The noise prediction of the turbocharger is studied.The broadband noise source model is employed to predict the near-field noise of the turbocharger.The 3D software Solidworks is adopted to establish the model blades ...The noise prediction of the turbocharger is studied.The broadband noise source model is employed to predict the near-field noise of the turbocharger.The 3D software Solidworks is adopted to establish the model blades and inlet of turbocharger compressor,then this 3D model is introduced into the software CFD to calculate the flow-field under different inlet shapes,different blades shapes and different clearances between casing and impeller.On the base of the above simulation,the broadband noise source model is employed to calculate and analyze the near-field noise.The calculation shows that compressor static pressure values and the sound power values near the impeller outlet are the largest.Through the noise calculation by using broadband noise source model under different inlet shapes and blade shapes,we find that the noise level of the inlet of cylindrical and cone types are smaller.Compared with the current widespread used backward skewed or radial blades,there is little difference of the noise value of the inlet of the forward skewed blades.展开更多
Broadband network plays an increasingly important strategic role in the development of new rural economy,society and culture.Based on the analysis of the construction of rural agricultural informatization and existing...Broadband network plays an increasingly important strategic role in the development of new rural economy,society and culture.Based on the analysis of the construction of rural agricultural informatization and existing problems in our country,this paper gives the path selection and measures of " broadband village" combined with regional characteristics to select the construction path of " broadband village",it needs to build the long term mechanism of " broadband village" investment and financing,determine the goal of the regional construction of " broadband village" and focus on promoting the development of rural informatization services.展开更多
针对目前油气管道现场层网络通信带宽低、时延差及组网复杂的现状,以及油气管道智能化管理的需求,在油气管道现场层网络中引入IEC 61158 Type 28宽带现场总线国际标准技术,以提高数据通信的带宽和实时性,并实现多业务数据融合通信。根...针对目前油气管道现场层网络通信带宽低、时延差及组网复杂的现状,以及油气管道智能化管理的需求,在油气管道现场层网络中引入IEC 61158 Type 28宽带现场总线国际标准技术,以提高数据通信的带宽和实时性,并实现多业务数据融合通信。根据油气管道网络工程的实际应用,基于该宽带现场总线提出了一种新型的油气管道高速总线(PHB)标准技术,用于指导用户进行新型油气管道网络工程实施和业务部署。本文对PHB网络中的3种设备模型:主站、从站和代理,以及基于该设备模型的单环形和双环形总线网络模型等内容进行研究,并通过撬装平台验证了设备模型方案的可行性与可靠性。展开更多
基金Sponsored by the National Natural Science Foundation of China (50875022)Research Foundation of Beijing Institute of Technology(20070342012)
文摘The noise prediction of the turbocharger is studied.The broadband noise source model is employed to predict the near-field noise of the turbocharger.The 3D software Solidworks is adopted to establish the model blades and inlet of turbocharger compressor,then this 3D model is introduced into the software CFD to calculate the flow-field under different inlet shapes,different blades shapes and different clearances between casing and impeller.On the base of the above simulation,the broadband noise source model is employed to calculate and analyze the near-field noise.The calculation shows that compressor static pressure values and the sound power values near the impeller outlet are the largest.Through the noise calculation by using broadband noise source model under different inlet shapes and blade shapes,we find that the noise level of the inlet of cylindrical and cone types are smaller.Compared with the current widespread used backward skewed or radial blades,there is little difference of the noise value of the inlet of the forward skewed blades.
基金Supported by Jiangsu Modern Information Services Decision and Consulting Research Base Project(NYJD217010)Philosophy and Social Science Research Project of Jiangsu Universities(2014SJB006)
文摘Broadband network plays an increasingly important strategic role in the development of new rural economy,society and culture.Based on the analysis of the construction of rural agricultural informatization and existing problems in our country,this paper gives the path selection and measures of " broadband village" combined with regional characteristics to select the construction path of " broadband village",it needs to build the long term mechanism of " broadband village" investment and financing,determine the goal of the regional construction of " broadband village" and focus on promoting the development of rural informatization services.
文摘针对目前油气管道现场层网络通信带宽低、时延差及组网复杂的现状,以及油气管道智能化管理的需求,在油气管道现场层网络中引入IEC 61158 Type 28宽带现场总线国际标准技术,以提高数据通信的带宽和实时性,并实现多业务数据融合通信。根据油气管道网络工程的实际应用,基于该宽带现场总线提出了一种新型的油气管道高速总线(PHB)标准技术,用于指导用户进行新型油气管道网络工程实施和业务部署。本文对PHB网络中的3种设备模型:主站、从站和代理,以及基于该设备模型的单环形和双环形总线网络模型等内容进行研究,并通过撬装平台验证了设备模型方案的可行性与可靠性。
