Skyhook

Skyhook

A skyhook is a mechanical system that consists of a vertically oriented cable attached to a pivoting arm. It is used in vehicle suspension systems to reduce the resonant peak of the sprung mass and improve ride quality by adjusting the skyhook damping coefficient based on changes in vehicle body velocity and other conditions. Skyhook control provides improved reduction of car-body bending and lower vibration levels in the 14-20 Hz frequency range compared to passive damping systems.From: Unmanned Aerial Remote Sensing [2020], Computational Intelligence Assisted Design [2018], Modelling, hardware-in-the-loop tests and numerical simulation of magneto-rheological semi-active primary suspensions in a railway vehicle [2023]

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Purchase Book

Published in D.A. Bradley, N.C. Burd, D. Dawson, A.J. Loader, Mechatronics, 2018

D.A. Bradley, N.C. Burd, D. Dawson, A.J. Loader

Individual mechanisms will require grounding with respect to the actuator or load, and will normally use the structure to maintain accurate travel by ensuring that the loads are transferred, through a path whose characteristics, such as stiffiness, are know. ‘Skyhooks’ are not found in successful engineering!

Modelling, hardware-in-the-loop tests and numerical simulation of magneto-rheological semi-active primary suspensions in a railway vehicle

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Journal Information

Published in Vehicle System Dynamics, 2023

Bin Fu, Egidio Di Gialleonardo, Binbin Liu, Stefano Bruni

HIL tests for the damper controlled according to the Skyhook control scheme were performed using different control gain . Figure 10(a) compares the PSDs of the acceleration of the car-body mass for two different gains, 40 and 60 kNs/m respectively, and also for the case in Passive on mode as well as the passive vehicle. Using a higher control gain results in improved mitigation of car-body vibration at 11.8 Hz but also leads to larger vibration above 14 Hz. Other gain values were tested, but the two ones for which results are shown in the figure were found to provide a better trade-off between the mitigation of the resonance peak and avoiding too much increase of vibration at higher frequencies. From the same figure, the advantage of Skyhook control with respect to Passive on operation of the damper is observed: Skyhook control provides improved reduction of car-body bending and, at the same time, lower vibration levels in the 14–20 Hz frequency range.

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Modelling, hardware-in-the-loop tests and numerical simulation of magneto-rheological semi-active primary suspensions in a railway vehicle