Engineering

Aerodynamic performance analysis of a non planar C-wing using CFD
The aircraft is the second fastest method of transport. One of the most important necessities of an aircraft is the air flow over the wings to produce lift. Wing is a structure attached to the fuselage of the aircraft. Lift is an aerodynamic force which is counteracted by drag. In air transport, the cost of operation per each person/unit is higher than the other transport because of lower passe...


Analytically driven experimental characterisation of damping in viscoelastic materials
The damping assessment of highly dissipative materials is a challenging task that has been addressed by several researchers; in particular Oberst defined a standard method to address the issue. Experimental tests are often hindered by the poor mechanical properties of most viscoelastic materials; these characteristics make experimental activities using pure viscoelastic specimens prone to nonli...
Analytic approach to determine optimal conditions for maximizing altitude of sounding rocket
An analytic approach to determine the optimal conditions for maximizing altitude of a sounding rocket at burn-out state or stationary state is suggested. The one-dimensional rocket momentum equation including thrust, gravitational force, and aerodynamic drag is solved. The typical case that has an analytic solution of the rocket equation is considered. Also, numerical calculations are conducted...


Aerodynamic characteristics of high performance rounds at Mach 1.8 to 4
This paper presents a wind tunnel investigation of the aerodynamic performance of two high performance supersonic rounds: the standard 155 mm M549 projectile and a new optimum round that was redesigned from the standard round. The experiments were performed over a wide range of Mach numbers ( M = 1.8 , 2, 2.5, 3, 3.5, and 4) providing new data for the consideration that these rounds can be flow...
Failure behaviour of SPR joints after salt spray test
The ageing of steel/aluminium hybrid joints in salt spray environment, obtained by Self-Piercing Riveting technique (in the next SPR), was studied to evaluate their mechanical degradation in these critical environmental conditions. The investigation was carried out on symmetrical or unsymmetrical joints at varying the total thicknesses (i.e. 2, 2.5 and 3mm). The joint strength was determined by...


Experimental and numerical analysis to collapse of a framed structure subjected to seismic loading
The nonlinear numerical analysis to collapse of civil structures presents several difficulties, even for mechanically well-characterized materials, such as steel. In the case of steel, where the nonlinear constitutive equation is one of the simplest and best known, in many cases there are large differences when the numerical analysis and experimental results are compared. In this paper, the res...
Estimation of demands resulting from inelastic axial impact of steel debris
Impact of debris generated during extreme events such as floods, tsunamis, and hurricane storm surge and waves can cause severe structural damage. It is necessary to be able to estimate debris impact forces properly in order to design the structures to resist typical water-borne debris. The objective of this study is to characterize the impact demands generated during inelastic response of the ...

Decentralized self-selection of swarm trajectories: from dynamical systems theory to robotic implementation
In this paper, we present a distributed control strategy, enabling agents to converge onto and travel along a consensually selected curve among a class of closed planar curves. Individual agents identify the number of neighbors within a finite circular sensing range and obtain information from their neighbors through local communication. The information is then processed to update the control p...
A two-stage bivariate logistic-Tobit model for the safety analysis of signalized intersections
Crash frequency and crash severity models have explored the factors that influence intersection safety. However, most of these models address the frequency and severity independently, and miss the correlations between crash frequency models at different crash severity levels. We develop a two-stage bivariate logistic-Tobit model of the crash severity and crash risk at different severity levels....

A robust coronary artery identification and centerline extraction method in angiographies
Coronary artery disease (CAD) is a leading cause of death worldwide. Although coronary CT angiography (CTA) and other new technologies emerge increasingly, conventional coronary angiography (CCA) remains as the gold standard for diagnosis of CAD, and the only way to be involved in the interventional surgery. Centerline extraction of the coronary arteries is the essential information for radiolo...
Characterization of sumac ( Rhus tripartitum ) root barks tannin for a potential use in wood adhesives formulation
The phenolic composition of sumac root barks was studied. Colorimetric assays, FT-IR and NMR were used to examine the phenolic composition and tannins nature. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry was used to examine the structure of the tannin oligomers. TGA analysis was used to study the thermal stability of sumac tannin extract. Analyzes sho...

Fabrication, material properties, and application of bamboo scrimber
In this study, mechanical fluffing, thermal treatment, and phenol formaldehyde (PF) impregnation, as well as cold-in and cold-out hot-pressing processes, were used to fabricate bamboo scrimbers. The water absorption, dimensional stability, and mechanical properties of the bamboo scrimbers were determined. The bamboo scrimber made from bamboo bundles processed at 180 °C hot dry air treatment c...
On computation of stabilizing loop gain and delay ranges for bi-proper delay systems
A graphical method for exactly computing the stabilizing loop gain and delay ranges was proposed [Le BN, Wang Q-G, Lee T-H. Development of D-decomposition method for computing stabilizing gain ranges for general delay systems. J Process Control 2012] for a strictly proper process by determining the boundary functions which may change system׳s stability. a bi-proper process is rare but causes g...
Optimizing bi-objective redundancy allocation problem with a mixed redundancy strategy
Redundancy Allocation (RAP) is a challenging subject which has attracted the attention of many authors. Generally, in the RAP there are two strategies for using the redundant components: active and standby. In this paper a new redundancy strategy, called mixed redundancy, is introduced and considered in a multi-objective optimization RAP. demonstrate that the new strategy increases the reliabil...
Internal loops in superelastic shape memory alloy wires under torsion – Experiments and simulations/predictions
Understanding torsional responses of shape memory alloy (SMA) specimens under partial or fully transformed cases with internal loops is of particular importance as the entire response might not be always utilized and only a portion of the entire response (internal loop) might be of significance to designers. In this work, we present experimental results of large complex loading and unloading to...