Shock-proof hammer steel strand bending rigidity optimization method and system based on impact calculation

Abstract

The invention provides a damper steel strand bending rigidity optimization method and system based on impact calculation. The damper steel strand bending rigidity optimization method comprises the steps that impact calculation is carried out based on structural design parameters and impact loads of a damper and a pre-constructed bilinear isotropic strengthening model to obtain a rotation angle of a damper steel strand; optimizing based on the structural design parameters and the rotation angle of the damper and a steel strand structure optimization model to obtain structural optimization parameters, wherein the steel strand structure optimization model comprises constraint conditions set based on various parameters before and after the damper is impacted; a constraint condition given by the steel strand structure optimization model can ensure that the anti-vibration effect of the damper is not reduced when the bending rigidity of the steel strand of the damper is optimized under a large impact load; and the bilinear isotropic strengthening model is measured in advance before impact calculation, that is, a corresponding parameter range is given, so that the corner obtained by impact calculation is more accurate, and a data basis is provided for researching optimization of the bending rigidity of the steel strand.

Description

Technical Field

[0001] The invention relates to the technical field of power grid disaster prevention, and in particular to a method and system for optimizing the bending stiffness of a vibration-proof hammer steel strand based on impact calculation. Background Art

[0002] The anti-vibration hammer is one of the main components for anti-vibration of transmission lines and is currently the most widely used anti-vibration device in transmission line projects. The existing anti-vibration hammer bending stiffness design is designed to meet the anti-vibration performance of the anti-vibration hammer under breeze vibration conditions. By optimizing the structural parameters of the anti-vibration hammer, the dynamic response of the transmission line under breeze vibration conditions can be effectively reduced.

[0003] However, the existing anti-vibration hammer structural parameter design, especially the bending stiffness value of the anti-vibration hammer steel strand, is designed to reduce the dynamic response of the transmission line under breeze vibration conditions, and can only meet the anti-vibration requirements of the transmission line under breeze vibration conditions.

[0004] At present, there is no relevant research on the bending stiffness of the anti-vibration hammer steel strand under large impact loads. When the transmission line is subjected to a large impact of strong wind, the anti-vibration hammer steel strand of the anti-vibration hammer will undergo significant plastic deformation due to insufficient bending stiffness, affecting its vibration reduction effect. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a method for optimizing the bending stiffness of a vibration-proof hammer steel strand based on impact calculation, comprising:

[0006] Based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-built bilinear isotropic strengthening model of the anti-vibration hammer steel strand, the anti-vibration hammer finite element model is used to perform impact calculation to obtain the rotation angle of the anti-vibration hammer steel strand;

[0007] Based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, the structural optimization parameters of the anti-vibration hammer steel strand are calculated using a steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on various parameter values ​​before and after the anti-vibration hammer is impacted;

[0008] The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

[0009] Optionally, the process of constructing the bilinear isotropic strengthening model of the anti-vibration hammer steel strand includes:

[0010] Based on the tensile test of the anti-vibration hammer steel strand, the nominal yield strength, yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand of corresponding specifications are repeatedly measured;

[0011] The elastic modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress and yield strain measured each time, and the tangent modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time;

[0012] Based on the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand measured each time, the value ranges of the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand of the corresponding specification are fitted;

[0013] A bilinear isotropic strengthening model of anti-vibration hammer steel strand is established based on the range of nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand.

[0014] Optionally, the nominal yield strength of the anti-vibration hammer steel strand is in the range of 1220 MPa to 1475 MPa;

[0015] The elastic modulus of the anti-vibration hammer steel strand is in the range of 1.95×10 5 MPa~2.0×10 5 MPa;

[0016] The tangent modulus of the anti-vibration hammer steel strand is in the range of 1.4×10 5 MPa~1.6×10 5 MPa.

[0017] The anti-vibration hammer steel strand rotation angle is obtained by using the anti-vibration hammer finite element model to perform impact calculation based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-constructed bilinear isotropic strengthening model of the anti-vibration hammer steel strand, including:

[0018] The bending stiffness of the anti-vibration hammer steel strand is obtained by using the single-strand diameter and the number of strands of the anti-vibration hammer steel strand in the structural design parameters of the anti-vibration hammer and the elastic modulus of the anti-vibration hammer steel strand in the pre-constructed bilinear isotropic strengthening model, combined with the bending stiffness calculation formula;

[0019] Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, the impact load, the bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand.

[0020] Optionally, the structural optimization parameters of the anti-vibration hammer steel strand include the elastic modulus and single strand diameter of the anti-vibration hammer steel strand.

[0021] Optionally, the construction of the steel strand structure optimization model includes:

[0022] Based on the number of strands of the anti-vibration hammer steel strand, the diameter of a single strand and the elastic modulus in the bilinear isotropic hardening model, an objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand.

[0023] Setting constraint conditions for the objective function to form a steel strand structure optimization model;

[0024] The constraint conditions include one or more of the following: a rotation angle ratio constraint when the vibration-proof hammer steel strand is impacted and when it reaches yield stress, a natural frequency ratio constraint before and after the impact, and a power ratio constraint before and after the impact.

[0025] Optionally, the objective function is:

[0026] minE q {f(X)}=E q (TπX 1 X 2 4 )

[0027] Among them, E q represents the mathematical expectation value, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand; X 1 Indicates the elastic modulus of the anti-vibration hammer steel strand; X 2 Indicates the single strand diameter of the anti-vibration hammer steel strand.

[0028] Optionally, the calculation formula for the rotation angle ratio constraint when the anti-vibration hammer steel strand is impacted and reaches the yield stress is:

[0029]

[0030] Among them, S 1 represents the ratio of the rotation angle of the anti-vibration hammer steel strand obtained by impact calculation to the rotation angle at yield stress; θ represents the rotation angle of the anti-vibration hammer steel strand obtained after impact calculation; θ y Indicates the rotation angle of the anti-vibration hammer steel strand at yield stress; K 1 For S 1 limit.

[0031] Optionally, the calculation formula for the natural frequency ratio constraint of the anti-vibration hammer steel strand before and after the impact is:

[0032]

[0033] Among them, S 2 It indicates the ratio of the absolute value of the natural frequency difference before and after the vibration damper is subjected to the impact load to the absolute value of the natural frequency before the impact load; f a Indicates the natural frequency of the anti-vibration hammer before it is subjected to impact load; f bIndicates the natural frequency of the anti-vibration hammer after being subjected to impact load; K 2 For S 2 limit.

