Dr. Hans Peter Monner Profile

Dr. Hans Peter Monner

Doctor at Deutsches Zentrum für Luft- und Raumfahrt eV

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Publications (14)

Proceedings Article | 19 May 2020 Paper

Numerical investigation towards the control of flexural waves using structural intensity for an active barrier of structure-borne sound

Alexander Kokott, Hans Peter Monner, Thomas Haase

Proceedings Volume 11376, 1137623 (2020) https://doi.org/10.1117/12.2558100

KEYWORDS: Sensors, Control systems, Active vibration control, Wave plates

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Proceedings Article | 11 April 2017 Presentation + Paper

Acoustic design of boundary segments in aircraft fuselages using topology optimization and a specialized acoustic pressure function

Martin Radestock, Michael Rose, Hans Peter Monner

Proceedings Volume 10164, 101640Q (2017) https://doi.org/10.1117/12.2259952

KEYWORDS: Acoustics, Optimization (mathematics), Systems modeling, Finite element methods, Partial differential equations, Signal processing, Control systems, System integration, Chemical elements, MATLAB, Solids, Aluminum, Matrices, Data modeling

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Proceedings Article | 20 April 2016 Presentation + Paper

Experimental and finite element analyses of multifunctional skins for morphing wing applications

Sebastian Geier, Markus Kintscher, Thorsten Mahrholz, Peter Wierach, Hans-Peter Monner, Martin Wiedemann

Proceedings Volume 9803, 980328 (2016) https://doi.org/10.1117/12.2219357

KEYWORDS: Composites, Skin, Nose, Aerodynamics, Manufacturing, Glasses, Carbon, Metals, Kinematics, Integration

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As a consequence of operational eﬃciency because of rising energy costs, future transport systems need to be mission-adaptive. Especially in aircraft design the limits of lightweight construction, reduced aerodynamic drag and optimized propulsion are pushed further and further. The ﬁrst two aspects can be addressed by using a morphing leading edge. Great economic advantages can be expected as a result of gapless surfaces which feature longer areas of laminar ﬂow. Instead of focusing on the kinematics, which are already published in a great number of varieties, this paper emphasizes as major challenge, the qualiﬁcation of a multi-material layup which meets the compromise of needed stiﬀness, ﬂexibility and essential functions to match the ﬂight worthiness requirements, such as erosion shielding, impact safety, lighting protection and de-icing. It is the aim to develop an gapless leading edge device and to prepare the path for higher technology readiness levels resulting in an airborne application. During several national and European projects the DLR developed a gapless smart droop nose concept, which functionality was successfully demonstrated using a two-dimensional 5 m in span prototype in low speed (up to 50 m/s) wind tunnel tests. The basic structure is made of commercially available and certiﬁed glass-ﬁber reinforced plastics (GFRP, Hexcel Hexply 913). This paper presents 4-point bending tests to characterize the composite with its integrated functions. The integrity and aging/fatigue issues of diﬀerent material combinations are analyzed by experiments. It can be demonstrated that only by adding functional layers the mentioned requirements such as erosion-shielding or de-icing can be satisﬁed. The total thickness of the composite skin increases by more than 100 % when required functions are integrated as additional layers. This fact has a tremendous impact on the maximum strain of the outer surface if it features a complete monolithic build-up. Based on experimental results a numerical model can be set up for further structural optimizaton of the multi-functional laminate.

Proceedings Article | 15 April 2016 Presentation + Paper

Lessons learned from wind tunnel testing of a droop-nose morphing wingtip

Srinivas Vasista, Johannes Riemenschneider, Bram van de Kamp, Hans Peter Monner, Ronald C. Cheung, Christopher Wales, Jonathan Cooper

Proceedings Volume 9799, 979929 (2016) https://doi.org/10.1117/12.2219163

KEYWORDS: Wind measurement, Design for manufacturability, Manufacturing, Composites, Actuators, Structural design, Aerodynamics, Finite element methods, Optimization (mathematics), 3D acquisition

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Proceedings Article | 2 April 2015 Paper

