This article describes the design of a new test rig for measuring the friction force in pneumatic components and seals. The test rig was designed in order to measure both the overall friction force in a pneumatic cylinder or a valve as a whole, and the single contribution to friction force caused by the sliding seals. To this end, special fixtures and devices were designed and manufactured in o...

This study aims to develop a complex hybrid 3D robot with parallel links driven by the nonlinear pneumatic servo system for path tracking control. The mechanical system and the control system are the primary parts for developing a complex hybrid 3D robot. In the mechanical system, a complex hybrid 3D robot contains serial manipulators, parallel links, base plates, a movable platform and a pneum...

Abstract. Vertical vibrations on agricultural tractors, due to soil irregularities, represent a major cause of diseases operators. The control noise and vibration the operator is interest (Italian) National Institute for Insurance against Accidents at Work (INAIL). A prototype an active suspension system seat has been developed in laboratories INAIL. can be configured with hydraulic or pneumati...

Pneumatic servo actuators have the benefits of lowcost, cleanliness and a high power-to-weight ratio. However, their relatively poor accuracy prevents them from competing with electro-mechanical systems when higher accuracy is needed. The cause of the steady-state error for a pneumatic servo system with an open-center servo valve is investigated. Full nonlinear and linearized plant models are p...

A technique is described by which an effective stabilisation of the apical introducer sheath is achieved by a pneumatic holding arm, during transapical aortic valve implantation procedure.

This paper presents a novel bilateral control design scheme for pneumatic master-slave teleoperation systems that are actuated by low-cost solenoid valves. The motivation for using pneumatic actuators in lieu of electrical actuators is that the former has higher force to mass ratio than the latter and is inert to magnetic fields, which is crucial in certain teleoperation applications such as MR...

This paper presents a rigorous analysis and design method for PWM-based control of pneumatic systems. An equivalent analytical model incorporating the effects of a finite PWM switching period is formulated. This equivalent model was motivated by a lack of control design and analysis techniques needed to treat the inherently non-analytical switching models associated with PWM-based systems. The ...