CN104266921A - Portable evaluation system and method based on wireless intelligent nodes for fatigue life of steel bridge - Google Patents
Portable evaluation system and method based on wireless intelligent nodes for fatigue life of steel bridge Download PDFInfo
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- CN104266921A CN104266921A CN201410562432.1A CN201410562432A CN104266921A CN 104266921 A CN104266921 A CN 104266921A CN 201410562432 A CN201410562432 A CN 201410562432A CN 104266921 A CN104266921 A CN 104266921A
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Abstract
The invention provides a portable evaluation system and method based on wireless intelligent nodes for the fatigue life of a steel bridge. The evaluation system comprises the plurality of wireless intelligent nodes, a base station and a monitor center, wherein the wireless intelligent nodes comprise a plurality of front-end acquisition modules, first data processing units, first wireless transceivers, first high-gain antennas and power supply units; the base station comprises a plurality of second high-gain antennas, second wireless transceivers, second data processing units and network conversion units. According to the evaluation system, a wireless transmission mode is adopted, so that the on-site wire pulling operation and arranging operation are avoided, the mounting process is convenient, and the normal running of the bridge cannot be influenced; fatigue evaluation algorithms are embedded into the wireless intelligent nodes, a large amount of acquired original data can be processed in the nodes, a final result can be sent to the base station, the wireless transmission data size is greatly reduced, no data loss is guaranteed, and the energy consumption is reduced.
Description
Technical field
The present invention relates to a kind of fatigue assessment system for steel bridge construction and method, particularly a kind of steel bridge fatigue life-span portable evaluating system based on intelligent wireless node and method.
Background technology
Along with integral node is used just gradually in the design of large span steel truss bridge, the fatigue problem of welding local under action of traffic loading causes the attention of people day by day.Fatigure failure is a kind of principal mode that welded steel structure lost efficacy, one of feature of failure damage is the loop cycle load that welded steel structure subjects for a long time lower than material yield point, produce local prominent accumulated damage at a place or a few place, crack after certain cycle index or occur to rupture completely.Because such structural damage fracture is sudden often, seldom have emissary in advance, the loss therefore brought is huge.
Cause the internal cause of structural fatigue to be structure self character, external cause is the dynamic load acting on structurally constantly change, the fatigue of research structure, first must study the stress acting on structural load and produce in the structure.
In a lot of situation, it is time dependent for acting on structural load, and this loading procedure is called load-time history.In order to the load-time history during recording bridge operation, traditional wired detection means needs, through loaded down with trivial details bracing wire, installation work, to involve great expense usually, installs extremely inconvenience, often have impact on the normal operation of bridge, be difficult to the load-time spectrum obtaining the bridge normal operation stage.In addition, steel bridge truss-frame structure Nodes, because weld seam is more, various informative, wired detection means is often difficult to dispose multiple measuring point at these key positions, and each measuring point mostly adopts centralized data processing technique, a large amount of redundant datas all can be concentrated and be sent to assessment center, often easily causes systemic breakdown.Also lack at present effective means can fast, easily to assessing the fatigue lifetime of steel bridge.
Summary of the invention
For the deficiencies in the prior art part, the object of the present invention is to provide a kind of steel bridge fatigue life-span portable evaluating system based on intelligent wireless node and method, meet installation convenient, simple to operate, measuring accuracy is high, does not affect the requirements such as bridge normal operation.
For achieving the above object, the technical solution used in the present invention is:
The present invention is based on the steel bridge fatigue life-span portable evaluating system of intelligent wireless node, comprise some intelligent wireless nodes, base station and Surveillance center.
Described intelligent wireless node comprises multiple front end acquisition module, the first data processing unit, the first wireless transceiver, the first high-gain aerial and power supply unit; Described front end acquisition module comprises strainometer, Wheatstone bridge, adjustable amplifying circuit, four-way analog to digital converter, frequency overlapped-resistable filter able to programme and digital output interface; Described first data processing unit comprises the high-performance processor of embedded estimating method for fatigue life, mass storage, input interface and output interface; Described digital output interface in described front end acquisition module is connected with the input interface on described data processing unit; Described output interface on described data processing unit is connected with described first wireless transceiver; Described first wireless transceiver is connected with described first high-gain aerial; Described power supply unit is described multiple front end acquisition module, described first data processing unit and described first wireless transceiver are powered.
Described base station comprises some second high-gain aerials, some second wireless transceivers, the second data processing unit and network switching unit; Described second wireless transceiver and described first wireless transceiver one_to_one corresponding, and described first wireless transceiver is by described first high-gain aerial and described second high-gain aerial and described second transceiver wireless connections; Described second wireless transceiver is connected with described second data processing unit; Described second data processing unit comprises high-performance processor, the mass storage of embedded comprehensive estimating method for fatigue life; Described second data processing unit is connected with described Surveillance center network by described network switching unit.