Static and quasi-static behavior of an adaptive system to compensate path errors for smart fiber placement

M. Perner, H. P. Monner, C. Krombholz, F. Kruse

Proceedings Volume 9431, 94311B (2015) https://doi.org/10.1117/12.2083198

KEYWORDS: Actuators, Structured optical fibers, Composites, Manufacturing, Control systems, Aluminum, Head, Sensors, Aerospace engineering, System integration

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Proceedings Article | 10 April 2013 Paper

Characterization of multifunctional skin-material for morphing leading-edge applications

Sebastian Geier, Markus Kintscher, Thorsten Mahrholz, Peter Wierach, Hans-Peter Monner, Martin Wiedemann

Proceedings Volume 8688, 868818 (2013) https://doi.org/10.1117/12.2009865

KEYWORDS: Metals, Adhesives, Skin, Interfaces, Aerodynamics, Glasses, Manufacturing, Failure analysis, Composites, Kinematics

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Proceedings Article | 28 March 2012 Paper

Material characterization for morphing purposes in order to match flight requirements

Sebastian Geier, Markus Kintscher, Olaf Heintze, Peter Wierach, Hans-Peter Monner, Martin Wiedemann

Proceedings Volume 8341, 834113 (2012) https://doi.org/10.1117/12.915240

KEYWORDS: Composites, Nose, Skin, Metals, Aerodynamics, Manufacturing, Material characterization, Aerospace engineering, Interfaces, Climatology

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Natural laminar flow is one of the challenging aims of the current aerospace research. Main reasons for the aerodynamic transition from laminar into turbulent flow focusing on the airfoil-structure is the aerodynamic shape and the surface roughness. The Institute of Composite Structures and Adaptive Systems at the German Aerospace Center in Braunschweig works on the optimization of the aerodynamic-loaded structure of future aircrafts in order to increase their efficiency. Providing wing structures suited for natural laminar flow is a step towards this goal. Regarding natural laminar flow, the structural design of the leading edge of a wing is of special interest. An approach for a gap-less leading edge was developed to provide a gap- and step-less high quality surface suited for natural laminar flow and to reduce slat noise. In a national project the first generation of the 3D full scale demonstrator was successfully tested in 2010. The prototype consists of several new technologies, opening up the issue of matching the long and challenging list of airworthiness requirements simultaneously. Therefore the developed composite structure was intensively tested for further modifications according to meet requirements for abrasion, impact and deicing basically. The former presented structure consists completely of glass-fiber-prepreg (GFRP-prepreg). New functions required the addition of a new material-mix, which has to fit into the manufacturing-chain of the composite structure. In addition the hybrid composites have to withstand high loadings, high bending-induced strains (1%) and environmentally influenced aging. Moreover hot-wet cycling tests are carried out for the basic GFRP-structure in order to simulate the long term behavior of the material under extrem conditions. The presented paper shows results of four-points-bending-tests of the most critical section of the morphing leading edge device. Different composite-hybrids are built up and processed. An experimental based trend towards an optimized material design will be shown.

Proceedings Article | 12 April 2010 Paper

Configuration of a shear web based actuation system

Franz Josef Natterer, Hans-Peter Monner

Proceedings Volume 7643, 764329 (2010) https://doi.org/10.1117/12.846350

KEYWORDS: Actuators, Ceramics, Composites, Smart materials, Structured optical fibers, Microsoft Foundation Class Library, Skin, Aerodynamics, Polarization, Aircraft structures

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Proceedings Article | 6 April 2009 Paper

Solid electroytes for CNT-based actuators

Johannes Riemenschneider, Sebastian Geier, Thorsten Mahrholz, Jürgen Mosch, Hans Peter Monner, Michael Sinapius

Proceedings Volume 7287, 728713 (2009) https://doi.org/10.1117/12.815451

KEYWORDS: Actuators, Solids, Electrodes, Liquids, Resistance, Carbon nanotubes, Manufacturing, Raw materials, Capacitors, Ions

