| || Optimisation of Kinematics for Tracked Vehicle Hydro Gas Suspension System
Author : Sridhar, S.;Sekar, N. S.
Source : Defence Science Journal ; Vol:56(5) ; 2006 ; pp 743-752
Subject : 623.4 Armaments and Ballistics;620.261 Explosives
Keywords : Optimisation;Kinematics;Hydro gas suspension;Tracked vehicle;Cross-country mobility;Single slider crank mechanism;Kinematic linkages
Abstract : The modern-day armoured fighting vehicles (AFVs) are basically tracked vehicles equipped with hydro gas suspensions, in lieu of conventional mechanical suspensions like torsion bar and coil spring bogie suspensions. The uniqueness of hydro gas suspension is that it offers a nonlinear spring rate, which is very much required for the cross-country moveability of a tracked vehicle. The AFVs have to negotiate different cross-country terrains like sandy, rocky, riverbed, etc. and the road irregularities provide enumerable problems during dynamic loadings to the design of hydro gas suspension system. Optimising various design parameters demands innovative design methodologies to achieve better ride performance. Hence, a comprehensive kinematic analysis is needed. In this study, a methodology has been derived to optimise the kinematics of the suspension by reorienting the cylinder axis and optimising the load-transferring leverage factor so that the side thrust on the cylinder is minimised to a greater extent. The optimisation ultimately increases the life of the high-pressure and high-temperature piston seals, resulting in enhanced system life for better dependability.
| || Design Optimisation of Parachute Sequencer Mechanism
Author : Kulkarni, C.M.
Source : Defence Science Journal ; Vol:42(1) ; 1992 ; pp 23-28
Subject : 629.7 Aeronautics
Keywords : Kinematic linkages;Shock loads
Abstract : Attempt has been made to ascertain the behaviour of complex system of parachute sequencer mechanism by discretisation. Parachute sequencer mechanism consists of different kinematic linkages which are subjected to shock loads, imposed by parachute deploying at very high velocities. Dynamic properties of various linkages have been studied by establishing equations. The effects of modifying various parameters have been discussed. A computer programme has also been written to study the effects of the changes in variables to arrive at optimum solution. The method followed and the findings are enumerated.