The hierarchical fault diagnosis and health monitoring is implemented by an ensemble deep leaning method, that is, by the ssGAN-CNN model for the fatal, major, and recoverable faults in the hybrid power generation system, The hybrid power generation system is composed of the ammonia-based hydrogen source (AHS), the proton exchange membrane fuel cell (PEMFC) and ammonia-hydrogen fueled internal combustion engine (AHICE). The health monitoring result shows that when the various faults appear in the AHS-PEMFC subsystem, the AHS-AHICE subsystem, and the hybrid power generation system. The hydrogen production and the power output are both significantly reduced by these faults such as the under-heating, catalyst deactivation, membrane degradation, and so forth, such that it is essential to identify these faults. The hierarchical fault diagnosis shows that when the fatal, major, and recoverable faults appear in different systems, the average diagnostic accuracy is 97.06% for the AHS-PEMFC subsystem, 96.02% for the AHS-AHICE subsystem, and 95.18% for the AHS-PEMFC-AHICE hybrid power generation system. Consequently the trained ssGAN-CNN model effectively identifies the complex fault scenarios and addresses the challenge that supervised models face with limited labeled data.
This is a summary of the 2015 Space Cryogenics Workshop that was held in Phoenix, Arizona, June 24 to 26, 2015. The workshop was organized by David Plachta and Jason Hartwig of the Cryogenics and Fluid Systems Branch at NASA Glenn Research Center, and continued the tradition of bringing together specialists in the field of space cryogenics to discuss upcoming and potential space missions, and the development of technologies that support or-more often-are enabling for the science and exploration goals of the world's space agencies. The workshop consisted of two days of talks and poster sessions, and provided ample opportunity for more informal discussions that foster collaborations and cooperation in the space cryogenics community. Selected papers from the workshop are published in a special issue of Cryogenics, which is expected to be published by the end of 2015.
As the large demand for cryogenic horizontal storage tank at home and abroad, development and improvement of cryogenic horizontal tank design and construction technology has been imperative. LNG as a new clean energy, along with the advance of its liquefaction technology, the cost of liquefaction is greatly reduced compared with before. Improving the competitiveness of LNG and can be widely use. The article mainly introduces the basic knowledge of cryogenic horizontal tank, including design, construction and transportation.
