Exact closed-form expressions for the complete RTM correction

We present exact, closed-form expressions for the complete RTM correction and the harmonic correction to disturbing potential, gravity disturbance, gravity anomaly, and height anomaly. They need to be applied in quasi-geoid modelling whenever data points are buried inside the masses after residual terrain model (RTM) reduction and...

The RTM harmonic correction revisited

In this paper, we derive improved expressions for the harmonic correction to gravity and, for the first time, expressions for the harmonic correction to potential and height anomaly. They need to be applied at stations buried inside the masses to transform internal values into harmonically downward continued values, which are then input to...

Void formation during RTM: An experimental and analytical study on the influence of bundle porosity on void formation during liquid composite molding in woven fabrics

Mechanical air entrapment, void compression and void dissolution are the main mechanisms behind void formation in liquid composite molding. Mechanical air entrapment is induced by the highly non-uniform geometry at the meso- and micro-scale and the heterogeneous properties of the reinforcing material. This results in differences in the velocity...

Resin Transfer molding of High-Fluidity Polyamide-6 with modified Glass-Fabric preforms

In Resin Transfer Molding (RTM), resin precursors of thermoset or, more recently, thermoplastic polymers are generally employed, raising issues related to the chemical reaction taking place during and after part processing. In this study, already polymerized polyamide-6 with low melt-viscosity (~30 Pa·s at 280 °C), is injected at low pressure...

Directional Wavefield Decomposition of Snapshots of Acoustic Wavefields

In acoustic exploration and monitoring imaging plays a critical role in uncovering structure and minute changes therein. It is, however, often hampered by unfulfilled assumptions. One such assumption is that estimated incident and reflected wavefields at a reflector travel in opposite directions with respect to the reflector surface-normal...

The Prediction of Multi-scale Voids and Their Mechanical Effect on Thick Composite Structures Manufactured by RTM

Thick composite laminates can be used in aerospace and automotive industry replacing metals for weight saving.<br/>Increasing the thickness can bring more defects, like voids.<br/>This master thesis focuses on the multi-scale voids prediction and their mechanical effect simulation of thick composite laminates manufacturing by \ac{RTM}.<br/>It...

NAP to EVRS: a re-evaluation of the Dutch input and its impact on the realization of the European Vertical Reference System

Double degree of Master of Science in Applied Geophysics at Delft University of Technology, ETH Zürich and RWTH Aachen University. - In 2004, Rijkswaterstaat provided geopotential differences between the benchmarks of the Normaal Amsterdams Peil (NAP) network to the Bundesamt für Kartographie und Geodäsie (BKG) for the realization of the...

A Natural Fibre Composite Longboard

A promising alternative to glass fibre reinforced plastics are composites based on natural fibres and biobased plastics, so called Natural Fibre Composites. NPSP composites is market leader in the development and the usage of this technology. Nonetheless the material is relatively young and needs a lot of R&D. The material push asks for an eye...