Angebote zu "Modeling" (10 Treffer)

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Model Assisted Survey Sampling
77,99 € *
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The book covers the various approaches to modeling the in-cylinder processes such as mixture formation, combustion and formation of exhaust emissions in diesel and gasoline engines. Due to their complexity emphasis is put on multi-dimensional spray, combustion and emission formation models. However, phenomenological as well as zero-dimensional thermodynamic models, which are still widely used in engine development because of their computational efficiency, are addressed as well. Example calculations of each model type are compared with corresponding experimental data ¿ represented in diagrams as well as in images resulting from modern optical measuring techniques ¿ in order to discuss the capabilities of today's simulation models as well as the shortcomings that still exist either because of oversimplifying assumptions or because of insufficient knowledge of the real processes. The reader will be provided with an overview of the most important simulation models describing the in-cylinder processes of internal combustion engines. In addition, suggestions are made about which modeling approach is appropriate for a specific type of problem.Now available in paperback, this book provides a comprehensive account of survey sampling theory and methodology suitable for students and researchers across a variety of disciplines. It shows how statistical modeling is a vital component of the sampling process and in the choice of estimation technique. The first textbook that systematically extends traditional sampling theory with the aid of a modern model assisted outlook. Covers classical topics as well as areas where significant new developments have taken place.

Anbieter: buecher
Stand: 03.04.2020
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Modeling and Control of Raw Emissions of a Dies...
48,80 € *
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A real-time capable in-cylinder pressure based diesel engine-out PM estimator has been developed. Using the ECU signals and in-cylinder pressure data new variables have been derived and used as inputs for an exponential zero dimensional modeling approach. This approach required little computational effort making the ECU capable of cycle based PM emissions calculation, significantly faster than in real-time. Along with the PM estimator an accurate NOx emissions model has been utilized in a MIMO feedback controller motivated by the gain scheduling concept. Two types of experimental passenger car DI diesel engines, equipped with in-cylinder pressure sensors have been used. Measurements have been taken during steady state and transient operation on engine test benches for development work. Implementation of the emission models and the controller has been done on a test vehicle and tests were carried out on the test track and vehicle test bench. Good correlation between the estimated and measured PM has been achieved for various experiments, not only at steady state operation but also for transient states. Particularly, the model delivers good qualitative results in general, as well as good quantitative results in some regions. PM emission gradients between operating points are represented successfully. The raw emissions controller – despite further need for optimization – has been successful in controlling PM and NOx emissions simultaneously over EGR and pilot injection quantity. Gain scheduling has eliminated the need for an inverse combustion model. EGR and injector actuators were manipulated in a cascaded controller structure where the designed PI controllers altered reference values of the actual EGR and pilot injection quantity controllers that were already present in the system.

Anbieter: Dodax
Stand: 03.04.2020
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Modeling, Analysis and Control of Effects of th...
59,00 € *
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The planar solid-oxide fuel cells (PSOFCs) have emerged as one of the promising candidates for future energy system because of their high energy efficiency, fuel flexibility, zero emission, modularity and high tolerance to the fuel impurities.However, for large-scale commercialization of the PSOFC technology, there is a strong need of developing a reliable and highly efficient PSOFC power system. Development of such a reliable PSOFC based power system requires knowledge of the several feedback effects from the power electronics system and the application loads that may impact the PSOFC stack and the system as a whole. Therefore, it is important to develop analytical methodologies to investigate and mitigate the effects of these electrical feedbacks on the performance of PSOFC systems.On the whole, the dissertation focuses on i) the modeling and development of an effective PSOFC power-system design and system interaction analyses, ii) cost-constrained PES topology design for PSOFCS and iii) the design of cost effective optimal controller and controlling strategy for mitigation of electrical impacts with higher system efficiency.

Anbieter: Dodax
Stand: 03.04.2020
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Time Series of Streamflow of Hydropower plant &...
35,90 € *
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Hydropower, an important source of renewable energy is favored because of several important features like zero carbon emission, low operating cost, significant operating flexibility, reliability etc. The present study finds the empirical efficiency of different units of the Teesta-V hydropower project of Sikkim, a northeastern state of India. The results show that all the units of the power project perform differently, though their technical specifications are same. The study also investigates the role of different determinants of power generation in order to understand their impact on the same. It reveals that minimum inflow has significant role in non-rainy season on generation, but not in rainy season. The work also analyses the temporal behavior of inflow by modeling the same using Box-Jenkins methodology of time series analysis.

