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Total 131 records

    Fault-resilient lightweight cryptographic block ciphers for secure embedded systems

    , Article IEEE Embedded Systems Letters ; Vol. 6, issue. 4 , 2014 , pp. 89-92 ; ISSN: 19430663 Mozaffari Kermani, M ; Tian, K ; Azarderakhsh, R ; Bayat Sarmadi, S ; Sharif University of Technology
    Abstract
    The development of extremely-constrained embedded systems having sensitive nodes such as RFID tags and nanosensors necessitates the use of lightweight block ciphers. Nevertheless, providing the required security properties does not guarantee their reliability and hardware assurance when the architectures are prone to natural and malicious faults. In this letter, error detection schemes for lightweight block ciphers are proposed with the case study of XTEA (eXtended TEA). Lightweight block ciphers such as XTEA, PRESENT, SIMON, and the like might be better suited for low-resource deeply-embedded systems compared to the Advanced Encryption Standard. Three different error detection approaches... 

    Low-cost scan-chain-based technique to recover multiple errors in TMR systems

    , Article IEEE Transactions on Very Large Scale Integration (VLSI) Systems ; Volume 21, Issue 8 , 2013 , Pages 1454-1468 ; 10638210 (ISSN) Ebrahimi, M ; Miremadi, S. G ; Asadi, H ; Fazeli, M ; Sharif University of Technology
    2013
    Abstract
    In this paper, we present a scan-chain-based multiple error recovery technique for triple modular redundancy (TMR) systems (SMERTMR). The proposed technique reuses scan-chain flip-flops fabricated for testability purposes to detect and correct faulty modules in the presence of single or multiple transient faults. In the proposed technique, the manifested errors are detected at the modules' outputs, while the latent faults are detected by comparing the internal states of the TMR modules. Upon detection of any mismatch, the faulty modules are located and the state of a fault-free module is copied into the faulty modules. In case of detecting a permanent fault, the system is degraded to a... 

    ScTMR: A scan chain-based error recovery technique for TMR systems in safety-critical applications

    , Article Proceedings -Design, Automation and Test in Europe, DATE, 14 March 2011 through 18 March 2011 ; March , 2011 , Pages 289-292 ; 15301591 (ISSN) ; 9783981080179 (ISBN) Ebrahimi, M ; Miremadi, S. G ; Asadi, H ; Sharif University of Technology
    2011
    Abstract
    We propose a roll-forward error recovery technique based on multiple scan chains for TMR systems, called Scan chained TMR (ScTMR). ScTMR reuses the scan chain flip-flops employed for testability purposes to restore the correct state of a TMR system in the presence of transient or permanent errors. In the proposed ScTMR technique, we present a voter circuitry to locate the faulty module and a controller circuitry to restore the system to the fault-free state. As a case study, we have implemented the proposed ScTMR technique on an embedded processor, suited for safety-critical applications. Exhaustive fault injection experiments reveal that the proposed architecture has the error detection and... 

    Functional observer design with application to pre-compensated multi-variable systems

    , Article 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings, 21 September 2015 through 23 September 2015 ; 2015 , Pages 620-625 ; 9781479977871 (ISBN) Nazmi, S ; Mohajerpoor, R ; Abdi, H ; Nahavandi, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2015
    Abstract
    Partial state estimation of dynamical systems provides significant advantages in practical applications. Likewise, pre-compensator design for multi variable systems invokes considerable increase in the order of the original system. Hence, applying functional observer to pre-compensated systems can result in lower computational costs and more practicability in some applications such as fault diagnosis and output feedback control of these systems. In this note, functional observer design is investigated for pre-compensated systems. A lower order pre-compensator is designed based on a H2 norm optimization that is designed as the solution of a set of linear matrix inequalities (LMIs). Next, a... 

    Sliding Mode Observers to Detect and Isolate Faults in a Turbocharged Gasoline Engine

    , Article SAE International Journal of Engines ; Volume 8, Issue 2 , April , 2015 , Pages 399-410 ; 19463936 (ISSN) Salehi, R ; Alasty, A ; Vossoughi, G. R ; Sharif University of Technology
    SAE International  2015
    Abstract
    This paper presents a novel model-based algorithm which is able to detect and isolate major faults assigned to the gas exchange path of a gasoline engine both in the intake and exhaust sides. The diagnostics system is developed for detection and isolation of these faults: air leakage fault between the compressor and the air throttle, exhaust manifold pressure sensor fault, wastegate stuck-closed fault and wastegate stuck-open fault. Sliding mode observers (SMOs) are the core detection algorithms utilized in this work. A first order SMO is designed to estimate the turbocharger rotational dynamics. The wastegate displacement dynamics coupled to the exhaust manifold pressure dynamics is... 

