Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Response of shock isolators based on nonlinear stiffness and dry friction
Submission Author:
Diego Francisco Ledezma-Ramirez , Nuevo Leon , Mexico
Presenter: Diego Francisco Ledezma-Ramirez
doi://10.26678/ABCM.DINAME2017.DIN17-0001
Abstract
The use of shock isolators based on nonlinear stiffness and dry friction is discussed briefly theoretically, where the nonlinear properties is represented using the Bouc-Wen model of hysteresis. Then, the study is focused in the experimental response of cable springs, also known as wire rope isolators. Such isolators present nonlinear stiffness behaviour in different directions, i.e. tension-compression, roll and shear, as well as dry friction damping, and are known for being excellent shock isolators. Different commercially available samples are studied for several configurations and load rates. The experimental study analyzes the cyclic loading, presenting hysteresis loops and discussing the dynamic response and the stiffness and damping behaviour. Then, the shock response is investigated, where the isolators are subjected to pulses of different amplitude and duration. The advantages of the use of cable isolator over a classic linear system with viscous damping is also discussed, in terms of absolute acceleration and relative displacement response. It is found that the shock response is decreased in terms of acceleration, and that the isolation is improved for higher amplitude shocks at the cost of a higher relative motion. The use of the Bouc-Wen model is suggested for further modeling of the shock response of wire rope isolators.
Keywords
shock, dry friction, non linear stiffness, vibration isolation
