Thin-type 초음파모터의 최적설계 및 구동특성

정성수 창원대학교 일반대학원 2010 국내박사

Abstract A Study on Optimal Design and Driving Characteristics of Thin-type Ultrasonic Motor by Seong Su Jeong Dept. of Electrical Engineering Graduate School, Changwon, National University Changwon, Korea Directed by prof. Tae Gone Park Ph.D. In this study, novel structured thin-type ultrasonic motor has been proposed. It is possible to fabricate thin type ultrasonic motor by using simple punching skill. A thin metal plate was used as a cross shaped vibrator and sixteen ceramic plates were attached on upper and bottom side of the metal plate. From the thin stator, elliptical displacements of the four contact tips were obtained. When two harmonic voltages which have 90o phase difference were applied to the ceramics, the symmetric and anti-symmetric displacements were generated at inside of the tips to make the elliptical motion. A finite element analysis (ATILA) was used for simulating the motional pattern of contact tips of the stator. FEM enabled both ceramic length and parameters of width affecting longitudinal vibration to be analyzed. Afterward, reciprocal action of length, width was examined after FEM analysis about thickness of ceramics. In addition, stator characteristic about change of material and scale was analyzed. Optimal designed thin type ultrasonic motor was fabricated by using FEM analysis. Speed, torque, and current were measured by applying sinusoidal waves through driving equipment such as function generator, power amplifier: to measure characteristic of the motor. Two-drivers which generate sinusoidal waves and square waves were designed respectively, and then were compared through some experiments in order to be put to practical use. Below ones are operation characteristic of motor and result of optimal designed thin type ultrasonic motor. 1) As a result of FEM analysis, it is able to find out four resonances mode equally regardless of all sorts of models. Mode 1 had significant displacement among four resonance modes. Frequency was proportional to length of ceramic and inversely proportional to thickness. 2) As a result of FEM analysis about change of ceramic length and width, model 'W3T1L24' had the highest elliptical displacement. This consequence represented that is same to longitudinal vibration(transverse mode of ceramic). However, if the proportion of length to width is higher than the ratio of one to eight, it might cause buckling. 3) As a result of FEM analysis about change of ceramic thickness, model W3T1L24 and W3T1.5L27 had significant displacement. Maximum displacement represented reciprocal action which length was lengthened according to ceramic thickness. Speed and torque characteristic of W3T1L24, optimal motor model, was proportional to voltage. It showed 65[rpm] speed and 25[gfcm] torque at 30[Vrms]. 4) As a result of FEM analysis about material change of elastic body, magnitude of elliptical displacement was steel, brass, aluminum and copper in order. This was same to speed characteristic about motor fabrication. Torque characteristic was steel, copper, brass and aluminum in order. Besides, material which had high Young's modulus generated high speed and torque. 5) As a result of FEM analysis about scale change of stator, elliptic displacement wasn't proportional to scale. In addition, There is not much in it at speed and torque experiment. 6) Characteristic of optimal model ‘W3T1L24' was measured by using driving equipment. In conclusion, both maximum speed and minimum current was measured at 30[Vrms] voltage, 72.4[kHz] and 0.25[N] preload. 7) Two-drivers which generate sinusoidal waves and square waves were designed respectively, and then were compared through some experiments in order to be put to practical use. In conclusion, the drivers had similar characteristic of speed-torque at alike frequency and voltage. Characteristic was measured by utilizing newly devised driver generating sinusoidal waves and driver generating square waves. As a result, linear change of speed was measured at each range, 71.5~72.4[kHz] of driving equipment, 71.8~72.4[kHz] of sinusoidal waves driver and 71.9~72.4[kHz] of square waves driver, respectively. The linear parts of speed increased with frequency and the parts are necessary to put ultrasonic motor to practical use. In case of the sinusoidal wave driver, the current consumption was increased more than the driver using function generator and power amplifier because of losses of transformer and FET. On the other hand, the square wave driver made no difference with the driver using function generator and power amplifier. Therefore, it would be recommended to apply the square wave driver for practical use of the motor. Speed was in linearly inverse proportion to Torque. In comparison with driver generating sinusoidal wave, the characteristic of semi-conductor driver generating square wave was hardly different. Besides, it was also able to design more easily at low cost. So, it will be able to make driver unified as One-chip.

