CN102269586B - Method for real-time monitoring on non-uniform settlement of crane rail of bridge type crane - Google Patents
Method for real-time monitoring on non-uniform settlement of crane rail of bridge type crane Download PDFInfo
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- CN102269586B CN102269586B CN 201110165236 CN201110165236A CN102269586B CN 102269586 B CN102269586 B CN 102269586B CN 201110165236 CN201110165236 CN 201110165236 CN 201110165236 A CN201110165236 A CN 201110165236A CN 102269586 B CN102269586 B CN 102269586B
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Abstract
The invention discloses a method for the real-time monitoring on the non-uniform settlement of a crane rail of a bridge type crane, which comprises the following steps: 1) acquiring a real-time angle vibration signal in an online manner when a girder is laid down, performing noise reduction and ultra-low-frequency time-frequency characteristic analysis, then performing wavelet packet decomposition signal processing, and acquiring an angle vibration characteristic signal which is almost caused by the height difference of the crane rail; and 2) calculating the height difference of the crane rail based on a formula dealt A=alpha (C-C0) according to the actually measured angle value of the girder obtained in the step 1). By adopting the technical scheme, the invention realizes the automated monitoring on the non-uniform settlement state of the crane rail and improves the safety; and the method simultaneously has the advantages of real-time monitoring and predictability.
Description
Technical field
This invention relates to a kind of for measuring in real time the poor new technology of bridge crane rail height, is specially a kind of bridge crane track non-uniform settling method of real-time.
Background technology
All will reach decades designed life of general port and pier and hoisting device thereof.Very easily cause the non-uniform settling of the large Car Track of bridge crane of laying on harbour and harbour due to the variation of geologic structure, dock structure, load characteristic and regional land subsidence etc. within the so permanent time.The harbour non-uniform settling can have influence on the overhead travelling crane safe operation of harbour and upper operation thereof.When the harbour state was normal, the difference of height that is laid on (extra large land side) the large Car Track on harbour should remain in certain scope, when surpassing the ultimate value that allows, will normal operation and even the safety of overhead travelling crane be impacted.
Each GangWu Co., Ltd common regularly (as annual or cycle longer time) measures the harbour levelness and grasps harbour sedimentation state at present, thereby comes quantitative test and the difference of height of grasping large Car Track and the variation tendency of harbour non-uniform settling thereof.This traditional detection means exist and too much rely on manpower and the poor shortcoming of real-time, and in-site measurement work meeting is subject to the impact of harbour applying working condition, and testing intensity is large, and security is also relatively poor.This has also caused the cycle of existing periodic measurement also very long, making overhead travelling crane to work long hours surpasses on the large Car Track of the ultimate value that allows at difference of height, thereby have influence on the health status of crane, the serviceable life that if things go on like this can shorten it even occurs safety problem.
Summary of the invention
For above-mentioned problems of the prior art, the present invention proposes a kind of method of non-uniform settling of on-line real time monitoring bridge crane track, can in time grasp the non-uniform settling information of harbour and real-time variation tendency thereof.
Technical scheme of the present invention is as follows:
Bridge crane track non-uniform settling method of real-time is characterized in that, comprises the following steps:
Real-time angular vibration signal when the crossbeam that 1) obtains online puts down, and carry out noise reduction and ultralow frequency Time-frequency Analysis, then carry out the WAVELET PACKET DECOMPOSITION signal and process, obtain almost by the poor caused angular vibration characteristic signal of cart rail height;
2) according to step 1) the middle crossbeam actual measurement angle value that obtains, by formula Δ A=α (C-C
0) to try to achieve the cart rail height poor, wherein Δ A is that the cart rail height is poor, C is actual measurement crossbeam angle value, C
0Be 0 o'clock corresponding crossbeam angle value for the cart rail height is poor, α is the poor sensitivity of rail height, α and C
0For obtaining in advance by the following method: overhead travelling crane is parked in certain fixed position, recording angular signal value C, use spirit-leveling instrument to measure this sea, position, land side cart rail levelness, calculate the poor Δ A of cart rail height, repeat above step, obtain C value and the Δ A value of overhead travelling crane under three diverse locations, utilize least square method to carry out fitting a straight line, according to formula α=Δ A/ (C-C
0) obtain the poor sensitivity α of corresponding rail height and C
0
The present invention is according to the NetCMAS system characteristics in the angular vibration sensing of crossbeam front end, and in the working method in conjunction with overhead travelling crane, while is based on the feature of real-time angular vibration, after extracting the inhomogeneous characteristic signal of large Car Track, it is demarcated, make calibrated signal intuitively characterize cart rail height difference value, be the state of non-uniform settling, thereby realized the large Car Track of online Real-Time Monitoring or harbour non-uniform settling and variation tendency thereof.
