登录

双语推荐：径向位置

进入期刊文章
为研究供料口位置对离心机供料射流流场的影响,采用直接模拟蒙特卡罗(DSMC)方法对离心机中心射流区域进行模拟。选择Iguassu离心机模型和变径硬球碰撞模型,得到了不同的轴向和径向供料位置下径向供料模型的供料射流流场参数分布情况。通过对模拟结果进行分析可得:在径向供料条件下,供料口附近区域的流场受供料条件的影响显著。由于供料射流的膨胀作用,导致了供料口附近低温区的出现。在靠近出流边界处,由于较高的角向速度,形成较大的压力梯度,使气体的径向速度降低,导致温度明显升高。轴向位置的变化导致流体参数的轴向平移。而随着供料口径向位置的增大,供料口附近的膨胀范围减小,低温区减弱,即该区域的最低温度升高。而近出流边界处,随供料口径向位置的增大,温度相应降低,径向速度同时降低。
In order to study the influence of feed position on the counter-current in gas centrifuge ,direct simulation Monte-Carlo (DSMC) method was chosen to simulation the rarefied region of gas centrifuge .By setting Iguassu centrifuge model and variable hard sphere (VHS) model ,the flow distributions of different feed positions were acquired . The analysis of the calculation results notes the following flow phenomena :In case of radial feed ,the region near the feed outlet is largely influenced by the feed condition . The expansion of jet results in the hypothermic region .Near the boundary of effluent , due to the fast peripheral velocity ,pressure gradient is large ,w hich results in the slow radial velocity and the high temperature .The axial translation of the jet results in the axial translation of the flow distributions .With the increase of the radius of feed ,the region of expansion near the feed reduces and the lowest temperature of the hypothermic region rises .Near the boundary of

[ 可能符合您检索需要的词汇 ]

