CN103195860B - Shock absorption method and shock absorption system for eight-point type square electric equipment - Google Patents

Abstract

The invention provides a shock absorption method and a shock absorption system for eight-point type square electric equipment. The method comprises the steps as follows: collecting parameters comprising a preset number n (n is 8) of shock absorbers, a side length of a square shape formed in a way that eight shock absorbers are squarely and symmetrically arranged, and an attenuation ratio of seismic fortification intensity to seismic acceleration response; obtaining the quality, the length, the gravity center height, the elastic modulus and the inertial moment of the electric equipment, a seismic influence coefficient corresponding to the seismic fortification intensity, and site characteristic periods corresponding to design earthquake grouping and site classification of an electric equipment mounting site respectively; confirming the parameter limit conditions of the shock absorbers; and mounting eight adaptive shock absorbers at the root part of the electric equipment, wherein the shock absorbers are squarely and symmetrically arranged and the side length of the square shape is the side length of the square shape formed in a way that the eight preset shock absorbers are squarely and symmetrically arranged. The method obtains an expected shock absorption effect with lower cost and improves the seismic performance of the electric equipment.

Description

Eight point type square arrangement electrical equipment shock-dampening method and shock mitigation systems

Technical field

The present invention relates to cushion technique, particularly relate to a kind of eight point type square arrangement electrical equipment shock-dampening method and shock mitigation systems.

Background technology

Violent earthquake is one of great disaster source.Under violent earthquake effect, if lost efficacy as the electrical equipment of the visual plant of lifeline engineering or be seriously damaged, then may cause major disaster and economic loss difficult to the appraisal, such as: power breakdown not only has a strong impact on normal productive life and earthquake relief work work, and the likely secondary disaster such as initiation fire, the safety of life and property of serious threat people.

In view of the foregoing, domestic and international research institution and electrical equipment manufacturer, conducted in-depth research by electrical equipment self structure, improves the anti-seismic performance of electrical equipment self.In addition, also by arranging damper on structure for mounting electrical machinery, the reaction of decay electrical equipment under geological process is assisted by damper, thus available protecting electrical equipment, safeguard the safe and stable operation of electrical network.

But, electrical equipment of a great variety and various informative, prior art for certain electrical equipment select damper lack effective technological means, cause that the type selecting of damper exists blindness thus.In prior art, if for certain electrical equipment selects the performance of damper not mate with the dynamic characteristics of electrical equipment itself and ground motion parameter, then cannot reach expection damping effect, thus the security of electrical equipment under geological process can not be safeguarded, be unfavorable for the safe and stable operation of electrical network.

Summary of the invention

The invention provides a kind of eight point type square arrangement electrical equipment shock-dampening method and shock mitigation systems, for reaching expection damping effect at lower cost, improving the anti-seismic performance of electrical equipment.

One aspect of the invention provides a kind of shock-dampening method of eight point type square arrangement electrical equipments, comprising:

Acquisition parameter, the parameter of collection comprises: the damper quantity n preset and the attenuation ratio of the square square length of side, seismic fortification intensity and the seismic acceleration reaction be arranged symmetrically with of n=8,8 dampers; The quality of electrical equipment obtained, length, height of C.G., elastic modelling quantity and the moment of inertia, and the seismic influence coefficient corresponding with described seismic fortification intensity obtained, with the classification of design earthquake on installation of electrical equipment ground and Characteristic Site Period corresponding to site category;

According to the parameter determination damper parameter restrictive condition gathered; Described damper parameter restrictive condition comprises: yield force minimum of a value, initial stiffness allowed band, post-yield stiffness allowed band and damped coefficient allowed band;

For adaptive damper selected by described electrical equipment; The yield force of the damper of described adaptation is more than or equal to described yield force minimum of a value, and initial stiffness falls into described initial stiffness allowed band, post-yield stiffness falls into described post-yield stiffness allowed band and damped coefficient falls into described damped coefficient allowed band;

The damper of 8 described adaptations is installed at the root of described electrical equipment; The damper of 8 described adaptations is square and is arranged symmetrically with centered by described electrical equipment, and the described square length of side is the default square square length of side be arranged symmetrically with of 8 dampers.

