Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Timo Manninen Name of the doctoral dissertation Fault Simulator and Detection for a Process Control Valve Publisher School of Engineering Unit Department of Engineering Design and Production Series Aalto University publication series DOCTORAL DISSERTATIONS 146/2012 Field of research Machine technology Manuscript submitted 12 J...

The goal of this internal report is to summarize the experiences with the fault injector based on the Unix ptrace function. It should be explained how to use the fault injector for special experiments and how to interpret the results. In the first chapter (" ptrace(2) Interface ") an overview on the facilities of the Unix ptrace interface is given to see what faults/errors may be simulated by t...

In this paper, we propose an optimal fault tolerant broadcasting algorithm which requires only n + 1 steps for an SIMD hypercube with up to n-1 faulty nodes. The basic idea of the proposed algorithm is first to find a fault-free subcube (CS) which contains the source node (S) such that each neighboring subcube of the subcube CS contains at least one fault. N e d , the message is broadcast along...

Power transformers in transmission network are utilized for increasing or decreasing the voltage level. Power Transformers fail to connect directly to the consumers that result in the less load fluctuations. Power transformer operation under any abnormal condition decreases the lifetime of the transformer. Power Transformer protection from inrush and internal fault is critical issue in power sy...

Software almost inevitably contains defects. Do everything possible to reduce the fault rate; Use faulttolerance techniques to deal with software faults. Fault tolerance is the ability of a system to perform its function correctly even in the presence of internal faults. Most of the ordinary systems lack fault tolerant software fix. This paper surveys various software Fault Tolerance techniques...

This paper presents a signal analysis technique for internal combustion (IC) engine fault diagnosis based on the spectrogram and artificial neural network (ANN). Condition monitoring and fault diagnosis of IC engine through acoustic signal analysis is an established technique for detecting early stages of component degradation. The location dependent characteristic fault frequencies make it pos...

Fault tree technique has been used in industry for safety analysis of safety critical systems for decades. They can be used for analysing the safety of both software and hardware. However, there are a lot of problems in ensuring the internal consistency and validity of fault trees constructed due to the absence of appropriate approach of using fault tree technique. This paper describes a model-...

An algorithmic fault detection scheme for linear digital state variable systems is proposed. The proposed scheme eliminates the necessity of observing the internal states of the system for concurrent fault detection by utilizing an accumulation-based approach. Observation merely of the inputs and the outputs results in significantly reduced area overhead and no performance penalty. Experimental...

This paper proposes a novel scheme for detecting and classifying faults in stator windings of a synchronous generator (SG). The proposed scheme employs a new method for fault detection and classification based on Support Vector Machine (SVM). Two SVM classifiers are proposed. SVM1 is used to identify the fault occurrence in the system and SVM2 is used to determine whether the fault, if any, is ...

In this paper we present the specification backpropagation technique which enables one to derive the constraint of an internal functional block with respect to a given DC specification for an analog/mixed-signal system. Based on this technique, we implement an efficient fault simulator which reduces the required efforts by (1) removing undetectable faults from the fault list, and (2) performing...