Advances in mechanical engineering

Mechanical engineering is the discipline that applies the principles of engineering, physics, and materials science for the design, analysis, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves the design, production, and operation of machinery. This text is divided into seven chapters. First chapter begins with introduction to analysis of gas turbine blade vibration due to random excitation. The objective of this analysis is to accruable determine the critical speeds and the vibration response below the trip speed. Second chapter reports the failure investigation of a rotating axial flow fan of the Iran Montazer-Ghaem-VI 123 MW capacity generator unit. The purpose of third chapter is to apply probabilistic fracture mechanics to the analysis of the influence of Remedial Actions on structural reliability. Fourth chapter aims to introduce the concept of fracture mechanics and numerical approaches to solve interacting cracks problems in solid bodies which involves elastic crack interaction. The elastic interaction is a result of changes in stress field distribution as the applied force is given during remote loading. Fifth chapter start with a brief discussion on evaluating the integrity of pressure pipelines by fracture mechanics. Sixth chapter offers some techniques to modify the LSM criterion to significantly improve approximation results. Last chapter contains a description on foundations of measurement fractal theory for the fracture mechanic.