    Detection and isolation of faults in the exhaust path of turbocharged automotive engines

    , Article International Journal of Automotive Technology ; Volume 16, Issue 1 , 2015 , Pages 127-138 ; 12299138 (ISSN) Salehi, R ; Alasty, A ; Shahbakhti, M ; Vossoughi, G ; Sharif University of Technology
    Abstract
    Detection and isolation of faults in the exhaust gas path of a turbocharged spark ignition (SI) engine is an essential part of the engine control unit (ECU) strategies to minimize exhaust emission and ensure safe operation of a turbocharger. This paper proposes a novel model-based strategy to detect and isolate an exhaust manifold leakage and a stuckclosed wastegate fault. The strategy is based on a globally optimal parameter estimation algorithm which detects a virtual hole area in the exhaust manifold. The estimation algorithm requires observation of the exhaust manifold’s input and output flows. The input flow is estimated by a nonlinear Luenberger observer which is analytically shown to... 

    Vibration analysis for fault detection of automobile engine using PCA technique

    , Article 4th International Conference on Control, Instrumentation, and Automation, 27 January 2016 through 28 January 2016 ; 2016 , Pages 372-376 ; 9781467387040 (ISBN) Jafarian, K ; Darjani, M ; Honarkar, Z ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    Abstract
    Today condition monitoring using vibration analysis is not only used for simple proposes like bearings and gears fault detection but also it is used in hybrid motors and cars in automobile industry for detecting or anticipating faults. The main aim of this paper is using vibration analysis in automobile industry to detect and categorize faults appeared due to poppet valve clearance and incomplete combustion sometimes called misfiring phenomenon in internal combustion engine. So we used four accelerometers on OHV engine body for registering vibration signals. Then using PCA technique acquiring data were investigated. At the end we succeeded to classify and detect faults with a high ratio of... 

    Circuit design to improve security of telecommunication devices

    , Article 2017 IEEE 7th Annual Computing and Communication Workshop and Conference, CCWC 2017, 9 January 2017 through 11 January 2017 ; 2017 ; ISBN: 978-150904228-9 Bahrami, H ; Hajsadeghi, K ; Sharif University of Technology
    Abstract
    Security in mobile handsets of telecommunication standards such as GSM, Project 25 and TETRA is very important, especially when governments and military forces use handsets and telecommunication devices. Although telecommunication could be quite secure by using encryption, coding, tunneling and exclusive channel, attackers create new ways to bypass them without the knowledge of the legitimate user. In this paper we introduce a new, simple and economical circuit to warn the user in cases where the message is not encrypted because of manipulation by attackers or accidental damage. This circuit not only consumes very low power but also is created to sustain telecommunication devices in aspect... 

    RI-COTS: trading performance for reliability improvements in commercial of the shelf systems

    , Article 19th International Symposium on Computer Architecture and Digital Systems, CADS 2017, 21 December 2017 through 22 December 2017 ; Volume 2018-January , March , 2018 , Pages 1-6 ; 9781538643792 (ISBN) Ghasemi, G ; Hosseini Monazzah, A. M ; Farbeh, H ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2018
    Abstract
    The flexibility of software-based fault tolerant approaches in providing the required level of reliability Commer-cial-Off-The Shelf (COTS) devices made them the first choice in designing safety-critical systems. In this paper, we propose a reliability improvement method for COTS-based systems, so-called, RI-COTS. The main idea behind RI-COTS is to establish a tradeoff between reliability and performance of COTS system through controlling redundant execution at instruction level. RI-COTS is implemented on LEON2 processor VHDL model. Our simulation results show that comparing with the most related studies, RI-COTS can improve the fault detection capability by 20% with only 4% performance... 

    Transformer practical turn-to-turn fault detection performance using negative sequence and space vector-based methods

    , Article 13th International Conference on Protection and Automation of Power System, IPAPS 2019, 8 January 2019 through 9 January 2019 ; 2019 , Pages 1-6 ; 9781728115054 (ISBN) Farzin, N ; Vakilian, M ; Hajipour, E ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Abstract
    Transformer turn-to-turn fault (TTF) is one of the most difficult failures to detect. The negative sequence percentage differential current (NSPD) and extended park vectors approach (EPVA) are the two most promising methods for detection of the TTF inception. In this paper, in order to evaluate the performance of these methods, various experimental tests are carried out to detect the TTF initiation on the winding of the transformer under different operating conditions such as: No-load operation, when an external fault or an open conductor fault is also occurred. The results show that the setting of the proper thresholds plays the main role in the reliable and secure performance of NSPD and... 

