共查询到18条相似文献,搜索用时 187 毫秒
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《中国高新技术企业评价》2017,(2)
文章研究了针对齿式离心压缩机机组转子系统,对一台激冷气压缩机的振动波动情况进行故障诊断并予以解决。首先利用频谱监测方法得到机组时域波形、瀑布图、趋势曲线、FFT频谱;然后通过与典型故障振动特征、敏感参数进行对比,得出气流激振是造成机组大幅度波动的原因;最后通过改进密封结构对气流激振进行抑制改善机组振动情况。 相似文献
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《中国高新技术企业评价》2015,(22)
在镗削加工过程中会产生自激振动,当振动量超过允许的范围时振动会加剧,影响机床的工作性能,使机床的零部件产生附加动载荷,减少零件的寿命。通过加深对自激振动有关理论的分析,可以合理改善刀具镗杆结构,设计带有撞击块的刀杆,起到消振器的作用,稳定切削区加工零件,能够有效避免镗削加工中的有害自激振动。 相似文献
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高桥墩长窄桥梁横向振动在结构振动中占的比重比较大,为确保结构在动力作用下不产生大的横向位移或者失稳,有必要进行横向振动分析及控制设计。本文通过对一高桥墩长窄桥梁横向振动参数分析,确定其控制系统最佳质量比,阻尼比,以及刚度。 相似文献
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恽华伟 《中国高新技术企业评价》2014,(14):30-31
作为连铸机核心部件的结晶器振动,现在都采用液压伺服驱动方式,具备设备简单、振动控制精度高及维护量小的优点;能够根据工艺参数的要求在线调整振动波形、振动频率和振幅,使之与浇铸钢种、浇铸速度等匹配,铸坯振痕深度减轻,明显改善了铸坯表面质量。 相似文献
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Daniel Z. Ding Gloria Ge Malcolm Warner 《International Journal of Human Resource Management》2013,24(4-5):836-852
This study reviews the evolution of organizational governance and human resource management practices in China's non-state sector, with a focus on China's township and village enterprises (TVEs). The empirical investigation on twenty TVEs located in Southern China provided the evidence that, as enterprises move towards a more formal corporate governance structure with clearer property rights relations, their human resource management practices tend to become more marketized, in order to meet the challenge of increased competition in the highly dynamic, transitional Chinese economy. 相似文献
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常州火车站是沪宁高铁上的一座最大火车站,也是一座按照最新铁道部旅客站房设计细节要求进行设计的典型中型站房。文章对该站空调系统的设计进行了详细介绍,包括室内温度、湿度、噪声、新风量设计参数的选定、集中空调系统形式的确定(尤其是大空间气流组织的形式,以及按细则要求而采取的送风方式)、夏热冬冷地区冷热源方案的选择,以及为减少站房噪声而采取的消声隔振措施和技术,此外,还对该站的集中空调系统自动控制内容进行了详细的阐述。 相似文献
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采取微振爆破技术施工的浅埋山岭隧道关键问题之一是如何保证整个工程施工的安全与进度,尤其是当浅埋山岭隧道穿越军事设施就对微振爆破施工又提出了更高的要求,如何在控制爆破安全振速的前提下达到理想的爆破效果是隧道施工需要解决的重要课题。结合工程实例,从爆破参数的选取、设计及监测等方面的控制,并不断进行方案优化,最终提出了安全有效的设计方案和施工方法,总结了成功的经验与体会,取得了良好的效果,对类似工程的建设具有一定的参考价值。 相似文献
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《Technovation》2016
Prior research hints at the accelerator as a new generation incubation model. Accelerators have become an umbrella term for any program providing a service structure of mentorship, networking opportunities and access to funding. The challenge, however, is to understand their distinctive characteristics and profiles geared towards reinforcing business start-ups. How do accelerators operate as a new generation incubation model and how do they differ from existing incubation mechanisms? This inductive study investigates 13 accelerators across Europe and adopts a design lens to identify the accelerator model’s key design parameters. We identify five key building blocks and distinguish between three different types of accelerators, taking the primary design theme of the accelerator into account. We contribute to the incubation literature by extending recognition of the heterogeneity of incubation models, by delineating the accelerator as a distinctive incubation model and by introducing the design lens as a useful theoretical framework to investigate incubation models and their evolution. 相似文献
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本文着重从园林工程的方案决策阶段、设计阶段、施工阶段、竣工阶段四个时期阐述了全过程工程造价控制管理对园林工程的影响及意义,结合当前工程造价管理中出现的问题,提出了相关工程造价动态管理的措施。 相似文献
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In recent years there has been an increased awareness regarding the cost of radiologic health care, and the patient delays encountered in the delivery to the consumer. The purpose of this paper is to demonstrate that, at least in one case in the Diagnostic Radiology Department at Temple University, the assumption that better service can be given to patients provided more technicians and orderlies are available, is not valid. The facts tend to indicate that the real problem lies in scheduling techniques, and improved utilization of available equipment. Therefore, it is safe to conclude that for improved radiologic services, the emphasis should be directed towards the design of the management systems and scheduling techniques, and not the staff and/or facilities. 相似文献