Harsha Kumarasinghe

The inertia forces of a dynamic system could be treated as body forces in a static system in the revised direction. With those body forces, the dynamic system could be analysed as a static one, i.e., under equilibrium conditions. The software means to analyse these static systems using finite element method (FEM) and if the adequate constrains are not given the set of linear equations relating force (moments) and displacements (linear, angular) at nodes of the system will result in many… Show more

The inertia forces of a dynamic system could be treated as body forces in a static system in the revised direction. With those body forces, the dynamic system could be analysed as a static one, i.e., under equilibrium conditions. The software means to analyse these static systems using finite element method (FEM) and if the adequate constrains are not given the set of linear equations relating force (moments) and displacements (linear, angular) at nodes of the system will result in many solution conditions for displacements, and most of the software will not give results. A dynamic system, when converted to static with revised inertia forces, will essentially be a system with inadequate constrains. Therefore in this paper, the concept of virtual supports is introduced to overcome this problem, and an example is given to elaborate how the concept of virtual supports and revised inertia force has been used to analyse a simple dynamic system by using the software “abaqus” meant to analyse static systems. Also with this approach balancing and vibration phenomena of the dynamic system could be inferred. Show less

When the safety of a three wheeler is considered its stability is a vital issue. Topping or tendency for toppling is the major cause behind the accidents of the three-wheeler. Although many studies have been carried out analyzing the relation among speed, turning angle and /or radius of turning, the influence of rate of change of turning radius (or steering angle) has not been seriously taken into account. This paper introduces a finite element analysis based analytical approach which shows the… Show more

When the safety of a three wheeler is considered its stability is a vital issue. Topping or tendency for toppling is the major cause behind the accidents of the three-wheeler. Although many studies have been carried out analyzing the relation among speed, turning angle and /or radius of turning, the influence of rate of change of turning radius (or steering angle) has not been seriously taken into account. This paper introduces a finite element analysis based analytical approach which shows the relation between toppling and rate of change of steering angle. With this result it could be inferred that steering wheel type turning mechanism in rather safer than handle type. Show less

stress strain analysis of a brick mortar structure is rather complicated,mainly due to anisotropic and composite nature.
in this method a homogeneity nature of the brick-mortar system is identified at micro level and the averaged anisotropic properties of the representative micro level units are used to analyse the structure with a software.

In general a mathematical analysis of a structure for its displacement and stress-strain with loads cannot be carried out if adequate coordinates of fixed points in the structure required to define all the points of the structure are not given. Such structures may be named as floating structures and in practice these appear very often. These are very much observed in ancient buildings. The concept of virtual supports provides a method to analyze such structures without influencing its original… Show more

In general a mathematical analysis of a structure for its displacement and stress-strain with loads cannot be carried out if adequate coordinates of fixed points in the structure required to define all the points of the structure are not given. Such structures may be named as floating structures and in practice these appear very often. These are very much observed in ancient buildings. The concept of virtual supports provides a method to analyze such structures without influencing its original stress-strain conditions. Show less