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Development of a Peristaltic Micropump for Bio-Medical Applications Based on Mini LIPCA

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Journal of Bionic Engineering 2008年第2期5卷 135-141页

作者： Thanh Tung Nguyen My Pham nam seo goo Department of Aerospace Engineering Konkuk University Department of Advanced Technology Fusion Konkuk University

This paper presents the design, fabrication, and experimental characterization of a peristaltic micropump. The micropump is composed of two layers fabricated from Polydimethylsiloxane （PDMS） material. The first layer has a rectangular channel and two valve seals. Three rectangular mini lightweight piezo-composite actuators are integrated in the second layer, and used as actuation parts. Two layers are bonded, and covered by two Polymethyl Methacrylate （PMMA） plates, which help increase the stiffness of the micropump. A maximum flow rate of 900μ*** 1 and a maximum backpressure of 1.8 kPa are recorded when water is used as pump liquid. We measured the power consumption of the micropump. The micropump is found to be a promising candidate for bio-medical application due to its bio-compatibility, portability, bidirectionality, and simple effective design.

关键词： peristaltic micropump LIPCA PDMS bio-medical applications

Investigation of Punch Resistance of the Allomyrira dichtoloma Beetle Forewing

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Journal of Bionic Engineering 2018年第1期15卷 57-68页

作者： Ngoc San Ha Vinh Tung Le nam seo goo Smart Microsystem Research Laboratory Department of Advanced Technology Fusion Division of Interdisciplinary Studies Konkuk University Seou105029 Republic of Korea Faculty of Science Engineering and Technology Swinburne University of Technology Hawthorn VIC 3122 Australia

In this study, the punch resistance of the beetle forewing was investigated to address the ability of the forewing against the external force. The punch resistance of the forewing was measured for different sizes and sexes of beetles using a conventional testing method in conjunction with the Digital Image Correlation （DIC） technique. The results showed that the maximum fracture load was measured around 23 N for the female beetle and around 20.2 N for the male beetle in the front-side punch test. Moreover, the fracture load in the front-side punch test was higher than that in the back-side punch test for both male and female beetles. This means that the beetle forewing plays a protection role against external loads. Furthermore, the puncture energy in the front-side punch test for the female beetle （6.91 m J） was a little higher than that for the male beetle （5.27 mJ）. In addition, the DIC results revealed that the first crack occurred along the trachea line and the second crack then appeared in the direction that was perpendicular to the direction of the first crack. This study provides a com- prehensive understanding of the mechanical protection properties of the beetle forewing and offers a good lesson for studying lightweight bio-inspired composite material.

关键词： beetle forewing punch test punch energy digital image correlation

Effect of an Artificial Caudal Fin on the Performance of a Biomimetic Fish Robot Propelled by Piezoelectric Actuators

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Journal of Bionic Engineering 2007年第3期4卷 151-158页

作者： seok Heo Tedy Wiguna Hoon Cheol Park nam seo goo Artificial Muscle Research Center Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Artificial Muscle Research Center and Smart Robot CenterKonkuk UniversitySeoul 143-701Korea

This paper addresses the design of a biomimetic fish robot actuated by piezoeeramic actuators and the effect of artificial caudal fins on the fish robot＇s performance. The limited bending displacement produced by a lightweight piezocomposite actuator was amplified and transformed into a large tail beat motion by means of a linkage system. Caudal fins that mimic the shape of a mackerel fin were fabricated for the purpose of examining the effect of caudal fm characteristics on thrust production at an operating frequency range. The thickness distribution of a real mackerel＇s fin was measured and used to design artificial caudal fins. The thrust performance of the biomimetic fish robot propelled by fins of various thicknesses was examined in terms of the Strouhal number, the Froude number, the Reynolds number, and the power consumption. For the same fm area and aspect ratio, an artificial caudal fin with a distributed thickness shows the best forward speed and the least power consumption.

