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1.
ITER聚变装置重力支撑有限元模态分析   总被引:1,自引:1,他引:0  
运用有限元分析软件ANSYS建立了ITER装置重力支撑结构环向20°的三维有限元模型,采用子空间法对ITER重力支撑结构系统进行了有限元模态分析,求出了重力支撑系统的前10阶固有频率和振型,并对振型特点进行了分析。  相似文献   

2.
用ANSYS有限元软件建立了ITER重力支撑系统(20度最小旋转周期)3维有限元分析模型,采用分块(Block Lanczos)法对ITER重力支撑系统进行有限元模态分析。计算分析,ITER重力支撑系统的前10阶固有频率和振型。模态分析结果表明ITER再力支撑结构的韧性板刚度对模态影响较大。  相似文献   

3.
ITER聚变装置重力支撑静应力数值模拟   总被引:1,自引:1,他引:0  
应用ANSYS软件对ITER聚变装置重力支撑结构进行了静应力有限元分析,模拟了重力支撑在工作过程中多种工况的应力变化情况.静应力计算结果表明,支撑结构各部件的应力低于材料的许用应力极限,因此支撑结构,尤其是21块韧性板部件能在各种工况下安全运行.  相似文献   

4.
用ANSYS有限元软件,分析了ITER重力支撑系统的静力情况。采用实体单元建立有限元模型,分析了磁体重量、热载荷、地震和电磁力多种工况下的应力分布及位移变形,获得的最大应力强度和最大位移均在许用应力及允许位移范围内。为进一步优化ITER重力支撑系统提供了重要的参考数据。  相似文献   

5.
阐述了ITER极向场磁体系统超导母线的结构及支撑设计,用有限元分析法对结构进行了分析。获得了母线所受电磁力,据此初步设计了母线的支撑,通过ANSYS分析优化并最终确定了支撑布置位置。  相似文献   

6.
提出了深孔钻直冷方案用于优化 ITER 极向场 PF6 磁体支撑冷却系统设计。采用有限元分析方法, 从换热效率、流体压降、结构强度等方面对流道数量和孔径进行了最优化设计。结果表明,9 条直径 10mm 的冷 却流道可以达到最佳的冷却效果。同时,在服役环境下支撑部件的机械强度和温度分布、流体的运行参数均能满 足 ITER 磁体支撑的设计要求。目前所有 PF6 磁体支撑已完成了制造和检验,并顺利交付 ITER 组织。   相似文献   

7.
用ANSYS软件对ITER聚变功率关闭系统(FPSS)的一种阀门箱的结构在ITER各种典型荷载组合下的应力和应变进行了有限元分析,并遵照ASME及ITER标准对分析结果进行了评判。结果表明这种阀门箱结构能够满足ITER的设计要求。  相似文献   

8.
一种小型空间反射镜支撑结构的设计与分析   总被引:1,自引:0,他引:1  
王忠善  何欣  付亮亮 《光学技术》2011,37(6):686-690
为了确保成像质量,空间光学遥感器反射镜既要满足在重力和温度耦合的复杂工况下面形误差的要求,同时还应具有良好的动态特性.设计了一种圆形小型反射镜,并类比反射镜径向挠性安装原理设计其柔性支撑结构.采用CAE有限元分析软件对该反射镜的柔性支撑结构的参数进行了优化,最终确定了一种合理的柔性支撑结构.经过分析计算,该柔性支撑结构...  相似文献   

9.
根据ITER装置对CTB盒技术性能的要求,对CTB盒中冷屏的支撑部件进行了结构和传热的分析和设计。对结构形式的选择、结构强度的理论计算和支撑结构总的热损失进行了设计和计算,用ANSYS软件对该结构的非线性接触结构-热耦合问题进行了仿真分析。研究结果表明,球支撑结构既能够满足系统对支撑的结构安全要求,在有压接触情况下的漏热量符合ITER设计文集的规定。  相似文献   

