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1.
分析了联组窄V带传动性能试验台带轮偏斜角的影响因素,利用Solidworks simulation对初步设计的试验台轴系进行有限元分析,并通过优化设计参数使轴系弯曲变形降低了80%,确保了轴系设计的可靠性,为进一步研究摩擦与啮合复合传动带传动性能试验台奠定了基础。  相似文献   

2.
研制了模拟汽轮发电机组机电动态过程的扭振试验台;介绍了模拟引进型300MW汽轮机组轴系试验台的模拟方法和设计原则;利用试验台进行了机电动态试验;对轴系扭振进行了测试.试验表明,该试验台可用于验证机电动态仿真程序及研究扭振机理.  相似文献   

3.
轴系扭振试验台的研制   总被引:5,自引:1,他引:5  
研制了模拟汽轮发电机组机电动态过程的扭振试验台,介绍了模拟引进型300MW汽轮机组轴系试验台的模拟方法和设计原则;利用试验台进行了机电动态试验;对轴系扭振进行了测试,试验表明,该试验台可用于验证机电动态仿真程序及研究扭振机理。  相似文献   

4.
为分析船舶尾轴与艉部结构的异常振动现象,研制了船舶尾轴振动试验台以对船舶轴系进行仿真模拟。为了使其接近实船艉部结构工况条件,使用与传统方法不同的弹性支撑试验台结构,建立基于尾轴-油膜-艉部结构的研究范畴,进而采用周期性激励力激励尾轴进行了各种试验,对产生尾轴振动的原因进行了分析,并结合振动传递的数值模拟进行佐证。结果表明:各频率激励力对尾轴振动试验台的影响不同,当干扰频率与其结构固振频率接近时,激励力对尾轴振动产生的影响最大。  相似文献   

5.
根据弹性体系的振动理论,针对轴系偏心引起的抛料机不能正常运行的问题进行了研究.以离心力对轴系的动载荷所引起轴的挠度为出发点,对轴的弯曲变形、轴系的弹性系数、轴系自振频率等进行了理论分析和计算,确定了轴系设计的各主要参数,并进行了轴系的强度校核,解决了轴系偏心问题,确保了抛料机的正常工作.  相似文献   

6.
针对电动轮自卸车发动机和发电机系统轴系扭转振动问题进行分析,并通过试验进行验证,提出分析此类轴系扭转振动的研究方法。根据电动轮自卸车的动力传递系统由发动机和发电机直接刚性连接而成的特点,对系统轴系进行固有振动特性和强迫振动特性分析时,建立轴系扭转振动分析的集总质量参数模型,利用系统矩阵法和能量法获得轴系的固有频率和振型。在试验验证阶段,采用非接触式扭转振动测量法进行试验验证,对比分析计算结果和试验验证结果。研究结果表明:分析计算和试验验证基本吻合,证明了针对此类轴系扭转振动分析计算方法的可靠性,并获得轴系扭转振动发生共振的主谐次和强谐次,为进一步进行扭转振动减振分析及部件设计提供了依据。  相似文献   

7.
固体火箭发动机高速旋转试验台设计   总被引:1,自引:0,他引:1  
结合现有试验台的改造和重新设计,从方案设计、动力源选择、轴系部件设计、传感器选用与安装等角度,分析了在高速旋转试验台设计中应考虑的主要问题.提出了新的改进设计方案,实践检验是完全可行的,该设计方案实现了高速旋转条件下固体火箭发动机推力、压力的同时测量,解决了密封问题,试验过程中的振动和噪声减小,并且试验台的运行和维护性能也得到提高.  相似文献   

8.
为了减小船舶轴系弯曲振动所引起的轴系疲劳破坏,提出一种并联安装在推进轴系上的动力吸振器。首先采取解析方法对轴系弯振的固有频率和模态进行分析,其次运用模态综合法建立了安装动力吸振器的船舶轴系的动力学模型,求解出船舶轴系弯曲振动的运动响应放大系数,并讨论了设计参数对主振系统的振动影响特性。该研究可为动力吸振器的结构设计提供参考。  相似文献   

9.
对轴系校中的有限元法进行研究 ,特别是对轴系校中计算中的刚度、多支承和弯矩负荷影响数等问题进行了全面深入的探讨 ,并开发了轴系校中计算软件 ,通过实例计算与三弯矩法和传递矩阵法进行比较 ,以证明有限元法的有效性和精确性 ,从而进一步完善了船舶轴系校中理论和方法  相似文献   

10.
介绍了电磁阀试验台流体系统的结构,分析了诱发流体脉动产生的机理和流体脉动对电磁阀试验台正常工作及运行的危害性,并说明了研究和采用一定工程措施消减流体脉动的必要性.在电磁阀试验台流体系统中使用了蓄能器组作为消减流体脉动元件,介绍了蓄能器的结构和工作原理,进行了加装蓄能器的流体系统压力对泵源流量脉动的幅频特性并对其进行动特性的仿真研究,进而合理地选择蓄能器组的相关工作参数使其达到最佳消减电磁阀试验台流体脉动的效果.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

14.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

15.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

16.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

17.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

18.
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the  相似文献   

19.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

20.
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