Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.

Support Vector Machine Based Bearing Fault Diagnosis for Induction Motors Using Vibration Signals

Abstract: In this paper, we propose a new method for detecting bearing faults using vibration signals. The proposed method is based on support vector machines (SVMs), which treat the harmonics of fault-related frequencies from vibration signals as fault indices. Using SVMs, the cross-validations are used for a training process, and a two-stage classification process is used for detecting bearing faults and their status. The proposed approach is applied to outer-race bearing fault detection in threephase squirrel-cage induction motors. The experimental results show that the proposed method can effectively identify the bearing faults and their status, hence improving the accuracy of fault diagnosis.

A fault-tolerant control strategy for non-linear discrete-time systems: application to the twin-rotor system

Abstract: In this paper, an active fault-tolerant control scheme is proposed in the case of actuator faults. In particular, the general idea of integrating fault identification and control schemes, which takes into account the fault estimation error is first presented in a linear context. As a result, the so-called separation principle for the controller and the fault identification scheme is developed. Subsequently, the proposed approach is extended to a class of non-linear systems. Similarly to the linear case, it is proven that using a suitable control strategy and a faulty identification scheme it is possible to obtain an integrated fault-tolerant control framework, which takes into account the fault identification error. As a result, a non-linear counterpart of the above-mentioned separation principle is developed. Finally, the last part of the paper shows the application results obtained using a twin-rotor system that confirm the high performance of the proposed approach.

Performance Evaluation of FMOSSIM, a Concurrent Switch-Level Fault Simulator

Abstract: This paper presents measurements obtained while performing fault simulations of MOS circuits modeled at the switch level. In this model the transistor structure of the circuit is represented explicitly as a network of charge storage nodes connected by bidirectional transistor switches. Since the logic model of the simulator closely matches the actual structure of MOS circuits, such faults as stuck-open and closed transistors as well as short and open-circuited wires can be simulated. By using concurrent simulation techniques, we obtain a performance level comparable to fault simulators using logic gate models. Our measurements indicate that fault simulation times grow as the product of the circuit size and number of patterns, assuming the number of faults to be simulated is proportional to the circuit size. However, fault simulation times depend strongly on the rate at which the test patterns detect the faults.

A New Fault Diagnosis and Prognosis Technology for High-Power Lithium-Ion Battery

Abstract: A fault diagnostic approach for lithium-ion battery is proposed in this paper, which is suitable for high-power applications such as hybrid electrical vehicle and electromagnetic launch A serial of abusive experiments including overcharge, over-discharge, and low-temperature operation, which commonly occur during high-power applications, are arranged in order to extract corresponding features Fault feature vector in the form of electrical parameter variation and incremental capacity analysis curve variation is obtained through reference test The results from the tests are synthesized to establish the diagnosis system based on fuzzy logic, which provides a detailed description for the fault symptoms and connects them with internal fault mechanisms

Method of finding faults in a branched electrical distribution circuit

Abstract: A PN modulated signal is applied to an end of a network electrical distribution circuit The signal produces a snapshot trace of energy reflected from various discontinuities along the circuit, including a fault Because the fault absorbs a large part of the energy in the applied signal, reflections from discontinuities in the same branch as the fault but farther from the input are reduced in amplitude By knowing the position of the branches and various discontinuities, such as transformers, the position of the fault can be logically determined If the fault is a high resistance fault a high voltage pulse is applied to the end of the circuit The PN signal is initially sensed at a time when the fault has a low resistance because of arcing due to the high voltage pulse