The present invention additionally provides a kind of shock mitigation system on the other hand, comprising:

Electrical equipment, and 8 dampers being arranged on described electrical equipment root;

8 described dampers are square and are arranged symmetrically with centered by described electrical equipment, and the described square length of side is the default square square length of side be arranged symmetrically with of 8 dampers.

Eight point type square arrangement electrical equipment shock-dampening method and shock mitigation systems provided by the invention, by certain electric devices as quality, the property parameters such as length, to installation of electrical equipment relevant as seismic fortification intensity, Characteristic Site Period parameter, and the parameter as the reaction such as the attenuation ratio expection damping effect of seismic acceleration reaction is taken into consideration, for electrical equipment targeted design meets the damper parameter restrictive condition of expection damping effect, the damper with this electrical equipment adaptation is selected according to damper parameter restrictive condition, and the damper of described adaptation is installed at this electrical equipment root.Due to the damper selected for this electrical equipment; the reaction of decay electrical equipment under geological process can be assisted; the damping effect that its damping performance parameters and this electrical equipment are expected adapts; therefore; the present invention reaches expection damping effect at lower cost; improve the anti-seismic performance of electrical equipment, thus available protecting electrical equipment.

Accompanying drawing explanation

Fig. 1 is eight point type square arrangement electrical equipment shock-dampening method flow charts provided by the invention;

Fig. 2 is the determination method flow diagram of damper parameter restrictive condition provided by the invention;

Fig. 3 is the mechanical model that electrical equipment provided by the invention is reduced to simple substance point system;

Fig. 4 is R provided by the invention _awith corresponding relation curve map;

Fig. 5 is the structural representation of shock mitigation system provided by the invention;

Fig. 6 is the structural representation of upper junction plate in Fig. 5;

Fig. 7 is the structural representation of lower connecting plate in Fig. 5.

Detailed description of the invention

Fig. 1 is eight point type square arrangement electrical equipment shock-dampening method flow charts provided by the invention.Method as shown in Figure 1 comprises:

Step 11: acquisition parameter, the parameter of collection comprises: the damper quantity n preset and the attenuation ratio of the square square length of side, seismic fortification intensity and the seismic acceleration reaction be arranged symmetrically with of n=8,8 dampers; The quality of electrical equipment obtained, length, height of C.G., elastic modelling quantity and the moment of inertia, and the seismic influence coefficient corresponding with described seismic fortification intensity obtained, with the classification of design earthquake on installation of electrical equipment ground and Characteristic Site Period corresponding to site category.

Step 12: according to the parameter determination damper parameter restrictive condition gathered; Described damper parameter restrictive condition comprises: yield force minimum of a value, initial stiffness allowed band, post-yield stiffness allowed band and damped coefficient allowed band.

Step 13: for adaptive damper selected by described electrical equipment; The yield force of the damper of described adaptation is more than or equal to described yield force minimum of a value, and initial stiffness falls into described initial stiffness allowed band, post-yield stiffness falls into described post-yield stiffness allowed band and damped coefficient falls into described damped coefficient allowed band.

Step 14: the damper installing 8 described adaptations at the root of described electrical equipment; The damper of 8 described adaptations is square and is arranged symmetrically with centered by described electrical equipment, and the described square length of side is the default square square length of side be arranged symmetrically with of 8 dampers.

On the basis of technique scheme, optionally, following formula can be adopted to calculate described yield force minimum of a value:

$f=\frac{\mathrm{\α}\·g\·m\·H}{3A}$

Wherein, f represents yield force minimum of a value, and m represents the quality of described electrical equipment, H represents the height of C.G. of described electrical equipment, A represents the square square length of side be arranged symmetrically with of 8 default dampers, and α represents the seismic influence coefficient corresponding with presetting seismic fortification intensity, and g represents acceleration of gravity.

Optionally, described initial stiffness allowed band is: 15k≤k ₀≤ 20k, described post-yield stiffness allowed band is: $\frac{1}{50}{k}_0\≤k_t\≤\frac{1}{10}{k}_0;$

Wherein, k ₀represent the initial stiffness of adaptive damper, k _trepresent the post-yield stiffness of adaptive damper, k represents the stiffness coefficient of described electrical equipment.

