探索了“电子技术”课程JIT(Just In Time,即时)实验辅助课堂教学的课程改革。通过分析教学中存在的问题,优化了教学内容,搭建了灵活、便携的JIT实验平台,设计了JIT实验用例。课堂实践结果表明,JIT实验辅助教学激发了学生的学习热情,提...探索了“电子技术”课程JIT(Just In Time,即时)实验辅助课堂教学的课程改革。通过分析教学中存在的问题,优化了教学内容,搭建了灵活、便携的JIT实验平台,设计了JIT实验用例。课堂实践结果表明,JIT实验辅助教学激发了学生的学习热情,提高了学生的工程实践能力,收到良好的教学效果。展开更多
The two-archive 2 algorithm(Two_Arch2) is a manyobjective evolutionary algorithm for balancing the convergence,diversity,and complexity using diversity archive(DA) and convergence archive(CA).However,the individuals i...The two-archive 2 algorithm(Two_Arch2) is a manyobjective evolutionary algorithm for balancing the convergence,diversity,and complexity using diversity archive(DA) and convergence archive(CA).However,the individuals in DA are selected based on the traditional Pareto dominance which decreases the selection pressure in the high-dimensional problems.The traditional algorithm even cannot converge due to the weak selection pressure.Meanwhile,Two_Arch2 adopts DA as the output of the algorithm which is hard to maintain diversity and coverage of the final solutions synchronously and increase the complexity of the algorithm.To increase the evolutionary pressure of the algorithm and improve distribution and convergence of the final solutions,an ε-domination based Two_Arch2 algorithm(ε-Two_Arch2) for many-objective problems(MaOPs) is proposed in this paper.In ε-Two_Arch2,to decrease the computational complexity and speed up the convergence,a novel evolutionary framework with a fast update strategy is proposed;to increase the selection pressure,ε-domination is assigned to update the individuals in DA;to guarantee the uniform distribution of the solution,a boundary protection strategy based on I_(ε+) indicator is designated as two steps selection strategies to update individuals in CA.To evaluate the performance of the proposed algorithm,a series of benchmark functions with different numbers of objectives is solved.The results demonstrate that the proposed method is competitive with the state-of-the-art multi-objective evolutionary algorithms and the efficiency of the algorithm is significantly improved compared with Two_Arch2.展开更多
为了准确和快速地估算电动汽车运行过程中汽车电池的荷电状态(State of Charge,SOC)和健康状态(State of Health,SOH),提出一种基于遗忘因子最小二乘和可变时间尺度扩展卡尔曼滤波器的自适应联合估算算法。为了提高算法的效率和准确度,...为了准确和快速地估算电动汽车运行过程中汽车电池的荷电状态(State of Charge,SOC)和健康状态(State of Health,SOH),提出一种基于遗忘因子最小二乘和可变时间尺度扩展卡尔曼滤波器的自适应联合估算算法。为了提高算法的效率和准确度,引入自适应遗忘因子递归最小二乘(Adaptive Forgetting Factor Recursive Least Square,AFFRLS)方法来识别电池模型中的参数,并采用可变时间尺度扩展卡尔曼滤波器(Variable Time Scale Extended Kalman Filter,VEKF)来指示SOC和SOH,以满足对电池动态状况进行在线快速估算的需求。应用动态应力测试(Dynamic Stress Test,DST)数据库验证了该方法的有效性,实验结果表明,该联合估算方法可以获取准确的电池模型,并实现在线状态估算。展开更多
基金supported by the National Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang Province (52077203,LY19E070003)the Fundamental Research Funds for the Provincial Universities of Zhejiang (2021YW06)。
文摘The two-archive 2 algorithm(Two_Arch2) is a manyobjective evolutionary algorithm for balancing the convergence,diversity,and complexity using diversity archive(DA) and convergence archive(CA).However,the individuals in DA are selected based on the traditional Pareto dominance which decreases the selection pressure in the high-dimensional problems.The traditional algorithm even cannot converge due to the weak selection pressure.Meanwhile,Two_Arch2 adopts DA as the output of the algorithm which is hard to maintain diversity and coverage of the final solutions synchronously and increase the complexity of the algorithm.To increase the evolutionary pressure of the algorithm and improve distribution and convergence of the final solutions,an ε-domination based Two_Arch2 algorithm(ε-Two_Arch2) for many-objective problems(MaOPs) is proposed in this paper.In ε-Two_Arch2,to decrease the computational complexity and speed up the convergence,a novel evolutionary framework with a fast update strategy is proposed;to increase the selection pressure,ε-domination is assigned to update the individuals in DA;to guarantee the uniform distribution of the solution,a boundary protection strategy based on I_(ε+) indicator is designated as two steps selection strategies to update individuals in CA.To evaluate the performance of the proposed algorithm,a series of benchmark functions with different numbers of objectives is solved.The results demonstrate that the proposed method is competitive with the state-of-the-art multi-objective evolutionary algorithms and the efficiency of the algorithm is significantly improved compared with Two_Arch2.
文摘为了准确和快速地估算电动汽车运行过程中汽车电池的荷电状态(State of Charge,SOC)和健康状态(State of Health,SOH),提出一种基于遗忘因子最小二乘和可变时间尺度扩展卡尔曼滤波器的自适应联合估算算法。为了提高算法的效率和准确度,引入自适应遗忘因子递归最小二乘(Adaptive Forgetting Factor Recursive Least Square,AFFRLS)方法来识别电池模型中的参数,并采用可变时间尺度扩展卡尔曼滤波器(Variable Time Scale Extended Kalman Filter,VEKF)来指示SOC和SOH,以满足对电池动态状况进行在线快速估算的需求。应用动态应力测试(Dynamic Stress Test,DST)数据库验证了该方法的有效性,实验结果表明,该联合估算方法可以获取准确的电池模型,并实现在线状态估算。