    Practical implementation of a new percentage-based turn-to-turn fault detection algorithm to transformer digital differential relay

    , Article International Journal of Electrical Power and Energy Systems ; Volume 121 , 2020 Farzin, N ; Vakilian, M ; Hajipour, E ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Turn-to-turn fault (TTF) is one of the most prominent reasons for transformer failure. This fault typically initiates by involving only a few turns and can progress to a much more severe fault in a very short time. Therefore, it is critical for the transformer protective relays to detect the TTF in the early stages of its occurrence. The conventional differential relays, in general, cannot detect a minor TTF, and thus, a supplementary protective algorithm is usually required to improve the sensitivity of differential relays against TTFs. This paper proposes a percentage-based fault-related incremental currents method for the precise detection of a low-level TTF. The proposed method employs... 

    Online static/dynamic eccentricity fault diagnosis in inverter-driven electrical machines using resolver signals

    , Article IEEE Transactions on Energy Conversion ; Volume 35, Issue 4 , May , 2020 , Pages 1973-1980 Lasjerdi, H ; Nasiri Gheidari, Z ; Tootoonchian, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Abstract
    Inverter driven electrical machines need resolver for position estimation and efficient electronic commutations. In this paper, the resolver signals are also used for the purpose of mechanical fault diagnosis. Therefore, a comprehensive procedure based on winding function (WF) method is presented to propose a noninvasive index to identify the mechanical fault's type (static/dynamic eccentricity) and even its percentage. In this regard, once the resolver signals are measured and saved in health condition. Then, during the operation of the motor, calculating the proposed index using the healthy and faulty signals leads to predict the fault type and its percentage. The success of the proposed... 

    Experimental study of rolling element bearing failure pattern based on vibration growth process

    , Article Proceedings of the 29th European Safety and Reliability Conference, ESREL 2019, 22 September 2019 through 26 September 2019 ; 2020 , Pages 1179-1186 Hosseini Yazdi, M ; Behzad, M ; Ghodrati, B ; Taghizadeh Vahed, A ; Sharif University of Technology
    Research Publishing Services  2020
    Abstract
    Rolling-element bearing (REB) Failure is one of the most common failure in rotary machines in industry. Therefore, this concern draws attention to the concept of diagnostic and the prediction of REB failure. The efficacy of vibration analysis in this area has led many researchers to focus on this topic in recent decades. Defective bearings such as fatigue, surface roughness, and corrosion can lead to disastrous accidents. Therefore, providing an algorithm for the detection and classification of bearing defects is valuable and useful. The prediction of the bearing's lifetime is important to ensure the planned production in an industrial unit. In this paper, different models for performance... 

    High-impedance fault detection using multi-resolution signal decomposition and adaptive neural fuzzy inference system

    , Article IET Generation, Transmission and Distribution ; Volume 2, Issue 1 , 2008 , Pages 110-118 ; 17518687 (ISSN) Etemadi, A. H ; Sanaye Pasand, M ; Sharif University of Technology
    2008
    Abstract
    High-impedance faults (HIFs) on distribution systems create unique challenges to protection engineers. HIFs do not produce enough fault current to be detected by conventional overcurrent relays or fuses. A method for HIF detection based on the nonlinear behaviour of current waveforms is presented. Using this method, HIFs can be distinguished successfully from other similar waveforms such as nonlinear load currents, secondary current of saturated current transformers and inrush currents. A wavelet multi-resolution signal decomposition method is used for feature extraction. Extracted features are fed to an adaptive neural fuzzy inference system (ANFIS) for identification and classification.... 

    A novel GA-based High-Level Synthesis technique to enhance RT-level concurrent testing

    , Article 14th IEEE International On-Line Testing Symposium, IOLTS 2008, Rhodes, 7 July 2008 through 9 July 2008 ; 2008 , Pages 173-174 ; 9780769532646 (ISBN) Karimi, N ; Aminzadeh, S ; Safari, S ; Navabi, Z ; Sharif University of Technology
    2008
    Abstract
    This paper presents an efficient High-Level Synthesis (HLS) approach to improve RT-Level concurrent testing. The proposed method used for both fault detection and fault location. At first the available resources are used in their dead intervals to test active resources for fault detection, and then some changes are applied to the RT-Level controller to locate the faults. The fault detection step is based on a genetic algorithm (GA) search technique. This genetic algorithm is applied to the design after high level synthesis process to explore the test map. The proposed method has been evaluated based on dependability enhancement and area/latency overhead imposed to different benchmarks after... 