进入期刊文章
冻结法施工中内层井壁起到封水和分担地压的双重作用，井壁质量至关重要。通过对红庆梁煤矿内层井壁温度的监测，分析了径向位置及时间对内层井壁温度的影响。分析表明入模72 h 时混凝土浇筑体内各点温度与径向位置呈线性关系。
The inner shaft lining in freezing construction plays the roles of sealing water and sharing ground pressure,so the quality of shaft lining is important? Through monitoring the temperature of inner shaft lining in Hongqingliang Coal Mine,the impact of radial position and time on the temperature is analyzed?The analysis shows that there is linear relationship between the temperature of points in concrete casting body molding after 72 hours and the radial posiG tions.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
分析了径向剃齿刀磨削加工的基本原理,以AutoCAD为开发平台,采用VC++与AutoCAD ObjectARX混合编程语言,建立了径向剃齿刀仿真系统,将径向剃齿刀的各轴运动转化为径向剃齿刀和砂轮的相对位置运动,通过二者之间的相减布尔运算模拟磨削加工过程,并提取径向剃齿刀仿真齿形对其进行误差分析。结果表明该仿真系统能有效提高径向剃齿刀磨削精度。所开发的仿真系统也可用于生成径向剃齿刀的实体模型。
The general machining principle of plunge shaving cutter grinding process was analyzed. Based on AutoCAD development platform and using AutoCAD ObjectARX mixed with VC++programming language, simulation system of plunge shaving cutter grinding was established. By transforming the motion of CNC axes of plunge shaving cutter grinding into the relative position adjustment between the plunge shaving cutter and grinding wheel, the grinding process was simulated by subtraction Boolean operation.Plunge shaving cutter grinding process was simulated and the tooth form error was calculated. The results showed that the method could effectively improve the accuracy of plunge shaving cutter grinding. The development simulation system also can generate the plunge shaving cutter solid model.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
高速印刷状态下,保持良好的套印精度,是衡量印刷机性能的重要标准。针对高速状态下滚筒(或辊子)径向跳动量迅速增大引起的套印精度的问题,从卫星式柔性版印刷机结构及印刷工艺过程入手,分析径向跳动对实际印刷位置的影响,建立径向跳动影响套印精度的分析模型。在此基础上,推导出径向跳动对套印精度的影响因子,直观地反映滚筒(或辊子)尺寸、径向跳动量和套印精度的关系。通过印刷试验和径向跳动测试,验证了径向跳动影响套印精度分析模型。
Under the state of high-speed printing, maintaining a good overprint accuracy is an important performance of the press. For the problem of overprint accuracy caused by the rapidly increasing radial runout of the cylinder ( or roller ) in the high-speed printing state, based on the structure and printing process of satellite-based flexographic press, this paper analyzes the effect of radial runout on the actual print position, an analysis model of overprint accuracy influenced by radial runout is established. By the model, the factor of overprint accuracy caused by radial runout is deduced, which could directly reflect the relationship of the size of cylinder ( or roller) , radial runout and overprint accuracy. The model of overprint accuracy influenced by radial runout is verified by printing experiment and the test of radial runout.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
从角接触球轴承的生产实际出发，分析了影响轴承沟位置尺寸的主要工艺因素，结合设计理论分析了沟位置尺寸偏差对轴承凸出量、装配高、径向游隙、轴向游隙、角度游隙和原始接触角等方面的影响，最后给出了保证轴承沟位置尺寸精度的有效工艺措施。
The main technological factors influencing the groove position dimension of bearings are analyzed from the actual production of angular contact ball bearings.The influences of groove position dimension deviation on protruding quantity,assembly height,radial clearance,axial clearance,angle clearance and original contact angle of bearings are analyzed combining with design theory.Finally,some effective technological measures are given for guaranteeing the groove position dimension accuracy of bearings.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
针对雷达均不能提供目标加速度信息,在目标机动时会出现跟踪精度差甚至跟踪发散的问题,提出一种基于径向加速度的Singer-EKF算法。该算法在信号处理阶段利用Radon-Ambiguity变换(RAT)估计出目标的径向加速度,并通过坐标转换将其引入量测向量中,然后采用基于Singer模型的扩展卡尔曼滤波(EKF)算法实现机动目标的跟踪。仿真验证了该方法的有效性,并与传统的不带径向加速度的扩展卡尔曼滤波(EKF)方法进行了比较,结果表明该方法在径向距离、位置、加速度和速度估计精度方面都有所提高。
The performance of maneuvering tracking can be improved if acceleration is derived. Therefore, a Singer-EKF method based on Radon-Ambiguity transformation (RAT) was proposed for enhancing the tracking of a maneuvering tar-get. In the proposed method, the radial acceleration was derived based on Radon-Ambiguity transformation in signal pro-cessing and then brought into the measurement vector coordinates transform model. In the filtering approach, a method of Extended Kalman Filter (EKF) based on Singer model was adopted to resolve the problem of the non-linearity of the mea-surement equation. The tracking performance of the proposed method is evaluated and compared with the traditional Ex-tended Kalman Filter (EKF) algorithm based on the Singer model without acceleration measurement. It is showned that the proposed algorithm outperformed better in maneuvering scenario, and the estimate accuracies of radial distance, position, acceleration and velocity were improved at the same time.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
光镊是研究单分子生物物理特性的独特工具,因而光镊设备的研发是一个极为重要的课题.本文根据矩阵光学,对基于有限远共轭显微镜的光镊操控光路进行计算,得出了阱位径向操控和轴向操控方程,并分析了光束调控系统、共焦系统后置透镜和耦合透镜安装位置误差及物镜轴向位置调整对光镊阱位径向及轴向操控精度的影响.计算结果显示,当物镜初级像面和耦合透镜像方焦面完全重合,光束调控系统和耦合透镜的距离误差对阱位径向和轴向操控精度没有影响.光镊系统元器件定位不准时,基于无限远共轭显微镜光镊的阱位径向操控误差和轴向操控误差都小于基于有限远共轭显微镜光镊的阱位径向操控误差和轴向操控误差.当光镊耦合透镜定位误差控制在小于10 mm时,基于有限远共轭显微镜光镊的径向和轴向操控误差分别小于5.9%和11.4%,有限远共轭显微镜仍然存在改造为光镊的价值.本文理论为基于有限远共轭显微镜的光镊设计、改造和操控提供理论和实验指导.
@@@@Optical tweezers are unique tools for studying biophysical properties of single molecules. Design and construction of optical tweezers are very important. The optical path, the radial manipulation equation and axial manipulation equation of optical tweezers based on a finite conjugate microscope system are calculated using matrix optics. The influences of axial position adjustment of the objective, the installation location error of the coupling lens, the installation location error of the laser beam control system, and the installation location error of the confocal system lens’ on radial trap position manipulation accuracy and axial trap position manipulation accuracy are analyzed. The results show that axial position adjustment of objective introduces no error in radial and axial trap position manipulation. The misalignment of laser beam control system has no effect on the radial manipulation, nor on axial manipulation when the coupling lens maintains alignment. It is concluded

