CN107391800A - A kind of real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process - Google Patents

A kind of real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process Download PDF

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CN107391800A
CN107391800A CN201710483686.8A CN201710483686A CN107391800A CN 107391800 A CN107391800 A CN 107391800A CN 201710483686 A CN201710483686 A CN 201710483686A CN 107391800 A CN107391800 A CN 107391800A
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mtd
msub
steel truss
coordinate
mrow
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CN107391800B (en
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胡德军
黄铭枫
张柏岩
吴利泽
张永光
王帅
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Zhejiang Yaosha Holding Group Co Ltd
Zhejiang University ZJU
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Zhejiang Yaosha Holding Group Co Ltd
Zhejiang University ZJU
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation
    • G06F30/23Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/08Construction

Abstract

The invention discloses a kind of real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process.Compared with the monitoring method during traditional steel truss hydraulic pressure lift, method provided by the present invention has advantages below:(1)Overcome and be difficult to the defects of dynamic realtime monitors using traditional coordinate monitoring method such as spirit level, total powerstation and theodolite, it is possible to achieve the dynamic realtime monitoring of steel truss hydraulic pressure lift overall process;(2)Compared to traditional monitoring device, once computer vision monitoring and identifying system are set up and finished, the coordinate data of multiple target monitoring points is obtained while just can quickly, without repeatedly operation, that is, manpower is saved and improves efficiency again;(3)By real-time data transfer and finite element model analysis, real-time steel truss stress distribution cloud atlas can be obtained, danger early warning function has then ensured the security in lifting process;(4)Compared to other method, meet high accuracy, high efficiency, the site operation demand of low cost.

Description

A kind of real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process
Technical field
The invention belongs to building field, is monitored more particularly, to a kind of real-time dynamic stress of steel truss hydraulic pressure lift overall process Method.
Background technology
Long-Span Steel Space Structures are as a kind of various informative, attractive in appearance economic structure type, in the design of public building In be widely adopted.At the same time, the unique complicated structure type of long span steel structure also brings opportunity to site operation And challenge.
Compared in general steel structure member, there can be the problem of certain in hoisting process across steel truss greatly:(1) it is stable Sex chromosome mosaicism:Steel truss rotation easily occurs in hoisting process, deviates the problem of lifting displacement, so as to cause component quickly accurate True lifting is in place;(2) workload is excessive:Due to the limitation of crane tonnage, often need to carry out height using the method for lifting construction Empty assembly welding, increase workload and very big safety, hidden danger of quality be present.
The method that long span steel structure hydraulic pressure is integrally lifted overcomes the deficiency of construction method for hanging, in long-span space steel It is widely used in structure construction procedure.In steel truss hydraulic pressure entirety lifting process, each hoist point needs to keep real When it is synchronous, to reduce the asynchronous influence for lifting the additional stress brought to steel truss and support bracket, thus, in lifting process It is middle to need to carry out whole working condition scene monitoring in real time.
In traditional hydraulic pressure lift monitoring scheme, lifted by a small margin first and stagnate 24h observation pillars and steel in the air The deformation of truss;Then slowly lifted, at regular intervals using total powerstation, spirit level, longitude and latitude in lifting process The displacement to hoist point such as instrument, absolute altitude are monitored, and stress monitoring is carried out to emphasis monitoring portion position using strain gauge.This method Although can meet the needs of construction, poor in timeliness, manpower and materials consumption is more during multiple spot monitoring, it is difficult to realizes dangerous in time Early warning is to tackle urgent emergency case.
Computer vision technique is an emerging subject, and vision technique can obtain one by the analysis to video image A little desirable important informations.In construction field, vision technique can pass through one or more camera and a computer Realize the tracking of multipoint targets, coordinate obtains and deformation monitoring.Its untouchable, high efficiency, real-time and multiple target monitoring The advantages of can effectively be used in steel truss lifting process.
Real-time finite element analysis can obtain compared to traditional analysis according to the structural deformation conditions of reality, analysis The real-time stress distribution of structure.
The content of the invention
It is an object of the present invention in terms of in order to solve the problems, such as following three:
(1) will be difficult to monitor in real time using total powerstation, spirit level, theodolite etc. during steel truss hydraulic pressure lift, Dynamic tracking and the deformation measurement of steel truss hydraulic pressure lift overall process can not be realized;
(2) workload that conventional method needs multiple measurement to obtain multiple spot position coordinates is larger, can not realize automatically Tracking measurement while multi-point displacement, the manpower and materials cost of field monitoring is wasted significantly;
(3) monitoring that the real-time stress distribution in each position of steel truss structure is difficult to during steel truss hydraulic pressure lift is asked Topic, the real-time output of steel truss Stress Map can not be realized, and various structure unfavoured states can not be directed to and carry out early warning and scheme Adjustment;
And provide a kind of steel truss hydraulic pressure lift overall process real-time dynamic stress monitoring method.
