The effect of different operational loading scenarios on predicted crack growth direction for a propagating inclined railhead is assessed by 2D finite element simulations. Studied load include moving Hertzian contact load, temperature drop, rail bending due to passing wheelset, and combinations thereof. the unbiased propagation using an accumulative vector tip displacement criterion. numerical ...

Wheel wear is a natural phenomenon of wheel–rail rolling contact during vehicle operation. The non-uniform in lateral and circumferential directions normally occurred on wheels. will lead to the unexpected hollow which can cause flange vibration at low-frequency band, result vertical originate from polygon phenomenon. These two forms are coupled each other wheels affect dynamic behaviours syste...

General preventive maintenance model for the components of a system, which improves the reliability to ‘as good as new,’ was used to optimize the maintenance cost. The cost function of a maintenance policy was minimized under given availability constraint. On the other hand, in order to ensure appropriate reliability and availability, the development of the optimal maintenanc...

the telecom services have been recognized the world-over as an important tool for socioeconomic development for a nation and hence telecom infrastructure is treated as a crucial factor to realize the socio-economic objectives in india. accordingly, the department of telecom has been formulating developmental policies for the accelerated growth of the telecommunication services.  bsnl is a wholl...

the paper presents a multi-factor decision-making approach for prioritizing failure modes as an alternative to traditional approach of failure mode and effect analysis (fmea). the approach is based on the ‘technique for order preference by similarity to ideal solution’ (topsis). the priority ranking is formulated on the basis of six parameters (failure occurrence, non-detection, maintainability...

this paper discusses the performance evaluation and availability analysis of ammonia synthesis unit of a fertilizer plant. the fertilizer plant is a complex and repairable engineering system comprises of various units viz. shell gasification and carbon recovery, desulphurization, co-shift conversion, decarbonation, nitrogen wash and ammonia synthesis etc. one of the most important functionaries...

obesity is one of the health threatening problems and the second preventable mortality factor, the prevalence of which is increasing. the economic burden of obesity is estimated at 2-7% of the total healthcare costs and it is predicted to be top health problem of the world in 2025. therefore, following up obesity and developing effective clinical interventions is a significant measure taken in ...