• Title/Summary/Keyword: Dynamic response

Search Result 1,641, Processing Time 0.143 seconds

Development of automatic measurement system for dynamic respose time of pneumatic solenoid valve (공압밸브의 동적응답 특성측정 자동화 시스템 개발)

  • 강보식;김형의
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1991.10a
    • /
    • pp.974-978
    • /
    • 1991
  • Electro-pneumatic valve is an electro-mechanical device which converts electric signal into pneumatic flow mu or pressure. A measurement of dynamic response time is very important to evaluate valve performance. Dynamic response time of electro-pneumatic valve has a variation accordance with valve types, operating way and test standard. In this study, automatic measurement system of dynamic response time is composed based on test condition of dynamic response time test standard(CETOP, JIS). Also, in this study test pressure variation characteristics accordance with variation of solenoid excitation power, and we developed dynamic response measurement system enable to compare of and analyze these two characteristics.

  • PDF

Dynamic Response of Non-Uniform Beams under a Moving Mass (이동질량에 의한 불균일 단면보의 동적응답)

  • 김인우;이영신;이규섭;류봉조
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.05a
    • /
    • pp.553-556
    • /
    • 2000
  • The paper deals with the dynamic response of non-uniform beams subjected to a moving mass. In the dynamic analysis, the effects of inertia force, elastic force, centrifugal force, Coriolis force and self weight due to moving mass are taken into account. Galerkin's mode summation method is applied for the discretized equations of notion. Numerical results for the dynamic response of the non-uniform beam under a moving mass having various magnitudes and velocities are investigated. Experimental results have a good agrement with predictions

  • PDF

Analysis of the Reduction of the Dynamic Response for the CNC 5 Axles Machining Center (CNC 5축 공작기계의 동응답 저감 해석)

  • KIM, Gi Man;CHOI, Seong Dae
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.9 no.5
    • /
    • pp.83-89
    • /
    • 2010
  • In this paper, the dynamic response of a CNC 5 Axles machining center was analyzed and then controlled passively by using the dynamic absorber. For the simplification of the theoretical approach, the CNC 5 Axles machining center was modeled as a flexible beam(Bed) having a point mass(Column), two discrete systems(a Table-set and a dynamic absorber). Specifically by using the dynamic absorber, the dynamic response of a Table-set which be caused by the vibration of a flexible beam, was reduced down to the infinitesimal level. The optimal design factors of the dynamic absorber were obtained from the minimization of the cost function. It was found that the natural frequencies of a UT-380 machining center be varied due to the movement of the Table-set. In view of the dynamic response of a Table-set, the larger spring stiffness and mass of the dynamic absorber were found to give the greater reduction.

A Study on Dynamic Response Analysis Algorithm for Three Dimensional Structure (3차원 구조물의 동적응답 해석알고리즘에 관한 연구)

  • Moon, D.H.;Kang, H.S.;Choi, M.S.
    • Proceedings of the KSME Conference
    • /
    • 2000.04a
    • /
    • pp.637-642
    • /
    • 2000
  • This paper suggests new analysis algorithm for tile dynamic response of three dimensional structure which is frequently found in pipe line system of plant by the combination of the transfer stiffness coefficient method(TSCM) and Newmark method. Presented analysis algorithm for dynamic response can improve the computational accuracy remarkably owing to advantages of tile TSCM in comparison of transfer matrix method(TMM). Analysis system was modeled as a lumped mass system in this mettled. The analysis algorithm for dynamic response was formulated for the three dimensional structure. The validity of the this method is demonstrated through the results of numerical experiment for simple computational model by the TSCM and TMM.

  • PDF

Dynamic Response Analysis of a Heavy Duty Gas Turbine-Generator with Rigid Coupling Offset (고정 커플링의 오프셋을 갖는 발전용 가스터빈-발전기의 동적 응답해석)

  • Ha, Jin Woong;Jung, Dae Seok
    • The KSFM Journal of Fluid Machinery
    • /
    • v.17 no.4
    • /
    • pp.70-75
    • /
    • 2014
  • In this paper a analysis method is presented to obtain the steady state dynamic response from the finite element based equations of a rotor-bearing system with initial deflection. The method has been applied to analyze the dynamic response of the two-shaft rotor-bearing system with rigid coupling offset in a heavy duty gas turbine-generator. Bumps in the dynamic response of each rotor system have been observed at each critical speed due to the effect of initial deflection for rigid coupling offset. And, the dynamic responses have been shown to reduce for operating condition changes from cold to hot.

