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Darmstadt, Germany

Schneider S.,Bundeswehr Research Institute for Materials | Holzmann K.,Fludicon GmbH | Ulrich S.,Helmut Schmidt University
Journal of Physics: Conference Series | Year: 2013

Intensive research, project development, and success in industrial applications based on electrorheological (ER) technology lead to considerations to develop standardized methods to characterize ER suspensions. Some independent work was completed in earlier projects and in 2006 a working group was founded in Germany consisting of seven different partners. In April 2011, the first part of DIN 51480 was issued addressing "Electrorheological suspensions-Requirements, testing and application-Part 1: Basics and field strength independent properties". In the future, two additional parts are planned to be released. Part 2 will describe methods to determine field strength dependent properties under laboratory conditions. Part 3 will describe methods to determine field strength dependent properties under application-like conditions. The majority of the work has already been completed for the development of Parts 2 and 3. However, some efforts still need to be completed before these two parts can be released. © Published under licence by IOP Publishing Ltd.


Goldasz J.,BWI Group | Alexandridis A.A.,Fludicon GmbH
JVC/Journal of Vibration and Control | Year: 2012

Controllable dampers based on smart fluids contain internal passages through which the working fluid flows and wherein the controlled pressure drop occurs under the influence of magnetic or electric fields. In this paper, the dynamics of such dampers are analysed through a series of theoretical dynamic models of increasing detail and complexity. The models capture the medium- and high-frequency dynamics of the damping force output of the damper and include the lumped mass of the fluid contained in the internal flow passages, the piston and rod assembly mass, and the compressibility of the fluid and pressurized gas contained within the chambers of the damper. The models are derived in state-space form from which transfer functions and natural frequencies are obtained analytically and then calculated for each of the systems. The results are presented in the form of frequency responses (Bode plots). Finally, the effects of the key geometric parameters of the damper and of the relevant fluid properties on the damper force output dynamics are presented and discussed. © The Author(s) 2011 Reprints and permissions: sagepub.co.uk/ journalsPermissions.nav.


Patent
Fludicon GmbH | Date: 2013-03-11

The present invention relates to an electrorheological composition with corrosion-inhibiting properties, methods for the production thereof and the use thereof.


Gurka M.,Fludicon GmbH | Gurka M.,ERF Produktion Wurzburg GmbH | Johnston L.,Fludicon GmbH | Petricevic R.,ERF Produktion Wurzburg GmbH
Journal of Intelligent Material Systems and Structures | Year: 2010

Various applications for controllable dampers in the industrial and automotive sector are demanding an improved electrorheological (ER)-fluid, concerning performance and long-term behavior. The newly developed ER-fluid RheOil 3.0 presented here overcomes the main disadvantages like sedimentation and re-dispersing behavior. Besides this, better ER-performance (control ratio, current-density, step response time) could also be achieved. During tests of the response to changing temperature and long-term behavior, no significant degradation of the fluid or abrasive wear in the components was found over a wide temperature range. © 2010 The Author(s).


Kemmetmuller W.,Vienna University of Technology | Holzmann K.,Vienna University of Technology | Holzmann K.,Fludicon GmbH | Kugi A.,Vienna University of Technology | Stork M.,Fludicon GmbH
IEEE/ASME Transactions on Mechatronics | Year: 2013

This paper presents a semiactive shock absorber system, which utilizes the special properties of electrorheological (ER) valves and which is intended to protect sensitive equipment on ships or submarines. It consists of a platform and a base plate, which are connected via an ER damper and an air spring. The resulting acceleration of the platform upon an external shock of the base plate should be significantly reduced while assuring fast and accurate repositioning of the platform after the shock. A control strategy is discussed, which fulfills these requirements using only one acceleration sensor. Simulation studies and measurement results on a prototype prove the feasibility of the proposed system. © 1996-2012 IEEE.

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