Therefore, the above-mentioned purpose of the present invention is achieved through the following technical solutions:
The first step:According to design document steel truss hydraulic pressure lift finite element is established in ANSYS with the method for command stream Model, generation is comprising element number, cell node coordinate, unit material information, elementary boundary condition and can be introduced directly into ANSYS Carry out the template txt file of finite element analysis;
Second step:Position is monitored using the node of each unit of steel truss in FEM model as emphasis, is checked every The actual coordinate data of individual cell node, and correspondence position is found out on constructing steel truss at the scene;
3rd step:The Computer Vision Recognition system for monitoring in real time is established in the job site of steel truss hydraulic pressure lift System, is specifically included:
1) mark for being printed on 2 × 2 chequered with black and white grids, root are pasted on the emphasis monitoring position of constructing steel truss at the scene According to the construction environment at scene, the installation position of camera is determined, and ensure that steel truss is all located at camera in whole lifting process Within sweep of the eye and mark can clearly be caught by camera;
2) from scaling board of the flat board as camera for being printed on chequered with black and white grid, using ZhangShi standardizations to phase Machine carries out plane reference, establishes the relation that target point is changed from image pixel coordinates to real world coordinates:
Sm=HM=A [r1 r2 t]M (1)
M=[x y 1]T (2)
M=[X Y 1]T (3)
R=[r1 r2 r3] (4)
M is 3 × 1 expansion coordinates matrixs of the target point under image pixel coordinates system in formula, and x, y are respectively that target point is being schemed The pixel coordinate of image plane both direction;M is 3 × 1 expansion coordinates matrixs of the target point under world coordinate system, and X, Y are respectively The coordinate of both direction on the alive boundary plane of target point;H is 3 × 3 mapping matrix, reflects image pixel coordinates system and the world The coordinate corresponding relation of coordinate system;A is the internal reference matrix of 3 × 3 camera, and A will not move with camera under same camera fixed focal length Move, rotate and change;R is camera coordinates system relative to 3 × 3 Rotation matrix of world coordinate system, r1、r2And r3Respectively R Middle first row, secondary series and the column vector of the 3rd row 3 × 1;T is that camera coordinates system translates square relative to the 3 × 1 of world coordinate system Battle array;[r1r2T] it is to join matrix, wherein r outside the 3 × 3 of camera1And r2Respectively R first, second column element;S is a size system Number, can be by h31X+h32Y+h33Try to achieve;
3) before steel truss hydraulic pressure lift starts, identified by Shi-Tomas Feature Points Matching algorithms 2 in mark The central point of × 2 chequered with black and white grids is accurately positioned as steel truss emphasis monitoring position:
W (x, y)=exp [- (x2+y2)/2σ2] (8)
min(λ12) > c (9)
X in formula, y are the pixel coordinate of any on image;P be and a certain pixel (xi, yi) corresponding to 2 × 2 symmetrical squares Battle array;I is with (xi, yi) centered on 3 × 3 pixel window;IxAnd IyRespectively ashes of the pixel window I in x directions and y directions Spend Grad;W (x, y) is the weight coefficient corresponding to window I, and σ is the root mean square of all pixels gray value in pixel window I; λ1And λ2For matrix P two characteristic roots;C is a constant;
Scene adjustment constant c value, when only having unique pixel (x in mark object areac0, yc0) meet matrix P two When characteristic value is both greater than c, then (xc0, yc0) it is that steel truss emphasis monitors accurate coordinates of the position on image.Utilize formula (1) Transformational relation between middle image pixel coordinates and real world coordinates, obtain the steel truss emphasis monitoring alive boundary's coordinate system in position Under coordinate (Xc0, Yc0):
(1/s) M=H-1m (10)
H in formula-1For 3 × 3 mapping matrix H inverse matrix;
4) in steel truss hydraulic pressure lift overall process, the position that template matches track algorithm obtains each mark in real time is first passed through Put, then each emphasis monitoring position is obtained with Shi-Tomas Feature Points Matchings algorithm and coordinate transform in object area is indicated Real-time coordinates under world coordinate system, the coordinate of t are designated as (Xct, Yct);
5) changes in coordinates at t emphasis monitoring position is calculated:
(ΔXct,ΔYct)=(Xct-Xc0,Yct-Yc0) (11)
Δ X in formulactWith Δ YctEmphasis monitors position in X-direction and Y direction respectively under t world coordinate system Changes in coordinates value;
, it is necessary to test in advance camera and computer, to ensure that camera can be gathered clearly before field monitoring Image, and computer possesses the ability of real-time processing data.At the scene in monitoring process, it should try one's best and avoid target monitoring point from being hidden The situation of gear, to ensure that data continuously, can be recorded accurately.Pay attention to camera shake caused by avoiding any environmental factor, if Camera should then stop monitoring immediately because the reasons such as collision produce larger shift in position, and update the system parameter in time, rear The lifting and monitoring of steel truss can be restarted.
