CN105067240A - Wind load test equipment and test method for transmission tower line system under action of moving thunderstorm wind - Google Patents

Abstract

The invention discloses wind load test equipment and a wind load test method for a transmission tower line system under the action of a moving thunderstorm wind. The test device comprises a jet device, wherein the jet device is formed by sequentially connecting a fan section, a diffusion section, a stable section and a contraction section which can change diameter of an outlet. The test device is characterized in that the jet device is equipped with a lifting mechanism which can adjust jet height and a driving mechanism which controls rotation speed of a rotor in a remote manner through a frequency converter, the driving mechanism can drive the jet device arranged on a sliding rail to move along the sliding rail at a specified speed, the jet device, the lifting mechanism and the driving mechanism form a non-steady-state thunderstorm-wind wind field simulation device capable of adjusting the jet height, and the non-steady-state thunderstorm-wind wind field simulation device is combined with a transmission tower rigidity pressure measuring model to form single balance force measurement test of a tower body truncated model and multiple balance force measurement test of the tower line system respectively.

Description

The wind load proving installation of Transmission Tower-line System and method of testing under the effect of a kind of motion thunderstorm wind

Technical field

The invention belongs to the wind force proofing design field of Transmission Tower-line System, relate to a kind of the wind load device and the method for testing that can be used for testing Transmission Tower-line System under the effect of motion thunderstorm wind, be specifically related to a kind ofly can be used for the test unit of variable element motion thunderstorm wind simulation and the development technique of corresponding tower line system wind load proving installation and relevant method of testing.

Background technology

Along with the continuous expansion of electrical network scale, from economic and social benefit, electric pressure and the transmission distance of transmission line of electricity improve gradually, are increased by the probability in complicated landform and adverse weather condition area thereupon.The flexibility of Transmission Tower-line System is large, damping is little, belongs to typical wind load sensitive structure, and in recent years, the electric transmission pole tower that high wind causes collapses in rising trend with the occurrence frequency of circuit windage yaw trip accident.According to statistics, the country such as Australia, the U.S. and South Africa occur more than 80% the charming appearance and behaviour accident of falling tower mainly produced by thunderstorm wind effect.And from the weather forecast during the survey data and accident of the scene of the accident, thunderstorm wind is one of inducement of the part accident of falling tower and windage yaw discharge accident most probably.Therefore, when the tower line design carrying out thunderstorm prone areas or charming appearance and behaviour accident region occurred frequently, be necessary to carry out the tower line system wind-excited responese checking computations under thunderstorm wind effect.

The domestic and international research about thunderstorm wind at present focuses mostly on the research of the wind loads distribution feature of under the wind field structure of static thunderstorm wind, wind field section model and thunderstorm wind effect all kinds of electric transmission pole tower, wind-excited responese and failure mechanism, for the wind-excited responese of tower line coupling system and the research then shorter mention of power transmission circuit caused by windage response under the simulation of wind of motion thunderstorm wind, the effect of motion thunderstorm wind.In this computation process, under the effect of motion thunderstorm wind, the reasonable value of the wind load of each base electric transmission pole tower and each trsanscondutor is main difficult point.In existing research, motion thunderstorm wind load is many from simulation transient state wind field, suppose in conjunction with pseudo steady, calculating computing formula according to blast is directly tried to achieve, wherein Shape Coefficient many employings the PBL wind value after the match, result of calculation is comparatively large to the dependence of wind-field model, and meanwhile, the accuracy of Shape Coefficient also remains to be discussed.Therefore, the present invention in conjunction with moveable fluidic device, by high frequency balance test, under directly can obtaining the effect of motion thunderstorm wind, the instantaneous Wind Loads Acting of each base electric transmission pole tower and each trsanscondutor.

Summary of the invention

The object of the invention is to the deficiency overcoming prior art existence, and the wind load proving installation of Transmission Tower-line System and method of testing under the effect of a kind of motion thunderstorm wind is provided, it solves in current tower line design specifications the problem not relating to tower line equivalent wind action mode under the extreme wind effect comprising motion thunderstorm wind wind field preferably, improves security and the power supply reliability of Transmission Tower-line System.

