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智能驾驶-AI芯片的算力研究 被引量:2
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作者 于继成 王强 +1 位作者 赵目龙 焦育成 《汽车文摘》 2019年第1期31-36,共6页
在一汽对红旗汽车智能化工作推进的背景下,L3级有条件自动驾驶及L4、L5级全自动驾驶提上工作日程。自动驾驶功能的实现离不开具有强大计算能力的硬件平台,而硬件计算平台的核心则是负责完成海量传感器数据采集、处理、分析工作的AI性能... 在一汽对红旗汽车智能化工作推进的背景下,L3级有条件自动驾驶及L4、L5级全自动驾驶提上工作日程。自动驾驶功能的实现离不开具有强大计算能力的硬件平台,而硬件计算平台的核心则是负责完成海量传感器数据采集、处理、分析工作的AI性能芯片。本文对AI芯片的计算能力表示单位及算力计算公式进行解释说明,同时对自动驾驶硬件方案所采用的主流AI芯片的算力进行分析统计,最后对AI芯片的应用选型提出建议。 展开更多
关键词 智能驾驶 单位 算力计算方法 对比分析
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Modeling the Axial Balancing Mechanism of Orbit Annular Hydraulic Machines 被引量:1
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作者 Fabrizio Grasselli Massimo Milani Luca Montorsi Fabrizio Paltrinieri 《Journal of Energy and Power Engineering》 2013年第10期1946-1956,共11页
A customized combined methodology based on both 2D CFD (computational fluid dynamics) and lumped parameters numerical modeling, useful for simulating the hydraulic behavior of orbit annular machines, has been develo... A customized combined methodology based on both 2D CFD (computational fluid dynamics) and lumped parameters numerical modeling, useful for simulating the hydraulic behavior of orbit annular machines, has been developed and here presented. More in details, the predictive capabilities of this CAE (computer-aided engineering) tool can be applied for the study of both roller and gerotor architectures and considering both pumping and motoring operating mode. First of all, an in-house developed 2D CFD methodology, based on the integration of the stationary form of the Reynolds equation for the determination of the pressure distribution inside the lateral clearances bounded by the sides of the stator-rotor group and the valve plate, as well as the internal manifold surface, is firstly presented and applied. The same computational procedure has been also involved for the investigation of the leakages through the clearance between the valve plate and the balancing ring. After that, a lumped and distributed parameters numerical model has been involved for the simulation of a typical orbit roller motor operation. In this case, particular care has been devoted to the modeling of the axial leakage clearances, adopting analytical interpolation functions deducted from the numerical results calculated applying the previously described 2D CFD methodology. Finally, the whole CAE approach has been validated by means of a comprehensive numerical versus experimental comparison, obtaining a general good accordance for the overall operating field of this particular type of hydraulic unit. 展开更多
关键词 HYDRAULIC motor ORBIT CFD CAE Reynolds.
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Numerical Prediction of Flow Patterns after Various Pipe Fittings
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作者 Andreas Swienty Raja Abou Ackl Paul Uwe Thamsen 《Journal of Mechanics Engineering and Automation》 2015年第10期542-548,共7页
An accurate prediction of flows using CFD depends on a large number of factors. In addition to discretizing the flow region, the correct definition of boundary or initial conditions and the choice of suitable numerica... An accurate prediction of flows using CFD depends on a large number of factors. In addition to discretizing the flow region, the correct definition of boundary or initial conditions and the choice of suitable numerical methods, the applied turbulence model influences the results of the flow simulation to a great extent. Therefore, a validation of the results with the experimental data is of great importance for a correct selection of a turbulence model. It is the scope of this paper to assess different turbulence models for the simulation of pipe flows. The calculation results of pipe flows through a combination of 90~ elbows and a 1/3 segmental orifice are compared with experimental measurement results. This has the advantage that the suitability of the turbulence models for simulating both shear and swirl flows can be investigated. Thus, the k-ω, k-ε model and the Launder Reece Rodi Reynolds stress model are compared with each other and experimental results. Furthermore, this investigation is extended through including a much more c detached-eddy simulation. This model provides better prediction of the flow by resolving the large eddies and modeling the small ones. The experimental results originate from LDV measurements over the entire pipe cross-section. This measuring method provides velocity vectors over the measured surface. 展开更多
关键词 CFD turbulence models k-ε k-ω LRR DES.
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