ON-LINE HARMONIC FORCE ESTIMATION IN ACTIVE VIBRATION CONTROL OF MASS-SPRING-DAMPER SYSTEMS

摘要

An on-line algebraic estimation approach of harmonic forces is proposed for a class of multiple degrees-of-freedom linear mass-spring-damper mechanical systems. The amplitude, frequency and phase parameters of the excitation signals are firstly estimated and the harmonic forces are then reconstructed. Force estimation is performed using measurements of position output variables. An active vibration control scheme is also introduced for harmonic vibration attenuation and asymptotic tracking tasks of reference trajectories planned for the harmonically perturbed vibrating mechanical system. Some numerical results are presented to show the effectiveness of the on-line force estimation and the control scheme when the system is subjected to resonant harmonic vibrations.