Abstract
It is of great significance to develop the high- precision and high-reliability hydraulic force servo control system to promote the application of hydraulic fatigue machine in the field of structural and machine parts fatigue testing. The dynamic characteristics considering the variation of load stiffness is analyzed by establishing the model of hydraulic fatigue machine. The dual inertia loop is adopted to enhance the stability of the force control system of the fatigue testing machine. For the sinusoidal force loading signal, an adaptive amplitude and phase control algorithm is proposed to improve the sinusoidal force tracking accuracy in spite of the existence of parameter uncertainties and nonlinearities of the hydraulic system. The digital control system of fatigue machine is built based on xPC rapid prototyping method. The experimental results show the effectiveness and real-time of the proposed control algorithm mentioned above.
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