The present invention is based on the steel bridge fatigue life-span portable appraisal procedure of intelligent wireless node, comprise the following steps:
1) easily be there are tired some pads at steel bridge in some intelligent wireless inserting knot.
2) strain data of front end acquisition module collection caused by external environment encourages on described intelligent wireless node, and strain data is removed noise.
3) the first data processing unit on described intelligent wireless node is by step 2) the described strain data that obtains after filtering is converted to stress course.
4) the first data processing unit on described intelligent wireless node, the stress amplitude under utilizing rain flow method calculating external environment to encourage and the cycle index of its correspondence.
5) the first data processing unit on described intelligent wireless node, utilizes mathematical statistics analysis, determines the average daily standard stress spectra under external environment excitation.
6) the first data processing unit on described intelligent wireless node, according to corresponding welding node details, determines the standard S-N curve of welding node.
7) the first data processing unit on described intelligent wireless node utilizes Miner criterion to calculate the fatigue lifetime of welding node, obtains assessment result.
8) each described intelligent wireless node is by step 7) the described assessment result that obtains is by being wirelessly transmitted to base station, the comprehensive whole described assessment result in described base station carries out Fatigue Life Assessment to whole bridge, and described assessment result is sent to Surveillance center by network.
Compared with prior art, the beneficial effect that the present invention has is:
The present invention is based on steel bridge fatigue life-span portable evaluating system and the method for intelligent wireless node, adopt wireless transmission method, avoid on-the-spot bracing wire, installation work, be easy to install and do not affect the normal operation of bridge; Intelligent wireless intra-node embeds Fatigue Assessment algorithm, the a large amount of raw data gathered can process at intra-node, and net result can be sent to base station, thus ensure that the data volume of wireless transmission significantly reduces, ensure that data are without loss on the one hand, save energy consumption on the other hand; The multiple strain acquirement module of each intelligent wireless Joint Enterprise, the data that comprehensive multiple strain module gathers, can utilize multiple method to calculate the focus stress of structure, meet the multifarious requirement of method of testing; Wireless intelligent network can gather the strain information at steel bridge different structure place simultaneously, the different assessment results of comprehensive multiple structure, can more effectively assess the whole steel bridge fatigue life-span; The present invention not only may be used for the Fatigue Assessment of steel bridge, is also applicable to for a long time by the Fatigue Life Assessment of the skyscraper of Wind effects.
Accompanying drawing explanation
Fig. 1 is the structural representation of the steel bridge fatigue life-span portable evaluating system that the present invention is based on intelligent wireless node.
Fig. 2 is the front end acquisition module structural drawing of the steel bridge fatigue life-span portable evaluating system that the present invention is based on intelligent wireless node.
Fig. 3 is the intelligent wireless node structure figure of the steel bridge fatigue life-span portable evaluating system that the present invention is based on intelligent wireless node.
Fig. 4 is the architecture of base station figure of the steel bridge fatigue life-span portable evaluating system that the present invention is based on intelligent wireless node.
Fig. 5 is the tired algorithm evaluation flow process of the steel bridge fatigue life-span portable appraisal procedure that the present invention is based on intelligent wireless node.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the present invention is based on the steel bridge fatigue life-span portable evaluating system of intelligent wireless node, comprise some intelligent wireless nodes, base station and Surveillance center.
The steel bridge of large span often subjects the excitation of multiple external environment, as vehicle-mounted, wind carries, ship collision etc., and for subject for a long time vehicle-mounted, wind carry this lower than material yield point loop cycle load, the easy permanent accumulated damage producing local, cracks or occurs to rupture completely after certain cycle index.Such structural damage fracture is sudden often, seldom have emissary in advance, but the loss brought is huge.
Therefore, at the critical area of steel bridge, welded structure place must be generally, arrange that some intelligent wireless nodes are used for gathering the stress that produces at structure place of load, and assess this welded fatigue lifetime at intra-node.Mode with wireless transmission is sent to base station by the assessment result that each intelligent wireless node draws, the assessment result later evaluation of base station each node comprehensive goes out the fatigue lifetime of whole steel bridge.Net result can be sent to Surveillance center by network switching unit in the mode of IP network.Surveillance center personnel carry out maintenance and management to steel bridge targetedly according to result.
As shown in Figure 2, intelligent wireless node comprises multiple front end acquisition module, the first data processing unit, the first wireless transceiver, the first high-gain aerial and power supply unit.
Front end acquisition module comprises strainometer, Wheatstone bridge, adjustable amplifying circuit, four-way analog to digital converter, frequency overlapped-resistable filter able to programme and digital output interface.
