基于光学自准直原理的喷管角度偏差测量方法研究

提出了一种基于光学自淮直原理的喷管角度偏差测量方法，通过专用靶标将庭拟的喷管轴线等效替代为靶标轴端反光镜的法线，实现发动机喷管基淮孔轴线空间角度偏差的快速准确、实时測量，及时提供测量数据,有效保证零件、部件和发动机总装的质量一致性和可 靠性。利用该方法研制了一套发动机多喷管轴线角度偏差自动测量装置并进行了试验验证，结果表明该装置测量精度与三坐标表测量机的测量精度按近,符合测量误差分析,满足使用要求。

Experimental and Simulation Study of Wind Induced Based Piezoelectric Generator

With the development of low-power MEMS device, more and more micro-generators have emerged, of which piezoelectric generators are typical representatives. This paper intends to conduct experimental and simulation study on Wind Induced Based Piezoelectric Cantilevers. The main contents include two parts. First, establishing fluid-structure interaction simulation model and analyzing mechanical environment and flutter mechanism of flexible beam submerged in axial flow. Second, investigating the voltage output characteristics of piezoelectric cantilever under the conditions of subcritical flutter velocity and supercritical flutter velocity. The output voltage and the charging performance under the conditions of subcritical and supercritical flutter velocity are explored. The results show that the peak output voltage is approximately 20V under the conditions of supercritical flutter velocity and close to zero under the conditions of subcritical flutter velocity. A single piezoelectric cantilever can charge a 10μF capacitor up to 22V in 10s. This paper illustrates the possibility of charging low-power MEMS devices with Micro-piezoelectric generators.