大有光全拉伸丝织造前准备工艺探索

主要从大有光全拉伸丝(FDY)的性能出发,并结合织造过程,讨论整浆并前准备阶段的工艺要求,以达到提高织造效率、降低织疵的目的。     

热固性塑料精密注射模设计

针对采用普通热固性塑料注射模成型出的塑件所出现的工艺问题,设计了一副带有浮动型芯结构的热固性塑料精密注射模,有效克服了塑件表面凹陷、翘曲等缺陷,使塑件成型面达到较高的平面度。实践证明,塑件合格率得到了显著提高,取得了较好的经济效益。     

基于时间序列匹配的过山车定位法

针对过山车难以精准定位的问题,本文提出了一种基于时间序列匹配的过山车定位方法。该方法首先使用动态时间规整(DTW)对惯性测量单元(IMU)的实测与仿真数据进行序列匹配,得到位置估计结果。之后将估计结果作为观测量,在误差状态卡尔曼滤波器(ESKF)中修正IMU预测结果,得到精准的定位结果。为了提高估计结果的准确度,本文提出了分段重组动态时间规整(SRDTW)算法,解决了DTW的匹配失真问题。使用本文方法对过山车进行了定位实验,结果表明,使用Z向加速度和俯仰角进行序列匹配可得到较为准确的估计结果;ESKF滤波后的平均定位误差可达0.24 m,较估计结果的定位误差减小45.6%。     

注塑齿轮结构特征与翘曲关系的研究

针对注塑齿轮翘曲的问题,从注塑齿轮参数化建模的角度出发,分析齿轮的模数和腹板厚度对翘曲变形的影响。运用NX8.5和Moldflow进行建模和翘曲分析,结果显示收缩不均是引起翘曲变形的主要因素,所以选取收缩不均引起的最大翘曲变形量为目标参数。通过分析,得出模数和腹板厚度及其交互作用对目标参数的影响规律曲线,并用Matlab对曲线进行拟合,对结构参数和目标参数之间的关系用数学方程进行描述,为注塑齿轮的参数化设计提供一定的参考。     

基于预变形的汽车水室翘曲变形控制

将三坐标测量汽车水室的翘曲变形量和MoldFlow模拟仿真的理论翘曲变形量进行比较分析,探讨预变形设计对水室成型精度的影响规律,最后采取预变形补偿技术控制汽车水室的翘曲变形量。结果表明:优化补偿后的制品装配面翘曲变形误差最大值从1.24 mm减少到0.47 mm,满足了制品的精度要求。     

浅析隐性绞经档

结合生产实践 ,提出“隐性绞经档”概念 ;并系统的分析了精纺毛织物织造准备时 ,产生隐性绞经档的原因和预防弥补的措施。     

Multi-View Scene Capture by Surfel Sampling: From Video Streams to Non-Rigid 3D Motion,Shape and Reflectance

In this paper we study the problem of recovering the 3D shape, reflectance, and non-rigid motion properties of a dynamic 3D scene. Because these properties are completely unknown and because the scene's shape and motion may be non-smooth, our approach uses multiple views to build a piecewise-continuous geometric and radiometric representation of the scene's trace in space-time. A basic primitive of this representation is the dynamic surfel, which (1) encodes the instantaneous local shape, reflectance, and motion of a small and bounded region in the scene, and (2) enables accurate prediction of the region's dynamic appearance under known illumination conditions. We show that complete surfel-based reconstructions can be created by repeatedly applying an algorithm called Surfel Sampling that combines sampling and parameter estimation to fit a single surfel to a small, bounded region of space-time. Experimental results with the Phong reflectancemodel and complex real scenes (clothing, shiny objects, skin) illustrate our method's ability to explain pixels and pixel variations in terms of their underlying causes—shape, reflectance, motion, illumination, and visibility.     

Theoretical research on naturally curved and twisted beams under complicated loads

This paper presents an analytical method for the study of naturally curved and twisted beams under complicated loads, with special attention devoted to the solving process of governing equations which take into account the effects of torsion-related warping as well as transverse shear deformations. The solutions derived in this paper can be used for the analysis of the beams, including the calculation of various internal forces, stresses, strains and displacements. These governing equations, in special cases, can be readily solved and yield the solutions to the problem. A generalized warping coordinate for a curved coplanar beam subjected to the action of vertical distributed loads is given for verification.     

丹江口水库排沙清淤方法探讨

丹江口水库作为南水北调中线工程的源水库,延长其使用寿命、保证其长久良好地运行,不但有重要的经济意义,而且有更重要的社会意义。排沙清淤是保证丹江口水库能长期运用良好的重要措施。根据丹江口水库的自身特性,在变动回水区及其附近进行“防治型”排沙清淤是治理库区淤积泥沙的有效途径,与传统的坝前“治疗型”排沙清淤相比有许多优越之处。     

基于混合属性的产品优化聚类算法

针对分类研究中采用单一类型数据造成的结果失真, 提出了综合考虑产品属性和销售时间序列的两阶段优化聚类算法。分别采用基于属性的相似性排序及时间序列的分层优化聚类实现产品单独聚类, 然后基于初始聚类结果及参数化的动态相对权重提出考虑噪声数据处理的分层聚类方法实现产品综合优化分类。企业实例应用研究表明综合聚类模型及两阶段算法在聚类精度及时间复杂度上具有明显的优势, 相对权重的动态参数化设置有效解决了不同产品间个性化特征的差异表示。通用数据集的仿真进一步验证了算法在解决混合属性产品聚类问题时的优越性及广泛适用性。