CN110334481A - A kind of cold test device damping screen twine calculation method for stress - Google Patents
A kind of cold test device damping screen twine calculation method for stress Download PDFInfo
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- CN110334481A CN110334481A CN201910695184.0A CN201910695184A CN110334481A CN 110334481 A CN110334481 A CN 110334481A CN 201910695184 A CN201910695184 A CN 201910695184A CN 110334481 A CN110334481 A CN 110334481A
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- 238000013016 damping Methods 0.000 title claims abstract description 54
- 238000004364 calculation method Methods 0.000 title claims abstract description 19
- 239000000725 suspension Substances 0.000 claims abstract description 7
- 239000004744 fabric Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 238000004458 analytical method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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- Computer Hardware Design (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The application belongs to wind-tunnel technique field, it is related to a kind of cold test device damping screen twine calculation method for stress, the method includes determining the aerodynamic loading for being evenly arranged on damping screen twine, twine is assumed into suspension cable, under the conditions of this assumes, determine that twine becomes parabolical first length variation from straight line, and determine the variation of twine second length as caused by the tension of amount of deflection maximum, then change equal relationship according to two length, calculate the tension of twine amount of deflection maximum, so that it is determined that the maximum tension of twine, finally calculates the stress of twine.The application provides a kind of theoretical foundation for cold test device damping screen twine Stress calculation, the stress of selected damping screen twine under aerodynamic loading effect can be just calculated according to this calculating, the reasonability for further examining damping screen selection, improves the accuracy of damping screen design.
Description
Technical field
The application belongs to wind-tunnel technique field, in particular to a kind of cold test device damping screen twine Stress calculation side
Method.
Background technique
The damping screen fairing important as wind-tunnel stable section or exerciser stable section, is typically mounted at after honeycomb
Further decrease the turbulence intensity of air-flow.Damping screen belongs to single layer flat screen, has the characteristics that flexibility is big, structural rigidity is small,
During the test of cold test device, damping screen easily deforms under the action of aerodynamic loading, and twine bears tensile stress.
Currently, it is less to the research of the damping screen twine stress in the case where aerodynamic loading acts on, propose that damping screen exists without document
Aerodynamic loading acts on lower twine calculation method for stress.
Summary of the invention
One of in order to solve the above problem, present applicant proposes a kind of cold test device damping screen twine calculation method for stress,
Include:
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that twine is become throwing from straight line using parabola theories in suspension cable model
First length of object line changes；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, changed according to first length and change equal relationship with second length, calculate twine amount of deflection
The tension of maximum；
Step S5, the maximum tension of twine is determined；
Step S6, the stress of twine is determined；
Step S7, the intensity of the twine according to selected by the twine Stress Check of calculating.
Preferably, the aerodynamic loading that the determination is evenly arranged on damping screen twine includes:
Determine the aerodynamic loading F acted on damping screen；
Determine the twine number on unit width；
Determine the aerodynamic loading being evenly arranged on damping screen twine.
Preferably, in step S2, the variation of the first length are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, in step S3, the variation of the second length are as follows:
Wherein, S is the sectional area of twine, and E is elasticity modulus, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, in step S5, twine maximum tension are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, in step S6, twine stress are as follows:
Wherein, S is twine sectional area.
The application provides a kind of theoretical foundation for cold test device damping screen twine Stress calculation, can be according to this calculating side
Method calculates cold test device damping screen twine stress, the strength check for damping screen twine.
Detailed description of the invention
Fig. 1 is the application cold test device damping screen twine calculation method for stress flow chart.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application implementation clearer, below in conjunction with the application embodiment
In attached drawing, the technical solution in the application embodiment is further described in more detail.In the accompanying drawings, identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.Described embodiment is
A part of embodiment of the application, rather than whole embodiments.Embodiment below with reference to attached drawing description is to show
Example property, it is intended to for explaining the application, and should not be understood as the limitation to the application.Based on the embodiment in the application,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Apply for the range of protection.Presently filed embodiment is described in detail with reference to the accompanying drawing.
The application's is designed to provide a kind of cold test device damping screen twine calculation method for stress, solves damping screen
The problem of under aerodynamic loading effect without calculating damping screen twine strain method.
As shown in Figure 1, the application cold test device damping screen twine calculation method for stress, specifically includes that
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that twine is become throwing from straight line using parabola theories in suspension cable model
First length of object line changes；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, changed according to first length and change equal relationship with second length, calculate twine amount of deflection
The tension of maximum；
Step S5, the maximum tension of twine is determined；
Step S6, the stress of twine is determined；
Step S7, the intensity of the twine according to selected by the twine Stress Check of calculating.
The following detailed description of.
In cold test device, it is assumed that the air velocity for flowing through damping screen is v0。
When air-flow flows through damping screen, the aerodynamic loading acted on damping screen isWherein, K is damping
Net loss coefficient, ρ are current density, and A is the damping screen area of plane.
Damping screen in spherical, contacts with each other between twine under aerodynamic loading effect inside damping screen, generates contact and answers
Power, the whole overall stiffness thrown the net become larger, and twine presentation is non-linear, are calculated using analytic method, it is difficult to estimate nonlinear shadow
It rings, therefore approximately thinks not interact between twine and twine.
