Experimental study of partially-cured Z-pins reinforced foam core composites：K-Cor sandwich structures

This paper presents an experimental study of a novel K-Cor sandwich structure rein- forced with partially-cured Z-pins. The influence of pultrusion processing parameters on Z-pins characteristics was studied and the effect of Z-pins on mechanical properties was disclosed. Differential scanning calorimetry （DSC） and optical microscopy （OM） methods were employed to determine the curing degree of as-prepared Z-pins and observe the implanted Z-pins in the K-Cor structure. These partially-cured Z-pins were treated with a stronger bonding link between face sheets and the foam core by means of a hot-press process, thereby decreasing burrs and cracking defects when the Z-pins were implanted into the Rohacell foam core. The results of the out-of-plane tensile tests and the climbing drum peel （CDP） tests showed that K-Cor structures exhibited superior mechanical performance as compared to X-Cor and blank foam core. The observed results of failure modes revealed that an effective bonding link between the foam core and face sheets that was provided from partially-cured Z-pins contributed to the enhanced mechan- ical performances of K-Cor sandwich structures.     

Uncertain multiobjective redundancy allocation problem of repairable systems based on artificial bee colony algorithm

Based on the uncertainty theory, this paper is devoted to the redundancy allocation problem in repairable parallel-series systems with uncertain factors, where the failure rate, repair rate and other relative coefficients involved are considered as uncertain variables. The availability of the system and the corresponding designing cost are considered as two optimization objectives. A crisp multiobjective optimization formulation is presented on the basis of uncertainty theory to solve this resultant problem. For solving this problem efficiently, a new multiobjective artificial bee colony algorithm is proposed to search the Pareto efficient set, which introduces rank value and crowding distance in the greedy selection strategy, applies fast non-dominated sort procedure in the exploitation search and inserts tournament selection in the onlooker bee phase. It shows that the proposed algorithm outperforms NSGA-II greatly and can solve multiobjective redundancy allocation problem efficiently. Finally, a numerical example is provided to illustrate this approach.     

基于多信号模型的空间站某典型产品测试性建模与分析

测试性建模与分析在提高产品的测试性设计水平上,发挥的作用越发重要.基于多信号流图模型方法,以某典型产品为例,分析其工作原理和结构,建立其测试性模型.根据分析结果,采用增加测点、断开反馈回路的方法,改进了模型的测试性设计,提高了其测试性指标.     

全同光纤布拉格光栅单纤复用能力的研究(英文)

本文从理论上研究和分析了一种基于OTDR和TDM技术的新型光纤布拉格光栅复用方法的复用能力。这种方法可以在同一根光纤上复用成百个全同的低反射率布拉格光栅,从而使布拉格光栅传感器在航空航天健康监测领域得到更广泛的应用。分析表明,当布拉格光栅的反射率足够低时,系统的复用能力可以大大提高。因此,基于这种复用方法,可以实现廉价的大规模分布传感系统。在评价这种系统的复用能力时,我们第一次提出应该考虑光栅间多次反射光的干涉效应的影响。     

高校“双困”毕业生就业难点及就业对策探析

高校"双困"毕业生是就业的特殊群体,要实现"双困"毕业生的充分就业,国家应该从政策上加大扶持力度;高校要有针对性地进行专业技能拓展、心理健康教育和就业指导,提高学生的综合素质能力;"双困"生也应认清就业形势,转变观念,培养自身能力,提升就业竞争力。只有从多方面入手,才能最终达到充分就业的目的。     

基于多反馈延迟技术的雷达杂波模拟器实现

提出采用多反馈延迟的改进卷积处理技术实现雷达杂波模拟,克服了单反馈延迟输出杂波数据周期重复的缺点,使杂波数据在整个I周期内不重复,带来的好处是杂波逼真度高.采用大容量动态存储技术实现数据存储电路的设计,优点是方便快捷地为卷积器提供数据.     

轻负荷磁头的动态特性

本文采用有限差分法求解非定常修正Ｒｅｙｎｏｌｄｓ方程，采用四阶Ｒｕｎｇｅ－Ｋｕｔｔａ法求发磁头滑块的动力方程组，分别计算出磁头滑块受到冲击或飞越各种障碍物时的动态响应，较全面地反映了磁头滑块的动态时域特性。     

固体火箭发动机概率设计数字模拟

应用数字模拟技术，对固体火箭发动机进行概率设计，并将计算结果与用一次二阶矩可靠度分析方法得到的结果进行比较，结果表明，在应力和强度分布函数及其功能函数相同的情况下，两者结果一致。     

低速风洞滑流试验中的几个影响因素与修正方法探讨

螺旋桨飞机带动力模型的风洞实验结果的准精度远较无动力实验差。在采用了先进的高转速大功率螺旋桨驱动电机及稳转速控制系统后,情况大有改善。但对不同期实验结果的吻合性仍无明显改进。本文基于螺旋桨飞机模型风洞实验动力模拟原理和基本的实验方法,对带动力实验过程中影响实验重复性精度的各种因素进行了分析,指出风洞温度、大气压和速压偏差是影响风洞滑流实验准精度的三个主要因素。并给出了三个影响因素对实验结果影响的修正方法。实践证明,按文中提供的滑流补偿实验法进行实验可以基本消除因风洞温度和大气压变化对实验结果的影响。速压偏差影响也可以按文中提供的数据处理方法得到较为满意的修正。考虑上述修正后,不同时间的滑流实验的准精度可与无动力实验相比,特别对阻力分量的准精度的提高尤为显著。     

Hybrid power sources for pulsed current applications

A battery-capacitor hybrid power source was discharged under pulsed current conditions and various ambient temperatures. Significant improvements in voltage drop and run time were obtained with the hybrid device over the battery alone. An equivalent circuit was established to evaluate the voltage behavior of the hybrid device. It was found that at the peak discharge current, as much as 50% of the total energy supplied was provided by a capacitor with only about one-third of the battery's volume