阅读说明：本技术 一种塔桅结构初期损伤识别方法和系统 (Method and system for identifying initial damage of tower mast structure ) 是由 牛山 于 2021-07-16 设计创作，主要内容包括：本发明提供了一种塔桅结构初期损伤识别方法及系统,塔桅结构安装后,在自由端安装变形传感器,测得塔桅结构初始变形；测得塔桅结构自由端受载时的变形,当外载荷方向改变时；当载荷方向被主动或被动改变时,以椭圆或圆形曲线拟合各点,形成闭合曲线；建立三维笛卡尔直角坐标系oxyz,根据拟合曲线和曲面情况判断塔桅结构初期损伤类型、损伤方位、损伤具体位置和损伤程度。本发明最少仅采用单个变形传感器即可完成对塔桅结构健康状态的完整监测,数据获取便捷,数据量小,便于自动识别,且不但可在发生损伤的初期判定损伤类型,还可检测出各种塔桅结构的初期损伤方位和损伤位置,还可定量判断出损伤程度。(The invention provides a method and a system for identifying initial damage of a tower mast structure, wherein after the tower mast structure is installed, a deformation sensor is installed at a free end to measure the initial deformation of the tower mast structure; measuring the deformation of the free end of the tower mast structure when loaded, and when the direction of the external load is changed; when the load direction is actively or passively changed, fitting each point by an ellipse or a circular curve to form a closed curve; and establishing a three-dimensional Cartesian rectangular coordinate system oxyz, and judging the initial damage type, the damage direction, the specific damage position and the damage degree of the tower mast structure according to the fitting curve and the curved surface condition. The invention can complete the monitoring of the health state of the tower mast structure by adopting only a single deformation sensor at least, has convenient data acquisition, small data volume and convenient automatic identification, can judge the damage type at the initial stage of damage, can detect the initial damage position and damage position of various tower mast structures, and can quantitatively judge the damage degree.)

1. A method for identifying initial damage of a tower mast structure is characterized by comprising the following steps:

(1) after the tower mast structure is installed, a deformation sensor is installed at the free end, any two orthogonal directions dx and dy are selected in any parallel plane of a base horizontal plane of the tower mast structure, and a two-dimensional Cartesian rectangular coordinate system Odxdy is established;

(2) when the other loads or the external loads except the load which is not born by the tower mast structure are mutually offset and can be ignored, the initial deformation of the tower mast structure is measured, and the projection values Dx of the deformation in the directions Dx and dy are solved₀And Dy₀；

(3) Under the condition that the tower mast structure has no structural damage, selecting a certain external load with a certain size borne by the tower mast structure, wherein an equivalent force vector or an equivalent moment vector of the load is positioned in any parallel plane A of a basic horizontal plane of the tower mast structure, measuring the deformation of the free end of the tower mast structure when the free end is loaded through a deformation sensor arranged at the free end of the tower mast structure, and solving projection values of the deformation in the directions Dx and Dy which are respectively marked as Dx and Dy;

(4) selecting passive or active external loads with the same size, and measuring at least m (Dx, Dy) points in four quadrants of an Odxdy coordinate system respectively under the action of the external loads of an equivalent force vector or an equivalent tilting moment vector still positioned in a plane A when the direction of the external loads is changed;

(5) after the coordinate of each point excludes the influence of interference deformation, including the initial deformation measured in the step 2, generated by loads except the selected equivalent load, the points are fitted by a circular curve to form a closed curve, and the radius of the circular arc is recorded as R;

(6) under the condition that the initial damage state of the tower mast structure needs to be monitored, passive or active external loads with the same size are selected, and when the load direction is actively or passively changed, under the external load action of the tower mast structure with an equivalent force vector or a tipping moment vector still located in a plane A, at least n (Dx, Dy) points are measured in total in four quadrants of an Odxdy coordinate system respectively;

(7) after the coordinates of each point are subjected to the influence of interference deformation including the initial deformation measured in the step 2, which is generated by loads except the selected equivalent load, the points are fitted by an elliptic or circular curve to form a closed curve, the semi-major axis of the elliptic curve is recorded as Ra, and the radius of the circular arc is recorded as R;

(8) establishing a three-dimensional Cartesian rectangular coordinate system oxyz, taking the damage degree as an x-direction coordinate, taking Ra as a y-direction coordinate, taking the ratio of the damage height to the tower mast structure height as a z-direction coordinate, obtaining Ra values under the combination of at least two damage degrees and heights through calculation or measurement, making corresponding points in the coordinate system oxyz, fitting a curved surface H through the points, and enabling the H to comprise a straight line y = R and z = 1;

(9) and judging the initial damage type, the damage direction, the specific damage position and the damage degree of the tower mast structure according to the fitted curve and the curved surface condition.

