• Title/Summary/Keyword: ARMAX(Auto Regressive moving average eXogenous)

Search Result 3, Processing Time 0.014 seconds

Discrete Time Modeling of the Front Suspension System with Nonlinearity (비선형성을 갖는 전륜 현가장치의 이산시간 모델링)

  • 이병림;이재응
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.8 no.6
    • /
    • pp.156-164
    • /
    • 2000
  • In this study, a discrete time model for a simplified front wheel suspension system which has nonlinear dampling and stiffness property is introduced. The model is estimated from the discrete data which are generated based on the real car parameter. The performance of the proposed method is evaluated through numerical simulation, and the simulation results show that the proposed method can estimate the nonlinear behavior of the suspension system very well.

  • PDF

Damage assessment of shear-type structures under varying mass effects

  • Do, Ngoan T.;Mei, Qipei;Gul, Mustafa
    • Structural Monitoring and Maintenance
    • /
    • v.6 no.3
    • /
    • pp.237-254
    • /
    • 2019
  • This paper presents an improved time series based damage detection approach with experimental verifications for detection, localization, and quantification of damage in shear-type structures under varying mass effects using output-only vibration data. The proposed method can be very effective for automated monitoring of buildings to develop proactive maintenance strategies. In this method, Auto-Regressive Moving Average models with eXogenous inputs (ARMAX) are built to represent the dynamic relationship of different sensor clusters. The damage features are extracted based on the relative difference of the ARMAX model coefficients to identify the existence, location and severity of damage of stiffness and mass separately. The results from a laboratory-scale shear type structure show that different damage scenarios are revealed successfully using the approach. At the end of this paper, the methodology limitations are also discussed, especially when simultaneous occurrence of mass and stiffness damage at multiple locations.

Self-Tuning Controller design for the motion control of a Single Rod Hydraulic Cylinder (편로드 유압실린더의 운동제어를 위한 자기동조 제어기설계)

  • 김정태;김문생
    • Journal of KSNVE
    • /
    • v.8 no.3
    • /
    • pp.441-449
    • /
    • 1998
  • A self-tuning control scheme, incorporated with the simplified 1st-order ARMAX(Auto-Regressive Moving Average eXogenous) model, for single rod hydraulic cylinder which has varying dynamic characteristics is presented here. An adaptive controller is developed for the system that uses feedforward and optimal feedback control for simultaneous parameter identification and tracking control. Through experimental results, the performance comparison of the self-tuning controller with a fixed gain proportional controller clearly shows its superior ability in handling load changes in quiescent states.

  • PDF