Papers by Keyword: Nonlinear Transient Analysis

Abstract: Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

Abstract: The butt welding of 45 carbon structural steel has been analyzed using a nonlinear transient finite element (FE) model. With numerical analysis technology, welding heat transfer and thermal elasto-plastictity have been progressed. Also the effects of welding seam growth with heating source movement have been studied using the birth and death technique. For this purpose, a 3-D structural and thermal direct-coupled solution has been used to obtain the temperature changing curves and residual stresses distributions. In addition, the variations of physical properties of material with temperature have been taken into account. Results indicate that the heating speed of welding is rapid, and the distributions of residual stresses are not symmetrical along the welding seam’s centerline, and the residual stresses are change along the welding direction and also in the plate-thickness. It has been shown that use of 3-D direct coupled-field and nonlinear transient model will lead to more accurate and realistic results.