• 제목/요약/키워드: Mass-spring model

검색결과 322건 처리시간 0.027초

Portable Calibration System for Displacement Measuring Sensors

  • Eom, Tae-Bong;Lee, Jae-Yun;Kim, Jae-Wan;Joon, Lyou
    • International Journal of Precision Engineering and Manufacturing
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    • 제7권2호
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    • pp.56-59
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    • 2006
  • A vibrational model of powder transfer equipment based on the lumped parameter method was developed, in which the operating motion consists of surging, bouncing, and pitching. After decoupling the equation of motion, the vibrational excitation source of the pitching motion was removed. So the designers are able to plan the optimum design to adjust the motion trajectory of the powder transfer equipment. That is, a procedure to adjust the motion trajectory of powder transfer equipment by changing design specifications such as the installation position, the direction of the motor, the driving speed, the mass unbalance, the stiffness coefficient, and the installation position of the support spring, is presented in this paper. The powder transfer equipment manufactured according to the results of this study did not suffer fatigue destruction, since the maximum stress on the basket structure was sufficiently small.

Program Development for Vibration Performance Evaluation of Powder Transfer Equipment

  • Lee, Hyoung-Woo;Ryu, Jeong-Hyeon;Park, Noh-Gill
    • International Journal of Precision Engineering and Manufacturing
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    • 제7권2호
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    • pp.60-65
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    • 2006
  • A vibrational model of powder transfer equipment based on the lumped parameter method was developed, in which the operating motion consists of surging, bouncing, and pitching. After decoupling the equation of motion, the vibrational excitation source of the pitching motion was removed. So the designers are able to plan the optimum design to adjust the motion trajectory of the powder transfer equipment. That is, a procedure to adjust the motion trajectory of powder transfer equipment by changing design specifications such as the installation position, the direction of the motor, the driving speed, the mass unbalance, the stiffness coefficient, and the installation position of the support spring, is presented in this paper. The powder transfer equipment manufactured according to the results of this study did not suffer fatigue destruction, since the maximum stress on the basket structure was sufficiently small.

3차원 양팔 유연 매니퓨레이터의 협조제어 (실험에 의한 검증) (Cooperative Control of Two Spatial Flexible Manipulators -Verification by Experiments-)

  • 김진수
    • 한국정밀공학회지
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    • 제17권9호
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    • pp.87-94
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    • 2000
  • In this paper we discuss the control scheme on cooperative control of two flexible manipulators working in 3D space. We propose a control scheme which consists of hybrid position/force control and vibration suppression control. Hybrid position/force control is extended from the scheme for two cooperating rigid manipulators to that for flexible ones. in addition to the control vibration suppression control based upon a lumped-mass-spring model of the flexible manipulators is applied. To illustrate the validity of the proposed control scheme we show experimental results. in the experiment a rigid object is handled by two cooperating flexible manipulators in 3D space.

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차동 기어의 진동 저감을 위한 동력 전달계 진동 해석 (Vibrational analysis of driveline for reducing differential gear vibration)

  • 최은호
    • 한국생산제조학회지
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    • 제6권3호
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    • pp.96-102
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    • 1997
  • Eigenvalue analysis of vibration mode and an analysis by frequency response among the methods of predicting gear noise are related with transmitting sound of vibration. In this study we intended to reduce the vibration noise of differential gear by reducing torque fluctuation of drive pinion shaft which causes vibration noise of differential gear in rear wheel drive vehicles. For this we developed multi-degree of freedom analysis model in which mass moment of inertia and torsional spring combined and we examined the influence of torsional vibration of driveline elements by performing forced vibration analysis of engine excitation torque. We studied the methods for reducing torsional vibration of driveline according to the design factor of propeller shaft and examined the effects reducing vibration in differential gear by applying flexible coupling.

