• 제목/요약/키워드: in-plane and out-of-plane

검색결과 1,847건 처리시간 0.031초

단일 진동체의 진동 흡진기 설계 기법 (Design of a Vibration Absorber for an Elastically Suspended Rigid Body)

  • Kim, Dong-Wook;Park, Yong-Je
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
    • /
    • pp.325.2-325
    • /
    • 2002
  • A new methodology is presented for the multi-degree-of-freedom vibration absorber for an elastically suspended rigid body with the planes of symmetry in general motion. Unlike the common single degree-of-freedom vibration absorber, the presented methodology makes use of both linear and rotational properties of the absorber. It is suggested that an absorber is designed separately for the in-plane and out-of-plane axes of vibration and combined the two cases for a six-degree-of-freedom absorber. (omitted)

  • PDF

1,3-Cyclohexadiene의 고리반전 진동운동에 미치는 환산질량 효과 (Reduced Mass Effects on the Ring Inversion Vibration of 1,3-Cyclohexadiene)

  • 주재범;한성준
    • 대한화학회지
    • /
    • 제41권3호
    • /
    • pp.123-129
    • /
    • 1997
  • 1,3-CHD의 비평면 고리반전 진동운동에 미치는 환산질량 효과를 고찰하기 위하여 원자간의 결합 벡터 모델을 이용한 컴퓨터 프로그램을 작성하였고, 이로부터 큰 진폭으로 운동하는 고리반전 진동운동에 대한 운동에너지 팽창함수를 계산하였다. 1,3-CHD의 운동에너지 팽창함수의 계산에 필요한 구조 파라미터들은 순이론적 HF/6-31G** 방법에 의하여 결정하였으며, 이 화합물의 비평면 고리반전 진동운동에 대한 위치에너지 함수는 운동에너지 팽창함수와 이전에 보고된 저주파 라만 데이터를 이용하여 결정하였다. 그 결과 1,3-CHD의 비평면 진동좌표에 대한 운동에너지 팽창함수를 고려하여 진동 Hamiltonian을 계산하였을 때 1,3-CHD의 고리반전 진동운동에 대한 보다 신빙성 있는 비평면 위치에너지 함수를 결정할 수 있었다.

  • PDF

EDISON Co-rotational Plane beam-Dynamic tip load를 이용한 가진주파수 변화에 따른 외팔보의 자유단 진동 연구

  • 박철우;주현식
    • EDISON SW 활용 경진대회 논문집
    • /
    • 제4회(2015년)
    • /
    • pp.246-250
    • /
    • 2015
  • In this paper, Timoshenko and Euler-Bernoulli beam theories(EB-beam) are used, and Fast Fourier Transformation(FFT) analysis is then employed to extract their natural frequencies using both analytical approach and Co-rotational plane beam(CR-beam) EDISON program. EB-beam is used to analyze a spring-mass system with a single degree of freedom. Sinusoidal force with various frequencies and constant magnitude are applied to tip of each beam. After the oscillatory tip response is observed in EB-beam, it decreases and finally converges to the so-called 'steady-state.' The decreasing rate of the tip deflection with respect to time is reduced when the forcing frequency is increased. Although the tip deflection is found to be independent of the excitation frequency, it turns out that time to reach the steady state response is dependent on the forcing frequency.

  • PDF

홀로그래픽 간섭무늬에 의한 변형률 측정

  • 권혁흥;조동현;김흥석;박승옥;조대근;권영하
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1994년도 추계학술대회 논문집
    • /
    • pp.529-533
    • /
    • 1994
  • Atrains in microstain range are measured accurately by means of holographic interometric technique. Holographic fringes of the cantilever beam subjected to out-of-plane deflection and in-plane deflection respectively are obtained experimentally. Form these fringe patterns, 3rd order polynomial of displacements is induced using polynomial regression method. And strain stress distribution could be determined from the secound derivative of this polynomial. These results agree well with FEM.

  • PDF

Side Slip Angle Based Control Threshold of Vehicle Stability Control System

  • Chung Taeyoung;Yi Kyongsu
    • Journal of Mechanical Science and Technology
    • /
    • 제19권4호
    • /
    • pp.985-992
    • /
    • 2005
  • Vehicle Stability Control (VSC) system prevents vehicle from spinning or drifting out mainly by braking intervention. Although a control threshold of conventional VSC is designed by vehicle characteristics and centered on average drivers, it can be a redundancy to expert drivers in critical driving conditions. In this study, a manual adaptation of VSC is investigated by changing the control threshold. A control threshold can be determined by phase plane analysis of side slip angle and angular velocity which is established with various vehicle speeds and steering angles. Since vehicle side slip angle is impossible to be obtained by commercially available sensors, a side slip angle is designed and evaluated with test results. By using the estimated value, phase plane analysis is applied to determine control threshold. To evaluate an effect of control threshold, we applied a 23-DOF vehicle nonlinear model with a vehicle planar motion model based sliding controller. Controller gains are tuned as the control threshold changed. A VSC with various control thresholds makes VSC more flexible with respect to individual driver characteristics.

