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This article assesses the potential benefits of transient energy storage for a hybrid regional aircraft. The mission profile of a reference aircraft is analyzed according to energetic intermittence and the results are compared to typical figures for cars, trains, and ships. Also, the opportunity of recovering energy in descent and during landing is studied. This article shows that energy saving potential...
Contamination and oxidation are inevitable in contact surfaces, especially for micro contact under low load (µN-mN). They are considered as major causes for a high contact resistance, and can lead to the failure of a contact. However, as the film formation is a complex phenomenon, it is difficult to accurately observe and characterize the film properties. In this paper, a finite element model of nickel...
Precise prediction of electrical contact resistance is important for microswitches. The contact spot used to be considered as a circle in earlier literature, where there was only one geometrical parameter: the radius of the a-spots. However, a real contact asperity has a height and an angle with the interface. In this paper, a 3-dimensional cone-truncated geometry is used to model an asperity, and...
Rough surface contact is difficult to model effectively due to multiple scales of detail that need to be considered. This work presents the results of a multiscale rough surface contact model in comparison to a finite element based deterministic model for the electrical contact of a MEMS microswitch. The real area of contact and electrical contact resistance are predicted and compared as a function...
Finite element method (FEM) is used to model ohmic contact in microswitches. A determinist approach is adopted, including atomic force microscope (AFM) scanning real contact surfaces and generating rough surfaces with three-dimensional mesh. FE frictionless models are set up with the elastoplastic material and the simulations are performed with a loading-unloading cycle. Two material properties, gold...
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