Fault diagnosis of fluidic actuators

Abstract

Fluidic actuators are characterized by their rugged design and high power-to-weight ratio. They enable one to generate linear motions easily and directly by employing hydraulic cylinders and diaphragm drives. They also dissipate energy only if in dynamic operation and during holding phases generate high reaction forces with little energy consumption. Characteristics and mathematical models are treated, e.g. in [5.9], [5.13], [5.14], [5.20] and [5.21]. Methods for fault detection of two basic actuator principles, a hydraulic servo cylinder and a pneumatic diaphragm flow valve are considered in the sequel.