• 제목/요약/키워드: resultant

검색결과 2,060건 처리시간 0.028초

채터상황에서 마모된 공구가 받는 절삭력 해석 (Cutting Force Analysis Under Chatter Condition with a Worn Tool)

  • 권원태
    • 대한기계학회논문집
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    • 제18권2호
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    • pp.292-301
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    • 1994
  • The resultant cutting force during machining with a worn tool is viewed as a decomposition of the cutting force into a cutting force component related to chip removal from the workpiece and into a component dependent on the contact force between the tool flank's wear land and the workpiece. The shear line method, in which the cutting force is considered proportional to the length of the shear line, is used to calculate the cutting force component for the removal of the chip, while the elastic effect of the workmaterial on the tool is taken into consideration to analyze the effect of tool flank wear. The predicted resultant cutting force, expressed as the sum of both components, is compared to experimental data obtained during wave-on-wave cutting.

횡력발생 코일스프링 설계 및 제조에 관한 연구 (A Study on the Development of the Side Load Coil Spring)

  • 권혁홍;최선준
    • 한국생산제조학회지
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    • 제7권5호
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    • pp.98-105
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    • 1998
  • In the automotive suspension system, especially, Mcpherson strut type, if the resultant of the force through tire and the link reaction force is not coincident with the spring force, the side load against shock-absorber occur. The magnitude of side load is proportional to the difference between resultant force and spring force. To reduce side load, several method can be used, and one is to use the side load coil spring. This study summarize the development results of side load coil spring, i.e., how to design, analysis, manufacture, and test.

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유사 강지진동을 이용한 지반응답의 Amplication Factor 스펙트럼 분석 (Analysis of Amplication Factor of Response Spectrum using Strong Ground Motions Compatible to the Domestic Seismotectonic Characteristics)

  • 김준경
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 1997년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Fall 1997
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    • pp.88-93
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    • 1997
  • Amplication factor spectrum has been obtained and compared with standard Response Spectrum using the observed strong ground motions database. The observed ground motions from the Miramichi, Nahanni, Saguenay and New Madrid Earthquake (vertical component 19. horizontal component 36). which are estimated to represent domestic seismotectonic characteristics such as seismic source, attenuation, and site effect, are used for the analysis of amplication factor spectrum. Amplication factor has been calculated using both observed peak values and results from responses to the observed horizontal and vertical ground motions. The comparison shows that the amplication factors resultant from this study exceeds those of Standard Response Spectrum at relatively higher frequencies. The results implie that the characteristics of the seismic strong ground motion which may represent the domestic seismotectonic characteristics differs from those of Standard Response Spectrum, which are resultant from the strong ground motions observed mainly at the westem United States.

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Tiaprofenic Acid의 합성 (Synthesis of Tiaprofenic Acid)

  • 최홍대
    • 약학회지
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    • 제33권4호
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    • pp.237-240
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    • 1989
  • A new synthetic method for tiaprofenic acid, which is a potent anti-inflammatory agent, was described. Friedel-Crafts reaction of thiophene with ethyl ${\alpha}-chloro-{\alpha}-(methylthio)$ acetate (1) gave ethyl ${\alpha}-methylthio-2-thiopheneacetate$ (3). Ethyl ${\alpha}-methyl-2-thiopheneacetate$ (5) was prepared by treatment of (3) with NaH and MeI, followed by desulfurization with zinc dust-acetic acid of the resultant ethyl ${\alpha}-methyl-{\alpha}-methylthio-2-thiopheneacetate$ (4). Tiaprofenic acid (7) could be easily synthesized by benzoylation of (5) and hydrolysis of the resultant ethyl $5-benzoyl-{\alpha}-methyl-2-thiopheneacetate$ (6).

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하이브리드 신경망을 이용한 실내(室內) 쾌적감성(快適感性)모형 개발 (Development of Comfort Feeling Structure in Indoor Environments Using Hybrid Neuralnetworks)

  • 전용웅;조암
    • 대한인간공학회지
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    • 제20권2호
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    • pp.29-46
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    • 2001
  • This study is about the modeling of comfort feeling structure in indoor environments. To represent the degree of practical comfort feeling level in an environment, we measured elements of human sense and resultant elements of comfort feeling such as coziness, refreshment, and freshness with physical values(temperature, illumination, noise. etc.). The relationships of elements of human sense and elements of comfort feeling were formulated as a fuzzy model. And a hybrid-neural network with three layers were designed where obtained from fuzzy membership function values of the elements of human sense were used as inputs, and given as fuzzy membership function values of resultant elements of comfort feeling were used as outputs. Both kinds of fuzzy membership function values were obtained from physical values. The network was trained by measured data set. The proposed hybrid-neural network were tested and proposed a more realistic model of comfort feeling structure in indoor environments.

