Chong Wang - Böcker

Controlling the level of noise in electrical motors is critical to overall system performance. However, predicting noise of an electrical motor is more difficult and less accurate than for other characteristics such as torque-speed. Recent advances have produced powerful computational methods for noise prediction, and Noise of Polyphase Electric Motors is the first book to collect these advances in a single source. It is also the first to include noise prediction for permanent magnet (PM) synchronous motors.Complete coverage of all aspects of electromagnetic, structural, and vibro-acoustic noise makes this a uniquely comprehensive reference. The authors begin with the basic principles of noise generation and radiation, magnetic field and radial forces, torque pulsations, acoustic calculations, as well as noise and vibration of mechanical and acoustic origin. Moving to applications, the book examines in detail stator system vibration analysis including the use of finite element method (FEM) modal analysis; FEM for radial pressure and structural modeling; boundary element methods (BEM) for acoustic radiation; statistical energy analysis (SEA); instrumentation including technologies, procedures, and standards; and both passive and active methods for control of noise and vibration.Noise of Polyphase Electric Motors gathers the fundamental concepts along with all of the analytical, numerical, and statistical methods into a unified reference. It supplies all of the tools necessary to improve the noise performance of electrical motors at the design stage.

POWER GRID RESILIENCE AGAINST NATURAL DISASTERS How to protect our power grids in the face of extreme weather events The field of structural and operational resilience of power systems, particularly against natural disasters, is of obvious importance in light of climate change and the accompanying increase in hurricanes, wildfires, tornados, frigid temperatures, and more. Addressing these vulnerabilities in service is a matter of increasing diligence for the electric power industry, and as such, targeted studies and advanced technologies are being developed to help address these issues generally—whether they be from the threat of cyber-attacks or of natural disasters. Power Grid Resilience against Natural Disasters provides, for the first time, a comprehensive and systematic introduction to resilience-enhancing planning and operation strategies of power grids against extreme events. It addresses, in detail, the three necessary steps to ensure power grid success: the preparedness prior to natural disasters, the response as natural disasters unfold, and the recovery after the event. Crucially, the authors put forward state-of-the-art methods towards improving today’s practices in managing these three arenas. Power Grid Resilience against Natural Disasters readers will also find: Data, tables, and illustrations to supplement and clarify the points put forward in each chapterCase studies on realistic power systems and industry standards and practices related to the topics coveredPotential to be a supplementary text in advanced level power engineering coursesPower Grid Resilience against Natural Disasters will be of interest to specialists and engineers, as well as planners and operators from industry. It can also be a useful resource for senior undergraduate students, postgraduate students, researchers, and research libraries. More, it will appeal to all readers with a strong background in power system analysis, operation and control, optimization methods, the Markov decision process, and probability and statistics.

This book reflects the chronological changes in Chinese cultural values, social relations, economy and politics by critically analyzing the Chinese advertising discourse. The work is based on research into the ideological values portrayed in Chinese household appliance advertisements in the 1980s – 1990s. The analytical framework covers a variety of methods: critical discourse analysis, chronological analysis, visual and verbal analysis, and qualitative and quantitative analysis. The findings suggest that ideological values consciously or unconsciously manifested by the visual and verbal devices in the Chinese advertisements moved in a pattern from simplicity to diversity, from being politically-oriented to being economically and profit-oriented, from conservatism to globalization and westernization, in keeping with the progression of the Chinese economic reform. The findings further indicate that the ideological values in the Chinese household appliance advertisements are embedded in the advertising language and illustrations. Lastly, the work reveals the reality of Chinese politics, economy and society at a time when China experienced the growth of the market economy and evolution of Chinese mainstream ideologies, and demonstrates the impacts of these changes on the ideological meanings in advertisements. This book will help readers discover the more profound meanings behind the superficial content of Chinese advertisements.