10.
利用有限元仿真软件ANSYS Workbench,结合反应谱法对ITER极向场变流器外旁通设备进行了地震分析。具体分析了在ITER提供的设计地震频谱下,外旁通结构所受的最大等效应力、方向位移以及固定支撑位置的反作用力。分析结果表明,外旁通最大等效应力不超过8.3MPa,最大方向位移不超过2.6mm。以上数据表明,外旁通结构能够满足抗震要求。  相似文献   

11.
用解析法分析了螺栓的受力情况,计算出了螺栓的预紧力,设计了各种螺栓的参数,介绍了变更设计中用超级螺栓来防松的问题,提出了用全尺寸的螺栓模型和支撑结构的装配模型进行实际工程测试研究来增加设计的可靠性,为ITER纵场磁体支撑的螺栓结构设计提供了工程参考。  相似文献   

12.
根据ITER运行的主要危险工况,设计了一个专用的三维加载测试平台,并对该测试平台进行了结构有限元分析。有限元分析结果表明,三维测试平台结构有足够的强度和刚度,能满足磁体支撑原型件的三维加载测试的精度要求,可以用该设计方案进行制造。为了确信三维加载测试的可靠,制定了专门的三维加载测试平台的验收方案并按此方案对测试平台进行了可靠性测试。  相似文献   

13.
虞益挺  苑伟政  乔大勇  梁庆 《物理学报》2007,56(10):5691-5697
提出了一种利用临界屈曲法在线测量微机械薄膜残余应力的新结构,并采用表面微加工技术制作了两种测试样品.搭建了在线观测实验装置来实时监控释放过程中结构出现的临界屈曲变形模态,由此判断出结构内部的应力状态,同时在测得临界刻蚀深度的情况下,采用有限元方法计算出残余应力大小.借助有限元方法,先研究了多个参数对临界屈曲应力的影响,然后利用这种新结构对薄膜残余应力进行了实际测量,所得结果与微旋转结构的应力测量结果基本吻合.分析及实验表明,新结构在测量薄膜残余应力方面有许多优点,具有较高的实用价值,不仅能满足大量程的应力检测要求,而且只用一个结构就可以同时测量压应力和拉应力,从而极大提高了器件版图空间的利用率.  相似文献   

14.
In this paper, we examined the buckling of perfect and defective armchair boron nitride nanotubes with three types of vacancy defects, i.e. B- and N- single vacancy defects and B–N- double vacancy defect, using molecular dynamics simulations. To this end, all systems were modeled with a Tersoff-type potential, which is able to accurately describe covalent bonding of BN systems. We applied external uniaxial compressive forces to the nanotubes in vacuum and derived the critical buckling loads and strains, at room temperature in an NVT-ensemble. Our results showed significant differences between the critical buckling strengths of pristine and defective nanotubes. The resistance to axial buckling decreased with the introduction of one vacancy defect, and the B–N- double vacancy was the most seriously damaged structure, followed by B-vacancy and N-vacancy defects. Furthermore, the B-vacancy was shown to have the most significant effect on the decrease of the critical buckling strain. This can be attributed to the excessive asymmetries and perturbations induced in the structure of the nanotube and the local deformations around the defective site around the B-vacancy, even before loading. Moreover, results show that reduction in the buckling strength of the nanotube due to the presence of more than one B-vacancy defect depends on their distribution. If the two or three defects are close to each other, they act as a single point of weakness and the critical buckling load is only slightly reduced (similar to the existence of only one vacancy defect). However, if the defects are at more distant points, the critical buckling load may experience a higher decrease. Results show that vacancy defects play a critical role in the compressive buckling performance of boron nitride nanotubes and special attention must be paid to the presence of structural defects when designing members against buckling, especially for micro- and nano-electro-mechanical systems. On the other hand, defect engineering is a great means for tailoring the buckling strength of boron nitride nanotubes, in cases where the nanotube is expected to absorb energy through compressive buckling deformation and is not designed against, but for buckling.  相似文献   

