某型机械滤波器失效分析和对策

某型导弹接收机在进行温度循环高温试验时发生故障,经过排查定位为所使用的机械滤波器失效,即滤波器高温时输出端绝缘电阻降低。该文通过对机械滤波器封装结构、工艺制造流程等方面进行分析,得出机械滤波器的失效原因,并通过有效措施控制该器件失效问题再次发生,有效提高了该器件质量的可靠性。     

基于机械倾斜方式的过顶跟踪算法

首先推导了卫星过顶时盲区的计算公式,然后给出了实施机械倾斜过顶跟踪时,基于TILT A'-E'型三轴座架的倾斜范围的选取方法和倾斜轴方向的确定途径。经实际工程验证,这种倾斜范围的选取方法和倾斜轴方向的确定途径是合理、可行的。     

大功率超声波压电换能材料的研究

介绍了大功率超声波压电换能材料在工业及国防上的主要应用。通过对传统压电陶瓷工艺在某些工序的改进,如二次细磨的湿式化及通过四元系压电陶瓷配方的优化发现可制备出高居里温度(TC=330℃)大功率超声压电陶瓷换能器材料,测得其压电常数(d33)可达350,机械品质因数1 200,机电耦合系数(kp)为0.6,同时具有良好的一致性、机械强度和抗冲击能力。     

AutoCAD机械制图教学内容探索

文章探讨了AutoCAD机械制图的教学内容:首先介绍计算机绘图的基本知识,然后介绍在AutoCAD如何设置绘制符合国家标准的机械制图绘图环境,即样板文件的设置,再介绍二维图形的常用绘图方法与编辑方法、剖面线的打法、尺寸标注、零件图与装配图的绘制、生成三维图的方法和图纸的输出等。     

Photonic Vitrimer Elastomer with Self-Healing,High Toughness,Mechanochromism, and Excellent Durability based on Dynamic Covalent Bond

Vitrimers, with their unique dynamic covalent bonds, possess attractive self-healability and mechanical robustness, providing an intriguing opportunity to construct functional soft materials. However, their potential for function recovery, especially optical function, is underexplored. Harnessing the synergistic effect of photonic crystals and vitrimers, a novel photonic vitrimer with light regulating and self-healing capabilities is presented. The resulting photonic vitrimer exhibits a large tensile strain (>1000%), high toughness (21.2 kJ m⁻³), bright structural color, and mechanochromism. Notably, the structural color remains constant even after 10 000 stretching/releasing cycles, showing superior mechanical stability, creep-resistance, and excellent durability. More importantly, the exchange of dynamic covalent bonds imparts the photonic vitrimer with a self-healing ability (>95% efficiency), enabling the recovery of its optical function. Benefiting from the above merits, the photonic vitrimer has been successfully used as a sensor for human motion detection, which demonstrates visualized interactive sensibility even after self-repairing. This material design provides a general strategy for optical functionalization of vitrimers. The photonic vitrimer elastomers present great potential as resilient functional soft materials for diverse flexible devices and a novel optical platform for soft robotics, smart wearable devices, and human-machine interaction.     

普硅水泥在彩色混凝土中应用及颜料最优掺量研究

针对普通水泥混凝土外观色彩单调、灰暗,无法满足市场对混凝土装饰应用需求的缺点,研发性能优良的彩色混凝土.使用普硅水泥进行混凝土配制,观察确定混凝土着色,解决兰州白水泥短缺而无法配制高效彩色混凝土的问题,对彩色混凝土配合比进行优化,通过4种氧化铁掺量设计出着色好、抗压强度高及耐久性优良的彩色混凝土,确定了合理的颜料掺量范...     

大型喷浆机器人机械结构研究

介绍了大型喷浆机器人的机械结构和功能。并阐述了大型喷浆机器人的使用情况 ,实践证明 ,该机械人机构结构设计合理、简单 ,操作方便 ,易于维修 ,可靠性高     

强流离子注入均匀性控制

本文讨论了强流离子注入机的全机械扫描靶室中实现剂量高均匀性和高重复性注入的变速扫描设计原理及控制技术。     

Adhesional shear strength and surface analysis of a PV module deployed in harsh coastal climate

Adhesional shear strength and chemical composition at the Si/EVA interface of samples extracted from a PV module manufactured by a major manufacturer using slow-cure EVA and deployed in the hot and humid climate at Cocoa, FL were studied. Precipitation of sodium from glass superstrate and ambient, and phosphorous from dopant glass reduced adhesional strength at Si/EVA interface to 35% of that in new modules. Presence of tin at this interface has also been attributed to solder-bond corrosion by moisture and impurities Na and P. It is interesting to point out that in this case, corrosion has occurred prior to delamination.     

一种高效、安全型工业雷管激光编码线的研发

为解决原有雷管激光编码机控制系统落后,机械动作部分气缸多、动作多,以及爆炸后编码台不能泄爆的缺陷,通过改进PLC程序控制部分、机械动作部分、安全防护设计等,研制出结构简单、成本低廉、能有效提高生产安全性和产品质量可靠性,并大幅度提高编码生产效率的雷管激光编码线。