4th step:With (Δ Xct, Δ Yct) as t emphasis monitor position increment of coordinate change template txt file In corresponding cell node coordinate, obtain the txt file of t;
5th step:The txt file of t is imported in ANSYS and carries out finite element analysis, steel truss is exported in analysis result The stress value of frame stress distribution cloud atlas and unit, and calculate stress axis:
K=σeiiMax (12)
K is unit i stress ratio in formula;σeiFor unit i true stress;σiMaxFor unit i allowable stresses;Work as k> When 0.9, then provide pre-warning signal and targetedly adjust steel truss lifting scheme with reference to stress distribution situation.
Compared with the monitoring method during traditional steel truss hydraulic pressure lift, steel truss hydraulic pressure provided by the present invention carries Rising the real-time dynamic stress monitoring method of overall process has advantages below:
(1) overcome and be difficult to dynamic realtime using traditional coordinate monitoring method such as spirit level, total powerstation and theodolite The defects of monitoring, it is possible to achieve the dynamic realtime monitoring of steel truss hydraulic pressure lift overall process;
(2), just can be fast once computer vision monitoring and identifying system are set up and finished compared to traditional monitoring device The coordinate data of multiple target monitoring points is obtained while fast, without repeating operation, that is, manpower is saved and improves efficiency again;
(3) by real-time data transfer and finite element model analysis, real-time steel truss stress distribution cloud can be obtained Figure, danger early warning function have then ensured the security in lifting process;
(4) compared to other method, high accuracy, high efficiency, the site operation demand of low cost are met.
Brief description of the drawings
Fig. 1 is a kind of scene of the real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process provided by the present invention Monitor schematic diagram;
In figure:1. it is steel truss in place to be hoisted;2. it is camera;3. it is camera calibration plate;4. it is mark;5. it is meter Calculation machine and data handling system;6. it is real-time steel truss FEM model.
Embodiment
The present invention is described in further detail with specific embodiment referring to the drawings.
Fig. 1 is that a kind of real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process provided by the invention is applied to one The case of stress monitoring during steel truss scene hydraulic pressure lift is in place, specific implementation comprise the following steps:
(1) design document according to the steel truss establishes steel truss hydraulic pressure lift in ANSYS with the method for command stream 6., generation includes element number, cell node coordinate, unit material information, elementary boundary condition and can be direct to FEM model The template txt file that ANSYS carries out finite element analysis is imported, is named as " steel truss finite element template model .txt ";
(2) using FEM model 6. each unit of middle steel truss node as emphasis monitor position, a total of 11 Individual node, i.e. 11 emphasis monitoring positions.Check the actual coordinate data of each cell node, and constructing steel truss is 1. at the scene On find out correspondence position;
(3) the Computer Vision Recognition system for monitoring in real time is established in the job site of steel truss hydraulic pressure lift, is had Body includes:
1) mark for being printed on 2 × 2 chequered with black and white grids is pasted on the emphasis monitoring position of constructing steel truss 1. at the scene 4. 1. steel truss during the whole hydraulic pressure lift of camera being placed in 2. is all located to the position within the vision of camera, and Test is carried out to camera to guarantee clearly to gather image;
2) from be printed on the flat board of chequered with black and white grid as camera scaling board 3., using ZhangShi standardizations pair Camera carries out plane reference, establishes the relation that target point is changed from image pixel coordinates to real world coordinates, solves 3 × 3 Mapping matrix H, and seek H inverse matrix H-1
3) before 1. hydraulic pressure lift starts steel truss, mark is identified by Shi-Tomas Feature Points Matching algorithms 4. as steel truss, 1. emphasis monitors being accurately positioned for position to the central point of 2 × 2 chequered with black and white grids in, remembers i-th of emphasis prison The accurate coordinates surveyed on the image at position are (xc0i, yc0i) (i=1,2 ..., 11).The m at each emphasis monitoring position is designated as [xc0i yc0i 1]T, M notes [Xc0i Yc0i 1]T.By the inverse matrix H of the mapping matrix obtained in 2)-1With each emphasis monitoring portion The m of position does matrix multiplication and obtains M, you can knows coordinate of the steel truss 1. under each emphasis monitoring alive boundary's coordinate system in position (Xc0i, Yc0i);
