Institute Of Mechanics,Chinese Academy of Sciences
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多功能集成微加热器空间站在轨标定实验研究
No full text变重力池沸腾中国空间站问天实验舱变重力科学首批两项科学实验任务之一，用于研究不同重力条件下池沸腾传热性能与气泡动力学规律。作为自主研制的关键部件，多功能集成微加热器（Multi-Functional Integrated Micro-heater,MIM）采用微机电系统（MEMS）技术，在10 mm×10 mm×1 mm石英玻璃基板上加工出特定的金属铂薄膜，集成了气泡激发、温度测量和功率输入等功能，并采用COB封装技术形成独立器件。利用中国空间站在轨实验数据，以沸腾液池内液体温度的实测数据为基准，对多功能集成微加热器16路局部温度测点和主加热器的电阻-温度特性曲线进行了标定，并分析了多功能集成微加热器温度测量的不确定度。基于在轨标定结果，反演计算了变重力池沸腾空间站在轨实验中不同重力条件下的单相自然对流传热特性。研究结果表明，这些特性与经典关联式预测及同类实验数据相符，证实了在轨实验结果的可靠性
用“态-态”跃迁速率计算气体振动松弛特征时间的方法
No full text本发明公开了一种利用“态‑态”跃迁速率计算气体振动松弛特征时间的方法，包括以下过程：将处在能级i的分子振动能设为ev(i)；通过一次i→j的非弹性碰撞时，分子振动能将增加ev(j)‑ev(i)；利用任意两个振动能级i和j之间的“态‑态”跃迁速率计算气体振动能Ev的变化，联合公式(1)，以及气体状态方程p＝nkBT(kB为玻尔兹曼常数)，得到由“态‑态”跃迁速率计算振动松弛特征时间的方法。本发明采用一种新的方法去计算振动松弛时间τv，能够给出平动温度T和振动温度Tv不等时的振动松弛时间τv；计算振动松弛时间τv的计算范围比较大，能够覆盖1万K以上的高温区；只需要用一些基础的物理化学数据就可以计算出振动松弛时间τv，而不用做风动实验了，大幅度降低了成本
一种固定翼飞机起降安全考核试验设备及试验方法
No full text本发明提供一种固定翼飞机起降安全考核试验设备及试验方法，包括支撑柱、轨道、电磁缓冲头和运动框架，每对轨道之上横跨有一个运动框架，所述运动框架的两端部分别套接在所述轨道的所述梁上沿轨道上下滑动；在所述运动框架上与所述轨道下行方向套接点位置处设有电磁缓冲头接头用于通电状态下和电磁缓冲头配合，使承载有所述被测飞机的运动框架在试验条件下运动到所述轨道的底端时，使所述运动框架制动，所述被测飞机在所述试验条件下脱离所述运动框架继续试验。本发明提供的试验设备可以模拟控制固定翼飞机在试验所需条件下进行起降试验，采集被测飞机的试验数据，而且运动框架适时制动，延长了试验设备的使用寿命
Post-newtonian tests of gravitational quantum field theory with spin and scaling gauge symmetry
No full textA self-consistent gravitational quantum field theory, with gravitational force treated on the same footing as the other three fundamental interactions, was established recently. The gravidynamics predicted by such a theory could lead to important implications, and the comparisons with experimental results may provide us opportunities to test such new approach of gravity based on the framework of the quantum field theory of gauge interactions. In this work, we start with the effective field equation of the gravitational quantum field theory, and then solve the perturbative gravigauge field order by order up to the 1st post-Newtonian level under the assumption of a simplified energy-momentum tensor of perfect fluids. Having the constraints on the related post-Newtonian parameters from the most up-to-date observational data, the new bound on the combined coupling in the gravitational quantum field theory |gamma G(alpha G-alpha W/2)|{-6} \end{document} is obtained. Under such bound, we found that the new gravitational quantum field theory successfully passed and found no conflict with the contemporary keynote Solar system experiments of gravity
Higher strength of double-double over traditional quad laminates in equal-stiffness design of single lap joint
No full textDouble-Double (DD) is a novel laminate design concept that not only reduces design variables and simplifies the manufacturing process but also exhibits unique homogenization properties. While theory suggests that for any QuaDriaxial (QUAD or QD) laminate, DD can provide a corresponding laminate configuration with equivalent stiffness, the mechanical behavior of their Single-Lap Joint (SLJ) still requires further investigation. In this study, a DD SLJ equivalent to the quasi-isotropic QD SLJ commonly used in fuselage structures is designed by ensuring equivalence in the in-plane stiffness matrix. While the experimental results show nearly identical in-plane stiffness, the tensile strength of the DD SLJ is approximately 13 % higher than that of the Quad SLJ. Additionally, DD SLJ exhibit reduced out-of-plane deformation compared to Quad SLJ. Both theoretical and numerical analyses are conducted to elucidate the underlying mechanisms responsible for the superior mechanical behavior of DD SLJ. The findings indicate that the observed differences are primarily due to variations in bending stiffness, despite identical in-plane stiffness matrices. The results further demonstrate that the smaller bending deformation of DD laminates leads to reduced interfacial peeling forces, making DD SLJ less susceptible to failure. Finally, a comparison of different staggered ways of DD laminates indicated no significant differences in strength or stiffness. The study demonstrates that DD SLJ, designed with equivalent in-plane stiffness matrices, not only achieve the same tensile stiffness as QD SLJs but also exhibit higher strength. This highlights the great potential of DD laminates for application in the single-lap joints of aircraft structures
一种电加热空气滤芯及低能耗空气高温杀毒灭菌装置
No full text本发明提供一种电加热空气滤芯及低能耗空气高温杀毒灭菌装置，该电加热空气滤芯包括耐高温初效过滤棉、金属铝网、绝缘电热丝、耐高温高效空气滤芯；金属铝网安装于耐高温高效空气滤芯的进风口，并与滤芯的铝箔纸隔板贴合；绝缘电热丝固定在金属铝网上，初效耐高温过滤棉覆盖于金属铝网表面；绝缘电热丝两端与工作电源相连。本发明的电加热空气滤芯中的绝缘电热丝能够在通电阶段对初效过滤棉和耐高温高效空气滤芯同时加热，对附着在两者之上的细菌病毒进行高温消杀；本发明的灭菌装置通过分时段的过滤和杀菌控制，实现低能耗高效率的空气杀毒灭菌净化效果
一种柔性可变形热流传感器及制备装置
No full text本发明公开了一种柔性可变形热流传感器，包括柔性基体，柔性基体的一端设置有引脚组，柔性基体远离引脚组的表面设置有金属测点组，引脚组通过设置在柔性基体内的导线电性连接金属测点组；其中，引脚组内相邻两个引脚通过一个导线与金属测点组内的一个金属测点串联，其制备装置包括注射成型模具以及设置在注射成型模具一侧的夹线组件；注射成型模具的内部设置有型腔，靠近型腔远离夹线组件的端部设置有金属测点成型座；注射成型模具的顶部和底部均设置有用于向型腔内进行料体注射的端口；夹线组件用于对放置在型腔中的导线进行夹持。本发明解决了复杂形面模型表面热流率测量的问题，热流传感器具有柔性基底，不仅可以使得传感器的安装更加方便，测量端面和模型表面完全重合，并且可以增加测点的密度，更加清楚地获得模型表面热流分布情况