Optionally, following formula can be adopted to calculate the stiffness coefficient of described electrical equipment:

$k=\frac{3\mathrm{EI}}{L^3}$

Wherein, k represents the stiffness coefficient of described electrical equipment, and E represents the elastic modelling quantity of described electrical equipment, and I represents the moment of inertia of described electrical equipment, and L represents the length of described electrical equipment.

Optionally, if the shape of cross section of described electrical equipment is circular, then following formula is adopted to calculate the moment of inertia of described electrical equipment:

$I=\frac{\mathrm{\π}{D}^4}{64}$

Wherein, I represents the moment of inertia of described electrical equipment, and D represents the external diameter of described electrical equipment circular cross section.

Optionally, if the shape of cross section of described electrical equipment is annular, then following formula is adopted to calculate the moment of inertia of described electrical equipment:

$I=\frac{\mathrm{\π}(D^4-d^4)}{64}$

Wherein, I represents the moment of inertia of described electrical equipment, and D represents the external diameter of described electrical equipment circular cylindrical cross-section, and d represents the internal diameter of described electrical equipment circular cylindrical cross-section.

Optionally, described damped coefficient allowed band is: 2c '≤c ₀≤ 5c '; Wherein, c ₀represent the damped coefficient of adaptive damper, c ' represents single damper damped coefficient average.

Following formula can be adopted to calculate described single damper damped coefficient average:

$c^{\′}=\frac{\mathrm{\ζ\ω}{m}_0}{3}$

Wherein, c ' represents described single damper damped coefficient, m ₀represent described electrical equipment equivalent mass and m represents the quality of described electrical equipment, ω represent described electrical equipment intrinsic frequency and k represents the stiffness coefficient of described electrical equipment, and ζ represents damping ratio, and described damping ratio reacts attenuation ratio R with the seismic acceleration preset _abetween meet following relation:

$R_a=\sqrt{\frac{1+{(2\mathrm{\ζ}{\mathrm{\ω}}_n/\mathrm{\ω})}^2}{{[1-{({\mathrm{\ω}}_n/\mathrm{\ω})}^2]}^2+{(2\mathrm{\ζ}{\mathrm{\ω}}_n/\mathrm{\ω})}^2}}$

Wherein, ω _nrepresent earthquake motion frequency and t _grepresent the Characteristic Site Period corresponding with the classification of design earthquake on the installation ground of described electrical equipment and site category.

The eight point type square arrangement electrical equipment shock-dampening methods that the present embodiment provides, by certain electric devices as quality, the property parameters such as length, to installation of electrical equipment relevant as seismic fortification intensity, Characteristic Site Period parameter, and the parameter as the reaction such as the attenuation ratio expection damping effect of seismic acceleration reaction is taken into consideration, for electrical equipment targeted design meets the damper parameter restrictive condition of expection damping effect, the damper with this electrical equipment adaptation is selected according to damper parameter restrictive condition, and the damper of described adaptation is installed at this electrical equipment root.Due to the damper selected for this electrical equipment; the reaction of decay electrical equipment under geological process can be assisted; the damping effect that its damping performance parameters and this electrical equipment are expected adapts; therefore; the present invention reaches expection damping effect at lower cost; improve the anti-seismic performance of electrical equipment, thus available protecting electrical equipment.

Defining method and the theoretical foundation of damper parameter restrictive condition of the present invention are described below in conjunction with Fig. 2.As shown in Figure 2, damper parameter restrictive condition comprises:

Step 21: the relevant parameter needed for damper parameter restrictive condition is determined in input, performs step 22,23 and 25.

Describedly determine that the relevant parameter needed for damper parameter restrictive condition comprises: the damper quantity n preset and the attenuation ratio R of n=8, default 8 square square length of side A, default seismic fortification intensity and seismic acceleration reactions be arranged symmetrically with of damper _a; Quality m, the length L of electrical equipment that obtain, height of C.G. H, elastic modulus E and the moment of inertia I, and the seismic influence coefficient α corresponding with described seismic fortification intensity obtained, with the classification of design earthquake on installation of electrical equipment ground and Characteristic Site Period T corresponding to site category _g.

