Centre de ressources SIMULIA

This technology brief illustrates typical mode-based noise, vibration, and harshness (NVH) analyses of a full automobile model using the Abaqus product suite. Abaqus/AMS, the automatic multi-level substructuring eigensolver, is used to compute the eigensolution. A steady-state dynamic analysis is then performed in Abaqus/Standard. The significant performance benefit of using Abaqus/AMS and the SIMbased linear dynamics architecture will be demonstrated for uncoupled structural and coupled structural-acoustic analyses.

Solution Briefs

Abaqus/Explicit offers a sophisticated coupled EulerianLagrangian (CEL) technique that can be used to simulate dynamic gas flow in the airbag. The flow-based CEL method offers a more realistic prediction of airbag shape and pressure distribution during all stages of deployment.

Solution Briefs

In this Technology Brief, a co-simulation approach using Abaqus and Dymola is used to achieve a realistic systemlevel simulation of an ABS. The tire, wheel, brake caliper mechanism, and road are simulated with a detailed Abaqus finite element model while the brake system control algorithm and hydraulics and are simulated with Dymola.

Solution Briefs

The Vernay VernaFlo flow controls are custom-designed fluid flow management devices used in a wide range of applications and systems where consistent, reliable operation is essential. Elastomeric rubber components in these devices deform under the influence of upstream variations in fluid pressure. These deformations adjust the orifice diameter and help maintain a constant downstream flow rate. In this Technology Brief the performance of a custom VernaFlo device is evaluated using the fully coupled fluid-structure interaction solution provided by the Abaqus co-simulation capability. The effects of cavitation on the flow are considered. The computational results compare favorably to available experimental data.

Solution Briefs

Total knee replacement gives proven good results for isolated patello-femoral osteoarthritis, but patello-femoral arthroplasty may be more appropriate because only the joint compartment is replaced. Although the femoral component of a patello-femoral prosthesis is smaller than in total knee arthroplasty, it is unknown whether strain-adaptive periprosthetic bone remodeling occurs following patello-femoral arthroplasty. The aim of the study was to evaluate and compare the stress shielding effect of prosthetic replacement with Finite Element modeling.

Customer Papers

A methodology to study friction-induced squeal in a complete automotive disc brake assembly is presented. The analysis process uses a nonlinear static simulation sequence followed by a complex eigenvalue extraction to determine the dynamic instabilities that are manifested as unwanted noise. The effects of assembly loads; nonuniform contact pressure between the brake linings and disc; velocity-, temperature-, and pressure-dependent friction coefficients; friction-induced damping; and lining wear can be included. The methodology is demonstrated with a representative disc brake assembly. Good correlation between the analysis results and available experimental data is achieved.

Solution Briefs

A methodology to study the sound radiation of engine valve covers is presented. The analysis process uses a nonlinear static simulation followed by a steady state dynamics simulation to determine the sound pressure field due to the vibration of the engine cover. The effects of assembly loads are included. The methodology is demonstrated with two representative engine valve covers using acoustic finite and/or infinite element methods. Good correlation between the analysis results and available experimental data is achieved.

Solution Briefs

Critical flaw size was estimated using the Extended Finite Element Method (XFEM) capabilities in the general purpose finite element program ABAQUS. Results suggest that the pressure loads were not high enough to initiate a crack or propagate cracks within the critical defect size limits of the breech for pressure loads currently used in test and evaluation. The results are consistent with the 150+ successful shots that have been completed and the 1000+ shots completed on a similar breech with similar pressure taps.

Customer Papers

In this Technology Brief, the use of Abaqus in the investigation of the collapse of the I-35W bridge is outlined.

Solution Briefs

In this Technology Brief we present some results from simulations performed on a model of a human head [4]. The distributions of electrical potentials and currents within the model are calculated for known source locations in the brain. The electrical conductivity in the model is considered to be inhomogeneous as well as anisotropic.

Solution Briefs

In this Technology Brief, we describe a methodology for modeling the crushing behavior of composite structures using Abaqus/Explicit. Very good quantitative and qualitative agreement between the numerical results and experimental data is shown, demonstrating the utility of Abaqus/ Explicit for assessing the crashworthiness of composite structures and reducing the amount of costly experimental testing.

Solution Briefs

In this technology brief two related but distinct analyses are examined. First, the shock response of an example structure due to a shock event is considered. Second, the steady-state acoustic field established due to machineryinduced vibrations within and around the structure is estimated.

Solution Briefs