煤矸石浸水路堤不均匀沉降研究

首先通过对安徽淮南地区煤矸石进行室内材料试验,重点完成了抗剪强度、压缩模量等力学性能试验,结果表明其满足公路路堤材料的力学性能要求。采用ABAQUS有限元法分析不同影响因素对煤矸石浸水路堤路堤顶面处不均匀沉降的影响,对不同条件下路堤模的竖向顶面不均匀沉降并进行了参数敏感性分析。最后量化分析了各要素的影响程度并对其变化规律进行了研究。     

不锈钢薄壁长套半圆件加工变形及对策

简要阐述了不锈钢薄壁长套半圆环形结构零件的加工中遇到的问题,加工方法及控制变形的一些措施,分析了变形产生的原因和解决方法,能够较好的符合图纸要求。     

从测量数据中提取古塔的变形信息

出于文物保护,从大量的测量数据中提取古塔的变形信息,结合形心、质心、近心等概念,设计出确定古塔各层中心位置的通用算法,并给出了数据有缺陷时的补救措施。为了提取倾斜度信息,建立起空间直线的对称型拟合模型,提供了简单实用的目标函数及其初值优化的搜索方法。为了避免信息失真,构造出直接利用原始数据计算扭曲度的公式。经过深入剖析,厘清了某些流行算法的认识误区。     

多项式插值拟合在建筑物荷载变形监测中的应用

文章介绍了拉格朗日插值和最小二乘曲线拟合两种方法,进行对比分析,对数据进行曲线插值拟合,并进行预测精度对比,最后通过实例解算论述了两种方法在建筑物荷载变形监测中都有一定的应用价值。     

塑料排水板可伸缩式插板枪的接头分析与实验研究

当塑料排水板手工插板枪超过5米时,由于单根长度太长携带很不方便。此外,在插板过程中,插板枪晃动等问题明显影响使用。本文针对一种新型的塑料排水板可伸缩式两段式插板枪,设计了其接头机械结构,分析了其接头的摩擦特性和受力状态,并通过现场插板实验验证了这种应用在大深度场合的两段式插板枪的功能和效率。     

虚拟现实环境下软管布线仿真

针对软管变形的特点及影响因素,提出一种面向虚拟现实环境布线应用的软管几何变形数学建模算法.采用Gossard变形能方程和双段三次开放均匀B-样条曲线建立软管变形的能量函数;然后分别阐述几何约束和连续性问题处理方法;而后通过能量函数的极小化求解,获得曲线控制点位置,从而实现对软管变形数学建模;最后通过实验验证上述算法的正确性.这种算法计算量小,模型逼真,能够在不违背软管物理特性的基础上实现对软管形状进行控制,对拓展虚拟现实技术的应用范围有重要意义.     

Effects of light refraction on the accuracy of camera calibration and reconstruction in underwater motion analysis

One of the most serious obstacles to accurate quantification of the underwater motion of a swimmer's body is image deformation caused by refraction. Refraction occurs at the water‐air interface plane (glass) owing to the density difference. Camera calibration‐reconstruction algorithms commonly used in aquatic research do not have the capability to correct this refraction‐induced nonlinear image deformation and produce large reconstruction errors. The aim of this paper is to provide a thorough review of: the nature of the refraction‐induced image deformation and its behaviour in underwater object‐space plane reconstruction; the intrinsic shortcomings of the Direct Linear Transformation (DLT) method in underwater motion analysis; experimental conditions that interact with refraction; and alternative algorithms and strategies that can be used to improve the calibration‐reconstruction accuracy. Although it is impossible to remove the refraction error completely in conventional camera calibration‐reconstruction methods, it is possible to improve the accuracy to some extent by manipulating experimental conditions or calibration frame characteristics. Alternative algorithms, such as the localized DLT and the double‐plane method are also available for error reduction. The ultimate solution for the refraction problem is to develop underwater camera calibration and reconstruction algorithms that have the capability to correct refraction.     

无面板式高陡加筋土挡墙的变形特性分析

在高陡填方区采用土工格栅加筋土挡墙,容易产生较大变形,且至变形稳定持续时间长。文章以某填方边坡为例,对无面板式加筋土挡墙的变形性状进行分析,分析结果表明,无面板式高陡加筋土挡墙的大变形,主要是地质条件、填料及土工格栅材料、施工条件、面板等综合影响。基此,提出了防患加筋土挡墙变形的相应建议。     

基于BP网络的MEM200快速成形机工艺参数优化

对影响FDM制件翘曲变形的各种工艺参数进行深入分析,结合MEM200快速成形机的特点,确定了影响翘曲变形的五个主要的工艺参数,利用正交试验对主要影响因素进行了实验研究,为神经网络预测模型提供了学习样本。采用贝叶斯正则化算法,通过分析比较确定网络的最佳结构,以提高网络对翘曲变形和成形时间的预测能力。在此基础上,采用优化算法,利用Matlab编制程序实现了工艺参数的优化,经成形验证,表明了该方法能够减少制件的翘曲变形。     

A new plastic surgical technique for adult congenital webbed penis

Objective: To introduce a novel surgical technique for correction of adult congenital webbed penis. Methods: From March 2010 to December 2011, 12 patients (age range: 14–23 years old) were diagnosed as having a webbed penis and underwent a new surgical procedure designed by us. Results: All cases were treated successfully without severe complication. The operation time ranged from 20 min to 1 h. The average bleeding volume was less than 50 ml. All patients achieved satisfactory cosmetic results after surgery. The penile curvature disappeared in all cases and all patients remained well after 1 to 3 months of follow-up. Conclusions: Adult webbed penis with complaints of discomfort or psychological pressure due to a poor profile should be indicators for surgery. Good corrective surgery should expose the glans and coronal sulcus, match the penile skin length to the penile shaft length dorsally and ventrally, and provide a normal penoscrotal junction. Our new technique is a safe and effective method for the correction of adult webbed penis, which produces satisfactory results.