Step 22: the yield force minimum of a value of the damper that estimation is adaptive, performs step 210.

Static(al) estimation algorithm is utilized to calculate the moment of flexure of electrical equipment root under geological process.Such as: seismic force is reduced to the concentrated force acting on electrical equipment center of gravity, as formula (1) can be adopted to calculate seismic force:

$F=\mathrm{\β}\·m\·{\stackrel{\·\·}{x}}_g---\left(1\right)$

Wherein, F represents seismic force, and m represents the quality of electrical equipment, and β represents dynamic magnification factor, represent the basic seismic design accekeration corresponding with default seismic fortification intensity.

In above-mentioned each parameter, needing to establish the factors such as earthquake-proof grade according to the area of installation of electrical equipment, after presetting the seismic fortification intensity of this electrical equipment, corresponding with default seismic fortification intensity can according to the regulation value of " seismic design provision in building code " (GB50011-2010) 3.2.2 article; β can adopt formula 2 to calculate:

$\mathrm{\β}=\mathrm{\α}/k^{/}=\mathrm{\α}/({\stackrel{\·\·}{x}}_g/g)=\mathrm{\αg}/{\stackrel{\·\·}{x}}_g---\left(2\right)$

In above formula (2), g represents acceleration of gravity, α represents the seismic acceleration corresponding with described default seismic fortification intensity, the α corresponding with default seismic fortification intensity, can according to the regulation value of " seismic design provision in building code " (GB50011-2010) 3.10.3 article.Seismic fortification intensity, with the corresponding relation between α can be as shown in table 1:

Table 1

Convolution (1) and formula (2) can obtain formula (3):

$F=\mathrm{\β}\·m\·{\stackrel{\·\·}{x}}_g=\mathrm{\α}\·g\·m---\left(3\right)$

Employing formula (3) can calculate the seismic force of electrical equipment under geological process of setting up defences, and wherein, m represents the quality of electrical equipment, and g represents acceleration of gravity, and α represents the seismic influence coefficient corresponding with presetting seismic fortification intensity.

Then, formula (4) is adopted to calculate the root bending moment of electrical equipment:

$M=F\·H=\mathrm{\β}\·m\·{\stackrel{\·\·}{x}}_g\·H=\mathrm{\α}\·g\·m\·H---\left(4\right)$

Wherein, H represents the distance between the center of gravity of electrical equipment and root.

Afterwards, adopt formula (5a) to calculate each damper needs to provide for resist this electrical equipment root bending moment needed for power.

$f=\frac{M}{\frac{n-2}{2}A}=\frac{2\mathrm{\α}\·g\·m\·H}{(n-2)A}---\left(5\right)$

Wherein, n represents the quantity of the damper installed at this electrical equipment root, and A represents the square square length of side be arranged symmetrically with of 8 default dampers.Optionally, can choose the bolt hole in the ring flange being arranged on electrical equipment root, as Mounting Location of Dampener, the span of A can be the 1.5-3.0 of the maximum gamp external diameter of this electrical equipment doubly.

N=8 in the present invention, then above formula (5a) can be expressed as:

$f=\frac{M}{3\·A}=\frac{\mathrm{\α}\·g\·m\·H}{3A}---\left(6\right)$

The f that employing formula (6) calculates, is the yield force minimum of a value with the damper of electrical equipment adaptation.

Step 23: the stiffness coefficient of estimation electrical equipment, performs step 24 and 26.

Electrical equipment can be reduced to single-degree-of-freedom system, k can be estimated based on simple substance point system mechanical model.

Electrical equipment is reduced to the mechanical model of simple substance point system as shown in Figure 3.In the mechanical model of simple substance point system, the quality of electrical equipment can be reduced to the particle concentrating on electrical equipment top, then the quality of electrical equipment is in simple substance point model:

$k=\frac{3\mathrm{EI}}{L^3}---\left(7\right)$

Wherein, E represents the elastic modelling quantity of electrical equipment material therefor; I represents the moment of inertia of electrical equipment, and the moment of inertia of electrical equipment can be tried to achieve according to the sectional dimension of electrical equipment; L represents the length of electrical equipment.

Might as well be circular with shape of cross section or the electrical equipment of annular is example, the computational methods of the moment of inertia are described.

