Model Based Control of a Multi-Axis Hydraulic Shaker using Experimental Modal Analysis

This paper describes the development of a decoupling vibration control system for a multi-axis hydraulic shaker facility. The control system is based on the Internal Model Control (IMC) architecture. While an accurate model of the hydraulic subsystem should only be identified once, there is a strong need for a systematic procedure for identifying the mechanical subsystem. Based on the PolyMAX identification method, an accurate mechanical model can be obtained through experimental modal analysis. In a simulation analysis, the resulting PolyMAX-IMC control system has proven to achieve an improved performance regarding reference tracking, limited time harmonic distortion and cross-talk reduction.