CN-121704344-B - Digital twin-based safety regulation and control system for steam turbine base die carrier

CN121704344BCN 121704344 BCN121704344 BCN 121704344BCN-121704344-B

Abstract

The invention relates to the technical field of safety regulation and control of a steam turbine base die carrier, in particular to a digital twin-based steam turbine base die carrier safety regulation and control system, wherein a spatial position calibration unit is used for binding middle, edge and transition zone attribute labels for vertical rods, mapping coordinates to a digital twin three-dimensional model in real time, a layering stage association unit is used for dividing pouring layering according to preset thickness, creating independent threads to collect shaft force time sequence data of the vertical rods of the layer, dynamically calculating concrete volume as a load reference, a phase difference calibration unit is used for capturing peak value time points of the shaft force of the vertical rods, combining the horizontal distance of the vertical rods of the edge, pouring speed and concrete rheological property, dynamically calculating a maximum hysteresis threshold, judging abnormal phase difference, and a safety regulation and control unit is used for analyzing load conduction path difference to generate an asynchronous pouring instruction, pouring a central zone to be two thirds of layering thickness, restarting edge zone pouring after the shaft force of the middle vertical rod reaches a balance threshold, balancing load conduction rhythm, improving die carrier stability and guaranteeing construction safety.

Inventors

DENG JUNHUA
WANG HE
LIU YINGJIE
FAN FENG
GE JUNWEI

Assignees

中国电建集团江西省水电工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. Digital twin-based safety regulation and control system for a steam turbine base die carrier, which is characterized by comprising: The space position calibration unit (1) binds a space attribute label for each vertical rod in a preset digital twin gas turbine base die frame three-dimensional model according to collected beam bottom vertical rod arrangement parameters, comprises a middle vertical rod, an edge vertical rod and a transition zone vertical rod, and maps coordinate data of the vertical rods to corresponding supporting points of the three-dimensional model in real time; the layering stage association unit (2) divides the variable cross-section beam pouring process into a plurality of layering stages based on preset layering pouring thickness and real-time data of a pouring height sensor, when pouring of each layer is started, an independent data analysis thread is automatically established, the data analysis thread synchronously collects axial force time sequence data of all vertical rods in the height interval of the layer, and a time stamp zero point is reset; The phase difference calibration unit (3) takes the current layered pouring starting moment as a unified timing starting point, acquires the vertical shaft force through a strain sensor group, records the peak time point of the edge vertical shaft force value when the edge vertical shaft force value does not grow in a continuous period, synchronously captures the peak time point of the middle vertical shaft, invokes the upper limit value of the pouring speed and the lower limit value of the internal force monitoring frequency, dynamically calculates the maximum hysteresis time threshold value allowed by the current layer by combining the rheological characteristic parameters of the beam body concrete, calculates the absolute value of the peak time difference, compares the maximum hysteresis time threshold value with the absolute value of the peak time difference, and judges the abnormal phase difference according to the comparison result; When the safety regulation and control unit (4) detects an abnormal phase difference, the load conduction path difference between the edge upright posts and the middle upright posts is analyzed in real time, an asynchronous pouring control instruction is generated, the asynchronous pouring control instruction forces the concrete spreader to preferentially pour the center region of the beam to the preset proportion of the current layering thickness, the edge region pouring is paused, and after the concrete in the center region is changed completely and the axial force of the middle upright posts rises to the phase balance threshold, the edge region pouring is restarted.
2. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine according to claim 1, wherein the classification method of the spatial attribute tag is specifically as follows: Based on the acquired beam center line coordinates and pole pitch data in the beam bottom pole arrangement parameters, defining a row of poles closest to the horizontal projection of the beam center line as middle poles, defining two rows of poles closest to the inner wall of the beam side template and with the horizontal projection distance less than or equal to one fourth of the beam width as edge poles, and defining the rest poles between the middle poles and the edge poles as transition zone poles.
3. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine according to claim 1, wherein the division logic of the plurality of layering stages is specifically as follows: Setting a single-layer casting height threshold value based on a preset layered casting thickness, automatically triggering a layering stage increasing instruction when a casting height sensor detects that the rising height of a concrete casting surface reaches the single-layer casting height threshold value, dynamically calculating the concrete volume corresponding to the current layer according to real-time section size data of a variable section beam, and taking the concrete volume as a load calculation reference of a layer data analysis thread.