[0034] Optionally, the calculation formula for the power ratio constraint of the anti-vibration hammer steel strand before and after the impact is:

[0035]

[0036] Among them, S 3 It indicates the ratio of the absolute value of the power difference before and after the anti-vibration hammer is subjected to the impact load to the absolute value of the power before the impact load; P a Indicates the power of the anti-vibration hammer before it is subjected to impact load; P b Indicates the power of the anti-vibration hammer after being subjected to impact load; K 3 For S 3 limit.

[0037] Optionally, the impact load of the anti-vibration hammer is obtained according to the following method:

[0038] Based on the initial configuration, structural design parameters and ice load of overhead transmission lines, the finite element model of overhead transmission lines is used to calculate ice shedding jump, and the maximum amplitude and circular vibration frequency of overhead transmission lines are obtained.

[0039] The impact load on the anti-vibration hammer connected to the overhead power transmission line is calculated using the maximum amplitude and circular vibration frequency of the overhead power transmission line.

[0040] Based on the same inventive concept, the present invention also provides an anti-vibration hammer steel strand bending stiffness optimization system based on impact calculation, comprising:

[0041] Impact calculation module: It is used to calculate the rotation angle of the anti-vibration hammer steel strand by using the anti-vibration hammer finite element model based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-built bilinear isotropic strengthening model of the anti-vibration hammer steel strand;

[0042] Structural optimization module: used to calculate the structural optimization parameters of the anti-vibration hammer steel strand based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, and using the steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on the values ​​of various parameters before and after the anti-vibration hammer is impacted;

[0043] The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

[0044] Optionally, in the impact calculation module, the process of constructing a bilinear isotropic strengthening model of the vibration-proof hammer steel strand includes:

[0045] Based on the tensile test of the anti-vibration hammer steel strand, the nominal yield strength, yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand of corresponding specifications are repeatedly measured;

[0046] The elastic modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress and yield strain measured each time, and the tangent modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time;

[0047] Based on the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand measured each time, the value ranges of the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand of the corresponding specification are fitted;

[0048] A bilinear isotropic strengthening model of anti-vibration hammer steel strand is established based on the range of nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand.

[0049] Optionally, the impact calculation module is specifically used to:

[0050] The bending stiffness of the anti-vibration hammer steel strand is obtained by using the single-strand diameter and the number of strands of the anti-vibration hammer steel strand in the structural design parameters of the anti-vibration hammer and the elastic modulus of the anti-vibration hammer steel strand in the pre-constructed bilinear isotropic strengthening model, combined with the bending stiffness calculation formula;

[0051] Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, the impact load, the bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand.

[0052] Optionally, in the structural optimization module, the structural optimization parameters of the anti-vibration hammer steel strand include the elastic modulus and single strand diameter of the anti-vibration hammer steel strand.

[0053] Optionally, the construction of the steel strand structure optimization model in the structure optimization module includes:

[0054] Based on the number of strands of the anti-vibration hammer steel strand, the diameter of a single strand and the elastic modulus in the bilinear isotropic hardening model, an objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand.

[0055] Setting constraint conditions for the objective function to form a steel strand structure optimization model;

[0056] The constraint conditions include one or more of the following: a rotation angle ratio constraint when the vibration-proof hammer steel strand is impacted and when it reaches yield stress, a natural frequency ratio constraint before and after the impact, and a power ratio constraint before and after the impact.

[0057] Optionally, the objective function in the structure optimization module is:

[0058] minE q {f(X)}=E q (TπX 1 X 2 4 )

[0059] Among them, E q represents the mathematical expectation value, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand; X 1 Indicates the elastic modulus of the anti-vibration hammer steel strand; X 2 Indicates the single strand diameter of the anti-vibration hammer steel strand.

[0060] Optionally, the calculation formula for the rotation angle ratio constraint when the anti-vibration hammer steel strand is impacted and reaches the yield stress in the structural optimization module is:

[0061]

[0062] Among them, S 1 represents the ratio of the rotation angle of the anti-vibration hammer steel strand obtained by impact calculation to the rotation angle at yield stress; θ represents the rotation angle of the anti-vibration hammer steel strand obtained after impact calculation; θ y Indicates the rotation angle of the anti-vibration hammer steel strand at yield stress; K 1 For S 1 limit.

[0063] Optionally, the calculation formula for the natural frequency ratio constraint of the anti-vibration hammer steel strand before and after the impact in the structural optimization module is:

[0064]

[0065] Among them, S 2 It indicates the ratio of the absolute value of the natural frequency difference before and after the vibration damper is subjected to the impact load to the absolute value of the natural frequency before the impact load; f a Indicates the natural frequency of the anti-vibration hammer before it is subjected to impact load; f b Indicates the natural frequency of the anti-vibration hammer after being subjected to impact load; K 2 For S 2 limit.

[0066] Optionally, the calculation formula for the power ratio constraint of the anti-vibration hammer steel strand before and after the impact in the structural optimization module is:

[0067]

[0068] Among them, S 3It indicates the ratio of the absolute value of the power difference before and after the anti-vibration hammer is subjected to the impact load to the absolute value of the power before the impact load; P a Indicates the power of the anti-vibration hammer before it is subjected to impact load; P b Indicates the power of the anti-vibration hammer after being subjected to impact load; K 3 For S 3 limit.

[0069] Optionally, in the impact calculation module, the impact load of the anti-vibration hammer is obtained according to the following method:

[0070] Based on the initial configuration, structural design parameters and ice load of overhead transmission lines, the finite element model of overhead transmission lines is used to calculate ice shedding jump, and the maximum amplitude and circular vibration frequency of overhead transmission lines are obtained.

[0071] The impact load on the anti-vibration hammer connected to the overhead power transmission line is calculated using the maximum amplitude and circular vibration frequency of the overhead power transmission line.

[0072] Based on the same inventive concept, the present invention also provides a computer device, including: one or more processors;

[0073] A memory for storing one or more programs;

[0074] When the one or more programs are executed by the one or more processors, the aforementioned method for optimizing the bending stiffness of anti-vibration hammer steel strands based on impact calculation is implemented.

