency of each anti-galloping device, and obtaining the wire clamp rotary type double-pendulum anti-galloping device with the optimal parameters.
4. The optimization method of the clamp rotary type double-pendulum anti-galloping device of claim 2, wherein in the step (1.2), the twistable sub-wires are distributed along the step ice coating, and the torque M of the i-th layer ice coating isiAnd the resulting wire twist angle thetaiComprises the following steps:
wherein d is the diameter of the wire, b is the thickness of the ice coating, ρiceFor ice coating density, g is acceleration of gravity, beta0Is the angle of freezing, ri-1The radius of the ice-coated pole, p, of the conductor obtained after the overlying layer of ice is superposedbAnd the number of ice coating layers is L, the span of the wire, the torsional rigidity of the wire and the ice coating simulation point of the wire along the block.
5. The optimization method of the rotary type double-pendulum anti-galloping device of the wire clamp according to claim 4, wherein in the step (1.2), a typical section model of the split conductor is established according to ice coating distribution of twistable sub-conductors along a gear, and a flow field model of the twistable sub-conductors is numerically simulated by adopting a fluid mechanics software to obtain aerodynamic characteristic parameters of each sub-conductor;
the size of the flow-surrounding field model area is set to be 8m multiplied by 8m, the variation range of the wind attack angle alpha is 0-360 degrees, and calculation is carried out by taking every 5 degrees as a working condition; and for different wind attack angle working conditions, keeping the model and the grid unchanged, and changing the incoming flow direction and the boundary condition.
6. The optimization method of the wire clamp rotary type double-pendulum anti-galloping device according to claim 5, wherein the incoming flow direction and the boundary conditions are set as follows:
when alpha is 0 degrees, the left boundary is an inlet, the right boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when 0 ° < α <90 °, the left and lower boundaries are inlets, and the right and upper boundaries are outlets;
when alpha is 90 degrees, the lower boundary is an inlet, the upper boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when 90 ° < α <180 °, the right and lower boundaries are inlets, and the left and upper boundaries are outlets;
when alpha is 180 degrees, the right boundary is an inlet, the left boundary is an outlet, and the upper boundary and the lower boundary are symmetrical boundaries;
when 180 ° < α <270 °, the right and upper boundaries are inlets, and the left and lower boundaries are outlets;
when alpha is 270 degrees, the upper boundary is an inlet, the lower boundary is an outlet, and the left boundary and the right boundary are symmetrical boundaries;
when 270 ° < α <360 °, the left and upper boundaries are inlets and the right and lower boundaries are outlets.
7. The optimization method of the wire clamp rotary type double-pendulum anti-galloping device as claimed in claim 6,
aerodynamic characteristic parameter lift force F of each sub-conductorLResistance FDAnd the torque M is:
where ρ isairIs the air density, V is the wind speed, alpha is the wind attack angle, CL、CD、CMRespectively, a lift coefficient, a drag coefficient and a torque coefficient.
8. The wire clamp rotary type double pendulum anti-galloping device optimization method according to claim 2, wherein in the step (1.3),
the line is divided into a plurality of segments according to the ice coating distribution of the line along the rail and the change of the aerodynamic characteristics, and the aerodynamic force of the applied response is calculated by the segments by applying the section typical section aerodynamic characteristics.
9. The wire clamp rotary type double pendulum anti-galloping method of claim 3, wherein in the step (2.1),
the weight range of the pendulum bob of the double pendulum structure parameter is 5kg-15kg, the length range of the pendulum arm is 200 mm-1000 mm, and the opening angle range is 45-125 degrees.
10. The optimization method of the wire clamp rotary type double pendulum anti-galloping device as claimed in claim 2 or 3,
based on the galloping simulation result of ABAQUS finite element software, four galloping characteristics of the typical point displacement time course, the motion trail, the vibration amplitude of the wire and the tension of the wire are output.
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