As a critical component of the turbine rotor,the baffle plays an essential role in ensuring safe and reliable operation of the aero-engine.This study addresses the issue of excessive local stress in the baffle of a hi...As a critical component of the turbine rotor,the baffle plays an essential role in ensuring safe and reliable operation of the aero-engine.This study addresses the issue of excessive local stress in the baffle of a high-pressure turbine disc.The structural design optimization is performed using the self-developed Zhizhou software integrated with the slime mould algorithm(SMA).Leveraging advanced algorithms and comprehensive simulation interfaces,the Zhizhou software effectively exploits the potential of structural design,leading to significant improvements in structural performance.The SMA algorithm employs a positive feedback mechanism and adaptive strategies through the incorporation of fitness weights and oscillation factors.These parameters simulate the oscillatory contraction behavior of slime moulds,allowing the algorithm to dynamically adjust search direction and speed,thereby achieving an effective balance between local exploration and global optimization.During the optimization process,a sector submodel is established,and the contact model is simplified using a force load equivalence approach to improve computational efficiency.Subsequently,a parametric model of the baffle is developed based on geometric characteristics,stress responses,and boundary constraints,with the variation ranges of key parameters being determined.A mathematical model is then formulated with the objective of minimizing the maximum equivalent stress,under the constraint of the axial support reaction force at the contact surface.Finally,an integrated design optimization workflow is constructed using Zhizhou in combination with Unigraphics(UG)and Workbenchs,as well as incorporating the SMA algorithm to optimize the baffle structure.After optimization,the maximum equivalent stress is decreased from 1382.4 to 1235.4 MPa,a reduction of 10.6%.Meanwhile,the axial support reaction force is increased from 4158.9 to 4330.6 N,a variation of 4.0%,which satisfies the requirement for being within 12%.These results validate the effectiveness of the SMA algorithm in the structural design optimization of the baffle and demonstrate the practical value of the Zhizhou software in engineering applications.展开更多
This work proposes an improved multi-objective slime mould algorithm, called IBMSMA, for solving the multi-objective truss optimization problem. In IBMSMA, the chaotic grouping mechanism and dynamic regrouping strateg...This work proposes an improved multi-objective slime mould algorithm, called IBMSMA, for solving the multi-objective truss optimization problem. In IBMSMA, the chaotic grouping mechanism and dynamic regrouping strategy are employed to improve population diversity;the shift density estimation is used to assess the superiority of search agents and to provide selection pressure for population evolution;and the Pareto external archive is utilized to maintain the convergence and distribution of the non-dominated solution set. To evaluate the performance of IBMSMA, it is applied to eight multi-objective truss optimization problems. The results obtained by IBMSMA are compared with other 14 well-known optimization algorithms on hypervolume, inverted generational distance and spacing-to-extent indicators. The Wilcoxon statistical test and Friedman ranking are used for statistical analysis. The results of this study reveal that IBMSMA can find the Pareto front with better convergence and diversity in less time than state-of-the-art algorithms, demonstrating its capability in tackling large-scale engineering design problems.展开更多
The Swarm intelligence algorithm is a very prevalent field in which some scholars have made outstanding achievements.As a representative,Slime mould algorithm(SMA)is widely used because of its superior initial perform...The Swarm intelligence algorithm is a very prevalent field in which some scholars have made outstanding achievements.As a representative,Slime mould algorithm(SMA)is widely used because of its superior initial performance.Therefore,this paper focuses on the improvement of the SMA and the mitigation of its stagnation problems.For this aim,the structure of SMA is adjusted to develop the efficiency of the original method.As a stochastic optimizer,SMA mainly stimulates the behavior of slime mold in nature.For the harmony of the exploration and exploitation of SMA,the paper proposed an enhanced algorithm of SMA called ECSMA,in which two mechanisms are embedded into the structure:elite strategy,and chaotic stochastic strategy.The details of the original SMA and the two introduced strategies are given in this paper.Then,the advantages of the improved SMA through mechanism comparison,balance-diversity analysis,and contrasts with other counterparts are validated.The experimental results demonstrate that both mechanisms have a significant enhancing effect on SMA.Also,SMA is applied to four structural design issues of the welded beam design problem,PV design problem,I-beam design problem,and cantilever beam design problem with excellent results.展开更多