3차원 물체의 공간정보를 이용한 임의의 집속면에 대응하는 디포커싱 영상 구현 (Defocusing image generation corresponding to focusing plane by using spatial information of 3D objects)

  • 장재영;김영일;신동학;이병국;이준재
    • 한국정보통신학회논문지
    • /
    • 제17권4호
    • /
    • pp.981-988
    • /
    • 2013
  • 본 논문에서는 집적 영상 기술을 이용하여 한 번의 획득 과정을 통하여 물체의 3차원 공간정보를 저장한 후 저장된 정보를 이용하여 집속면(focusing plane)에 대응하는 디포커싱 영상을 구현하는 방법을 제안한다. 집속면에 대응하는 ${\delta}$-함수 배열과 기본영상의 콘볼루션 연산을 통하여 집속면에 대응하는 포커싱 및 디포커싱영상을 구현하였다. 디포커싱 정도는 집속면과 물체거리의 차이에 따라 상대적으로 달라짐을 관찰 할 수 있었다. 제안하는 방법에 대한 기초적인 실험을 수행하고 그 결과를 보고한다.

Asymmetric Mean Metallicity Distribution of the Milky Way's Disk

  • An, Deokkeun
    • 천문학회보
    • /
    • 제44권2호
    • /
    • pp.49.1-49.1
    • /
    • 2019
  • I present the mean metallicity distribution of stars in the Milky Way based on photometry from the Sloan Digital Sky Survey. I utilize an empirically calibrated set of stellar isochrones developed in previous work to estimate the metallicities of individual stars to a precision of 0.2 dex for reasonably bright stars across the survey area. I also obtain more precise metallicity estimates using priors from the Gaia parallaxes for relatively nearby stars. Close to the Galactic mid-plane (|Z| < 2 kpc), a mean metallicity map reveals deviations from the mirror symmetry between the northern and southern hemispheres, displaying wave-like oscillations. The observed metallicity asymmetry structure is almost parallel to the Galactic mid-plane, and coincides with the previously known asymmetry in the stellar number density distribution. This result reinforces the previous notion of the plane-parallel vertical waves propagating through the disk, which have been excited by a massive halo substructure such as the Sagittarius dwarf galaxy plunging through the Milky Way's disk. This work provides evidence that the Gaia phase-space spiral may continue out to |Z| ~ 1.5 kpc.

  • PDF

다니엘 리베스킨트 건축의 역동성에 적용된 상대적 균형감 - 뮤지엄 건축을 중심으로 - (Counterbalance applied to the Dynamics of Daniel Libeskind's Architecture - Focused on Libeskind Museums -)

  • 이다경;조자연
    • 한국실내디자인학회논문집
    • /
    • 제24권1호
    • /
    • pp.64-71
    • /
    • 2015
  • This study aims to disclose the dynamics of Daniel Libeskind Museums by the principles of counterbalance. Balance as a dynamic concept is the settlement of instability and tension and to draw overall sense of balance by controlling new perception elements that may cope with the unbalance elements. This is based on balancing compensation and can be explained as a counterbalance. Daniel Libeskind, a representative architect of deconstructivism, creates dynamic space by using oblique lines on the plane. The study was carried out under the assumption that this space would be designed under the certain principles rather than the result of momentary feelings and the analysis was conducted by the counterpoint of music and counterbalance. As a result, Daniel Libeskind balances in a way of forming the mutual right angle by using oblique lines which cancel out the unbalance in plane composition or making the same angle based on vertical / horizontal axis. Counterbalance has been achieved in the section and elevation as well as plane and complex and diverse oblique lines were worked under the constant principle not accidental results. The axes of Daniel Libeskind's architecture have been known to follow contextualism with symbolism and historicity but it was found that a design technique considering counterbalance was used in the overall control.

초음파-파면해석에 의한 대차 프레임의 건전성 평가 (Integrity evaluations of bogie frame using ultrasonic-fractography analysis)

  • 윤인식;권성태;정우현;박덕신;김경국
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2000년도 추계학술대회 논문집
    • /
    • pp.461-467
    • /
    • 2000
  • This study proposes the integrity evaluation of bogie frame using ultrasonic waves-fractography analysis. Analysis objectives in this study are to investigate fracture planes of damaged zone by the A-scan method. The surface condition of fracture plane shows degree of degradation by stress concentration. The detection of the natural defects in bogie frame is performed using the characteristics of echodynamic pattern in ultrasonic signal. Results of ultrasonic testing agree fairly well with those of actual fracture plane. In quantitative fractography analysis, microstructures of actual fracture plane turned out to be intergranular and transgranular fracture, Proposed ultrasonic-fractography analysis in this study can be used for the integrity evaluation of the bogie frame

  • PDF

Spin-Torque Oscillator using a Perpendicular Polarizer with Double Free Layers

  • Seo, Soo-Man;Lee, Kyung-Jin
    • Journal of Magnetics
    • /
    • 제13권4호
    • /
    • pp.153-156
    • /
    • 2008
  • We conducted a micromagnetic modeling study to investigate the spin torque oscillator (STO) using a perpendicular polarizer. We used an additional layer of negative anisotropy constant materials (NAM) on a conventional STO. For the NAM layer, the magnetic easy plane is parallel to the in-plane easy axis of the free layer, and inhibits the development of the out-of-plane component of the magnetization in the free layer. As a result, this new type of STO provides a high frequency limit up to 50 GHz.