Advanced Materials Research Vol. 787

Abstract: The model of a gasoline engines cylinder head with 4 cylinders was reconstructed by CAD through slicing method and using Imageware and UG. The reverse design methods used for complex interior structure surface were explored based on slicing method through remodeling the cylinder head. The technologies of reverse design such as the measure method of points cloud, points cloud data treatment, and curve modeling were studied. The methods can be referenced for reverse designing the similar parts.

Abstract: This study is intended to evaluate the feasibility of introducing a single loop-based vehicle detector in preparation for installing the device for permanent traffic volume counts by segment. Existing AVC comprises two loop sensors and one piezo sensor which are costly for installation. Should the vehicle classifications be similar within the section, reliable traffic data collection would be possible using a single-loop alone, which needs to be evaluated. For this, traffic volume and vehicle classifications collected by two AVCs within a section were analyzed with cost-benefit analysis for analyzing the feasibility of applying a single loop-based vehicle detector . As a result of comparing and analyzing the vehicle type ratio in 36 sections where two AVCs are installed respectively, 90% of the total showed the error rate 15% or less, and according to T-test and correlation analysis result, no statistical significance between two locations in vehicle type ratio was found. According to economical feasibility analysis, B/C 12.19, NPV 474.0 bil and IRR 196%. Thus, collection of vehicle type ratio from one AVC in the section and installation of a singl loop-based vehicle detector in a single section would produce more efficient and cost effective count. Further study on cost and benefit through more intensive statistical analysis would be necessary in the coming days.

Abstract: Automatic Vehicle Classification (AVC) detector, among traffic data collection devices, is very useful but operation failure or damage is often occurred due to unstable power supply, weather changes and poor road pavement condition, causing deteriorated data quality. In case of AVC detector currently used for detecting the vehicle type, 2 or more detectors are installed at the sections with similar traffic pattern, causing unnecessary cost. This study thus is intended to identify the problems with existing vehicle detector so as to develop the improved detector as well as evaluate the performance. This study is intended to identify the problems with existing vehicle detector and develop and evaluate the improved detector. The failure with AVC detector was mostly attributable to unstable power supply and environmental change and complex sensor and controller results in the high cost. Thus, to stabilize the power supply and reduce the failure by environmental change, improvement of the control part and enclosure was made and the cost was reduced by simplifying the sensor and control system and as a result of test, data accuracy, power stability and cost reduction could be achieve, proving high potential applicability to the site in the future.

Abstract: Engineered Material Arresting System (EMAS) is the specified equipment used to prevent aircraft from overrunning. Based on static compression and impact tests of the foam concrete, material model and parameters in the FEM simulation are determined. Then numerical simulations are performed on FAA(Federal Aviation Administration) aircraft arresting tests. The simplified aircraft arresting FEM model and corresponding simulation method are verified. The thickness effect of the arresting bed is studied.

Abstract: In order to improve grinding efficiency and achieve low-power operation, this paper presents the design of main drive gear. Under the premise of ensuring the gear strength, using a large teeth and a small modulus extend the life of the big gear, reduce costs to the optimal economic benefit. Gear layouts with optimization method and the design of the drive part meet the requirements of energy saving, high efficiency, low noise, safety and reliability, with certain application values.

Abstract: This paper presents the rudder inflow including fully non-uniform wake on a deep drafted LNG vessel in shallow water. The Ansys Fluent v.6.2 software was used to solve Reynold Average Navier-Stokes (RANS) equations, and Icem CFD as a mesh generator. The modeling was conducted based on the B 5-88 type propeller, with a diameter (D) of 7.7 meters. The propeller was meshed using tetra unstructured mesh in a flow field based on 3-Dimension incompressible Navier-stokes solver. It was found in the propeller-to-rudder interaction that there was a slight drop of pressure at rudder leading edge of 0⁰ rudder angle of attack (AoA). However, the dropped pressure was observed on its leading edge as the rudder angle of attack was increased to-7⁰. The effect of increasing rudder deflection was generated by the flow around it and inflows moved over the rudder. This deflection effect continued to X/D=0.4; afterwards, a zero velocity appeared because of the flow encountered by the stagnation region.

Abstract: This article presents current-mode universal biquad filters based on CDTAs. The filter circuits using four CDTAs and two grounded capacitors which are able to provide low-pass, high-pass, band-pass, band-reject and all-pass functions. The pole frequency can be orthogonally controlled from quality factor and the circuits have high output impedance appropriate for cascade connection application in current mode which is capable to directly drive load. This qualification is very appropriate for further development into an integrated circuit. The results of PSPICE simulation program are corresponding to the theoretical analysis.

Abstract: Fourier transform phase angle carries shape information of image, statistics phase angles of all pixels will reflect the image shape characteristics. According to this theory, for study the relationship between image texture and papermaking method, a novel method for description linear image texture was proposed, and experiments were carried out. The experiments showed that the new method achieved texture feature extraction, suitable for handmade paper microscopic image analysis.

Abstract: A correlation between the spray tip penetration and dispersion area was investigated. Images of diesel fuel sprays from high-pressure common rail injectorwere analyzed using an edge-detecting technique. Diesel fuel sprays were injected into a pressurized spray chamber. The gas density in the spray chamber was 17.97kg/m³, which is representative of the density in a typical diesel engine when the fuel injection process starts. Consecutive images of the diesel spray were captured with a high-speed digital camera. The spray tip penetration and dispersion area according to the time when the fuel injectionprocess starts was determined. The spray dispersion area increased linearlywith the time after the fuel injection process starts.The slope of the linear correlation line between the spray dispersion area and time after start of fuel injection was steeper when the fuel injection pressure was higher. There was little effect on the slope of the linear correlation line with a change of the duration of the fuel injection time. Also, the spray dispersion area increased parabollically with the spraytip penetration.

Abstract: NiO/YSZ (6:4 wt.%) and NiO/SDC (6:4 wt.%) anodes, NiO/YSZ (SDC) anode-supported SDC electrolyte half cell were fabricated by tape casting, laminating and co-sintering technique. The laminating temperature was chosen to be 85¡æ that was above the glass transition temperature of PVA binder. Laminating pressure of 30-70 MPa was tried and it was found that 50 MPa was the best. Some unreacted CeO₂ was decomposed between 1365-1393¡æ and Sm₂NiO₄ compound was formed in NiO-based complexes at about 1445-1448¡æ. The sintering temperature of 1400 ¡æ was selected. The flexural strength of NiO/SDC anode (with an open porosity of 22.7%) and NiO/YSZ anode (with an open porosity of 21.2%) was 68.8 and 165.6 MPa, respectively. The flexural strength of as-fabricated NiO/YSZ anode achieved the requirement of the mechanical property for anode-supported SOFCs. SDC electrolyte with dense, crackfree and uniform structure was successfully adhered to the porous and homogeneous NiO/YSZ anode.