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文章介绍了一种新型的高精度、低成本的流量传感器,分析了流量测量的原理。重点阐述了恒温工作方式下热线式传感器的数学模型和设计方法。设计中根据热平衡原理,通过热量的传递转移来确定流体的速度,通过数据融合算法,实现传感器的温度补偿和线性补偿,以获得较高的精度和温度稳定性。实践表明,该设计方法具有较高的准确性和应用推广价值。 相似文献
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实物测量造型中的测量数据重定位方法 总被引:18,自引:0,他引:18
根据几何图形的坐标变换原理,提出了一种工于基准点的数据转换对齐方法,通过重复测量三个基准点,求出坐标旋转变换和平移变换短阵,在误差分布不均匀的情况下,可采用最小二乘法计算点的最佳重合值,最后将此方法应用于摩托车外形塑件的测量造型中,用以检验转换精度,得到的产品造型准确,配合轮廓事,达到了设计要求。 相似文献
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介绍了如何将三次参数样条插值法运用到铁路隧道断面轮廓曲线拟合的过程,及如何计算出轮廓曲线的数学表达式,并利用所求方程,对隧道断面面积进行计算,实现了其与标准隧道断面的比较,计算出了实际断面的超、欠挖面积和体积。在算法基础上,设计开发出一个应用系统———计算机辅助隧道断面测量系统,通过实验验证了该方法的正确性。这一方法的应用,将断面量测与洞室位移监测相结合,实现了隧道断面测量的数字化,改进了传统隧道断面的验收工作,降低了其外业难度,提高了测量精度。 相似文献
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针对结构光形位公差视觉测量系统,提出了一阶径向畸变的摄像机成像模型和标定方法,并对传统的直接线性变换(DLT变换)标定算法做了些改进。即先针对没有畸变的线性模型,利用传统的标定算法,解线性超定方程组求解摄像机的全部参数,再针对引入一阶径向畸变的成像模型,以线性模型的参数为初值,通过非线性迭代优化摄像机的图像中心,等效焦距,倾斜因子,畸变系数等内部参数。实验结果表明,该方法无需预标定,精度适中,是相对简单实用的标定方法。 相似文献
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论文提出了多个非线性软测量模型通过集成为一个模型来提高精确性和稳定性的思想。通过分析被控温度的影响因素,选取了影响温度并且容易在线测量的辅助变量,建立相应的模型,然后用回归建模的方法把建立的模型集成为一个模型,这样可以提高整个软测量的精度、稳定性和实时性等性能,通过实例分析和实际运行效果验证了这种方法的可行性和有效性。 相似文献
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提出了一种利用IGS数据进行GNSS测量值仿真方法,分析了GNSS的误差模型、仿真流程及数据处理方法;利用Matlab软件仿真实现GNSS观测环境中的各项误差及接收机测量值,并与Sprient模拟器进行同步仿真,通过比较两者数据验证了接收机数据仿真的正确性和精确性,证明了利用该方法进行测量值仿真的有效性及误差模型之间的差异性,满足不同人员对GNSS仿真观测值的需要,为GNSS接收机观测值仿真和软件模拟器模型选用提供参考。 相似文献
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为提高超声波流量计的测量精度,通过对不同信号处理方法的探讨,用基于时差法超声波流量计关键技术之一的回波信号处理方法,在双阈值法基础上提出了跟踪回波幅值的增益控制法,以确定回波中特征波的位置、修正超声波传播时间的偏差。相比于传统超声波回波信号处理方法,该方法具有算法简单、实时性强、参考目标明确等特点。描述了时差法流量计的测量原理以及影响因素。分析了超声波的幅值特性。介绍了跟踪回波幅值的增益控制法的电路基本组成和软件流程。解决了复杂工况条件下测量稳定性差的问题。通过流量标定试验和数据比较,证明所提方法的测量结果优于采用双阈值法的测量结果,并且流量计测量精度和稳定性得到提高。 相似文献
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A robot must manipulate objects with high accuracy and repeatability to perform precise tasks. However, deviation in performance is attributed to uncertainties and improper selection of control, noise, and process factors. The information regarding the effect of these factors on performance is almost non-existent. A probabilistic approach has been used to model and simulate the performance of manipulator. The combined array fractional factorial design of experiment approach has been employed to identify the significant factors and their interactions. This approach helps in screening of the manipulator factors and focus on those that are important. To explore further, two indices, viz. link length ratio and link mass ratio, have been proposed and impact of these indices on manipulator performance is investigated. A two degree of freedom (2-DOF) RR planar manipulator performing a task with cubic and quintic trajectory has been used to illustrate the approach. It has been observed that the statistically significant factors are different for different tasks in workspace. It has also been observed that for the same task, factors responsible for performance variations are different for cubic and quintic trajectories. Finally, it has been demonstrated that the link length ratio change has significant influence on performance compared to link mass ratio. 相似文献
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The axial corner flow problem has been studied using an ADI method. An optimization study of the method has been carried out in order to maximise the solution convergence rate while maintaining is stability and accuracy. The results obtained by the present method are in good agreement with the available results due to the Gauss-Seidel explicit method.The influence of symmetry boundary on the solution convergence rate has been studied and the approximate manner of specifying this boundary condition for numerical computation has been established. The boundary condition on the vorticity function at the wall has been analysed, and the advantages of the implicit treatment of this boundary condition over explicit treatment are presented. The supriority of the ADI method over the Gauss-seidel explicit method is clearly demonstrated. 相似文献