Anbieter: Dodax
Stand: 03.04.2020
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Pathways to Low-Carbon Development for the Phil...
67,90 CHF *
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This study assesses how the growth of the Philippines can be made climate friendly through a detailed modeling approach that draws on extensive national stakeholder input. The Philippines currently has a low level of per capita greenhouse gas emissions. However, emission levels are growing at an increasing rate, with 4% annual growth between 2006 and 2012. The country's energy system is becoming more carbon intensive to satisfy escalating energy demand caused by strong economic growth. This study assesses how the Philippines can take a low-carbon pathway by drawing on detailed modeling of the power, residential, and transport sectors. It identifies low-carbon development options that can be deployed at approximately zero net cost to reduce energy sector greenhouse gas emissions by 70% by 2050. With energy use levels still low, the country has an opportunity to follow a low-carbon development trajectory-if action is taken soon.

Anbieter: Orell Fuessli CH
Stand: 03.04.2020
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Pathways to Low-Carbon Development for the Phil...
7,40 CHF *
ggf. zzgl. Versand

The Philippines currently has a low level of per capita greenhouse gas emissions. However, emission levels are growing at an increasing rate, with 4% annual growth between 2006 and 2012. The country's energy system is becoming more carbon intensive to satisfy escalating energy demand caused by strong economic growth. This study assesses how the Philippines can take a low-carbon pathway by drawing on detailed modeling of the power, residential, and transport sectors. It identifies low-carbon development options that can be deployed at approximately zero net cost to reduce energy sector greenhouse gas emissions by 70% by 2050. With energy use levels still low, the country has an opportunity to follow a low-carbon development trajectory-if action is taken soon.

Anbieter: Orell Fuessli CH
Stand: 03.04.2020
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Pathways to Low-Carbon Development for the Phil...
37,99 € *
ggf. zzgl. Versand

This study assesses how the growth of the Philippines can be made climate friendly through a detailed modeling approach that draws on extensive national stakeholder input. The Philippines currently has a low level of per capita greenhouse gas emissions. However, emission levels are growing at an increasing rate, with 4% annual growth between 2006 and 2012. The country's energy system is becoming more carbon intensive to satisfy escalating energy demand caused by strong economic growth. This study assesses how the Philippines can take a low-carbon pathway by drawing on detailed modeling of the power, residential, and transport sectors. It identifies low-carbon development options that can be deployed at approximately zero net cost to reduce energy sector greenhouse gas emissions by 70% by 2050. With energy use levels still low, the country has an opportunity to follow a low-carbon development trajectory-if action is taken soon.

Anbieter: Thalia AT
Stand: 03.04.2020
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Modeling, Analaysis and Control Of Effects Of T...
53,99 € *
ggf. zzgl. Versand

The planar solid-oxide fuel cells (PSOFCs) have emerged as one of the promising candidates for future energy system because of their high energy efficiency, fuel flexibility, zero emission, modularity and high tolerance to the fuel impurities. However, for large-scale commercialization of the PSOFC technology, there is a strong need of developing a reliable and highly efficient PSOFC power system. Development of such a reliable PSOFC based power system requires knowledge of the several feedback effects from the power electronics system and the application loads that may impact the PSOFC stack and the system as a whole. Therefore, it is important to develop analytical methodologies to investigate and mitigate the effects of these electrical feedbacks on the performance of PSOFC systems. On the whole, the dissertation focuses on i) the modeling and development of an effective PSOFC power- system design and system interaction analyses, ii) cost-constrained PES topology design for PSOFCS and iii) the design of cost effective optimal controller and controlling strategy for mitigation of electrical impacts with higher system efficiency.

Anbieter: Thalia AT
Stand: 03.04.2020
Zum Angebot
Pathways to Low-Carbon Development for the Phil...
6,80 € *
ggf. zzgl. Versand

The Philippines currently has a low level of per capita greenhouse gas emissions. However, emission levels are growing at an increasing rate, with 4% annual growth between 2006 and 2012. The country's energy system is becoming more carbon intensive to satisfy escalating energy demand caused by strong economic growth. This study assesses how the Philippines can take a low-carbon pathway by drawing on detailed modeling of the power, residential, and transport sectors. It identifies low-carbon development options that can be deployed at approximately zero net cost to reduce energy sector greenhouse gas emissions by 70% by 2050. With energy use levels still low, the country has an opportunity to follow a low-carbon development trajectory-if action is taken soon.

Anbieter: Thalia AT
Stand: 03.04.2020
Zum Angebot