摘要：For unacceptable computational efficiency and accuracy on the probabilistic analysis of multi-component system with multi-failure modes,this paper proposed multi-extremum response surface method(MERSM).MERSM model was established based on quadratic polynomial function by taking extremum response surface model as the sub-model of multi-response surface *** dynamic probabilistic analysis of an aeroengine turbine blisk with two components,and their reliability of deformation and stress failures was obtained,based on thermal-structural coupling technique,by considering the nonlinearity of material parameters and the transients of gas flow,gas temperature and rotational *** results show that the comprehensive reliability of structure is 0.9904 when the allowable deformations and stresses of blade and disk are 4.78×10–3 m and 1.41×109 Pa,and 1.64×10–3 m and 1.04×109 Pa,***,gas temperature and rotating speed severely influence the comprehensive reliability of *** the comparison of methods,it is shown that the MERSM holds higher computational precision and speed in the probabilistic analysis of turbine blisk,and MERSM computational precision satisfies the requirement of engineering *** efforts of this study address the difficulties on transients and multiple models coupling for the dynamic probabilistic analysis of multi-component system with multi-failure modes.

摘要：因为便携、低成本、集成化等优势,微型光谱仪已经成为光谱仪技术发展的重要趋势,其中工作波段在近红外的微型光谱仪,在光纤传感和解调、光纤通信等领域有着非常广泛的应用。但目前的近红外微型光谱仪普遍存在分辨率低、成本高、体积大不便于携带等问题,为此,提出了一种独特的基于双光栅和柱透镜的微型光谱仪结构,开展了理论和实验研究。相对于传统的微型光谱仪结构,新的设计主要有三个特征:使用光纤代替入射狭缝,以减少光能损失;采用双光栅将光束进行二次衍射;使用柱透镜以改变线阵CCD阵列表面的成像尺寸。首先,利用Zemax软件进行了光学设计和仿真分析,光谱范围为1525~1570 nm,光学系统结构在66 mm×40 mm×24 mm的体积范围内,光谱分辨率理论上达到0.2 nm,比未加柱透镜的结构提升了2.5倍。然后,根据理论分析,选购了合适的光电器件进行了系统封装,与匹配的电路模块结合,实现了微型光谱仪的光谱检测功能。光谱仪的光学系统安装在66 mm×40 mm×30 mm的体积范围内,实际测量的光谱分辨率为0.215 nm,与理论结果较为吻合。进一步地,搭建了一套基于该微型光谱仪的光纤光栅温度传感测量系统,该微型光谱仪作为信号解调仪,选择了四个中心波长分别为1534、1538、1542和1545 nm的光纤光栅作为传感器,温度在0~50℃范围内以1℃为间隔连续变化,最终实现了温度实时测量和信号解调,系统温度灵敏度分别达到9.58、9.68、9.69和9.6 pm·℃^(-1),验证了该微型光谱仪的高分辨率和高可靠性。研制的微型光谱仪的子组件可以固定在外壳上,系统内部无可移动元器件,体积小、分辨率高、稳定性好,可应用于其他诸如物质浓度分析、传感信号测量等需要高分辨光谱分析的场合。

摘要：“光纤光学基础实验”是面向光电信息科学与工程专业本科生和光学工程专业研究生开设的重要的实验课程。分析了“光纤光学基础实验”教学中存在的主要问题,结合该课程核心知识点和教学目标,优化了“光纤光学基础实验”的主要教学内容。通过更换精度更高的光学器件,提高了光学元件调节效率及读出分辨率;采用云班课软件构建线上线下混合式教学,及时追踪实验教学全过程,达到了提升教学效果的目的;采用项目研讨式教学,调动了学生参与实验的主观能动性。

摘要：The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic *** this work,a new polymer acceptor PY9-T based on heptacyclic benzotriazole(Y9-C16)as a building block and thiophene unit as the linking unit was synthesized,which exhibited a low bandgap(1.37 eV)and a high extinction coefficient of the neat film(1.44×10^(5) cm^(−1)).When PY9-T was blended with the wide bandgap polymer donor PBDB-T,the all-polymer solar cells(APSCs)showed a high power conversion efficiency(PCE)of 10.45%with both high open circuit voltage of 0.881 V and short-circuit current density of 19.82 mA/cm^(2).In addition,APSCs based on PY9-T show good thermal stability,as evidenced by slight changes morphologies when annealed at 100℃.These results suggest that Y9-C16 provides a new building block to develop efficient and stable polymer acceptors.

