Identification of mine blast interaction pressure on excited plates: Using transient adjoint optimization for solving the inverse problems

Mines and improvised explosive devices are the cause of many mortalities of vehicle occupants. Both experimental and numerical research in this field aims to improve the safety of military vehicles. TNO has advanced Finite Element (FE) models to simulate such events. The numerical research is done to better understand mine blasts. Another aim is...

Non-linear dynamic response of a beam using an impulse response method based on linear complex modes

The purpose of this thesis is to formulate and test a computational method, based on linear complex modes, to calculate the dynamic response of a beam with a boundary dashpot excited by a non-linear response-dependent dissipative force. This impulse response method is a time-stepping method which iteratively approximates the non-linear force by...

A Variable Stability In-Flight Simulation System using Incremental Non-Linear Dynamic Inversion

Development of a Reliable and Efficient 3D Calculation Model of a High-Rise Building Under Seismic Loading

This thesis research focusses on the development of a reliable and efficient 3D calculation model of an existing high-rise, reinforced concrete building in the Groningen area, in order to analyse the dynamic behaviour of the existing and subsequently retrofitted main bearing structure of this high-rise building. The assessment of the existing...

Characterization of non-linear compliant shell mechanisms: To enhance the design process of a compliant scoliosis brace

Compliant shell mechanisms utilize spatially curved thin-walled structures to transfer or transmit force, motion or energy through elastic deformation. To design with spatial mechanisms designers need non-linear characterization methods. This work introduces a comprehensive non-linear characterization method and framework which is experimentally...

Transition radiation in an inhomogeneous and non-linear one-dimensional system

When a source moves along a straight line with constant velocity and acts on an inhomogeneous medium, energy is radiated away from the source. This phenomenon is referred to as transition radiation. The energy radiation can also be generated by the change of velocity or path of the source (radiation in a non-uniform motion), as well as when it...

Extracting elastic properties of graphene nanodrums using a multi-modal approach in Molecular Dynamics

The field of nanotechnology has been quickly growing over the last few decades and many different functional Nano Electro Mechanical Systems(NEMS) can now be made. <br/>To further increase the possibilities and functionality of NEMS, new materials have to be characterized. Of the new materials which become available at the nanoscale, graphene is...

Damage detection in semiconductor devices by non-linear elastic wave spectroscopy

Semiconductor devices can be found everywhere in our daily lives, for example in self-driving cars, bank cards and personal devices such as smart phones or notebooks. Once part of these personal devices, one does not want them to show failure. Although reliability of such devices is taken into account in the design, the fabrication process might...

Non-Linear Time Series Analysis of Deep Groundwater Levels: An application to the Veluwe

The objective of this study is to improve the simulation of deep groundwater levels by time se- ries models with pre-defined impulse response functions. This is attempted by adding a conceptual non-linear root zone model to simulate the recharge series to the model and by testing the use of a separate response function for the percolation zone....