4. The digital twin based turbine pedestal formwork safety regulation system of claim 3, wherein said automatically creating independent data analysis threads comprises: When each layer of pouring is started, initializing a proprietary data container, loading beam section profile data by the proprietary data container according to the divided current layer geometric parameters, synchronously activating all upright rod sensor nodes in the strain sensor group, which are positioned in the height interval of the layer, and clearing a time axis by taking layered starting time as a reference, wherein the threads continuously run until the pouring thickness of the layer reaches the single layer pouring height threshold value, and automatically dormancy to realize cross-layer data isolation.
5. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine according to claim 4, wherein the capturing method of the peak time point is specifically as follows: In the created data analysis thread, a vertical rod axial force time sequence curve is acquired at a preset internal force monitoring frequency, when the change rate of an axial force value of an edge vertical rod in three continuous monitoring periods is lower than a preset rheological stability threshold value, the edge vertical rod is judged to reach a peak value, an edge vertical rod timestamp Te is recorded, the same judgment logic is synchronously executed for the middle vertical rod, the middle vertical rod timestamp Tm is recorded, and the rheological stability threshold value is dynamically set according to the called rheological characteristic parameters of the concrete.
6. The digital twin-based turbine pedestal die carrier safety regulation and control system of claim 5, wherein the dynamic calculation logic of the maximum lag time threshold is specifically: Firstly, a horizontal distance L from a defined edge upright rod to a beam center line is obtained, a real-time pouring speed V converted by a pumping speed fed back by a pouring equipment controller is combined, a basic conduction time L/V is calculated, and then the basic conduction time L/V is multiplied by a beam body concrete rheological characteristic coefficient K, wherein K is subjected to table lookup assignment according to initial setting time and slump index in a concrete mix proportion design book, and finally a maximum lag time threshold delta Tmax=K× (L/V) is generated, wherein the threshold is updated adaptively along with pouring positions and material performances.
7. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine according to claim 6, wherein the determination rule of the abnormal phase difference is specifically as follows: And (3) comparing the absolute value |Te-Tm| of the difference between the obtained edge pole setting timestamp Te and the middle pole setting timestamp Tm with a calculated maximum hysteresis time threshold value delta Tmax, judging as a load conduction abnormal phase difference when the absolute value |Te-Tm| is larger than the delta Tmax, triggering intervention of a safety regulation and control unit, and marking as a normal rheological hysteresis phase difference when the absolute value |Te-Tm| is smaller than or equal to the delta Tmax, and recording only data without triggering regulation.
8. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine according to claim 7, wherein the analysis method of the load conduction path difference is specifically as follows: When the load conduction abnormal phase difference is judged, the spatial position labels of the edge upright posts and the middle upright posts are called, a concrete load transmission path is reconstructed in a digital twin model, and differentiated asynchronous pouring control instruction parameters are generated by comparing the axial force rising slope differences of the two upright posts and the template supporting rigidity data.
9. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine is characterized in that the execution strategy of the asynchronous pouring control instruction is specifically as follows: the forced concrete spreader divides the defined casting area of the current layer into a central area and an edge area, the central area is cast preferentially to the height of two thirds of the thickness of the current layering, meanwhile, casting of the edge area is suspended completely, the central area covers the defined projection areas of all middle vertical poles and vertical poles of the adjacent transition areas, and the central area load is guaranteed to be fully conducted to the target vertical poles.
10. The digital twin-based safety regulation and control system for the base mold frame of the steam turbine is characterized in that the triggering conditions of the restarting pouring of the edge area are as follows: And after the pouring of the central area is finished, monitoring the defined central vertical shaft axial force change rate in real time, judging load conduction balance when the change rate is lower than the rheological stability threshold value for two continuous monitoring periods and the central vertical shaft axial force reaches the phase balance threshold value, restarting the pouring of the edge area till the finishing, and closing the asynchronous regulation and control instruction.

