9 Articles Published

1. ANALYSIS OF THE EFFECT OF CYCLIC LOADING ON COTTON-SPANDEX KNITTED FABRIC

Authors: ABEER MOHAMED , MAGDI EL MESSIRY

Abstract: knitted fabrics find numerous applications in sportswear fabric industry, during their use it can be subjected to loading-unloading due to the body movements which can be indirectly affected by the dynamic elastic recovery value of the fabrics. The cyclic loads lead to the redistribution of fibers in the yarn structure, because they tend to get the minimum level of energy. Dimensional properties of knitted fabric are widely affected by the externally applied forces that could involve permanent deformation. Cotton/Spandex knitted fabrics are widely used for several applications. In this work, an attempt was done to analyze the effect of cyclic loading on cotton/spandex knitted fabric subjected to the different levels of cyclic loading under different values of initial extensions. Knitted fabric mechanical properties with different percentages of spandex were tested. The fabric properties and the number of cycles indicate the change of the residual extension and the drop in the fabric st

Keywords: spandex knitted fabric, cyclic loading, elastic recovery, and sportswear fabrics

Pages: 1 - 6 | DOI: 10.15224/978-1-63248-090-3-41

2. RESEARCH ON THE EFFECT OF HEATING ON THE FORMABILITY OF TITANIUM BY INCREMENTAL SHEET FORMING TECHNOLOGY

Authors: LE KHANH DIEN , NGUYEN NGOC PHUONG , NGUYEN TAN HUNG , NGUYEN THANH NAM

Abstract: In the recent years, the application of Incremental Sheet Forming (ISF) in manufacturing small batch sheet products has increased rapidly, especially in medical treatment domain such as forming artificial titanium piece of human cranium because of the typical and unique cranium of each individual. This paper focus on the effect of heating on the formability of Titanium sheet material by ISF technology. Heating is one of the measures of increasing the formability of Titanium, the typical material that is permitted to manufacture the replaceable cranium. The design of experiment, the analyses of variance and the process are applied to the result of empirical process of circular lateral profile models in order to perform a regression equation that shows the relation of heat and other factors to the formability of Titanium sheet. The comparison

Keywords: ISF, heating, formability metal sheet, design of experiment, analyses of variance, regression equation, mechnical engineering.

Pages: 7 - 11 | DOI: 10.15224/978-1-63248-090-3-42

3. A COMPUTATION OF CONSUMPTION POWER OF SINGLE POINT INCREMENTAL FORMING TECHNOLOGY

Authors: LE KHANH DIEN , NGUYEN TAN HUNG , NGUYEN THANH NAM

Abstract: From the recent decade, Single Point Incremental Forming (SPIF) [1] has been a new forming sheet technology in industry. However, there are a few of studies in theoretical researches and the formulas of stresses of formed sheet in [2] could not convince the mechanic of breaking of the workpiece sheet. In this paper, we proposed a new computation in pure analytics of normal stresses that are based on the strains and stresses of Ludwig‟s formula. The formulas of stresses are in accordance with the mechanics of breaking sheet and are mentioned in [4]. The paper displays also the computation of forming forces, torques and consumption power. The analytical results are partly compared to the result of simulation and experiment with a small difference that proves the reliability of the formula. The proposed results of this paper could assist technicians to select suitable SPIF machine, tools to a given workpiece sheet material machine to avoid out of order when forming sheets by SPIF technolo

Keywords: Single Point incremental Forming (SPIF), normal stresses, strains, simulation, consumption power, analytical formula.

Pages: 12 - 16 | DOI: 10.15224/978-1-63248-090-3-43

4. MODELING OF 12-CYLINDER CAMLESS ENGINE WITH NEURAL NETWORKS

Authors: MOH’D SAMI ASHHAB

Abstract: The 12-cyliner camless engine breathing process will be modeled with artificial neural networks (ANN's). The inputs to the net are the intake valve lift (IVL) and intake valve closing timing (IVC) whereas the output of the net is the cylinder air charge (CAC). In camless engine a control system should be designed to track desired cylinder air charge as demanded by the driver and thus satisfy torque requirement. For efficient engine performance the pumping loss (PL) must be minimized while tracking the cylinder air charge. Towards this end, the pumping loss as a function of the intake valve lift and intake valve closing timing is modeled with the aid of the neural networks. The developed neural net model predicts the cylinder air charge and pumping loss well and can be used for camless engine control design.

