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A folded two-degree-of-freedom piezoelectric vibration energy harvester has been proposed by several researchers including the authors. It is characterized by the reversal of the modal sequence, which enhances the electrical output power near a target operating frequency with very little eigenfrequency separation. However, no appropriate mathematical models have yet been developed, though a well-developed...
Fluid flow in small scale channel as droplet, continuous or discrete volume of liquid has been used in the multidisciplinary research field to be utilized in wide variety of applications in chemistry, biology, medical technologies. Recently, energy scavenging technique that merges the microfluidics with liquid–solid contact electrification charging from the small flows has become a new area of investigation...
In this paper, the previously proposed demanded power point tracking (DPPT) control is applied to a medium-capacity wind turbine. Based on the results of our previous studies, the control algorithm has modified to be advantageous for wind farm control and load reduction of individual wind turbines. The target turbine is a medium-capacity turbine with a rated power of 100 kW and uses direct drive-train...
A direct simulation Monte Carlo (DSMC) method is implemented on graphical processing unit (GPU) architecture to simulate the deposition phenomena that occur on a glass panel during modern organic light emitting diodes (OLED) manufacturing processes with a huge number of simulated particles because a fully three-dimensional (3D) particle simulation is required to accurately predict deposition thickness...
Nontraditional machining processes are frequently used in product manufacturing when either the material is difficult to machine, or a very precise geometry is required. Electrical discharge machining (EDM) is considered as a popular nontraditional machining process. EDM process is used to machine a diverse range of engineering materials such as hard materials, ceramics and modern composite materials...
In this study, wind-battery hybrid power systems are designed, evaluated, and optimized for regular supply of electrical power at a designated minimum load level with no shortage. Our simulation uses lead-acid batteries and vanadium redox flow batteries (VRBs) for storage, and utilizes hourly wind speed data measured in 2012 at Mt. Taegi in South Korea. Twenty Vestas V80 wind turbines, each rated...
This paper proposes a real time monitoring method of the status of flooding and drying out of a proton exchange membrane in a Polymer Electrolyte Membrane Fuel Cell (PEMFC). The PEMFC stack is modeled using the simplified Randle’s equivalent electrical circuit. The measured stack voltages after a step current consumption provides the criterion for the water balance condition in the PEMFC. The voltage...
The roll-to-roll adhesive film manufacturing process has been widely used in the field of composite film manufacture. Thus far, many research groups have reported on the variation in characteristics of pressure sensitive adhesive film according to application environment characteristics, such as temperature and external forces, failure mechanism, and structures that improve the adhesive force of the...
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