2. The method of claim 1, wherein m in step 4 and n in step 6 are large enough to fit the curve segments in each quadrant as an ellipse or a circular arc.

3. The method of claim 1, wherein the preliminary damage identification of the tower mast structure is performed by subtracting the initial deformation Dx of the tower mast structure from the projection Dx and Dy of the coordinates Dx and Dy of each point in the directions of the Dy and the d, respectively₀And Dy₀And obtaining a new coordinate point after the interference deformation generated by the load except the selected equivalent load.

4. The method for identifying the initial damage of the tower mast structure according to claim 1, wherein in the step 9, the specific relationship between the fitting curve and the damage type and the orientation is as follows:

for the condition that the damage state of the tower mast structure needs to be monitored, if Ra = R, the tower mast structure is not damaged;

if the fitted curve is an elliptic curve Ra > R, the tower mast structure has structural material corrosion or peeling damage;

if the fitting curve is in ellipse (Ra > R) and arc combined connection, the tower mast structure has crack defect or connecting piece looseness defect;

if the fitted curve is an elliptic curve Ra > R, the damage position of the tower mast structure is positioned in the semimajor axis direction of the ellipse;

if the fitting curve is formed by combining and connecting an ellipse (Ra > R) and an arc, the damage position of the tower mast structure is positioned in the semimajor axis direction of the ellipse and positioned on one side of the arc.

5. The method for identifying the initial damage of the tower mast structure according to claim 1, wherein in the step 9, the specific relationship between the fitted curve and the curved surface and the specific position and degree of the damage is as follows:

drawing a plane y = Ra according to the obtained Ra value, and obtaining a cross-section curve L of the plane y = Ra and the curved surface H;

if the damage position z can be preliminarily determined, the damage degree can be determined by the x coordinate value of the point z on the curve L;

if the damage level x can be preliminarily determined, the damage position can be determined by the z-coordinate value of the point x on the curve L.

6. A monitoring system suitable for the early damage identification of the tower mast structure of claims 1 to 5 is characterized by mainly comprising a load sensing module, a deformation sensor, a data processing and storing module and a result display and early warning module;

the load sensing module is mainly configured to: the load sensing module comprises a wind power and wind direction sensor and a force or moment sensor and is used for monitoring the wind power, the wind direction and the working load of the tower mast structure;

the deformation sensing module is configured primarily to: selecting a deformation sensor to be fixed at the free end of the tower mast structure, measuring the deformation of the free end of the tower mast structure under the condition that the tower mast has no working load or external load is balanced after initial installation, measuring the deformation of the free end of the tower mast structure under the condition that the tower mast structure has no structural damage after initial installation or after being put into use, and monitoring the deformation of the free end of the tower mast structure in real time in the use or service process of the tower mast structure;

the data processing and storing module is mainly configured to: the D/A conversion sub-module completes the necessary analog-to-digital conversion of the signals acquired by the load sensing module and the displacement sensor module; controlling a host data cleaning program to clean and de-noise the data of the load sensing module and the deformation sensing module; the load calculation submodule calculates wind load and total equivalent load vector; the load classification submodule classifies the measured data of the deformation sensing module according to the magnitude of the equivalent load and the vector direction of the equivalent force or the vector direction of the tipping moment; the Ra calculation submodule completes the calculation of Ra values or R values under various working conditions; based on the novel method for identifying the initial damage of the tower mast structure, the damage identification submodule completes the identification of the initial damage of the tower mast structure; the control host completes necessary data encoding and stores the data in a hard disk form;

the result display and early warning module is mainly configured to: and displaying the initial damage identification result and the identification time-varying curve of the tower mast structure on a display or a display screen in real time through a display program, wherein the initial damage identification result comprises a damage type, a damage direction, a damage position and a damage degree, and once the damage is identified, the control host sends out damage early warning through an early warning program through an early warning terminal.

Technical Field

The invention relates to a method and a system for identifying initial damage of a tower mast structure, and belongs to the technical field of structural health monitoring.