AMF기술을 적용한 SWRO 생산수의 잔류붕소제거 및 해수로부터의 붕소회수에 관한 연구

정성수 한국해양대학교 대학원 2013 국내석사

In this study, we have developed an efficient technique to remove boron from SWRO permeate water (1.51 mg B/L) and recover it from seawater (4.5 mg B/L) based on the adsorption membrane filtration (AMF) process. CRB05, a commercial boron selective resin (BSR) produced in Mitsubishi chemical Co., is used as an adsorbent. The commercial BSR (300-850um) is grinded to make fine-grain BSR with diameter 10-3000um. The performance by the fine-grain BSR is compared with that by the commercial BSR without grinding for each process of AMF (boron adsorption by BSR, boron desorption from saturated BSR using acid, and regeneration of BSR using base). In the process of boron adsorption from SWRO permeate water, the optimal performance is achieved at 1 g/L of BSR/solution ratio, 150 rpm of stirring speed, and 10 min of reaction time by using the fine-grain BSR, which results in maximum adsorption capacity of 11.68mg B/g BSR. Particularly the reaction time using the fine-grain BSR is shortened by 6 times compared to the commercial BSR. Furthermore, the adsorption capacity is increased by 3 times. In the process of boron adsorption from seawater, on the other hand, the optimal performance occurs at 0.1 g/L of BSR/solution ratio, 100 rpm of stirring speed, and 5 min of reaction time by using the fine-grain BSR, where the reaction time is 60 times shorter than that by the commercial BSR. In the meantime, there is no noticeable difference between SWRO permeate water and seawater in the efficiency of boron desorption from saturated BSR using sulfuric acid and hydrochloric acid. The optimal concentration and volume of sulfuric acid are 0.05M and 1.6L/kg-BSR, respectively, while those of hydrochloric acid are 0.25M and 2.2L/kg-BSR, respectively. Up to 100% of boron is desorbed under the optimal conditions. It is found that both commercial and fine-grain BSRs can be reused with only ±3% of variance in the efficiency of adsorption. The desorbed boron in acid solution is solidified into B(OH)3 by heating and cooling. In addition, the solid boron is formed as sodium borate and calcium borate by reacting with NaOH and Ca(OH)2, respectively, at 140℃.

