This paper presents a localized mechanical fault detection method using spectral identification t... more This paper presents a localized mechanical fault detection method using spectral identification techniques. Two algorithms are evaluated, the Levenberg-Marquardt algorithm which is an iterative Nonlinear Programming algorithm and the ESPRIT algorithm based on parameter estimation via Rotational Invariance Techniques. A reduced frequency model is used to provide a very accurate estimation of the fault and to significantly reduce the calculation time. A dedicated experimental setup based on a novel mechanical fault emulator and a 7.8kW PMSM drive is designed to validate the proposed approach. The experimental results show that the proposed technique is effective to detect single mechanical fault signatures by evaluating a simple online fault indicator and it proves also its ability to detect early mechanical faults. Finally, a critical comparison has been made in order to evaluate their performance in terms of calculation time, complexity, advantages and drawbacks.
We present in this paper an experimental and numerical study about the Coanda effect which causes... more We present in this paper an experimental and numerical study about the Coanda effect which causes the sudden reattachment of a jet to an inclined plane. This phenomenon induces a large hysteresis loop, which can be used to reduce the noise produced by an airflow crossing two diaphragms in tandem inside a duct. The angle of the inclined wall with horizontal plane and the flow velocity are the two main parameters studied here. With the aim of doing optimal control, we propose to construct for this flow configuration a low-dimensional dynamical system with a basis issued from a Proper Orthogonal Decomposition.
The experimental application of the momentum equation to the fluid bounding a cylinder placed nea... more The experimental application of the momentum equation to the fluid bounding a cylinder placed near a wall in waves gives a good evaluation of the lift force on the cylinder. The force induced by circulation can be isolated in the equation and its experimental evaluation reveals that the stationary part of the force induced by circulation is the major contribution to the lift force
This paper presents a localized mechanical fault detection method using spectral identification t... more This paper presents a localized mechanical fault detection method using spectral identification techniques. Two algorithms are evaluated, the Levenberg-Marquardt algorithm which is an iterative Nonlinear Programming algorithm and the ESPRIT algorithm based on parameter estimation via Rotational Invariance Techniques. A reduced frequency model is used to provide a very accurate estimation of the fault and to significantly reduce the calculation time. A dedicated experimental setup based on a novel mechanical fault emulator and a 7.8kW PMSM drive is designed to validate the proposed approach. The experimental results show that the proposed technique is effective to detect single mechanical fault signatures by evaluating a simple online fault indicator and it proves also its ability to detect early mechanical faults. Finally, a critical comparison has been made in order to evaluate their performance in terms of calculation time, complexity, advantages and drawbacks.
We present in this paper an experimental and numerical study about the Coanda effect which causes... more We present in this paper an experimental and numerical study about the Coanda effect which causes the sudden reattachment of a jet to an inclined plane. This phenomenon induces a large hysteresis loop, which can be used to reduce the noise produced by an airflow crossing two diaphragms in tandem inside a duct. The angle of the inclined wall with horizontal plane and the flow velocity are the two main parameters studied here. With the aim of doing optimal control, we propose to construct for this flow configuration a low-dimensional dynamical system with a basis issued from a Proper Orthogonal Decomposition.
The experimental application of the momentum equation to the fluid bounding a cylinder placed nea... more The experimental application of the momentum equation to the fluid bounding a cylinder placed near a wall in waves gives a good evaluation of the lift force on the cylinder. The force induced by circulation can be isolated in the equation and its experimental evaluation reveals that the stationary part of the force induced by circulation is the major contribution to the lift force
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