The structural strain information that strainometer collection in front end acquisition module is caused by extraneous load, is converted to voltage signal by Wheatstone bridge.Voltage signal is herein very small, has to pass through adjustable amplifying circuit and amplifies, and enlargement factor need mate the input requirements of analog to digital converter.Signal after amplification with some noises toward contact, therefore must utilize frequency overlapped-resistable filter to carry out filtering, export finally by digital interface.The analog to digital converter of four-way can allow external four stress gauges, and multiple method can be adopted like this to calculate welded focus stress.Frequency overlapped-resistable filter able to programme can set different sampling rate and cutoff frequency with satisfied different testing requirement according to actual conditions.
First data processing unit comprises the high-performance processor of embedded estimating method for fatigue life, mass storage, input interface and output interface.Mass storage is 32MB FLASH, and the strain raw data that intelligent wireless node collects can be pre-stored in FLASH, after assessment, result is directly sent to base station by analysis.Ensure that wirelessly transmitting data amount significantly reduces on the one hand, the mass data avoiding multiple node on the other hand sends to base station (easy packet loss) simultaneously.
First wireless transceiver adopts Zig-bee agreement, meets the data communication in 2.4GHz frequency range, and provides 16 passage bridge to ensure not disturb by other wireless signals.
The power supply unit of intelligent wireless node is multiple front end acquisition module as shown in Figure 3, the first data processing unit and the first wireless transceiver power.Power supply unit adopts compact power to power, as high-capacity lithium battery or dry cell.Each intelligent wireless node all adopts the miniature electronic components and parts of low-power consumption, can meet and work long hours, and volume is very little simultaneously, and be easy to install, it is convenient to change.Meanwhile, all right handoff processor frequency of operation (13MHz ~ 416MHz) of each intelligent wireless node, thus save energy to greatest extent.
Digital output interface in front end acquisition module is connected with the input interface on data processing unit.Output interface on data processing unit is connected with the first wireless transceiver.First wireless transceiver is connected with the first high-gain aerial.
As described in Figure 4, base station comprises some second high-gain aerials, some second wireless transceivers, the second data processing unit and network switching unit.Second wireless transceiver and the first wireless transceiver one_to_one corresponding, and the first wireless transceiver is by the first high-gain aerial and the second high-gain aerial and second transceiver wireless connections.Second wireless transceiver is connected with the second data processing unit.Second data processing unit comprises high-performance processor, the mass storage of embedded comprehensive estimating method for fatigue life.Second data processing unit is connected with Surveillance center network by network switching unit.
As shown in Figure 5, the steel bridge fatigue life-span portable appraisal procedure that the present invention is based on intelligent wireless node is compiled into code and is embedded in intelligent wireless node, this appraisal procedure comprises the following steps:
1) easily be there are tired some pads at steel bridge in some intelligent wireless inserting knot;
2) strain data of front end acquisition module collection caused by external environment encourages on described intelligent wireless node, and strain data is removed noise;
3) the first data processing unit on described intelligent wireless node is by step 2) the described strain data that obtains after filtering is converted to stress course.Usually can have been come by the elastic modulus being multiplied by material, formula is as follows,
σ＝E*ε
Wherein σ is stress, and ε is strain, and E is the elastic modulus of material.
4) the first data processing unit on described intelligent wireless node, the stress amplitude under utilizing rain flow method calculating external environment to encourage and the cycle index of its correspondence;
5) the first data processing unit on described intelligent wireless node, utilizes mathematical statistics analysis, determines the average daily standard stress spectra under external environment excitation;
6) the first data processing unit on described intelligent wireless node is according to corresponding welding node details, and determine the standard S-N curve of welding node, formula is as follows,
N*S
m＝K
0*Δ
d
Wherein K
0, Δ, m, d are constant, and S is stress amplitude, and N is the cycle index under corresponding tired occurrence condition.
7) the first data processing unit on described intelligent wireless node utilizes Miner criterion to calculate the fatigue lifetime of welding node, and obtain assessment result, formula is as follows,
Wherein n
irepresent the cycle index of i-th stress amplitude utilizing rain flow way to calculate, N
irepresent the cycle index under the tired occurrence condition of the equal stress amplitude obtained according to standard S-N curve, S is less than for a large amount of
0stress amplitude, need to be multiplied by decay factor λ
i, λ
ican obtain according to following formula,
λ
i＝(S
i/S
0)
2，S
i＜S
0
λ
i＝1，S
i≥S
0
Wherein S
0for the stress threshold values of welding node.
8) each described intelligent wireless node is by step 7) obtain each intelligent wireless node assessment result be sent to base station by wireless unification, the comprehensive whole described assessment result in base station carries out Fatigue Life Assessment to whole bridge, final assessment result can be sent to Surveillance center by network switching unit with IP access mode, for operating administration reference.
