Theoretical analysis of a multi-layered thin shell coupled with piezoelectric shell actuators for distributed vibration controls

Active vibration isolation by polymeric piezoelectret with variable feedback gains

Free and forced vibrations of a restrained uniform beam carrying an intermediate lumped mass and a rotary inertia

Active vibration isolation and excitation by piezoelectric slab with constant feedback gains

High-precision and high-speed machine operation is very much in demand in modern manufacturing industry. However, mechanical vibrations introduced by various sources can easily disrupt this operation. Thus, vibration isolation and control have become very important in high-precision machine operation. This paper presents an active micro-position control technique using a piezoelectric actuator. A general theory for a piezoelectric actuator subjected to mechanical excitations and feedback voltages is developed. Piezoelectric excitation induced by the converse piezoelectric effect via direct voltage injection is first studied. Then, this electromechanical phenomenon is applied to an active micro-position control by injecting a processed feedback voltage at variable feedback gains into the piezoelectric actuator counteracting the external excitation. The effectiveness of the piezoelectric micro-position attenuation is evaluated analytically and experimentally. The theoretical solutions are compared favourably with the laboratory experimental data.

Design of a piezoelectric exciter/actuator for micro-displacement control: theory and experiment

Reduction des vibrations d'une structure formee de poutres avec un amortisseur electromagnetique asservi en vitesse. Reponse a un choc

Vibration Control for a Beam Structure Using an Electromagnetic Damper with Velocity Feedback : 2nd Report, Shock Response

In the present report, the forced vibration response of a beam structure having an electromagnetic damper with velocity feedback is investigated theoretically and experimentally The beam structure is subjected to a harmonic exciting force, and the vibrations are controlled by the electromagnetic damper consisting of an electromotive linear actuator and a velocity sensor using rare-earth magnets as well as control circuit In the analysis, the simultaneous equations under Bernoulli-Euler bending theory in consideration of both the beam structure and the control system are solved exactly Furthermore, the effects of the amplifier gain of the control system upon the vibration control efficiency and the response of the system are clarified

Humihiko NIlYAMA

Papers

Vibration Control for a Beam Structure Using an Electromagnetic Damper with Velocity Feedback : 2nd Report, Shock Response

Vibration Control for a Beam Structure Using an Electromagnetic Damper with Velocity Feedback : 1st Report, Forced Vibration Response

Vibration Control for a Beam Structure Using an Electromagnetic Damper with Velocity Feedback : 2nd Report, Shock Response