[1]刘小光,朱伟庆,余琪,等.双椭球热源模型形状参数确定方法[J].长安大学学报(自然科学版),2025,45(6):124-134.
　LIU Xiao-guang,ZHU Wei-qing,YU Qi,et al.Determining method for shape parameters of dual-ellipsoidal heat source model[J].Journal of Chang’an University (Natural Science Edition),2025,45(6):124-134.
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双椭球热源模型形状参数确定方法()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年6期
页码:
124-134
栏目:
桥梁智能运维与防灾减灾
出版日期:
2025-11-30

文章信息/Info

Title:
Determining method for shape parameters of dual-ellipsoidal heat source model
文章编号:
1671-8879(2025)06-0124-11
作者:
刘小光1; 2; 朱伟庆1; 余琪1; 范永辉2; 周波1; 王浩2
(1. 长安大学 公路学院,陕西 西安 710064; 2. 陕西建工机械施工集团有限公司,陕西 西安 710032)
Author(s):
LIU Xiao-guang1; 2;  ZHU Wei-qing1;  YU Qi1;  FAN Yong-hui2;  ZHOU Bo1;  WANG Hao2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. SCEGC Mechanized Construction Group Co., Ltd., Xi'an 710032, Shaanxi, China)
关键词:
桥梁工程;  双椭球热源;  形状参数;  焊接温度场;  熔池尺寸
Keywords:
bridge engineering;  dual-ellipsoidal heat source;  shape parameter;  welding temperature field;  molten pool dimension
分类号:
U445
文献标志码:
A
摘要:
为准确确定钢结构焊接温度场,并精准预测焊接过程中的焊接应力与变形,提出了双椭球热源模型形状参数确定与预测方法; 进行了钢桁架节点的T型接头焊接试验,获得了熔池尺寸和测点温度场,并建立了仿真模型,探究了热源形状参数对不同距离测点温度的影响,确定了热源热效率的取值; 以测点峰值温度与熔池尺寸建立目标函数,根据热源对不同距离测点的影响定义了误差权重系数,确定了热源形状参数约束条件,并构建了热源参数多目标确定数学模型; 在约束条件内设计了模拟试验,根据目标函数计算出试验和模拟结果,以热源形状参数为自变量,目标函数计算结果为因变量,拟合了误差-热源尺寸函数,并根据最小因变量确定了最优热源形状参数,在此基础上拟合了热源形状参数预测回归曲线。研究结果表明:热源热效率不变时,测点距离热源越近,测点温度误差越大,热源尺寸对温度的影响越小; 热源对不同距离测点的影响越大,误差权重系数越大; 根据最优热源形状参数仿真得到的温度峰值和熔池尺寸与实测值的最大误差分别为2.38%与5.62%,热源形状参数预测值与模拟试验设计值的最大误差为6.92%。由此可见,提出的双椭球热源模型形状参数确定方法具有较高的精度,同时可大幅简化形状参数求解过程。
Abstract:
To accurately determine the welding temperature field of steel structures and precisely predict the welding stress and deformation during welding process, a determining and predicting method for shape parameters of dual-ellipsoidal heat source model was proposed. The T-joint welding test of steel truss joints was conducted to obtain the molten pool dimensions and measuring point temperature fields, and the simulation model was established. The influences of heat source shape parameters on temperature measuring points at different distances were investigated, and the value of heat source thermal efficiency was determined. Objective functions were established based on the peak temperature of measuring points and molten pool dimensions. Error weight coefficients were defined according to the influence of heat source on measuring points at different distances, the constraint conditions of heat source shape parameters were set, and a multi-objective determination mathematical model for heat source parameters was constructed. Simulation tests were designed within the constraint conditions. The test and simulation results were calculated according to the objective functions. The heat source shape parameters were taken as independent variables, and the objective function calculation results were taken as dependent variables to fit the error-heat source dimension function. The optimal heat source shape parameters were determined when the dependent variable was minimal. On this basis, prediction regression curves for heat source shape parameters were fitted. The research results show that when the heat source thermal efficiency remains constant, the closer a measurement point is to the heat source, the larger the temperature error of the measuring point, and the smaller the influence of heat source dimension on temperature. The greater the influence of heat source on measurement points at different distances, the greater the error weight coefficient. The maximum errors between the simulated peak temperature and molten pool dimensions according to the optimal heat source shape parameters and the measured values are 2.38% and 5.62%, respectively. The maximum error between the predicted heat source shape parameters and the simulated test design values is 6.92%. It can be seen that the proposed determining method for shape parameters of dual-ellipsoidal heat source model has a high accuracy and can greatly simplify the shape parameter solving process.6 tabs, 14 figs, 31 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-04-22
基金项目:国家重点研发计划项目(2021YFB2601000); 中央高校基本科研业务费专项资金项目(300102214916)
作者简介:刘小光(1975-),男,陕西临潼人,工学博士研究生,正高级工程师,E-mail:490619511@qq.com。
通信作者:朱伟庆(1987-),男,湖南娄底人,教授,工学博士,E-mail:zhuweiqing87@126.com。
更新日期/Last Update: 2025-12-20