Claims (2)
1. based on the steel bridge fatigue life-span portable evaluating system of intelligent wireless node, it is characterized in that, comprise some intelligent wireless nodes, base station and Surveillance center;
Described intelligent wireless node comprises multiple front end acquisition module, the first data processing unit, the first wireless transceiver, the first high-gain aerial and power supply unit; Described front end acquisition module comprises strainometer, Wheatstone bridge, adjustable amplifying circuit, four-way analog to digital converter, frequency overlapped-resistable filter able to programme and digital output interface; Described first data processing unit comprises the high-performance processor of embedded estimating method for fatigue life, mass storage, input interface and output interface; Described digital output interface in described front end acquisition module is connected with the input interface on described data processing unit; Described output interface on described data processing unit is connected with described first wireless transceiver; Described first wireless transceiver is connected with described first high-gain aerial; Described power supply unit is described multiple front end acquisition module, described first data processing unit and described first wireless transceiver are powered;
Described base station comprises some second high-gain aerials, some second wireless transceivers, the second data processing unit and network switching unit; Described second wireless transceiver and described first wireless transceiver one_to_one corresponding, and described first wireless transceiver is by described first high-gain aerial and described second high-gain aerial and described second transceiver wireless connections; Described second wireless transceiver is connected with described second data processing unit; Described second data processing unit comprises high-performance processor, the mass storage of embedded comprehensive estimating method for fatigue life; Described second data processing unit is connected with described Surveillance center network by described network switching unit.
2., based on the steel bridge fatigue life-span portable appraisal procedure of intelligent wireless node, it is characterized in that, comprise the following steps:
1) easily be there are tired some pads at steel bridge in some intelligent wireless inserting knot;
2) strain data of front end acquisition module collection caused by external environment encourages on described intelligent wireless node, and strain data is removed noise;
3) the first data processing unit on described intelligent wireless node is by step 2) the described strain data that obtains after filtering is converted to stress course;
4) the first data processing unit on described intelligent wireless node, the stress amplitude under utilizing rain flow method calculating external environment to encourage and the cycle index of its correspondence;
5) the first data processing unit on described intelligent wireless node, utilizes mathematical statistics analysis, determines the average daily standard stress spectra under external environment excitation;
6) the first data processing unit on described intelligent wireless node, according to corresponding welding node details, determines the standard S-N curve of welding node;
7) the first data processing unit on described intelligent wireless node utilizes Miner criterion to calculate the fatigue lifetime of welding node, obtains assessment result;
8) each described intelligent wireless node is by step 7) the described assessment result that obtains is by being wirelessly transmitted to base station, the comprehensive whole described assessment result in described base station carries out Fatigue Life Assessment to whole bridge, and described assessment result is sent to Surveillance center by network.
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| CN110926976A (en) * | 2019-12-09 | 2020-03-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Evaluation method for service life gain after three-dimensional additive repair |
| CN111241693A (en) * | 2020-01-16 | 2020-06-05 | 华东理工大学 | Life prediction system based on fatigue accumulation hypothesis |
| CN116542111A (en) * | 2023-05-23 | 2023-08-04 | 中铁二十三局集团轨道交通工程有限公司 | Health monitoring method and system for connecting node structure of assembled house building |
| CN116542111B (en) * | 2023-05-23 | 2024-05-03 | 中铁二十三局集团轨道交通工程有限公司 | Health monitoring method and system for connecting node structure of assembled house building |
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| CN110926976A (en) * | 2019-12-09 | 2020-03-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Evaluation method for service life gain after three-dimensional additive repair |
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| CN111241693B (en) * | 2020-01-16 | 2024-04-09 | 华东理工大学 | Life prediction system based on fatigue accumulation hypothesis |
| CN116542111A (en) * | 2023-05-23 | 2023-08-04 | 中铁二十三局集团轨道交通工程有限公司 | Health monitoring method and system for connecting node structure of assembled house building |
| CN116542111B (en) * | 2023-05-23 | 2024-05-03 | 中铁二十三局集团轨道交通工程有限公司 | Health monitoring method and system for connecting node structure of assembled house building |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 210020, No. 359, Jiangdong Middle Road, Jianye District, Jiangsu, Nanjing (2 floor, B building, No.1 building, CBD) Applicant after: NANJING JIASHI ELECTRONIC CO., LTD. Applicant after: JIANGSU GENTURE ELECTRONIC INFORMATION SERVICE CO., LTD. Address before: 210020, No. 359, Jiangdong Middle Road, Jianye District, Jiangsu, Nanjing (2 floor, B building, No.1 building, CBD) Applicant before: NANJING JIASHI ELECTRONIC CO., LTD. Applicant before: NANJING GENTURE ELECTRONIC INFORMATION CO., LTD. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150107 |