The technical solution adopted in the present invention is realized by following steps, the wind load proving installation of Transmission Tower-line System under the effect of a kind of motion thunderstorm wind, it comprises a fluidic device, described fluidic device is by fan section, diffuser, stable section and the contraction section that can change outlet bore connect composition successively, described fluidic device is configured with the elevating mechanism of an adjustable height of jet and is carried out the driving mechanism of motor speed Long-distance Control by frequency converter, described driving mechanism can move being placed in fluidic device on slide rail along slide rail with the speed of specifying, described fluidic device and elevating mechanism and driving mechanism together form the unstable state thunderstorm wind simulation of wind device of adjustable height of jet, described unstable state thunderstorm wind simulation of wind device is combined many balance tests of single balance test and the tower line system constituting tower body Truncation respectively with electric transmission pole tower rigidity pressure measuring model.

As preferably: described elevating mechanism comprises the hydraulic jack that smooth steel plate can be risen to specified altitude assignment by, and described smooth steel plate is configured with fills in padded cushion block after rising to specified altitude assignment; Described driving mechanism comprises the motor that is configured with counter in rotating shaft, and a pair motor speed carries out the frequency converter of Long-distance Control, and wherein frequency converter is equipped with the LCDs that can show fluidic device translational speed in real time.

Utilize described wind load proving installation to carry out a wind load method of testing for Transmission Tower-line System under the effect of motion thunderstorm wind, described method of testing comprises the steps:

Step one: reequip fluidic device, adds jacking gear to realize the quick adjustment of height of jet, can be used for the static thunderstorm wind wind field generating variable element;

Step 2: the fluidic device after repacking is equipped with the driving mechanism formed primarily of drive motor, frequency converter and moving track, can controls fluidic device and move along slide rail with the speed of specifying, forms the thunderstorm wind wind field of motion;

Step 3: determine the scaling factor tested according to test condition, designs and makes the rigidity pressure measuring model of Transmission Tower-line System;

Step 4: adopt multiple high frequency balance synchronously to carry out dynamometer check to tower line system model, records the overall thunderstorm wind load time-history that tower line system is born, and measures the instantaneous wind load at each position of electric transmission pole tower by single balance test of tower body Truncation;

Step 5: the wind-force time-histories recorded according to step 4, adopt Empirical mode decomposition, extract the average weight in wind load, according to the scaling factor of test, the instantaneous Wind Loads Acting that each base electric transmission pole tower calculating prototype further bears along distribution form and each trsanscondutor of the instantaneous Wind Loads Acting of short transverse.

As preferably: in method of testing of the present invention:

The particular content of step 3 is: according to the jet diameter of fluidic device contraction section and the ratio of horizontal scale variation range intending the thunderstorm wind of simulate, can determine the length scaling factor ρ of test _l, wherein intend the jet diameter D of the thunderstorm wind of simulating _jet, should choose in proper range according to the observed result of reality; Subsequently, according to the length scaling factor determined, complete the designing and making work of tower line system rigidity pressure measuring model; Meanwhile, can by actual design height z _dfobtain the height z in corresponding jet wind-tunnel _dm, choose specific jet wind speed V _jetwith the translational speed V of fluidic device _m, then the speed scaling factor tested wherein v _0m(z _dm) for being highly z in jet wind-tunnel _dmthe maximum mean wind speed of each measuring point, v _0f(z _df) be actual design wind speed;

The particular content of step 4 is: according to the wind field spatial distribution characteristic of thunderstorm wind, and the distance r of certain any wind speed size and this point and jet-core region is closely related in wind field; In motion thunderstorm wind wind field, due to the motion of jet-core region, r is in dynamic change, i.e. r=r (t); For transmission line of electricity, the form of r (t) is directly determined by the trend of transmission line of electricity and the relativeness of motion path; Therefore, the determination of operating condition of test is except (comprising D with Wind parameters in wind _jet, V _jetwith height of jet H) relevant beyond, also directly affected by the trend of transmission line of electricity and the relativeness of motion path;