If the shape of cross section of electrical equipment is circular, then the moment of inertia of electrical equipment adopts following formula to calculate:

$I=\frac{\mathrm{\π}{D}^4}{64}---\left(8\right)$

In above formula, I represents the moment of inertia of electrical equipment, and D represents the external diameter of electrical equipment circular cross section.

If the shape of cross section of electrical equipment is annular, then the moment of inertia of electrical equipment adopts following formula to calculate:

$I=\frac{\mathrm{\π}(D^4-d^4)}{64}---\left(9\right)$

In above formula, I represents the moment of inertia of electrical equipment, d and D represents internal diameter and the external diameter of electrical equipment annulus cross section respectively.

Step 24: initial stiffness allowed band and the post-yield stiffness allowed band of determining adaptive damper; Perform step 210.

Preferably, described initial stiffness allowed band is: 15k≤k ₀≤ 20k, described post-yield stiffness allowed band is: $\frac{1}{50}{k}_0\≤k_t\≤\frac{1}{10}{k}_0.$

Step 25: the equivalent mass of estimation electrical equipment, performs step 26.

The quality of electrical equipment adopts equivalent mass to represent in simple substance point model, and the relation wherein between the equivalent mass of electrical equipment and electrical equipment quality meets following formula:

$m_0=\frac{1}{4}m---\left(10\right)$

Step 26: according to the stiffness coefficient of electrical equipment and the equivalent mass of electrical equipment, the intrinsic frequency of estimation electrical equipment.

Following formula is adopted to estimate the intrinsic frequency of this electrical equipment:

$\mathrm{\ω}=\sqrt{\frac{k}{m_0}}---\left(11\right)$

Step 27: the damping ratio determining the shock absorption system be made up of 8 dampers.

Electrical equipment is reduced to single-degree-of-freedom system, then under geological process, the kinetics equation of typical structure is:

$m_0{\stackrel{\·\·}{x}}_s+c{\stackrel{\·}{x}}_s+{\mathrm{kx}}_s=-m_0{\stackrel{\·\·}{x}}_g---\left(12\right)$

Wherein, m ₀represent the equivalent mass of electrical equipment; x _s, represent electrical equipment respectively under geological process relative to the horizontal displacement on ground, speed, acceleration; represent the basic seismic design acceleration corresponding with default seismic fortification intensity; C represents the total damping coefficient of the shock absorption system be made up of 8 dampers, and k represents the stiffness coefficient of electrical equipment.

The dampingratioζ of the shock absorption system be made up of 8 dampers is made to be expressed as:

$\mathrm{\ζ}=\frac{c}{2\sqrt{{\mathrm{km}}_0}}=\frac{c}{2\mathrm{\ω}{m}_0}---\left(13\right)$

The then attenuation ratio R of seismic acceleration reaction _abe expressed as follows:

$R_a=\frac{{\stackrel{\·\·}{x}}_s}{{\stackrel{\·\·}{x}}_g}=\sqrt{\frac{1+{(2\mathrm{\ζ}{\mathrm{\ω}}_n/\mathrm{\ω})}^2}{{[1-{({\mathrm{\ω}}_n/\mathrm{\ω})}^2]}^2+{(2\mathrm{\ζ}{\mathrm{\ω}}_n/\mathrm{\ω})}^2}}---\left(14\right)$

Wherein: R _arepresent seismic acceleration attenuation ratio, its value is corresponding with expection damping effect; ω _nrepresent earthquake motion frequency and t _gfor Characteristic Site Period, Characteristic Site Period is according to the regulation value of " seismic design provision in building code " (GB50011-2010) 5.1.4 article, and classification of design earthquake and the corresponding relation between site category and Characteristic Site Period on installation of electrical equipment ground are as shown in table 2.

Table 2

The classification of design earthquake on installation of electrical equipment ground of the present invention, can check according to the appendix A (that is: China the main towns seismic fortification intensity, basic seismic design acceleration and classification of design earthquake) in " seismic design provision in building code " (GB50011-2010); After the classification of design earthquake determining installation of electrical equipment ground, by the Characteristic Site Period T that question blank 2 can be corresponding with the site category on installation of electrical equipment ground _g.