Background

The tower mast structure is widely used in modern super high-rise buildings, wind driven generators, cranes and other mechanical equipment, such as high-rise chimney, wind driven generator tower, tower crane body and the like. Due to the complex action of wind load and working load, the corrosion action of the external environment, and the influence of various uncertain factors such as manufacturing defects, installation errors, artificial illegal operation and the like, the tower mast structure is easy to be damaged by fatigue fracture, corrosion defects, connector failure and the like. Because the tower mast structure is usually used as a main bearing structure in facilities or mechanical equipment, once damage develops to a certain degree, serious production accidents or collapse accidents are often caused, and great personnel and property loss is caused, so that the realization of accurate and reliable health monitoring on various tower mast structures is particularly important.

The method for monitoring vibration signals such as acceleration and the like or the shaking frequency of the tower drum, which is adopted in the past, for monitoring the structural damage of the tower drum of the wind driven generator has poor precision, and many theoretical and technical problems still need to be solved for realizing damage monitoring based on the vibration signals. In the relevant patents of health monitoring of a tower mast structure of a tower crane body, a method for measuring the displacement of the tower body by using a stiffness meter and the like is adopted, however, 201310141801.5, 201410261865.3, 201410261861.5 and 201410261694.4 are only limited to monitoring of bolt pretightening force of a standard section of the tower crane with a lattice structure, the identification precision of a quartic coincident circular track and two inner converging petal-shaped circular tracks is difficult to guarantee in practice, the realization process of data cleaning and the like is complex, and the method is not beneficial to engineering application and the accuracy and reliability of identification are not guaranteed. The wind driven generator tower drum damage monitoring based on the inclination angle or displacement sensor data mostly adopts a method of early warning when a certain characteristic quantity exceeds a set certain threshold value, so that only the whole state of the tower drum can be judged, the damage state of the tower drum can not be accurately identified basically in practical application, and the difficulty and the cost of hidden danger investigation are undoubtedly greatly increased for a tower mast structure with the height of a hundred meters. The wind driven generator tower drum structure monitoring based on the SCADA monitoring system is large in data volume, and a plurality of problems still exist in data screening and processing, and accurate identification of the damage state of the tower drum is difficult to achieve at present.

Disclosure of Invention

The invention aims to provide a method and a system for identifying the initial damage of a tower mast structure, which can not only judge the damage type in the initial stage of the damage, but also detect the damage position and the damage position of the tower mast structure and quantitatively judge the damage degree.

In order to achieve the purpose, the invention is realized by the following technical scheme:

(1) after the tower mast structure is installed, a deformation sensor is installed at the free end, any two orthogonal directions dx and dy are selected in any parallel plane of a base horizontal plane of the tower mast structure, and a two-dimensional Cartesian rectangular coordinate system Odxdy is established;

(2) when the other loads except the load of the tower mast structure which is not subjected to the gravity or the external loads which are subjected to the load are mutually offset and can be ignored, measuring the initial deformation of the tower mast structure, and solving the projection values Dx of the deformation in the directions Dx and dy₀And Dy₀；

(3) Under the condition that the tower mast structure has no structural damage, selecting a certain external load with a certain size borne by the tower mast structure, wherein an equivalent force vector or an equivalent moment vector of the load is positioned in any parallel plane A of a basic horizontal plane of the tower mast structure, measuring the deformation of the free end of the tower mast structure when the free end is loaded through a deformation sensor arranged at the free end of the tower mast structure, and solving projection values of the deformation in the directions Dx and Dy which are respectively marked as Dx and Dy;

(4) within a certain error range, selecting passive or active external loads with the same size, and respectively measuring at least m (Dx, Dy) points in four quadrants (including coordinate axes) of an Odxdy coordinate system under the action of the external loads of an equivalent force vector or an equivalent tilting moment vector still located in a plane A when the direction of the external loads is changed;

(5) after the coordinate of each point excludes the influence of interference deformation, including the initial deformation measured in the step 2, generated by loads except the selected equivalent load, the points are fitted by a circular curve to form a closed curve, and the radius of the circular arc is recorded as R;

(6) under the condition that the damage state of the tower mast structure needs to be monitored, passive or active external loads with the same size are selected, and when the load direction is actively or passively changed, under the external load action of the tower mast structure with an equivalent force vector or a tipping moment vector still located in a plane A, at least n (Dx, Dy) points are measured in total in four quadrants of an Odxdy coordinate system respectively;