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Actuators based on carbon nanotubes (CNT) have the potential to generate high forces at very low voltages. The density of the raw material is just 1330 kg/m3, which makes them well applicable for lightweight applications. Moreover, active strains of up to 1% can be achieved - due to the CNTs dimensional changes on charge injection. Therefore the nanotubes have to be arranged and electrically wired like electrodes of a capacitor. In previous works the system's response of the Nanotubes comprising a liquid electrolyte was studied in detail. The major challenge is to repeat such experiments with solid electrolytes, which is a prerequisite for structural integration. In this paper a method is proposed which makes sure the expansion is not based on thermal expansion. This is done by analysing the electrical system response. As thermal expansion is dominated by ohmic resistance the CNT based actuators show a strong capacitive behavior. This behavior is referable to the constitution of the electrochemical double layer around the nanotubes, which causes the tubes to expand. Also a novel test setup is described, which guarantees that the displacement which is measured will not be caused by bending of a bimorph but due to expansion of a single layer of nanotubes. This paper also presents experimental results demonstrating both, the method of electrical characterization of CNT based actuators with implemented solid electrolytes and the novel test setup which is used to measure the needed data. The actuators which were characterized are hybrids of CNT and the solid electrolyte NAFION which is supplying the ions needed to constitute the electrochemical double layer. The manufacturing, processing of these actuators and also some first experimental results are shown. Unfortunately, the results are not as clear as those for liquid electrolytes, which depend on the hybrid character of the analyzed devices. In the liquid electrolyte based case the CNTs are the only source of stiffness, whereas in the solid electrolyte case electrodes and electrolyte contribute to the overall stiffness and damping as well. Since the introduction of solid electrolytes is a major stumbling block in the development of such actuators, this work is of particular importance.

Proceedings Article | 13 August 2003 Paper

Carbon nanotubes as actuators in smart structures

Hans Monner, Stefan Muehle, Peter Wierach

Proceedings Volume 5053, (2003) https://doi.org/10.1117/12.484194

KEYWORDS: Actuators, Carbon nanotubes, Single walled carbon nanotubes, Carbon, Smart structures, Manufacturing, Chemical vapor deposition, Mechanics, Chemical species, Electrodes

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Proceedings Article | 9 July 2002 Paper

New results and future plans of the German major project ADAPTRONICS

Hans Monner, Holger Hanselka, Elmar Breitbach

Proceedings Volume 4698, (2002) https://doi.org/10.1117/12.475078

KEYWORDS: Prototyping, Manufacturing, Actuators, Ferroelectric materials, Sensors, Ultrasonics, Composites, Transducers, Reflectors, Control systems

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Proceedings Article | 9 July 2002 Paper

Application specific design of adaptive structures with piezoceramic patch actuators

Peter Wierach, Hans Monner, Andreas Schoenecker, Johannes Duerr

Proceedings Volume 4698, (2002) https://doi.org/10.1117/12.475080

KEYWORDS: Semiconducting wafers, Manufacturing, Actuators, Electrodes, Ceramics, Chemical elements, Mirrors, Sensors, Data modeling, Satellites

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Proceedings Article | 9 July 2002 Paper

Adaptronics in airliner design: a new structural approach

Christian Anhalt, Elmar Breitbach, Hans Monner

Proceedings Volume 4698, (2002) https://doi.org/10.1117/12.475084

KEYWORDS: Actuators, Shape memory alloys, Skin, Aerodynamics, Interfaces, Aerospace engineering, Finite element methods, Structural design, Mechanics, Structured optical fibers

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Proceedings Article | 16 June 1998 Paper

Development and design of flexible Fowler flaps for an adaptive wing

Hans Monner, Holger Hanselka, Elmar Breitbach

Proceedings Volume 3326, (1998) https://doi.org/10.1117/12.310673

KEYWORDS: Skin, Aerodynamics, Kinematics, Chemical elements, Image segmentation, Actuators, Aerospace engineering, Mechanics, Manufacturing, Control systems

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Showing 5 of 14 publications

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