Controlling the Longitudinal Vibration of an Elastic Rod within a Wide Frequency Band by Utilizing an Adjustable Stiffness Internal Support

• An adjustable stiffness internal support is designed and validated to control longitudinal vibration of elastic rods over a wide frequency band. • The stiffness coefficients of the support can be effectively controlled, enabling variable stiffness vibration control. • Experiments confirm that the adjustable support restricts longitudinal vibration within a wide frequency band, demonstrating the existence of an adjustable working region. • The study provides practical insights for applying variable stiffness vibration control theory to elastic rods in engineering applications.