According to the aerodynamic loading calculation formula acted on damping screen, derive that the uniform load acted on twine calculates
Formula isWherein, n is the twine number on 1m wide screen.
Twine becomes parabola, length changes delta l from straight line are as follows:
Exerciser is run at normal temperature, and the variation of the length as caused by tension is Δ l1, for convenience of calculating, it is believed that the length of twine
Degree variation is the then length changes delta l as caused by tension as caused by the tension H of amount of deflection maximum1ForWherein, S
For the sectional area of twine, E is elasticity modulus.
According to the relationship that twine length changes, there is Δ l=Δ l1, the tension H of twine amount of deflection maximum can be calculated.Net
The tension T at any point on silk are as follows:
Twine maximum tension TmaxAre as follows:
Twine stress are as follows:Wherein, S is twine sectional area.
The application provides a kind of theoretical foundation for the Stress calculation of cold test device damping screen twine, can be according to this calculating
Method calculates the stress of selected damping screen twine under aerodynamic loading effect, further examines the reasonability of damping screen selection, mentions
The high accuracy of damping screen design.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be with the scope of protection of the claims
It is quasi-.
Claims (6)
1. a kind of cold test device damping screen twine calculation method for stress characterized by comprising
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that twine becomes parabola from straight line using parabola theories in suspension cable model
The first length variation；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, changed according to first length and change equal relationship with second length, it is maximum to calculate twine amount of deflection
The tension at place；
Step S5, the maximum tension of twine is determined；
Step S6, the stress of twine is determined；
Step S7, the intensity of the twine according to selected by the twine Stress Check of calculating.
2. cold test device damping screen twine calculation method for stress as described in claim 1, which is characterized in that the determination is equal
Aerodynamic loading of the cloth on damping screen twine include:
Determine the aerodynamic loading F acted on damping screen；
Determine the twine number on unit width；
Determine the aerodynamic loading being evenly arranged on damping screen twine.
3. cold test device damping screen twine calculation method for stress as described in claim 1, which is characterized in that in step S2,
The variation of first length are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
4. cold test device damping screen twine calculation method for stress as described in claim 1, which is characterized in that in step S3,
The variation of second length are as follows:
Wherein, S is the sectional area of twine, and E is elasticity modulus, and l is twine length, and H is the tension of amount of deflection maximum.
5. cold test device damping screen twine calculation method for stress as described in claim 1, which is characterized in that in step S5,
Twine maximum tension are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
6. cold test device damping screen twine calculation method for stress as described in claim 1, which is characterized in that in step S6,
Twine stress are as follows:
Wherein, S is twine sectional area.
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| CN201910695184.0A CN110334481A (en) | 2019-07-30 | 2019-07-30 | A kind of cold test device damping screen twine calculation method for stress |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614053A (en) * | 2009-07-10 | 2009-12-30 | 上海科达市政交通设计院 | High flexibility pre-pressing method pre-stress steel bar and its implementation |
| CN102839605A (en) * | 2012-09-25 | 2012-12-26 | 长沙理工大学 | Sag control method for small-sag datum strand |
| CN103594988A (en) * | 2013-12-02 | 2014-02-19 | 国家电网公司 | Deflection correction method for tubular busbar of 500kV substation |
| CN106383966A (en) * | 2016-10-18 | 2017-02-08 | 山东理工大学 | Design method for limiting deflection of few-leaf parabolic steel plate spring with non-isotactic end parts |
| CN108894120A (en) * | 2018-02-09 | 2018-11-27 | 广西交通科学研究院有限公司 | Arch ring transformation safe judgment method in spandrel construction disassembly process |
| CN109339834A (en) * | 2018-11-02 | 2019-02-15 | 山东科技大学 | A kind of method for protecting support of anchor pole-anchor cable cooperative transformation stress |
-
2019
- 2019-07-30 CN CN201910695184.0A patent/CN110334481A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614053A (en) * | 2009-07-10 | 2009-12-30 | 上海科达市政交通设计院 | High flexibility pre-pressing method pre-stress steel bar and its implementation |
| CN102839605A (en) * | 2012-09-25 | 2012-12-26 | 长沙理工大学 | Sag control method for small-sag datum strand |
| CN103594988A (en) * | 2013-12-02 | 2014-02-19 | 国家电网公司 | Deflection correction method for tubular busbar of 500kV substation |
| CN106383966A (en) * | 2016-10-18 | 2017-02-08 | 山东理工大学 | Design method for limiting deflection of few-leaf parabolic steel plate spring with non-isotactic end parts |
| CN108894120A (en) * | 2018-02-09 | 2018-11-27 | 广西交通科学研究院有限公司 | Arch ring transformation safe judgment method in spandrel construction disassembly process |
| CN109339834A (en) * | 2018-11-02 | 2019-02-15 | 山东科技大学 | A kind of method for protecting support of anchor pole-anchor cable cooperative transformation stress |
Non-Patent Citations (1)
| Title |
|---|
| 刘元周等: "试验器阻尼网变形量分析及井字形分块研究", 《 航 空 计 算 技 术》 * |
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Application publication date: 20191015 |