Informatics Publishing Limited

Ritu Jacob Boby ¹, E. Raj Kumar ¹

Affiliations
1 School of Mechanical Engineering (SMEC), Department of Design and Automation, VIT University, Vellore, Tamil Nadu, IN

Abstract

Background/Objective: This paper focuses on the designing and analysis of a gear system for a turboshaft aero engine reduction gearbox considering various operational, safety and economic parameters involved. Methods/Statistical Analysis: Design for the gear system is made in conformance to International Standards. Various design parameters including stresses developed in the system is determined theoretically and experimentally. Gear blank is later optimised and results validated through finite element analysis. Findings: Contact and bending stresses obtained through finite element method for altered gear blank is found to be in acceptance with theoretical value calculated in accordance with standards for high speed gear systems. Influence of pinball region of contact is also determined. This specifically aids in validation of finite element results with that obtained through theoretical calculations for gear blank related optimisation requirements. Application/Improvements: Instead of concentrating on one or two specific stages of design, the process of designing case specific gearing can be improvised by utilising finite element methods at more design stages.

Keywords

FEA, Gear Design, Gear Optimization, High Speed Gears, Solid Modelling.

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E. Raj Kumar ¹

Affiliations
1 Department of Design and Automation, School of mechanical Engineering (SMEC), VIT University, Vellore - 632014, Tamil Nadu, IN

Abstract

Background/Objectives: The main objective of this paper is dealt with the application of virtual reality in side clamp fixture assembly. Methods/Statistical Analysis: The proposed methodology utilized the geometry and assembly details of side clamp assembly and makes the fixture assembly as close as possible to the real one. It includes two stages. The first stage demonstrates the procedure used for creating virtual prototype of an assembly and the second stage includes the creation of virtual fixture assembly. Findings: VRML coding is used to simulate virtual assembly process. Based on interference analysis errors can be rectified. Fixture assembly planning in virtual environment gives better understanding of the design engineer and the virtual assembly planning gives clear detail for virtual manufacturing. It enables intuitive assembly sequences which are then evaluated by Vizard inspector module. Application/Improvement: In this paper fixture assembly sequences are simulated using VIZARD software. Future research will investigate the fixture assembly plan in a complex virtual manufacturing environment.

Keywords

Computer Aided Fixture Design, Side Clamp Assembly, Virtual Assembly, Virtual Reality.

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B. Thomson Manoj ¹, E. Raj Kumar ¹

Affiliations
1 SMEC, VIT University, Vellore, IN

Abstract

Background/Objectives: To reduce the production cost by implementing Design for casting instead of machining a component. Methods/Statistical Analysis: A machined component is analysed for its strength to failure. Using casting allowable, the same component is re-analysed and verified for feasibility. The design is compromised without making changes at the interfaces so that the installation is simple. Finally the weight is compared to conclude the application of appropriate production method for cost effectiveness. CATIA V5R21 software is used for designing and PATRAN/NASTRAN is used to analyse the components. Findings: Based on the analysis results critical portions are identified and further changes have been made based on casting design without disturbing the critical portions of the components. The redesigned casting model is analysed to monitor further changes and to find effective method of manufacturing. Application/ Improvement: In this paper, analyses have been made for conventional model and casting design model using PATRAN/ NASTRAN software. Further research will show the effective method to manufacture Aero Engine components.

Keywords

Aero Engine Components, Latch Access Door, Pressure Relief Door.

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