CN102798509B - Test method for high-speed railway contact network wind-induced response wind tunnel - Google Patents
Test method for high-speed railway contact network wind-induced response wind tunnel Download PDFInfo
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Abstract
The invention relates to a test method for high-speed railway contact network wind-induced response wind tunnel. The wind tunnel test is an effective method for researching high-speed railway contact network wind-induced response. At present, the reliable data of the test technology is insufficient. The test method comprises the following steps: designing a model according to the similarity ratio principle; simulating a wind tunnel boundary layer; calculating and analyzing by using a contact network system structure finite element model to acquire the elasticity, the frequency and the corresponding vibration mode of the contact network; manufacturing and installing a contact network wind tunnel gas bomb model and inspecting the elasticity, the frequency and the corresponding vibration mode of the model; and performing contact network wind tunnel gas bomb model wind tunnel test in a uniform flow field and a turbulent flow field respectively and superposing to acquire total wind-induced response. Under the condition of meeting the engineering precision, the span number is reduced and the boundary condition and the model material are simplified, so the controllability and the practicability are high. The wind tunnel gas bomb model test is performed according to the wind period and the wind speed of the line environment wind, a wind-resistant contact network system applicable to the line can be designed, and the safe reliability of the contact network system can be improved.
Description
Technical field
the invention belongs to railway electrification technical field, be specifically related to a kind of test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel.
Background technology
Along with the development of high-speed railway, particularly, under or the adverse environment condition such as Feng Qi compare Chang Feng district, air port or action of train wind higher at wind speed, the influence degree that the safe reliability of train operation is subject to strong wind is further outstanding.
Conventionally outdoor setting up of overhead contact line, is subject to environmental factor effect for a long time, does not have for subsequent usely, once break down, certainly will affect the normal operation of high-speed railway.Reliability, security and the bow net dynamic performance of strong wind district contact net is the key factor of the normal operation of motor train unit, directly affects safe, the normally operation of high-speed railway.In overhead contact line produces lifting and windage yaw under side wind action, also can produce wind-induced vibration.The lifting of contact net and the increase of transversal displacement, can affect pantograph safe operation and reliably be flowed; Wind-induced vibration not only affects contact net fatigue resistence, also affects bow net high-speed cruising dynamic mass, even causes pantograph and catenary fault and causes railway operation accident.In the time windbreak being set along the line, can produce strong wind speedup district and be positioned at the vortex cavity after windbreak, these all also may further strengthen the charming appearance and behaviour displacement response of contact net.
Therefore be necessary to analyze applied to high-speed railway touching net charming appearance and behaviour response characteristic, and wind tunnel test is the effective means of its charming appearance and behaviour response of research, is necessary applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel technique to conduct a research.Still lack at present the reliable data of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel technique both at home and abroad.
Summary of the invention
The object of this invention is to provide a kind of test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel, the kinematic behavior of model configuration and the turbulent flow of atmospheric boundary layer truly, the static and dynamic interaction of reflect structure and air more exactly, thereby the charming appearance and behaviour response characteristic of examination contact net, obtains lifting amount, span centre windage yaw amount and the lifting amount of positive antidirection finding place and the correlation displacement of other care positions.
The technical solution adopted in the present invention is:
The test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel, is characterized in that:
Realized by following steps:
Step 1: design a model according to ratio of similitude principle:
Determine wind speed scaling factor according to contact net wind field and the maximum the test wind of wind-tunnel; Set up contact net system structural finite element model, obtain the affect rule of contact net design parameter on its quiet kinematic behavior; Obtained the geometry scaling factor of suitable modelling and test by wind speed ratio, and then obtain quality, rigidity, tension force scaling factor, design contact net gas bullet model;
Step 2: simulating atmospheric wind tunnel boundary layers:
According to actual contact net reduced scale wind field environment and how much scaling factors of contact net, determine target wind spectrum; Test and adjust the boundary layer of wind-tunnel, make its wind profile, turbulence intensity section, turbulent wind spectrum compose consistent with target wind;
Step 3: utilize contact net system structural finite element model to carry out computational analysis, obtain elasticity, frequency and the corresponding vibration shape of contact net;
Step 4: make and installing contact net wind-tunnel gas bullet model, and elasticity, frequency and the corresponding vibration shape to model is tested;
Step 5: carry out respectively contact net gas bullet model wind tunnel test in uniform flow field and field of turbulent flow, by angle of attack plate or taking circuit as axial-rotation model, simulate the wind angle of attack, in two kinds of flow fields, the stack of charming appearance and behaviour response obtains total charming appearance and behaviour response.