The present invention compared with prior art has following beneficial effect: realized the robotization to large Car Track non-uniform settling condition monitoring, can improve and improve efficient and the automaticity of existing regular hand inspection, save a large amount of manpower and materials, avoided the implicit insecurity of in-site measurement; Have advantages of real-time, can help the field engineer in time to find and control harbour non-uniform settling and variation tendency thereof; By a large amount of data accumulations, can predict large Car Track to-be, in order to take timely the maintain and repair methods measure, can better guarantee the normal use of overhead travelling crane safety work and harbour, can prevent by the alarm, brake device generation of corresponding accident simultaneously.
Description of drawings
Fig. 1 is crossbeam angular transducer signal waveforms before overhead travelling crane.
Fig. 2 is that before overhead travelling crane, crossbeam puts down signal waveforms.
Fig. 3 is that the front crossbeam of overhead travelling crane puts down signal except making an uproar rear oscillogram.
Fig. 4 is that the front crossbeam of overhead travelling crane puts down signal except making an uproar the poor signature waveform figure of rear rail height.
Fig. 5 is the poor calibration principle figure of rail height.
Fig. 6 is least square fitting straight line result.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete accompanying drawing, further set forth the present invention.
When before overhead travelling crane, crossbeam puts down, cart rail height missionary society causes the change of crossbeam luffing angle, to be loaded on crossbeam angular transducer energy real embodiment crossbeam luffing angle foremost in order making, to need carry out the signals processing such as noise reduction, WAVELET PACKET DECOMPOSITION to the sophisticated signal of sensor output.
As shown in Figure 1, two states is packed up and put down to crossbeam before overhead travelling crane, and from the poor consideration of research cart rail height, when we only extract crossbeam shown in Figure 2 and put down, angle signal carries out next step analysis; Real-time angular vibration signal when crossbeam is put down adopts the wavelet packet Threshold Noise Reduction Methods to carry out noise reduction process, and result as shown in Figure 3; Angle signal after noise reduction has abundant multicharacteristic information, comprised wherein that the cart rail height is poor, the characteristic informations such as overhead travelling crane self vibration and off working state thereof, vibration characteristic when each leisure is worked according to them can therefrom extract because of harbour sea side and the slow variation characteristic signal of the poor crossbeam angle that causes of land side cart rail height, so this characteristic signal mainly is comprised of the ultra-low frequency constituent.Job state signal after noise reduction is carried out 6 layers of WAVELET PACKET DECOMPOSITION, obtain 2
6=64 frequency ranges, and the wavelet packet coefficient under each yardstick is reconstructed, and according to being arranged to high band by low-frequency range, corresponding yardstick is designated as d1, and d2, d3 ..., d64.Try to achieve the signal energy under each yardstick, the signal energy computation formula under yardstick i is
Wherein N represents data length, and j represents the row mark of corresponding data.Through calculating, we can draw signal energy and mainly concentrate on the d1 magnitude signal, signal after utilizing analysis method of wavelet packet to noise reduction carries out many feature extractions, angle signal after noise reduction is carried out many feature extractions, and therefrom obtain and shown in Figure 4 almost cause the angular vibration signal by cart rail height poor institute.
By the demarcation to angle signal, can directly calculate the poor information of cart rail height.So must carry out for measurand the calibrated and calculated of in-site measurement and sensitivity before using method of the present invention.At first define the poor sensitivity α of rail height, α=Δ A/ (C-C
0), wherein Δ A is the rail height difference, C is actual measurement crossbeam angle value, C
0Crossbeam angle value for the correspondence when the Δ A=0.α represents the once variable quantity of respective carter difference of height of the every variation of angle.Under perfect condition, when the crossbeam inclination angle is 0 °, corresponding track difference of elevation is 0, but in reality, and because the installation of overhead travelling crane crossbeam and sensor is not often horizontal positioned, making the cart rail height poor be that 0 o'clock corresponding angle exists is not the initial value C of 0 °
0
The poor calibration principle of rail height carries out as shown in Figure 5 as follows:
1) overhead travelling crane is parked in certain fixed position, the recording angular signal value is designated as C;
2) use spirit-leveling instrument to measure this sea, position, land side cart rail levelness, calculate the cart rail height poor, be designated as Δ A;
3) repeat above step, obtain C value and the Δ A value of overhead travelling crane under three diverse locations, see Table 1, and utilize least square method to carry out fitting a straight line, obtain the poor sensitivity α of corresponding rail height and C
0, as shown in Figure 6, concrete computing method are as follows:
If the straight-line equation general formula is y=kx+b, return results k ≈ 0.3 after match, b ≈-4.6.Straight-line equation shown in Figure 6 is Δ A=0.3C-4.6, therefore can draw the poor sensitivity α of rail height=0.3, and then can obtain corresponding C when Δ A is 0
0=15.3.