(7) after the coordinates of each point are subjected to the influence of interference deformation including the initial deformation measured in the step 2, which is generated by loads except the selected equivalent load, the points are fitted by an elliptic or circular curve to form a closed curve, the semi-major axis of the elliptic curve is recorded as Ra, and the radius of the circular arc is recorded as R;

(8) establishing a three-dimensional Cartesian rectangular coordinate system oxyz, taking the damage degree as an x-direction coordinate, taking Ra as a y-direction coordinate, taking the ratio of the damage height to the tower mast structure height as a z-direction coordinate, obtaining Ra values under the combination of at least two damage degrees and heights through calculation or measurement, making corresponding points in the coordinate system oxyz, fitting a curved surface H through the points, and enabling the H to comprise a straight line y = R and z = 1;

(9) and judging the initial damage type, the damage direction, the specific damage position and the damage degree of the tower mast structure according to the fitted curve and the curved surface condition.

Preferably, m in step 4 and n in step 6 should be large enough to fit the curve segments in each quadrant as an ellipse or a circular arc.

Preferably, the specific method for eliminating the interference deformation in the steps 5 and 7 is to respectively subtract the initial deformation Dx of the tower mast structure from the projection values Dx and Dy of the coordinates Dx and Dy in the direction of each point₀And Dy₀And obtaining a new coordinate point after the interference deformation generated by the load except the selected equivalent load.

Preferably, in step 9, the specific relationship between the fitted curve and the type and orientation of the injury is as follows:

when the damage state of the tower mast structure needs to be monitored, if Ra = R within a certain error range, the tower mast structure is not damaged.

If the fitted curve is represented as an elliptic curve Ra > R within a certain error range, the tower mast structure has structural material corrosion or peeling damage.

If the fitting curve is in combination connection of an ellipse (Ra > R) and an arc within a certain error range, the tower mast structure has the defect of crack or loose connecting piece.

If the fitted curve is represented as an elliptic curve Ra > R within a certain error range, the damage position of the tower mast structure is positioned in the semimajor axis direction of the ellipse.

If the fitting curve is in combined connection with an ellipse (Ra > R) and an arc within a certain error range, the damage position of the tower mast structure is positioned in the semimajor axis direction of the ellipse and positioned on one side of the arc.

Preferably, in step 9, the specific relationship between the fitted curve and the curved surface and the specific position and degree of the injury is as follows:

and drawing a plane y = Ra according to the obtained Ra value, and obtaining a cross-section curve L of the plane y = Ra and the curved surface H.

If the damage location z can be preliminarily determined, the damage level can be determined by the x-coordinate value of the point z on the curve L.

If the damage level x can be preliminarily determined, the damage position can be determined by the z-coordinate value of the point x on the curve L.

A monitoring system for identifying initial damage of a tower mast structure mainly comprises a load sensing module, a deformation sensor, a data processing and storing module and a result displaying and early warning module;

the load sensing module is mainly configured to: the load sensing module comprises a wind power and wind direction sensor and a force or moment sensor and is used for monitoring the wind power, the wind direction and the working load of the tower mast structure;

the deformation sensing module is configured primarily to: selecting a deformation sensor to be fixed at the free end of the tower mast structure, measuring the deformation of the free end of the tower mast structure under the condition that the tower mast has no working load or external load is balanced after initial installation, measuring the deformation of the free end of the tower mast structure under the condition that the tower mast structure has no structural damage after initial installation or after being put into use, and monitoring the deformation of the free end of the tower mast structure in real time in the use or service process of the tower mast structure;

the data processing and storing module is mainly configured to: the D/A conversion sub-module completes the necessary analog-to-digital conversion of the signals acquired by the load sensing module and the displacement sensor module; controlling a host data cleaning program to clean and de-noise the data of the load sensing module and the deformation sensing module; the load calculation submodule calculates wind load and total equivalent load vector; the load classification submodule classifies the measured data of the deformation sensing module according to the magnitude of the equivalent load and the vector direction of the equivalent force or the vector direction of the tipping moment; the Ra calculation submodule completes the calculation of Ra values or R values under various working conditions; based on the novel method for identifying the initial damage of the tower mast structure, the damage identification submodule completes the identification of the initial damage of the tower mast structure; the control host completes necessary data encoding and stores the data in a hard disk form;

the result display and early warning module is mainly configured to: and displaying the initial damage identification result and the identification time-varying curve of the tower mast structure on a display or a display screen in real time through a display program, wherein the initial damage identification result comprises a damage type, a damage direction, a damage position and a damage degree, and once the damage is identified, the control host sends out damage early warning through an early warning program through an early warning terminal.