关键词： LIPCA biomimetic fish robot caudal fro Strouhal number Froude number Reynolds number

Use of a Digital Image Correlation Technique for Measuring the Material Properties of Beetle Wing

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Journal of Bionic Engineering 2009年第3期6卷 224-231页

作者： Tailie Jin nam seo goo Sung-Choong Woo Hoon Cheol Park Biomemitics and Intelligent Microsystem Laboratory Department of Advanced Technology FusionKonkuk University

Beetle wings are very specialized flight organs consisting of the veins and *** it is necessary from a bionic view to investigate the material properties of a beetle wing *** the present study,we have used a Digital Image Correlation (DIC) technique to measure the elastic modulus of a beetle wing *** were prepared by carefully cutting a beetle hind wing into 3.0 mm by 7.0 mm segments (the gage length was 5 mm).We used a scanning electron microscope for a precise measurement of the thickness of the beetle wing *** specimen was attached to a designed fixture to induce a uniform displacement by means of a *** used an ARAMISTM system based on the digital image correlation technique to measure the corresponding displacement of a *** thickness of the beetle wing varied at different points of the *** elastic modulus differed in relation to the membrane arrangement showing a structural anisotropy;the elastic modulus in the chordwise direction is approximately 2.65 GPa,which is three times larger than the elastic modulus in the spanwise direction of 0.84 *** a result,the digital image correlation-based ARAMIS system was suc- cessfully used to measure the elastic modulus of a beetle *** addition to membrane's elastic modulus,we considered the Poisson's ratio of the membrane and measured the elastic modulus of a vein using an Instron universal tensile *** result reveals the Poisson's ratio is nearly zero and the elastic modulus of a vein is about 11 GPa.

关键词： digital image correlation technique beetle wing elastic modulus Poisson's ratio vein membrane

Design of a d_(33)-mode piezocomposite electricity generating element and its application to bridge monitoring

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Journal of Central South University 2014年第7期21卷 2572-2578页

作者： Jinkyo F.Choo Van Lai Pham nam seo goo Department of Civil Engineering Konkuk University Department of Advanced Technology Fusion Division of Interdisciplinary StudiesKonkuk University

The piezoelectric effect is used in sensing applications such as in force and displacement ***,the brittleness and low performance of piezoceramic lead zirconate titanate(PZT) often impede its applicability in civil structures which are subjected to large *** concept of a piezocomposite electricity generating element(PCGE) has been proposed for improving the electricity generation performance and overcoming the brittleness of piezoceramic *** post-curing residual stress in the PZT layer constitutes a main reason for the PCGE's enhanced performance,and the outer epoxy-based composites protect the brittle PZT layer.A d33-mode PCGE designed for bridge monitoring application was inserted in a bridge bearing to provide a permanent and simple weigh-in-motion *** designed PCGEs were tested through a series of tests including fatigue and dynamic tests to verify their applicability for monitoring purposes in a bridge structure.A simple beam example was presented to show the applicability of the proposed bridge bearing equipped with the PCGE for adequately measuring the traffic loads.

关键词：压电效应应用程序桥梁监测电元件设计复合发电性能固化残余应力

The Role of Elytra in Beetle Flight: Ⅰ.Generation of Quasi-Static Aerodynamic Forces

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Journal of Bionic Engineering 2010年第4期7卷 354-363页

作者： Patar Ebenezer Sitorus Hoon Cheol Park Doyoung Byun nam seo goo Cheol Heui Han National Research Laboratory for Biomimetics and Intelligent Microsystems Konkuk University Department of Advanced Technology Fusion Konkuk University Department of Aerospace Information System Engineering Konkuk University Department of Aeronautical and Mechanical Design Chungju National University

We conducted a comprehensive study to investigate the aerodynamic characteristics and force generation of the elytra of abeetle,Allomyrina *** analysis included wind tunnel experiments and three-dimensional computational fluiddynamics simulations using ANSYS-CFX *** first approach was a quasi-static study that considered the effect ofinduced flapping flow due to the flapping motion of the fore-wings (elytra) at a frequency of around 30 Hz to 40 *** dihedralangle was varied to represent flapping motion during the upstroke and *** found that an elytron producespositive lift at 0° geometric angle of attack,negative lift during the upstroke,and always produces drag during both the upstrokeand *** also found that the lift coefficient of an elytron does not drop even at a very high geometric angle of *** a beetle with a body weight of 5 g,based on the quasi-static method,the fore-wings (elytra) can produce lift of less than 1%of its body weight.