Description

Digital twin-based safety regulation and control system for steam turbine base die carrier Technical Field The invention relates to the technical field of safety regulation and control of a steam turbine base die carrier, in particular to a digital twin-based safety regulation and control system of a steam turbine base die carrier. Background The safety regulation and control of the die carrier of the steam turbine base is an important technology, and is particularly applied to a safe operation and maintenance link of the die carrier in the layered pouring process of the variable cross-section beam, the core is that the load conduction rhythm of the die carrier is balanced to avoid unbalance of the die carrier load, the core requirements on stability and safety of the die carrier are met by adapting the construction of the steam turbine base, the beam bottom upright of the die carrier of the steam turbine base is divided into a middle upright and an edge upright according to the space position, when the variable cross-section beam is layered pouring, concrete needs to flow from the pouring area to the periphery and transfer load, and the load transmission efficiency is influenced by the rheological property and the pouring speed of the concrete, so that the axial force peak value of the two types of upright is time-differentiated, and the die carrier is locally stressed intensively to cause deformation or instability risk. Disclosure of Invention The invention aims to provide a digital twin-based safety regulation and control system for a steam turbine base die carrier, so as to solve the problems in the background technology. In order to achieve the above object, a digital twin-based safety regulation and control system for a steam turbine base mold frame is provided, comprising: the space position calibration unit binds a space attribute label for each vertical rod in a preset digital twin three-dimensional model of the base die frame of the steam turbine according to the acquired beam bottom vertical rod arrangement parameters, comprises a middle vertical rod, an edge vertical rod and a transition region vertical rod, and maps coordinate data of the vertical rods to corresponding supporting points of the three-dimensional model in real time; The layering stage association unit divides the variable cross-section beam pouring process into a plurality of layering stages based on preset layering pouring thickness and real-time data of a pouring height sensor, when each layer of pouring is started, an independent data analysis thread is automatically established, the data analysis thread synchronously collects axial force time sequence data of all vertical rods in the height interval of the layer, and a time stamp zero point is reset; The phase difference calibration unit takes the current layered pouring starting moment as a unified timing starting point, acquires the vertical shaft force through a strain sensor group, records the peak time point of the edge vertical shaft force value when the edge vertical shaft force value does not grow in a continuous period, synchronously captures the peak time point of the middle vertical shaft, invokes the upper limit value of the pouring speed and the lower limit value of the internal force monitoring frequency, dynamically calculates the maximum hysteresis time threshold allowed by the current layer by combining the rheological characteristic parameters of the beam body concrete, calculates the absolute value of the peak time difference, compares the maximum hysteresis time threshold with the absolute value of the peak time difference, and judges the abnormal phase difference according to the comparison result; When the safety regulation and control unit detects an abnormal phase difference, the load conduction path difference between the edge upright posts and the middle upright posts is analyzed in real time, an asynchronous pouring control instruction is generated, the asynchronous pouring control instruction forces the concrete spreader to pour the center region of the beam to the preset proportion of the current layering thickness preferentially, the edge region pouring is paused, and after the concrete in the center region is rheological and the axial force of the middle upright posts rises to the phase balance threshold value, the edge region pouring is restarted. Compared with the prior art, the invention has the beneficial effects that: According to the invention, through the spatial position calibration unit, the vertical rods in the middle, the edges and the transition areas are precisely classified, the load conduction roles of different vertical rods are clarified, an object foundation is laid for subsequent monitoring and regulation, the layering stage association unit divides the pouring stage according to the preset thickness, an independent data analysis thread is created to isolate the cross-layer data, load concentration caused by overhigh single p