# Blog

## 11 DecImplicit vs Explicit

In an FEA simulation, two different solution methods can be used, implicit or explicit. They both have their benefits and there are types of analyses that are more suited to one or the other. An implicit solver solves the unknowns in the numerical equations by the...

## 04 DecDrop and Impact

A drop test simulation in FEA is modelled as a non-linear transient dynamic analysis (https://fea-solutions.co.uk/non-linear-transient-dynamic-analysis/), as it is a dynamic (https://fea-solutions.co.uk/static-vs-dynamic-analysis/) time dependent (https://fea-solutions.co.uk/transient-analysis/) problem that includes non-linear behaviour (https://fea-solutions.co.uk/non-linear-behaviour/). To model the drop, a ground plane is created to simulate the impact surface, and the...

## 27 NovOptimisation of a Dynamic System

Optimisation of a Dynamic System Improving the strength of a structure subjected to a static load is usually quite straight forward, by adding material to the most highly stressed areas. Improving a structure that is subjected to dynamic loads can however be quite tricky. The difference  between...

## 20 NovDynamic Design Analysis Method (DDAM)

The purpose of a Dynamic Design Analysis Method (DDAM) in FEA is to find a system's response to a shock load without the need for a shock curve (acceleration vs. time graph), using empirical correlations instead. The DDAM is used for the analysis of equipment...

## 17 JulSeismic Analysis

Seismic analysis in FEA is predominantly used in civil engineering to evaluate a building's response to an earthquake and the oscillations from it. The main parameters of the analysis are load carrying capacity, ductility, stiffness, damping and mass. There are 2 common methods of seismic analysis: ...

## 10 JulShock Analysis

Shock analyses are used to evaluate the system response to a load which varies over a very small time, such as an explosion. There are several methods to carry out a Shock Analysis in FEA: Static Analysis (https://fea-solutions.co.uk/static-vs-dynamic-analysis/) Dynamic Design Analysis Method (DDAM) Linear Transient Dynamic...

## 03 JulRandom Vibration Analysis

A Random Vibration Analysis (RVA) is used to calculate the system's structural response to a spectrum of random excitations, and non-deterministic loads. Examples of non-deterministic loads include loads generated on a wheel travelling over a rough road, or random structural vibrations on the airframe of...

## 26 JunNon-Linear Transient Dynamic Analysis

A non-linear transient dynamic analysis allows the simulation of time dependant problems whilst considering any or all of the three types of non-linearities: material non-linearity, geometric non-linearity and constraint non-linearity. For more information on non-linear behaviour, please visit: (https://fea-solutions.co.uk/non-linear-behaviour/). If the relative effects of inertia, damping...

## 19 JunLinear Transient Dynamic Analysis

A linear transient dynamic analysis is performed if the variation of the load is very fast or, in other words, the period (https://fea-solutions.co.uk/frequency-and-period/) of the load variation is shorter than the first natural frequency (https://fea-solutions.co.uk/modal-analysis/) of the structure (https://fea-solutions.co.uk/static-vs-dynamic-analysis/), but if non-linear effects (https://fea-solutions.co.uk/non-linear-behaviour/) don't...

## 12 JunQuasi-Static Transient Analysis

A quasi-static transient analysis is performed if the load changes with time, but if this change is slow compared to the period (https://fea-solutions.co.uk/frequency-and-period/) of the first natural frequency (https://fea-solutions.co.uk/modal-analysis/) of the structure (https://fea-solutions.co.uk/static-vs-dynamic-analysis/). An example where a quasi-static transient analysis is appropriate would be stresses due...