Results Combination methods are used in dynamic analyses, such as Response Spectrum Analysis (RSA) (https://fea-solutions.co.uk/response-spectrum-analysis/), in order to combine results from multiple analyses of a structure to find the overall response of the system. These multiple analyses are from the excitations of the various modes...
Response Spectrum Analysis (RSA) is used to calculate a system's structural response to short, transient dynamic events, for example earthquakes. RSA is also used for DDAM shock analyses (https://fea-solutions.co.uk/ddam/). RSA is a type of restart analysis as it uses modal superposition to calculate the system's response,...
Harmonic Response Analysis is a linear dynamic analysis used to determine the response of a system to excitation at specific frequencies. It is also referred to as Frequency Response Analysis. The prerequisite for a Harmonic Response Analysis is a Modal Analysis, as the input frequencies needed...
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Springs and Dampers are used in mechanical systems for different reasons. While springs are used to return an assembly to its initial position once it has been displaced, dampers are used to reduce the amplitude of oscillations. Springs are introduced to reduce the displacement due to...
In Kinematics, which is the study of motion, there are three key characteristics of any system which describe how this system moves. These are Displacement, Velocity and Acceleration, and they are all vector quantities related to one another. The displacement of an object is how far...
When performing a Modal Analysis (https://fea-solutions.co.uk/modal-analysis/), one of the results is the modal mass associated to each natural frequency. It is a measure to judge the significance of a vibration mode, or, in simple terms, how damaging might the deformation of a particular natural frequency...
All linear dynamic analyses https://fea-solutions.co.uk/types-of-dynamic-analyses/ except Modal Analysis https://fea-solutions.co.uk/modal-analysis/ use modal superposition. This is a mathematical procedure to use results from a Modal Analysis to calculate the effects of dynamic loads on a structure. In simple terms, modal superposition applies loads to the natural frequencies calculated earlier....
Dynamic analyses, rather than static analyses, have to be performed if the load is not constant over time https://fea-solutions.co.uk/static-vs-dynamic-analysis/. In the real world, most loads are variable, but nevertheless their effects are simulated by static analyses. For the decision to be made as to whether a dynamic...
Resonance describes the phenomena of amplification that occurs when the frequency of a periodically applied load is very similar or equal to one of the system's natural frequencies. When the required frequency for resonance is met by the external load, the system it is applied...