Field-road trajectory segmentation(FRTS)is a critical step in the processing of agricultural machinery trajectory data.This study presents a generalized optimization framework based on metaheuristic algorithms(MAs)to ...Field-road trajectory segmentation(FRTS)is a critical step in the processing of agricultural machinery trajectory data.This study presents a generalized optimization framework based on metaheuristic algorithms(MAs)to increase the accuracy of the field-road trajectory segmentation model.The MA optimization process is used in this framework to precisely and quickly identify the parameters of the FRTS model.It is difficult to solve the parameter optimization problem with basic metaheuristic algorithms without falling into local optima due to their insufficient performance.This study therefore combines a genetic algorithm(GA)with a slime mould algorithm(SMA)to propose a novel enhanced hybrid algorithm(GASMA);the algorithm has superior global search capability due to the implicit parallelism of the GA,and the oscillation concentration mechanism of the SMA is used to enhance the algorithm’s local search capability.To maintain the balance between the two capacities,a nonlinear parameter management technique is developed that adaptively modifies the algorithm’s computational process based on the fitness distribution deviation of the population.Experiments were conducted on real agricultural trajectory datasets with various sample frequencies,and the proposed algorithm was compared with existing methods to validate its efficiency.According to the experimental data,the optimized model produced better results.The proposed approach provides an automatic and accurate method for determining the optimal parameter configurations of FRTS model instances,where the parameter optimization solution is not confined to a single specified procedure and can be addressed by a variety of metaheuristic algorithms.展开更多
Reducing pollutant emissions from electricity production in the power system positively impacts the control of greenhouse gas emissions.Boosting kernel search optimizer(BKSO)is introduced in this research to solve the...Reducing pollutant emissions from electricity production in the power system positively impacts the control of greenhouse gas emissions.Boosting kernel search optimizer(BKSO)is introduced in this research to solve the combined economic emission dispatch(CEED)problem.Inspired by the foraging behavior in the slime mould algorithm(SMA),the kernel matrix of the kernel search optimizer(KSO)is intensified.The proposed BKSO is superior to the standard KSO in terms of exploitation ability,robustness,and convergence rate.The CEC2013 test function is used to assess the improved KSO's performance and compared to 11 well-known optimization algorithms.BKSO performs better in statistical results and convergence curves.At the same time,BKSO achieves better fuel costs and fewer pollution emissions by testing with four real CEED cases,and the Pareto solution obtained is also better than other MAs.Based on the experimental results,BKSO has better performance than other comparable MAs and can provide more economical,robust,and cleaner solutions to CEED problems.展开更多
Intelligent Transportation System(ITS)is one of the revolutionary technologies in smart cities that helps in reducing traffic congestion and enhancing traffic quality.With the help of big data and communication techno...Intelligent Transportation System(ITS)is one of the revolutionary technologies in smart cities that helps in reducing traffic congestion and enhancing traffic quality.With the help of big data and communication technologies,ITS offers real-time investigation and highly-effective traffic management.Traffic Flow Prediction(TFP)is a vital element in smart city management and is used to forecast the upcoming traffic conditions on transportation network based on past data.Neural Network(NN)and Machine Learning(ML)models are widely utilized in resolving real-time issues since these methods are capable of dealing with adaptive data over a period of time.Deep Learning(DL)is a kind of ML technique which yields effective performance on data classification and prediction tasks.With this motivation,the current study introduces a novel Slime Mould Optimization(SMO)model with Bidirectional Gated Recurrent Unit(BiGRU)model for Traffic Prediction(SMOBGRU-TP)in smart cities.Initially,data preprocessing is performed to normalize the input data in the range of[0,1]using minmax normalization approach.Besides,BiGRUmodel is employed for effective forecasting of traffic in smart cities.Moreover,the novelty of the work lies in using SMO algorithm to effectively adjust the hyperparameters of BiGRU method.The proposed SMOBGRU-TP model was experimentally validated and the simulation results established the model’s superior performance in terms of prediction compared to existing techniques.展开更多
基金supported in part by the National Natural Science Foundation of China(No.52475285)the Natural Science Foundation of Fujian Province,China(No.2025J09012)Fundamental Research Funds for the Central Universities(No.20720240062).