摘要：利用“液电效应”产生的等离子体冲激声源在岩石破碎、地质导向、确定位置等方向有巨大的应用价值,目前关于等离子体放电回路中充电电压与放电特性、冲激波特性的关联性仍缺乏进一步深入了解。基于水下等离子体放电实验平台,建立水下等离子体冲激声源的仿真模型,对比分析冲激声源放电典型的电压、电流及冲激波波形的实测和仿真结果,通过仿真模型研究不同充电电压下的放电特性与冲激波特性。结果表明,当充电电压从15 kV提高到25 kV时,冲激波强度峰值增大了31.9%,冲激波能量增大了53.8%,因外电路能量增加速率大于冲激波能量增加速率促使其转化效率降低了28.4%。通过改变充电电压来预测冲激波特性,对比分析不同充电电压下的冲激波强度、能量损耗及能量转化效率等,为水下冲激声源不同工程应用选取最佳的充电电压提供参考依据,也可根据充电电压对冲激波特性影响来设计水下等离子体冲激声源的充电储能部分。

摘要：The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor *** to chlorination,however,it gets less attention and remains ambiguous effect on organic photovoltaic(OPV)***,a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups.Y19 exhibits a wide film absorption band from 600 nm to 948 nm and low LUMO(the lowest unoccupied molecular orbital)energy level of−3.95 *** devices based on PM6:Y19 show high-power conversion efficiency(PCE)of 12.76%with high open-circuit voltage(Voc)of 0.84 V,short-circuit current density(Jsc)of 22.38 mA/cm2 and fill factor(FF)of 68.18%.Broad external quantum efficiency(EQE)response of over 60%in the range of 480−860 nm can be *** study demonstrates that chlorination,as a low-cost molecular design strategy,has its own superiorities to improve device performance and promote the potential application in OPV.

摘要：根据液体灌装产品的生产流程,进行多工位回转式旋盖机的整体结构和主要参数设计,并绘制装配图;通过计算设计出旋盖机圆柱凸轮的凸轮轮廓曲线,并采用五次多项式拟合对曲线进行优化,最终在SolidWork中建立凸轮的三维实体模型。结果表明,该多工位回转式旋盖机实际生产效率可达14000瓶/h,高速运转下运行稳定,且产生的噪声相对较小,满足要求。

摘要：为了更加及时准确地检测SF6断路器的泄漏情况以及气室内SF6气体的体积分数,在分析了现有SF6断路器检漏技术的基础上,主要利用红外吸收光谱法,设计出了全光纤光学式SF6红外气体传感器及SF6气体体积分数检测系统。仿真及实验研究结果表明,SF6与空气的混合气体中的SF6气体的体积分数<10-3时,SF6气体体积分数与吸光度满足线性关系。所以可以应用该技术对装有SF6断路器的室内进行气体体积分数检测,而且该检测系统具有极其明显的技术优势和广泛的应用价值。

摘要：在低温储运时,由于真空夹层中材料的放气,夹层真空度会下降,热量从外界导入使得低温容器的蒸发率加大,低温液体损耗增加,真空寿命缩短。因此,对真空夹层中材料放气性能的研究非常重要。本文基于静态升压测量法,搭建了真空下材料放气率测试装置,进行了低温储罐用多层绝热材料和玻璃钢真空下放气速率测试研究,得到了多层绝热材料和D3848玻璃钢的单位面积放气速率分别为4.93×10^(-8)Pa·m^(3)/(s·m^(2))和1.13×10^(-7)Pa·m^(3)/(s·m^(2)),该结果可以为真空夹层吸附剂量的设计提供可靠依据。

摘要：针对目前板书教学系统产生许多危害健康的因素,运用TRIZ理论及解决方法对目前板书教学系统进行组件与功能分析并绘制功能模型图,从分析结论可以得到该系统存在3个具有危害性的因素,进而使用技术矛盾分析、物理矛盾分析及物场模型分析该系统并使用TRIZ工具中的发明原理与标准解来解决该系统中存在的问题并获得新的设计方案,最后通过方案总结获得最佳结论方案。