关键词： elytra angle of attack dihedral angle CFD wind tunnel test

Structural Characteristics of Allomyrina Dichotoma Beetle＇s Hind Wings for Flapping Wing Micro Air Vehicle

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Journal of Bionic Engineering 2014年第2期11卷 226-235页

作者： Ngoc San Ha Quang Tri Truong Hoang Vu Phan nam seo goo Hoon Cheol Park Biomimetics and Intelligent Microsystem Laboratory Department of Advanced Technology Fusion Division of Interdisciplinary Studies Konkuk University Seoul 143-701 Republic of Korea

In this study, we present a complete structural analysis ofAllomyrina dichotoma beetle＇s hind wings by investigating their static and dynamic characteristics. The wing was subjected to the static loading to determine its overall flexural stiffness. Dy- namic characteristics such as natural frequency, mode shape, and damping ratio of vibration modes in the operating frequency range were determined using a Bruel ＆ Kjaer fast Fourier transform analyzer along with a laser sensor. The static and dynamic characteristics of natural Allomyrina dichotoma beetle＇s hind wings were compared to those of a fabricated artificial wing. The results indicate that natural frequencies of the natural wing were significantly correlated to the wing surface area density that was defined as the wing mass divided by the hind wing surface area. Moreover, the bending behaviors of the natural wing and artificial wing were similar to that of a cantilever beam. Furthermore, the flexural stiffness of the artificial wing was a little higher than that of the natural one whereas the natural frequency of the natural wing was close to that of the artificial wing. These results provide important information for the biomimetic design of insect-scale artificial wings, with which highly ma- neuverable and efficient micro air vehicles can be designed.

关键词： beetle hind wing flexural stiffness natural frequency mode shape Micro Air Vehicles (MAVs)

Improvement of Artificial Foldable Wing Models by Mimicking the Unfolding/Folding Mechanism of a Beetle Hind Wing

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Journal of Bionic Engineering 2010年第2期7卷 134-141页

作者： Azhar Muhammad Quoc Viet Nguyen Hoon Cheol Park Do Y.Hwang Doyoung Byun nam seo goo Department of Advanced Technology Fusion Konkuk University National Research Laboratory for Biomimetics and Microsystems Konkuk University Artificial Muscle Research Center Konkuk University Departmenet of Aerospace Engineering Konkuk University

In an attempt to realize a flapping wing micro-air vehicle with morphing wings, we report on improvements to our previousfoldable artificial hind *** hinges, which were implemented to mimic the bending zone of a beetle hind wing, weremade of small composite hinge plates and tiny aluminum *** buck-tails of rivets were flared after the hinge plates wereassembled with the rivets so that the folding/unfolding motions could be completed in less time, and the straight shape of theartificial hind wing could be maintained after *** and unfolding actions were triggered by electrically-activatedShape Memory Alloy (SMA) *** wing folding, the actuation characteristics of the SMA wire actuator were modifiedthrough heat *** a series of flapping tests, we confirmed that the artificial wings did not fold back and arbitrarilyfluctuate during the flapping motion.

关键词： hind wing unfolding folding shape memory alloy folding ratio artificial wing

Stable Vertical Takeoff of an Insect-Mimicking Flapping-Wing System Without Guide Implementing Inherent Pitching Stability

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Journal of Bionic Engineering 2012年第4期9卷 391-401页

作者： Hoang Vu Phan Quoc Viet Nguyen Quang Tri Truong Tien Van Truong Hoon Cheol Park nam seo goo Doyoung Byun Min Jun Kim Department of Advanced Technology Fusion Konkuk University Seoul 143-701 Korea Department of Aerospace Engineering Konkuk University Seoul 143-701 Korea Department of Mechanical Engineering Sungkyunkwan University Seoul 143-701 Korea Department of Mechanical Engineering and Mechanics Drexel University Philadelphia USA

We briefly summarized how to design and fabricate an insect-mimicking flapping-wing system and demonstrate how to implement inherent pitching stability for stable vertical takeoff. The effect of relative locations of the Center of Gravity （CG） and the mean Aerodynamic Center （AC） on vertical flight was theoretically examined through static force balance considera- tion. We conducted a series of vertical takeoff tests in which the location of the mean AC was determined using an unsteady Blade Element Theory （BET） previously developed by the authors. Sequential images were captured during the takeoff tests using a high-speed camera. The results demonstrated that inherent pitching stability for vertical takeoff can be achieved by controlling the relative position between the CG and the mean AC of the flapping system.

关键词： beetle flapping-wing system insect-mimicking insect flight inherent pitching stability vertical takeoff