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1차원 충돌 동역학 해석을 이용한 한국형 고속전철의 충돌사고 안전도 평가 (An Evaluation of Crashworthiness on the KHST using 1D Collision Dynamic Analysis)

  • 구정서;조현직
    • 연구논문집
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    • 통권32호
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    • pp.103-111
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    • 2002
  • In this study, the crashworthiness of KHST has been evaluated by analysing a nonlinear spring/bar-damper-mass model of 1-dimensional collision dynamics. The numerical results show that KHST can easily absorb kinetic energy at lower impact force and acceleration in heavy collisions, when compared with KTX. Also, in a Light collision like a traint-to-train accident at lower speed under 8 kph, the carbody and components of KHST can be protected without any damage except the energy absorbing tube to be replaced easily. However, KTX may be much damaged in the light collision because there is no energy absorbing tube. In conclusion, the crashworthy performance of KHST has been much improved than that of KTX, although there are something to be improved for a better crashworthy performance

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Telescopic Boom의 Stick-Slip에 의한 Cylinder의 압력변화 (Stick-Slip Pressure Variations in a Cylinder of Telescopic Boom)

  • 김신;이형직;정재연
    • Tribology and Lubricants
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    • 제18권1호
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    • pp.55-60
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    • 2002
  • In many dynamic systems, there are unwanted oscillation which may arise the reduction of performance. Especially in low sliding speed condition, the stick-slip is an important issue because it because unstable motion as well as inaccurate position control in the system. Most previous works on the stick-slip are, however, only concerned with simple modeling under the condition of constant normal force. The normal force and the amount of hydraulic oil are variable with a cylinder stroke in the telescopic boom. This paper presents the pressure variations during stick-slip with the cylinder of telescope boom. Pressure variations by stick-slip has a similar pattern to that of single mass-spring model. The stick-slip is gradually decreased by means of increased flow rate.

파라메터 변화에 강인한 Multi-Hump Convolution 입력성형기 설계 (Robust Multi-Hump Convolution Input Shaper for Variation of Parameter)

  • 박운환;이재원
    • 한국정밀공학회지
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    • 제18권5호
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    • pp.112-119
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    • 2001
  • A variety of input shaper has been proposed to reduce the residual vibration of flexible structures. Multi-hump input shaper is known to be robust for parameter variations. However, existing approach should solve the more complicated nonlinear simultaneous equations to improve the robustness of the input shaper with the additional constraints. In this paper, by proposing a graphical approach which uses convolution of shaper, the multi-hump convolution input shaper could be designed even if the constraints are added for further robustness. With a mass-damper-spring model, the better performance is obtained using the proposed new multi-hump convolution input shaper.

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개혁 미분 방정식 수업에 기반한 학습자의 고유치 고유벡터 개념 발생 및 이해 (Students' Conceptual Development of Eigenvalue and Eigenvector in Reformed Differential Equation Course)

  • 신경희
    • 한국수학사학회지
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    • 제17권4호
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    • pp.133-152
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    • 2004
  • 18세기 오일러와 베르누이에 의해 최초로 등장했던 고유치의 개념 발생의 장은 탄성을 가진 물체의 변위에 관련된 미분 방정식의 풀이 해법 문제였다. 역사 발생적 원리에 따라 용수철에 매달린 물체의 변위 문제를 모델로 개혁 미분 방정식 수업에 기반한 학습자의 고유치 고유벡터의 효과적인 개념 발생의 가능성을 논한다. 소그룹 토의 학습으로 진행된 교수 학습 모델의 실제 적용 과정과 방법, 효과적인 인지변화에 대한 교수학적 요인과 학생들의 수학에 대한 정의적 태도의 변화를 진술한다.

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

  • 박철우;주현식
    • EDISON SW 활용 경진대회 논문집
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    • 제4회(2015년)
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    • pp.246-250
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    • 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.

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차량고속주행시 차량 및 궤도거동에 미치는 궤도틀림의 영향 (Influence of track irregularity on train and track behaviours on high speed rail)

  • 이진욱;양신추;홍진완
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 1998년도 창립기념 춘계학술대회 논문집
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    • pp.307-314
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    • 1998
  • In this paper, a numerical method for analyzing the interactions between train and track is presented. The effect of track irregularity on high speed running trains and track is examined by parametric studies. Two types of vertical track irregularity are considered. The first one is ideally assumed to a sine wave to investigate train and track behaviors with the change of its shape feasibly, The second one is artificially generated from PSD of track irregularity which was established from the measured data on real railways. In the track dynamic model, rail is considered to have a distributed mass and to be supported discretely at sleepers above ballast divided into three layers. Then, the contact between wheel and rail is modeled by a nonlinear Hertzian spring.

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