EH
E.C. Hooijkamp
14 records found
1
Topology optimization for linear thermo-mechanical transient problems
Modal reduction and adjoint sensitivities
This paper focuses on topology optimization for linear transient thermo-mechanical problems. The latter are, for example, encountered for extreme precision tools and instrumentation. Due to the transient nature, a standard adjoint sensitivity analysis will result in a backward tr
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Design of transient thermo-mechanical systems is a challenging task often encountered during the design of high precision machines and instrumentation. Topology optimization can provide valuable insight during the design process, however, for large scale problems the backward tim
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A demonstrator adaptive optics-system with a thermally actuated active mirror (AM) is presented to pre-study feasibility of sub-nm wavefront control in extreme ultraviolet (EUV) lithography. The AM is thermally actuated by selective heating using a spatial controllable heat sourc
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Designing transient thermal mechanical systems is a challenging task. Material can have many different functions: it can provide heat capacity, heat conduction, mechanical stiffness or even function as an actuator. Topology optimization can provide the engineer with valuable insi
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Typically, the transient thermal error accounts for up to 70 percent of the total error in machine tools and precision devices. To decrease the effect of thermal distortions, design optimization is used as tool to modify, e.g., the material thickness, structural shape and cooling
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Reduced thermomechanical models are needed for the next generation precision devices. One of the methods is thermal modal analysis, which decomposes the behaviour into thermal modes and time constants. This study aims to measure these modal parameters. We isolated the behaviour o
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Design sensitivities are used in various engineering methods to arrive at optimal or advanced designs. The design sensitivity of a system, also known as the derivative to a design variable, represents the change of the system response due to an adjustment of a design variable. Sc
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