Artificial Neural Networks offer an efficient platform for devising condition monitoring strategies in machinery and plants where the number of components and processes are too many and complex to be mathematically modeled appropriately. This paper describes a study on integration of Neural Networks techniques with PC based data acquisition for development of an automated strategy for fault ide...

Disk unbalance in rotating shaft of machines is a common problem. Direct measurement of unbalance forces due to disk unbalance is not possible, therefore, usually the unbalance forces are predicted via response measurements. In the present work, a model-based approach with joint input-state (JIS) estimation technique to detect the amount of unbalance present in a disc is proposed. The JIS techn...

Continuous rubbing between the shaft and surrounding seals or end-glands of electricity generating turbine units can escalate into very severe vibration and costly rotor damage. Therefore such rotor–stator contacts require early diagnosis so as to minimize the financial consequences of any unplanned shutdowns. Acoustic emissions (AEs) or stress wave monitoring at the bearings has been identifie...

The unbalanced exciting force of high-speed rotary asymmetric rotor equipment is the main factor causing vibration. In order to effectively suppress vibration equipment, paper establishes a multistage coaxial measurement stacking method that minimizes force. By analyzing propagation process centroid assembly and relationship between geometric center single rotor, model based on established. gen...

This paper presents the interaction between blade vibration and part-span rotating stall in a multi-stage high speed compressor. Unsteady aerodynamic aeroelastic simulations were conducted using URANS CFD. Steady state computations showed short length scale disturbances formed local to tip of front stage rotor. Using full annulus model, these shown coalesce into flow structures around at approx...

Master-slave active robot hands and endoscopes, which provide dexterous manipulations and wide views like human hands and eyes, are required to be constructed. We have previously developed a multi-DOF ultrasonic motor consisting of a spherical rotor and a bar-shaped stator. The rotor rotates around three perpendicular axes using three natural vibration modes of the stator. In this study, a mult...

This paper presents the development of a mixed-variable optimization framework for the aeroelastic analysis and design of active twist rotors. Proper tailoring of the blade properties can lead to the maximization of the active twist and the control authority for vibration reduction under operating conditions. Thus, using mathematical optimization, the crosssectional layout is designed using con...

This paper is concerned with modeling and active vibration control of a 1.23-m long flexible shaft on active magnetic bearings that is designed to model a small industrial compressor and to serve as a platform for investigating emerging control schemes. Aerodynamic cross-coupled stiffness is one of the main contributors to rotordynamic instability in modern turbo-machines. The destabilizing eff...

This paper presents a method to monitor and analyze the vibration of induction machine due to the rotor imbalance. A novel health monitoring system of electric machine based on wireless sensor network (ZigBeeTM) is developed in this paper. The communication protocol and software design for both wireless sensor network node and base station are also presented in detail. Moreover, the positioning...