The x that the definition cross-arm direction of electric transmission pole tower and vertical cross-arm direction are respectively body axle to y to, in the process of carrying out the test of tower line system many balances synchronous force measurement, when determining the relativeness of the trend of tower line system and motion path, only need set the position at the electric transmission pole tower barycenter place of circuit span centre and the vertical of motion path apart from e with transmit electricity tower body axle x to the angle β with motion path, then the position coordinates of all the other each towers and wire can obtain by the structure type of the span of wire and shaft tower is corresponding;

The particular content of described step 5 is: Empirical mode decomposition have employed adaptive generalized base, by successively extracting high frequency item in the process of screening signal, decomposite the low frequency in signal and the information compared with low frequency successively, effective separation of different frequency range signal can be realized; Adopt the method effectively can extract the average weight of force balance test figure herein, be designated as respectively with be specially D _jet=0.6m, V _jet=11.7m/s, H=2D _jet, when e=0, β=0, the full tower model M 1 of single tower recorded from single force balance and the test findings of Truncation M5 extract the transient state Wind Loads Acting obtained; According to certain conversion method, can convert and obtain the overall wind load that each base electric transmission pole tower bears along wind loads distribution and each trsanscondutor at each position of short transverse.

As preferably: in method of testing of the present invention:

In described step 4, rationally arrange operating condition of test, carry out dynamometer check respectively, three component recorded by each force balance project to the body direction of principal axis of electric transmission pole tower respectively, are designated as respectively with wherein, subscript n represents operating condition of test, by D _jet, V _jet, H, e and β determine; Subscript i represents that Truncation is numbered, and the quantity of Truncation determined by steel tower height and steel tower configuration, if full tower test, then and i=0; O represents that test type is the single balance test measuring the full tower of single tower or Truncation, and M is the many balance tests measuring tower line system; J is the steel tower numbering in tower line system;

In described step 5, for three towers, three towers are designated as T1, T2 and T3 respectively, two lines are designated as L1 and L2 respectively, carry out many balances synchronous force measurement test of tower line system in order respectively, the full tower dynamometer check of single tower of each tower and Truncation dynamometer check, and extracting average weight, then the full tower load of jth base electric transmission pole tower is with tower body position S _mx under different operating mode can be obtained by following formula to load, in like manner can obtain y to load and moment of torsion:

${\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right)={\stackrel{\‾}{F}}_{{\mathrm{xi}}_1-Oj}^n\left(t\right)-{\stackrel{\‾}{F}}_{{\mathrm{xi}}_2-Oj}^n\left(t\right),$ Wherein i ₁=m-1, i ₂=m, m=1,2,3,4

${\stackrel{\‾}{F}}_{xj-S_5}^n\left(t\right)={\stackrel{\‾}{F}}_{x4-Oj}^n\left(t\right)$

Kth across the wind load in vertical wires direction that bears of wire be:

${\stackrel{\‾}{F}}_{y-L_k}^n\left(t\right)={\stackrel{\‾}{F}}_{y0-{\mathrm{Mj}}_1}^n\left(t\right)-{\stackrel{\‾}{F}}_{{}_{y0-{\mathrm{Oj}}_1}}^n\left(t\right)+\frac{1}{2}\[{\stackrel{\‾}{F}}_{y0-{\mathrm{Mj}}_2}^n\left(t\right)-{\stackrel{\‾}{F}}_{y0-{\mathrm{Oj}}_2}^n\left(t\right)\],j_1=k,j_2=k+1$

By dimensional analysis, the scaling factor of load time scaling factor therefore the instantaneous Wind Loads Acting that prototype Transmission Tower-line System bears is:

${\stackrel{\‾}{P}}_{xj-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right),{\stackrel{\‾}{P}}_{yj-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right),{\stackrel{\‾}{T}}_{j-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{T}}_{j-S_m}^n\left(t\right)$

${\stackrel{\‾}{P}}_{y-L_k}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{y-L_k}^n\left(t\right)$

As preferably: in method of testing of the present invention:

In described step 4, high frequency balance is adopted to carry out in the process of dynamometer check, by building one concrete walls and several moveable concrete bearing is that high-frequency color Doppler provides rigid support, to reduce the signal to noise ratio (S/N ratio) in balance sampling process;

Concrete walls being provided with slide plate and slide rail, high frequency balance can be moved along body of wall, simultaneously by changing the position of moveable concrete bearing and the placing direction of model, the trend of transmission line of electricity and the relativeness of fluidic device mobile route can be considered;

All there is larger randomness in the path of the place occurred due to actual thunderstorm wind, time and motion, from conservative angle, designs and appropriate to the occasionly find out worst motion path.Therefore, the present invention is by regulating the position of moveable rigid mount, body of wall upper slide and rotating model, realize the rapid adjustment of transmission line of electricity trend and fluidic device motion path relative position, by the dynamometer check of multiple feature operating mode, the least favorable wind load of Transmission Tower-line System under motion thunderstorm wind of prototype can be obtained.