    An on-line BIST technique for stuck-open fault detection in CMOS circuits

    , Article 10th Euromicro Conference on Digital System Design Architectures, Methods and Tools, DSD 2007, Lubeck, 29 August 2007 through 31 August 2007 ; 2007 , Pages 619-625 ; 076952978X (ISBN); 9780769529783 (ISBN) Moghaddam, E ; Hessabi, S ; Drager ; Sharif University of Technology
    2007
    Abstract
    This paper presents a simulation-based study of the stuck-open fault testing in CMOS logic circuits. A novel built-in self-test (BIST) technique is presented for detecting stuck-open faults in these logic families. This scheme does not need test-pattern generation, and thus can be used for robust on-line testing. Simulation results for area, delay, and power overheads are presented. © 2007 IEEE  

    A short-circuit fault diagnosis method for three-phase quasi-Z-source inverters

    , Article IEEE Transactions on Industrial Electronics ; Volume 68, Issue 1 , 2021 , Pages 672-682 ; 02780046 (ISSN) Noroozi, N ; Yaghoubi, M ; Zolghadri, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    Abstract
    In this article, we present a cost-effective solution for switching short-circuit fault diagnosis in a three-phase quasi-Z-source inverter (qZSI). The fault is announced to the processor utilizing a peripheral circuit that covers the fault detection in all switches of the inverter. After the fault detection, a nonmaskable interrupt is activated, cutting the CPU routine, and a fault-diagnosis algorithm is initiated. The exact location of the failed switch is identified through the proposed algorithm. The entire process is accomplished in advance of the critical overcurrent condition, which typically arises after a short-circuit fault. Thanks to this overtake, the proposed technique prevents... 

    Application of SPM for Fault Detection and RUL Estimation; Comparison with Vibration Analysis

    , M.Sc. Thesis Sharif University of Technology Davoodabadi, Ali (Author) ; Behzad, Mehdi (Supervisor)
    Abstract
    Rolling element bearings (REBs) are one of the most critical components in rotating ma-chines. Failure of these components may lead to fatal and costly breakdowns in rotating machinery. Therefore, it is significant to detect faults at early stage accurately. The pur-pose of this study is to compare vibration analysis and shock pulse method (SPM) in early detection of fault and remaining useful life prediction of REBs. To the aim, a set of ac-celerated life tests on REBs was planned. Vibration and shock pulse values accelerated life tests of the REBs were simultaneously measured from the moment of start to the end of the failure by two vibration and shock pulse sensors and their changes were... 

    Fault Tolerant AC/DC/AC Converters for Wind Energy Turbine with Doubly-Fed Induction Generator

    , Ph.D. Dissertation Sharif University of Technology Shahbazi, Mahmoud (Author) ; Zolghadri, Mohammad Reza (Supervisor) ; Saadate, Shahrokh (Supervisor)
    Abstract
    AC/DC/AC converters are widely being used in a variety of power applications. Continuity of service of these systems, as well as their reliability and performance are now of the major concerns. Indeed, the failure of the converter can lead to the total or partial loss of the control of the phase currents and can cause serious system malfunction or even shutdown. Thus, uncompensated faults can quickly endanger the system. Therefore, to prevent the spread of the fault to the other system components and to ensure continuity of service, fault tolerant converter topologies associated with quick and effective fault detection and compensation methods must be implemented. In this thesis, the... 

    Open-Circuit Fault Detection and Localization in Five-Level Active Neutral Point Clamped Converter

    , M.Sc. Thesis Sharif University of Technology Montazeri Hedesh, Hamid (Author) ; Zolghadri, Mohammad Reza (Supervisor)
    Abstract
    Five-Level Active-Neutral-Point -Clamped (5L-ANPC) converter is used for medium-voltage and high-power applications. In many of these applications, availability and robustness against fault are the most important issues. On the other hand, this converter is made of a large number of power semiconductor switches, diodes and capacitors which could increase the failure probability. Thus, fault detection of power circuit elements is necessary for fault tolerant operation of the converter. In this thesis, following an introduction to the topology and operation principles of Five-Level Active Neutral point clamped converter, a novel open-circuit fault detection and localization method is...