CN105468816A - Method for equivalent bending stiffness identification of glue binding node of electrical equipment porcelain insulation post - Google Patents
Method for equivalent bending stiffness identification of glue binding node of electrical equipment porcelain insulation post Download PDFInfo
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- CN105468816A CN105468816A CN201510751123.3A CN201510751123A CN105468816A CN 105468816 A CN105468816 A CN 105468816A CN 201510751123 A CN201510751123 A CN 201510751123A CN 105468816 A CN105468816 A CN 105468816A
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- identification
- binding node
- present
- bending stiffness
- mucilage binding
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Abstract
The present invention is a technical method for equivalent bending stiffness identification of a glue binding node of an electrical equipment porcelain insulation post. According to the method, a new equivalent bending modulus test identification technology of high-voltage electrical apparatus strut glue binding node is established on the basis of a homogenizing beam vibration theory; the core technology is a multi-frequency optimal fitting equivalent bending stiffness algorithm established on the basis of the structural system vibration theory; and a technical scheme for equivalent bending stiffness identification is established by detection test. The method provided by the present invention mainly solves a problem that equivalent bending stiffness cannot be identified effectively after a glue binding node of a high-voltage electrical post insulator is damaged.
Description
Technical field
This technological invention is the technical method of high voltage electric equipment porcelain insulating post mucilage binding node equivalent bending stiffness identification.
Background technology
I insulating of electric measurement of high pressure minor structure embeds technique by porcelain knob and cast iron flange by encapsulated material bonding to make.Under environmental load and seismic loading, the damage of structure mainly occurs in the weak part of node, node equivalent flexural modulus is the important parameter carrying out structural safety design, the formula estimation that traditional concrete moduli computing method adopt code for design of seismic of electrical installations (GB50260-1996) given.Because the mucilage binding node load-bearing capacity after damage declines, component equivalent flexural modulus change, the formula estimation that specification (GB50260-1996) is traditionally given, the impact of encapsulated material damage change on structural bending modulus can not be embodied, when practical engineering application, particularly the analysis and assessment of damaged structure have larger error.Norm-setting method can only pass through several parameter estimation in addition, and flange and porcelain knob mucilage binding complex structure, can not carry out legal equivalents to bending modulus, cause error larger architectural characteristic.Need the mensuration of carrying out parameter in conjunction with detection experiment, and then realize the identification to equivalent bending modulus.
Summary of the invention
The problem that equivalent bending stiffness after the present invention mainly solves the damage of high-voltage electrical apparatus support insulator mucilage binding node can not effectively identify.The present invention is based on homogeneous beam vibration theory and establish new High-Voltage Electrical Appliances pillar mucilage binding node equivalent flexural modulus test recognition technology.Core technology is the algorithm that structure based system theory of oscillation establishes multi-frequency Optimal Fitting equivalent bending stiffness, and is established the technical scheme of equivalent bending stiffness identification by detection experiment.The present invention is with pillar beam element for vibration analysis unit (as Fig. 2), and vibration constitutive model expression formula is:
Wherein: Δ
1=Y
afor beam A holds vertical displacement amplitude;
for beam A holds corner amplitude; Δ
3=Y
bfor rope B holds vertical displacement amplitude;
for rope B holds corner amplitude; P
1=Q
afor A end shear amplitude; P
2=M
afor A holds moment of flexure amplitude; P
3=Q
bb end shear amplitude; P
4=M
bfor B holds moment of flexure amplitude.
Element stiffness coefficient is respectively:
K
22＝K
44＝iF；
K
42＝K
24＝iH
Wherein:
for the Line stiffness coefficient of beam
EI is deflection of beam modulus, and ω is vibration of beam circular frequency, and m is the line density of beam, and l is the length of beam.
Like this, set up electric corbeling model of vibration by beam element vibration constitutive relation and express, following vibration equation can be set up
Following vibration equation can be set up
Thus set up frequecy characteristic equation
Can be write as:
f(E
1I
1,E
2I
2,l
1,l
2,l
k,m
1,m
2,m
k,E′I′,ω)＝0(2.b)
Wherein, lower supporting rod bending modulus E
1i
1, length l
1, line density m
1, upper porcelain knob bending modulus E
2i
2, length l
2, line density m
2and mucilage binding node height l
k, equivalent line density m
kfor known parameters, mucilage binding node equivalent flexural modulus parameter E ' I ' the unknown.
As can be seen from formula (2), Suo Li bending modulus parameter E ' I ' can be determined by measuring one-piece construction frequency values, the identification to this parameter can be set up.
Due to the transcendental equation that frequecy characteristic equation (2) is expressed for trigonometric function, circular frequency ω solution has infinite multiple, in order to improve the accuracy of identification to parameter E ' I ', needs to detect multistage frequency.
Core technology of the present invention is greater than 2 order frequency ω by measuring structure
i, set up optimization object function as follows
f
obj＝Min{Σ|f(E
1I
1,E
2I
2，l
1,l
2,l
k,m
1,m
2,m
k,E′I′,ω
i)}(3)
Again by conventional optimization method calculating parameter E ' I '.
Accompanying drawing explanation
Fig. 1 is the electric corbeling component of typical high voltage.Wherein a is isolating switch, b is mutual inductor, c is support insulator.
Fig. 2 is beam vibration analytic unit.
Fig. 3 is electric pillar component calculation diagram.