[0075] Based on the same inventive concept, the present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the aforementioned method for optimizing the bending stiffness of anti-vibration hammer steel strands based on impact calculation is implemented.

[0076] Compared with the closest prior art, the present invention has the following beneficial effects:

[0077] The present invention provides a method and system for optimizing the bending stiffness of a vibration-proof hammer steel strand based on impact calculation. Based on the structural design parameters of the vibration-proof hammer, the impact load and a pre-constructed bilinear isotropic strengthening model of the vibration-proof hammer steel strand, a vibration-proof hammer finite element model is used to perform impact calculation to obtain the rotation angle of the vibration-proof hammer steel strand; based on the structural design parameters of the vibration-proof hammer and the rotation angle of the vibration-proof hammer steel strand, the steel strand structure optimization model is used to perform calculation to obtain the structural optimization parameters of the vibration-proof hammer steel strand, and the steel strand structure optimization model includes constraint conditions set based on the values ​​of various parameters before and after the vibration-proof hammer is impacted; the bilinear isotropic strengthening model of the vibration-proof hammer steel strand is based on the yield stress, The yield strain, ultimate tensile stress and ultimate tensile strain are measured and then constructed; when performing impact calculation, the present invention pre-determines the bilinear isotropic strengthening model of the anti-vibration hammer steel strand, and substitutes it into the anti-vibration hammer finite element for impact calculation, which can make the calculated rotation angle more accurate, and the finite element analysis can be used to obtain the rotation angle of the anti-vibration hammer steel strand under different impact loads, which lays a solid foundation for studying the optimization of the bending stiffness of the anti-vibration hammer steel strand and provides calculation data; when optimizing the bending stiffness, constraint conditions are given in the steel strand structure optimization model, which can optimize the bending stiffness of the anti-vibration hammer steel strand under large impact loads while not reducing the anti-vibration effect of the anti-vibration hammer under large impact loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 A schematic flow chart of a method for optimizing the bending stiffness of a vibration-proof hammer steel strand based on impact calculation provided by the present invention;

[0079] Figure 2 It is a bilinear isotropic strengthening model for the vibration-proof hammer steel strand material;

[0080] Figure 3 It is a schematic diagram of the specific calculation process for vibration-proof hammer impact calculation;

[0081] Figure 4 It is a schematic diagram of the finite element model of the anti-vibration hammer;

[0082] Figure 5 Schematic diagram of the vibration input boundary in the finite element model of the vibration damper;

[0083] Figure 6 Schematic diagram of the deformation of the anti-vibration hammer after impact calculation;

[0084] Figure 7 It is the amplitude curve diagram of the hammer heads at the left and right ends of the anti-vibration hammer under the impact load;

[0085] Figure 8 is the relationship between the boundary amplitude of the impact load and the slope of the rotation angle of the anti-vibration hammer steel strand;

[0086] Fig. 9A schematic diagram of the specific process of optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation;

[0087] Fig.10 This is a schematic diagram of the structure of the anti-vibration hammer steel strand bending stiffness optimization system based on impact calculation. DETAILED DESCRIPTION

[0088] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0089] Example 1

[0090] The present invention provides a method for optimizing the bending stiffness of a vibration-proof hammer steel strand based on impact calculation, such as Figure 1 As shown, including:

[0091] S1. Based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-constructed bilinear isotropic strengthening model of the anti-vibration hammer steel strand, the anti-vibration hammer finite element model is used to perform impact calculation to obtain the rotation angle of the anti-vibration hammer steel strand;

[0092] S2. Based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, the structural optimization parameters of the anti-vibration hammer steel strand are calculated using a steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on various parameter values ​​before and after the anti-vibration hammer is impacted;

[0093] The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

[0094] In step S1, S1-1, the process of constructing the bilinear isotropic strengthening model of the vibration-proof hammer steel strand includes:

[0095] Based on the tensile test of the anti-vibration hammer steel strand, the nominal yield strength, yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand of corresponding specifications are repeatedly measured;

[0096] The elastic modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress and yield strain measured each time, and the tangent modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time;

[0097] Based on the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand measured each time, the value ranges of the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand of the corresponding specification are fitted;

[0098] A bilinear isotropic strengthening model of anti-vibration hammer steel strand is established based on the range of nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand.

[0099] Specifically, a tensile test is performed on the anti-vibration hammer steel strand to obtain a bilinear isotropic strengthening model of the anti-vibration hammer steel strand. The bilinear isotropic strengthening model is used to represent the constitutive relationship of the anti-vibration hammer steel strand material, such as Figure 2 As shown, Figure 2 The stress on the vertical axis represents the stress of the anti-vibration hammer steel strand, and the strain on the horizontal axis represents the strain of the anti-vibration hammer steel strand. The first straight line in the bilinear isotropic strengthening model is used to characterize the elastic characteristics of the anti-vibration hammer steel strand, and the elastic modulus E is the slope of the first straight line; the second straight line is used to characterize the plastic characteristics of the anti-vibration hammer steel strand, and the tangent modulus ET is the slope of the second straight line; the calculation formula for the elastic modulus of the anti-vibration hammer steel strand material in the bilinear isotropic strengthening model is:

[0100]

[0101] Where, E represents the elastic modulus of the anti-vibration hammer steel strand material; σ y Indicates the yield stress of the anti-vibration hammer steel strand; ε y It represents the yield strain of the anti-vibration hammer steel strand.

[0102] The calculation formula of the tangent modulus of the anti-vibration hammer steel strand material in the bilinear isotropic strengthening model is:

[0103]

[0104] Among them, E T Represents the tangent modulus of the anti-vibration hammer steel strand material; σ y Indicates the yield stress of the anti-vibration hammer steel strand; ε y represents the yield strain of the anti-vibration hammer steel strand; σ lim Indicates the ultimate tensile stress of the anti-vibration hammer steel strand; ε lim It represents the ultimate tensile strain of the anti-vibration hammer steel strand.