Keywords: 12-cylinder camless engine, artificial neural networks, modeling

Pages: 17 - 20 | DOI: 10.15224/978-1-63248-090-3-44

5. DESIGN AND PRODUCTION OF AUTOMATED DENTAL IMPLANT DRILLING TEST SYSTEM

Authors: SAYEDALI MOUSAVI

Abstract: Abstract—In dental implant surgery, drilling is first step to make hole for insertion of fixture. Different implant system has their sequence and drilling system for making the implant site preparation. To determine drilling system performance in vitro examination under constant condition, it needs accurate experimental apparatus to determine drilling system performances. The use of a novel test system to drill the implant site in preparation for the insertion of the implant was developed in this research. Experimental condition of drilling test such as feed rate, vertical force, RPM, drill forward and backward and temperature should monitor in designed system. The system’s software, which consists of robot calibration module, drill plan module, load plan module, drill execution module, and acquisition data module, is programmed based C# software GUI system for test monitoring. The experimental result showed that all implants were precisely placed at the right location and Positioning

Keywords: Design, Production, Automated, Dental, Implant Drilling, Test System

Pages: 26 - 29 | DOI: 10.15224/978-1-63248-090-3-46

6. EVALUATION OF THERMAL PERFORMANCE PARAMETERS AND REPRESENTATION OF EFFICIENCY CURVES IN SOLAR AIR HEATERS.

Authors: B.N. PRASAD , LALJEE PRASAD , RAVI KUMAR

Abstract: Flat plate solar collectors of water heating and air heating types have been widely studied for variety of utilizations. Water heaters are mostly of water recirculation types, their thermal efficiency curves are represented with the conventional equations and methods. However, for solar air heaters, mostly being without recycling of air and which performance is very much mass flow rate dependent, the conventional equations and methods for evaluating and representing their performance become not so valid and useful. This papers represents and discusses the way of evaluation of performance of solar air heater of conventional and novel types together with the nature of performance curves obtained thereof

Keywords: Thermal efficiency, performance parameters, plate efficiency factor, collector heat removal factor, fluid inlet and outlet temperature.

Pages: 30 - 35 | DOI: 10.15224/978-1-63248-090-3-47

7. SOLVENT BASED SLURRY FUNCTIONAL GRADED THERMAL BARRIER COATING FOR APPLICATION IN AUTOMOTIVE TURBOCHARGER TURBINE VOLUTE CASING

Authors: ALIAS MOHD NOOR , UDAY M. BASHEER , MUHAMMAD RABIU ABBAS

Abstract: Tremendous amount of heat is being lost at the turbine area of an automotive turbocharger during its operation. Application of ceramic thermal barrier coating to components operating under severe temperature condition such as automotive turbocharger turbine volute casing can reduce the heat lost to the environment, improve the efficiency and reliability of components and extend their service life. But high cost of installation and maintenance, complexity and spallation problem due to thermal expansion mismatch between the ceramic and the metal substrate have seriously restricted the acceptance and widespread practice of ceramic thermal barrier coating. In the present study, a solvent based slurry functionally graded thermal barrier coating technique was employed in depositing different compositions of Yttria stabilized zirconia and nickel powders on a nickel alloy substrate using a simple laboratory-scale surface coating machine. The coating compositions of 25wt% YSZ & 75wt% Ni, 60wt%

Keywords: Automotive turbocharger, Thermal barrier coating, Heat transfer, Slurry

Pages: 36 - 40 | DOI: 10.15224/978-1-63248-090-3-48

8. AN IMPROVED MOBILE TROLLEY FOR SATELLITE TEST FACILITY

Authors: ELENA WOO LAI LENG

Abstract: A mobile trolley is a form of mechanical ground support equipment that allows engineers to perform integration work at various parts of the satellite body in a safe manner, thus preventing mishandling of the satellite. Existing mobile trolleys available in the market have several limitations, whereby its height is not adjustable and typical mobile trolley doesn’t have any mechanism to transport a satellite into the thermal vacuum chamber to undergo environmental test. Therefore, this project was proposed to design and develop a Motorised Adjustable Vertical Platform (MAVeP), an improvement to existing mobile trolleys, which has the ability to move around, to increase or decrease its height and finally, to be able to transport the satellite into the thermal vacuum chamber. The MAVeP is expected to provide assistance in the assembly, integration and testing operation without jeopardizing the safety of the spacecraft.)

Keywords: satellite trolley, satellite testing, mobile platform, mechanical ground support equipment

Pages: 41 - 45 | DOI: 10.15224/978-1-63248-090-3-49

9. ELECTROTHERMALLY AND ELECTROSTATICALLY TUNABLE BRIDGE RESONATORS

Authors: ABDALLAH RAMINI , AMAL Z.HAJJAJ , MD. ABDULLAH HAFIZ , MOHAMMAD I. YOUNIS

Abstract: This paper demonstrates experimentally, theoretically, and numerically, for the first time, a wide-range tunability of an in-plane clamped-clamped microbeam, bridge, resonator actuated electrothermally and electrostatically. Using both actuation methods, we demonstrate that a single resonator can be operated at a wide range of frequencies. The microbeam is actuated electrothermally, by passing a DC current through it, and electrostatically by applying a DC polarization voltage between the microbeam and the stationary electrode. We show that when increasing the electrothermal voltage, the compressive stress inside the microbeam increases, which leads eventually to its buckling. Before buckling, the fundamental frequency decreases until it drops to very low values, almost to zero. After buckling, the fundamental frequency increases, which is shown to be as high as twice the original resonance frequency. Adding a DC bias changes the qualitative nature of the tunability both before and aft

Keywords: tunability, resonator, eletrothermal actuation, electrostatic actuation

Pages: 46 - 53 | DOI: 10.15224/978-1-63248-090-3-67