Design and Analysis of Elastic Component of Resonant Cylinder Pressure Sensor

利用有限元分析软件AnSyS对振筒式压力传感器弹性元件——谐振筒进行了动态特性仿真分析,建立了谐振筒的参数化模型,基于模态分析选定合适的工作振型,重点利用谐响应分析讨论了谐振筒品质因数的影响因素。研究表明,当谐振筒的基模态为(4,1)模态时,品质因数随谐振筒外半径、有效长度以及壁厚的增加而减小,而工作时作用于谐振筒的激励载荷只改变了谐振筒振幅大小,对品质因数无明显影响。通过瞬态动力学分析计算得到谐振筒的调节时间,证明了谐振筒具有较好的动态响应特性。为谐振筒的结构设计和优化提供了参考。Simulation and analysis on dynamic behavior of resonant cylinder which composed the pressure sensor as the elastic component are conducted using the finite element analysis software ANSYS.Parametric model is established.Based on the modal analysis,an appropriate mode for work is selected out.Factors affecting quality factor are discussed mainly through harmonic response analysis.Results indicate that,when the cylinder worked on(4,1) mode,quality factor would decreases as radius,effective length or thickness increase,while the force only had an influence on the amplitude of the vibration rather than the quality factor.Adjusting time is obtained by transient dynamic analysis,thus proving the rapidity of resonant cylinder.The study provides reference both for structure design and optimization

OPGW断股状态的光学监测技术研究

针对OPGW（光纤复合架空地线）易发生断股的现象,提出了采用布里渊光时域反射仪测量其内部光纤应变的断股检测方法。实验中将一段OPGW的两端固定在拉力机上并施加固定的拉力值,逐渐增加OPGW中断开的单丝数,记录布里渊光时域反射仪测量的光纤应变值。实验结果表明,该方法可实现对25%以上的断股区域截面积比的监测,为在线监测OPGW断股状态提供了一种新的思路

咸水灌溉对塔里木沙漠公路防护林植物生长的影响/Effects of saline water irrigation on plants growth of the Tarim Desert Highway shelter-belt[J]

通过不同矿化度成水造林实验和对塔里木沙漠公路防护林工程沿线不同矿化度水灌溉林地进行定位调查,选取成活率、株高、冠幅、地径、地上生物量及结实状况等反映造林苗木生长状况的常规指标,分析了不同矿化度成水灌溉对乔木沙拐枣(Calligonum arborescons)、梭梭(Haloxyloammodendron)和多枝柽柳(Tamarix ramosissima)3种植物生长状况的影响.研究结果表明,灌溉水矿化度对这3种植物的成活、营养生长和结实均有显著影响.随矿化度升高,整体表现为抑制作用;盐胁迫影响程度与灌水矿化度存在阈值变化现象.灌溉水矿化度在20 g/L以上时,梭梭不能结实,但成活和生长基本未受影响;乔木沙拐枣和多枝柽柳的存活阈值为15～20 g/L,抗盐阈值分别在15 g/L和20g/L左右;3种植物抗盐能力依次为:梭梭>多枝柽柳>乔木沙拐枣