[0105] Since there is no obvious yield point in the tensile curve of the tensile test, the nominal yield strength of the anti-vibration hammer steel strand is obtained by taking 0.95 of the tensile strength. In this embodiment, after multiple tensile tests, based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time, the tangent modulus of the anti-vibration hammer steel strand measured each time is calculated, and the nominal yield strength of the anti-vibration hammer steel strand is determined; there are certain differences in the yield strength of anti-vibration hammer steel strands from different batches, different locations and different times. Therefore, for anti-vibration hammer steel strands of the same specification, their yield strength is Yield strength is not a fixed value, but has a certain range of variation. The nominal yield strength is within a probability interval. Similarly, the elastic modulus and tangent modulus are also within a probability interval. Among them, the nominal yield strength of the anti-vibration hammer steel strand ranges from (1220MPa to 1475MPa); the elastic modulus of the anti-vibration hammer steel strand ranges from (1.95×105MPa to 2.0×105MPa), and the tangent modulus of the anti-vibration hammer steel strand ranges from (1.4×105MPa to 1.6×105MPa).

[0106] Based on the elastic modulus calculated from the yield stress and yield strain of the anti-vibration hammer steel strand measured each time, and the tangent modulus calculated from the measured yield stress, yield strain, ultimate tensile stress and ultimate tensile strain, a corresponding bilinear isotropic strengthening model is constructed, that is, the bilinear isotropic strengthening model includes the elastic modulus and tangent modulus of the steel strand, and the value ranges of the elastic modulus and tangent modulus are obtained by performing multiple tensile tests on the anti-vibration hammer steel strand, that is, the value ranges of the two parameters (elastic modulus and tangent modulus) in the bilinear isotropic strengthening model are obtained.

[0107] During the vibration of the anti-vibration hammer steel strand, the friction resistance between the single wires of the anti-vibration hammer steel strand consumes significant energy. After comprehensive consideration, the damping ratio of the material is selected as (0.01~0.1), and the Rayleigh damping model is used to consider the motion damping.

[0108] The constitutive relationship of the anti-vibration hammer steel strand material, namely the bilinear isotropic strengthening model of the anti-vibration hammer steel strand, is determined in advance through tensile tests. The experimental measurement can accurately obtain the value range of the elastic modulus and tangent modulus of the anti-vibration hammer steel strand in the constitutive relationship, thereby making the rotation angle obtained by the impact calculation more accurate; thus laying the foundation for analyzing the stress and deformation of the anti-vibration hammer steel strand under impact load.

[0109] like Figure 3 As shown in the figure, it is a schematic diagram of the specific calculation process of the vibration-proof hammer impact calculation ( Figure 3 The ice load setting in the above is the ice load on the overhead transmission line), combined with Figure 3 This impact calculation method will be described.

[0110] S1-2, the impact load of the anti-vibration hammer is obtained according to the following method:

[0111] Based on the initial configuration and structural design parameters of the overhead transmission line and the ice load on the overhead transmission line, the finite element model of the overhead transmission line is used to perform ice shedding jump calculation to obtain the maximum amplitude and circular vibration frequency of the overhead transmission line. The maximum amplitude and circular vibration frequency of the overhead transmission line are used to calculate the impact load on the anti-vibration hammer connected to the overhead transmission line.

[0112] Specifically, based on the structural design parameters of the overhead transmission line, the finite element model of the overhead transmission line is used to perform form-finding analysis on the overhead transmission line to obtain the initial configuration of the overhead transmission line. The form-finding analysis is to obtain the configuration of the self-balancing system of the overhead transmission line under the action of the gravity field, which is the basis for the static and dynamic analysis of the transmission line.

[0113] The initial configuration, structural design parameters and ice load of the overhead transmission line are input into the finite element model of the overhead transmission line, and the ice shedding jump calculation is performed to obtain the maximum amplitude and circular vibration frequency of the overhead transmission line.

[0114] Establish a parametric anti-vibration hammer finite element model, such as Figure 4 As shown in the figure, the structural design parameters that need to be input into the finite element model include: the mass of the anti-vibration hammer head, the moment of inertia of the anti-vibration hammer about the center of mass, the length of the anti-vibration hammer steel strand, the number of strands and single strand diameter of the anti-vibration hammer steel strand, and the bending stiffness of the anti-vibration hammer steel strand; considering the modeling efficiency, the shape models of the large hammer body and the small hammer body at the left and right ends of the anti-vibration hammer are consistent with the shape contour, center of gravity position and hammer body mass related to vibration dynamics, and are different from the details of the actual product; the hammer body masses at both ends of the anti-vibration hammer are different, which can broaden the natural frequency of the anti-vibration hammer and is beneficial to improving the anti-vibration effect of the anti-vibration hammer.

[0115] Assuming that the wire clamp connecting the anti-vibration hammer and the conductor does not deform, the wind vibration motion of the overhead transmission line is directly transmitted to the end of the anti-vibration hammer steel strand through the wire clamp. The end of the anti-vibration hammer steel strand is the connection between the anti-vibration hammer steel strand and the wire clamp. Therefore, the end of the anti-vibration hammer steel strand in the anti-vibration hammer finite element model is used as the vibration input boundary, as shown in Figure 5 shown.

[0116] The impact load on the anti-vibration hammer can be represented by the wind-induced displacement of the overhead power transmission line to which it is connected. That is, in this embodiment, the impact load on the anti-vibration hammer is the wind-induced displacement of the overhead power transmission line to which it is connected. The calculation expression of the wind-induced displacement is:

[0117] y=A sin(ωt)

[0118] Wherein, y represents the wind-induced displacement of the overhead transmission line, that is, the displacement amplitude of the vertical vibration of the overhead transmission line with an anti-vibration hammer, and the obtained wind-induced displacement is used as the impact load on the anti-vibration hammer; A represents the maximum amplitude of the overhead transmission line; ω represents the circular frequency of vibration of the overhead transmission line; and t represents time.

[0119] The obtained wind vibration displacement is used as the impact load on the anti-vibration hammer and input into the anti-vibration hammer finite element model for impact calculation; or the maximum amplitude, circular vibration frequency and the sine function expression of the overhead transmission line are directly input into the anti-vibration hammer finite element model to obtain the impact load for impact calculation.

