CN-121457223-B - Sea work structure SPMT layout method based on model structure analysis method

CN121457223BCN 121457223 BCN121457223 BCN 121457223BCN-121457223-B

Abstract

The invention discloses a marine structure SPMT layout method based on a model structure analysis method, which belongs to the technical field of SPMT layout and is used for SPMT layout, and comprises the steps of determining the range of an SPMT layout area as a general constraint condition based on the physical information of a armor plate, modeling the physical model of the armor plate on the physical information of the armor plate, and judging the distribution condition of a main beam in the armor plate; and performing finite element analysis to obtain a structural strength value, and taking the hydraulic balance and the structural strength value as two variables of a fitness function to obtain the SPMT layout state of a unique solution. According to the invention, a solution set of an optimal compromise scheme of the whole structure safety and hydraulic balance is obtained through automatic calculation, and an optimal sea work structure SPMT layout scheme is obtained.

Inventors

Zhang Qianran
ZHAI XIAORUI
WANG SHENGLI
Guo Yingxiu
WANG XIUKUN
KAN ZHUO

Assignees

山东科技大学

Dates

Publication Date: 20260505
Application Date: 20260105

Claims (9)

1. The marine structure SPMT layout method based on the model structure analysis method is characterized by comprising the following steps: S1, determining an SPMT layout area range as a general constraint condition based on physical information of a armor plate piece; s2, modeling a physical model of the armor plate on the physical information of the armor plate, and judging the distribution condition of the main beam in the armor plate; S3, taking the SPMT layout state as a chromosome structure initialization population, wherein the SPMT state parameters comprise the head coordinates of the SPMT, the direction angle of the SPMT, the number of axes of each SPMT and the hydraulic distribution of each SPMT; S4, calculating hydraulic balance; S5, connecting a physical model of the armor plate with a physical model of each SPMT based on the distribution condition of the main beams in the armor plate; S6, finite element analysis is carried out to obtain a structural strength value; S7, taking the hydraulic balance and the structural strength value as two variables of the fitness function to obtain the SPMT layout state of the unique solution; s8, outputting an SPMT layout scheme of the marine structure by using a graphical interface based on the SPMT layout state; Calculating hydraulic balance comprises dividing the axes of the SPMT into 4 parts, hydraulically connecting the axes of each part, and buckling when the connecting line between the centroid coordinates of each part enters the set range of the integral center of gravity of the deck plate; Hydraulic equalization The method comprises the following steps: ; In the formula, Is the average hydraulic pressure of all the SPMT axes involved in the calculation, Is a penalty factor of the number of the penalty points, Is a preset minimum safety radius that is set to be the minimum safety radius, Is the integral center of gravity to the first The group hydraulic divides the linear distance of the centroid, Is the first The hydraulic grouping of the individual SPMT's, Is the first Average pressure of group SPMT hydraulic packet.
2. The marine structure SPMT layout method based on the model structure analysis method according to claim 1, wherein S1 comprises selecting a main beam range of the deck plate as an outer edge of a layout area range based on physical information of the deck plate, excluding a range in which the deck plate overhangs beyond a first set threshold, and a range in which spans on both sides of the deck plate do not exceed a second set threshold, taking the range satisfying the above condition as a general constraint condition.
3. The marine structure SPMT layout method based on the model structure analysis method according to claim 2, wherein the modeling of the physical model of the armor plate based on the physical information of the armor plate comprises dividing the armor plate into five categories of nodes, beams, types, loads and loads based on the physical information of the armor plate, and constructing a geometric model and a mechanical model for the armor plate by category; judging the distribution condition of the main beams in the armor plate comprises identifying all beams which are I-steel and have the heights exceeding a third set threshold value, forming the whole main beam, and connecting the main beam sections with the same X or the same Y coordinate into a main beam.
4. A marine structure SPMT layout method based on a model structure analysis method as claimed in claim 3, wherein initializing the population comprises: ; ; In the formula, Is the population after the initialization of the device, Is the first The headstock coordinates of the SPMTs are under the general constraint condition, Is the first The direction angle of the individual SPMT's, Is the first The number of axes of the individual SPMTs, And Obtained by discrete uniform sampling.
5. The marine structure SPMT layout method based on the model structure analysis method according to claim 4, wherein connecting the physical model of the armor plate with the physical model of each SPMT comprises calculating start and end coordinates of the SPMT, intersections where the SPMT and all the girders may exist, based on the state parameters of the SPMT and each piece of girder information obtained in S2; Calculating the distance from the SPMT to a specific type of main beam based on the type of the main beam, and adding a connection between a physical model of the armor plate and the physical model of the SPMT, wherein the connection is positioned at an intersection point where the SPMT and all main beams possibly exist, and the connection length is the distance from the SPMT to the specific type of main beam; the load bearing and load bearing groups are added on the physical model of the SPMT according to the weight borne by the hydraulic group.
6. The marine structure SPMT layout method based on the model structure analysis method as recited in claim 5, wherein calculating start coordinates and end coordinates of the SPMT comprises: ; ; In the formula, And Is the first The end coordinates of the individual SPMT are, And Is the first Start coordinates of the SPMT.
7. The method for laying out the marine structure SPMT including the model structure analysis method according to claim 6, wherein obtaining the structural strength value includes fixing the physical model of the SPMT after connection, fixing the starting coordinates and the ending coordinates of the two sets of SPMT by 4 nodes, calculating the physical model of the SPMT after fixing by using the finite element analysis method, and obtaining the UC values of all the nodes and the beams, wherein the largest value among the UC values is the structural strength value.
8. The marine structure SPMT layout method based on the model structural analysis method of claim 7, wherein obtaining the SPMT layout state of the unique solution comprises ordering according to a non-dominant relationship two variables of hydraulic equality and structural strength values as a fitness function: ; ; In the formula, As a matter of general constraint conditions, Is the value of hydraulic balance; Based on the sequencing result, combining an elite reservation mechanism, reserving partial optimal solutions, and intersecting and mutating the reserved solutions to generate new offspring; And repeating the above process until the result is not improved after more than 1000 generations or 50 generations are continuously cycled, outputting the current leading-edge solution, adding parameters to two variables of the solution in the leading-edge solution, obtaining the finally determined unique solution, and outputting the SPMT layout state contained in the determined unique solution.
9. The marine structure SPMT layout method based on the model structure analysis method according to claim 8, wherein the SPMT layout state is determined, the deck plate top view and the side view are taken as bottom diagrams of the SPMT layout diagram based on the physical model of the deck plate, the SPMT layout state is drawn on the bottom diagrams based on the SPMT layout state and the connection state of the SPMT and the deck plate, and the marks, the charts and the remarks are added.

