Vertical vibration control of an in‐wheel motor‐driven electric vehicle using an in‐wheel active vibration system

2018 ◽  
Vol 22 (2) ◽  
pp. 879-896 ◽  
Author(s):  
Ren He ◽  
Jun‐Cheng Wang
Keyword(s):  
Vibration Control ◽  
Electric Vehicle ◽  
Vertical Vibration ◽  
Vibration System ◽  
Active Vibration

Control and Simulation on Vertical Vibration of Subway Rail via Magnetorheological Isolators

2012 ◽  
Vol 482-484 ◽  
pp. 1313-1316
Author(s):  
Rui Li ◽  
Li Min He ◽  
Xue Qin Li ◽  
Ke Long Chen
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration System ◽  
Medium Frequency ◽  
Slab Track ◽  
Vibration Model ◽  
Active Vibration ◽  
Force Transmissibility ◽  
Stiffness Characteristics ◽  
Isolation Performance

A semi-active vibration system via magnetorheological (MR) isolators can contribute to enhance isolation performance. In this study, a vertical vibration model of subway rail via MR isolators was proposed. The adjustable damping and stiffness characteristics of isolator were also analyzed. Based on a floating slab track (FST) isolation model, a variable domain fuzzy control system was proposed to decrease the vertical vibration force. The results simulated in MATLAB indicate that compared with passive isolators, FST system via MR isolators decease vertical vibration force transmissibility ratio to 40% at low frequency (15Hz) and to 31% at medium frequency (30Hz).

scholarly journals Active Airframe Vibration Control Simulations of Lift-offset Compound Helicopters in High-Speed Flights

2021 ◽  
Vol 24 (4) ◽  
pp. 357-367
Author(s):  
Sung-Boo Hong ◽  
Young-Min Kwon ◽  
Ji-Su Kim ◽  
Yu-Been Lee ◽  
Byeong-Hyeon Park ◽  
...  
Keyword(s):  
Vibration Control ◽  
High Speed ◽  
Active Vibration Control ◽  
Vertical Vibration ◽  
Lms Algorithm ◽  
Element Analysis ◽  
Coaxial Rotor ◽  
The Finite Element Analysis ◽  
Vibration Responses ◽  
Active Vibration

This paper studies the simulations of active airframe vibration controls for the Sikorsky X2 helicopter with a lift-offset coaxial rotor. The 4P hub vibratory loads of the X2TD rotor are obtained from the previous work using a rotorcraft comprehensive analysis code, CAMRAD II. The finite element analysis software, MSC.NASTRAN, is used to model the structural dynamics of the X2TD airframe and to analyze the 4P vibration responses of the airframe. A simulation study using Active Vibration Control System(AVCS) with Fx-LMS algorithm to reduce the airframe vibrations is conducted. The present AVCS is modeled using MATLAB Simulink. When AVCS is applied to the X2TD airframe at 250 knots, the 4P longitudinal and vertical vibration responses at the specified airframe positions, such as the pilot seat, co-pilot seat, engine deck, and prop gearbox, are reduced by 30.65 ~ 94.12 %.

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