动态数据自适应控制中的质量控制

动态数据的质量控制是要求其动态数据处理过程中能够自动检测出系统模型中的偏差,并消除这些偏差对估计结果的影响。本文按照统计质量控制方法,以Kalm an滤波作为动态数据处理方法,讨论了含有偏差的动态数据处理模型,基于偏差探测的假设,构造了偏差探测的统计检验量及基本公式,并对偏差识别的过程及统计检验作了分析,最后得到了偏差估计和校正的理论公式。     

浅谈GPS RTK测量技术的应用

GPSRTK测量技术以其高效率、高精度的优点得到测绘及相关单位的广泛应用。文章主要就GPSRTK的测量原理、基本配置、GPSRTK的应用及作业时注意事项进行了讨论,同时对GPSRTK测量技术与传统测量技术进行了对比,阐述了GPSRTK测量模式的优势和广泛的应用前景。     

参数化绘图中主参数的研究

介绍了二次开发的基本原理,分析了部件引用和创建与编辑图形对象的过程,通过分析V带轮的结构特点,确立了主参数,并建立一个参数化绘图的数学模型,最后阐述了参数化绘图事件过程。     

BMimBF_4和BMimPF_6二元复合离子液体的特性

研究了BMimBF4、BMimPF6及其二者不同体积比复合离子液体的运动粘度、电化学窗口及电导率。结果表明,通过简单地调节BMimBF4和BMimPF6的复合体积比,可以改变BMimBF4和BMimPF6二元复合离子液体的物理化学性质,充分发挥离子液体的"可设计"性,为"绿色溶剂"离子液体的应用开辟了新的道路。     

危险工程环境中六足步行机器人运动学建模及动作协调初探

研究了六轮步行机器人的运动学建模.给出六轮各自的控制量和整车运动状况之间的关系;解决六轮协同问题,在运动中尽量减少轮系的内应力;提高能源利用率.     

CAD中的参数化设计

文章讨论了参数化二维图形的组成及其关联关系 ,研究了图形结构约束模型和尺寸约束模型的建立方法和驱动求解等关键技术 ,为CAD中系列化产品设计提供了一种有效手段     

Human Body Modeling and Posture Simulating Based on 3D Surface Scan Data

This paper presents a new approach for modeling the human body by considering the motion state and the shape of whole body. The body model consists of a skeleton kinematic model and a surface model. The former is used to determine the posture of the body, and the latter is used to generate the body shape according to the given posture. The body surface is reconstructed with multi-segment B-spline surfaces based on the 3D scan data from a real human body. Using only a few joints parameters and the original surface scan data, the various body postures and the shape can be generated easily. The model has a strong potential of being used for ergonomic design, garment design, virtual reality environment, as well as creating human animation, etc.     

An Optimized Constraint Decomposition Method in Concurrent Engineering

In order to facilitate solution, a complex problem is normally decomposed into many small sub-problems during product development process. Teams are formed to resolve each sub-prob-lem. The original problem is resolved from solutions of sub-problems. Ideally, sub-problems are not only mutually independent but also inherent parameters of original problem. Solution of origi-nal problem can be directly derived from the collection of solutions from simplified sub-problems.In practice, the degree of interdependency is indeed reduced, sub-problems are neither totally in-dependent nor all inherent parameters of original problem. This paper discusses team coordination under this condition and design solution from each team, which not only satisfies total require-ments but also is an optimal one. The suggested optimized constraint deoomposition method will insure workable Pareto solution.     

Minimizing the integer ambiguity search space for RTK

Differential GPS carrier phase measurements have much lower noise and multipath error than that of pseudorange measurements.The result is centimeter accuracy for Real-Time Kinematic (RTK).However, the measurement of the carrier phase has a constant unknown integer ambiguity. Several technical issues are related to solving the integer ambiguity correctly. They are: proper stochastic model, search space definition and initialization, search space reduction, state and standard deviation calculation, validation and rejection criteria for the unique and correct candidate. Search space reduction is critically important. It not only affects the ambiguity resolution speed, but also defines the ambiguity resolution success rate. The smaller the search space, the easier it is to find the unique and correct candidate set. The paper analyzes the integer ambiguity search space in its residual domain.The search space is minimized by: Analyzing the maximum independent integer ambiguity measurement set theoretically; Selecting the best initial measurement set that minimizes the search range of each satellite in the set and reduces the error effects from noise that may cause the wrong integer ambiguity solution for the remaining satellites not contained in the initial measurement set.Since the Residual Sensitive Matrix (S-Matrix) relates the integer ambiguity candidate set directly to post-fix residuals, it is not necessary to compute a fix for each candidate set thus making the integ erambiguity search process much more efficient. Also, minimizing the search space in the residual domain improves the search efficiency significantly and at the same time improves its reliability. Performance issues, such as recursive and weighted search techniques as well as methods for improving reliability, are also discussed in the article.     

状态二次型线性最优控制

本文研究一类性能指标中没有能量项,且控制是受约束的线性二次型最优控制问题,证明了两个分别适用于状态矩阵为稳定阵和非稳定阵的定理。按照本文给出的结果,最优控制是开关型的,而且容易在实时控制中实现。