Applied Mechanics and Materials Vols. 110-116

Abstract: — The electronic structure of hexagonal WO₃ and triclinic CuWO₄ nanocrystals, prospective materials for renewable energy production and functional devices, has been studied using the X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES) methods. The present XPS and XES results render that the W 5d-and O 2p-like states contribute throughout the whole valence-band region of the h-WO₃ and CuWO₄ nanocrystalline materialls, however maximum contributions of the O 2p-like states occur in the upper, whilst the W 5d-like states in the lower portions of the valence band, respectively.

Abstract: In recent decades, appearance of micro grid and prodigious achievement of smart grid comparing with conventional power plants has been offered. In this paper a smart grid that consists of diesel engine generator, electrolyzer, ultra capacitor and solar cell, is offered and with some load disturbances and switching off in diesel generator is analyzed. The proposed smart grid has two produced energy; electrical energy and hydrogen gaseous. Using PI controllers as concrete controllers is suggested for frequency control. The implementations of frequency control in suggested smart grid are both a function that is called frequency deviation function and proportional and integral gains in controller.

Abstract: Rapid tooling technology is regarded as an important approach of reducing the cost and time to market for new products. Silicone rubber mold is frequently employed in the indirect tooling. Based on green manufacturing, a green silicone rubber mold fabrication process is developed and implemented in this work. This method provided a new, simple and green manufacturing to produce silicone runner mold. The advantages of this method include high yields of the mold fabrication, reducing the cost in the mold fabrication and environmentally conscious manufacturing. The saving in the cost of silicone rubber mold fabrication is up to 35.66 %.

Abstract: This paper introduces the composing and the principle of hydraulic control system of Sealant-spreading machine _ a specific machine for insulating-glass made. It analyzes the matters of the hydraulic system that often appear on operation, and implements the methods of improvement to hydraulic oil, hydraulic valves, etc hydraulic system and its control circuit system. The improved methods not only reduce the production cost, but also improve the equipment operation stability. Practice shows that these schemes are effective and feasible.The improvement of hydraulic control system not only fulfils the technology demand of Sealant-spreading Machine, but also stabilizes the performance much more.

Abstract: In the present turbulent times, survival and success of any organization increasingly depends on effective use of resources available in any organization. The present study has been carried out to assess the utilization of new technologies in the manufacturing organization. A feasibility study has been carried out to find out the utilization level of different technologies for strategic success. The study has been conducted by considering the following aspects:- Utilization of different operations with respect to time. Utilization of machines by comparing the costs of automatic machines with conventional machines. It has been observed that the utilization level of all the sections is more than 70% with respect to time. The research has been carried out using flexible systems methodology. SAP-LAP (Situation Actor Process-Learning Action Performance) is a holistic framework that blends hard systems and soft systems paradigms. For this reason, the enterprises aim for improving the utilization level of existing resources.

Abstract: In order to be economically viable and competitive, the current trends in designing very light jet aircraft have shown that it is essential to improve the aircraft performance and operational flexibility goal, nevertheless have an efficient cost. The application of unconventional configuration has attracted the designer to achieve that goal. This paper discusses the prospective design of unconventional arrangement which will be applied for very light jet aircraft. The existing of a very light jet configurations is reviewed. New concepts of unconventional configuration for this type of aircraft are discussed. The three-surface configuration is then proposed for the design project. The configuration offers stability and unobstructed cabin. With the appropriate design, the additional weight and interference drag due to the extra surface can be reduced. The new design of aircraft configuration and cabin are discussed. High Speed Natural Laminar Flow airfoil is applied to obtain High Lift/Drag Wing design. The weight and aircraft performances are then estimated. The predicted aircraft performance has satisfied the design requirements and objectives. The design process covered by this paper is only concentrate on initial design. The data from this paper can be continuing in future for the next step of design.

Abstract: The effect of thermal radiation on unsteady magnetohydrodynamic free convection flow of an optically thin gray gas past an infinite inclined plate with constant temperature has been investigated. The governing coupled partial differential equations are solved analytically using the Laplace transform technique. The dimensionless velocity and temperature profiles are shown in graphs and the numerical values of the non-dimensional skin-friction and Nusselt number are presented in tables. The influence of the system parameters such asPrandtl number, inclination angle, magnetic field parameter, Grashof number, radiation parameter and time on flow fields have been discussed in detail. The results indicate that the inclination angle, magnetic field parameter and radiation parameter effects were to decrease the fluid velocity along an inclined plate.

Abstract: Biodiesel is an alternative fuels for diesel engine with the blending process by chemically combination of vegetable or animal oil and diesel fuels. It is proved that the biodiesel can be used without any modification on the compression ignition (CI) engine. In this study, the cooking oil of namely carotene is used to produce the biodiesel blend fuels in various percentages. The biodiesel blend and diesel fuel are evaluated to analyze the engine performances in 4 cylinder inline CI engine. The characteristics of engine performances namely brake power output and brake specific fuel consumption are measured with various loads applied. The fuel properties of biodiesel blend are investigated namely density, dynamics viscosity and kinetic viscosity. The experimental results show that the performance of biodiesel B10 is better than it counterpart namely diesel in terms of brake power output and brake specific fuel consumption (BSFC).

Abstract: Supercavitating vehicle utilizes supercavity to reduce the drag force when travelling underwater. It could achieve a speed higher than 200Kn. The dynamic equations of supercavitating vehicle in the vertical plane were studied and the forces are analyzed in detail in this study. Three possible balanced states and configurations are analyzed. Considering the deviation of mass center during the flight, trajectories of uncontrolled supercavitating flight with these configurations are calculated respectively. Results show that fin position and the deviation of center of mass are main factors that affect the stability of underwater trajectories. The distance between fins and center of mass should be as small as possible.

Abstract: Fused deposition modeling (FDM) has evolved as one of the fastest growing layer manufacturing (LM) technology because of its capability to build even functional plastic parts with geometrical complexity in a reasonable time period. The quality of the production process depends on various process parameters, the most important of them being layer thickness (h), raster angle (θ), orientation (φ), contour width (c) and part raster width (w). In the present study, the influence of these parameters on two process quality parameters, namely, build time and the support material volume are studied on a rotational part modeled on a FDM 200mc machine. A 25 full factorial Design of Experiments (DOE) methodology was employed and the results for build time and support material volume of the 32 experiments were analyzed using Design Expert®. Analysis of variance (ANOVA) was done and based on the ANOVA results the model equation for the two quality parameters in both coded and original factors has been developed. Comments on the results obtained and interaction effects are included at the end of the paper.