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排序方式: 共有267条查询结果,搜索用时 15 毫秒
51.
Thorsten Biermann Luca Scalia Changsoon Choi Holger Karl Wolfgang Kellerer 《Pervasive and Mobile Computing》2012,8(5):662-681
Coordinated Multi-Point (CoMP) transmission and reception is a promising solution for managing interference and increasing performance in future wireless cellular systems. Due to its strict requirements in terms of capacity, latency, and synchronization among cooperating Base Stations (BSs), its successful deployment depends on the capability of the mobile backhaul network infrastructure.We deal with the feasibility of CoMP transmission/reception, in particular of Joint Transmission (JT). For this, we first evaluate which cluster sizes are reasonable from the wireless point-of-view to achieve the desired performance gains. Thereafter, we analyze how different backhaul topologies (e.g., mesh and tree structures) and backhaul network technologies (e.g., layer-2 switching and single-copy multicast capabilities) can support these desired clusters. We study for different traffic scenarios and backhaul connectivity levels, which part of the desired BS clusters are actually feasible according to the backhaul characteristics. We found out that a significant mismatch exists between the desired and feasible clusters. Neglecting this mismatch causes overheads in real JT implementations, which complicates or even prevents their deployment.Based on our findings, we propose a clustering system architecture that not only includes wireless information, as done in the state of the art, but also combines wireless and backhaul network feasibility information in a smart way. This avoids unnecessary signaling and User Equipment (UE) data exchange among BSs which are not eligible to take part in the cooperative cluster. Evaluations show that our scheme reduces the signaling and UE data exchange overhead by up to 85% compared to conventional clustering approaches, which do not take into account the backhaul network’s status. 相似文献
52.
C. Himcinschi C. Biermann E. Storti B. Dietrich G. Wolf J. Kortus C.G. Aneziris 《Journal of the European Ceramic Society》2018,38(16):5580-5589
New carbon-bonded alumina filters for steel melt filtration were developed. The carbonaceous matrix was based on a new, environmental friendly binder system based on lactose and tannin. The filter preparation was analogous to the production of conventional foam filters according to the Schwartzwalder process. The processing as well as the rheology of the slurries was investigated. An addition of n-Si increased the carbon yield and the cold crushing strength (CCS) of the samples. Higher values of CCS were obtained after coating of the filters with alumina. The material was characterized by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The applicability of these new filters was assessed in impingement tests with a steel melt, in which three out of four recipes survived the thermal shock. 相似文献
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T. Hammers M. Marré J. Rautenberg P. Barreiro V. Schulze D. Biermann A. Brosius A. E. Tekkaya 《国际钢铁研究》2009,80(5):366-375
Electromagnetic compression of tubular profiles with high electrical conductivity is an innovative joining process for the manufacturing of lightweight structures. The mandrel's material has an influence on the transferable loads which is affected by the Young's modulus as well as the strength of the material. This was investigated, on the one hand, by changing the mandrel's material and, on the other hand, by using the same mandrel material with differing strength. Furthermore, taking conventional interference fits into account, the contact area's influence on the joint's quality seems to be of significance, as e.g. the contact area and the friction coefficient between the joining partners proportionally determine an allowed axial load or torsional momentum. Therefore, different contact area surfaces were prepared by shot peening and different machining operations and strategies. The mandrel's surfaces were modified by shot peening with glass beads and Al2O3 particles. An alternative preparation was performed using simultaneous five‐axis milling, because potential joining partners in lightweight frame structures within the Transregional Collaborative Research Centre SFB/TR10 would be manufactured similarly. After that, the manufactured surfaces were characterized by measuring the surface roughness and using confocal whitelight microscopy. Afterwards the modified mandrels were joined by electromagnetic compression. The influence of different mandrel's surface conditions on the joint's mechanical properties was analysed by tensile tests. Finally, conclusions and design rules for the manufacturing of joints by electromagnetic compression are given. 相似文献
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A. Al-Mukhtar H. Biermann S. Henkel P. Hübner 《Journal of Materials Engineering and Performance》2010,19(6):802-809
The investigation of fatigue strength needs an accurate solution and reliable values of the stress intensity factor (SIF).
In this study, SIF of load-carrying cruciform welded joints has been evaluated using finite element method (FEM), and compared
with the available solutions from literature. Load-carrying cruciform welded joints with isosceles triangles and non-isosceles
triangle fillet weld shapes were considered and have been analyzed by the FEM-based simulator FRANC2D program. Moreover, the
effects of plate thickness and penetration depth have been considered. The aim of this work was to study the effects of these
geometrical variables on fatigue SIF of the load-carrying welded joints with lack of penetration. The ability of FRANC2D to
find an appropriate SIF solution is shown and compared with available solutions. 相似文献
58.
In this study, an approach for using diamond grinding tools to machine holes in epoxy carbon laminates is described. The development of a suitable tool design and the influence of the cutting parameters are presented. With these tools, large total drilling lengths can be achieved without significant grain wear. Analysis of the results shows that the coolant supply can be reduced without exceeding the resin's glass transition temperature. In addition to the experimental results, a process simulation is applied to improve the tool layout and hence to avoid material clogging at the grinding layer. 相似文献
59.
F. Lehthaus M. Biermann K. Hain P. Reimers H. Kloß U. Wiesmann H. Brüggemann 《Forschung im Ingenieurwesen》1980,46(3):103-104
Ohne Zusammenfassung 相似文献
60.
本文介绍了新一代IHM.B具备更强机械性能的高功率IGBT模块,其融合了最新的设计、材料、焊接和安装技术。首批IHM.B模块将搭载最新的、采用沟槽栅单元设计的3.3kV IGBT3芯片,在保持机械兼容性的同时,极大地提高了器件的热效率和电气效率。本文还对宇宙射线以及功率循环试验进行了研究。 相似文献