准确计算户内变电站大型、复杂的噪声场分布,进而评价可采用降噪措施的减噪效果,是解决户内变电站噪声污染的关键问题。为此,综合声学有限元法(finite element method,FEM)求解复杂声场收敛性好及精度高的优点,及声学边界元法(boundary ...准确计算户内变电站大型、复杂的噪声场分布,进而评价可采用降噪措施的减噪效果,是解决户内变电站噪声污染的关键问题。为此,综合声学有限元法(finite element method,FEM)求解复杂声场收敛性好及精度高的优点,及声学边界元法(boundary element method,BEM)降维求解大型声场的优势,提出了一种基于声学FEM-BEM的户内变电站噪声场求解算法。首先,建立变电站内部声源声固耦合模型,采用声学FEM求解混响噪声作用下的声固耦合响应;然后,基于声学FEM-BEM耦合理论,求解内、外耦合边界处结构单元受声固耦合激励产生的位移及应力载荷;最后,根据声压及应力载荷激发的外场声波扩散模型,基于常规Gauss数值积分法,建立外部空间声域2维BEM声学积分方程,求解外部声场。该算法在湖南某110 kV户内变电站噪声场的求解分析中得到了成功应用,与实测值的相对误差为3.61%~4.87%。展开更多
To enrich the specific methods of narrative clinical practice in Chinese medicine and stimulate the innovation of narrative medicine practice in China,we advise that medical professionals should integrate theories and...To enrich the specific methods of narrative clinical practice in Chinese medicine and stimulate the innovation of narrative medicine practice in China,we advise that medical professionals should integrate theories and treatments related to acupuncture,massage and positive psychology into their narrative medicine practice,taking into account the current state of clinical practice of acupuncturists and the importance of positive emotions in the field of psychology.This paper elucidates the value of combining acupuncture,massage,and positive psychology from the perspectives of mechanisms and clinical correlations,highlighting their impacts on patients'physical and mental health.To promote the integration of positive psychology with acupuncture and massage,it is proposed to refine the understanding of the efficacy of acupuncture points and develop theories on stimulating positive psychology in acupuncture and massage further more.展开更多
文摘准确计算户内变电站大型、复杂的噪声场分布,进而评价可采用降噪措施的减噪效果,是解决户内变电站噪声污染的关键问题。为此,综合声学有限元法(finite element method,FEM)求解复杂声场收敛性好及精度高的优点,及声学边界元法(boundary element method,BEM)降维求解大型声场的优势,提出了一种基于声学FEM-BEM的户内变电站噪声场求解算法。首先,建立变电站内部声源声固耦合模型,采用声学FEM求解混响噪声作用下的声固耦合响应;然后,基于声学FEM-BEM耦合理论,求解内、外耦合边界处结构单元受声固耦合激励产生的位移及应力载荷;最后,根据声压及应力载荷激发的外场声波扩散模型,基于常规Gauss数值积分法,建立外部空间声域2维BEM声学积分方程,求解外部声场。该算法在湖南某110 kV户内变电站噪声场的求解分析中得到了成功应用,与实测值的相对误差为3.61%~4.87%。
文摘To enrich the specific methods of narrative clinical practice in Chinese medicine and stimulate the innovation of narrative medicine practice in China,we advise that medical professionals should integrate theories and treatments related to acupuncture,massage and positive psychology into their narrative medicine practice,taking into account the current state of clinical practice of acupuncturists and the importance of positive emotions in the field of psychology.This paper elucidates the value of combining acupuncture,massage,and positive psychology from the perspectives of mechanisms and clinical correlations,highlighting their impacts on patients'physical and mental health.To promote the integration of positive psychology with acupuncture and massage,it is proposed to refine the understanding of the efficacy of acupuncture points and develop theories on stimulating positive psychology in acupuncture and massage further more.
