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Increasing realism in modelling energy losses in railway vehicles and their impact to energy-efficient train control

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Railway Engineering Science 2024年第3期32卷 257-285页

作者： Michael Nold Francesco Corman Institute for Transport Planning and Systems ETH ZürichZürichSwitzerland

The reduction of energy consumption is an increasingly important topic of the railway ***-efficient train control(EETC)is one solution,which refers to mathematically computing when to accelerate,which cruising speed to hold,how long one should coast over a suitable space,and when to *** approaches in literature and industry greatly simplify a lot of nonlinear effects,such that they ignore mostly the losses due to energy conversion in traction components and *** fill this research gap,a series of increasingly detailed nonlinear losses is described and *** categorize an increasing detail in this representation as four *** study the impact of those levels of detail on the energy optimal speed *** do this,a standard approach based on dynamic programming is used,given constraints on total travel *** evaluation of multiple test cases highlights the influence of the dynamic losses and the power consumption of auxiliary components on railway trajectories,also compared to multiple *** results show how the losses can make up 50%of the total energy consumption for an exemplary *** them would though result in consistent but limited errors in the optimal ***,more complex trajectories can result in less energy consumption when including the complexity of nonlinear losses than when a simpler model is *** effects are stronger when the trajectory includes many acceleration and braking phases.

关键词： Train trajectory optimization Energy-efficient train control(EETC) dynamic efficiency Power losses in railway vehicles

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Clock Controlled Hybrid-latch flip-flops Design 11th

Clock Controlled Hybrid-latch flip-flops Design

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2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology(ICSICT-2012)

作者： Jia Song Yan Shilin Wu Fengfeng Wang Yuan Key Laboratory of Microelectronics Devices and Circuits（MOE） Institute of Microelectronics Peking University

ISBN: (纸本)9781467324748

In order to obtain power efficient flip-flops,two novel Hybrid-latch schemes are introduced in this paper. They achieve high performance by shortening the critical data path and power efficiency by eliminating the inverter chain pulse *** simulation under SMIC 90nm process revealed that the two new flip-flop have excellent power and speed performance compared to the referenced *** can reduce 44.5% and 51.4% power dissipation,29.2% and 44.5% clock-to-output latency and 65.6% and 68.4% PDP.

关键词： reduce dissipation referenced Reduce speed performance channels (data transmission) dynamic efficiency Reduce Depletion Timing devices flip-flops HIGH-PERFORMANCE COPPER ALLOY NO 445

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Theory of an Optimal dynamical Water Resource Management Policy

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Journal of Water Resource and Protection 2023年第3期15卷 85-113页

作者： Muhammad Ashfaq Ahmed Nasreen Nawaz Federal Board of Revenue Islamabad Pakistan

Water markets even though not perfect and require a lot of effort to establish are considered as a robust tool to address water management issues around the world. However, the existing literature does not provide an optimal water resource management policy. To create a perfect water market, the government needs to identify the potential number of suppliers/producers and consumers of water against various extraction/supply/production rates of water, i.e., to identify a supply and a demand curve for number of suppliers/producers of water against each production rate in economy. This article presents a theory which is practically applicable for an optimal dynamical water resource management policy (JEL H20, H23, H27).

关键词： Water Market Production Rate dynamic efficiency Adjustment Path Equilibrium

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PRESSURE BUCK SWITCHMODE HYDRAULIC POWER SUPPLY WITH RETURN PRESSURE

PRESSURE BUCK SWITCHMODE HYDRAULIC POWER SUPPLY WITH RETURN ...

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第四届流体传动国际会议

作者： Zhang Xiaofeng, Gu Linyi The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, 310027 Hangzhou,China

Switchmode hydraulic power supply is a new kind of energy-saving pressure convert device. In this paper, a new type of pressure buck switchmode hydraulic power supply is put forward, in which a return pressure is introduced to increase its instantaneous efficiency. Simulations show that the total efficiency is increased considerably although the introduction of throttle lost in the return-to-tank pipe.

关键词： switchmode hydraulic power supply pressure buck hydraulic inductor hydraulic capacitor dynamic efficiency instantaneous efficiency

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中国高技术产业技术创新三阶段特征及其演变

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产业经济 2015年第9期

作者：刘树林姜新蓬余谦

基于投入产出分析的逻辑思路建立技术创新三阶段模型，运用链式网络DEA方法测量我国高技术产业技术创新三阶段效率，通过技术创新效率的动态变化观察高技术产业技术创新演变规律。研究发现，1996-2011年我国高技术产业技术开发阶段经历... 详细信息

基于投入产出分析的逻辑思路建立技术创新三阶段模型，运用链式网络DEA方法测量我国高技术产业技术创新三阶段效率，通过技术创新效率的动态变化观察高技术产业技术创新演变规律。研究发现，1996-2011年我国高技术产业技术开发阶段经历了整体上类似“U”形的变化，源于技术开发阶段的投入增多、企业重视力度加大；技术转化阶段滞后于技术开发阶段近两年的变化时期，主要起因于纯技术无效率、技术开发阶段和产业化阶段的脱节；产业化阶段滞后于技术开发阶段近5年的变化时期和技术转化阶段近3年的变化时期，主要由于产业化阶段作为技术开发和技术转化的下游阶段，偏低的技术转化率必然导致最终的产业化率极低，但改进的空间很大。

关键词：链式网络 DEA模型技术创新三阶段演变动态效率 chained network DEA model technical innovation three-stage evolution dynamic efficiency

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