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1. 南京理工大学 机械工程学院, 江苏 南京 210094
2. 南京理工大学 瞬态物理全国重点实验室, 江苏 南京 210094
Received:29 November 2023,
Published Online:26 November 2024,
Published:30 November 2024
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Wei ZHAO, Baolin HOU. Multi-objective Optimization of Filament Winding Constrained Structure of Electromagnetic Gun[J]. Acta Armamentarii, 2024, 45(11): 3820-3832.
Wei ZHAO, Baolin HOU. Multi-objective Optimization of Filament Winding Constrained Structure of Electromagnetic Gun[J]. Acta Armamentarii, 2024, 45(11): 3820-3832. DOI: 10.12382/bgxb.2023.1144.
通过复合材料的经典层合板理论与坐标变换
简化材料模型
避免了复杂的复合材料铺层建模。为了解决电磁炮纤维缠绕约束结构的多目标优化问题
提出一种改进型免疫克隆布谷鸟多目标优化算法(Multi-objective Improved Immune Clonal Cuckoo Algorithm
MOIICCA)。通过对ZDT1~ZDT3测试函数的100组仿真计算
验证了MOIICCA的准确性
并利用反世代距离(Inverted Generational Distance
IGD)评价指标来度量MOIICCA的性能。通过引入深度神经网络(Deep Neural Network
DNN)
以646组电磁炮有限元计算结果为训练集
训练出满足工程使用要求的DNN代理模型来代替有限元仿真
提高了多目标优化的计算效率。最后利用MOIICCA对电磁炮纤维缠绕约束结构进行多目标优化
得到符合多目标优化要求的Pareto解集。IGD结果表明:MOIICCA相比于多目标粒子群优化算法和非支配排序遗传算法具有更高的计算精度和计算效率且在高维问题求解时更具优势
测试的时间结果也表明MOIICCA可以在更短的时间内求解得到质量更优的Pareto解集。前10组Pareto解的结果表明
电磁炮纤维缠绕约束结构的碳纤维层1主要以提高环向强度为主、碳纤维层2主要以平衡环向强度与轴向刚度为主。
Through the classical lamination theory and coordinate transformation
the material model is simplified
and the modeling of complex laminated composite is avoided. A multi-objective improved immune clonal cuckoo algorithm (MOIICCA) is proposed for the multi-objective optimization of fiber winding constrained structure of electromagnetic gun. The accuracy of MOIICCA algorithm is verified by 100 simulation calculations of ZDT1-ZDT3 test function
and the performance of MOIICCA algorithm is measured by inverted generational distance (IGD) evaluation index. By introducing the learning method of deep neural network and taking 646 groups of electromagnetic gun finite element calculation results as the training set
the deep neural network agent model which meets the engineering application requirements is trained to replace the finite element simulation
thus improving the computational efficiency of multi-objective optimization. Finally
MOIICCA algorithm is used to optimize the constrained structure of electromagnetic gun fiber winding
and the Pareto solution set is obtained. IGD results show that MOIICCA algorithm has higher computational accuracy and efficiency than the multiple objective particle swarm optimization algorithm and the non-dominated sorting genetic algorithm II
and has more advantages in solving the high-dimensional problems
and t. The test results also show that MOIICCA algorithm can get better Pareto set in a shorter time. The results of the first 10 sets of Pareto solutions show that the fiber layer 1 of the winding structure mainly improves the circumferential strength
and the fiber layer 2 mainly balances the circumferential strength and axial stiffness.