[ 可能符合您检索需要的词汇 ]

进入期刊文章
为研究核主泵在变流量过渡过程中叶片数与导叶片数对径向力的影响，应用计算流体力学软件CFX对核主泵分别改变叶片数与导叶片数时，叶轮与导叶所承受的径向力变化规律进行数值模拟计算与试验，将数值模拟结果与试验进行验证，试验数据与数值模拟数据在误差控制范围之内。结果表明：变叶片数时，随着流量增大，核主泵叶轮所承受的径向力值随叶片数的增加而增大，在叶片数为7片时达到最大值，叶轮所承受的径向力的周期性趋于规律性；径向力的平衡性趋于最佳工况。随流量变小时，叶轮所承受的径向力位置随旋转周期有规律性地偏移和旋转，其偏移和旋转的变化梯度不同，叶轮所承受的径向力偏移和旋转的变化梯度明显大于向大流量增加时所对应的变化梯度。通过综合对比可知：在变流量过程中，当叶片数为5片、导叶片为11片时，叶轮承受的径向力是最小。
To study the effect of number of blades and guide vanes on a reactor coolant pump’s radial force under variable flow transition conditions,the computational fluid dynamics software CFX was applied in the numerical simulation and test for the radial force variation law with number of blades or guide vanes changed.Compared the numerical simulation results with the experimental ones,both of them were within the error control range.The results showed that with flow rate increasing,the radial force of the reactor coolant pump impeller increases with increase in number of blades,and reaches the maximum value with the blade number of 7,the periodicity of the radial force tends to regularity, the radial force balance tends to the optimum working condition;with flow rate decreasing,the position of the impeller radial force offsets and rotates regularly in its rotating cycle,and the variation gradients of offset and rotation are different;the variation gradients of the impeller radial

[ 可能符合您检索需要的词汇 ]

进入期刊文章
主要研究陶瓷球轴承高精密电主轴动态性能。首先简化并建立轴承—转子系统模型,然后根据电主轴高精度要求选择合适的预紧力,并计算出前后轴承的径向刚度;将所建模型导入软件,根据径向刚度值进行模态分析,结果可以看出所设计电主轴在实际运转中不会产生共振;最后分析出电机转子安装位置变化对临界转速的影响不大,并对比跨距和悬伸量两个模态参数对临界转速的影响,跨距影响最大,悬伸量次之,而安装位置影响最小。该研究为电主轴的设计提供良好的理论依据。
It mainly analyzes the dynamic characteristics for high precision motorized spindle of ceramic ball bearing. Firstly a 3D FEA model of bearing-spindle system is given, then the pretightening force is selected according to high precision and the radial rigidity of shafting bearings is calculated; dynamic analysis is finished in response to the radial rigidity after the FEA model was built in ANSYS, and it suggested that resonance vibration of the motorized spindle can not occur during working;lastly it analyses that the effect of motor rotor position on whirling speed is small. In contrast, the effect of other two modal parameters which are extended length and length of span is bigger and the effect of length of span is the biggest. The research provides good theoretical basis for motorized spindle design.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
提出一种基于摄像机标定方法的无人机视觉导航系统位置解算方法.利用机载相机拍摄目标模板图片序列，通过角点检测方法确定模板上的特征点，并根据特征点位置及摄像机标定技术，解算相机的位置坐标，从而解算出无人机的位置.以VC6.0与OpenCV为实验平台，对该方法进行实例验证.结果表明：该方法在不考虑摄像机透镜的径向畸变与切向畸变的影响时，也可给出理想的位置解算结果.
A localization algorithm based on camera calibration technology for the visual navigation system of unmanned aerial vehicles (UAV)was presented. From the image series of target template taken by aircraft camera, the interesting points were earned by corner detection method. According to these points the algorithm computes the position of camera by the camera calibration technology, then the location of UAV was defined. The experiments was carried out with VC6.0 and OpenCV. The results indicated that an ideal position calculating result can also be given by this method without considering the radial distortion and tangential distortion of camera lens.

[ 可能符合您检索需要的词汇 ]