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RISS 인기검색어
- 검색키워드
- 저자 : Mahyar Naraghi (검색결과 4 건)
- 무료
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INTEGRATED CONTROL OF THREE-AXLE VEHICLES TO IMPROVE THE LATERAL DYNAMICS ON SLIPPERY ROAD
Amirreza Parvareh,Mahyar Naraghi 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
To improve the handling and directional stability of three-axle heavy vehicles, this paper suggests a control strategy thatcombines direct yaw moment control (DYC) and active front steering (AFS). The control system's structure is divided intothree main layers. Based on an online adjustable index, a fuzzy controller acting as a supervised system decides the cooperationof DYC and AFS in the upper layer. In the intermediate layer, the DYC system controller uses a sliding mode controllerto calculate the corrective body moment. The AFS system uses a fuzzy controller to generate the corrective steering anglenecessary to achieve the three-axle vehicle motion objective. The algorithm for distributing braking force and the slip ratiocontrol (SRC) system comprises the lower layer. The anti-lock braking system (ABS) in the SRC system is built to producethe necessary braking forces at low slip ratios while preventing the wheels from locking up at high slip ratios. Considerationhas been given to a heavy, three-axle, 9-DOF nonlinear vehicle with uncertain dynamics. Trucksim software and simulationtests have validated the model. The proposed control system's satisfactory performance is shown through various maneuvers.
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Crack detection in rectangular plate by electromechanical impedance method: modeling and experiment
Mehdi Rajabi,Mahnaz Shamshirsaz,Mahyar Naraghi 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.4
Electromechanical impedance method as an efficient tool in Structural Health Monitoring (SHM) utilizes the electromechanical impedance of piezoelectric materials which is directly related to the mechanical impedance of the host structure and will be affected by damages. In this paper, electromechanical impedance of piezoelectric patches attached to simply support rectangular plate is determined theoretically and experimentally in order to detect damage. A pairs of piezoelectric wafer active sensor (PWAS) patches are used on top and bottom of an aluminum plate to generate pure bending. The analytical model and experiments are carried out both for undamaged and damaged plates. To validate theoretical models, the electromechanical impedances of PWAS for undamaged and damaged plate using theoretical models are compared with those obtained experimentally. Both theoretical and experimental results demonstrate that by crack generation and intensifying this crack, natural frequency of structure decreases. Finally, in order to evaluate damage severity, damage metrics such as Root Mean Square Deviation (RMSD), Mean Absolute Percentage Deviation (MAPD), and Correlation Coefficient Deviation (CCD) are used based on experimental results. The results show that generation of crack and crack depth increasing can be detectable by CCD.
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Mojtaba Hashemi,Ali Kamali Egoli,Mahyar Naraghi 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.4
In this paper, the integrated design problem of Fault Estimation (FE) and Fault Tolerant Control (FTC)for saturated systems is considered. The system suffers from input saturation and L2-bounded disturbances. To designan adaptive observer-based FE, the actuator output measurements are not used, when the actuator is saturated,there exist new interactions between FE and FTC. In such a case the separation principle for FE and FTC designdoes not hold anymore. In this paper, a method is introduced for integrated design of FE and FTC, which guaranteesboundedness stability of such a system. To extract sufficient conditions for stability and minimum L2-gainperformance for disturbance rejection, the Modified Sector Condition (MSC) is employed for saturation modeling. Also, Quadratic Polytopic Differential Inclusion (QPDI) approach is developed for the comparative study. All conditionsare cast as Linear Matrix Inequality(LMIs) that can be evaluated in a single step. In a numerical example,the feasibility of the introduced method for stability guarantee is demonstrated and performance characteristics ofFE and FTC in disturbance rejection are compared for both modeling approaches.
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