Results 1 - 10 of 440
Results 1 - 10 of 440. Search took: 0.021 seconds
|Sort by: date | relevance|
[en] All the spacecraft subsystems must be exhaustively tested before launch in order to obtain space-worthy solutions. The aim of this paper is to perform several qualification tests for increasing the Technology Readiness Level (TRL) of a Commercial Off-The-Shelf (COTS) solar cell protection diode. For accomplishing the tests, we undertake the design and manufacturing of a Thermal Vacuum (TVAC) Chamber able to reach extremely low temperatures and to deal with High Vacuum (HV) conditions. This testing facility system will be able to recreate space conditions and to perform aerospace tests. (Author)
[en] The aim of this paper is to propose an aerospace project, in order to allow Master’s Space students to put in practice their knowledge in physics, which can be crucial in this engineering area. Here, we face the attitude control issue of a cubesat, using a physical 1U satellite model and a magnetic field simulator, combined with real data from a desired orbit. The satellite model will use magnetorquers controlled by an Arduino board, in the same way as the magnetic simulator. (Author)
[en] Downward trend in laser technology price and increase of the accuracy achieved has allowed it to acquire a new dimension in recent times. This paper proposes, with a practical approach, focusing on the RF field, the use of an innovative low cost laser technology as part of the practical syllabus of an Advanced Electronics Prototyping Techniques course or similar. It provides with conceptual understanding on industrial manufacturing limitations while studying different materials engraving, professional software suites and PCB Exposure, in contrast with the expensive CNC milling methods typically used, an alternative cheaper laser engraving technique for RF is exposed.”. (Author)
[en] The First International conference on Recent Advances in Aerospace Engineering (ICRAAE-2017) will be conducted by the Department of Aerospace Engineering at the Karunya University, Coimbatore, Tamilnadu, India, on 3rd and 4th March, 2017. The conference aims to bring together students, academicians, leading scientists, researchers and industrialists working in the diverse fields of Aerospace Engineering. This conference provides an inter-disciplinary platform for the educators, researchers and practitioners to present, share and discuss the recent trends, innovations, concerns and solutions in the cutting edge technologies of Aerospace Engineering for mutual benefit and the growth of the nation. List of Major Themes, Sub Themes and Committee Members are available in this PDF. (paper)
[en] Many industries that are engaged in potentially hazardous endeavours involve systems that consist of a complex array of subsystems that must work together effectively in order for the entire system to perform successfully. To the extent the subsystems are coupled, changes in any one subsystem can affect some or all of the other subsystems. The US commercial aviation industry, in its continuing endeavour to improve safety, is using a collaborative approach to accomplish ‘system think’ — an awareness of the impacts throughout a system of changes in any of its subsystems. The industry accomplished system think by bringing all of the key parts of the industry together to work in a collaborative manner to identify and address potential safety concerns. The collaborative approach resulted in a reduction of 83% in the US commercial aviation fatal accident rate in only ten years. It also demonstrated that, contrary to conventional wisdom, safety improvements usually undermine productivity, while safety improvements that result from a collaborative approach can simultaneously improve productivity. The purpose of the paper is to help other industries that are engaged in potentially hazardous endeavours determine whether a collaborative approach might help them manage their safety risks more efficiently and effectively. (author)
[en] 'Call the AV-Photo folks and get someone in here to shoot b-roll. We'll never be able to accommodate the network cameras and the only way I can get this to the media is to produce it ourselves'. Eliot Brenner, Director NRC Office of Public Affairs, March 12, 2011. For the past four years we have been speaking to audiences at Waste Management about communications issues. Last year, though we were kept from attending because of the federal budget crisis, our surrogates described to you the lessons the nuclear industry should draw from the BP Gulf oil spill crisis. Those remarks were delivered 11 days before the Fukushima Daiichi tragedy became the nuclear landmark of a generation - an industry changing event with worldwide ramifications, both in science and regulation and in communications. Eliot Brenner cut his teeth on crisis communication in the aviation industry where tragedy unfolds rapidly. He has been a speech-writer to three cabinet secretaries, spokesman for the Federal Aviation Administration and now spokesman for the Nuclear Regulatory Commission since 2004. Holly Harrington manages the NRC crisis response program and has 26 years federal public affairs experience, including eight years at the Federal Emergency Management Agency. Her crisis experience includes the 1989 Loma Prieta earthquake, numerous hurricanes and floods, Sept 11, and, now Fukushima Daiichi. Rebecca Schmidt is a veteran government relations professional whose decades in Washington include service with the House Armed Services Committee, the House Budget Committee and the Secretary of Defense. Collectively, the Offices of Public Affairs and Congressional Affairs conducted the largest outreach for the agency since Three Mile Island. We worked with the basic rule, described to Waste Management last year just 11 days before Fukushima - communicate early, often and clearly. The response - while not without its problems and lessons - went as smoothly as a chaotic event like Fukushima could go. That was due in large measure to the fact that the NRC has a well-tested system of responding to nuclear emergencies, and we followed our plan. (authors)
[en] Variation propagation control is one of the procedures used to determine product quality in the manufacturing assembly process. The quality of a product assembly is also greatly dependent on the product type and the optimization criteria employed in the assembly. This paper presents three procedures for optimizing the assembly of component stacks by controlling variation propagation. The procedures considered are: (i) straight-build assembly by minimizing the distances from the centres of components to table axis; (ii) parallelism-build assembly by minimizing the angular errors between actual and nominal planes; (iii) target-axis-build assembly by minimizing the distances from the centres of components to a target axis. Simulation results are presented for the assembly of four cylindrical components. The results show that the variation can be reduced significantly by optimization; for example, Procedure 1 can reduce the variation by 48%, Procedure 2 by 63% and Procedure 3 by 35%, compared to assembly without the minimization. The results also show that the 3 proposed assembly methods have reasonable consistency, the maximum of the standard deviation is 0.0726 mm in Procedure 1, 3.5×10−4 rad in Procedure 2, and 0.029 mm in Procedure 3. These demonstrate that the three assembly techniques are fully functional on their own. Thus, the relevant assembly techniques need to be selected carefully in accordance with the particular industrial application.
[en] Vacuum clamping is extensively used in shell machining. In this paper a Bingham Sealing (BS) is presented and formulized based on Bingham plastic performance. The sealing capability of BS is evaluated in various cases. A new Bingham plastic is developed and the yield stress is measured. The performances of Oring sealing and BS with the developed Bingham plastic are compared to the static experiment. In this experiment the same vacuum is achieved and the distortion of the blade with BS is better than that with 'O' ring sealing.
[en] To utilize lead zirconate titanate (PZT) vibrators in the aerospace industry, we formulate the changes in the characteristics of the vibrator for the transverse mode and the thickness mode as functions of the temperature. For practical use, we adopted a few linear functions and a square function as regression functions in order to estimate the characteristics of the commercialized PZT- 5 series of ceramics. The input admittance characteristics were calculated using the characteristic functions suggested in this study, and the results showed good agreement with the measured ones.