偏心销结构舱段连接方式强度计算及试验验证

基于某型导弹偏心销结构舱段连接方式,推导了连接面上偏心销的最大剪力公式,并对该结构开展了有限元分析和静力试验。有限元结果表明在给定载荷作用下,偏心销材料进入塑性,偏心销限位环发生强度破坏;连接面舱体结构局部材料进入塑形,但不会发生强度破坏;试验结果验证了上述仿真结果,并根据最大剪力公式建立单个偏心销有限元计算模型是一种比较稳妥的方法。     

波音777系列飞机机身蒙皮雷击损伤的处理方法

介绍了波音777系列飞机机身蒙皮雷击损伤使用紧固件修理的流程，为实际工作中快速获取正确的工作步骤提供参考，并讨论了修理过程中存在的一些问题。     

柔性冗余度机器人振动分析与抑制

从理论上分析了利用冗余芳机器人的“自运动”克服其结构柔性引起的机器人臂末端振动的可能性及实际应用的方法,仿真结果证明了可行性。     

考虑连杆柔性和运动副粘性摩擦的曲柄滑块机构的动力学建模及计算

建立了考虑连杆柔性和运动副粘性摩擦的曲柄滑块机构的动力学数学模型,并对一个算例进行了数值仿真,结果表明,连杆的柔性和运动副的粘性摩擦对机构的运动都具有一定的影响。     

Dynamical characterization of the last prolonged solar minima

The planetary hypothesis of the solar cycle is an old idea in which the gravitational influence of the planets has a non-negligible effect on the causes of the solar magnetic cycle. The advance of this hypothesis is based on phenomenological correlations between dynamical parameters of the Sun’s movement around the barycentre of the Solar System and sunspots time series; and more especially, identifying relationships linking solar barycentric dynamics with prolonged minima (especially Grand Minima events). However, at present there is no clear physical mechanism relating these phenomena. The possible celestial influence on solar cycle modulation is of great importance not only in solar physics but also in Earth sciences, because prolonged solar minima have associated important climatic and telluric variations, in particular, during the Maunder and Dalton Minimum. In this work we looked for a possible causal link in relation with solar barycentric dynamics and prolonged minima events. We searched for particular changes in the Sun’s acceleration and concentrated on long-term variations of the solar cycle. We show how the orbital angular momentum of the Sun evolves and how the inclination of the solar barycentric orbit varies during the epochs of orbital retrogressions. In particular, at these moments, the radial component of the Sun’s acceleration (i.e., in the barycentre-Sun direction) had an exceptional magnitude. These radial impulses occurred at the very beginning of the Maunder Minimum, during the Dalton Minimum and also at the maximum of cycle 22 before the present extended minimum. We also found a strong correlation between the planetary torque and the observed sunspots international number around that maximum. We apply our results in a novel theory of Sun–planets interaction that it is sensitive to Sun barycentric dynamics and found a very important effect on the Sun’s capability of storing hypothetical reservoirs of potential energy that could be released by internal flows and might be related to the solar cycle. This process begins about 40 years before the solar angular momentum inversions, i.e., before Maunder Minimum, Dalton Minimum, and before the present extended minimum. Our conclusions suggest a dynamical characterization of peculiar prolonged solar minima. We discuss the possible implications of these results for the solar cycle including the present extended minimum.     

对称六相PMSM反串联系统的虚拟多电机等效模型

针对多电机驱动控制问题,构建了2台对称六相PMSM的反串联规则.对于串联系统中的谐波耦合问题,建立了2台对称六相PMSM反串联系统的虚拟多电机耦合模型,揭示了对称六相PMSM中偶次谐波对串联系统解耦运行的影响机理,指出转子结构的对称性设计能够消除该种谐波耦合,使系统实现解耦运行.通过对转子结构对称的2台对称六相PMSM...     

基于联系度的雷达导引头综合能力评估

文章分析了影响雷达导引头综合能力的主要因素;建立了雷达导引头综合能力评估指标体系和基于联系度的雷达导引头综合能力评估模型,并提出了联系度的比较规则;最后,得出了几种典型的雷达导引头综合能力的优劣排序.     

串并联模型框架在军用航空综合体效能评估中的应用

针对现代空战效能主要由信息、机动和火力三大要素决定的特点,应用串并联模型框架对航空综合体进行了物理和逻辑分解,并量化其各个分系统效能,用串并联模型框架建立了军用航空综合体的静态效能模型,分析了各分系统对系统效能的影响。     

壁挂式主频可调变截面小卫星结构设计与验证

针对多星并联布局“一箭多星”发射小卫星的模式，为降低星箭连接界面结构受力、提高卫星结构对不同运载火箭的主频适应性、提高星内设备安装空间利用率，本文设计了一种壁挂式主频可调变截面小卫星结构。对该卫星结构，开展了基于有限元方法的模态和静力分析验证，还开展了地面鉴定级振动试验验证和在轨飞行试验验证。分析和试验结果表明，壁挂式卫星结构相比底部连接式卫星结构，星箭连接界面受力可降低67.7%；在不增加卫星结构质量的前提下，仅通过安装或拆卸主传力路径上的部分连接螺钉，就能实现卫星3个方向一阶频率10 Hz左右的可调范围；采用沿运载火箭轴线方向横截面大小可变的变截面结构设计，可将星内设备安装空间的利用率由等截面卫星结构的49.1%提高到74.2%。     

机载双余度1553B总线的可维修性设计

介绍了机载双余度1553B总线的拓扑结构和基本的物理组成及连接关系,分析了双余度1553B总线的工作状态和线路检测的方法,从故障定位和可维修性的角度分析了不可分割连接形式的测试性,提出了可分割连接形式的设计方法,比较了两种双余度总线接口形式的特点及其对维护和维修的影响。