The present invention has following outstanding advantage:

1) can generate fast corresponding to the controlled motion thunderstorm wind wind field of jet orifice (eye of wind) movement velocity of specific Wind parameters in wind (comprising height of jet, jet wind speed and jet diameter), control accuracy and data reliability high;

2) under the effect of motion thunderstorm wind, the equivalent wind action of Transmission Tower-line System provides practicable method, practical, broad covered area; By the movement of rigid mount and the rotation of tower line system model, the relativeness of motion path and transmission line of electricity trend can be considered, the most unfavorable processing condition of particular column line system is explored, ensure the margin of safety of pole and tower design process;

3) result that high frequency balance records has comprised the information of the size and Orientation of load, can be reverted to the wind load of the Transmission Tower-line System of prototype through scale transformation, directly for the pole and tower design choice of members.

Accompanying drawing explanation

Fig. 1 is flow chart of steps of the present invention.

Fig. 2 is the structural representation of the moveable improvement fluidic device that the present invention relates to.

Fig. 3 is the right view of Fig. 2.

Fig. 4 is the vertical view of Fig. 2.

Fig. 5 is the body axle schematic diagram of electric transmission pole tower model.

Fig. 6 is the parameter schematic diagram determining operating condition of test.

Fig. 7 is the full tower of a certain base electric transmission pole tower and the structural representation of Truncation.

Fig. 8 is the wind load three component time-histories result of single tower full tower model M 1 that under a certain specific operation, single force balance records and adopts the instantaneous Wind Loads Acting result that obtains of Empirical mode decomposition.

Fig. 9 is the wind load three component time-histories result of single tower tower body Truncation M5 that under the operating mode identical with Fig. 8, single force balance records and the instantaneous Wind Loads Acting result that adopts Empirical mode decomposition to obtain.

Shown in figure, list of numerals is as follows: 1, the fan section of fluidic device; 2, the diffuser of fluidic device; 3, the stable section of fluidic device; 4, the contraction section of fluidic device; 5, stop means; 6, pulley; 7, rotation axis; 8, drive motor; 9, cushion block; 10, smooth steel plate; 11, High-precision high-frequency force balance; 12, concrete walls; 13, slide plate and slide rail; 14, removable concrete column; 15, hydraulic jack; 16, frequency converter.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.Shown in Fig. 1-7, the wind load proving installation of Transmission Tower-line System under the effect of a kind of motion thunderstorm wind of the present invention, it comprises a fluidic device, described fluidic device is by fan section 1, diffuser 2, stable section 3 and the contraction section 4 that can change outlet bore connect composition successively, described fluidic device is configured with the elevating mechanism of an adjustable height of jet and is carried out the driving mechanism of drive motor 8 rotating speed Long-distance Control by frequency converter 16, described driving mechanism can move being placed in fluidic device on slide rail 13 along slide rail with the speed of specifying, described fluidic device and elevating mechanism and driving mechanism together form the unstable state thunderstorm wind simulation of wind device of adjustable height of jet, described unstable state thunderstorm wind simulation of wind device is combined many balance tests of single balance test and the tower line system constituting tower body Truncation respectively with electric transmission pole tower rigidity pressure measuring model.

Shown in figure, described elevating mechanism comprises the hydraulic jack 15 that smooth steel plate 10 can be risen to specified altitude assignment by, and described smooth steel plate 10 is configured with fills in padded cushion block 9 after rising to specified altitude assignment; Described driving mechanism comprises the drive motor that is configured with counter in rotating shaft, and a pair drive motor rotating speed carries out the frequency converter 16 of Long-distance Control, and wherein frequency converter 16 is equipped with the LCDs that can show fluidic device translational speed in real time.