CFRP 코일 스프링의 특성에 관한 수치해석적 연구

정성수 전주대학교 문화산업대학원 2018 국내석사

현재 미래의 가장 큰 이슈는 “경량화” 로서 산업 전반에 걸쳐 이에 대한 연구가 활발히 진행되어지고 있다. 이중 각종 현가장치에서 가장 중요한 요소로 사용되는 압축 코일스프링의 경우 대부분 금속재질을 사용하고 있으나 금속재질의 특성상 부식에 취약하며 치핑(Chipping)이 발생하는 등의 문제점을 가지고 있다. 따라서, 본 논문에서는 압축 코일스프링의 재질에 탄소복합재료CFRP(Carbon Fiber Reinforce Plastic)를 적용함으로서 기존 금속재질에 대한 문제를 해결 하고자 하였다. 또한 압축 코일스프링의 3D 모델링 및 ANSYS를 이용한 유한요소 해석을 통해 스프링상수 도출 및 이론값과의 비교를 통해 해석의 신뢰성을 확보하고 기존 금속 재질 코일스프링을 대체하기에 적합한지에 대해 확인하였다. 기존 금속 재질의 대표로 선정한 Structural Steel의 스프링상수 값은 해석 값과 이론값이 7.3N/mm 와 7.0N/mm로 확인되었고 이는 일방향 탄소섬유(0°)의 최대값인 1.09N/mm 와 1.25N/mm에 비해 현저히 높음으로 일방향 탄소섬유로 기존 금속재질의 스프링의 성능을 구현 해 내기에는 어려움이 있다는 것을 확인 하였다. 따라서 일방향 탄소섬유의 90도방향 하중에 대한 취약함을 대체하기 위하여 직조탄소섬유(0/90°)의 물성을 대입하여 추가적으로 해석을 진행하였고 여러 가지 설계인자들을 변경 해 가며 얻어낸 직조탄소섬유(0/90°)의 최대값은 6.47N/mm 와 7.21N/mm로 기존 금속재질인 Structural Steel의 상수 값에 대비하여 이론값 103%, 해석 결과 값 88.6%를 도출 해 내었다. 또한 해석 값과 이론값의 오차율을 계산하여 전체 데이터들의 정확성에 대한 검토를 진행 하였고 오차율은 평균 2.4%로 비교적 만족스러운 신뢰성을 확보할 수 있었다. 따라서 탄소섬유는 기존 금속재질의 단점을 극복하면서 탄소소재 자체의 장점을 유지할 수 있는 코일 스프링으로서의 적용 가능성을 확인하였으며 향 후 개발에 따라 상용화 가능성에 대한 충분한 근거를 수립하였다. Currently, the biggest issue in the future is "lightweight", and research is being actively conducted throughout the industry. In the case of compression coil springs used as the most important elements in various suspension devices, most of them use metal materials, but they are susceptible to corrosion due to the nature of the metal material and have a problem of chipping. Therefore, in this paper, we tried to solve the problem of existing metal materials by applying carbon composite material (CFRP) to the material of compression coil spring. In addition, the 3D modeling of the compression coil spring and the finite element analysis using ANSYS are used to obtain the spring constant and to compare with the theoretical value to confirm the reliability of the analysis and confirm whether it is suitable to replace the coil spring of the existing metal material. The spring constant value of the structural steel selected as representative of the existing metal material is the analytical value and the theoretical value It is confirmed that the strength of spring of conventional metallic material is uni-directional carbon fiber, which is 7.3N/mm and 7.0N/mm, which is significantly higher than 1.09N/mm and 1.25N/mm, which are maximum values ​​of unidirectional carbon fiber(0°) We have found that it is difficult to implement. Therefore, in order to substitute the weakness of unidirectional carbon fiber with 90degree directional load, the property of woven carbon fiber(0/90°) The maximum values ​​of the woven carbon fibers(0/90°) obtained by varying various design parameters were 6.47N/mm and 7.21N/mm in comparison with the constant values ​​of the conventional metallic material, Structural Steel. Theoretical value 103%, and the analysis result value 88.6%. In addition, the error rate of the analytical value and theoretical value was calculated and the accuracy of the whole data was examined. The average error rate was 2.4%, which was relatively satisfactory. Therefore, it is considered that carbon fiber is a suitable substitute for coil spring that can overcome the disadvantages of existing metal materials and maintain the advantages of carbon material itself. It is thought that there is enough possibility to be developed and commercialized.

Glycopyrrolate(Robinul)가 scopolamine의 徐脈에 미치는 影響

정성수 全南大學校 1982 국내석사

正常成人에 있어서 scopolamine에 依한 徐脈에 對한 glycopyrrolate의 影響과, glycopyrrolate에 依한 心博數의 變動에 미치는 scopolamine의 影響을 硏究하여 다음과 같은 結果를 얻었다. 1. 少量의 scopolamine 0.1mg의 靜注는 심한 心搏數의 減少를 나타냈다. 2. 少量의 glycopyrrolate 0.1mg의 靜注는 心搏數의 큰 변동을 일으키지 아니하였다. 3. Glycopyrrolate 0.1mg 靜注 10分 後 scopolamine 0.1mg 靜注로서 意義있는 心搏數의 增加를 나타냈다. 4. Glycopyrrolate 0.1mg 靜注 10分 後에는 scopolamine 0.1mg 靜注에 依한 心搏數의 減少는 현저히 變化 되었다. 5. Scopolamine 0.1mg 靜注 10分 後 glycopyrrolate 0.1mg 靜注는 意義있는 心博數의 增加를 나타냈다. 6. 以上의 實驗結果는, 少量의 scopolamine에 依한 徐脈은, glycopyrrolate 追加投與로서 抑制되고 또 glycopyrrolate 前投與로도 抑制될 수 있음을 示唆하였다. Glycopyrrolate, a synthetic quarternary ammonium compound, has a similar pharmacologic properties to that of scopolamine, a belladonna alkaloid. Since quarternary ammonium compound, do not readily cross the blood brain barrier, glycopyrrolate has lesser central effect than scopolamine, a tertiary-amine compound. The author administered a small dose of scopolamine and glycopyrrolate to human volunteers, and examined the effect on heart rate in both drugs. The results were as follows ; 1. A small dose of scopolamine (0.1mg) showed significant decrease in the heart rate. 2. A small dose of glycopyrrolate (0.1mg) induced little change 3. A small dose of glycopyrrolate (0.1mg) 10 minutes after glycopyrrolate (0.1mg) showed marked increase in the heart rate. 4. A small dose of scopolamine (0.1mg), given 10 minutes after glycopyrrolate (0.1mg), showed much less bradycardia effect 5. A small dose of glycopyrrolate (0.1mg) 10 minutes after scopolamine (0.1mg) showed significant increase in the heart rate 6. Scopolamine induced bradycardia was suppressed by an additional dose of glzcopyrrolate, and a preceding dose of glycopyrrolate.

