Applied Mechanics and Materials Vols. 592-594

Abstract: Fighter aircraft wings are the leading lift generating components for any aerospace vehicle. The recital of any flying vehicle largely depends on its wing design. Missiles and the fighter aircrafts which are having propulsion system mostly have fins to control and maneuver. In this present paper work an attempt has been made to design a fighter aircraft wing configuration which will be used in some air launched air to surface guided weapons fighter aircraft. The main focus of this paper agreement in determining the Sweep-back effects on fighter aircraft wing under transonic condition at different angles of attack (AoA) from 0 to 5 degrees. For this the fighter aircraft wing performance for various flow conditions and sweep angles are obtained based on the empirical, semi-empirical and CFD simulation results. Hence by studying these computational results would help in the optimizing geometry for better performance, an finest wing design for the air launched air to surface body with conservative wing can be obtained.

Abstract: This paper focuses on the analysis and controlling automotive vibration using semi-active air spring suspension system by implementing fuzzy and Proportional-Integral derivative (PID) controllers for light vehicles. Due to low transmissibility coefficients and their ability to varying the force generated depends on load capacities the air spring is modelled as an actuator. The dynamic behavior of semi active actuator controlled is contrasted with passive suspension under single bump, double bump and random road profile. The performance of air spring controlled suspension has been investigated. Results show that the fuzzy controller gives optimized results.

Abstract: This paper mainly comprises of design and fabrication of torque value check by using pneumatics as a base concept. The machines which detect the play of the wheel end which is placed in the steering column for converting the rotational motion to angular motion of the tyres. The torque meter which displays the play of the wheel end through a digital output. Since the customers prefer their own specification there is a chance of misplacement in the batch production. The steering column manufacturing unit faces a serious crisis. In order to overcome this Japanese technique called Poka Yoke (error proof) has been infused with this design. The Programmable Logical Circuits (PLC) controlled unit which plays the vital role in the sequencing the pneumatic cylinders according to operations planned. The sensors placed in the proper orientation helps the worker to detect the error in the work piece. With this an additional printer device is installed which automatically prints the label code for the product. The sensor allows the operator to paste the label in the correct position. If the label is positioned in the wrong place the led emits red light to glow or the green light glows which indicates the part is correct.

Abstract: Gear pumps are the most efficient positive displacement pumps that are being used in very high precision metering application and also with the cost of production of these pumps almost cut by a 25% to the conventional pumps, the external gear pumps have been a clear choice for the dispensing application in various industries. The design and modelling the concepts have been formulated using SOLIDWORKS modelling software and pump is aimed at delivering 20 bar of high fructose sugar syrup which will yield the required volume flow rate. Available technology was utilized in the design and fabrication of the external gear pump.[1] The design considerations and the relevant theories will affect the performance of the pump. The major factor in the pump being the nozzles that are being changed and what are the critical areas have validated using ABAQUS software.

Abstract: In the present work, the dynamic deflection of a cantilever beam subjected to moving mass has been investigated theoretically and numerically. The mass is moved by an external force. The effects of mass magnitude and the speed of the moving mass on the response of the beam structure have been investigated. Using continuum mechanics the differential equation for the systems have been developed and solved by fourth order Runge-Kutta method with different boundary conditions. Numerical analysis has been carried out with different examples to describe the response of the beam structure.

Abstract: Tailor welded blank (TWB) is an advancement in the field of sheet metal forming in which multiple blanks are welded together to create a single blank prior to forming process. Springback behaviour of TWBs in bending is complex due to thickness or material combination. In this research, the effect of punch profile radius on the springback of transversely welded strips has been investigated in V-bending operation with included bend angle of 90° and using punches with three different punch profile radii of 7.5, 10and 12.5 mm. TWBs were prepared by laser welding of interstitial-free steel blanks with a thickness combination of 0.6 and 1.2mm. The Tensile properties of parent materials and tailored blanks were evaluated by Tension test as per ASTM-E8M standard. The bend samples with transverse weld line were prepared to a size of 20X150mm to ensure plane strain bending. Finite element (FE) simulations were performed using Abaqus and were found to be in good agreement with the experimental results.

Abstract: This paper quantifies the effect of ovality and thinning/thickening of thin-wall pipe bend modeled using the geometric parameters of r/t=15 and 20 and λ=0.1 to 0.3. For each model the ovality and thinning is varied from 5% to 20 % in steps of 5 % .The collapse loads were obtained from twice-elastic-slope method of pipe bends subjected to out-of-plane moment with and without internal pressure. Large displacement analysis was performed on elastic-perfectly plastic material using the nonlinear FE package of ABAQUS. The analyzed shows that the thinning effect is insignificant and ovality produce the significant effect of upto 27.7% decrease in collapse load for pipe bend subjected to combined moment and internal pressure.

Abstract: In recent years, sandwich structures have been considered as viable engineering constructions. The use of composite structures in aerospace and civil structural applications have been increasing especially due to their extremely low weight that leads to reduction in the total weight , high flexural and corrosion resistance in addition to higher transverse shear stiffness. Various combinations of core and face sheet thickness have been evaluated by many researchers worldwide. This study evaluates the aspects of putting the face sheets and core together through stitching and studies the effects and effectiveness of stitching. This paper mainly deals with design of fixture used to stitching sandwich panels, which helps to stitch different file orientations such as 90⁰, 45⁰, 90⁰/45⁰/90⁰ and 90⁰/45⁰. Keywords: Sandwich Panels, Composite Materials, Design of Fixture, Stitching panels, and Stitched Foam Structure

Abstract: Wind power is a major source of sustainable energy and can be harvested using both horizontal and vertical axis wind turbines. Vertical axis wind turbines (VAWTs) accrue more popularity due to its self-starting characteristics and Omni directional in nature. Out of which Savonius rotor is the most popular drag-based VAWT which is having lower efficiencies but having good self-starting characteristics. In order to improve the performance, helix in the tip of the blade is targeted which reduces the negative torque coefficient of the rotor thereby could improve the performance of the rotor. Therefore, in this paper the power coefficients of a two-bucket helical Savonius rotor at different overlap ratios (from 0.0% to 19.76%) with helix twist angle of 20° are investigated experimentally. The investigations mainly concentrate to find out the optimum overlap ratio which is responsible for generation of maximum aerodynamic power. It is seen from the results that the power coefficient of the rotor increases with the increase in overlap ratio up to a certain limit, and further increase of the same decreases the power coefficients. The maximum power coefficient C_p of 0.289 is obtained at an optimum overlap ratio of 12.76 %.

Abstract: Increasing competition and innovation in automobile sector tends to modify the existing products or replace old products by new and advanced material products. A suspension system of vehicle is also an area where these innovations are carried out regularly. Now days the automobile Industry has shown much interest in using Fiber Reinforced Plastic (FRP) components replacing conventional steel components due to its “high strength to low weight” ratio. Therefore replacement the steel open coil suspension springs (in heavy automobiles) with Glass Fiber Reinforced Plastic (GFRP) open coil springs with the main aim to reduce its weight and thereby reduce the fuel consumption to some extent. A semi mechanized pultrusion process (E –Glass and Epoxy Resin) and braiding process is selected for fabricating the GFRP open coil springs. It is then tested in lab to study some of the variable parameters. Keywords: Fiber reinforced plastic (FRP) , Coil spring , Pultrusion