the premature breakage in some four cylinder diesel engine crankshafts was reported. all crankshafts were failed from the same region. failures had occurred in the first crankpin, the nearest crankpin to the flywheel. dynamic analysis and finite element modelling were carried out to determine the state of stress in the crankshaft. fem results revealed that the first crankpin fillet is the most ...

To choose the most suitable method to solve process parameter optimization of ultrasonic rolling extrusion, 42CrMo material was taken as research object. Based on a four-factor five-level orthogonal experiment, response surface used establish prediction models roughness, residual stress, and work hardening degree. obtain better Pareto front, resulting in distribution convergence solution set, s...

Abstract Variable gauge rolling is a new process to obtain plate for which the thickness changes continuously by and dynamically adjusting roll gap upward downward in process. This technology an effective method producing lightweight, low-cost, economical plates. However, variable unsteady process, force deformation parameters are complex. In this research, based on minimum energy theory of var...

Modern railway rolling stock should meet requirements regarding comfort (maximum travel speed with minimum vibrations of wagons, noiselessness movement, etc.). To eliminate the influence dynamic loads, is equipped vibration dampers. The objective work to select parameters dampers stock, depending on its characteristics, ensure due indicators and safety transportation passengers goods by rail. a...

In this work the effects of controlled rolling parameters and adding of Niobium have been studied. In this order two steel grades with and without Niobium are planed and after steelmaking and continuous casting, rolling process are done. Then, laboratory investigations such as microstructure, mechanical properties and grain size analysis were performed Tensile and Charpy impact tests specimens ...

Vibration signals resulting from rolling element bearing defects, present a rich content of physical information, the appropriate analysis of which can lead to the clear identification of the nature of the fault. This paper proposes a method for processing of signals resulting from rolling element bearing defects, based on the use of a shifted wavelet filter family. Using a time-frequency repre...