Utilize described wind load proving installation to carry out a wind load method of testing for Transmission Tower-line System under the effect of motion thunderstorm wind, it is characterized in that described method of testing comprises the steps:

Step one: reequip fluidic device, adds jacking gear to realize the quick adjustment of height of jet, can be used for the static thunderstorm wind wind field generating variable element;

Step 2: the fluidic device after repacking is equipped with the driving mechanism formed primarily of drive motor, frequency converter and moving track, can controls fluidic device and move along slide rail with the speed of specifying, forms the thunderstorm wind wind field of motion;

Step 3: determine the scaling factor tested according to test condition, designs and makes the rigidity pressure measuring model of Transmission Tower-line System;

Step 4: adopt multiple high frequency balance synchronously to carry out dynamometer check to tower line system model, records the overall thunderstorm wind load time-history that tower line system is born, and measures the instantaneous wind load at each position of electric transmission pole tower by single balance test of tower body Truncation;

Step 5: the wind-force time-histories recorded according to step 4, adopt Empirical mode decomposition, extract the average weight in wind load, according to the scaling factor of test, the instantaneous Wind Loads Acting that each base electric transmission pole tower calculating prototype further bears along distribution form and each trsanscondutor of the instantaneous Wind Loads Acting of short transverse.

Embodiment:

Step one: carry out fluidic device repacking, add jacking gear.

The change of height of jet realizes mainly through the height changing smooth iron plate, because lifting jack cannot as supporting construction, during practical operation, fill in cushion block 9 after smooth steel plate 10 iron plate being risen to specified altitude assignment by adopting hydraulic jack 15 and realize, as shown in Figure 2.In addition, this device, also by changing the outlet bore of contraction section and output power of motor, simulates multiple jet diameter and thunderstorm wind wind field corresponding to jet wind speed respectively

Step 2: increase drive unit.

Carried out the remote control of drive motor 8 rotating speed by frequency converter 16, wherein frequency converter 16 is equipped with LCDs, can the translational speed of real-time displaying device; Meanwhile, in conjunction with the counter on machine shaft, the displacement time-history curves of fluidic device accurately can be obtained.

Step 3: determine scaling factor, makes the rigidity pressure measuring model of tower line system.

According to the jet diameter of fluidic device contraction section and the ratio of horizontal scale variation range intending the thunderstorm wind of simulate, the length scaling factor ρ of test can be determined _l, wherein intend the jet diameter D of the thunderstorm wind of simulating _jet, should choose in proper range according to the observed result of reality.Subsequently, according to the length scaling factor determined, complete the designing and making work of tower line system rigidity pressure measuring model.Meanwhile, can by actual design height z _dfobtain the height z in corresponding jet wind-tunnel _dm, choose specific jet wind speed V _jetwith the translational speed V of fluidic device _m, then the speed scaling factor tested wherein v _0m(z _dm) for being highly z in jet wind-tunnel _dmthe maximum mean wind speed of each measuring point, v _0f(z _df) be actual design wind speed.

Step 4: determine operating condition of test, carries out the high frequency balance test of Truncation, tower model and tower line system respectively.

According to the wind field spatial distribution characteristic of thunderstorm wind, the distance r of certain any wind speed size and this point and jet-core region is closely related in wind field.In motion thunderstorm wind wind field, due to the motion of jet-core region, r is in dynamic change, i.e. r=r (t).For transmission line of electricity, the form of r (t) is directly determined by the trend of transmission line of electricity and the relativeness of motion path.Therefore, the determination of operating condition of test is except (comprising D with Wind parameters in wind _jet, V _jetwith height of jet H) relevant beyond, also directly affected by the trend of transmission line of electricity and the relativeness of motion path.