The invention has the advantages that: the invention discloses a novel method and a system for identifying initial damage of a tower mast structure, which are matched with the existing monitoring system of common tower mast structures and facilities, can complete the complete monitoring of the health state of the tower mast structure by at least adopting a single deformation sensor, are convenient to acquire data, have small data volume and convenient for automatic identification, can judge the damage type at the initial stage of damage, can detect the initial damage position and damage position of the tower mast structure, and can quantitatively judge the damage degree.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic diagram of a two-dimensional cartesian rectangular coordinate system Odxdy and a fitting curve in the method for identifying initial damage of a novel tower mast structure according to embodiment 1;

fig. 2 is a schematic diagram of a three-dimensional cartesian rectangular coordinate system oxyz and a curved surface H in the method for identifying initial damage of the novel tower mast structure according to embodiment 1;

fig. 3 is a schematic structural diagram of a monitoring system for identifying initial damage of a tower crane body by using the method provided by the invention in embodiment 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

EXAMPLE 1

As shown in fig. 1 and fig. 2, this embodiment 1 provides a method for identifying an initial damage of a novel tower mast structure, which includes the following steps:

in the horizontal plane of the tower foundation of the wind driven generator, the rightmost east direction is selected to be the dx direction, and the rightmost north direction is the dy direction.

And establishing a two-dimensional Cartesian rectangular coordinate system Odxdy.

After the wind driven generator is structurally installed, in a windless state, the initial displacement of the tower cylinder is measured through a displacement sensor installed at the free end of the tower cylinder, and the projection values of the displacement in the directions dx and dy are solved.

After the tower drum structure is initially installed and put into use, under the condition that the tower drum structure is not structurally damaged, wind load with a determined size borne by the tower drum is selected according to the wind power level, the wind load equivalent force vector is located in a plane A which is parallel to the base horizontal plane of the wind driven generator and passes through the centroid of the axial section of the tower drum, the displacement of the free end of the tower drum structure when the free end of the tower drum structure is loaded is measured through a displacement sensor installed at the free end of the tower drum structure, projection values of the displacement in the directions Dx and Dy are solved, and the projection values are respectively recorded as Dx and Dy.

According to the wind load with the determined size borne by the selected tower barrel, when the wind direction changes and the wind load direction borne by the tower barrel is passively changed, under the action of the wind load with the equivalent force vector still located in the plane A, at least 1 point (Dx, Dy) is respectively measured in four quadrants (including coordinate axes) of an Odxdy coordinate system, after the influence of the initial installation inclination of the tower barrel structure and the wind load borne by the wind power generator blade on the displacement of the free end of the tower barrel is eliminated from the coordinates of each point, each point is fitted with a circular curve to form a closed curve, and the radius of the circular arc is recorded as R.

Under the condition 1 that the damage state of the tower is required to be monitored, wind loads at the same wind power level are selected within a certain error range, and when the wind direction changes, at least 1 point (Dx, Dy) is measured in four quadrants (including coordinate axes) of an Odxdy coordinate system respectively under the action of the wind loads with equivalent force vectors or tipping moment vectors still located in a plane A. And (3) after the influence of the initial installation gradient of the tower cylinder structure and the wind load on the wind driven generator blade on the displacement of the free end of the tower cylinder is eliminated from the coordinates of each point, fitting each point by using an elliptic or circular curve to form a closed curve BNFM, and recording the semimajor axis of the elliptic curve as Ra and the radius of the circular arc as R.

Under the condition 2 that the damage state of the tower is required to be monitored, wind loads at the same wind power level are selected within a certain error range, and when the wind direction changes, at least 1 point (Dx, Dy) is measured in four quadrants (including coordinate axes) of an Odxdy coordinate system respectively under the action of external loads with equivalent force vectors or tilting moment vectors still located in a plane A. And (3) eliminating the influence of the initial installation gradient of the tower cylinder structure and the wind load on the wind driven generator blade on the displacement of the free end of the tower cylinder on the coordinates of each point, fitting each point by using an elliptic curve to form a closed curve BCDE, and recording the semimajor axis of the elliptic curve as Ra.

