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Full-Text Articles in Engineering
Open Source Low-Cost Power Monitoring System, Shane W. Oberloier, Joshua M. Pearce
Open Source Low-Cost Power Monitoring System, Shane W. Oberloier, Joshua M. Pearce
Joshua M. Pearce
This study presents an entirely open-source, low-cost power monitoring system capable of many types of measurements including both loads and supplies such as solar photovoltaic systems. In addition, the system can be fabricated using only open source software and hardware. The design revolves around the Digital Universal Energy Logger (DUEL) Node, which is responsible for reading and properly scaling the voltage and current of a particular load, and then serializing it via an on-board ATTiny85 chip. The configuration of the DUEL node allows for custom sensitivity ranges, and can handle up to 50 A and 300 V. Up to 127 …
Compressive Sensing For Feedback Reduction In Mimo Broadcast Channels, Mohammed Eltayeb, Tareq Al-Naffour, Hamid Bahrami
Compressive Sensing For Feedback Reduction In Mimo Broadcast Channels, Mohammed Eltayeb, Tareq Al-Naffour, Hamid Bahrami
Hamid Bahrami
In multi-antenna broadcast networks, the base sta-tions (BSs) rely on the channel state information (CSI) of the users to perform user scheduling and downlink transmission. However, in networks with large number of users, obtaining CSI from all users is arduous, if not impossible, in practice. This paper proposes channel feedback reduction techniques based on the theory of compressive sensing (CS), which permits the BS to obtain CSI with acceptable recovery guarantees under substantially reduced feedback overhead. Additionally, assuming noisy CS measurements at the BS, inexpensive ways for improving post-CS detection are explored. The proposed techniques are shown to reduce the …
Condition Based Maintenance Optimization Of Wind Turbine System Using Degradation Prediction, Elham Pazouki, Hamid Bahrami, Seungdeog Choi
Condition Based Maintenance Optimization Of Wind Turbine System Using Degradation Prediction, Elham Pazouki, Hamid Bahrami, Seungdeog Choi
Hamid Bahrami
This paper proposes an optimal Condition Based Maintenance (CBM) policy for a multi-component system. Especially, multicomponent wind turbine has been analyzed to investigate cost relationship between maintenance and energy production schedule. Wind turbine consists of numerous mechanical and electrical components, and each of which shows independent stochastic deterioration process. The fundamental of proposed strategy is derived based on the statistically modeled aging and deterioration of each critical component in the wind turbine system to optimally schedule CBM task. Scheduling the CBM task is variably and iteratively performed through optimizing joint failure probability threshold and inspection/maintenance interval to minimize the total …