For ease of user's inquiry, improve the convenience that user uses, R can be drawn according to formula (14) _awith corresponding relation curve, as shown in Figure 4; At default R _awith determine afterwards, calculated by query graph 4 or employing formula (14), can R be obtained _a, the dampingratioζ of answering.

Step 28: the single damper damped coefficient estimating the shock absorption system be made up of 8 dampers.

Can be obtained by formula (13):

c＝2ωm ₀·ζ＝(n-2)c′ (15)

Wherein, c represents the total damping coefficient of the shock absorption system be made up of 8 dampers, and c ' represents single damping damped coefficient of the shock absorption system be made up of 8 dampers, and n represents the quantity of damper and n=8.

Can be obtained by formula (15):

$c^{\′}=\frac{2\mathrm{\ζ\ω}{m}_0}{n-2}=\frac{\mathrm{\ζ\ω}{m}_0}{3}---\left(16\right)$

Step 29: the damped coefficient allowed band determining adaptive damper; Perform step 210.

Preferably, described damped coefficient allowed band is: 2c '≤c ₀≤ 5c ';

Wherein, c ₀represent the damped coefficient of adaptive damper, c ' represents single damper damped coefficient of the shock absorption system be made up of 8 dampers.

Step 210: export damper parameter restrictive condition, described damper parameter restrictive condition comprises: yield force minimum of a value, initial stiffness allowed band, post-yield stiffness allowed band and damped coefficient allowed band.

After the described damper parameter restrictive condition of acquisition, can, according to described damper parameter restrictive condition, be the damper that the selection of this electrical equipment is adaptive.That select need to meet with damper that is this electrical equipment adaptation: the yield force of damper is greater than yield force minimum of a value, the initial stiffness of damper falls into described initial stiffness allowed band, the post-yield stiffness of damper falls into described post-yield stiffness allowed band, the damped coefficient of damper falls into described damped coefficient allowed band.

Fig. 5 is the structural representation of shock mitigation system provided by the invention.Shock mitigation system as shown in Figure 5 comprises: electrical equipment 51 and be arranged on 8 dampers 52 of electrical equipment 51 root, and wherein, damper 52 adopts method as shown in Figure 2 to determine.8 described dampers are square and are arranged symmetrically with centered by described electrical equipment, and described square length of side A is the default square square length of side be arranged symmetrically with of 8 dampers.

Optionally, shock mitigation system also comprises: upper junction plate 53, lower connecting plate 54 and cushion block 55.Upper junction plate 53 is connected with the root of described electrical equipment.Lower connecting plate 54 is corresponding with described upper junction plate 53 to be arranged; And described upper junction plate and described lower connecting plate correspondence offer 8 bolts hole 56, respectively as shown in Figure 6 and Figure 7.Cushion block 55 is arranged between described upper junction plate and described lower connecting plate.Damper 52 can be specially bolt type damper, and 8 bolt type damper correspondences pass respective bolt holes, to connect upper junction plate 53 and lower connecting plate 54.

Optionally, bolt hole is apart from the distance at upper junction plate edge, and bolt hole is apart from the distance to lower connecting plate edge, can require comprehensively to determine with " Code for design of steel structures " (GB50017-2003) according to installation of electrical equipment.Connecting plate should have larger rigidity.In the optional implementation of one, all desirable 25mm of thickness of upper junction plate and lower connecting plate; Cushion block diameter and height, be respectively 70mm and 10mm.

Zinc-Oxide Arrester is conventional electrical equipment.Might as well take shelter from the thunder for certain zinc oxide below, be illustrated as the instantiation of this electrical equipment determination damper parameter restrictive condition scope; For the parameter needed for this electrical equipment determination damper parameter restrictive condition, as shown in table 3:

Table 3

(1) formula (6) damper yield force minimum of a value is adopted:

$f=\frac{M}{3\·A}=\frac{\mathrm{\α}\·g\·m\·H}{3A}=\frac{0.9\×9.8\×225\×1.37}{3\×0.195}=4647.5\left(N\right)$

(2) formula (7) is adopted to calculate the stiffness coefficient of electrical equipment

