#structural damping

• Vibration dampener — A device, component, or material used for absorbing, dampening, or eliminating vibrations, tremors, and mechanical shock waves produced by machinery, engines, pipes, or sports equipment. In mechanics, it protects structures against material fatigue; in sports (e.g., tennis), it is a small silicone piece placed between the racket strings to reduce shocks transmitted to the player's arm.
• Aperiodic — Not periodic; a phenomenon, movement, or oscillation that does not repeat at equal intervals of time. In physics and engineering, the term describes a damping motion so powerful that the system returns to its equilibrium position without performing any actual oscillation.