为了预测薄壁件铣削过程颤振的发生,提出了一种应用小波系数特征和多类超球支持向量机进行铣削颤振预报的方法.首先基于连续小波变换分别提取高、低频段铣削振动信号的特征,然后利用多类超球支持向量机进行稳定铣削状态、铣削颤振孕育状态、铣削颤振状态识别.为了简化支持向量机进行多类分类时所带来的计算复杂性,该算法使每一类样本都获得一个超球支持向量机,在特征空间中以测试样本与超球中心距离、超球半径作为决策函数来进行识别.实验表明,在铣削颤振识别系统中多类双核超球支持向量机与连续小波系数特征向量相结合具有良好的识别效果,颤振孕育预报正确率达98.0％.

关键词：颤振预报；小波系数；超球支持向量机；多类支持向量机

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Gas analyzers are instruments that analyze a mixture of gases to measure the physical and physiochemical properties of the gas mixture. These instruments are also used to detect the gas composites and monitor the level of each gas present in the gas mixture. Gas analyzers can be categorized into two types, namely online and offline gas analyzers. Online gas analyzers provide faster and more efficient analysis and outputs than offline gas analyzers. These analyzers are widely used for environment monitoring applications to monitor the greenhouse gases and other pollutants emitted by manufacturing plants. Online gas analyzers are also used across various industries to monitor air pollutants in order to meet the regulations implemented by several governments across the world.

关键词：气体分析仪；分析测量；混合物；工具

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关键词：智能传感器；传感器网络

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Spectroscopy is a technique that is used to analyze the elements or compounds found in substances. This analysis is conducted with the help of spectral instruments by measuring the radiation intensity as a function of the wavelength. The spectral instruments used in spectroscopy are referred to as spectrometers or spectral analyzers. It can be used to determine the mass, structure, and composition of the substance under consideration. Spectroscopy analyzes the substances in the most effective way and produces accurate results. These results are helpful in yielding technological innovations in various areas such as pharmaceutical research, scientific research in biotechnology and life sciences, and industrial processes that include automotive, semiconductor, and metal mining applications.The Global Spectroscopy market is expected to grow at a moderate rate during the period 2012-2016. In terms of regional distribution, the Americas dominated the market, accounting for the highest share of the total revenue in 2012. The Americas was followed by the EMEA and the APAC regions. The overall market is forecast to grow at a CAGR of 5.2 percent during the forecast period.

关键词：光谱仪器；光谱技术；分析物质；元素；化合物

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本报告是独特的研究中国各行业的工具。它包括对宏观环境的描述、对投资吸引力的分析、详细的收入分析以及对广泛的财务比率的深度分析。

关键词：地质勘探；地震专用仪器；趋势分析

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A gas analyzer is an instrument that analyzes a mixture of gases to measure the physical and physiochemical properties of the gas mixture. It is also used to detect the gas composites and monitor the level of each gas in the gas mixture. Gas analyzers can be categorized into two types: online and offline gas analyzers. Online gas analyzers provide faster and cheaper analysis and outputs than offline gas analyzers. Online gas analyzers are widely used for environment monitoring applications to monitor the greenhouse gases and other pollutants from manufacturing plants.China is one of the key leading countries in the Global Online Gas Analyzer market. The market is growing faster in China than in many developed and developing countries because of the emergence of various process manufacturing industries in China. The Online Gas Analyzer market in China is expected to grow at a CAGR of 12.81 percent during the period 2012–2016.

关键词：气体分析仪；在线气体分析仪；离线气体分析仪

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Scientific instruments provide an efficient, accurate, easy and cost-effective method for measuring quality-related parameters. There are several types of scientific instruments such as automotive instruments, electricity instruments, special purpose instruments, navigational, meteorological and marine instruments, environmental control instruments, and geological prospecting and earthquake instruments. These instruments are adopted by companies across the industries for applications such as superior product development and to take the necessary operational measures based on the findings of the scientific instruments. Furthermore, scientific instruments from China are exported to countries across the globe as they are more cost-effective than the scientific instruments available in other countries.The Scientific Instrument market in China is one of the steadily growing Engineering markets in China because of the increasing adoption of scientific instruments across China. East China dominates the Scientific Instrument market in China and it is followed by Middle-south China.Overall, the market is expected to witness an improvement in its growth rate and post a CAGR of 10.89 percent during the period 2011–2015.

关键词：科学仪器；工程市场；增加产品质量

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关键词：智能；仪器仪表；发展趋势

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关键词：仪器行业；产业需求；市场收入

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计量仪表的需求与城镇化和智能化息息相关。近年来，电表智能化大力推广，成效显著，而燃气表、水表、热量表的推广和智能化也即将进入快速发展期。在此过程中，份额领先、具有自主知识产权和技术储备的智能计量仪表企业有望在竞争中脱颖而出，取得远高于行业的增长。

关键词：仪表；智能化；城镇化；行业增长

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