Dynamic-Breakdown of the Ball-Screw Inerter in ISD System

Inerter is a novel type of mechanical element. As the important composition of vibration control systems, inerters are widely used. Meanwhile, the operation security issue of the inerter is becoming increasingly prominent. Dynamic-breakdown of the inerter (DBoI) means that the inerter's two terminals come into contact, which can cause a huge impact force and destroy the system. The ball-screw inerter is an essential protype of inerters. The existence of dynamic-breakdown of a single inerter has been already proved by previous research. To confirm whether DBoI exists in the inerter-spring-damper (ISD) system, the research focuses on the dynamic-breakdown of a ball-screw inerter (DBoBSI) in the ISD system. The dynamic model of the DBoI in the ISD system is established and analyzed. On account of the model and analysis, DBoBSI is analyzed. A novel experimental system is established and experiments of DBoBSI in the ISD system are carried out. The coefficient of restitution e(t) changes slightly with a value of about 0.5. The variation of momentum is nearly equal to the impulse, with an error within 15%. On account of the experimental data collected, the conclusions are that there is a DBoBSI in the ISD system, and the impact force during DBoI in the ISD system ought to be avoided.