News/Expertise

Modelling is an act of reality conceptualization. It is thus directly related to a simplification process where one applies a theory with limited validity to a physical realization. A good model should be the simplest and most representative idealization of the system under study. A trade-off is then at play… Read more: Quality modelling hints: simplification pitfalls with preloaded modal analysis. The case of pressure application for brake squeal

Undertaking vibration analysis, it is very common to characterize a system by its modes of vibration, realizing a modal analysis. In linear dynamics, the response can indeed be expressed into a series of decoupled modal contributions greatly simplifying the analysis. Experimental correlation is best done by comparing modes. High level… Read more: Mode tracking and pole clustering

In the series of our posts concerning model quality and connections, constraints regularization or penalization is a common topic. For contact-based coupling, these transformations introduce a gap/pressure relationship that often has a significant effect on the model behavior, statics and dynamics, that must be controlled. ➀ We will first discuss… Read more: When connection flexibility becomes sensitive

How to properly manage connections to shells in 3D models ? Many mechanical systems use thin structures such as stamped metal sheets for components. This is the case for example in car bodies. Costs for mass production are low, weight is contained, with a good design revision flexibility. Modelling such… Read more: Connections to shells in 3D models

How to verify that the connections in a mechanical assembly behave as intended? The increase of computational power allows considering very large and complex assemblies. The use of connection features, as discussed in our previous post Coupling for mechanical assemblies is widespread, with many available definition and input strategies. As… Read more: Model verification for quality assessment – Assembly checks

How do you handle simplified connections in a Finite Element model with control on accuracy ? Modern simulation capabilities allow considering very large finite element models, including mechanical assemblies. They require interaction models between components, that can be seen as interface connections (junctions, fasteners, contact support…). A major challenge is… Read more: Coupling for mechanical assemblies

Model verification can be a tedious task. Delving into the nitty-gritty details of finite element models of ever-growing size and complexity is seldom valued. This is especially true when the simulation already runs. It is, however, the first step to avoid the so-called Garbage In/Garbage Out shortfalls. This first post… Read more: Model verification for quality assessment – Mesh level

Flange support around fasteners is a commonly overlooked topic in industrial structural dynamics applications. It is due to implementation complexity and the difficulty of finding relevant values for input parameters. It is however a very sensitive aspect that can prevent from validating a model when ignored. We frequently need to… Read more: Solutions for flange contact modelling in structural dynamics