[0120] Optionally, the following sine function can be used to represent the wind vibration motion of the overhead transmission line with the anti-vibration hammer, that is, the calculation expression of the impact load on the anti-vibration hammer is:

[0121]

[0122] in, represents the acceleration of the overhead transmission line, that is, the acceleration of the vibration input boundary of the anti-vibration hammer; y represents the wind vibration displacement of the overhead transmission line, that is, the impact load on the anti-vibration hammer; A represents the maximum amplitude of the overhead transmission line; ω represents the circular frequency of vibration of the overhead transmission line; t represents time;

[0123] therefore Figure 3 In the impact calculation step, you can also enter the impact load setting according to the acceleration amplitude Aω 2 Input of impact loads for design wind-induced vibrations.

[0124] S1-3. Based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-constructed bilinear isotropic strengthening model of the anti-vibration hammer steel strand, the anti-vibration hammer finite element model is used to perform impact calculation to obtain the rotation angle of the anti-vibration hammer steel strand.

[0125] Specifically, the structural design parameters of the anti-vibration hammer include: the mass of the anti-vibration hammer head, the moment of inertia of the anti-vibration hammer about the center of mass, the length of the anti-vibration hammer steel strand, the number of strands and the single strand diameter of the anti-vibration hammer steel strand and the bending stiffness of the anti-vibration hammer steel strand. The bending stiffness of the anti-vibration hammer steel strand can be obtained through calculation and input into the anti-vibration hammer finite element together with other structural design parameters for impact calculation, so it will be explained separately later.

[0126] The bending stiffness of the anti-vibration hammer steel strand is obtained by using the single-strand diameter and number of strands of the anti-vibration hammer steel strand in the structural design parameters of the anti-vibration hammer and the elastic modulus of the anti-vibration hammer steel strand in the pre-constructed bilinear isotropic strengthening model, combined with the bending stiffness calculation formula.

[0127] The calculation formula of the bending stiffness is:

[0128] EI=TEπd 4

[0129] Wherein, EI represents the bending stiffness of the anti-vibration hammer steel strand; E represents the elastic modulus of the anti-vibration hammer steel strand; d represents the diameter of a single strand in the anti-vibration hammer steel strand; and T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand. In this embodiment, the anti-vibration hammer steel strand has 19 strands, so T is 7.074.

[0130] Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, the impact load, the bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand.

[0131] The turning angle of the anti-vibration hammer steel strand is the bending angle of the anti-vibration hammer steel strand at the wire clamp.

[0132] The impact calculation method can be used to obtain the rotation angle of the anti-vibration hammer steel strand under different impact load conditions, laying a foundation for evaluating the bending degree of the anti-vibration hammer steel strand under impact load. And the bilinear isotropic strengthening model of the anti-vibration hammer steel strand is established using the tensile test data of the anti-vibration hammer steel strand; the range of elastic modulus and tangent modulus of the steel strand in the model is given, so that the rotation angle obtained by the impact calculation is more accurate, thus laying a foundation for analyzing the stress and deformation of the anti-vibration hammer steel strand under impact load.

[0133] After inputting the impact load of 1.2m into the finite element model of the vibration damper, the deformation of the vibration damper is as follows: Figure 6 As shown, Figure 6 The numbers in the lower middle indicate the strains of the anti-vibration hammers corresponding to different colors. Since the bending stiffness of the anti-vibration hammer head is large, the deformation of the hammer head is very small. The deformation of the anti-vibration hammer is mainly manifested as the bending plastic deformation of the anti-vibration hammer steel strand connected to the hammer head, and the degree of plastic bending of the anti-vibration hammer steel strand on the large hammer head side is significantly greater than that of the anti-vibration hammer steel strand on the small hammer head side. The bending plastic deformation occurs because the strain of the anti-vibration hammer steel strand connected to the hammer head exceeds the yield strain of the anti-vibration hammer steel strand.

[0134] like Figure 7 As shown in the figure, it is the amplitude of the end position of the large hammer head and the small hammer head of the vibration-proof hammer after the impact load of 1.2m is input to the vibration-proof hammer. Figure 7 Uz-left in the figure represents the amplitude of the left hammer head, which is represented by a dotted line in the figure (i.e. Figure 7 Uz-right represents the amplitude of the right hammer, which is represented by a solid line in the figure (i.e. Figure 7In the figure, the upper line in the middle shows that the amplitude fluctuation at the end of the large hammer head is very significant within 0-0.5 seconds, while the amplitude fluctuation at the end of the small hammer head is smaller, which indicates that the anti-vibration hammer steel strand on one side of the large hammer head has undergone obvious bending deformation.

[0135] like Figure 8 The figure shows the relationship between the boundary amplitude of the impact load and the angular slope of the anti-vibration hammer steel strand. It can be seen from the relationship diagram that when the boundary amplitude of the input impact load is in the range of 0.1m-0.9m, the angular slope of the anti-vibration hammer steel strand on the side of the anti-vibration hammer large hammer head increases nonlinearly with the boundary amplitude of the impact load. When the input impact load amplitude is in the range of 1m-1.2m, the angular slope of the anti-vibration hammer steel strand on the side of the anti-vibration hammer large hammer head increases nonlinearly with the boundary amplitude of the impact load; this is because the strain of the anti-vibration hammer steel strand connected to the hammer head exceeds the yield strain of the anti-vibration hammer steel strand under the action of a large impact load, resulting in an increase in the angular slope of the anti-vibration hammer steel strand on the side of the anti-vibration hammer large hammer head.

[0136] In step S2, based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, the steel strand structural optimization model is used to calculate and obtain the structural optimization parameters of the anti-vibration hammer steel strand;

[0137] The steel strand structure optimization model includes constraint conditions set based on various parameter values ​​before and after the anti-vibration hammer is impacted.

[0138] Specifically, Fig. 9 As shown, based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, and using the steel strand structure optimization model for calculation, the structural optimization parameters of the anti-vibration hammer steel strand are obtained.

[0139] Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, impact load, bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model (i.e. constitutive relationship) of the anti-vibration hammer steel strand, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand. Fig. 9 In order to clearly express the calculation part of bending stiffness (i.e. Fig. 9 In the wire stiffness setting part of the anti-vibration hammer steel strand, the material parameters of the anti-vibration hammer steel strand and the steel strand diameter (i.e., single strand diameter) and number of strands of the anti-vibration hammer steel strand in the structural parameters of the anti-vibration hammer, the elastic modulus of the anti-vibration hammer steel strand and the constitutive relationship of the tensile material of the anti-vibration hammer steel strand are split and represented. The material parameters include a bilinear isotropic strengthening model of the steel strand.