In step 1, contact net design parameter comprises the elastic modulus across number, boundary condition, osculatory and carrier cable.
In step 1, than geometry scaling factor that obtains suitable modelling and test, be satisfied or abandon carrying out under two kinds of conditions of weight parameter principle of similarity by wind speed.
In step 4, making and installing contact net wind-tunnel gas bullet model comprise:
1) pillar modelling and installation: hinged between the steady arm base on column and positioning pipe, steady arm can be rotated in vertical plane; Flat wrist and oblique arm wrist and column are hinged, are that they can rotate in surface level; Upright post base and ground are fixed;
2) design and installation of tensioning equipment: use spring balance as tensioning equipment, device comprises spring balance, long bolt, nut, one end is cemented in the column with holes on ground, and width is slightly larger than screw rod diameter of section; When installation, one end of spring balance is buckled on one end of long bolt, and long bolt, through the hole on column, is greater than the nut of leghole at other end cover top external diameter; When stretch-draw, the other end of spring balance is buckled on osculatory or carrier cable, by regulating the nut on long bolt, can control the length of screw rod in border leghole one side, carrys out tensioning and loosens osculatory or carrier cable with this, and tension force can be by reading on spring balance;
3) osculatory and carrier cable are made and are installed: osculatory and carrier cable, through anchor point on steady arm, connect with spring balance respectively at contact net model two ends, carry out adjustment of tonicity; Install dropper and regulate after tension force, carrier cable and column junction are fixed, and anchor point is fixed;
In step 4, elasticity, frequency and the corresponding vibration shape process of testing to model are: apply power straight up by anchor point on osculatory and span centre, measure its displacement and can calculate these some place elasticity of acquisition; By applying vertical and transversely excited, can measure the first natural frequency of the corresponding vibration shape; The frequency of the elasticity of test and the corresponding vibration shape and finite element model are calculated to contrast, check and adjust gas bullet model, until there is finite element model result of calculation to coincide.
The present invention has the following advantages:
1) realized applied to high-speed railway touching net charming appearance and behaviour response wind tunnel test, this wind-tunnel technique has science, validity.
2) this wind-tunnel technique is scientific and reasonable: under the condition that meets engineering precision, can suitably reduce across number, simplify boundary condition and cast material.
3) this wind-tunnel technique controllability is strong: according to contact net place lineament, adjust the boundary element of wind-tunnel and simulate real atmosphere boundary layer flow field; By adding angle of attack plate or taking line direction as the axial-rotation modeling wind angle of attack.
4) method for designing is practical: for wind phase, the wind speed of circuit ambient wind, carry out wind-tunnel aerodynamic model test, can design the wind proof contact net system that is suitable for this circuit.Be applicable to the wind resistance of applied to high-speed railway touching net system, especially can be used for the adverse environment locations such as wind speed higher or Feng Qi compare Chang Feng district, air port and have the contact net system wind force proofing design wind tunnel test of higher wind resistance requirement, improve the safe reliability of contact net system.
Brief description of the drawings
Fig. 1 is operational flowchart of the present invention.
Fig. 2 is contact net system structural finite element model.
Embodiment
Below in conjunction with embodiment, the present invention will be described in detail.
Flow process shown in Figure 1, applied to high-speed railway touching net charming appearance and behaviour response wind tunnel test involved in the present invention, is realized by following steps:
Step 1: design a model according to ratio of similitude principle.
1) determine wind speed scaling factor, determined by contact net wind field and the maximum the test wind of wind-tunnel.
2) set up contact net system structural finite element model (see figure 2), carry out the research of contact net design parameter on its quiet kinematic behavior impact, parameter comprises the elastic modulus across number, boundary condition, osculatory and carrier cable.Research shows: use three across and above across number, osculatory and carrier cable two ends with spring border substitutes full compensation system, the contact net gas bullet model that relaxed osculatory similar with carrier cable elasticity axial rigidity (use iron wire) can fully characterize actual contact net system quiet kinematic behavior.