$k=\frac{3\mathrm{EI}}{L^3}=\frac{3\×0.9\×{10}^{11}\×\frac{\mathrm{\π}({0.14}^4-{0.08}^4)}{64}}{{2.73}^3}=223559.4299(N/m)$

According to the stiffness coefficient of electrical equipment, determine initial stiffness allowed band and the post-yield stiffness allowed band of damper:

The initial stiffness allowed band of damper meets: 15k≤k ₀≤ 20k, i.e. 3353391 (N/m)≤k ₀≤ 4471189 (N/m);

The post-yield stiffness allowed band of damper meets:

(3) formula (10) is adopted to calculate the equivalent mass of electrical equipment:

$m_0=\frac{1}{4}m=56.25\left(\mathrm{kg}\right)$

Employing formula (11) calculates the intrinsic frequency of electrical equipment:

$\mathrm{\ω}=\sqrt{\frac{k}{m_0}}=\sqrt{\frac{223559.4299}{56.25}}$

By query graph 4 or the formula of employing (14), single damper damped coefficient that dampingratioζ=0.35 employing formula (16) calculates the shock absorption system be made up of 8 dampers can be calculated:

$c^{/}=\frac{\mathrm{\ω}{m}_0\·\mathrm{\ζ}}{3}=\frac{63.04\×56.25\×0.35}{3}=413.70N\·(S/m)$

Determine the damped coefficient allowed band of damper: 2c '≤c ₀≤ 5c, i.e. 827≤c ₀≤ 2069.

(4) damper meeting damper parameter restrictive condition is selected.

The yield force of SGDP-JQ-A3 type damper of China Electric Power Research Institute's research and development, initial shear stiffness, post-yield stiffness and damped coefficient are respectively 6000N, 4200000N/m, 120000N/m and 2000N (S/m), meet above-mentioned damper parameter restrictive condition, supporting installation can be carried out with this Zinc-Oxide Arrester.

(5) adopt the structure shown in Fig. 5, at Zinc-Oxide Arrester root Central Symmetry, 8 SGDP-JQ-A3 type dampers are installed, afterwards damping effect analysis are carried out to Zinc-Oxide Arrester.

Large commercial finite element analysis software ANSYS general in the world can be selected, set up the second value model that the first numerical model of Zinc-Oxide Arrester and Zinc-Oxide Arrester root install the shock mitigation system of 8 SGDP-JQ-A3 type dampers compositions respectively, be 9 degree according to the seismic fortification intensity shown in table 3 to set up defences and Characteristic Site Period is the damping requirement of 0.65s, respectively seismic acceleration time-history analysis carried out to these two numerical models.Analysis result shows, the peak acceleration of the first numerical model and second value model be respectively 2.4g and 0.49g, the seismic acceleration reaction attenuation ratio R of shock mitigation system under geological process _abe 1.225, close to presetting attenuation ratio 1.2.Above analysis result illustrates: adopt method provided by the invention to be the SGDP-JQ-A3 type damper that this Zinc-Oxide Arrester is chosen, can reach the damping effect preset, and ensures that arrester structure has good service behaviour under high-intensity earthquake effect.

One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (10)

1. eight point type square arrangement electrical equipment shock-dampening methods, is characterized in that, comprising:

Acquisition parameter, the parameter of collection comprises: the damper quantity n preset and the attenuation ratio of the square square length of side, seismic fortification intensity and the seismic acceleration reaction be arranged symmetrically with of n=8,8 dampers; The quality of electrical equipment obtained, length, height of C.G., elastic modelling quantity and the moment of inertia, and the seismic influence coefficient corresponding with described seismic fortification intensity obtained, with the classification of design earthquake on installation of electrical equipment ground and Characteristic Site Period corresponding to site category;

According to the parameter determination damper parameter restrictive condition gathered; Described damper parameter restrictive condition comprises: yield force minimum of a value, initial stiffness allowed band, post-yield stiffness allowed band and damped coefficient allowed band;

For adaptive damper selected by described electrical equipment; The yield force of the damper of described adaptation is more than or equal to described yield force minimum of a value, and initial stiffness falls into described initial stiffness allowed band, post-yield stiffness falls into described post-yield stiffness allowed band and damped coefficient falls into described damped coefficient allowed band;

The damper of 8 described adaptations is installed at the root of described electrical equipment; The damper of 8 described adaptations is square and is arranged symmetrically with centered by described electrical equipment, and the described square length of side is the default square square length of side be arranged symmetrically with of 8 dampers.