Establishing a three-dimensional Cartesian rectangular coordinate system oxyz, taking the damage degree as an x-direction coordinate, taking Ra as a y-direction coordinate, taking the ratio of the damage height to the tower mast structure height as a z-direction coordinate, measuring or calculating by using the steps through a displacement sensor to obtain Ra values under the combination of the two damage degrees and the heights, and making two corresponding points G, I in the coordinate system oxyz. Passing through these two points and the straight line y = R, z =1, the fitted surface H: y = (1-z) (sx + t-R) + R.

Within a certain error range, if Ra = R in case 1 or case 2, the tower is not damaged in case 1 or case 2.

Within a certain tolerance, if Ra > R in case 2, the tower mast structure has structural material corrosion or peeling damage.

Within a certain error range, if the fitting curve of the condition 1 is in combined connection of an ellipse (Ra > R) and an arc, the tower barrel structure has the defect of crack or the defect of looseness of a flange plate connecting piece.

Within a certain error range, if Ra > R in the case 2, the damage azimuth of the tower barrel is located in the semi-major axis direction of the ellipse.

Within a certain error range, if the fitting curve of the condition 1 is in combined connection of an ellipse (Ra > R) and an arc, the damage position of the tower drum structure is located in the semimajor axis direction of the ellipse and is located on one side of the arc.

And drawing a plane y = Ra according to the obtained Ra value, and obtaining a cross-section curve L of the plane y = Ra and the curved surface H.

If the damage location z can be preliminarily determined, the damage level can be determined by the x-coordinate value of the point z on the curve L.

If the damage level x can be preliminarily determined, the damage position can be determined by the z-coordinate value of the point x on the curve L.

Example 2

As shown in fig. 3, this embodiment 2 provides a monitoring system for identifying initial damage of a tower body of a tower crane with a typical tower mast structure by using the method provided by the present invention, and the monitoring system mainly includes a load sensing module 1, a deformation sensor, a data processing and storing module 2, and a result displaying and early warning module 3.

The load sensing module 1 is mainly configured to:

the load sensing module comprises a wind direction indicator with the precision of +/-3 degrees, a wind force sensor with the precision of +/-0.3 m/s, a torque sensor consisting of a weight sensor and an amplitude sensor, and is used for monitoring the wind force, the wind direction and the working load of the tower body structure of the crane.

The deformation sensing module is configured primarily to:

the method comprises the steps of selecting a displacement sensor, fixing the displacement sensor at the free end of a tower body structure of the tower crane, measuring the displacement of the free end of the tower body under the condition that the tower body is free of lifting load and is unloaded after initial installation, measuring the displacement of the free end of the tower body under the condition that the tower body is not structurally damaged after initial installation or after the initial installation or the initial installation is put into use, and monitoring the displacement of the free end of the tower body in real time in the use process of the tower crane.

The data processing and storage module is configured primarily to:

the D/A conversion sub-module completes the necessary analog-to-digital conversion for the signals collected by the load sensing module and the displacement sensor; the control host data cleaning program is used for cleaning and de-noising the data of the load sensing module and the displacement sensor; the load calculation submodule calculates the total equivalent load vector of the wind load and the working lifting moment; the load classification submodule classifies the measurement data of the displacement sensor according to the equivalent load and the equivalent tipping moment vector direction; the Ra calculation submodule completes the Ra value calculation under various working conditions according to the novel tower mast structure initial damage identification method provided by the invention; the damage distinguishing submodule completes the identification of the initial damage of the tower mast structure based on the novel identification method of the initial damage of the tower mast structure provided by the invention; the control host completes the necessary coding of data and stores the data in the form of a hard disk.

The result display and early warning module is mainly configured to:

through an interface display program, an initial damage identification result and an identification time-varying curve of a tower mast structure are displayed in real time on a control host display and an 8-inch display screen of a tower crane cab, the initial damage identification result and the identification time-varying curve comprise a damage type, a damage position and a damage degree, once damage is identified, the control host sends a damage sound early warning to a control host operator through an early warning program through a human alarm, sends a damage early warning to a tower crane driver through a buzzer, and displays damage items in red through the control host display and the 8-inch display screen of the tower crane cab.

The above examples 1 and 2 only represent possible embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. Variations and modifications within the spirit of the invention may occur to those skilled in the art without departing from the scope and spirit of the invention.