[0140] The structural optimization parameters of the anti-vibration hammer steel strand include the elastic modulus and single strand diameter of the anti-vibration hammer steel strand.

[0141] The construction of the steel strand structure optimization model includes:

[0142] Based on the number of strands of the anti-vibration hammer steel strand, the diameter of a single strand and the elastic modulus in the bilinear isotropic hardening model, an objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand.

[0143] In this embodiment, the anti-vibration hammer steel strand has 19 strands, and the bending stiffness calculation formula of the anti-vibration hammer steel strand is:

[0144] EI=7.047Eπd 4

[0145] Wherein, EI represents the bending stiffness of the anti-vibration hammer steel strand; E represents the elastic modulus of the anti-vibration hammer steel strand; d is the diameter of a single strand in the anti-vibration hammer steel strand.

[0146] The initial objective function for the optimization of the bending stiffness of the anti-vibration hammer steel strand is defined as:

[0147] f(X)=TπX 1 X 2 4

[0148] Wherein, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand. In this embodiment, the anti-vibration hammer steel strand has 19 strands, and T is 7.047; X 1 represents the first calculation parameter variable in the objective function, which represents the elastic modulus of the anti-vibration hammer steel strand here; x 2 It represents the second calculation parameter variable in the objective function, which represents the diameter of the single wire in the anti-vibration hammer steel strand.

[0149] Solving by the mean value model, the initial objective function can be transformed into:

[0150] E q {f(X)}=E q (TπX 1 X 2 4 )

[0151] Among them, E q It represents the mathematical expectation value. The elastic modulus x of the anti-vibration hammer steel strand of the same specification 1 and the diameter of the single strand X 2 All of them obey the normal distribution. According to the general manufacturing level of anti-vibration hammer steel strand, the coefficient of variation is taken as 0.005, that is, the coefficient of variation of anti-vibration hammer steel strand of the same specification is 0.005; f(X) represents the bending stiffness of the anti-vibration hammer steel strand, which is the joint probability density of the two calculation parameter variables.

[0152] The objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand. Therefore, the objective function in the structural optimization module is:

[0153] minE q {f(X)}=E q (TπX 1 X 2 4 )

[0154] Among them, E q represents the mathematical expectation value, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand; X 1 Indicates the elastic modulus of the anti-vibration hammer steel strand; X 2 Indicates the single strand diameter of the anti-vibration hammer steel strand.

[0155] Setting constraints on the objective function constitutes a steel strand structure optimization model; setting constraints on the objective function based on the parameter values ​​before and after the anti-vibration hammer is impacted, the constraints include one or more of the following: a rotation ratio constraint when the anti-vibration hammer steel strand is impacted and when the yield stress is reached, a natural frequency ratio constraint before and after the impact, and a power ratio constraint before and after the impact.

[0156] The calculation formula for the rotation angle ratio constraint when the anti-vibration hammer steel strand is impacted and reaches the yield stress is:

[0157]

[0158] Among them, S 1 represents the ratio of the rotation angle of the anti-vibration hammer steel strand obtained by impact calculation to the rotation angle at yield stress; θ represents the rotation angle of the anti-vibration hammer steel strand obtained after impact calculation; θ y It indicates the rotation angle of the anti-vibration hammer steel strand at the yield stress, that is, the rotation angle when the stress at the connection position of the anti-vibration hammer steel strand and the wire clamp reaches the yield stress; K 1 For S 1 The limit value of K is determined based on actual calculations. 1 The value range is 0.8 to 0.9. The calculation formula of the angle ratio constraint can only obtain the upper limit value, and there is no lower limit constraint. Therefore, the natural frequency ratio and power ratio are combined to constrain together.

[0159] The calculation formula for the natural frequency ratio constraint of the anti-vibration hammer steel strand before and after the impact is:

[0160]

[0161] Among them, S 2It indicates the ratio of the absolute value of the natural frequency difference before and after the vibration damper is subjected to the impact load to the absolute value of the natural frequency before the impact load; f a Indicates the natural frequency of the anti-vibration hammer before it is subjected to impact load; f b Indicates the natural frequency of the anti-vibration hammer after being subjected to impact load; K 2 For S 2 The limit value of K is determined based on actual calculations. 2 The value range is 0.1~0.2.

[0162] The calculation formula for the power ratio constraint of the anti-vibration hammer steel strand before and after the impact is:

[0163]

[0164] Among them, S 3 It indicates the ratio of the absolute value of the power difference before and after the anti-vibration hammer is subjected to the impact load to the absolute value of the power before the impact load; P a Indicates the power of the anti-vibration hammer before it is subjected to impact load; P b Indicates the power of the anti-vibration hammer after being subjected to impact load; K 3 For S 3 The limit value of K is determined based on actual calculations. 3 The value range is 0.1~0.2.

[0165] Therefore, the structural optimization model of the steel strand can be defined as:

[0166]

[0167] like Fig. 9 As shown in the figure, the rotation angle of the anti-vibration hammer steel strand is obtained by impact calculation and input into the structural optimization model of the anti-vibration hammer steel strand. On this basis, the ratio of various constraint conditions is calculated. If the constraint conditions of the structural optimization model are met, the structural calculation parameters of the anti-vibration hammer steel strand are output, that is, the optimal structural parameters. Otherwise, the structural calculation parameters of the bending stiffness of the anti-vibration hammer steel strand (X 1 , X 2 ), substitute it into the optimization model and recalculate until the constraints are met, and output the corresponding structural calculation parameters of the anti-vibration hammer steel strand.

[0168] In the structural optimization model of the present invention, the limit value of the rotation angle ratio constraint of the anti-vibration hammer steel strand when it is impacted and when it reaches the yield stress is stipulated. If this condition is met, it can be ensured that the anti-vibration hammer does not undergo obvious bending under the impact load; if the natural frequency and power constraints are met, it can be ensured that the frequency and power characteristics of the anti-vibration hammer do not undergo obvious changes under the large impact load, thereby further ensuring the anti-vibration effect of the anti-vibration hammer installed on the overhead transmission line under the large impact load.

