图书馆模态升级     

王燕萍 《内蒙古图书馆工作》2003,(4):11-13

图书馆的运行模式和表现形态自20世纪以来有了很大改观，随着网络、信息、数字化的接踵而至，我们也应当看到这场“风暴”对图书馆带来的前所未有的冲击，本就图书馆的网络化、资源协作、公共关系等模式进行了分析。  相似文献   

商用车驾驶室声腔声学模态试验与计算模态分析   总被引：1，自引：0，他引：1  

曾祥坤  喻菲菲 《广东技术师范学院学报》2015,(2):26-30

阐述了声学模态有限元法的基本原理与声学模态的求解方法;以某商用车驾驶室内声腔为研究对象,介绍了声腔有限元简化模型的建模方法,以及多参考最小二乘复频域模态参数识别(Poly Max)方法的原理;论述了驾驶室内声腔声学模态试验的方法和步骤.结果显示,与试验模态频率相比,计算模态频率的误差率在6%以内,试验与计算的模态振型基本一致.这表明文中驾驶室声腔有限元简化模型的建模方法是准确的.  相似文献   

车载双联液化气气瓶框架优化设计     

《滨州学院学报》2020,(6):63-68

对车载双联液化气气瓶框架结构进行轻量化设计。依据模态分析理论,构建有限元分析模型,对笼式焊接框架和轻量化设计框架进行模态分析比较,轻量化框架模态频率分布优于笼式焊接框架。按垂向冲击、紧急制动冲击和转弯冲击三种典型强度冲击工况对框架进行强度分析,工况强度均小于材料许应强度,符合强度安全设计要求。装车30 000km综合路面测试,产品没有发现损坏或外观缺陷。轻量化气瓶框架在保障结构安全及设计性能指标的基础上,可实现批量化生产。  相似文献   

＂Turkish Five＂：Their Contributions to Contemporary Piano Music and Piano Education in Turkey     

Sirin Akbulut 《美中教育评论》2011,(3):354-369

First musicians using polyphony and homophony in their compositions can be seen during the 19th century in Turkey. These talented amateur composers, who worked in simple forms, such as marches or educational music, were not actually professional composers but either orchestral or choral directors. Later, during the Republic period （after 1923）, ＂Turkish Five＂ emerged. ＂Turkish Five＂ consisted of professional composers who were educated in Europe and learned western musical forms. These musicians, according to their birth years, are Cemal Resit Rey （1904-1985）, Hasan Ferit Alnar （1906-1978）, Ulvi Cemal Erkin （1906-1972）, Ahmet Adnan Saygun （1907-1991） and Necil Kazan Akses （1908-1999）. ＂Turkish Five＂ achieved important accomplishments and did significant contributions to Turkish contemporary music in 30-40 years with their efforts. While doing this, they used over 500-year old musical legacy of the West. At the beginning, these musicians used Turkish folk tunes and their rhythmic and modal system, however, later, they began to use ＂impressionism＂, ＂neo-classicism＂ and finally ＂atonalism＂ in their music. In the current study, the contributions of ＂Turkish Five＂ to contemporary Turkish piano music and their approaches to piano education were examined via literature review. After an extensive research with the literature on the topic, the researcher has interviewed with six piano teachers from different music institutions in Turkey （including two schools of time arts, two conservatories and two music teacher training schools）. During these interviews, the contributions of the ＂Turkish Five＂ were examined based on ＂relativity＂ and ＂local to global＂ principles in education, and the researcher has searched for the ways to use more of their music in piano education through the interviews. Therefore, the main purpose of the study was to discover ways to implement more of the music by ＂Turkish Five＂ in piano education in Turkey and to ffmd solutions fo  相似文献   

电力系统多模态低碳电力调度策略分析     

《实验室研究与探索》2020,(7):53-57

电力调度优化是一项长期的工程和课题,需要随着电力系统的发展而变化,而且在不同的时刻和状况下会具有不同的调度模型和优化方案。随着环境污染问题的不断加剧,低碳电力越来越重要,因而发电设备需要配置碳捕集设备进行低碳运行,从而满足相关的标准。为了更有效地进行后续的低碳调度分析,对碳捕集技术的相关理论进行了分析和说明,针对碳捕集设备对于发电厂电价的影响,建立了低碳调度的相应模型,得到正常模态和附加模态下的系统约束条件,构建相应的低碳调度运行策略。并在IEEE30节点系统中对其进行验证分析,得到了正常模态和附加模态下的低碳电力调度策略的有效性。  相似文献   

思辨能力的培养与多模态外语教学设计     

陈知武 《北京城市学院学报》2019,(1):44-47,57

CHEN Zhiwu(City Institute,Dalian University of Technology,Dalian,Liaoning 116600,China)  相似文献   

微型汽车变速器箱体有限元模态分析     

李涛  张均富 《高等教育研究(成都)》2007,23(3):95-97

变速器是汽车传动系统的主要部件之一,它的振动必然带来汽车整车的振动和噪音,影响汽车的整车性能,特别是轿车的乘坐舒适性。本文以奥托汽车变速器为研究对象,基于Solid Works建立奥托汽车变速器的三维实体模型,并利用COSMOS Works建立箱体的有限元模型,完成了该汽车变速器箱体的模态分析。分析结果可为为箱体的结构设计提供依据。  相似文献   

模态试验分析在教学中的应用和实践     

赫雷  王进  管红根  周克栋 《实验技术与管理》2011,28(5)

模态试验分析是了解结构动态特性的有效手段.通过模态试验,可以计算出结构的固有频率、模态振型、阻尼比等参数,为结构设计与优化打下坚实的基础.在实验教学中,通过对模态试验的基本原理、主要步骤和试验中注意事项的介绍和分析,可以指导学生完成模态实验,加深学生对理论知识的理解和掌握,提高学生的动手能力、独立思考能力和分析解决问题的能力.  相似文献   

WPT-based modal control on distributed structures with MRF-04K damper     

林伟  李忠献  张根明  黄鹏云 《天津大学学报(英文版)》2011,17(6):397-403

The magnetorheological (MR) fluid damper-based semiactive control systems have received considerable attention for protecting structures against natural hazards such as strong earthquakes and high winds. In this paper, a novel modal controller using wavelet packet transform (WPT) is proposed for the vibration control of distributed structures. In the proposed control system, the WPT method is utilized to decompose the acceleration measurement and select the modes containing most of the WPT energy component as the dominant modes. Then, a modal controller is designed to control the dominant modes and the optimal active control force is solved. Finally, Clipped-optimal con- trol law is adopted to determine the voltage applied to each MR damper. A Kalman-filter observer, which estimates the full controlled modal states from local accelerometer feedbacks, is designed for rendering the controller to be more applicable to distributed structures with a large number of degrees of freedom. A numerical example of a stadium roof structure installed with MRF-04K damper is presented. The effectiveness of the controller is evaluated under both Tianjin and El Centro earthquake excitations. The superior performance and adaptability of the controller for versatile loading conditions are demonstrated through the comparison with traditional truncated modal controller.  相似文献   

汽车盘式制动器制动噪声的分析与研究     

《滨州学院学报》2019,(6):76-81

以某轻型汽车为研究对象,根据制动时的受力情况,建立盘式制动器三维模型,使用SYSNOISE求解器对不同制动初速度下的噪声强度进行分析。在确定合适的边界条件和自由度后,完成临界条件下制动盘、制动片和制动支架的模态分析。通过结果对比,总结不同频率下形变量的变化规律,并针对由共振引起的噪声问题提出初步解决方案。  相似文献