Methoxamine의 家兎心단減少作用에 관하여

정성수 전남대학교 1986 국내박사

1) 靜脈內 methoxamine은 血壓 上昇 및 心搏數 減少를 일으켰으며, 靜脈內 atropine(2mg/kg) 處理下에서 血壓 上昇效果는 그대로 나타났고 心搏數 減少效果는 有意하게 減弱되었으나 顯著한 心搏數 減少는 存續하였다. 2) 靜脈內 methoxamine에 의한 心搏數 減少效果는 靜脈內 prazosin, yohimbine, guanethidine, propranolol의 影響을 받지 않았고. chlorisondamine 또는 reserpine 處理下에서는 弱化되었다. 3) 靜脈內 methoxamine에 의한 昇壓效果는 靜脈內 prazosin 處理下에는 減弱되었으나, yohimbine, guanethidine, chlorisondamine, propranolol, reserpine 處理下에서는 거의 變動이 없거나 오히려 强化되었다. 4) 腦室內 methoxamine은 血壓上昇 및 心搏數減少를 일으켰다. 5) 腦室內 methoxamine에 의한 心搏數 減少效果는 靜脈內 atropine, prazosin, yohimbine의 影響을 받지않았으며, 靜脈內 guanethidine, chlorisondamine, propranolol, reserpine 및 腦室內 atropine, prazosin, yohimbine, propranolol 로는 各各 減弱되었다. 6) 腦室內 methoxamine에 의한 昇壓效果는 腦室 및 靜脈內 prazosin 으로 各各 減弱되었으나 靜脈內 atropine, guanethidine, chlorisondamine propranolol, reserpine, yohimbine 및 腦室內 atropine, prazosin, propranolol의 影響은 받지않았다. 7) Methoxamine의 心搏數 減少는 alpha l-adrenoceptor에 對한 選好性에 의한 것이 아니며 腦의 여러가지 receptor에 非特異的으로 作用하여 末梢 交感神經系 機能을 低下시켜 일어나는 것으로 思料되었다. The bradycardiac and pressor responses to intravenous and intraventricular methoxamine were examined in urethane-anesthetized rabbits. 1. Intravenous methoxamine produced bradycardiac and pressor responses. Atropine (2mg/kg,i.v.) weakened but not abolished the bradycardiac effect. 2. The bradycardiac effect elicited by intravenous methoxamine was not affected by intravenous prazosin, yohimbine, guanethidine and propranolol, but was attenuated by intravenous chlorisondamine and reserpine. 3. The pressor effect elicited by intravenous methoxamine was weakened by intravenous prazosin, but was scarcely affected, rather potentiated, by intravenous yohimbine, quanethidine, chlorisondamine, propranolol and reserpine. 4. Intraventricular methoxamine produced pressor and bradycardiac responses. 5. The bradycardiac effect elicited by intraventricular methoxamine was not affected by intravenous atropine, prazosin and yohimbien. This was attenuated by intravenous guanethidine, chlorisondamine, propranolol and reserpine, and by intraventricular atropine, prazosin and propranolol, respectively. 6. The pressor effect elicited by intraventricular methoxamine was attenuated by intraventricular and intravenous prazosin. This was not affected by intravenous atropine, guanethidine, chlorisondmaine, propranolol, reserpine and yohimbine, and by intraventricular atropine, prazosin and propranolol, respectively. 7. From these results it was inferred that the bradycardiac effect elicited by methoxamine was not an action through the mediation of alpha l-adrenoceptors but was a result from non-specific actions on some brain receptors.

