OALib Journal
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Nov 09, 2020Open    AccessArticle

Experimental Study on Electrically Assisted Pressure Solid-State Welding of Titanium Alloy Plate

Yongfang Li, Yali Yang
In this paper, the electrically assisted pressure solid-phase welding of titanium alloy plate is studied. Two different sizes of dies are used to apply pressure to the specimens. At the same time, electric current is applied to the specimens which are in plastic compression deformation. After welding, the joint strength is evaluated by tensile tests. The results show that for the small dies, the optimal thickness reduction corresponding to the maximum fracture load for a given current intensity ...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106892


Oct 09, 2020Open    AccessArticle

Research on the Control System of Horizontal Well Tractor Driving Motor

Jie Wang, Yongjun Chen, Zhou He, Kuan Shi, Yinsheng Li
In recent years, the global demand for oil has been increasing. In order to reduce production costs, horizontal drilling technology is basically used for deep oil storage, so a cable-driven downhole towing system (horizontal well tractor) has emerged. The traditional horizontal well tractor drive motor has large volume, low efficiency, high vibration and noise, and cannot meet the requirements. Therefore, a permanent magnet synchronous motor with small size, light weight and high efficiency is p...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106806


Sep 30, 2020Open    AccessArticle

Sparse Recovery Diagnosis Method Applied to Hybrid Dynamical System: The Case of Three-Phase DC-AC Inverter for Wind Turbine

Wafa Torki, Jean-Pierre Barbot, Malek Ghanes, Lassaad Sbita
Power electronic systems tend to be great contributors to faults in many applications especially wind turbines because they are exposed to harsh operation conditions in height. Thus, a great attention has been paid to fault diagnosis technologies. In this paper, the concept of an exact recovery under a sparse fault assumption is applied to the diagnosis of three-phase DC-AC power electronic inverter, this method is denoted as Sparse Recovery Diagnosis (SRD). This method has the advantage to reco...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106776


Sep 10, 2020Open    AccessArticle

Investigation of Shell and Tube Heat Exchanger with Disc-and-Doughnut Baffles

Kuerbanjiang Wusiman, Zhaolun Zhou
Disk and doughnut baffles configuration for shell tube heat exchangers (STHXs) is one of the solutions for compensating the higher pressure drop penalty induced by conventional segmental baffles. Furthermore, absently reliable references for the optimum design of this type of STHXs are our main purpose to carry out this investigation. From modeling numerical simulation results, with 7 baffles and 70% baffles ratio geometrical dimension is suggested the optimum configuration of this type of heat ...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106762


Aug 26, 2020Open    AccessArticle

Electronic Circuit Failure Detection Using Thermal Image

Azrul Mahfurdz, Rohaizan Saher, Wan Ghani Wan Pi
This inspection of electronic circuits can be performed either by connection with voltage supply and without voltage supply. However, inspections during the working circuit may invite serious harm and damage to the components in the circuit. Usually, the method used is to measure the current and voltage values in the circuit based on the reading reference when the circuit is in normal condition. There is another method that can help check the current circuit condition by using image processing m...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106662


Aug 21, 2020Open    AccessArticle

Triangular Omnidirectional Wheel Motion Control System

Shimin Hu, Hongyu Chen, Yang Shao
Omni-directional wheels are more flexible than traditional wheeled robots. Through three rounds of omni-directional wheel mobile platform modeling and kinematics analysis. The speed of the three wheels can be analyzed when the omni-moving platform moves in a certain direction. Then the CPU by the PID algorithm to calculate the connection of omni-directional wheel three dc motor need duty ratio, round so as to realize omnidirectional mobile platform of fast moving to any Angle. The experimental r...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106677


May 15, 2020Open    AccessArticle

Déja vu and Wind Turbines: A Review of Lived Experiences after Appeals of Ontario Industrial-Scale Wind Power Facilities

Jane Wilson, Carmen Krogh, Paula C. Peel
This paper is a review of reports of lived experiences of residents in rural/small-town Ontario, Canada and a comparison to the concerns raised during citizen-sponsored appeals of industrial-scale wind power project approvals. We found that the concerns leading to the decisions to appeal power projects have been borne out in real-life experience, as government documents record thousands of complaints about adverse effects on the environment and human health. These findings support the need for e...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106276


Apr 24, 2020Open    AccessArticle

Multi-Memory Grouping Wrapper with Top Level BIST Algorithm

Narek Mamikonyan, Suren Abazyan, Vakhtang Janpoladov
This algorithm integrates second level Built in self-test (BIST) into multiple memory grouping wrapper. Second level BIST brings additional reliability into memory system while fastening testing time. Main approach is to test whole memory modules from top level by numerous step count of which can be modified based on power consumption requirement and overheat conditions. The worst case of the algorithm can be observed by the time when number of steps is equal to the number of memory modules, oth...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106294


Apr 09, 2020Open    AccessArticle

Electrochemical Advanced Oxidation Processes (EAOPs) for Disinfecting Water—Fresh Perspectives

Djamel Ghernaout, Noureddine Elboughdiri, Saad Ghareba, Alsamani Salih
During recent decades, study endeavors have been performed at elaborating more efficient techniques for handling waters carrying pathogens. Among such methods, the famous electrochemical advanced oxidation processes (EAOPs) have induced augmenting attention. Such methods are founded on electro-chemically producing powerful oxidants like hydroxyl radicals (●OH). This work portrays a global view on killing different microorganisms by some usual EAOPs. Electrochemically-driven techniques are earnin...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106257


Apr 08, 2020Open    AccessArticle

Standard Cell Placement Optimization Using Quadratic Placement Algorithm

Suren Abazyan, Narek Mamikonyan, Vakhtang Janpoladov
Designs including tens of millions of standard cells in one chip are commonly used in current IC projects, so finding optimal location on a chip surface for each logic cell is a very important step in IC design. Apart from finding room for logic cell placement with minimum chip area, length of connecting wires is also playing big role and needs to be taken under control. In this paper, research and implementation of standard cell placement-optimizations’ quadratic algorithm is described. Main re...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106218


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