3) determine gas bullet model geometric scaling factor: first strictly meet weight parameter similar, obtain scaling factors how much by wind speed ratio; If the geometric parameter that obtains is not suitable for modelling and test, abandon weight parameter principle of similarity, because contact selects the rigidity of extension system mainly to be provided by tension force; Now, determine scaling factor how much by span summation and the tunnel size of multispan contact net gas bullet model (three across and more than).
4) obtain quality, rigidity, tension force scaling factor, and then design contact net gas bullet model.
Step 2: simulating atmospheric wind tunnel boundary layers.
1) according to connecing how much scaling factors of actual net-fault reduced scale wind field environment and contact net, determine target wind spectrum.
2) test and adjust the boundary layer of wind-tunnel, make its wind profile, turbulence intensity section, turbulent wind spectrum compose consistent with target wind.
Step 3: utilize contact net system structural finite element model to carry out computational analysis.Analyze the elasticity, frequency and the corresponding vibration shape that obtain contact net.
Step 4: make and installing contact net wind-tunnel gas bullet model, and elasticity, frequency and the corresponding vibration shape to model is tested.
1) pillar modelling and installation: hinged between the steady arm base on column and positioning pipe, steady arm can be rotated in vertical plane; Flat wrist and oblique arm wrist and column are hinged, are that they can rotate in surface level; Upright post base and ground are fixed.
2) design and installation of tensioning equipment: use spring balance as tensioning equipment, device comprises spring balance, long bolt, nut, one end is cemented in (width is slightly larger than screw rod diameter of section) the with holes column on ground.When installation, one end of spring balance is buckled on one end of long bolt, and long bolt, through the hole on column, is greater than the nut of leghole at other end cover top external diameter.When stretch-draw, the other end of spring balance is buckled on osculatory or carrier cable, by regulating the nut on long bolt, can control the length of screw rod in border leghole one side, carrys out tensioning and loosens osculatory or carrier cable with this, and tension force can be by reading on spring balance.
3) osculatory and carrier cable are made and are installed: osculatory and carrier cable, through anchor point on steady arm, connect with spring balance respectively at contact net model two ends, carry out adjustment of tonicity; Install dropper and regulate after tension force, carrier cable and column junction are fixed, and anchor point is fixed.
4) model testing: apply power straight up by anchor point on osculatory and span centre, measure its displacement and can calculate these some place elasticity of acquisition; By applying vertical and transversely excited, can measure the first natural frequency of the corresponding vibration shape.The frequency of the elasticity of test and the corresponding vibration shape and finite element model are calculated to contrast, check and adjust gas bullet model, until there is finite element model result of calculation to coincide.
Step 5: carry out contact net gas bullet model wind tunnel test.Test is carried out respectively in uniform flow field and field of turbulent flow, by angle of attack plate or taking circuit as axial-rotation model, simulates the wind angle of attack.In above two kinds of flow fields, the stack of charming appearance and behaviour response obtains total charming appearance and behaviour response.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skill in the art take technical solution of the present invention by reading instructions of the present invention, is claim of the present invention and contains.
Claims (5)
1. the test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel, is characterized in that:
Realized by following steps:
Step 1: design a model according to ratio of similitude principle:
Determine wind speed scaling factor according to contact net wind field and the maximum the test wind of wind-tunnel; Set up contact net system structural finite element model, obtain the affect rule of contact net design parameter on its quiet kinematic behavior; Obtained the geometry scaling factor of suitable modelling and test by wind speed scaling factor, and then obtain quality, rigidity, tension force scaling factor, design contact net gas bullet model;
Step 2: simulating atmospheric wind tunnel boundary layers:
According to actual contact net reduced scale wind field environment and how much scaling factors of contact net, determine target wind spectrum; Test and adjust the boundary layer of wind-tunnel, make its wind profile, turbulence intensity section, turbulent wind spectrum compose consistent with target wind;
Step 3: utilize contact net system structural finite element model to carry out computational analysis, obtain elasticity, frequency and the corresponding vibration shape of contact net;
Step 4: make and installing contact net wind-tunnel gas bullet model, and elasticity, frequency and the corresponding vibration shape to model is tested;
Step 5: carry out respectively contact net gas bullet model wind tunnel test in uniform flow field and field of turbulent flow, by angle of attack plate or taking circuit as axial-rotation model, simulate the wind angle of attack, in two kinds of flow fields, the stack of charming appearance and behaviour response obtains total charming appearance and behaviour response.