진주를 중심으로 한 서부경남 지역의 안개발생 특성

정성수 경상대학교 2003 국내석사

Aspergillus nidulans의 유성분화에 관여하는 유전자들의 연구

정성수 원광대학교 2000 국내석사

國民學校 實科實習室의 空間構成 및 設置에 關한 硏究

정성수 圓光大學校 1987 국내석사

리브가 있는 수축 및 확대 직사각형 채널에서 난류열전달과 마찰계수 특성

정성수 경상대학교 대학원 2017 국내박사

Turbine blade cooling, a common practice in modern aircraft engines, is accomplished among other methods by passing the cooling air through an open serpentine passage in the core of the blade. Furthermore, to enhance the heat transfer coefficient, the convergent/divergent passages modelling the blade passage are roughened with rib-shaped turbulence promoters, at which the rib surfaces comprise a large portion of the passage heat transfer area. Therefore, an accurate account of the heat transfer coefficient on the rib surfaces in the convergent/divergent channel is critical in the overall design of the blade cooling system. The experimental measurements of heat transfer and friction factors in the ribbed convergent/divergent channels are done. Thermal performance of the ribbed rectangular convergent/divergent channels are also compared with the square straight channel under three constraints: identical mass flow, identical pumping power, and identical pressure drop. Five(5) different studies on the ribbed convergent/divergent channels were considered as follows: 1.Effect of convergence ratio on heat transfer and friction factor in the channel 2.Effect of divergence ratio on heat transfer and friction factor in the diverging channel 3.Turbulent heat transfer and friction in rectangular convergent and divergent channels with ribs on one wall. 4.Effect of rib pitch on heat transfer and friction factor in a two wall divergent channel 5.Effects of angled ribs on turbulent heat transfer and friction factors in a rectangular divergent channel The major findings are as follows : 1) The friction factors increase and the convective heat transfer decrease with increasing the ratio of channel convergence. 2) The Nusselt numbers in the two sided heating are greater than those in the four sided heating. 3) The total friction factor and convertive heat transfer coefficients decrease with increasing the ratio of divergence of the channel. 4) Among the four channel (Dho/Dhi =0.67, 0.86, 1.16 and 1.49), the divergent channel of =1.49 has the highest thermal performance at the identical mass flow rate, and the divergent channel of =1.16 has the highest at the identical pumping power and static pressure drop. 5) The ratio of =6 shows the highest valve in the heat transfer and the ratio of =10 indicates the greatest friction factor in the ribbed divergent channel.

이소시아네이트와 알카이닐다이메틸 알루미늄을 이용한 프로피올 아마이드의 합성

정성수 대구가톨릭대학교 대학원 2015 국내석사

Previously we observed and searched alkynyl ketones which is converted from many kinds of substituted nitrile with using alkynylaluminum reagents. From that time, we studied broadly about the reactant of alkynylaluminum reagents and its effect on multiple ranges of organic synthetic part. Alkynylaluminum, it is good substrate to make many kinds of ketones and it shows highly effective reaction in cross-linking of hetero bi-functional groups, allylic substitution reactions, synthesis of alkyne-substituted quaternary carbon, cyclo-addition reactions, Lewis Base directed cyclo-addition reaction and etc. And also it is worked easily to convert amidines from amides. Our study was progressed with using simple substituted isocyanate (R1) and general kinds of alkyne (R2) to synthesize propiolamide groups. Conventionally they have been prepared from the reaction of metal alkynylidene and amidation of alkynyl acids. So, it is important to develope efficient and easy procedure for the synthesis of propiolamides. As a part of ongoing program on the development of novel synthetic methods in organic synthesis, we report herein an efficient procedure for the synthesis of N-substituted propiolamides from isocyanates using alkynyldimethyl aluminum reagents. To verify the functional group tolerance, a variety of isocyanate substrates were reacted with alkynyldimethylaluminum reagents derived from wide range of terminal alkynes to provide desired products in excellent yield. All these results were get from GC-MS, 1H, 13NMR and High resolution Mass analysis.