The dynamic elasticity modulus(Ed)is the most commonly used indexes for nondestructive testing to represent the internal damage of hydraulic concrete.Samples with a specific size is required when the transverse resona...The dynamic elasticity modulus(Ed)is the most commonly used indexes for nondestructive testing to represent the internal damage of hydraulic concrete.Samples with a specific size is required when the transverse resonance method was used to detect the Ed,resulting in a limitation for field tests.The impact-echo method can make up defects of traditional detection methods for frost-resistance testing,such as the evaluation via the loss of mass or strength.The feasibility of the impact-echo method to obtain the relative Ed is explored to detect the frost-resistance property of large-volume hydraulic concretes on site.Results show that the impact-echo method can replace the traditional resonance frequency method to evaluate the frost resistance of concrete,and has advantages of high accuracy,easy to operate,and not affecting by the aggregate size and size effect of samples.The dynamic elastic modulus of concrete detected by the impact-echo method has little difference with that obtained by the traditional resonance method.The one-dimensional elastic wave velocity of concrete has a good linear correlation with the transverse resonance frequency.The freeze-thaw damage occurred from the surface to the inner layer,and the surface is expected to be the most vulnerable part for the freeze-thaw damage.It is expected to monitor and track the degradation of the frost resistance of an actual structure by frequently detecting the P-wave velocity on site,which avoids coring again.展开更多
在“双碳”背景下,为解决当今综合能源微电网(integrated energy microgrid,IEM)往往独立运行而导致能源浪费和不平衡分配的问题,构建了一种基于纳什均衡博弈框架的微电网集群电能共享模型。模型考虑源荷双重不确定性,提高了微电网运行...在“双碳”背景下,为解决当今综合能源微电网(integrated energy microgrid,IEM)往往独立运行而导致能源浪费和不平衡分配的问题,构建了一种基于纳什均衡博弈框架的微电网集群电能共享模型。模型考虑源荷双重不确定性,提高了微电网运行的鲁棒性。其次,设计了一种改进交替方向乘子算法(alternating direction method of multipliers,ADMM)对微电网集群经营成本进行求解,验证了算法和模型的有效性并加快了运算收敛速度。最后,提出基于纳什均衡的效益分配策略,以贡献度综合评估各主体的谈判力指标,保证微电网集群内各主体收益的公平分配。算例分析表明所提模型可快速求出内部交易的电量与电价,最大程度降低微电网集群经营成本的同时也降低了碳排放量。展开更多
基金Hainan Provincial Natural Science Foundation of China(522QN279)Research Lab Construction of Hainan University(ZY2019HN0904).
文摘The dynamic elasticity modulus(Ed)is the most commonly used indexes for nondestructive testing to represent the internal damage of hydraulic concrete.Samples with a specific size is required when the transverse resonance method was used to detect the Ed,resulting in a limitation for field tests.The impact-echo method can make up defects of traditional detection methods for frost-resistance testing,such as the evaluation via the loss of mass or strength.The feasibility of the impact-echo method to obtain the relative Ed is explored to detect the frost-resistance property of large-volume hydraulic concretes on site.Results show that the impact-echo method can replace the traditional resonance frequency method to evaluate the frost resistance of concrete,and has advantages of high accuracy,easy to operate,and not affecting by the aggregate size and size effect of samples.The dynamic elastic modulus of concrete detected by the impact-echo method has little difference with that obtained by the traditional resonance method.The one-dimensional elastic wave velocity of concrete has a good linear correlation with the transverse resonance frequency.The freeze-thaw damage occurred from the surface to the inner layer,and the surface is expected to be the most vulnerable part for the freeze-thaw damage.It is expected to monitor and track the degradation of the frost resistance of an actual structure by frequently detecting the P-wave velocity on site,which avoids coring again.
文摘在“双碳”背景下,为解决当今综合能源微电网(integrated energy microgrid,IEM)往往独立运行而导致能源浪费和不平衡分配的问题,构建了一种基于纳什均衡博弈框架的微电网集群电能共享模型。模型考虑源荷双重不确定性,提高了微电网运行的鲁棒性。其次,设计了一种改进交替方向乘子算法(alternating direction method of multipliers,ADMM)对微电网集群经营成本进行求解,验证了算法和模型的有效性并加快了运算收敛速度。最后,提出基于纳什均衡的效益分配策略,以贡献度综合评估各主体的谈判力指标,保证微电网集群内各主体收益的公平分配。算例分析表明所提模型可快速求出内部交易的电量与电价,最大程度降低微电网集群经营成本的同时也降低了碳排放量。
