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A high speed painting automizor system with elastic support is presented. Experimental tests of the system including the key part, the rotor-bearing system, were conducted using the experimental modal method under various working conditions. The natural frequency of the system is. given and the relationship between the bearing stiffness and the natural frequency and amplitude are studied. Fault of the bearing GCr15 is analyzed. The experiment has three parts including the experimental theory, experimental design, and experimental data processing. The results will lay a solid foundation for further investigation on dynamic design, maintenance, working condition monitoring and fault detection of the painting automizor system.

A high speed painting automizor system with elastic support is presented. Experimental tests of the system including the key part, the rotor-bearing system, were conducted using the experimental modal method under various working conditions. The natural frequency of the system is. given and the relationship between the bearing stiffness and the natural frequency and amplitude are studied. Fault of the bearing GCr15 is analyzed. The experiment has three parts including the experimental theory, experimental design, and experimental data processing. The results will lay a solid foundation for further investigation on dynamic design, maintenance, working condition monitoring and fault detection of the painting automizor system.

A high speed painting automizor system with elastic support is presented. Experimental tests of the system including the key part, the rotor-bearing system, were conducted using the experimental modal method under various working conditions. The natural frequency of the system is. given and the relationship between the bearing stiffness and the natural frequency and amplitude are studied. Fault of the bearing GCr15 is analyzed. The experiment has three parts including the experimental theory, experimental design, and experimental data processing. The results will lay a solid foundation for further investigation on dynamic design, maintenance, working condition monitoring and fault detection of the painting automizor system.

The difficulty in creating high-quality joints in high-strength/high-temperature materials for aerospace applications fostered the interest in solid-state friction-based joining techniques. Among these, inertia friction welding (IFW) found numerous industrial applications to join axisymmetric components since highly repeatable and fully automated, does not require filler material, shielding gas or vacuum, produces a small heat-affected zone and is not affected by bulk melting. Two workpieces, one rotating and the other stationary, are pressed together and the frictional heat generated at the weld interface causes a localised plastic deformation and their junction. IFW found large interest among researchers and several studies focused on the modelling of the thermo-mechanical evolution of the joint to predict the welding response to changes in process parameters. To cope with the complexity of the phenomena occurring during welding, these models usually rely on simplifications in term of weld geometry, alignment and interaction between the workpieces, machine behaviour, process loads and clamping conditions. In addition, despite many studies showed that dynamic effects can deeply affect the process evolution and the quality of the outcomes in manufacturing processes that share similarities with IFW, no study presented a satisfactory dynamic analysis of IFW. To fill these research gaps, three main objectives were addressed: (i) development of a novel monitoring system for the in-process characterisation of the IFW machine that can act as a diagnostic tool; (ii) investigate the machine response to the process conditions and assess the validity of the axisymmetric assumption conventionally adopted to study IFW; (iii) modelling the effect of the imperfect contact between the workpieces on the pressure distribution at the weld interface and the dynamic behaviour of the system. The monitoring system developed is a significant step forward from the existing systems. In fact