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ISG混合动力城市客车性能仿真研究 总被引:2,自引:0,他引:2
该文简述了国内外混合动力汽车系统结构,重点分析了ISG混合动力城市客车的结构及优缺点。基于Matlab/Simulink,建立了柴油机模型、电机模型、离合器模型以及整车模型。以优化车辆动力性和经济性为目标,提出了针对ISG混合动力城市客车的能量分配控制策略。以不同功率的发动机与不同功率ISG电机的配比,寻求最优的混合比,从而得出一个最佳的功率匹配,以获得最优的经济性和动力性能。仿真结果表明,按照该混合比的混合动力系统能显著提高车辆的动力性和经济性,为零部件的选型提供了理论依据。 相似文献
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针对组装式石英谐振传感器高温失效的具体情况,采取对已失效的传感器解剖分析的方法,研究传感器高温失效的机理及主要影响因素,提出传感器结构改进措施和装配工艺改进措施。在实施改进措施后,传感器高温失效的问题得到了解决。该传感器已经应用在油田现场,并获得良好的效果。 相似文献
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阐述了指挥自动化通信协议翻译软件的软件自动生成原理和实现方法,这是软件自动化在指挥自动化中的一个典型应用。该应用中采用了软件自动化的过程实现方法,定义了一种扩展标记语言,通过对扩展标记语言的语法分析,最后生成了跨平台跨语言的一组协议翻译程序,满足了指挥自动化系统中通信子系统对多协议翻译的要求,并且高效,高质量,易修改和易维护。 相似文献
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A robotic arm must manipulate objects with high accuracy and repeatability to perform precise tasks. There are many factors
that cause variations in performance and they referred as noise factors. A probabilistic approach has been used to model the
effects of noise factors and an experimental design technique has been adopted to select optimal tolerance of kinematic and
dynamic parameters for minimal performance variations. The control and noise factor arrays are employed to identify statistically
significant parameters and their interactions. The performance measures like signal to noise ratio and reliability have been
utilized and results are validated by Monte Carlo simulations. The proposed design of experiment methodology requires minimal
computations. The tolerance design methodology of manipulator is illustrated by 2-DOF revolute–revolute planar manipulator
following cubic and quintic trajectory to perform a task. The statistical analysis of simulated performances is carried out
using analysis of variance technique, which showed that statistically significant parameters are independent of trajectory.
The individual parameter tolerance sensitivity has also been carried out. 相似文献
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Dongwoon Choi Dong-Wook Lee Duk Yeon Lee Ho Seok Ahn Hogil Lee 《Artificial Life and Robotics》2011,16(3):315-317
In this article, an android robot head is proposed for stage performances. As is well known, an android robot is a type of
humanoid robot which is considered to be more like a human than many others types. An android robot has human-like joint structures
and artificial skin, and so is the robot which is closest to a human in appearance. To date, several android robots have been
developed, but most of them have been made for research purposes or exhibitions. In this article, attention is drawn to the
more commercial value of an android robot, especially in the acting field. EveR-3, the android robot described here, has already
been used in commercial plays in the theater, and through these it has been possible to learn which features of an android
robot are necessary for it to function as an actor. A new 9-DOF head has been developed for stage performances. The DOF are
reduced when larger motors are used to make exaggerated expressions, because exaggerated expressions are more important on
the stage than detailed, complex expressions. LED lights are installed in both cheeks to emphasize emotional expressions by
changes in color in the way that make-up is used to achieve a similar effect on human faces. From these trials, a new head
which is more suitable for stage performances has been developed. 相似文献
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近年来的许多研究表明,随着网络带宽的增大,业务量不断增多,网络中的数据流呈现出自卡相似性,具有很强的长相关特点,这就使得传统的基于短相关的Markov流量分析方法不再适用,该文对渐进自相似流进行了分析,在分析了系统输入固定数据量叠加的ON-OFF重尾间隔流排队模型基础之上,提出了随机接入重尾数据流的准入控制算法,并进行了仿真分析。 相似文献