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Apr 20, 2018Open    AccessArticle

Research and Application of Supercapacitor Charging System

Minghai Duan, Xiaoxiao Cao, Qiyu Zhang, Xiaohui Chen
Based on the special power supply requirements of the project, the AD8210YRZ (current monitoring operational amplifier) monitors the charging current in real time, and its output is fed back to the detection pin of the TPS5430DDA to adjust the charging voltage of the capacitor. Combined with the charge-discharge characteristics of the super capacitor, the circuit realizes high current constant current charging at low voltage and c
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Apr 12, 2018Open    AccessArticle

Finite Element Analysis of High Frequency Breaker Vibrator

Xiaofan Hou, Guoping Yang
High-frequency breaker vibrator mainly includes three major components of the structure: the vibration box, knife row and bucket teeth. Due to the periodic impact load of the high-frequency breaker, there is a risk of failure if the structure of the exciter is not designed properly, which will seriously affect the working efficiency and service life of the breaker. The static characteristic of the exciter is an important part of e
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Mar 30, 2018Open    AccessArticle

Hydraulic Ripper Computer Modeling and Simulation

Yanping Huang, Guoping Yang
It’s very useful to put the virtual prototype technology into hydraulic ripper, just for improving the product research and development efforts. A certain type of hydraulic ripper was simulated and calculated using CATIA and ADAMS software, the simulation system is set up, and the relevant parameters of hydraulic ripper are gotten; on this basis, a prototype model is compared with the reality. At the same time, a comparative anal
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Mar 22, 2018Open    AccessArticle

Development of a Simulation Software for Plant Asset Depreciation Computation Using Modified Accelerated Cost Recovery System

Basil Olufemi Akinnuli, Oluwole Timothy Ojo
This work presents the computation of depreciation under Modified Accelerated Cost Recovery System using simulation software developed for the purpose. The three case studies presented provide in-depth analysis and applications of the simulation software that was developed. The results from the three case studies proved that the investment of $900,000 by Virgin Atlantic airline to purchase three new aircrafts will be
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Feb 23, 2018Open    AccessArticle

Effect of Geometrical Parameters on the Coefficient of Performance of the Ranque-Hilsch Vortex Tube

Seif T. Abdelghany, Hamdy A. Kandil
The Ranque-Hilsch vortex tube is a simple device with no moving parts and no mechanical operations. This tube separates the inlet air into two distinctive regions; an outward high temperature region and an inner low-temperature one. A computational study of the vortex tube is presented in this article using the ANSYS Fluent software whose results showed good agreement with the ex-perimental measurements.
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Jan 24, 2018Open    AccessArticle

Study on Braking Energy Recovery of Four Wheel Drive Electric Vehicle Based on Driving Intention Recognition

Feihu Xuan, Huanhuan Zhang, Wenwen Xiao
To judge the driver’s driving intention can effectively improve the car braking energy recovery. Aiming at the problem of braking energy recovery of four wheel drives electric vehicle, combined with the main restrictive conditions of ECE regulations, motor characteristics and battery SOC, a braking force distribution strategy for different braking intention is established. The MATLAB/ Simulink platform is used for modeling and sim
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Jan 15, 2018Open    AccessArticle

Investigation of Addition Titanium Dioxide on General Properties of Polycarbonate

Najim A. Saad, Esraa Rzaq Jwad
Polycarbonate is a transparent commercial engineering polymer used in many applications especially in mobile protector screen for its good properties. In the present paper, nano composite material composed of polycarbonate sheet and nano titanium dioxide particles was prepared. Three ratios of TiO2 (0.01-0.03-0.05 g) were employed with polycarbonate by using pressing technique. Diff
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Dec 28, 2017Open    AccessArticle

Combustion and Emission Analysis of SI Engine Fuelled by Saudi Arabian Gasoline RON91 and RON95 with Variable Compression Ratios and Spark Timing

Saud A. Binjuwair, Abdullah M. Alkhedhair, Ahmed A. Alharbi, Ibrahem A. Alshunifi
The performance, emissions and combustion characteristics of a spark ignition engine at varying compression ratio and spark timing using two grades of gasoline in Saudi Arabian market, RON91 and RON95 have been presented on this paper. The tests were conducted using a single cylinder, four-stroke spark ignition research engine that operates with different RON fuel. The experiments were conducted at a wide-open throttle with an eng
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Nov 30, 2017Open    AccessArticle

Experimental Investigation of Photostrictive Materials for MEMS Application

Mosfequr Rahman, Mahbub Ahmed, Masud Nawaz, Gustavo Molina, Abdur Rahman
Micro-Electro-Mechanical-Systems (MEMS) is an emerging technology that integrates micromachined mechanical structures with integrated circuits (IC). During the last two decades, it has grown vastly as a prominent research area among scientists and engineers. Usually the main components of MEMS are sensors, actuators, and structures with all in microscale. A photostrictive mate-rial has high potential to be used in a MEMS applicati
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Jun 26, 2017Open    AccessArticle

Study of Load Fluctuation Characteristics of PDC Bit during Gas Extraction Borehole in Soft Coal Seam

Shifeng Wang, Xiaoming Han, Qiangqiang Zhang
Load fluctuation characteristics have a great influence on drilling performance. So, study the influence of drilling kinematic parameters on the load fluctuation characteristics of PDC bit becomes more and more important. Gas drainage drilling experiment table was built and Gas drainage drilling experiment was carried out under different feed speed, different rotation speed and same drilling thickness with different feed speed and
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