Fig. 4 is process implementing process flow diagram
Embodiment
Basic implementation step is as follows:
1) according to arrangement principle in pillar each section of placement sensor;
2) knock excitation respectively on each section of pillar, time domain vibration signals collecting is carried out in grouping;
3) apply time domain frequency transformation tool and carry out the conversion of time domain vibration signal, identify the multistage natural frequency of vibration of corbeling;
4) applied analysis identification facility, sets up corbeling vibration calculating model, then carries out the identification of mucilage binding node equivalent flexural E ' I ' according to multistage practical frequency.
Claims (6)
1. compared with the formulae discovery method that the present invention and tradition " specification " are recommended, be by the identification of detection experiment data message acquisition to mucilage binding node equivalent flexural modulus, common ground carries out calculating identification by mucilage binding node being reduced to beam model.
2. the key distinction is to the present invention is based on the identification that can obtain equivalent flexural modulus based on testing inspection, tradition " specification " computing method can only consider that the geometric parameters such as mucilage binding node length, mucilage binding thickness, empirical parameter are estimated, the change of equivalent flexural modulus after None-identified node damage deterioration.
3. the present invention be mainly used in high-voltage electrical apparatus corbeling anti-seismic performance calculate, assessment and structural safety safeguard, be the guardian technique of electrical equipment vibration prevention safety evaluation aspect.
4. the present invention can solve high voltage electric equipment porcelain insulating post mucilage binding node equivalent bending stiffness degree of precision identification problem, effectively can improve the accuracy that the anti-seismic performance of electric corbeling is calculated, promote improving and development of electrical equipment vibration prevention safety assessment technique.
5. advantage of the present invention is: technology implementation process is simple and convenient, and the measurement accuracy of identification of parameter is high; Frequency measurement is implemented easy to operate at the construction field (site), also can integrate with electric utility vibration monitor system, obtain multistage frequency, carry out the identification of structural damage; Calculate three parts by on-the-spot vibration signals collecting, signal analysis and equivalent flexural modulus to form.
6. purposes of the present invention: the acquisition of mucilage binding node parameters and the identification of high-voltage electrical apparatus corbeling damage during high-voltage electrical apparatus corbeling calculates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510751123.3A CN105468816A (en) | 2015-11-06 | 2015-11-06 | Method for equivalent bending stiffness identification of glue binding node of electrical equipment porcelain insulation post |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510751123.3A CN105468816A (en) | 2015-11-06 | 2015-11-06 | Method for equivalent bending stiffness identification of glue binding node of electrical equipment porcelain insulation post |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105468816A true CN105468816A (en) | 2016-04-06 |
Family
ID=55606512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510751123.3A Pending CN105468816A (en) | 2015-11-06 | 2015-11-06 | Method for equivalent bending stiffness identification of glue binding node of electrical equipment porcelain insulation post |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105468816A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872286A (en) * | 2017-01-04 | 2017-06-20 | 中国电力科学研究院 | The computational methods and system of composite bushing electrical equipment connecting portion bending stiffness |
| CN107063611A (en) * | 2017-04-11 | 2017-08-18 | 中国电力科学研究院 | Pillar class composite electrical equipment vibration prevention appraisal procedure |
| CN111291506A (en) * | 2018-11-21 | 2020-06-16 | 中国电力科学研究院有限公司 | Method and system for calculating bending stiffness of flange cementing connection part of composite insulator |
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| CN101762347A (en) * | 2009-12-31 | 2010-06-30 | 北京市建筑工程研究院 | Method for measuring rope force of multi-span steel stay rope by using half-wave method |
| CN101762346A (en) * | 2009-12-31 | 2010-06-30 | 北京市建筑工程研究院 | Method for measuring rope force of multi-span steel stay rope by using multi-frequency method |
| US20120310607A1 (en) * | 2011-05-20 | 2012-12-06 | Qingdao Technological University | Engineering structure multi-objective performance-based seismic design |
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2015
- 2015-11-06 CN CN201510751123.3A patent/CN105468816A/en active Pending
Patent Citations (3)
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| CN101762347A (en) * | 2009-12-31 | 2010-06-30 | 北京市建筑工程研究院 | Method for measuring rope force of multi-span steel stay rope by using half-wave method |
| CN101762346A (en) * | 2009-12-31 | 2010-06-30 | 北京市建筑工程研究院 | Method for measuring rope force of multi-span steel stay rope by using multi-frequency method |
| US20120310607A1 (en) * | 2011-05-20 | 2012-12-06 | Qingdao Technological University | Engineering structure multi-objective performance-based seismic design |
Non-Patent Citations (1)
| Title |
|---|
| 秦杰等: "基于多频率拟合法与半波法的拉索索力测试方法", 《第十三届空间结构学术会议论文集》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872286A (en) * | 2017-01-04 | 2017-06-20 | 中国电力科学研究院 | The computational methods and system of composite bushing electrical equipment connecting portion bending stiffness |
| CN107063611A (en) * | 2017-04-11 | 2017-08-18 | 中国电力科学研究院 | Pillar class composite electrical equipment vibration prevention appraisal procedure |
| CN107063611B (en) * | 2017-04-11 | 2020-07-24 | 中国电力科学研究院 | Anti-seismic evaluation method for electrical equipment made of pillar composite material |
| CN111291506A (en) * | 2018-11-21 | 2020-06-16 | 中国电力科学研究院有限公司 | Method and system for calculating bending stiffness of flange cementing connection part of composite insulator |
| CN111291506B (en) * | 2018-11-21 | 2024-05-24 | 中国电力科学研究院有限公司 | Method and system for calculating bending rigidity of flange glue joint of composite insulator |
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Application publication date: 20160406 |
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