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In this study, we experimentally studied the relationship between wingbeat frequency and resonant frequency of 30 individuals of eight insect species from five families: Odonata (Sympetrum flaveolum), Lepidoptera (Pieris rapae, Plusia gamma and Ochlodes), Hymenoptera (Xylocopa pubescens and Bombus rupestric), Hemiptera (Tibicen linnei) and Coleoptera (Allomyrina dichotoma). We found that wingbeat...
In this paper, a cooling system for an infrared sensor window was analyzed. We applied the same conditions used in an experiment to a numerical analysis. For the heat-fluid-structure interaction analysis, we used a commercial professional heat-fluid-structure analysis program. The results of the analysis were found to be in good agreement with those of the experiment. Under steady-state conditions,...
Thermal output is a source of large error in the thermal deformation measurement of specimens under temperature change when a strain gauge is used. In this study, the digital image correlation (DIC) method is employed to measure the full-field thermal deformation and strain of a double ring structure consisting of an inner aluminum ring and an outer titanium ring. The thermal deformation of the ring...
In recent years, there has been a lot of progress in developing Flapping-Wing Micro Air Vehicles (FW-MAVs) [1–2]. Most of them were designed for low Reynolds numbers environment (in the range of 5,000 to 10,000 [3]). Therefore, many researchers have been paying attention to principle of insect flight for potential application to improve FW-MAVs or to develop even smaller system, called Nano Air Vehicles...
Following the increasing demand of self-powered sensing devices, this paper presents a multi-functional bridge bearing built-in with a piezoelectric material. The bearing has been conceived by introducing adequately a PZT element within conventional steel pot bearing or rubber elastomeric bearing. This PZT element not only supplies the electrical power required for the operation of the embedded sensors...
We have studied a biomimetic swimmer inspired by the motility mechanisms of bacteria such as E. coli theoretically and experimentally. Even though E. coli uses one or several rotating helical filaments to swim, a single rotating helical filament swimmer is considered in this work. The performance of this swimmer was estimated by modeling the dynamics of a swimmer in viscous fluid. The model has an...
In this work, we present an insect-inspired design of a motor-driven flapping wing system that mimics beetle in terms of beetle's dimension, flapping frequency and wing kinematics. In the design, we used a combination of a Scotch yoke mechanism and a linkage system to transform the rotary motion of a motor into a large flapping motion. A passive wing rotation mechanism was implemented into the flapper...
In this paper, we develop an Intelligent Wheelchair (IW) system for the severely disabled people. The main function of our system is two-fold: 1) user intention recognition using vision technique and 2) sensor-based obstacle detection and path finding. The proposed system enable a user to control IW using his mouth shape and face movement. Furthermore, to fully guarantee user's safety, the 10 range...
In this paper, we present an approach to increase flapping frequency of a previously developed flapper actuated by lightweight piezo-composite actuator (LIPCA). This is an effort to mimic the flapping motion of Allomyrina Dichotoma of which flapping frequency is typically 30 Hz. For this purpose, the dynamic characteristic of the LIPCA and the parameter study of a four-bar linkage have been conducted...
In this work, free drop impact responses of printed circuit boards (PCBs) mounted in cellular phones has been investigated to assess their dynamic responses and investigate the effects of fastening methods. The digital image correction (DIC) method was used in order to measure a full-field deformation of PCBs during drop from a certain height. Three different fastening techniques which have point...
This paper introduces an insect-mimicking flapping-wing system, where wing rotation, wing corrugation, and wing clap of real insects have been mimicked. The flapping system is actuated by a unimorph piezoceramic actuator unlike most motor-driven flapping systems. The artificial wing is made of a thin polyethylene sheet and the wing corrugation is implemented afterward. Since the wing is assembled...
In this paper, a novel flap valve micropump with an ionic polymer-metal composite (IPMC) actuator was designed, fabricated, and experimentally characterized. A high performance multilayered IPMC based on Nafion/layered silicate and Nafion/silica nanocomposites was fabricated for the actuation section of a micropump. A key element of the micropump is the IPMC driven diaphragm. The IPMC diaphragm was...
Although piezoelectric materials such as PZT have been widely used as actuators in the field of active vibration suppression, the use of bare PZT as an actuator may cause some drawbacks such as critical breaks in the installation process, short circuits in the host material and low fatigue performance. To alleviate these problems, we developed a new actuator called a lightweight piezocomposite actuator...
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