摘要As a critical component of the turbine rotor,the baffle plays an essential role in ensuring safe and reliable operation of the aero-engine.This study addresses the issue of excessive local stress in the baffle of a high-pressure turbine disc.The structural design optimization is performed using the self-developed Zhizhou software integrated with the slime mould algorithm(SMA).Leveraging advanced algorithms and comprehensive simulation interfaces,the Zhizhou software effectively exploits the potential of structural design,leading to significant improvements in structural performance.The SMA algorithm employs a positive feedback mechanism and adaptive strategies through the incorporation of fitness weights and oscillation factors.These parameters simulate the oscillatory contraction behavior of slime moulds,allowing the algorithm to dynamically adjust search direction and speed,thereby achieving an effective balance between local exploration and global optimization.During the optimization process,a sector submodel is established,and the contact model is simplified using a force load equivalence approach to improve computational efficiency.Subsequently,a parametric model of the baffle is developed based on geometric characteristics,stress responses,and boundary constraints,with the variation ranges of key parameters being determined.A mathematical model is then formulated with the objective of minimizing the maximum equivalent stress,under the constraint of the axial support reaction force at the contact surface.Finally,an integrated design optimization workflow is constructed using Zhizhou in combination with Unigraphics(UG)and Workbenchs,as well as incorporating the SMA algorithm to optimize the baffle structure.After optimization,the maximum equivalent stress is decreased from 1382.4 to 1235.4 MPa,a reduction of 10.6%.Meanwhile,the axial support reaction force is increased from 4158.9 to 4330.6 N,a variation of 4.0%,which satisfies the requirement for being within 12%.These results validate the effectiveness of the SMA algorithm in the structural design optimization of the baffle and demonstrate the practical value of the Zhizhou software in engineering applications.
基金supported by the National Science Foundation of China under Grant No.U21A20464,62066005Innovation Project of Guangxi University for Nationalities Graduate Education under Grant gxun-chxs2021058.
摘要This work proposes an improved multi-objective slime mould algorithm, called IBMSMA, for solving the multi-objective truss optimization problem. In IBMSMA, the chaotic grouping mechanism and dynamic regrouping strategy are employed to improve population diversity;the shift density estimation is used to assess the superiority of search agents and to provide selection pressure for population evolution;and the Pareto external archive is utilized to maintain the convergence and distribution of the non-dominated solution set. To evaluate the performance of IBMSMA, it is applied to eight multi-objective truss optimization problems. The results obtained by IBMSMA are compared with other 14 well-known optimization algorithms on hypervolume, inverted generational distance and spacing-to-extent indicators. The Wilcoxon statistical test and Friedman ranking are used for statistical analysis. The results of this study reveal that IBMSMA can find the Pareto front with better convergence and diversity in less time than state-of-the-art algorithms, demonstrating its capability in tackling large-scale engineering design problems.
基金supported in part by the National Natural Science Foundation of China(J2124006,62076185)。
摘要The Swarm intelligence algorithm is a very prevalent field in which some scholars have made outstanding achievements.As a representative,Slime mould algorithm(SMA)is widely used because of its superior initial performance.Therefore,this paper focuses on the improvement of the SMA and the mitigation of its stagnation problems.For this aim,the structure of SMA is adjusted to develop the efficiency of the original method.As a stochastic optimizer,SMA mainly stimulates the behavior of slime mold in nature.For the harmony of the exploration and exploitation of SMA,the paper proposed an enhanced algorithm of SMA called ECSMA,in which two mechanisms are embedded into the structure:elite strategy,and chaotic stochastic strategy.The details of the original SMA and the two introduced strategies are given in this paper.Then,the advantages of the improved SMA through mechanism comparison,balance-diversity analysis,and contrasts with other counterparts are validated.The experimental results demonstrate that both mechanisms have a significant enhancing effect on SMA.Also,SMA is applied to four structural design issues of the welded beam design problem,PV design problem,I-beam design problem,and cantilever beam design problem with excellent results.
