On the foundation of combining finite elements with groove control theory , the computational method , which is used for natural frenquency of bearing - axle system at ultrahigh speed , is provided , and it is discussed how the pre - load and rotor speed affect the natural frenquency 在综合有限元法和滚道控制理论的基础上，给出了角接触球轴承轴系统在超高速工况下运转时各阶临界转速的计算方法，并讨论了预紧力和转速对轴系临界转速的影响。
This paper proves that the changes of pre - compression on the windings have effects on their natural frequencies and derives their relation , which provides the experimental and theories foundation for fault diagnosis of large - scale electric transformers 通过对大型变压器绕组进行振动实验和根据建立的变压器绕组轴向振动数学模型的理论推导，阐明了变压器绕组预紧力的变化与其固有频率变化之间的关系，这为大型变压器的故障诊断提供了理论与实践依据。
Combines with a concrete subject , this paper , composed of seven chapers , makes a deep analysis on theory and experiment of key bolt fastening of engine . the first chapter presents the theory of tightening technology of the available bolt the second chapter gives a narrating about tighten technology availably in survey . pointing that the nature of torque control is axis preload 本文结合一具体课题，第一章叙述了可控螺栓拧紧技术的理论，第二章综述了可控拧紧技术，提出了扭矩控制研究的实质是控制螺栓的轴向预紧力。
With prestressed rolling mill of the middle steelworks of taiyuan iron and steel limited group company as the researched object , this article analyze the existent questions and research the initial stress of prestressed rolling mill and computer control system , analyze the design thought of prestressed rolling mill and clarify the relationship between the dimensional precision of rolled material and the rigidity of base of rolling mill and the main method to increase the rigidity of base of rolling mill , analyze how to confirm the rigidity , sectional area of handle and post , and pretightening force , put forward the viewpoint that the key to assure great rigidity is to assure that the remnant initial stress is always positive during rolling , and develop intelligent control system with plc as the core on the basis of the former research to assure that the remnant initial stress is always positive during rolling 本文以太钢集团公司中型型钢厂预应力轧机为对象，分析了该厂预应力轧机所存在的问题，对预应力轧机的预应力以及微机控制进行了系统研究；分析了预应力轧机的设计思路，阐明了轧材尺寸精度与轧机机座刚度的关系及提高轧机机座刚度的主要途径；分析了预应力轧机设计过程中预应力轧机的刚度、预紧拉杆和机架立柱断面积及预紧力的确定；提出了预应力轧机保证高刚度的关键就是“确保轧制过程中，残余预应力始终大于零”的观点；在前述研究的基础上开发了以可编程逻辑控制器为核心的智能监控系统，以确保“轧制过程中，残余预应力始终大于零”这个要求。
In view of the high demand on the coaxial tolerance of linear induction accelerator in centering assembling and considering the interaction among flange , bolts and gasket , finite element analysis was adopted and a 3 - d finite element model of accelerator in centering assembling with bolted - flange connection was built 摘要针对直线感应加速器对中装配同轴度要求高的特点，考虑法兰、螺栓和密封垫相互作用，建立了加速器对中装配法兰螺栓联接的三维有限元模型，分析了螺栓预紧力对加速器对中装配时同轴度的影响作用。
Through simulating model tests of shield tunnel passing through the yellew river in the diversion project from south to north china , a systematic analysis on the primary factors affecting joint stiffness , including arrangement of joint bolt , thickness of annular packing of bolt , behavior and thickness of cushion material between two tube plates , magnitude of prestressing force of joint bolt and different stressed states at tube plate joint etc . , are performed . the study results may provide reference for tube plate design of shield tunnel 通过南水北调穿黄盾构隧道仿真模型试验,对影响接头刚度的主要因素即连接螺栓的布置、螺栓垫圈的厚度、管片与管片之间垫层材料的性能和厚度、连接螺栓的预紧力的大小及管片接头不同的受力状态进行了系统的分析,为盾构隧道管片设计提供了参考。
Based on the ansys finite element method software , structure of the new type elliptical cam is researched , effect of the flexible - hinged structure ’ s cross - sectional thickness and the magnitude of pre - tightening force to the performance of elliptical cam is analyzed , using the analysis result , flexible - hinge structure of the elliptical cam is designed in reason 用ansys软件对新型椭圆凸轮进行了结构有限元分析,分析了柔性铰链最小截面厚度和预紧力的大小对椭圆凸轮性能的影响,根据有限元分析结果,合理设计了椭圆凸轮的柔性铰链结构。
Using the optimum calculating method , some important technical parameters could be determined , that is , optimum supporting force , allowable deformation of rock mass , cross section area of u - shape set , pre - tight force and diameter of the bolt as well as torque to provide optimum supporting force 用这一计算方法能求出岩石恒阻支护的重要技术参数，即最优（小）恒阻支护力、围岩最大允许变形量、恒阻u型钢支架的截面积、联接螺栓的预紧力和直径及最优支护力的拧紧力矩。
The cross short rollers guide way and servo feed - system are the most important parts of 3mz204cnc bearing internal grinding machine made by luoyany bearing research institute . - we have analysised firstly the factor of influence with roller guide way rigid , and we have obtained a load - distortion curve . we also have analysised the dominating factors influence with distinguish ratio of guide way , and we have obtained a solution about pre - tighted load which were tested by experiments 本文对洛阳轴承研究所研制的3mz204cnc全自动内圆磨床的核心部件：十字交叉滚子导轨和数控进给系统展开研究，首先对影响滚动导轨刚度的因素进行分析，得出载荷?变形曲线，对影响导轨分辨率的各因素进行分析，得出预紧力大小与分布对分辨率和起动力的影响，并通过实验验证。
Abstract : through simulating model tests of shield tunnel passing through the yellew river in the diversion project from south to north china , a systematic analysis on the primary factors affecting joint stiffness , including arrangement of joint bolt , thickness of annular packing of bolt , behavior and thickness of cushion material between two tube plates , magnitude of prestressing force of joint bolt and different stressed states at tube plate joint etc . , are performed . the study results may provide reference for tube plate design of shield tunnel 文摘:通过南水北调穿黄盾构隧道仿真模型试验,对影响接头刚度的主要因素即连接螺栓的布置、螺栓垫圈的厚度、管片与管片之间垫层材料的性能和厚度、连接螺栓的预紧力的大小及管片接头不同的受力状态进行了系统的分析,为盾构隧道管片设计提供了参考。