2. method according to claim 1, is characterized in that, adopts following formula to calculate described yield force minimum of a value:

$f=\frac{\mathrm{\α}\·g\·m\·H}{3A}$

Wherein, f represents yield force minimum of a value, and m represents the quality of described electrical equipment, H represents the height of C.G. of described electrical equipment, A represents 8 square square length of sides be arranged symmetrically with of damper, and α represents the seismic influence coefficient corresponding with presetting seismic fortification intensity, and g represents acceleration of gravity.

3. method according to claim 1, is characterized in that,

Described initial stiffness allowed band is: 15k≤k ₀≤ 20k, described post-yield stiffness allowed band is: $\frac{1}{50}{k}_0\≤k_t\≤\frac{1}{10}{k}_0;$

Wherein, k ₀represent the initial stiffness of adaptive damper, k _trepresent the post-yield stiffness of adaptive damper, k represents the stiffness coefficient of described electrical equipment.

4. method according to claim 3, is characterized in that, adopts following formula to calculate the stiffness coefficient of described electrical equipment:

$k=\frac{3\mathrm{EI}}{L^3}$

Wherein, k represents the stiffness coefficient of described electrical equipment, and E represents the elastic modelling quantity of described electrical equipment, and I represents the moment of inertia of described electrical equipment, and L represents the length of described electrical equipment.

5. method according to claim 4, is characterized in that,

If the shape of cross section of described electrical equipment is circular, then following formula is adopted to calculate the moment of inertia of described electrical equipment:

$I=\frac{{\mathrm{\πD}}^4}{64}$

Wherein, I represents the moment of inertia of described electrical equipment, and D represents the external diameter of described electrical equipment circular cross section.

6. method according to claim 4, is characterized in that,

If the shape of cross section of described electrical equipment is annular, then following formula is adopted to calculate the moment of inertia of described electrical equipment:

$I=\frac{\mathrm{\π}(D^4-d^4)}{64}$

Wherein, I represents the moment of inertia of described electrical equipment, and D represents the external diameter of described electrical equipment circular cylindrical cross-section, and d represents the internal diameter of described electrical equipment circular cylindrical cross-section.

7., according to the arbitrary described method of claim 1-6, it is characterized in that,

Described damped coefficient allowed band is: 2c'≤c ₀≤ 5c'; Wherein, c ₀represent the damped coefficient of adaptive damper, c' represents single damper damped coefficient of the shock absorption system be made up of 8 dampers.

8. method according to claim 7, is characterized in that, adopts following formula to calculate described single damper damped coefficient average:

Wherein, c' represents described single damper damped coefficient, m ₀represent described electrical equipment equivalent mass and m represents the quality of described electrical equipment, ω represent described electrical equipment intrinsic frequency and k represents the stiffness coefficient of described electrical equipment, represent damping ratio, described damping ratio reacts attenuation ratio R with the seismic acceleration preset _abetween meet following relation:

Wherein, ω _nrepresent earthquake motion frequency and t _grepresent the Characteristic Site Period corresponding with the classification of design earthquake on the installation ground of described electrical equipment and site category.

9. adopt a shock mitigation system for the shock-dampening method described in any one of claim 1-8, it is characterized in that, comprising:

Electrical equipment, and 8 dampers being arranged on described electrical equipment root;

8 described dampers are square and are arranged symmetrically with centered by described electrical equipment, and the described square length of side is the default square square length of side be arranged symmetrically with of 8 dampers.

10. system according to claim 9, is characterized in that, also comprises:

Upper junction plate, is connected with the root of described electrical equipment;

Lower connecting plate, correspondingly with described upper junction plate is arranged; And described upper junction plate and described lower connecting plate correspondence offer 8 bolts hole;

Cushion block, is arranged between described upper junction plate and described lower connecting plate;

Described damper is specially bolt type damper, and 8 described bolt type damper correspondences pass respective bolt holes, to connect described upper junction plate and described lower connecting plate.