Abstract
A hydraulic composite actuator is developed for vibration simulation. The hydraulic scheme and control principle are introduced and an open–closed-loop iterative learning control method is proposed for control issue. A special composite cylinder controlled by servo valve and proportional relief valve is designed to generate static force with large amplitude and dynamic force with small amplitude but high frequency. The control subsystem for dynamic force is a zero-type system with very high open-loop gain and uncertainty of parameters; therefore, an open–closed-loop proportional–derivative-type iterative learning control scheme is designed to solve this challenging control issue. A principle prototype of this hydraulic has been developed, and the experiments have been designed for this actuator. Different control methods are experimented for verification and comparison, and experiment results have verified practical applicability of this actuator and the superiority of control scheme.
Highlights
Vibration simulation has been applied in the fields of the aspects of aeronautics, astronautics, national defense, and so on.[1]
A hydraulic composite actuator is developed for vibration simulation
A special composite cylinder controlled by servo valve and proportional relief valve is designed to generate static and dynamic tensional force, and the open–closed-loop iterative learning control (ILC) method is proposed to achieve high-precision control performance for this vibration actuator
Summary
Vibration simulation has been applied in the fields of the aspects of aeronautics, astronautics, national defense, and so on.[1]. By simulating the particular vibration environment that products will exposed to in use, transform, and storage, the weakness of design can be early found and the information for correcting design can be obtained in time.[2]. The vibration simulation is normally produced by hydraulic actuator (cylinder or motor) or electric motor to generate different kinds of vibration forces.[3] Compared with other types of drives, hydraulic drive has many distinct advantages, such as high power mass ratio and stiffness, fast response, high control precision, compactness, and high payload capability.[4] With the increasing demand for vibration test, the vibration actuators with higher vibration power and control performance are demandingly required. Hydraulic drive, especially electro-hydraulic drive, has been widely applied in the vibration simulation.[5]
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