All there is larger randomness in the path of the place occurred due to actual thunderstorm wind, time and motion, from conservative angle, designs and appropriate to the occasionly find out worst motion path.Therefore, the present invention is by regulating the position of moveable rigid mount, body of wall upper slide and rotating model, realize the rapid adjustment of transmission line of electricity trend and fluidic device motion path relative position, by the dynamometer check of multiple feature operating mode, the least favorable wind load of Transmission Tower-line System under motion thunderstorm wind of prototype can be obtained;

The x that the definition cross-arm direction of electric transmission pole tower and vertical cross-arm direction are respectively body axle to y to, as shown in Figure 5, in the process of carrying out the test of tower line system many balances synchronous force measurement, when determining the relativeness of the trend of tower line system and motion path, only need set the position at the electric transmission pole tower barycenter place of circuit span centre and the vertical distance e of motion path and transmit electricity tower body axle x to the angle β with motion path, as shown in Figure 6, then the position coordinates of all the other each towers and wire can obtain by the structure type of the span of wire and shaft tower is corresponding;

Rationally arrange operating condition of test, carry out dynamometer check respectively, three component recorded by each force balance project to the body direction of principal axis of electric transmission pole tower respectively, are designated as respectively with wherein, subscript n represents operating condition of test, by D _jet, V _jet, H, e and β determine; Subscript i represents that Truncation is numbered, and the quantity of Truncation determined by steel tower height and steel tower configuration, each Truncation of certain steel tower and the numbering at each position of tower body as shown in Figure 7, if the test of full tower, then i=0; O represents that test type is the single balance test measuring the full tower of single tower or Truncation, and M is the many balance tests measuring tower line system; J is the steel tower numbering in tower line system.

Step 5: adopt Empirical mode decomposition to extract average weight, and test findings is converted into the instantaneous Wind Loads Acting of prototype.

Empirical mode decomposition have employed adaptive generalized base, by successively extracting high frequency item in the process of screening signal, decompositing the low frequency in signal and the information compared with low frequency successively, can realize effective separation of different frequency range signal.Adopt the method effectively can extract the average weight of force balance test figure herein, be designated as respectively with d is respectively shown in Fig. 8 and 9 _jet=0.6m, V _jet=11.7m/s, H=2D _jet, when e=0, β=0, the full tower model M 1 of single tower recorded from single force balance and the test findings of Truncation M5 extract the transient state Wind Loads Acting obtained.According to certain conversion method, can convert and obtain the overall wind load that each base electric transmission pole tower bears along wind loads distribution and each trsanscondutor at each position of short transverse.For three tower two lines, three towers are designated as T1, T2 and T3 respectively, two lines are designated as L1 and L2 respectively, carry out many balances synchronous force measurement test of tower line system in order respectively, the full tower dynamometer check of single tower of each tower and Truncation dynamometer check, and extracting average weight, then the full tower load of jth base electric transmission pole tower is with tower body position S _mx under different operating mode can be obtained by following formula to load, in like manner can obtain y to load and moment of torsion:

${\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right)={\stackrel{\‾}{F}}_{{\mathrm{xi}}_1-Oj}^n\left(t\right)-{\stackrel{\‾}{F}}_{{\mathrm{xi}}_2-Oj}^n\left(t\right),$ Wherein i ₁=m-1, i ₂=m, m=1,2,3,4

${\stackrel{\‾}{F}}_{xj-S_5}^n\left(t\right)={\stackrel{\‾}{F}}_{x4-Oj}^n\left(t\right)$

Kth across the wind load in vertical wires direction that bears of wire be:

${\stackrel{\‾}{F}}_{y-L_k}^n\left(t\right)={\stackrel{\‾}{F}}_{y0-{\mathrm{Mj}}_1}^n\left(t\right)-{\stackrel{\‾}{F}}_{{}_{y0-{\mathrm{Oj}}_1}}^n\left(t\right)+\frac{1}{2}\[{\stackrel{\‾}{F}}_{y0-{\mathrm{Mj}}_2}^n\left(t\right)-{\stackrel{\‾}{F}}_{y0-{\mathrm{Oj}}_2}^n\left(t\right)\],j_1=k,j_2=k+1$

By dimensional analysis, the scaling factor of load time scaling factor therefore the instantaneous Wind Loads Acting that prototype Transmission Tower-line System bears is:

${\stackrel{\‾}{P}}_{xj-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right),{\stackrel{\‾}{P}}_{yj-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{xj-S_m}^n\left(t\right),{\stackrel{\‾}{T}}_{j-S_m}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{T}}_{j-S_m}^n\left(t\right)$

