Blog posts

Random response analysis is a linear approach, while most real life random vibrations involve nonlinear components. It is challenge to analyze a nonlinear system subjected to random vibration. This paper presents an Abaqus FEA approach on the fatigue life calculation of an automobile assembly with rubber isolators subjected to random vibration. Random loading is categorized using Power Spectral Density (PSD). An equivalent dynamic analysis or a random response analysis was used to obtain the maximum stress level and location from random vibration.

Consumers demand smaller electronics devices with more features and capabilities. Making devices smaller provides challenges to engineers to maintain the acoustic performances as enclosed acoustic volume sizes are reduced. This paper discusses the requirements for coupled

structural-acoustic simulation and demonstrates the application of this technology to cell-phone

CAE applications in dealing with multiphysics problems have been drawing much attention in product development in recent years. In particular, structure-fluid interaction (FSI) problems are of major concern. In this article, a numerical simulation on air squeeze-film damping which is important in MEMS design is presented. The study employs Abaqus and STAR-CD to perform a structure-fluid co-simulation. The squeeze-film damping phenomenon of a simple plate structure is demonstrated and its mechanism investigated.

In the UK, conventional fossil fired plant is operated flexibly, some has now operated in

For high strength carbon fiber reinforced polymers, the design criteria are often specified by the compression strength of the composite materials component. This is due to the fact that the compression strength of unidirectional composites is as low as 50 to 60 percent of the tensile strength. One important compressive failure mode in composite is kink-band formation which for a great deal is governed by the waviness of the fibers and the yielding properties of the matrix material.

Analysis methodologies developed for evaluating three threaded and coupled connectors quantitatively are presented. Two new non-dimensional parameters for assessing the seal leakage and load shoulder separation are introduced for the purpose. Stress Amplification Factor (SAF), defined in API Specification 16R, is scrutinized for what type of stress is to be used and which reference point the alternating stress is measured from. As a result of it, loading sequence Mean Tension with Two Alternating Moments (MT2AM) is proposed for SAF calculation.

The production of hydrocarbons from deepwater reservoirs requires the fabrication and installation of massive infrastructure. As the global energy industry targets hydrocarbon reservoirs in ever deeper water, the use of remote subsea wells to access the reserves and deepwater flowlines to transport the produced hydrocarbons back to floating production platforms will increase.

Since its introduction in the 1960s, coiled tubing (CT) has evolved from smaller sizes and a few cleanout jobs to larger diameters and heavier grades with higher flow rates. Some of the limiting factors, especially on offshore platforms, are limited crane-weight capability and poor weather conditions, which severely limit the size of the reel that can be lifted. With offshore crane capabilities as low as eight tons on some platforms, a CT reel is often transported in two or more sections, requiring offshore assembly.

Offshore containers are exposed to the movement caused by wind, ocean currents, and unpredictable weather conditions so a good structural resistance is required for them. A dynamic analysis has been developed using Abaqus/Explicit to study the structural response of a horizontal pressure vessel mounted in Floating Production Storage and Offloading (FPSO) topsides in the Gulf of Mexico (GOM) coast. The model includes fluid behavior of crude oil inside the container for which the linear Us-Up Hugoniot equation of state is used. The viscosity of the oil was varied according to temperature.

Solar trackers are being increasingly used within the industry in order to improve the amount of power produced by photovoltaic systems. The design of these devices must pay special attention to wind action as the most relevant load seen by the generally flexible structure supporting the panels. However, standard building codes may not be particularly suitable for  this sort of very flexible, extremely wind-exposed and not very critical-from-a-safety-point-of-view structures.