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田会方 , 仇振兴 , 吴迎峰 . 基于改进NSGA-Ⅱ的纤维缠绕落纱点轨迹采样特征权重优化 [J ] . 复合材料科学与工程 , 2024 ( 1 ): 54 - 59 . DOI: 10.19936/j.cnki.2096-8000.20240128.007 http://doi.org/10.19936/j.cnki.2096-8000.20240128.007 针对基于空间特征曲线特征函数的纤维缠绕落纱点轨迹采样算法无法自动选择特征权重的问题,建立以特征权重为变量,以得到采样点线性插值生成曲线与原曲线的MAE,RMSE为目标函数的双目标优化模型。提出基于改进NSGA-Ⅱ算法的双目标优化求解方法以优化特征权重。实例验证表明,与传统NSGA-Ⅱ算法相比,改进NSGA-Ⅱ算法求得Pareto解集的MAE,RMSE平均下降了0.002和0.105,算法选取特征权重的MAE,RMSE比特征权重为(0.1,0.3)的MAE,RMSE分别降低了约12.9%和8.5%,比特征权重为(0.9,0.1)的MAE,RMSE分别降低了约20.6%和11.4%,有效地提高了落纱点轨迹采样的精度。
TIAN H F , QIU Z X , WU Y F . Optimization of feature weights of filament winding dropping point trajectory sampling based on improved NSGA-II [J ] . Composites Science and Engineering , 2024 ( 1 ): 54 - 59 . (in Chinese)
李彬 , 谢新 , 唐文勇 , 等 . 基于近似模型的复合材料导管支臂结构性能分析 [J ] . 兵工学报 , 2022 , 43 ( 6 ): 1435 - 1446 . DOI: 10.12382/bgxb.2021.0300 http://doi.org/10.12382/bgxb.2021.0300 为分析气垫船复合材料导管支臂结构性能并进行高效率结构设计,采用一种带有权重系数变量的组合神经网络近似模型替代结构有限元计算。根据各铺层设计参数对结构性能影响的灵敏度进行分析并分组,建立多个神经网络模型,结合权重系数与各模型输出得到响应预测值。基于复合材料可设计性,应用优化拉丁超立方试验设计方法从细观和宏观层面分析研究导管支臂性能中材料参数的作用。结果表明:所提复合材料导管支臂结构组合近似模型方法具有较高精度,纤维弹性模量和基体剪切模量对导管支臂结构材料力学性能具有主导作用;在组分材料属性一定情况下,纤维体积分数的增加能够提高结构刚度与稳定性,在不同受力状态下纤维体积分数与各铺层角对结构失效影响有差异,设计时需进行特殊考虑;所提方法可为复合材料导管支臂结构性能分析及支臂结构材料一体化设计提供理论依据。
LI B , XIE X , TANG W Y , et al. Analysis of structural performance of composite duct supporting structure based on approximate model [J ] . Acta Armamentarii , 2022 , 43 ( 6 ): 1435 - 1446 . (in Chinese) DOI: 10.12382/bgxb.2021.0300 http://doi.org/10.12382/bgxb.2021.0300 The ensemble neural network approximation model method with variable weight coefficient is used to replace the structural finite element calculation in order to analyze the structural performance of the composite duct supporting structure of an air cushion vehicle for efficient structural design. Several neural network models are establishedaccording to the sensitivity of the ply design parameters to the structural performance,and the predicted response values are obtained from the weight coefficients and the output of each model. Based on the designability of composite materials,the influence of material parameters on the performance of the supporting structure is analyzed microcosmically and macroscosmically level by using the optimized Latin hypercube design method. The results show that: the approximate model for the composite material has a high accuracy;and the fiber elastic modulus and matrix shear modulus have significant impact on the mechanical properties of the composite material of the supporting structure. The increase in fiber volume fraction can improve the stiffness and stability of the structure when the properties of component materials are fixed. The influences of fiber volume fraction and ply angles on the structural failure are different under different stress states,so special consideration should be taken in the design.The proposed method provides a theoretical basis for the structural performance analysis and the integrated design of composite material duct supporting structure.
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SMITH J S , WU B , WILAMOWSKI B M . Neural network training with Levenberg-Marquardt and adaptable weight compression [J ] . IEEE Transactions on Neural Networks and Learning Systems , 2019 , 30 ( 2 ): 580 - 587 . DOI: 10.1109/TNNLS.2018.2846775 http://doi.org/10.1109/TNNLS.2018.2846775 Difficult experiments in training neural networks often fail to converge due to what is known as the flat-spot problem, where the gradient of hidden neurons in the network diminishes in value, rending the weight update process ineffective. Whereas a first-order algorithm can address this issue by learning parameters to normalize neuron activations, the second-order algorithms cannot afford additional parameters given that they include a large Jacobian matrix calculation. This paper proposes Levenberg-Marquardt with weight compression (LM-WC), which combats the flat-spot problem by compressing neuron weights to push neuron activation out of the saturated region and close to the linear region. The presented algorithm requires no additional learned parameters and contains an adaptable compression parameter, which is adjusted to avoid training failure and increase the probability of neural network convergence. Several experiments are presented and discussed to demonstrate the success of LM-WC against standard LM and LM with random restarts on benchmark data sets for varying network architectures. Our results suggest that the LM-WC algorithm can improve training success by 10 times or more compared with other methods.
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