${\stackrel{\‾}{P}}_{y-L_k}^n(t\·{\mathrm{\ρ}}_t)={\mathrm{\ρ}}_F\·{\stackrel{\‾}{F}}_{y-L_k}^n\left(t\right)$ 。

Claims (6)

1. the wind load proving installation of Transmission Tower-line System under motion thunderstorm wind effect, it comprises a fluidic device, described fluidic device is by fan section, diffuser, stable section and the contraction section that can change outlet bore connect composition successively, it is characterized in that described fluidic device is configured with the elevating mechanism of an adjustable height of jet and is carried out the driving mechanism of motor speed Long-distance Control by frequency converter, described driving mechanism can move being placed in fluidic device on slide rail along slide rail with the speed of specifying, described fluidic device and elevating mechanism and driving mechanism together form the unstable state thunderstorm wind simulation of wind device of adjustable height of jet, described unstable state thunderstorm wind simulation of wind device is combined many balance tests of single balance test and the tower line system constituting tower body Truncation respectively with electric transmission pole tower rigidity pressure measuring model.

2. the wind load proving installation of Transmission Tower-line System under motion thunderstorm wind according to claim 1 effect, it is characterized in that described elevating mechanism comprises the hydraulic jack that smooth steel plate can be risen to specified altitude assignment by, described smooth steel plate is configured with fills in padded cushion block after rising to specified altitude assignment; Described driving mechanism comprises the motor that is configured with counter in rotating shaft, and a pair motor speed carries out the frequency converter of Long-distance Control, and wherein frequency converter is equipped with the LCDs that can show fluidic device translational speed in real time.

3. utilize wind load proving installation described in claim 1 or 2 to carry out a wind load method of testing for Transmission Tower-line System under the effect of motion thunderstorm wind, it is characterized in that described method of testing comprises the steps:

Step one: reequip fluidic device, adds jacking gear to realize the quick adjustment of height of jet, can be used for the static thunderstorm wind wind field generating variable element;

Step 2: the fluidic device after repacking is equipped with the driving mechanism formed primarily of drive motor, frequency converter and moving track, can controls fluidic device and move along slide rail with the speed of specifying, forms the thunderstorm wind wind field of motion;

Step 3: determine the scaling factor tested according to test condition, designs and makes the rigidity pressure measuring model of Transmission Tower-line System;

Step 4: adopt multiple high frequency balance synchronously to carry out dynamometer check to tower line system model, records the overall thunderstorm wind load time-history that tower line system is born, and measures the instantaneous wind load at each position of electric transmission pole tower by single balance test of tower body Truncation;

Step 5: the wind-force time-histories recorded according to step 4, adopt Empirical mode decomposition, extract the average weight in wind load, according to the scaling factor of test, the instantaneous Wind Loads Acting that each base electric transmission pole tower calculating prototype further bears along distribution form and each trsanscondutor of the instantaneous Wind Loads Acting of short transverse.

4. the wind load method of testing of Transmission Tower-line System under motion thunderstorm wind according to claim 3 effect, is characterized in that:

The particular content of step 3 is: according to the jet diameter of fluidic device contraction section and the ratio of horizontal scale variation range intending the thunderstorm wind of simulate, can determine the length scaling factor ρ of test _l, wherein intend the jet diameter D of the thunderstorm wind of simulating _jet, should choose in proper range according to the observed result of reality; Subsequently, according to the length scaling factor determined, complete the designing and making work of tower line system rigidity pressure measuring model; Meanwhile, can by actual design height z _dfobtain the height z in corresponding jet wind-tunnel _dm, choose specific jet wind speed V _jetwith the translational speed V of fluidic device _m, then the speed scaling factor tested wherein v _0m(z _dm) for being highly z in jet wind-tunnel _dmthe maximum mean wind speed of each measuring point, v _0f(z _df) be actual design wind speed;

