Engineering Composite Structure Optimization Design Method

The design ability of composite structures brings large-scale design variables, which makes it difficult to optimize structures by traditional methods, the optimization design of composite laminates is also one of the key problems. From the perspective of engineering design, multiple models are arranged for laying optimization, based on the design of composite super-ply variable definition, considering the overall engineering design constraints to sizing optimization, automatic strength checking process with the laying sequence library to optimize the laying sequence, forming a set of optimization design method of composite structure with three levels of laying optimization, initial size optimization and detailed laying optimization. Taking the structural design of composite vertical tail box of an aircraft as an example, this method is used to optimize the design of composite vertical tail box. The results show that: the three-level optimization design method proposed in this paper is a general method applicable to the optimization design of aeronautical composite structures. It reduces the weight of the structure and shortens the development cycle

Discrepancy Study of the Chemical Constituents of Panax Ginseng from Different Growth Environments with UPLC-MS-Based Metabolomics Strategy

Panax ginseng (P. ginseng), the dried root and rhizome of P. ginseng C. A. Meyer, is widely used in many fields as dietary supplements and medicine. To characterize the chemical constituents in P. ginseng cultivated in different growth environments, a UPLC-TOF-MS method was established for qualitative analysis. Four hundred and eight ginsenosides, including 81 new compounds, were characterized in P. ginseng from different regions. Among the detected compounds, 361 ginsenosides were recognized in P. ginseng cultivated in the region of Monsoon Climate of Medium Latitudes, possessing the largest amount of ginsenosides in all samples. Furthermore, 41 ginsenosides in 12 batches of P. ginsengs were quantified with a UPLC-MRM-MS method, and P. ginsengs from different regions were distinguished via chemometric analysis. This study showed that the different environments have a greater influence on P. ginseng, which laid a foundation for further quality control of the herb