TY - GEN A1 - Schacht, Ralph A1 - Hausdorf, Alexander A1 - Wunderle, Bernhard T1 - Feasibility and Design Study of a Frictionless Air Mover for Thermal Management of Electronics T2 - Journal of Physics: Conference Series N2 - A frictionless air mover concept will be introduced. As opposed to a piezoelectric driven fan, the air mover is based on a flexible blade whose vibration is driven by means of a magnetic field. The blade material is based on a polymer material. The paper presents the results of feasibility and an on-going comprehensive design study. The results are compared with a comparable piezoelectric fan [1, 2]. The performance of the feasibility study amounted to 65% to the piezoelectric fan. To enhance the performance, two different blade materials as well as the influence of the coil shape and value were under investigation. A further goal is to reduce the size and to investigate the influence of a cabinet. The design study results in a prototype of a size of 50 x 14 x 35 mm² incl. a cabinet. The performance could be doubled. A volume flow rate of V̊ ~14 l/min and static pressure of Ƿstat = 3 Pa could be reached. KW - firctionless cooling KW - air mover KW - miniturized fan Y1 - 2014 U6 - https://doi.org/10.1088/1742-6596/525/1/012026 SN - 1742-6596 SN - 1742-6588 VL - 525 SP - 012026 ER - TY - CHAP A1 - Schacht, Ralph A1 - Hausdorf, Alexander A1 - Wunderle, Bernhard A1 - Rzepka, Sven A1 - Michel, Bernd T1 - Efficiency optimization for a frictionless air flow blade fan – design study T2 - 14th IEEE ITHERM Conference, Orlando(Fl), USA, May 30th, 2014 N2 - This paper resumes the frictionless fan concept which was introduced at itherm 2012 [1]. This concept was based on a flexible polymer blade, the vibration of which is, as opposite to the piezoelectric driven fan principle, driven by means of a magnetic field. This type of fan can be of interest in regions where otherwise the fluid flow would be stagnant. This paper presents the results of a further in depth design study to reduce power loss and form factor as well as to optimize fan efficiency. Therefore, different blade materials and shapes, different sheet materials for the inductive stimulation as well as the influence of coil shape, value and number were under investigation. As a result, the size could be reduced by half and the efficiency could be doubled. A maximum flow rate of 14 l/min and a static pressure of 3 Pa at 240 mW fan power could be reached. KW - frictionless cooling KW - reliable air flow fan KW - thermal management KW - nearly noiseless cooling Y1 - 2014 SN - 978-1-4799-5267-0 SP - 1019 EP - 1026 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Sparr, Holger A1 - Hausdorf, Alexander A1 - Jeske, Peter A1 - Kale, Nachiket A1 - Schacht, Ralph A1 - Ziegenhorn, Matthias A1 - Zysk, Oliver T1 - ±270 VDC Aircraft Harness Structural Analysis T2 - Procedia Engineering N2 - This research focuses on the structural analysis of aircraft electrical harnesses for the 270 VDC network. A combined experimental and simulation-based approach is used, where numerical models for the harnesses are developed and experimental data are acquired for basic test cases (steady load, pendulum test, etc.) as well as for different vibration load cases. Validation of the numerical models is done using the preliminary experimental data, resulting in a mature refined model in order to simulate complex scenarios. The goal of the project is thus to develop a suite of tools that allows detailed structural analysis of the aircraft harnesses, both stand alone as well as in combination with other systems KW - ± 270 VDC KW - Aircraft electrical harness KW - Windmilling imbalance KW - Structural analysis KW - Vibration response Y1 - 2015 U6 - https://doi.org/10.1016/j.proeng.2015.08.078 SN - 1877-7058 N1 - ICSI 2015, 1st International Conference on Structural Integrity Funchal, Madeira, Portugal 1st to 4th September, 2015 VL - 114 SP - 346 EP - 353 ER -