The particular content of step 4 is: according to the wind field spatial distribution characteristic of thunderstorm wind, and the distance r of certain any wind speed size and this point and jet-core region is closely related in wind field; In motion thunderstorm wind wind field, due to the motion of jet-core region, r is in dynamic change, i.e. r=r (t); For transmission line of electricity, the form of r (t) is directly determined by the trend of transmission line of electricity and the relativeness of motion path; Therefore, the determination of operating condition of test is except (comprising D with Wind parameters in wind _jet, V _jetwith height of jet H) relevant beyond, also directly affected by the trend of transmission line of electricity and the relativeness of motion path;

The x that the definition cross-arm direction of electric transmission pole tower and vertical cross-arm direction are respectively body axle to y to, in the process of carrying out the test of tower line system many balances synchronous force measurement, when determining the relativeness of the trend of tower line system and motion path, only need set the position at the electric transmission pole tower barycenter place of circuit span centre and the vertical of motion path apart from e with transmit electricity tower body axle x to the angle β with motion path, then the position coordinates of all the other each towers and wire can obtain by the structure type of the span of wire and shaft tower is corresponding;

The particular content of described step 5 is: Empirical mode decomposition have employed adaptive generalized base, by successively extracting high frequency item in the process of screening signal, decomposite the low frequency in signal and the information compared with low frequency successively, effective separation of different frequency range signal can be realized; Adopt the method effectively can extract the average weight of force balance test figure herein, be designated as respectively with be specially D _jet=0.6m, V _jet=11.7m/s, H=2D _jet, when e=0, β=0, the full tower model M 1 of single tower recorded from single force balance and the test findings of Truncation M5 extract the transient state Wind Loads Acting obtained; According to certain conversion method, can convert and obtain the overall wind load that each base electric transmission pole tower bears along wind loads distribution and each trsanscondutor at each position of short transverse.

5. the wind load method of testing of Transmission Tower-line System under motion thunderstorm wind according to claim 4 effect, is characterized in that:

In described step 4, rationally arrange operating condition of test, carry out dynamometer check respectively, three component recorded by each force balance project to the body direction of principal axis of electric transmission pole tower respectively, are designated as respectively with wherein, subscript n represents operating condition of test, by D _jet, V _jet, H, e and β determine; Subscript i represents that Truncation is numbered, and the quantity of Truncation determined by steel tower height and steel tower configuration, if full tower test, then and i=0; O represents that test type is the single balance test measuring the full tower of single tower or Truncation, and M is the many balance tests measuring tower line system; J is the steel tower numbering in tower line system;

In described step 5, for three towers, three towers are designated as T1, T2 and T3 respectively, two lines are designated as L1 and L2 respectively, carry out many balances synchronous force measurement test of tower line system in order respectively, the full tower dynamometer check of single tower of each tower and Truncation dynamometer check, and extracting average weight, then the full tower load of jth base electric transmission pole tower is with tower body position S _mx under different operating mode can be obtained by following formula to load, in like manner can obtain y to load and moment of torsion:

wherein i ₁=m-1, i ₂=m, m=1,2,3,4

Kth across the wind load in vertical wires direction that bears of wire be:

By dimensional analysis, the scaling factor of load time scaling factor therefore the instantaneous Wind Loads Acting that prototype Transmission Tower-line System bears is:

。

6. the wind load method of testing of Transmission Tower-line System under the motion thunderstorm wind effect according to claim 4 or 5, is characterized in that:

In described step 4, high frequency balance is adopted to carry out in the process of dynamometer check, by building one concrete walls and several moveable concrete bearing is that high-frequency color Doppler provides rigid support, to reduce the signal to noise ratio (S/N ratio) in balance sampling process;

Concrete walls being provided with slide plate and slide rail, high frequency balance can be moved along body of wall, simultaneously by changing the position of moveable concrete bearing and the placing direction of model, the trend of transmission line of electricity and the relativeness of fluidic device mobile route can be considered;

All there is larger randomness in the path of the place occurred due to actual thunderstorm wind, time and motion, from conservative angle, designs and appropriate to the occasionly find out worst motion path.Therefore, the present invention is by regulating the position of moveable rigid mount, body of wall upper slide and rotating model, realize the rapid adjustment of transmission line of electricity trend and fluidic device motion path relative position, by the dynamometer check of multiple feature operating mode, the least favorable wind load of Transmission Tower-line System under motion thunderstorm wind of prototype can be obtained.