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柴油机前端齿轮室总成异响源识别分析与改进 被引量:2
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作者 孟浩东 李舜酩 +3 位作者 吕志翔 李殿荣 徐毅 缪岳川 《中国机械工程》 EI CAS CSCD 北大核心 2013年第17期2295-2300,共6页
针对柴油机前端齿轮室总成在常用转速下产生异响的问题,采用EEMD小波时频分析方法进行了异响源的识别分析;通过整车定置试验和台架试验分析,提取了异响源的时频特征;通过有限元模型仿真分析,计算了齿轮室总成结构的约束模态频率和振型... 针对柴油机前端齿轮室总成在常用转速下产生异响的问题,采用EEMD小波时频分析方法进行了异响源的识别分析;通过整车定置试验和台架试验分析,提取了异响源的时频特征;通过有限元模型仿真分析,计算了齿轮室总成结构的约束模态频率和振型。综合上述分析结果发现,异响原因是壳体件结构局部刚度不足引起的系统共振。通过改进齿轮室总成结构,提高了固有频率,消除了齿轮室总成异响。 展开更多
关键词 齿轮室总成 小波时频分析 异响源 仿真分析
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寻找驱动桥异响源的方法
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作者 吕纪平 《中国汽车保修设备》 2004年第4期42-43,共2页
汽车在行驶过程中,发动机或底盘均有噪声发出,正确判定噪声发出的部位、确定引起噪声和异响的有关机件,有助于迅速排除故障,使车辆恢复良好的状态。但由于驱动桥距驾驶室较远,有时异响和噪声需按比较分辨法进行确定。
关键词 驱动桥异响源 汽车 故障检测 故障排除
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某车型动态异响问题分析与解决 被引量:2
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作者 达伟伟 李硕 +2 位作者 甘雨声 周永 潘存福 《时代汽车》 2017年第7期68-68,72,共2页
整车异响是驾乘人员容易感知的质量问题,特别在乘用车上尤为关注,因此在新车项目研发过程中乃至量产后都需要重点关注和解决。以宝骏某车型为例,从仪表板、副仪表板、座椅、衣帽板、尾门等几处异响源开展异响原因分析和改进措施探讨。
关键词 感知 异响源 新产品 整改
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Related factors and regional differences in energy consumption in China
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作者 QU Xiao-e ZHU Qing YANG Yang 《Chinese Business Review》 2010年第7期27-36,共10页
This article used the Cluster analysis of statistical method to separate China's 30 provinces and municipalities into three categories according to their energy consumption discrepancies and characteristics from 1985... This article used the Cluster analysis of statistical method to separate China's 30 provinces and municipalities into three categories according to their energy consumption discrepancies and characteristics from 1985 to 2007. The categories were high, moderate and low energy consumption areas and they had significant differences in energy consumption. Based on this classification, the authors analyzed the influencing factors of energy consumption in the three areas by means of panel data econometric model. The results showed that the influencing factors were obviously different. In order to support national goal of energy conservation and emission reduction, the energy measures and policies should be distinctly taken. 展开更多
关键词 energy consumption Cluster analysis panel model econometric analysis
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Spatial Differentiation Pattern of Habitat Quality and Mechanism of Factors Influencing in Resource-based Cities:A Case Study of Tangshan City,China 被引量:6
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作者 CHENG Peng MIN Min +1 位作者 ZHAO Wei ZHAO Ke 《Journal of Resources and Ecology》 CSCD 2021年第5期636-649,共14页
The degradation of the eco-environment has been a challenge for sustainability in resource-based cities around the world.Although much attention has been drawn to this issue,few insights have been acquired regarding t... The degradation of the eco-environment has been a challenge for sustainability in resource-based cities around the world.Although much attention has been drawn to this issue,few insights have been acquired regarding the spatial differentiation and mechanism of the factors influencing habitat quality in resource-based cities from the perspective of the interactions of natural and human factors.Using Tangshan City as a case study,this paper evaluates habitat quality by integrating Ecosystem Service Value Assessment and the InVEST-HQ model,identifies the spatial distribution of Tangshan’s habitat quality with spatial auto-correlation,and explores the influencing factors and their mechanism of influence on the spatial differentiation with the geographical detector model and Space production theory.The results show that:(1)The total value of the habitat quality in Tangshan City in 2019 was 3.45×10^(10) yuan,and the habitat quality value was 24435.05 yuan ha-1.The habitat quality value presents a clustered distribution pattern of"hot in the north and the south,cold from the center to the west".(2)On the county scale,Qianxi County had the best habitat quality and Lubei District had the worst habitat quality;Shangying Township had the highest average habitat quality and Kaiping Street had the lowest average habitat quality in the township unit.(3)The results of geographical detectors show that natural environmental conditions are the important basic factors affecting the spatial differentiation of habitat quality in Tangshan City,while urbanization and industrialization factors are the most important external forces driving the spatial differentiation of habitat quality.The contributions of average elevation,average slope,raw material industrial density,and population density to the spatial differentiation of habitat quality are all above 0.40.The interactions of any two factors on habitat quality are enhanced.Areas with concentrated populations,rich industrial resources,and convenient transportation become low-value habitat quality areas;while areas with beautiful landscape patterns,abundant precipitation,and a comfortable climate become high-value habitat quality areas.Space production theory can be used to explain the mechanism of the formation of the spatial differentiation of habitat quality. 展开更多
关键词 habitat quality spatial differentiation pattern mechanism of influence geographical detector resource-based city
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