基金supported by the National Natural Science Foundation of China(32301691)the National Key R&D Program of China and Shandong Province,China(2021YFB3901300)National Precision Agriculture Application Project(JZNYYY001).
摘要Field-road trajectory segmentation(FRTS)is a critical step in the processing of agricultural machinery trajectory data.This study presents a generalized optimization framework based on metaheuristic algorithms(MAs)to increase the accuracy of the field-road trajectory segmentation model.The MA optimization process is used in this framework to precisely and quickly identify the parameters of the FRTS model.It is difficult to solve the parameter optimization problem with basic metaheuristic algorithms without falling into local optima due to their insufficient performance.This study therefore combines a genetic algorithm(GA)with a slime mould algorithm(SMA)to propose a novel enhanced hybrid algorithm(GASMA);the algorithm has superior global search capability due to the implicit parallelism of the GA,and the oscillation concentration mechanism of the SMA is used to enhance the algorithm’s local search capability.To maintain the balance between the two capacities,a nonlinear parameter management technique is developed that adaptively modifies the algorithm’s computational process based on the fitness distribution deviation of the population.Experiments were conducted on real agricultural trajectory datasets with various sample frequencies,and the proposed algorithm was compared with existing methods to validate its efficiency.According to the experimental data,the optimized model produced better results.The proposed approach provides an automatic and accurate method for determining the optimal parameter configurations of FRTS model instances,where the parameter optimization solution is not confined to a single specified procedure and can be addressed by a variety of metaheuristic algorithms.
基金This research was supported by the Science&Technology Development Project of Jilin Province,China(YDZJ202201ZYTS555)the Science&Technology Research Project of the Education Department of Jilin Province,China(JJKH20220244KJ)。
摘要Reducing pollutant emissions from electricity production in the power system positively impacts the control of greenhouse gas emissions.Boosting kernel search optimizer(BKSO)is introduced in this research to solve the combined economic emission dispatch(CEED)problem.Inspired by the foraging behavior in the slime mould algorithm(SMA),the kernel matrix of the kernel search optimizer(KSO)is intensified.The proposed BKSO is superior to the standard KSO in terms of exploitation ability,robustness,and convergence rate.The CEC2013 test function is used to assess the improved KSO's performance and compared to 11 well-known optimization algorithms.BKSO performs better in statistical results and convergence curves.At the same time,BKSO achieves better fuel costs and fewer pollution emissions by testing with four real CEED cases,and the Pareto solution obtained is also better than other MAs.Based on the experimental results,BKSO has better performance than other comparable MAs and can provide more economical,robust,and cleaner solutions to CEED problems.
基金The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through Large Groups Project under grant number(180/43)Princess Nourah bint Abdulrahman University Researchers Supporting Project number(PNURSP2022R303)Princess Nourah bint Abdulrahman University,Riyadh,Saudi Arabia.The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code:22UQU4340237DSR21.
摘要Intelligent Transportation System(ITS)is one of the revolutionary technologies in smart cities that helps in reducing traffic congestion and enhancing traffic quality.With the help of big data and communication technologies,ITS offers real-time investigation and highly-effective traffic management.Traffic Flow Prediction(TFP)is a vital element in smart city management and is used to forecast the upcoming traffic conditions on transportation network based on past data.Neural Network(NN)and Machine Learning(ML)models are widely utilized in resolving real-time issues since these methods are capable of dealing with adaptive data over a period of time.Deep Learning(DL)is a kind of ML technique which yields effective performance on data classification and prediction tasks.With this motivation,the current study introduces a novel Slime Mould Optimization(SMO)model with Bidirectional Gated Recurrent Unit(BiGRU)model for Traffic Prediction(SMOBGRU-TP)in smart cities.Initially,data preprocessing is performed to normalize the input data in the range of[0,1]using minmax normalization approach.Besides,BiGRUmodel is employed for effective forecasting of traffic in smart cities.Moreover,the novelty of the work lies in using SMO algorithm to effectively adjust the hyperparameters of BiGRU method.The proposed SMOBGRU-TP model was experimentally validated and the simulation results established the model’s superior performance in terms of prediction compared to existing techniques.