Following that , the method and step of cold - test simulation with ansys was given . the dispersion characteristic and interaction impedance characteristic curve figures were plotted after the simulation of 文中也将ansys模拟结果与mafia模拟结果进行了对比,验证了ansys模拟的高精度和高效率的特点。
In this dissertation , different theories of measurement are discussed . through the comparison , we use traveling - wave method to measure dispersion and nonresonant perturbation method to measure interaction impedance 通过分析、比较不同的测量方法,本文最后采用行波法测量色散,非谐振微扰法测量耦合阻抗。
Two cold - test parameters determine the working voltage , frequency band , efficiency and gain of twt . they are dispersion and interaction impedance of the slow - wave structures ( sws ) in twt , which are very important targets for twt 行波管慢波结构的色散和耦合阻抗是行波管设计中两个非常重要的冷参量,它们决定了整支管子的工作电压、频带宽度、工作效率和增益。
4 . as an assistant analysis , cst microwave studio is applied to simulate dispersion characteristics and interaction impedance of rectangular groove guide . simulation show better agreement with theoretical results 四、作为一种辅助的分析方法,本文还利用cstmicrowavestudio对曲折矩形槽波导慢波系统的高频特性做了模拟仿真,得到了色散曲线和耦合阻抗,与理论结果符合很好。
Because of the disadvantages such as low automatism , timeworn , the foreign measurement equipments can not meet the demands of measurement on - line . the aim of this dissertation is to develop a measure system of dispersion and interaction impedance , which has high measure precision and automatism 因此,研制出一套高度自动化、具有较高测量精度的冷参量在线测量系统就成为行波管科研生产单位的迫切需求,这也是本论文的工作目标。
At the time of design , the measurement of dispersion and interaction impedance will be used as design verification and improvement . at the time of manufacture , the measurement will find the problems of the slow - wave structures in machining , weld and fitting 在管子研制阶段,对色散和耦合阻抗冷参量的测量可以起到验证、改进设计的作用;在管子生产阶段,通过测量可以及早发现慢波结构在加工、焊接、装配过程中的问题,防止瑕疵品继续流水作业,提高生产效率。
A new terahertz source of folded waveguide traveling - wave - tube which based on vacuum electronics is introduced , which may answer the question for scarcity of small , economical terahertz source with continuous wave of high average power . secondly , transmission characteristics of terahertz wave in the periodic slow wave circuit of folded waveguide traveling - wave - tube have been researched combined with development of micro - fabrication technology . dispersion relation and interaction impedance of the slow wave circuit are deduced by the way of equivalent circuit , and results accounted by theory are close to those simulated by software 其次,结合计算机模拟技术对这种新型太赫兹辐射源的折叠波导慢波线路传输特性进行研究:用等效电路法从理论上推导了慢波电路场、色散关系及线路耦合阻抗,电磁模拟软件计算得出的慢波电路色散曲线与理论计算所得结果基本上一致,表明这种尺寸的慢波电路在太赫兹频段有着色散曲线较平坦以及宽带、低损耗的良好传输特性。
In the domestic factories of twt manufacture , the data of dispersion and interaction impedance are usually obtained by simulation . although the measurement of beam - wave interaction can get the data , which including large and expensive equipments . but it can not find the blemish of sws as early because it must wait until the finishing of whole manufacture 目前,国内行波管生产科研单位基本都是通过软件计算得到慢波结构的色散和耦合阻抗冷参量,或者待整支管子装配完成后,通过热测来估计出慢波结构的色散和耦合阻抗,这样做不但测量不准确,而且也不能及时发现慢波结构的缺陷,浪费了大量人力、财力。
Based on it , a new kind of helix slow - wave structure named elliptical helix slow - wave structure used in helix traveling wave tubes has been detailedly investigated . by studying the rf characteristics of this slow - wave structure , it ’ s found that higher operation frequency and interaction impedance will be obtained by increasing the eccentricity of helix or decreasing it of the shield . meanwhile , great potential of improving system bandwidth has also been found if the eccentricity of helix or shield or the two are properly choosed 本文对近几十年大功率行波管的研究进展进行了简单讨论,并在此基础上研究了一种可应用于螺旋线行波管的新型的螺旋线慢波结构,即椭圆螺旋线慢波结构,通过对该螺旋线高频特性进行详细分析,我们初步认为,选择适当的螺旋线和屏蔽筒离心率,可以提高系统工作频率,增加系统耦合阻抗,并且具有改善系统带宽的潜力。
So the higher output power can be achieved . the analysis of dispersion characteristic and interaction impedance characteristic was shown . then the derivation of boundary condition for dispersion characteristic simulation and the theory derivation of interaction impedance characteristic computed with dispersion characteristic result were all shown 文中介绍了色散特性和耦合阻抗特性的分析方法,给出了色散特性模拟时边界条件的推导和由色散特性结果计算耦合阻抗特性的理论推导过程,并具体给出了用ansys模拟冷测特性的方法和步骤。