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Adaptive Kriging multi-objective reliability-based design optimization of fuzzy logic controller for mr damper structures
Get PDFSensitivity analysis of hydrodynamic journal bearing failure modesdue to lubricant contamination
Get PDFEffects of uncertainties in the particle distribution of rubber-soil mixture on the performance of shallow foundations
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EFFECTS OF EXTREME FLOODING EVENT ON TRAFFIC LEVEL OF SERVICES IN TUGUEGARAO CITY
No full textLand transportation networks such as roads and other transportation facilities underpin socioeconomic development of communities by enabling fast and efficient movement of goods and people from one point to another. However, like any other infrastructures road networks are also vulnerable to natural calamities such as earthquakes and floods that disrupts the natural flow of traffic. In the occurrence of flooding incidents, several road networks are submerged in water making it impassable for traffic especially those located in low-lying areas. In this cases, traffic that were originally catered by these flooded roads will be re-routed to other alternate routes which will then affect the traffic performance of those alternate routes. This study assessed the effect of flooding events on the traffic stream performance measured through its Level of Service (LOS). Greenshields’s linear modelling was used to estimate the maximum capacity of roads based on observed data and the corresponding volume-to-capacity ratio during normal weather condition and using travel survey to estimate the additional re-routed volume to assess the volume-to-capacity ratio during flooding events. The v/c ratio for Enrile Avenue changes from 0.483 (LOS B) to 0.515 (LOS C), while the v/c ratio for Maharlika Highway changes from 0.541 (LOS C) to 1.257 (LOS F), and Lastly, Luna extension’s v/c ratio increases from 0.523 to 0.590, though the LOS remains the same. The researcher concluded that the Level of Service (LOS) in the three selected road sections were greatly affected as their v/c ratio increases. Moreover, formulating and enforcing policies on roadway clearing operations especially on the outer lanes of all major roads could help improve the traffic performance of this roads even during flooding events
Accelerating Multiscale Simulations using Uncertainty-Driven Phase-Field Mixtures of Constitutive Models
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Investigation of Electrolytes for Enhancing Hardness of MAO Coatings on 6061 Aluminum Alloy and the Correlation between Hardness and Corrosion Resistance: Statistical review
No full textAluminum 6061 alloy is the most frequently used aluminum alloy in automobile, aircraft, and aerospace industries. However, poor wear and corrosion resistances, considerably affecting their scaled-up applications. Microarc oxidation (MAO) is ecofriendly, straightforward, efficient, and rapid technique for improving the surface characteristics of aluminum alloys and proves to be a highly effective surface treatment technique to enhance the corrosion and wear resistances of aluminum alloys. This article describes progresses realized in recent years for understanding the effects of electrolyte type, electrolyte composition, and additives on the morphology and properties of MAO coating film, and on the hardness of MAO coatings .Usually, applying an electrolyte system and introducing some additives in appropriate concentrations can improve the quality of the MAO coatings and their hardness, whereas some additives have negative effects on the hardness which is related to the corrosive behavior of aluminum. This review article showed that the microhardness values of the MAO coatings which was prepared in Na2AlO2 electrolyte was greater than the one which was prepared in Na2SiO3 electrolyte with percentage 62 %. As well as found that coatings generated by using pulsed-bipolar mode power source in MAO gives superior characteristics and investigated that provide additives to electrolyte not always enhance hardness and corrosion resistance. The review also highlights that higher hardness often correlates with improved corrosion resistance
Robotic additive manufacturing of continuous carbon fiber thermoplastic composites
No full textFused Filament Fabrication (FFF) technology is one of the most popular 3D printing processes and interest in direct manufacturing of functional parts is growing. For this reason, both techniques and feedstock materials require improvements to meet the mechanical requirements of load-bearing components. In this sense, this work is focused on the robotized FFF process of continuous carbon fiber thermoplastic composites. It includes an analysis and comparison of the developed FFF robotic 3D printing process with the conventional process, as well as the development of robotic 3D printing equipment for the manufacture of continuous fiber reinforced composites and the characterization of the printing process developed to print the new filaments based on the thermoplastic matrix and reinforced with continuous carbon fiber. The material was analysed by microscopic analysis, and the manufacturing specimens were characterized by mechanical tensile and flexural tests