4) in steel truss 1. hydraulic pressure lift overall process, first pass through template matches track algorithm and obtain each mark in real time 4. Position, then obtain each emphasis monitoring with Shi-Tomas Feature Points Matchings algorithm and coordinate transform in mark 4. region Real-time coordinates under the world coordinate system at position, the coordinate at i-th of emphasis monitoring position of t are designated as (Xcti, Ycti);
5) changes in coordinates at t each emphasis monitoring position, i-th of emphasis monitoring two, position side of t are calculated To changes in coordinates be designated as Δ X respectivelyctiWith Δ Ycti
(4) with (Δ Xcti, Δ Ycti) as t the i-th emphasis monitor position increment of coordinate modification " steel truss is limited Corresponding cell node i coordinate, obtains the txt file of t, is named as " t_ steel truss in meta template model .txt " files FEM model .txt ";
(5) " finite element analysis will be carried out in t_ steel truss FEM model .txt " files importing ANSYS, in analysis result The stress value of middle output steel truss stress distribution cloud atlas and unit, and the stress ratio of each unit is calculated, remember i-th of list The stress ratio of member is ki.If there is ki>0.9 situation, then provide pre-warning signal and targetedly adjusted with reference to stress distribution situation Whole steel truss lifting scheme.
Above-mentioned embodiment is used for illustrating the present invention, only the preferred embodiments of the present invention, rather than to this Invention is limited, and in the protection domain of spirit and claims of the present invention, to any modification of the invention made, is equal Replace, improve etc., both fall within protection scope of the present invention.

Claims (1)

  1. A kind of 1. real-time dynamic stress monitoring method of steel truss hydraulic pressure lift overall process, it is characterised in that the steel truss hydraulic pressure The lifting real-time dynamic stress monitoring method of overall process includes:
    (1) steel truss hydraulic pressure lift FEM model is established with the method for command stream in ANSYS according to design document, generated Comprising element number, cell node coordinate, unit material information, elementary boundary condition and can be introduced directly into ANSYS carry out it is limited The template txt file of meta analysis;
    (2) position is monitored using the node of each unit of steel truss in FEM model as emphasis, checks each unit section The actual coordinate data of point, and correspondence position is found out on constructing steel truss at the scene;
    (3) the Computer Vision Recognition system for monitoring in real time is established in the job site of steel truss hydraulic pressure lift, specific step Suddenly include:
    (301) mark for being printed on 2 × 2 chequered with black and white grids, root are pasted on the emphasis monitoring position of constructing steel truss at the scene According to the construction environment at scene, the installation position of camera is determined, and ensure that steel truss is all located at camera in whole lifting process Within sweep of the eye and mark can clearly be caught by camera;
    (302) from scaling board of the flat board as camera for being printed on chequered with black and white grid, using ZhangShi standardizations to camera Plane reference is carried out, establishes the relation that target point is changed from image pixel coordinates to real world coordinates:
    Sm=HM=A [r1 r2 t]M (1)
    M=[x y 1]T (2)
    M=[X Y 1]T (3)
    R=[r1 r2 r3] (4)
    <mrow> <mo>&amp;lsqb;</mo> <mtable> <mtr> <mtd> <msub> <mi>r</mi> <mn>1</mn> </msub> </mtd> <mtd> <msub> <mi>r</mi> <mn>2</mn> </msub> </mtd> <mtd> <mi>t</mi> </mtd> </mtr> </mtable> <mo>&amp;rsqb;</mo> <mo>=</mo> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mi>r</mi> <mn>11</mn> </msub> </mtd> <mtd> <msub> <mi>r</mi> <mn>12</mn> </msub> </mtd> <mtd> <msub> <mi>t</mi> <mn>1</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>r</mi> <mn>21</mn> </msub> </mtd> <mtd> <msub> <mi>r</mi> <mn>22</mn> </msub> </mtd> <mtd> <msub> <mi>t</mi> <mn>2</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>r</mi> <mn>31</mn> </msub> </mtd> <mtd> <msub> <mi>r</mi> <mn>32</mn> </msub> </mtd> <mtd> <msub> <mi>t</mi> <mn>3</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
    <mrow> <mi>H</mi> <mo>=</mo> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mi>h</mi> <mn>11</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>12</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>13</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>h</mi> <mn>21</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>22</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>23</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>h</mi> <mn>31</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>32</mn> </msub> </mtd> <mtd> <msub> <mi>h</mi> <mn>33</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