15.
姚小虎  韩强  辛浩 《物理学报》2008,57(1):329-338
单壁碳纳米管的力学行为是纳米复合材料和纳米器械的基本问题之一.使用有限元方法系统地研究了单壁碳纳米管的轴压和纯弯变形,并将有限元模拟结果和分子动力学模拟结果进行了比较.研究结果表明单壁碳纳米管的轴压屈曲载荷受直径变化的影响;单壁碳纳米管在弯曲载荷作用下的屈曲和后屈曲行为强烈地依赖于管长和管径的变化,合理地选择碳纳米管的弹性模量和壁厚,有限元方法能够很好地解释碳纳米管的屈曲机理.研究大尺度的纳米力学问题时,有限元方法将会成为更加准确、快捷的数值模拟方法. 关键词: 单壁碳纳米管 非线性力学行为 有限元  相似文献   

16.
姚小虎  韩强  辛浩 《中国物理 B》2008,17(1):329-338
单壁碳纳米管的力学行为是纳米复合材料和纳米器械的基本问题之一.使用有限元方法系统地研究了单壁碳纳米管的轴压和纯弯变形,并将有限元模拟结果和分子动力学模拟结果进行了比较.研究结果表明单壁碳纳米管的轴压屈曲载荷受直径变化的影响;单壁碳纳米管在弯曲载荷作用下的屈曲和后屈曲行为强烈地依赖于管长和管径的变化,合理地选择碳纳米管的弹性模量和壁厚,有限元方法能够很好地解释碳纳米管的屈曲机理.研究大尺度的纳米力学问题时,有限元方法将会成为更加准确、快捷的数值模拟方法.  相似文献   

17.
A new class of solitonlike solutions is derived for the Grad-Shafranov (GS) equations. A mathematical analogy between the GS equation for MHD equilibria and the cubic Schr?dinger equation for nonlinear wave propagation forms the basis to derive the new class of solutions. The solitonlike solutions are considered for their possible relevance to astrophysics and solar physics problems. We discuss how a solitonlike solution can be generated by a repetitive process of magnetic arcade stretching and plasmoid formation induced by the differential rotation of the solar photosphere or of an accretion disk.  相似文献   

18.
Grassi G 《中国物理 B》2012,21(5):50505-050505
This paper presents a new scheme to achieve generalized synchronization(GS) between different discrete-time chaotic(hyperchaotic) systems.The approach is based on a theorem,which assures that GS is achieved when a structural condition on the considered class of response systems is satisfied.The method presents some useful features:it enables exact GS to be achieved in finite time(i.e.,dead-beat synchronization);it is rigorous,systematic,and straightforward in checking GS;it can be applied to a wide class of chaotic maps.Some examples of GS,including the Grassi-Miller map and a recently introduced minimal 2-D quadratic map,are illustrated.  相似文献   

19.
The diffractive optical element (DOE) is widely used to generate various illumination modes in the projection lithography system. The working principle and design methods of the DOE are discussed in detail in this paper. A mixed multi-region design method is proposed to calculate the phase of DOE based on the poor spatial coherence of excimer laser, using the Gerchberg–Saxton (GS) algorithm. The DOEs generating circular, dipole and quadrupole illumination modes are designed and simulated by three different methods: single region design, repeated multi-region design and mixed multi-region design. The performance of these DOEs are compared and analyzed with these three design methods. The mixed multi-region design method is used to design the DOEs generating three illumination modes, the diffraction efficiencies are greater than 85%, and the non-uniformities of illumination are less than 3%. The analysis results indicate that the DOE designed by the mixed multi-region design can achieve higher diffraction efficiency and illumination uniformity of the far-field intensity distribution without modifying the GS algorithm.  相似文献   

20.
A wavelength tunable thermo-optic filter has been designed and fabricated for 1550 nm transmission. It has a Fabry--Perot resonator at the center with two sets of distributed Bragg reflector mirrors at both ends. The filter is fabricated as a free-standing membrane of alternating poly-Si and SiO2 films surrounded by a thick silicon frame. The membrane is buckled due to the residual stress. Because of the buckling effect, high tuning efficiency of more than 0.17 nm/°C is observed. When the filter has a buckled surface, the incident light normal to the filter should have a range of non-zero angle of incidence to the membrane, which is dependent on the degree of buckling that depends again on the temperature. The transmittance calculations which integrate each incoming ray from a different incident angle show good qualitative agreement with the temperature dependence of the center wavelength and bandwidth.  相似文献   

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