Dynamic response analysis for structures with interval parameters

  • Chen, Su Huan;Lian, Hua Dong;Yang, Xiao Wei
    • Structural Engineering and Mechanics
    • /
    • v.13 no.3
    • /
    • pp.299-312
    • /
    • 2002
  • In this paper, a new method to solve the dynamic response problem for structures with interval parameters is presented. It is difficult to obtain all possible solutions with sharp bounds even an optimum scheme is adopted when there are many interval structural parameters. With the interval algorithm, the expressions of the interval stiffness matrix, damping matrix and mass matrices are developed. Based on the matrix perturbation theory and interval extension of function, the upper and lower bounds of dynamic response are obtained, while the sharp bounds are guaranteed by the interval operations. A numerical example, dynamic response analysis of a box cantilever beam, is given to illustrate the validity of the present method.

Dynamic response analysis of closed loop control system for intelligent truss structures based on probability

  • Gao, W.;Chen, J.J.;Ma, H.B.;Ma, X.S.;Cui, M.T.
    • Structural Engineering and Mechanics
    • /
    • v.15 no.2
    • /
    • pp.239-248
    • /
    • 2003
  • The dynamic response analysis of closed loop control system based on probability for the intelligent truss structures with random parameters is presented. The expressions of numerical characteristics of structural dynamic response of closed loop control system are derived by means of the mode superposition method, in which the randomness of physical parameters of structural materials, geometric dimensions of active bars and passive bars, applied loads and control forces are considered simultaneously. The influences of the randomness of them on structural dynamic response are inspected by several engineering examples and some significant conclusions are obtained.

Analyses of the Cost function for the Reductions of the Dynamic Response and the Vibrational Intensity of a Discrete System and Its Elastic Supporting Beam (이산계와 탄성 지지보의 동응답 및 진동 인텐시티 저감을 위한 목적함수 해석)

  • Kim, Gi-Man;Choi, Seong-Dae
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.20 no.1
    • /
    • pp.83-91
    • /
    • 2010
  • In this paper, the feasibility of the cost function having two control factors were discussed in compared to two others which has one different control factor respectively. As of the control factors, the dynamic response of a discrete system and the vibrational intensity at the reference point which is the connecting point of a discrete system to a flexible beam were controlled actively by the control force obtained from the minimization of the cost function. The method of feedforward control was employed for the control strategy. The reduction levels of the dynamic response of a discrete system and the vibrational intensity at a reference point, and also the input power induced by the control force were evaluated numerically in cases of the three different cost functions. In comparison with the results obtained from the cost functions of one control factor, which is the dynamic response or the vibrational intensity, in most cases of the cost function of two control factors the better or similar results were obtained. As a conclusion, it is surely noted that both the dynamic response and the vibrational intensity of the vibrating system be controlled up to the expected level by using the single cost function having two control factors.

Dynamic Response Characteristics for Two-layered Trackbed Structure by Train Load (열차하중에 의한 이층노반구조의 동적 응답특성)

  • Lee, Il-Wha
    • Journal of the Korean Society for Railway
    • /
    • v.14 no.2
    • /
    • pp.160-166
    • /
    • 2011
  • It is difficult to clarify the dynamic response characteristics of trackbed because of various environmental conditions. However, track irregularity be affected by ununiformed bearing capacity and its dynamic response, study for dynamic response characteristics is required to investigate the cause of track irregularity and countermeasure. In this paper, the response variation for dominant frequency and vibration energy by trackbed structure and material stiffness are investigated. The analysis section is two layered ground structure that is comprised of trackbed and soft rock. This structure amplifies the energy of dominant range easily. It is evaluated to affect track irregularity on comparing by theoritical, analytical and empirical method for dynamic response of the trackbed.