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리니어 모터를 적응한 공작기계의 열변형 특성에 관한 연구 (A Study on the thermal behaviors of a machine tool with linear motors)

  • 김종진;조동우
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 추계학술대회 논문집
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    • pp.36-40
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    • 2002
  • The development of feed drive system with high speed and accuracy has been a major issue in the machine tool industry. Linear motors can be used as the efficient tool to achieve fast feed mechanism and high accuracy. However. a high speed feed drive system with linear motors can generate heat problems such as the variation of temperature distribution and the resultant thermal stress. In this paper, the important heat sources and the resultant thermal errors are presented. The thermal deformation characteristics of the machine tool with linear motors were identified, which are thermal expansion of linear scale, shrinkage, expansion and bending in the machine tool structure.

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$(\pm)$-2-[p-(1-Oxo-2-isoindolinyl)phenyl]butyric acid(인도부펜)의 합성 (Facile Synthesis of $(\pm)$-2-[p-(1-Oxo-2-isoindolinyl)phenyl]butyric acid (Indobufen))

  • 최홍대;강병원;마정주;윤호상
    • 약학회지
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    • 제35권5호
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    • pp.389-393
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    • 1991
  • A convenient method for the synthesis of indobufen, which is a potent antiinflammatory agent, was described. Ethyl 2-phenylbutyrate(4) was prepared by Friedel-Crafts reaction of benzene with ethyl $\alpha$-chloro-$\alpha$-(methylthio)acetate(l) followed by ethylation and desulfurization of the resultant ethyl 2-(methylthio)phenylacetate(2). Ethyl 2-(p-aminophenyl)butyrate(6) was prepared by nitration of (4) and successive reduction of ethyl 2-(p-nitrophenyl) butyrate(5). Indobufen was obtained by condensation reaction of (6) with phthalic anhydride followed by reduction and hydrolysis of the resultant ethyl 2-[p-(1, 3-dioxo-2-isoindolinyl)phenyl]butyrate(7).

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Automatic generation of equilibrium and flexibility matrices for plate bending elements using Integrated Force Method

  • Dhananjaya, H.R.;Nagabhushanam, J.;Pandey, P.C.
    • Structural Engineering and Mechanics
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    • 제30권4호
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    • pp.387-402
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    • 2008
  • The Integrated Force Method (IFM) has been developed in recent years for the analysis of civil, mechanical and aerospace engineering structures. In this method all independent or internal forces are treated as unknown variables which are calculated by simultaneously imposing equations of equilibrium and compatibility conditions. The solution by IFM needs the computation of element equilibrium and flexibility matrices from the assumed displacement, stress-resultant fields and material properties. This paper presents a general purpose code for the automatic generation of element equilibrium and flexibility matrices for plate bending elements using the Integrated Force Method. Kirchhoff and the Mindlin-Reissner plate theories have been employed in the code. Paper illustrates development of element equilibrium and flexibility matrices for the Mindlin-Reissner theory based four node quadrilateral plate bending element using the Integrated Force Method.

파라미터 교정법을 이용한 대국적인 수럼성을 갖는 간접적응제어기 (A Globally Convergent Pole Placement Indirect Adaptive Controller using Parameter Correction)

  • 김홍필;양해원
    • 대한전기학회논문지
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    • 제38권11호
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    • pp.913-921
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    • 1989
  • 본논문에서는 임의의 영점들을 갖는 이산시간 선형시불변계통의 극배치 간접적응제어기 설계문제를 다루었다.외부입력은 persistent excitation 조건을 만족하고, 주어진 계통의 분자다항식과 분모 다항식에 의해 정해지는 Sylevester resultant 행렬식의 하한을 안다는 가정하에, 전체 폐루우계통이 대국적으로 안정함을 보였다. 간접적응제어시 발생되는 추정된 계통의 가제어성 문제는 파라미터 교정방법을 확장시켜 해결하였다. 2차 플랜트에 대한 전산기 simulation을 통하여 본논문의 제어알고리즘의 유용성을 확인하였다.

Hydrodynamic characteristics of cambered NACA0012 for flexible-wing application of a flapping-type tidal stream energy harvesting system

  • Sitorus, Patar Ebenezer;Park, JineSoon;Ko, Jin Hwan
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제11권1호
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    • pp.225-232
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    • 2019
  • In recent years, nonlinear dynamic models have been developed for flapping-type energy harvesting systems with a rigid wing, but not for those with a flexible wing. Thus, in this study, flexible wing designs of NACA0012 section are proposed and measurements of the forces of rigid cambered wings, which are used to estimate the performance of the designed wings, are conducted. Polar curves from the measured lift and drag coefficients show that JavaFoil estimation is much closer to the measured values than Eppler over the entire given range of angles of attack. As the camber of the rigid cambered wings is increased, both the lift and drag coefficients increase, in turn increasing the resultant forces. Moreover, the maximum resultant forces for all rigid cambered wings are achieved at the same angle of attack as the maximum lift coefficient, meaning that the lift coefficient is dominant in representations of the wing characteristics.