This book is a companion text to Active Control of Sound by P.A. Nelson and S.J. Elliott, also published by Academic Press. It summarizes the principles underlying active vibration control and its practical applications by combining material from vibrations, mechanics, signal processing, acoustics, and control theory. The emphasis of the book is on the active control of waves in structures, the active isolation of vibrations, the use of distributed strain actuators and sensors, and the active control of structurally radiated sound. The feedforward control of deterministic disturbances, the active control of structural waves and the active isolation of vibrations are covered in detail, as well as the more conventional work on modal feedback. The principles of the transducers used as actuateors and sensors for such control strategies are also given an in-depth description. The reader will find particularly interesting the two chapters on the active control of sound radiation from structures: active structural acoustic control. The reason for controlling high frequency vibration is often to prevent sound radiation, and the principles and practical application of such techniques are presented here for both plates and cylinders. The volume is written in textbook style and is aimed at students, practicing engineers, and researchers.

Active control of vibration, 1st edition

Magnetic Field–Suppressed Lithium Dendrite Growth for Stable Lithium-Metal Batteries

Nonlinear vibration isolation for fluid-conveying pipes using quasi-zero stiffness characteristics

A novel quasi-zero-stiffness strut and its applications in six-degree-of-freedom vibration isolation platform

Vibration and noise control using shunted piezoelectric transducers: A review

Design and experiment of a high-static-low-dynamic stiffness isolator using a negative stiffness magnetic spring

Simulated and experimental studies on a high-static-low-dynamic stiffness isolator using magnetic negative stiffness spring

Analytical study of a quasi-zero stiffness coupling using a torsion magnetic spring with negative stiffness

A Stewart isolator with high-static-low-dynamic stiffness struts based on negative stiffness magnetic springs

The traditional tuned mass absorber is widely employed to control the vibration of a primary structure by transferring the vibrating energy to the absorber. However, the working band of the absorber is very narrow, which limits the application of broadband vibration control. This study presents a novel broadband electromagnetic absorber by first introducing two negative impedance shunts to improve broadband damping of the absorber. The electromagnetic absorber is modeled, and the corresponding electromagnetic coupling coefficient is tested. A cantilever beam is employed to verify the broadband vibration absorption of the negative resistance (NR) shunted electromagnetic absorber (NR absorber) and the negative inductance NR shunted electromagnetic absorber (NINR absorber). The governing equations of the beam with two absorbers are derived, and the experiments are set up. The results point out that the NR and NINR absorbers can attenuate the broadband vibration. The proposed absorbers do not need the feedback system and the real-time controller compared to the active absorber; hence, they have great application potential in aerospace and in submarine applications, as well as in civil and mechanical engineering.

https://iopscience.iop.org/article/10.1088/0964-1726/23/12/125044/pdf

Yajun Luo

Papers

Design and experiment of a high-static-low-dynamic stiffness isolator using a negative stiffness magnetic spring

Simulated and experimental studies on a high-static-low-dynamic stiffness isolator using magnetic negative stiffness spring

Analytical study of a quasi-zero stiffness coupling using a torsion magnetic spring with negative stiffness

A Stewart isolator with high-static-low-dynamic stiffness struts based on negative stiffness magnetic springs

Negative impedance shunted electromagnetic absorber for broadband absorbing: experimental investigation