A screw propeller consists of a number of blades attached to a hub fitted to the propeller shaft. Rake is the bend angle of blade generating line with the normal to the propeller hub. In the development of screw propulsion, the cantilever beam method has been the instrument of stress calculation in marine propeller blade. This method evaluates the stress at the point of maximum thickness on a reference blade section by means of estimating stress component due to thrust-torque action and centrifugal force-bending. This paper deals with the study of effect of propeller rake on development of stress in blade due to rotation action using finite element method.
The main objective of this analysis is to investigate the stresses& deflections Drive shaft subjected to combined bending & torsion. Then checking for fatigue life, comparing the results with mathematical calculations to verify the accuracy of results. Drive shaft is a critical component used in process automation machine. It carries a load of two vacuum rollers weighing around 1470N and rotates at 3000 rpm. This shaft has key slots and stress raisers at the area of change in cross sections giving rise to localized stress concentration. Hence there is a scope of analyzing this part to predict its failure during functioning due to cyclic loading, Same results are compared by analyzing shaft using SolidWorks Simulation software. High stress zone is determined and suitable profile modification is done to keep the stresses uniform across the shaft geometry. Fatigue study is carried out Life and Fatigue factor of safety is calculated and same results are compared with hand calculations.
Anurag Kashid, Shailesh S. Kadre, Vipin K. Tripathi
To remain competitive in market, mileage is one of the most appealing specifications. Also improving fuel efficiency helps decreasing carbon footprint, which in turn helps in reducing global warming. For this purpose reducing weight of vehicle is very effective way. Objective of this study is to generate initial sampling plan and to do crash analysis at those points. Crash analysis is done to obtain data of internal energies and accelerations at centre of gravity to further generate surrogate model to reduce the mass of car model. These quantities are constraints for the reduction of mass because crash worthiness is the most important aspect of vehicle testing. Surrogate models are response surfaces which are constructed using results in some initial analysis. In this study HyperWorks and LsDyna software are used for crash analysis.
Pravin N. Jawarikar, Subim N. Khan, Shrikant A. Borkar, Amarsinh A. Shinde
Disc brakes rotor design is varied for rotors of the same intended use for many companies and some still use the same initial rotor designs that were introduced over a decade ago. This investigation is done by modelling and finite element analysis of the existing brake disc rotor models available in market. The stress level, deformation and temperature variation at specified load conditions is analyze and studied. In one of the model Bajaj Pulsar 150 of rear wheel the scope for design optimization is found where the stress level can be reduced at high stress area. The topology optimization technique is used to find the design solutions. The outer diameter & inner mounting position of holes on wheel hub is considered as the constraints for design. The goal was to design a rotor with minimum stress level and that maintains similar structural performance as rotors that are currently commercially available. The optimal solution out of modified rotor designs was compared to existing rotor. The optimise stress, deformation of the modified disc brake rotor is achieved with good heat dissipation.
Original Equipment Manufacturers are keen on developing a commercially viable mass reduction strategy for mainstream vehicles. They are focused on clean transportation with use of lightweight materials and efficient design and demonstrated substantial mass savings. Lighter vehicles are cleaner and more efficient. Lightweight architectures and efficient performance are just two core competencies. In automotive dashboard cross car beam is heavy part which carries all weight of dashboard so by reducing weight of cross car beam we can reduce overall weight of the dashboard. Weight reduction can be achieved by reducing size, redesign, reduce Content and selecting alternative lightweight material which can fulfill all performance.
Router is a tool used to remove an area or material from the face of a relatively hard work piece, particularly from wood or plastic, especially the main application of wood routers is in woodworking machinery. In this attempt, Design includes application of scientific principles, technical information and sometimes assumptions for development of new or may be improvised machine or mechanism to perform a particular function with maximum economy and efficiency. This attempt involves the study of hand-arm vibration (HAV) due to the use of hand held tools and comparative analysis of passive & active fluid dampers for a router mechanism to overcome the defects of vibration. HAV is a vibration transmitted from a work processes to the workers’ hands, arms and shoulders. This can be caused by operating hand-held tools, hand-guided equipment, or by holding materials continuously processed by machines.
This paper includes a detailed study of optimization of IC engine piston for weight reduction. A piston is one of the most important components in internal combustion engine. It is important from weight point of view, as it includes inertia forces. It also contributes to the total weight of engine. Therefore the objective of this project is to minimize the weight of piston of internal combustion engine. In this work, there are two steps of design optimization of the piston, Design and Analysis. At First, design the piston model with given design specification on the modeling software CATIA V5R19. The boundary conditions are then applied on the piston after importing the piston model in IGES format into the analysis software ANSYS. Then analysis of different parameters (stress and deformation) is done and easily the results are obtained. In this work, piston is optimized for weight by removing the material of the piston.
Application of cutting fluids changes the performance of machining operations because of their lubrication, cooling, and chip flushing functions. But the conventional cutting fluids are not that effective in such high production machining, particularly in continuous cutting of materials likes steels. So Nano fluids have novel properties that make them potentially useful in heat transfer medium in cutting zone And Minimum quantity lubrication (MQL) presents itself as a viable alternative for turning with respect to tool wear, heat dissipation, and machined surface quality. This study compares the mechanical performance of MQL Vegetable oil & MQL Nanoluids for the turning of EN353 based on experimental measurement of cutting temperature, cutting forces, surface finish, and dimensional deviations. This study prepares the effect of MQL and Nano fluids with 3% volume Al2O3 on the machinability characteristics of EN353 mainly with respect to Surface Roughness and Temperature dissipation. Experimental analysis for two different conditions MQL + oil and MQL + Al2O3 Nanoparticles was carried out.
Weight minimization of existing components is critical for the automobile industry today because of oil and steel prices. Powerful engineering software packages and computers have also made the optimization of components a rapid and inexpensive process. The Maruti Suzuki Alto is an entry level car. The lower control arm of the Macpherson suspension connects the lower steering pivot to the chassis and takes braking, acceleration and cornering loads. Preliminary studies had indicated that the component was overdesigned and that significant weight savings could be achieved. Hence the component was modelled in CATIA using the wireframe and surface module. The model was imported into Hypermesh for meshing. Finally, Optistruct was used to carry out Static Analysis. Some sections of the front lower arm had very low stresses. Weight optimization was performed. Results and conclusions are discussed.