An architecture decomposition method of pneumatic catapult system based on OPM and DSM

The architecture strategy of the Unmanned Aerial Vehicle (UAV) pneumatic launch system should continue to evolve to adapt to complex and variable operating environments. Architecture representation, decomposition perspective, and cluster analysis play a vital role in the early phase of system architecture development. In order for the system to emerge anticipated and desirable intrinsic functional properties, an architecture decomposition method based on the Object-Process Methodology (OPM) and Design Structure Matrix (DSM) is put forward in this paper. The OPM is proposed to model the UAV launch process formally, and the matrix representation of the architecture of the pneumatic launch system is established. After the extension of the definition and operations of DSM, with the Idicula-Gutierrez-Thebeau Algorithm plus (IGTA + ) clustering algorithm, the transformation of the pneumatic launch system architecture from process decomposition to function decomposition is demonstrated in this paper. The analysis shows that the architecture decomposition of the pneumatic launch system meets the functional requirements of stakeholders.     

基于模态发生器的进气道风扇噪声及声衬降噪实验

为研究发动机进气道风扇噪声特性及声衬降噪效果,使用模态发生器提供声源,采用固定麦克风阵列和旋转扫描耙装置测量进气道内噪声信号,进而利用周向和径向模态分解方法得到声模态幅值,对影响模态分解结果的关键因素进行了研究.对周向模态在时域内进行分解,得到幅值和相位的时变特性.最后完成了2套声衬实验件降噪效果测试.结果表明:模态发...     

基于ICA包络增强MEMD的滚动轴承故障诊断

针对多元经验模态分解(MEMD)存在模态混叠、带内噪声干扰导致轴承故障特征信息微弱难提取问题,提出了基于独立分量分析(ICA)包络增强MEMD的滚动轴承故障诊断.采用MEMD对多通道信号进行自适应分解,依据峭度和相关系数选取包含故障信息的本征模态函数(1MF);对所选取IMF分量的包络信号进行ICA分析,抑制模态混叠和...