Can obtain cart rail height corresponding to different angles according to the formula Δ A=0.3C-4.6 that obtains poor.
Three diverse location lower angle signals of table 1 and the poor corresponding table of cart rail height
| ΔA(mm) | -8 | -6 | -10 |
| C(°) | -10 | -6 | -19 |
Below by concrete case check analysis the inventive method:
Overhead travelling crane is parked in respectively 3 fixed positions, the angle value that the read sensor signal shows, record sees Table 2, and use spirit-leveling instrument measurement correspondence position is extra large, land side cart rail levelness, calculate the cart rail height poor, compare with the result that obtains as reference and the inventive method.Adopt the inventive method to carry out signal and process and demarcate, calibration result sees Table 3.Calibration result and measured result are analyzed, and analysis result sees Table 4.
3 position lower angle sensor signals of table 2
Table 3 is demarcated rear 3 position rail heights poor (Δ A=0.3C-4.6)
| C(°) | -8 | -9 | -7 |
| ΔA(mm) | -7 | -7.3 | -6.7 |
The poor comparison poor with demarcating rail height of table 4 actual measurement rail height
| The harbour label | Actual measurement track poor (mm) | Demarcate track poor (mm) | Relative error |
| 4090 | -7 | -7 | 0.00％ |
| 4088 | -8 | -7.3 | -8.75％ |
| 4086 | -7 | -6.7 | -4.29％ |
We can find out from table 4, the cart rail height of same position poor by the actual value that records of spirit-leveling instrument and the value relative error maximal value that obtains after demarcating by the present invention be no more than 10%, have practical implementation and be worth.
The present invention has realized the Real-Time Monitoring to the poor status flag information of cart rail height, for the poor measurement of cart rail height provides a kind of intelligence, real-time new method, can better guarantee the safety work of overhead travelling crane.
Above demonstration and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and instructions just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (1)
1. bridge crane track non-uniform settling method of real-time, is characterized in that, comprises the following steps:
1) obtain online real-time angular vibration signal when crossbeam puts down before overhead travelling crane, and carry out noise reduction and ultralow frequency Time-frequency Analysis, then carry out the WAVELET PACKET DECOMPOSITION signal and process, obtain almost by the poor caused angular vibration characteristic signal of cart rail height;
2) according to the crossbeam actual measurement angle value that obtains in step 1), by formula Δ A=α (C-C
0) to try to achieve the cart rail height poor, wherein Δ A is poor for actual measurement cart rail height, and C is actual measurement crossbeam angle value, C
0Be 0 o'clock corresponding crossbeam angle value for the cart rail height is poor, α is the poor sensitivity of rail height, and the expression angle changes the once variable quantity of respective carter difference of height, α and C
0For obtaining in advance by the following method: overhead travelling crane is parked in certain fixed position, recording angular signal value C, use spirit-leveling instrument to measure this sea, position, land side cart rail levelness, calculate the poor Δ A of cart rail height, repeat above step, obtain C value and the Δ A value of overhead travelling crane under three diverse locations, utilize least square method to carry out fitting a straight line, according to formula α=Δ A/ (C-C
0) obtain the poor sensitivity α of corresponding rail height and C
0
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110165236 CN102269586B (en) | 2011-06-17 | 2011-06-17 | Method for real-time monitoring on non-uniform settlement of crane rail of bridge type crane |
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|---|---|---|---|
| CN 201110165236 CN102269586B (en) | 2011-06-17 | 2011-06-17 | Method for real-time monitoring on non-uniform settlement of crane rail of bridge type crane |
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| CN102269586B true CN102269586B (en) | 2013-05-22 |
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| CN106092015B (en) * | 2016-05-27 | 2018-07-03 | 南京理工大学 | A kind of raceway surface recess length detecting method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160643Y (en) * | 1993-03-23 | 1994-04-06 | 上海宝山钢铁总厂 | Horizontal positioner for bridge crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20080078653A (en) * | 2006-02-15 | 2008-08-27 | 가부시키가이샤 야스카와덴키 | Device for preventing sway of suspended load |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160643Y (en) * | 1993-03-23 | 1994-04-06 | 上海宝山钢铁总厂 | Horizontal positioner for bridge crane |
Non-Patent Citations (3)
| Title |
|---|
| 吴广继.港口门机沉降问题的解决方案.《港工技术》.2005,(第3期),50-51. * |
| 胡晓依,吕凤梧,徐伟.基坑水平支撑受移动荷载作用的竖向随机振动分析.《建筑技术》.1999,第30卷(第2期),84-86. * |
| 贺有，高立志.桥式起重机啃轨故障的分析与消除方法.《钢铁研究》.2002,(第6期),32-34. * |
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