Informatics Publishing Limited

G. Srinivasan ¹, A. M. Junaid Bashaa ¹, M. Senthil Kumar ², K. Anbudurai ³

Affiliations
1 Combat Vehicles Research and Development Establishment, Defence Research and Development Organization, Avadi, Chennai, IN
2 Dept. of Mechanical Engineering, PSG College of Technology, Coimbatore, IN
3 VELS University, Pallavaram, Chennai-600117, Tamilnadu, IN

Abstract

High-speed tracked vehicles traversing off-road terrains are subjected to ride vibrations of low frequency and large amplitude. This causes bodily discomfort to the operator and limits the mobility and performance of the vehicle. The damping of the terrain vibrations is achieved by a Hydro-Gas Suspension Unit (HGSU) with inbuilt damper and hydraulic actuator piston mechanism. The present studies have been carried out to develop a quarter-car dynamic model of passive and active suspensions for improving the HGSU characteristics using proportional integral derivative controller. Performance of the active suspension system has been compared with the passive suspension system through simulations using MATLAB/SIMULINK software.

Keywords

Mathematical Model, Hydro Gas Suspension, Tracked Vehicles, Simulation, Proportional Integral Derivative Controller, Simulink.

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S. Nagesh ¹, A. M. Junaid Bashaa ¹, S. Abilash ²

Affiliations
1 Combat Vehicles Research and Development Establishment, Avadi, Chennai, IN
2 Vel Tech Dr.RR & Dr.SR Technical University, Avadi, Chennai, IN

Abstract

A lightweight High Speed Flexible Coupling (HSFC) is used to connect the engine gear box (EGB) with an accessory gear box (AGB) for fighter aircrafts. The HSFC transmits the power at high speeds ranging from 10000 to 18000 rpm from the EGB to AGB. The HSFC also accommodates larger angular and axial misalignments resulting from differential thermal expansion of the aircraft engine and mounting arrangement. The HSFC utilizes series of metallic contoured annular thin flexible plates. These flexible plates are susceptible to fatigue failures in the presence of minuscule surface defects. The present work describes the analysis carried out on a typical HSFC with incipient flaw for various kinds of imposed misalignments. Based on the sensitivity study of the flaw on the stress levels, a Fatigue Crack Growth Arrestor (FCGA) is designed. In order to contain the crack propagation, drilling a hole at the tip of the crack on the flexible plate as a FCGA is adapted. The fatigue life of the flexible plates is improved by finding appropriate size and location of FCGA through finite element analysis and simulations.

Keywords

Flexible Plates, Fatigue Life, Finite Element Analysis, Fatigue Analysis, Transmission Systems.

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