Description

Sea work structure SPMT layout method based on model structure analysis method Technical Field The invention discloses a marine structure SPMT layout method based on a model structure analysis method, and belongs to the technical field of SPMT layout. Background In the field of ocean engineering, the land transportation of large marine structures (such as deck plates, modules, etc.) is a complex and critical link. Self-propelled modular transport vehicles (SPMT) are the primary devices for accomplishing such transport tasks due to their strong load carrying capacity and flexible combination characteristics. The design of the SPMT layout scheme, i.e. how to plan and arrange a plurality of SPMT vehicles to jointly carry a huge structure, is directly related to the safety and feasibility of the transportation process. To solve such complex engineering optimization problems, multi-objective optimization algorithms have been introduced in academia and industry. The arrangement of SPMT is a typical multi-objective optimization problem, the objectives of which are often conflicting, such as pursuing the highest structural safety (i.e. lowest structural stress value) and the best hydraulic balance (i.e. lowest hydraulic pressure difference) often not being optimal at the same time. In this context, the fast non-dominant ordered genetic algorithm with elite retention strategy (NSGA-II) is an advanced technology to solve such problems. NSGA-II is a powerful multi-objective optimization algorithm that is capable of handling multiple conflicting objective functions simultaneously. The algorithm can efficiently search and obtain a set consisting of a plurality of optimal tradeoff solutions, namely a Pareto Front (Pareto Front) through mechanisms such as non-dominant ranking, congestion degree calculation and the like. Each solution in this solution set represents an optimal compromise between different objectives, providing a decision maker with a diversified, high quality choice space instead of a single, absolute optimal solution. However, how to effectively combine such advanced optimization algorithms as NSGA-II with the physical model of the marine structure and the finite element analysis method to achieve the automatic and intelligent generation of the SPMT layout scheme is still a technical challenge in the field. Therefore, in the prior art, there is an urgent need for an SPMT layout method that can comprehensively consider structural strength and hydraulic balance, and automatically find an optimal or near-optimal solution set, so as to replace complex and limited-precision manual planning, thereby improving the safety and efficiency of large-scale structure transportation. Disclosure of Invention The invention aims to provide a marine structure SPMT layout method based on a model structure analysis method, which aims to solve the problem that in the prior art, the highest structural safety (namely the lowest structural stress value) and the best hydraulic balance (namely the lowest hydraulic pressure difference) are not always achieved at the same time. The marine structure SPMT layout method based on the model structure analysis method comprises the following steps: S1, determining an SPMT layout area range as a general constraint condition based on physical information of a armor plate piece; s2, modeling a physical model of the armor plate on the physical information of the armor plate, and judging the distribution condition of the main beam in the armor plate; S3, taking the SPMT layout state as a chromosome structure initialization population, wherein the SPMT state parameters comprise the head coordinates of the SPMT, the direction angle of the SPMT, the number of axes of each SPMT and the hydraulic distribution of each SPMT; S4, calculating hydraulic balance; S5, connecting a physical model of the armor plate with a physical model of each SPMT based on the distribution condition of the main beams in the armor plate; S6, finite element analysis is carried out to obtain a structural strength value; S7, taking the hydraulic balance and the structural strength value as two variables of the fitness function to obtain the SPMT layout state of the unique solution; s8, outputting an SPMT layout scheme of the marine structure by using a graphical interface based on the SPMT layout state. S1, based on physical information of the armor plate, selecting a main beam range of the armor plate as an outer edge of a range of a layout area, excluding a range of the armor plate overhanging beyond a first set threshold, and enabling spans on two sides of the armor plate not to exceed a second set threshold, wherein the range meeting the conditions is used as a general constraint condition. The physical model modeling of the armor plate comprises dividing the armor plate into five categories of nodes, beams, types, loads and combinations of loads based on the physical information of the armor plate, and constructing a geom