Effect of Ni interlayer on strength and microstructure of diffusion-bonded Mo/Cu joints

Mo and Cu were bonded successfully by means of diffusion bonding using a Ni interlayer. The tensile strength of the joint increases firstly and then decreases with the bonding temperature or holding time increases. Compared with 79 MPa which was the maximum value of Mo/Cu joint, the maximum tensile strength of joint with Ni interlayer was 97 MPa. The interfacial structure of the joints was studied by SEM, EPMA, EDS and XRD, the results showed that the different atoms diffused to each other in the bonding process and no intermetallic compound appeared. MoNi and NiCu solid solutions formed in the joint. The fracture of the joint had taken place in the Mo/Ni interface rather than in the Ni/Cu interface and the fracture way of the joints was brittle fracture.     

One new onboard calibration scheme for gimbaled IMU

In most cases, a gimbaled inertial measurement unit (IMU) can provide more accurate navigation information than a strap-down IMU when there is no navigation aiding of global positioning system (GPS) or other equipments. The gimbaled IMU is still used in self-contained precision navigation systems such as launch vehicles, missiles and vessels.     

基于闭排队网络的舰载机出动架次率分析

为提升舰载机出动能力,科学计算舰载机出动架次率,提出一种基于闭排队网络理论的舰载机出动架次率计算方法。将舰载机出动回收过程相关的处理阶段抽化成闭排队网络中的节点,构建了基于闭排队网络的舰载机出动架次模型,研究了具有Fork-Joint节点的闭排队网络的改进启发式平均值分析方法,并采用改进的均值分析方法对模型进行求解,应用典型案例对舰载机数量、故障检测时间、同时起降数量等因素对舰载机触动架次率的影响进行分析,给出了舰载机出动架次率与各变量之间的关系曲线。该研究结果可为提升舰载机出动能力,以及优化舰载机作战训练操作运转流程提供量化依据和决策方法。