期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
工业平缝机的噪声源识别与运行噪声预测研究 被引量:5
1
作者 张志勇 刘鑫 +1 位作者 黄彩霞 谭涛 《振动与冲击》 EI CSCD 北大核心 2016年第20期220-225,共6页
为了有效控制工业平缝机的运行噪声,有必要开展噪声源识别和运行噪声预测研究。首先基于分部运行法进行平缝机振动与噪声信号的测试实验,并对采集的振动信号进行低通滤波和去趋势项处理;然后根据分部运行下的噪声功率谱密度,确定出主要... 为了有效控制工业平缝机的运行噪声,有必要开展噪声源识别和运行噪声预测研究。首先基于分部运行法进行平缝机振动与噪声信号的测试实验,并对采集的振动信号进行低通滤波和去趋势项处理;然后根据分部运行下的噪声功率谱密度,确定出主要的噪声源是刺布挑线机构和旋梭机构;最后分别以主要噪声源附近的振动加速度信号和运行噪声声压为自变量和因变量,基于核偏最小二乘回归方法建立运行噪声的预测模型,开展了运行噪声对振动加速度的敏感性分析。噪声预测模型的精度分析表明,振动加速度与噪声声压之间的非线性关系能被准确建模,运行噪声预测模型具有非常高的精度。敏感性分析进一步确定,平缝机运行噪声对刺布挑线机构Y方向的振动最敏感,其次是旋梭机构Z方向的振动。 展开更多
关键词 噪声源识别 噪声预测 分部运行 核偏最小二乘 敏感性分析 工业平缝机
下载PDF
对电站分部试运工作的一点认识
2
作者 谢国栋 《西北电力技术》 2004年第5期66-67,共2页
介绍电站分部试运前准备工作内容及试运过程中出现具体问题的解决措施和办法。
关键词 分部运行 机械振动 现场
下载PDF
China's New Nationalism and Its Obscene Core
3
作者 Guanjun Wu 《History Research》 2012年第8期514-534,共21页
This paper examines the recent current of nationalism in China's Mainland. It takes not only nationalist intellectual texts written by Wang Xiaodong and other "Say-no Club" members into critical scrutiny, but al... This paper examines the recent current of nationalism in China's Mainland. It takes not only nationalist intellectual texts written by Wang Xiaodong and other "Say-no Club" members into critical scrutiny, but also nationalistic sentiments frequently appeared on the Chinese web and streets since the late 1990s. The findings of the analyses proffered by this paper are expected to enhance not only the understanding of today's China and Chinese nationalism as a localized and "embedded" discourse/phenomenon, but also, hopefully, that of nationalism and its generative and operational mechanism in general--nationalism is an "obscene discourse" and operates in the fantastic ground while producing real violence. 展开更多
关键词 China's new nationalism bio-operation of discourse obscene supplement conceptual Japanese
下载PDF
Approximation for counts of head runs
4
作者 ZHANG Mei 《Science China Mathematics》 SCIE 2011年第2期311-324,共14页
In this paper, we study the count of head runs up to a fixed time in a two-state stationary Markov chain. We prove that in total variance distance, the negative binomial, Poisson and binomial distributions are appropr... In this paper, we study the count of head runs up to a fixed time in a two-state stationary Markov chain. We prove that in total variance distance, the negative binomial, Poisson and binomial distributions are appropriate approximations according to the relation of the variance and mean of the count, generalizing earlier results in previous literatures. The proof is based on Stein's method and coupling. 展开更多
关键词 head run negative binomial distribution Poisson distribution binomial distribution Stein's method total variation distance coupling
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部