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Power electronic applications come along with very high requirements in terms of reliability. Thermal loadings stress whole electronic packages while powering the semiconductor and by environmental temperature changes. Direct copper bonding (DCB) substrates are widely used in electronic applications due to its high thermal conductivity performance. They consists of copper layers sintered onto an Al...
In the present study, the surface morphological features and nanomechanical properties of GaN and Al0.08Ga0.92N thin films are investigated by means of atomic force microscopy (AFM) and nanoindentation techniques, respectively. The GaN and Al0.08Ga0.92N thin films are deposited on c-plane sapphire substrates by using the metal-organic chemical vapor deposition (MOCVD) method. The films thickness of...
Modeling of an electrically driven fluid flow system for multi-domain simulation is reported. The electrically driven actuator force is considered by an actuator component model, based on a spring-mass-damper system with force balance formulation. The fluid flow model is developed on the basis of a Kirchhoffian network which is derived from the mass transport equation. The actuator and the fluid models...
A new modeling framework of an electrically driven fluid flow system for mixed-domain circuit simulation is reported. Coupling between electrical and fluidic domains is implemented by developing an organic actuator compact model. The actuator model is based on force balance spring-mass-damper system equation. Fluid compact model is derived from mass transport equation. The actuator and the fluid models...
This paper considers the application of a higher order sliding mode control algorithm to the problem of precision-limit positioning of a direct drive system in the presence of friction. Precision-limit positioning requires that the precision error is equal to the resolution of the sensor. Such high levels of control performance have not been generally considered possible because of the problems encountered...
The nonlinear dynamics model is established by using Newton — Euler method, and the action of wind on the airship is taken into consideration. The effect of wind on the dynamics of the airship is investigated, including the influence of steady wind on the flight trajectory, and the wind shear on the dynamic response of the airship. The optimal ascending trajectory is designed to perceive the anti-wind...
By initiating physical contact with people, robots can be more useful. For example, a robotic caregiver might make contact to provide physical assistance or facilitate communication. So as to better understand how people respond to robot-initiated touch, we conducted a 2x2 between-subjects experiment with 56 people in which a robotic nurse autonomously touched and wiped the subject's forearm. Our...
This paper describes the design and implementation of a behavior that allows a robot with a compliant arm to perform wiping motions that are involved in bed baths. A laser-based operator-selection interface enables an operator to select an area to clean, and the robot autonomously performs a wiping motion using equilibrium point control. We evaluated the performance of the system by measuring the...
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