Finite Element Method pre and post processing tool FAST and a self-programmed software optim3.f are used for structural optimization analysis for main parts of a railway locomotive support vehicle. For best structure optimization, a program code which has considered 3D structure optimization was added to original program to automatically erase nodes whose effective stress was smaller than a given value. Detailed analysis are undertaken to main causes of stress concentration, and using optimized design methods, effective measure for reforming stress concentration and a new structure were proposed.

Existence of back tempered regions in laser hardened materials is a common industrial problem. As a result of back tempering, the areas have lower hardness compared to hardened areas, becoming a potential breakage starting point. In this research Laser hardening is applied to AISI 1060 work piece to analyze relationship between laser beam parameters and back tempered region. Analytical model for thermal cycle similar to experimental condition is built and results from experiment and modeling are compared.

It is based on the monitoring result a motor of 1600KW start of petro-chemical oil refinery in Urumqi , the paper probe and analyze that high-capacity motor’s start exercise bad influence over the power quality of circuit: voltage sag and harmonics current, and take some improving actions based on its features.