2. the test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel according to claim 1, is characterized in that:
In step 1, contact net design parameter comprises the elastic modulus across number, boundary condition, osculatory and carrier cable.
3. the test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel according to claim 1 and 2, is characterized in that:
In step 1, than geometry scaling factor that obtains suitable modelling and test, be satisfied or abandon carrying out under two kinds of conditions of weight parameter principle of similarity by wind speed.
4. the test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel according to claim 3, is characterized in that:
In step 4, making and installing contact net wind-tunnel gas bullet model comprise:
1) pillar modelling and installation: hinged between the steady arm base on column and positioning pipe, steady arm can be rotated in vertical plane; Flat wrist and oblique arm wrist and column are hinged, and they can be rotated in surface level; Upright post base and ground are fixed;
2) design and installation of tensioning equipment: use spring balance as tensioning equipment, device comprises spring balance, long bolt, nut, one end is cemented in the column with holes on ground, and width is slightly larger than screw rod diameter of section; When installation, one end of spring balance is buckled on one end of long bolt, and long bolt, through the hole on column, is greater than the nut of leghole at other end cover top external diameter; When stretch-draw, the other end of spring balance is buckled on osculatory or carrier cable, by regulating the nut on long bolt, can control the length of screw rod in border leghole one side, carrys out tensioning and loosens osculatory or carrier cable with this, and tension force can be by reading on spring balance;
3) osculatory and carrier cable are made and are installed: osculatory and carrier cable, through anchor point on steady arm, connect with spring balance respectively at contact net model two ends, carry out adjustment of tonicity; Install dropper and regulate after tension force, carrier cable and column junction are fixed, and anchor point is fixed.
5. the test method of applied to high-speed railway touching net charming appearance and behaviour response wind-tunnel according to claim 4, is characterized in that:
In step 4, elasticity, frequency and the corresponding vibration shape process of testing to model are: apply power straight up by anchor point on osculatory and span centre, measure its displacement and can calculate these some place elasticity of acquisition; By applying vertical and transversely excited, can measure the first natural frequency of the corresponding vibration shape; By the frequency of the elasticity of test and the corresponding vibration shape and the contrast of finite element model result of calculation, check and adjust gas bullet model, until coincide with finite element model result of calculation.
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| CN103217282B (en) * | 2013-03-26 | 2015-04-22 | 中国科学院工程热物理研究所 | Fatigue test method of blade scaling model of horizontal axis wind turbine based on equal-service-life principle |
| CN104458295B (en) * | 2014-12-29 | 2017-01-18 | 成都市第一建筑工程公司 | Construction method for crosswind multiphase flow system for high speed train test |
| CN106468616A (en) * | 2016-09-20 | 2017-03-01 | 华北电力大学 | A kind of computational methods of power transmission tower air spring pole design |
| CN108303230B (en) * | 2018-01-25 | 2023-05-23 | 广州大学 | Test system for bidirectional vibration wind tunnel test of wind energy collector |
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| CN1994784A (en) * | 2006-12-21 | 2007-07-11 | 铁道第一勘察设计院 | Mobile contact line of electrified railway |
| CN102393184A (en) * | 2011-07-13 | 2012-03-28 | 中铁第一勘察设计院集团有限公司 | Dynamic calculating method of wind-caused vibration and windage yaw of contact net of electrified railway |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994784A (en) * | 2006-12-21 | 2007-07-11 | 铁道第一勘察设计院 | Mobile contact line of electrified railway |
| CN102393184A (en) * | 2011-07-13 | 2012-03-28 | 中铁第一勘察设计院集团有限公司 | Dynamic calculating method of wind-caused vibration and windage yaw of contact net of electrified railway |
Non-Patent Citations (3)
| Title |
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| 吴家岚.高速铁路接触网风致响应分析.《中国优秀硕士学位论文》.2012,全文. |
| 张雷等.受电弓设备对列车气动特性影响的风洞试验.《中南大学学报（自然科学版）》.2011,第42卷(第12期),全文. * |
| 高速铁路接触网风致响应分析;吴家岚;《中国优秀硕士学位论文》;20120415;全文 * |
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