    M is 3 × 1 expansion coordinates matrixs of the target point under image pixel coordinates system in formula, and x, y are respectively that target point is put down in image The pixel coordinate of face both direction;M is 3 × 1 expansion coordinates matrixs of the target point under world coordinate system, and X, Y are respectively target The coordinate of both direction on the alive boundary plane of point;H is 3 × 3 mapping matrix, reflects image pixel coordinates system and world coordinates The coordinate corresponding relation of system;A is the internal reference matrix of 3 × 3 camera, under same camera fixed focal length A will not it is mobile with camera, turn Move and change;R is camera coordinates system relative to 3 × 3 Rotation matrix of world coordinate system, r1、r2And r3In respectively R One row, secondary series and the column vector of the 3rd row 3 × 1;T is 3 × 1 translation matrix of the camera coordinates system relative to world coordinate system;[r1 r2T] it is to join matrix, wherein r outside the 3 × 3 of camera1And r2Respectively R first, second column element;S is a size factor, can By h31X+h32Y+h33Try to achieve;
    (303) before steel truss hydraulic pressure lift starts, identified by Shi-Tomas Feature Points Matching algorithms 2 in mark The central point of × 2 chequered with black and white grids is accurately positioned as steel truss emphasis monitoring position:
    <mrow> <mi>P</mi> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>x</mi> <mo>,</mo> <mi>y</mi> </mrow> <mi>I</mi> </munderover> <mi>W</mi> <mrow> <mo>(</mo> <mi>x</mi> <mo>,</mo> <mi>y</mi> <mo>)</mo> </mrow> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msubsup> <mi>I</mi> <mi>x</mi> <mn>2</mn> </msubsup> </mtd> <mtd> <mrow> <msub> <mi>I</mi> <mi>x</mi> </msub> <msub> <mi>I</mi> <mi>y</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mi>x</mi> </msub> <msub> <mi>I</mi> <mi>y</mi> </msub> </mrow> </mtd> <mtd> <msubsup> <mi>I</mi> <mi>y</mi> <mn>2</mn> </msubsup> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow>
    W (x, y)=exp [- (x2+y2)/2σ2] (8)
    min(λ12) > c (9)
    X in formula, y are the pixel coordinate of any on image;P be and a certain pixel (xi, yi) corresponding to 2 × 2 symmetrical matrixes;I is With (xi, yi) centered on 3 × 3 pixel window;IxAnd IyRespectively shade of gray of the pixel window I in x directions and y directions Value;W (x, y) is the weight coefficient corresponding to window I, and σ is the root mean square of all pixels gray value in pixel window I;λ1And λ2For Matrix P two characteristic roots, c are a constant;
    Scene adjustment constant c value, when only having unique pixel (x in mark object areac0, yc0) meet two features of matrix P When value is both greater than c, then (xc0, yc0) it is that steel truss emphasis monitors accurate coordinates of the position on image;Scheme using in formula (1) As the transformational relation between pixel coordinate and real world coordinates, obtain under the steel truss emphasis monitoring alive boundary's coordinate system in position Coordinate (Xc0, Yc0):
    (1/s) M=H-1m (10)
    H in formula-1For 3 × 3 mapping matrix H inverse matrix;
    (304) in steel truss hydraulic pressure lift overall process, the position that template matches track algorithm obtains each mark in real time is first passed through Put, then each emphasis monitoring position is obtained with Shi-Tomas Feature Points Matchings algorithm and coordinate transform in object area is indicated Real-time coordinates under world coordinate system, the coordinate of t are designated as (Xct, Yct);
    (305) changes in coordinates at t emphasis monitoring position is calculated:
    (ΔXct,ΔYct)=(Xct-Xc0,Yct-Yc0) (11)
    Δ X in formulactWith Δ YctCoordinate of the emphasis monitoring position in X-direction and Y direction respectively under t world coordinate system Changing value;
    (4) with (Δ Xct, Δ Yct) as t emphasis monitor position increment of coordinate modification template txt file in corresponding to Cell node coordinate, obtain the txt file of t;
    (5) txt file of t is imported in ANSYS and carries out finite element analysis, steel truss stress point is exported in analysis result The stress value of cloth cloud atlas and unit, and calculate stress axis:
    K=σeiiMax (12)
    K is unit i stress ratio in formula;σeiFor unit i true stress;σiMaxFor unit i allowable stresses;Work as k>When 0.9, Then provide pre-warning signal and targetedly adjust steel truss lifting scheme with reference to stress distribution situation.
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