[0169] The present invention provides constraint conditions in the steel strand structure optimization model, so when the bending stiffness of the anti-vibration hammer steel strand under a large impact load is optimized, the anti-vibration effect of the anti-vibration hammer under a large impact load is not reduced.

[0170] Example 2

[0171] Based on the same inventive concept, the present invention also provides an anti-vibration hammer steel strand bending stiffness optimization system based on impact calculation, such as Fig.10 As shown, including:

[0172] Impact calculation module: It is used to calculate the rotation angle of the anti-vibration hammer steel strand by using the anti-vibration hammer finite element model based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-built bilinear isotropic strengthening model of the anti-vibration hammer steel strand;

[0173] Structural optimization module: used to calculate the structural optimization parameters of the anti-vibration hammer steel strand based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, and using the steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on the values ​​of various parameters before and after the anti-vibration hammer is impacted;

[0174] The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

[0175] In the impact calculation module, the construction process of the bilinear isotropic strengthening model of the vibration-proof hammer steel strand includes:

[0176] Based on the tensile test of the anti-vibration hammer steel strand, the nominal yield strength, yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand of corresponding specifications are repeatedly measured;

[0177] The elastic modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress and yield strain measured each time, and the tangent modulus of the anti-vibration hammer steel strand measured each time is calculated based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time;

[0178] Based on the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand measured each time, the value ranges of the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand of the corresponding specification are fitted;

[0179] A bilinear isotropic strengthening model of anti-vibration hammer steel strand is established based on the range of nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand.

[0180] The impact calculation module is specifically used for:

[0181] The bending stiffness of the anti-vibration hammer steel strand is obtained by using the single-strand diameter and the number of strands of the anti-vibration hammer steel strand in the structural design parameters of the anti-vibration hammer and the elastic modulus of the anti-vibration hammer steel strand in the pre-constructed bilinear isotropic strengthening model, combined with the bending stiffness calculation formula;

[0182] Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, the impact load, the bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand.

[0183] In the structural optimization module, the structural optimization parameters of the anti-vibration hammer steel strand include the elastic modulus and the single strand diameter of the anti-vibration hammer steel strand.

[0184] The construction of the steel strand structure optimization model in the structure optimization module includes:

[0185] Based on the elastic modulus, strand number and single strand diameter of the anti-vibration hammer steel strand, an objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand.

[0186] Setting constraint conditions for the objective function to form a steel strand structure optimization model;

[0187] The constraint conditions include one or more of the following: a rotation angle ratio constraint when the vibration-proof hammer steel strand is impacted and when it reaches yield stress, a natural frequency ratio constraint before and after the impact, and a power ratio constraint before and after the impact.

[0188] The objective function in the structure optimization module is:

[0189] minE q {f(X)}=E q (TπX 1 X 2 4 )

[0190] Among them, E q represents the mathematical expectation value, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand; X 1 Indicates the elastic modulus of the anti-vibration hammer steel strand; X 2 Indicates the single strand diameter of the anti-vibration hammer steel strand.

[0191] The calculation formula for the rotation ratio constraint of the anti-vibration hammer steel strand when it is impacted and reaches the yield stress in the structural optimization module is:

[0192]

[0193] Among them, S 1represents the ratio of the rotation angle of the anti-vibration hammer steel strand obtained by impact calculation to the rotation angle at yield stress; θ represents the rotation angle of the anti-vibration hammer steel strand obtained after impact calculation; θ y Indicates the rotation angle of the anti-vibration hammer steel strand at yield stress; K 1 For S 1 limit.

[0194] The calculation formula for the natural frequency ratio constraint of the anti-vibration hammer steel strand before and after impact in the structural optimization module is:

[0195]

[0196] Among them, S 2 It indicates the ratio of the absolute value of the natural frequency difference before and after the vibration damper is subjected to the impact load to the absolute value of the natural frequency before the impact load; f a Indicates the natural frequency of the anti-vibration hammer before it is subjected to impact load; f b Indicates the natural frequency of the anti-vibration hammer after being subjected to impact load; K 2 For S 2 limit.

[0197] The calculation formula for the power ratio constraint of the anti-vibration hammer steel strand before and after the impact in the structural optimization module is:

[0198]

[0199] Among them, S 3 It indicates the ratio of the absolute value of the power difference before and after the anti-vibration hammer is subjected to the impact load to the absolute value of the power before the impact load; P a Indicates the power of the anti-vibration hammer before it is subjected to impact load; P b Indicates the power of the anti-vibration hammer after being subjected to impact load; K 3 For S 3 limit.

[0200] In the impact calculation module, the impact load of the anti-vibration hammer is obtained according to the following method:

[0201] Based on the initial configuration, structural design parameters and ice load of overhead transmission lines, the finite element model of overhead transmission lines is used to calculate ice shedding jump, and the maximum amplitude and circular vibration frequency of overhead transmission lines are obtained.

[0202] The impact load on the anti-vibration hammer connected to the overhead transmission line is calculated using the maximum amplitude and circular vibration frequency of the overhead transmission line.

[0203] Example 3

[0204] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the anti-vibration hammer steel strand bending stiffness optimization method based on impact calculation in the above embodiment.

[0205] Example 4

[0206] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the anti-vibration hammer steel strand bending stiffness optimization method based on impact calculation in the above embodiment.

[0207] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0208] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0209] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0210] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation is characterized in that: include: Based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-built bilinear isotropic strengthening model of the anti-vibration hammer steel strand, the anti-vibration hammer finite element model is used to perform impact calculation to obtain the rotation angle of the anti-vibration hammer steel strand; Based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, the structural optimization parameters of the anti-vibration hammer steel strand are calculated using a steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on various parameter values ​​before and after the anti-vibration hammer is impacted; The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

2. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 1, characterized in that: The construction process of the bilinear isotropic strengthening model of the anti-vibration hammer steel strand includes: Based on the tensile test of the anti-vibration hammer steel strand, the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand of corresponding specifications are repeatedly measured; Based on the yield stress and yield strain measured each time, the elastic modulus of the anti-vibration hammer steel strand corresponding to each measurement is calculated, and based on the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain measured each time, the tangent modulus of the anti-vibration hammer steel strand corresponding to each measurement is calculated; Based on the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand measured each time, the value ranges of the nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand of the corresponding specification are fitted; A bilinear isotropic strengthening model of anti-vibration hammer steel strand is established based on the range of nominal yield strength, elastic modulus and tangent modulus of the anti-vibration hammer steel strand.

3. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 2, characterized in that: The nominal yield strength of the anti-vibration hammer steel strand ranges from 1220MPa to 1475MPa; The elastic modulus of the anti-vibration hammer steel strand is in the range of 1.95×10 5 MPa~2.0×10 5 MPa; The tangent modulus of the anti-vibration hammer steel strand is in the range of 1.4×10 5 MPa~1.6×10 5 MPa.

4. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 2, characterized in that: The anti-vibration hammer steel strand rotation angle is obtained by using the anti-vibration hammer finite element model to perform impact calculation based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-constructed bilinear isotropic strengthening model of the anti-vibration hammer steel strand, including: The bending stiffness of the anti-vibration hammer steel strand is obtained by using the single-strand diameter and the number of strands of the anti-vibration hammer steel strand in the structural design parameters of the anti-vibration hammer and the elastic modulus of the anti-vibration hammer steel strand in the pre-constructed bilinear isotropic strengthening model, combined with the bending stiffness calculation formula; Based on the finite element model of the anti-vibration hammer, combined with the structural design parameters of the anti-vibration hammer, the impact load, the bending stiffness of the anti-vibration hammer steel strand and the bilinear isotropic strengthening model, the impact calculation is performed to obtain the rotation angle of the anti-vibration hammer steel strand.

5. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 2, characterized in that: The construction of the steel strand structure optimization model includes: Based on the number of strands of the anti-vibration hammer steel strand, the diameter of a single strand and the elastic modulus in the bilinear isotropic hardening model, an objective function is constructed with the goal of minimizing the mathematical expectation of the bending stiffness of the anti-vibration hammer steel strand. Setting constraint conditions for the objective function to form a steel strand structure optimization model; The constraint conditions include one or more of the following: a rotation angle ratio constraint when the vibration-proof hammer steel strand is impacted and when it reaches yield stress, a natural frequency ratio constraint before and after the impact, and a power ratio constraint before and after the impact.

6. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 5, characterized in that: The objective function is: minE q {f(X)}=E q (TπX1X2 4 ) Among them, E q represents the mathematical expectation value, f(X) represents the bending stiffness of the anti-vibration hammer steel strand; T represents the calculation parameter corresponding to the number of strands of the anti-vibration hammer steel strand; X1 represents the elastic modulus of the anti-vibration hammer steel strand; X2 represents the single strand diameter of the anti-vibration hammer steel strand.

7. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 5, characterized in that: The calculation formula for the rotation ratio constraint when the anti-vibration hammer steel strand is impacted and reaches the yield stress is: Where S1 represents the ratio of the rotation angle of the anti-vibration hammer steel strand obtained by impact calculation to the rotation angle at yield stress; θ represents the rotation angle of the anti-vibration hammer steel strand obtained after impact calculation; θ y It indicates the rotation angle of the anti-vibration hammer steel strand at yield stress; K1 is the limit value of S1.

8. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 5, characterized in that: The calculation formula for the natural frequency ratio constraint of the anti-vibration hammer steel strand before and after the impact is: Wherein, S2 represents the ratio of the absolute value of the natural frequency difference before and after the vibration damper is subjected to the impact load to the absolute value of the natural frequency before the impact load; f a Indicates the natural frequency of the anti-vibration hammer before it is subjected to impact load; f b It indicates the natural frequency of the anti-vibration hammer after being subjected to impact load; K2 is the limit value of S2.

9. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 5, characterized in that: The calculation formula for the power ratio constraint of the anti-vibration hammer steel strand before and after the impact is: Wherein, S3 represents the ratio of the absolute value of the power difference before and after the vibration damper is subjected to the impact load to the absolute value of the power before the impact load is subjected to the impact load; P a Indicates the power of the anti-vibration hammer before it is subjected to impact load; P b It indicates the power of the anti-vibration hammer after being subjected to impact load; K3 is the limit value of S3.

10. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 1, characterized in that: The structural optimization parameters of the anti-vibration hammer steel strand include the elastic modulus and single strand diameter of the anti-vibration hammer steel strand.

11. The method for optimizing the bending stiffness of anti-vibration hammer steel strand based on impact calculation according to claim 1, characterized in that: The impact load of the anti-vibration hammer is obtained according to the following method: Based on the initial configuration, structural design parameters and ice load of overhead transmission lines, the finite element model of overhead transmission lines is used to calculate ice shedding jump, and the maximum amplitude and circular vibration frequency of overhead transmission lines are obtained. The impact load on the anti-vibration hammer connected to the overhead power transmission line is calculated using the maximum amplitude and circular vibration frequency of the overhead power transmission line. 12.An anti-vibration hammer steel strand bending stiffness optimization system based on impact calculation, characterized in that: include: Impact calculation module: It is used to calculate the rotation angle of the anti-vibration hammer steel strand by using the anti-vibration hammer finite element model based on the structural design parameters of the anti-vibration hammer, the impact load and the pre-built bilinear isotropic strengthening model of the anti-vibration hammer steel strand; Structural optimization module: used to calculate the structural optimization parameters of the anti-vibration hammer steel strand based on the structural design parameters of the anti-vibration hammer and the rotation angle of the anti-vibration hammer steel strand, and using the steel strand structural optimization model, wherein the steel strand structural optimization model includes constraint conditions set based on the values ​​of various parameters before and after the anti-vibration hammer is impacted; The bilinear isotropic strengthening model of the anti-vibration hammer steel strand is constructed based on the measurement of the yield stress, yield strain, ultimate tensile stress and ultimate tensile strain of the anti-vibration hammer steel strand.

13. A computer device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the vibration-proof hammer steel strand bending stiffness optimization method based on impact calculation as described in any one of claims 1 to 11 is implemented.

14. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method for optimizing the bending stiffness of the vibration-proof hammer steel strand based on impact calculation as described in any one of claims 1 to 11 is implemented.

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